File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/media/usb/stk1160/Kconfig b/drivers/media/usb/stk1160/Kconfig
new file mode 100644
index 0000000..95584c1
--- /dev/null
+++ b/drivers/media/usb/stk1160/Kconfig
@@ -0,0 +1,24 @@
+config VIDEO_STK1160_COMMON
+ tristate "STK1160 USB video capture support"
+ depends on VIDEO_DEV && I2C
+
+ ---help---
+ This is a video4linux driver for STK1160 based video capture devices.
+
+ To compile this driver as a module, choose M here: the
+ module will be called stk1160
+
+config VIDEO_STK1160_AC97
+ bool "STK1160 AC97 codec support"
+ depends on VIDEO_STK1160_COMMON && SND
+
+ ---help---
+ Enables AC97 codec support for stk1160 driver.
+
+config VIDEO_STK1160
+ tristate
+ depends on (!VIDEO_STK1160_AC97 || (SND='n') || SND) && VIDEO_STK1160_COMMON
+ default y
+ select VIDEOBUF2_VMALLOC
+ select VIDEO_SAA711X
+ select SND_AC97_CODEC if SND
diff --git a/drivers/media/usb/stk1160/Makefile b/drivers/media/usb/stk1160/Makefile
new file mode 100644
index 0000000..dfe3e90
--- /dev/null
+++ b/drivers/media/usb/stk1160/Makefile
@@ -0,0 +1,11 @@
+obj-stk1160-ac97-$(CONFIG_VIDEO_STK1160_AC97) := stk1160-ac97.o
+
+stk1160-y := stk1160-core.o \
+ stk1160-v4l.o \
+ stk1160-video.o \
+ stk1160-i2c.o \
+ $(obj-stk1160-ac97-y)
+
+obj-$(CONFIG_VIDEO_STK1160) += stk1160.o
+
+ccflags-y += -Idrivers/media/i2c
diff --git a/drivers/media/usb/stk1160/stk1160-ac97.c b/drivers/media/usb/stk1160/stk1160-ac97.c
new file mode 100644
index 0000000..2dd308f
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-ac97.c
@@ -0,0 +1,150 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static struct snd_ac97 *stk1160_ac97;
+
+static void stk1160_write_ac97(struct snd_ac97 *ac97, u16 reg, u16 value)
+{
+ struct stk1160 *dev = ac97->private_data;
+
+ /* Set codec register address */
+ stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+ /* Set codec command */
+ stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff);
+ stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8);
+
+ /*
+ * Set command write bit to initiate write operation.
+ * The bit will be cleared when transfer is done.
+ */
+ stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
+}
+
+static u16 stk1160_read_ac97(struct snd_ac97 *ac97, u16 reg)
+{
+ struct stk1160 *dev = ac97->private_data;
+ u8 vall = 0;
+ u8 valh = 0;
+
+ /* Set codec register address */
+ stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+ /*
+ * Set command read bit to initiate read operation.
+ * The bit will be cleared when transfer is done.
+ */
+ stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b);
+
+ /* Retrieve register value */
+ stk1160_read_reg(dev, STK1160_AC97_CMD, &vall);
+ stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh);
+
+ return (valh << 8) | vall;
+}
+
+static void stk1160_reset_ac97(struct snd_ac97 *ac97)
+{
+ struct stk1160 *dev = ac97->private_data;
+ /* Two-step reset AC97 interface and hardware codec */
+ stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94);
+ stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x88);
+
+ /* Set 16-bit audio data and choose L&R channel*/
+ stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01);
+}
+
+static struct snd_ac97_bus_ops stk1160_ac97_ops = {
+ .read = stk1160_read_ac97,
+ .write = stk1160_write_ac97,
+ .reset = stk1160_reset_ac97,
+};
+
+int stk1160_ac97_register(struct stk1160 *dev)
+{
+ struct snd_card *card = NULL;
+ struct snd_ac97_bus *ac97_bus;
+ struct snd_ac97_template ac97_template;
+ int rc;
+
+ /*
+ * Just want a card to access ac96 controls,
+ * the actual capture interface will be handled by snd-usb-audio
+ */
+ rc = snd_card_new(dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, 0, &card);
+ if (rc < 0)
+ return rc;
+
+ /* TODO: I'm not sure where should I get these names :-( */
+ snprintf(card->shortname, sizeof(card->shortname),
+ "stk1160-mixer");
+ snprintf(card->longname, sizeof(card->longname),
+ "stk1160 ac97 codec mixer control");
+ strlcpy(card->driver, dev->dev->driver->name, sizeof(card->driver));
+
+ rc = snd_ac97_bus(card, 0, &stk1160_ac97_ops, NULL, &ac97_bus);
+ if (rc)
+ goto err;
+
+ /* We must set private_data before calling snd_ac97_mixer */
+ memset(&ac97_template, 0, sizeof(ac97_template));
+ ac97_template.private_data = dev;
+ ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
+ rc = snd_ac97_mixer(ac97_bus, &ac97_template, &stk1160_ac97);
+ if (rc)
+ goto err;
+
+ dev->snd_card = card;
+ rc = snd_card_register(card);
+ if (rc)
+ goto err;
+
+ return 0;
+
+err:
+ dev->snd_card = NULL;
+ snd_card_free(card);
+ return rc;
+}
+
+int stk1160_ac97_unregister(struct stk1160 *dev)
+{
+ struct snd_card *card = dev->snd_card;
+
+ /*
+ * We need to check usb_device,
+ * because ac97 release attempts to communicate with codec
+ */
+ if (card && dev->udev)
+ snd_card_free(card);
+
+ return 0;
+}
diff --git a/drivers/media/usb/stk1160/stk1160-core.c b/drivers/media/usb/stk1160/stk1160-core.c
new file mode 100644
index 0000000..1b6836f
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-core.c
@@ -0,0 +1,442 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * TODO:
+ *
+ * 1. (Try to) detect if we must register ac97 mixer
+ * 2. Support stream at lower speed: lower frame rate or lower frame size.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <media/saa7115.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static unsigned int input;
+module_param(input, int, 0644);
+MODULE_PARM_DESC(input, "Set default input");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ezequiel Garcia");
+MODULE_DESCRIPTION("STK1160 driver");
+
+/* Devices supported by this driver */
+static struct usb_device_id stk1160_id_table[] = {
+ { USB_DEVICE(0x05e1, 0x0408) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, stk1160_id_table);
+
+/* saa7113 I2C address */
+static unsigned short saa7113_addrs[] = {
+ 0x4a >> 1,
+ I2C_CLIENT_END
+};
+
+/*
+ * Read/Write stk registers
+ */
+int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
+{
+ int ret;
+ int pipe = usb_rcvctrlpipe(dev->udev, 0);
+ u8 *buf;
+
+ *value = 0;
+
+ buf = kmalloc(sizeof(u8), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ ret = usb_control_msg(dev->udev, pipe, 0x00,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0x00, reg, buf, sizeof(u8), HZ);
+ if (ret < 0) {
+ stk1160_err("read failed on reg 0x%x (%d)\n",
+ reg, ret);
+ kfree(buf);
+ return ret;
+ }
+
+ *value = *buf;
+ kfree(buf);
+ return 0;
+}
+
+int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
+{
+ int ret;
+ int pipe = usb_sndctrlpipe(dev->udev, 0);
+
+ ret = usb_control_msg(dev->udev, pipe, 0x01,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, reg, NULL, 0, HZ);
+ if (ret < 0) {
+ stk1160_err("write failed on reg 0x%x (%d)\n",
+ reg, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+void stk1160_select_input(struct stk1160 *dev)
+{
+ int route;
+ static const u8 gctrl[] = {
+ 0x98, 0x90, 0x88, 0x80, 0x98
+ };
+
+ if (dev->ctl_input == STK1160_SVIDEO_INPUT)
+ route = SAA7115_SVIDEO3;
+ else
+ route = SAA7115_COMPOSITE0;
+
+ if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
+ route, 0, 0);
+ stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
+ }
+}
+
+/* TODO: We should break this into pieces */
+static void stk1160_reg_reset(struct stk1160 *dev)
+{
+ int i;
+
+ static const struct regval ctl[] = {
+ {STK1160_GCTRL+2, 0x0078},
+
+ {STK1160_RMCTL+1, 0x0000},
+ {STK1160_RMCTL+3, 0x0002},
+
+ {STK1160_PLLSO, 0x0010},
+ {STK1160_PLLSO+1, 0x0000},
+ {STK1160_PLLSO+2, 0x0014},
+ {STK1160_PLLSO+3, 0x000E},
+
+ {STK1160_PLLFD, 0x0046},
+
+ /* Timing generator setup */
+ {STK1160_TIGEN, 0x0012},
+ {STK1160_TICTL, 0x002D},
+ {STK1160_TICTL+1, 0x0001},
+ {STK1160_TICTL+2, 0x0000},
+ {STK1160_TICTL+3, 0x0000},
+ {STK1160_TIGEN, 0x0080},
+
+ {0xffff, 0xffff}
+ };
+
+ for (i = 0; ctl[i].reg != 0xffff; i++)
+ stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
+}
+
+static void stk1160_release(struct v4l2_device *v4l2_dev)
+{
+ struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
+
+ stk1160_dbg("releasing all resources\n");
+
+ stk1160_i2c_unregister(dev);
+
+ v4l2_ctrl_handler_free(&dev->ctrl_handler);
+ v4l2_device_unregister(&dev->v4l2_dev);
+ kfree(dev->alt_max_pkt_size);
+ kfree(dev);
+}
+
+/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
+#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
+
+/*
+ * Scan usb interface and populate max_pkt_size array
+ * with information on each alternate setting.
+ * The array should be allocated by the caller.
+ */
+static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
+ unsigned int *max_pkt_size)
+{
+ int i, e, sizedescr, size, ifnum;
+ const struct usb_endpoint_descriptor *desc;
+
+ bool has_video = false, has_audio = false;
+ const char *speed;
+
+ ifnum = intf->altsetting[0].desc.bInterfaceNumber;
+
+ /* Get endpoints */
+ for (i = 0; i < intf->num_altsetting; i++) {
+
+ for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
+
+ /* This isn't clear enough, at least to me */
+ desc = &intf->altsetting[i].endpoint[e].desc;
+ sizedescr = le16_to_cpu(desc->wMaxPacketSize);
+ size = sizedescr & 0x7ff;
+
+ if (udev->speed == USB_SPEED_HIGH)
+ size = size * hb_mult(sizedescr);
+
+ if (usb_endpoint_xfer_isoc(desc) &&
+ usb_endpoint_dir_in(desc)) {
+ switch (desc->bEndpointAddress) {
+ case STK1160_EP_AUDIO:
+ has_audio = true;
+ break;
+ case STK1160_EP_VIDEO:
+ has_video = true;
+ max_pkt_size[i] = size;
+ break;
+ }
+ }
+ }
+ }
+
+ /* Is this even possible? */
+ if (!(has_audio || has_video)) {
+ dev_err(&udev->dev, "no audio or video endpoints found\n");
+ return -ENODEV;
+ }
+
+ switch (udev->speed) {
+ case USB_SPEED_LOW:
+ speed = "1.5";
+ break;
+ case USB_SPEED_FULL:
+ speed = "12";
+ break;
+ case USB_SPEED_HIGH:
+ speed = "480";
+ break;
+ default:
+ speed = "unknown";
+ }
+
+ dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
+ udev->manufacturer ? udev->manufacturer : "",
+ udev->product ? udev->product : "",
+ speed,
+ le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct),
+ ifnum,
+ intf->altsetting->desc.bInterfaceNumber);
+
+ /* This should never happen, since we rejected audio interfaces */
+ if (has_audio)
+ dev_warn(&udev->dev, "audio interface %d found.\n\
+ This is not implemented by this driver,\
+ you should use snd-usb-audio instead\n", ifnum);
+
+ if (has_video)
+ dev_info(&udev->dev, "video interface %d found\n",
+ ifnum);
+
+ /*
+ * Make sure we have 480 Mbps of bandwidth, otherwise things like
+ * video stream wouldn't likely work, since 12 Mbps is generally
+ * not enough even for most streams.
+ */
+ if (udev->speed != USB_SPEED_HIGH)
+ dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
+ You may not be able to stream video smoothly\n");
+
+ return 0;
+}
+
+static int stk1160_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ int rc = 0;
+
+ unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
+ struct usb_device *udev;
+ struct stk1160 *dev;
+
+ udev = interface_to_usbdev(interface);
+
+ /*
+ * Since usb audio class is supported by snd-usb-audio,
+ * we reject audio interface.
+ */
+ if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
+ return -ENODEV;
+
+ /* Alloc an array for all possible max_pkt_size */
+ alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
+ interface->num_altsetting, GFP_KERNEL);
+ if (alt_max_pkt_size == NULL)
+ return -ENOMEM;
+
+ /*
+ * Scan usb posibilities and populate alt_max_pkt_size array.
+ * Also, check if device speed is fast enough.
+ */
+ rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
+ if (rc < 0) {
+ kfree(alt_max_pkt_size);
+ return rc;
+ }
+
+ dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
+ if (dev == NULL) {
+ kfree(alt_max_pkt_size);
+ return -ENOMEM;
+ }
+
+ dev->alt_max_pkt_size = alt_max_pkt_size;
+ dev->udev = udev;
+ dev->num_alt = interface->num_altsetting;
+ dev->ctl_input = input;
+
+ /* We save struct device for debug purposes only */
+ dev->dev = &interface->dev;
+
+ usb_set_intfdata(interface, dev);
+
+ /* initialize videobuf2 stuff */
+ rc = stk1160_vb2_setup(dev);
+ if (rc < 0)
+ goto free_err;
+
+ /*
+ * There is no need to take any locks here in probe
+ * because we register the device node as the *last* thing.
+ */
+ spin_lock_init(&dev->buf_lock);
+ mutex_init(&dev->v4l_lock);
+ mutex_init(&dev->vb_queue_lock);
+
+ rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
+ if (rc) {
+ stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
+ goto free_err;
+ }
+
+ /*
+ * We obtain a v4l2_dev but defer
+ * registration of video device node as the last thing.
+ * There is no need to set the name if we give a device struct
+ */
+ dev->v4l2_dev.release = stk1160_release;
+ dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
+ rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
+ if (rc) {
+ stk1160_err("v4l2_device_register failed (%d)\n", rc);
+ goto free_ctrl;
+ }
+
+ rc = stk1160_i2c_register(dev);
+ if (rc < 0)
+ goto unreg_v4l2;
+
+ /*
+ * To the best of my knowledge stk1160 boards only have
+ * saa7113, but it doesn't hurt to support them all.
+ */
+ dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
+ "saa7115_auto", 0, saa7113_addrs);
+
+ /* i2c reset saa711x */
+ v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+
+ /* reset stk1160 to default values */
+ stk1160_reg_reset(dev);
+
+ /* select default input */
+ stk1160_select_input(dev);
+
+ stk1160_ac97_register(dev);
+
+ rc = stk1160_video_register(dev);
+ if (rc < 0)
+ goto unreg_i2c;
+
+ return 0;
+
+unreg_i2c:
+ stk1160_i2c_unregister(dev);
+unreg_v4l2:
+ v4l2_device_unregister(&dev->v4l2_dev);
+free_ctrl:
+ v4l2_ctrl_handler_free(&dev->ctrl_handler);
+free_err:
+ kfree(alt_max_pkt_size);
+ kfree(dev);
+
+ return rc;
+}
+
+static void stk1160_disconnect(struct usb_interface *interface)
+{
+ struct stk1160 *dev;
+
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ /*
+ * Wait until all current v4l2 operation are finished
+ * then deallocate resources
+ */
+ mutex_lock(&dev->vb_queue_lock);
+ mutex_lock(&dev->v4l_lock);
+
+ /* Here is the only place where isoc get released */
+ stk1160_uninit_isoc(dev);
+
+ /* ac97 unregister needs to be done before usb_device is cleared */
+ stk1160_ac97_unregister(dev);
+
+ stk1160_clear_queue(dev);
+
+ video_unregister_device(&dev->vdev);
+ v4l2_device_disconnect(&dev->v4l2_dev);
+
+ /* This way current users can detect device is gone */
+ dev->udev = NULL;
+
+ mutex_unlock(&dev->v4l_lock);
+ mutex_unlock(&dev->vb_queue_lock);
+
+ /*
+ * This calls stk1160_release if it's the last reference.
+ * therwise, release is posponed until there are no users left.
+ */
+ v4l2_device_put(&dev->v4l2_dev);
+}
+
+static struct usb_driver stk1160_usb_driver = {
+ .name = "stk1160",
+ .id_table = stk1160_id_table,
+ .probe = stk1160_probe,
+ .disconnect = stk1160_disconnect,
+};
+
+module_usb_driver(stk1160_usb_driver);
diff --git a/drivers/media/usb/stk1160/stk1160-i2c.c b/drivers/media/usb/stk1160/stk1160-i2c.c
new file mode 100644
index 0000000..850cf28
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-i2c.c
@@ -0,0 +1,294 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk_i2c(fmt, args...) \
+do { \
+ if (i2c_debug) \
+ printk(KERN_DEBUG fmt, ##args); \
+} while (0)
+
+static int stk1160_i2c_busy_wait(struct stk1160 *dev, u8 wait_bit_mask)
+{
+ unsigned long end;
+ u8 flag;
+
+ /* Wait until read/write finish bit is set */
+ end = jiffies + msecs_to_jiffies(STK1160_I2C_TIMEOUT);
+ while (time_is_after_jiffies(end)) {
+
+ stk1160_read_reg(dev, STK1160_SICTL+1, &flag);
+ /* read/write done? */
+ if (flag & wait_bit_mask)
+ goto done;
+
+ usleep_range(10 * USEC_PER_MSEC, 20 * USEC_PER_MSEC);
+ }
+
+ return -ETIMEDOUT;
+
+done:
+ return 0;
+}
+
+static int stk1160_i2c_write_reg(struct stk1160 *dev, u8 addr,
+ u8 reg, u8 value)
+{
+ int rc;
+
+ /* Set serial device address */
+ rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+ if (rc < 0)
+ return rc;
+
+ /* Set i2c device register sub-address */
+ rc = stk1160_write_reg(dev, STK1160_SBUSW_WA, reg);
+ if (rc < 0)
+ return rc;
+
+ /* Set i2c device register value */
+ rc = stk1160_write_reg(dev, STK1160_SBUSW_WD, value);
+ if (rc < 0)
+ return rc;
+
+ /* Start write now */
+ rc = stk1160_write_reg(dev, STK1160_SICTL, 0x01);
+ if (rc < 0)
+ return rc;
+
+ rc = stk1160_i2c_busy_wait(dev, 0x04);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
+static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr,
+ u8 reg, u8 *value)
+{
+ int rc;
+
+ /* Set serial device address */
+ rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+ if (rc < 0)
+ return rc;
+
+ /* Set i2c device register sub-address */
+ rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, reg);
+ if (rc < 0)
+ return rc;
+
+ /* Start read now */
+ rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20);
+ if (rc < 0)
+ return rc;
+
+ rc = stk1160_i2c_busy_wait(dev, 0x01);
+ if (rc < 0)
+ return rc;
+
+ rc = stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
+/*
+ * stk1160_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int stk1160_i2c_check_for_device(struct stk1160 *dev,
+ unsigned char addr)
+{
+ int rc;
+
+ /* Set serial device address */
+ rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+ if (rc < 0)
+ return rc;
+
+ /* Set device sub-address, we'll chip version reg */
+ rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, 0x00);
+ if (rc < 0)
+ return rc;
+
+ /* Start read now */
+ rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20);
+ if (rc < 0)
+ return rc;
+
+ rc = stk1160_i2c_busy_wait(dev, 0x01);
+ if (rc < 0)
+ return -ENODEV;
+
+ return 0;
+}
+
+/*
+ * stk1160_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int stk1160_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct stk1160 *dev = i2c_adap->algo_data;
+ int addr, rc, i;
+
+ for (i = 0; i < num; i++) {
+ addr = msgs[i].addr << 1;
+ dprintk_i2c("%s: addr=%x", __func__, addr);
+
+ if (!msgs[i].len) {
+ /* no len: check only for device presence */
+ rc = stk1160_i2c_check_for_device(dev, addr);
+ if (rc < 0) {
+ dprintk_i2c(" no device\n");
+ return rc;
+ }
+
+ } else if (msgs[i].flags & I2C_M_RD) {
+ /* read request without preceding register selection */
+ dprintk_i2c(" subaddr not selected");
+ rc = -EOPNOTSUPP;
+ goto err;
+
+ } else if (i + 1 < num && msgs[i].len <= 2 &&
+ (msgs[i + 1].flags & I2C_M_RD) &&
+ msgs[i].addr == msgs[i + 1].addr) {
+
+ if (msgs[i].len != 1 || msgs[i + 1].len != 1) {
+ dprintk_i2c(" len not supported");
+ rc = -EOPNOTSUPP;
+ goto err;
+ }
+
+ dprintk_i2c(" subaddr=%x", msgs[i].buf[0]);
+
+ rc = stk1160_i2c_read_reg(dev, addr, msgs[i].buf[0],
+ msgs[i + 1].buf);
+
+ dprintk_i2c(" read=%x", *msgs[i + 1].buf);
+
+ /* consumed two msgs, so we skip one of them */
+ i++;
+
+ } else {
+ if (msgs[i].len != 2) {
+ dprintk_i2c(" len not supported");
+ rc = -EOPNOTSUPP;
+ goto err;
+ }
+
+ dprintk_i2c(" subaddr=%x write=%x",
+ msgs[i].buf[0], msgs[i].buf[1]);
+
+ rc = stk1160_i2c_write_reg(dev, addr, msgs[i].buf[0],
+ msgs[i].buf[1]);
+ }
+
+ if (rc < 0)
+ goto err;
+ dprintk_i2c(" OK\n");
+ }
+
+ return num;
+err:
+ dprintk_i2c(" ERROR: %d\n", rc);
+ return num;
+}
+
+/*
+ * functionality(), what da heck is this?
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm algo = {
+ .master_xfer = stk1160_i2c_xfer,
+ .functionality = functionality,
+};
+
+static struct i2c_adapter adap_template = {
+ .owner = THIS_MODULE,
+ .name = "stk1160",
+ .algo = &algo,
+};
+
+static struct i2c_client client_template = {
+ .name = "stk1160 internal",
+};
+
+/*
+ * stk1160_i2c_register()
+ * register i2c bus
+ */
+int stk1160_i2c_register(struct stk1160 *dev)
+{
+ int rc;
+
+ dev->i2c_adap = adap_template;
+ dev->i2c_adap.dev.parent = dev->dev;
+ strcpy(dev->i2c_adap.name, "stk1160");
+ dev->i2c_adap.algo_data = dev;
+
+ i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+
+ rc = i2c_add_adapter(&dev->i2c_adap);
+ if (rc < 0) {
+ stk1160_err("cannot add i2c adapter (%d)\n", rc);
+ return rc;
+ }
+
+ dev->i2c_client = client_template;
+ dev->i2c_client.adapter = &dev->i2c_adap;
+
+ /* Set i2c clock divider device address */
+ stk1160_write_reg(dev, STK1160_SICTL_CD, 0x0f);
+
+ /* ??? */
+ stk1160_write_reg(dev, STK1160_ASIC + 3, 0x00);
+
+ return 0;
+}
+
+/*
+ * stk1160_i2c_unregister()
+ * unregister i2c_bus
+ */
+int stk1160_i2c_unregister(struct stk1160 *dev)
+{
+ i2c_del_adapter(&dev->i2c_adap);
+ return 0;
+}
diff --git a/drivers/media/usb/stk1160/stk1160-reg.h b/drivers/media/usb/stk1160/stk1160-reg.h
new file mode 100644
index 0000000..81ff3a1
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-reg.h
@@ -0,0 +1,127 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* GPIO Control */
+#define STK1160_GCTRL 0x000
+
+/* Remote Wakup Control */
+#define STK1160_RMCTL 0x00c
+
+/*
+ * Decoder Control Register:
+ * This byte controls capture start/stop
+ * with bit #7 (0x?? OR 0x80 to activate).
+ */
+#define STK1160_DCTRL 0x100
+
+/*
+ * Decimation Control Register:
+ * Byte 104: Horizontal Decimation Line Unit Count
+ * Byte 105: Vertical Decimation Line Unit Count
+ * Byte 106: Decimation Control
+ * Bit 0 - Horizontal Decimation Control
+ * 0 Horizontal decimation is disabled.
+ * 1 Horizontal decimation is enabled.
+ * Bit 1 - Decimates Half or More Column
+ * 0 Decimates less than half from original column,
+ * send count unit (0x105) before each unit skipped.
+ * 1 Decimates half or more from original column,
+ * skip count unit (0x105) before each unit sent.
+ * Bit 2 - Vertical Decimation Control
+ * 0 Vertical decimation is disabled.
+ * 1 Vertical decimation is enabled.
+ * Bit 3 - Vertical Greater or Equal to Half
+ * 0 Decimates less than half from original row,
+ * send count unit (0x105) before each unit skipped.
+ * 1 Decimates half or more from original row,
+ * skip count unit (0x105) before each unit sent.
+ * Bit 4 - Decimation Unit
+ * 0 Decimation will work with 2 rows or columns per unit.
+ * 1 Decimation will work with 4 rows or columns per unit.
+ */
+#define STK1160_DMCTRL_H_UNITS 0x104
+#define STK1160_DMCTRL_V_UNITS 0x105
+#define STK1160_DMCTRL 0x106
+#define STK1160_H_DEC_EN BIT(0)
+#define STK1160_H_DEC_MODE BIT(1)
+#define STK1160_V_DEC_EN BIT(2)
+#define STK1160_V_DEC_MODE BIT(3)
+#define STK1160_DEC_UNIT_SIZE BIT(4)
+
+/* Capture Frame Start Position */
+#define STK116_CFSPO 0x110
+#define STK116_CFSPO_STX_L 0x110
+#define STK116_CFSPO_STX_H 0x111
+#define STK116_CFSPO_STY_L 0x112
+#define STK116_CFSPO_STY_H 0x113
+
+/* Capture Frame End Position */
+#define STK116_CFEPO 0x114
+#define STK116_CFEPO_ENX_L 0x114
+#define STK116_CFEPO_ENX_H 0x115
+#define STK116_CFEPO_ENY_L 0x116
+#define STK116_CFEPO_ENY_H 0x117
+
+/* Serial Interface Control */
+#define STK1160_SICTL 0x200
+#define STK1160_SICTL_CD 0x202
+#define STK1160_SICTL_SDA 0x203
+
+/* Serial Bus Write */
+#define STK1160_SBUSW 0x204
+#define STK1160_SBUSW_WA 0x204
+#define STK1160_SBUSW_WD 0x205
+
+/* Serial Bus Read */
+#define STK1160_SBUSR 0x208
+#define STK1160_SBUSR_RA 0x208
+#define STK1160_SBUSR_RD 0x209
+
+/* Alternate Serial Inteface Control */
+#define STK1160_ASIC 0x2fc
+
+/* PLL Select Options */
+#define STK1160_PLLSO 0x018
+
+/* PLL Frequency Divider */
+#define STK1160_PLLFD 0x01c
+
+/* Timing Generator */
+#define STK1160_TIGEN 0x300
+
+/* Timing Control Parameter */
+#define STK1160_TICTL 0x350
+
+/* AC97 Audio Control */
+#define STK1160_AC97CTL_0 0x500
+#define STK1160_AC97CTL_1 0x504
+
+/* Use [0:6] bits of register 0x504 to set codec command address */
+#define STK1160_AC97_ADDR 0x504
+/* Use [16:31] bits of register 0x500 to set codec command data */
+#define STK1160_AC97_CMD 0x502
+
+/* Audio I2S Interface */
+#define STK1160_I2SCTL 0x50c
+
+/* EEPROM Interface */
+#define STK1160_EEPROM_SZ 0x5f0
diff --git a/drivers/media/usb/stk1160/stk1160-v4l.c b/drivers/media/usb/stk1160/stk1160-v4l.c
new file mode 100644
index 0000000..0bd34f1
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-v4l.c
@@ -0,0 +1,855 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-vmalloc.h>
+
+#include <media/saa7115.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static bool keep_buffers;
+module_param(keep_buffers, bool, 0644);
+MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
+
+enum stk1160_decimate_mode {
+ STK1160_DECIMATE_MORE_THAN_HALF,
+ STK1160_DECIMATE_LESS_THAN_HALF,
+};
+
+struct stk1160_decimate_ctrl {
+ bool col_en, row_en;
+ enum stk1160_decimate_mode col_mode, row_mode;
+ unsigned int col_n, row_n;
+};
+
+/* supported video standards */
+static struct stk1160_fmt format[] = {
+ {
+ .name = "16 bpp YUY2, 4:2:2, packed",
+ .fourcc = V4L2_PIX_FMT_UYVY,
+ .depth = 16,
+ }
+};
+
+/*
+ * Helper to find the next divisor that results in modulo being zero.
+ * This is required to guarantee valid decimation unit counts.
+ */
+static unsigned int
+div_round_integer(unsigned int x, unsigned int y)
+{
+ for (;; y++) {
+ if (x % y == 0)
+ return x / y;
+ }
+}
+
+static void stk1160_set_std(struct stk1160 *dev)
+{
+ int i;
+
+ static struct regval std525[] = {
+
+ /* 720x480 */
+
+ /* Frame start */
+ {STK116_CFSPO_STX_L, 0x0000},
+ {STK116_CFSPO_STX_H, 0x0000},
+ {STK116_CFSPO_STY_L, 0x0003},
+ {STK116_CFSPO_STY_H, 0x0000},
+
+ /* Frame end */
+ {STK116_CFEPO_ENX_L, 0x05a0},
+ {STK116_CFEPO_ENX_H, 0x0005},
+ {STK116_CFEPO_ENY_L, 0x00f3},
+ {STK116_CFEPO_ENY_H, 0x0000},
+
+ {0xffff, 0xffff}
+ };
+
+ static struct regval std625[] = {
+
+ /* 720x576 */
+
+ /* TODO: Each line of frame has some junk at the end */
+ /* Frame start */
+ {STK116_CFSPO, 0x0000},
+ {STK116_CFSPO+1, 0x0000},
+ {STK116_CFSPO+2, 0x0001},
+ {STK116_CFSPO+3, 0x0000},
+
+ /* Frame end */
+ {STK116_CFEPO, 0x05a0},
+ {STK116_CFEPO+1, 0x0005},
+ {STK116_CFEPO+2, 0x0121},
+ {STK116_CFEPO+3, 0x0001},
+
+ {0xffff, 0xffff}
+ };
+
+ if (dev->norm & V4L2_STD_525_60) {
+ stk1160_dbg("registers to NTSC like standard\n");
+ for (i = 0; std525[i].reg != 0xffff; i++)
+ stk1160_write_reg(dev, std525[i].reg, std525[i].val);
+ } else {
+ stk1160_dbg("registers to PAL like standard\n");
+ for (i = 0; std625[i].reg != 0xffff; i++)
+ stk1160_write_reg(dev, std625[i].reg, std625[i].val);
+ }
+
+}
+
+static void stk1160_set_fmt(struct stk1160 *dev,
+ struct stk1160_decimate_ctrl *ctrl)
+{
+ u32 val = 0;
+
+ if (ctrl) {
+ /*
+ * Since the format is UYVY, the device must skip or send
+ * a number of rows/columns multiple of four. This way, the
+ * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
+ * does exactly this.
+ */
+ val |= STK1160_DEC_UNIT_SIZE;
+ val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
+ val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
+ val |= ctrl->col_mode ==
+ STK1160_DECIMATE_MORE_THAN_HALF ?
+ STK1160_H_DEC_MODE : 0;
+ val |= ctrl->row_mode ==
+ STK1160_DECIMATE_MORE_THAN_HALF ?
+ STK1160_V_DEC_MODE : 0;
+
+ /* Horizontal count units */
+ stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
+ /* Vertical count units */
+ stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
+
+ stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
+ val, ctrl->col_n, ctrl->row_n);
+ }
+
+ /* Decimation control */
+ stk1160_write_reg(dev, STK1160_DMCTRL, val);
+}
+
+/*
+ * Set a new alternate setting.
+ * Returns true is dev->max_pkt_size has changed, false otherwise.
+ */
+static bool stk1160_set_alternate(struct stk1160 *dev)
+{
+ int i, prev_alt = dev->alt;
+ unsigned int min_pkt_size;
+ bool new_pkt_size;
+
+ /*
+ * If we don't set right alternate,
+ * then we will get a green screen with junk.
+ */
+ min_pkt_size = STK1160_MIN_PKT_SIZE;
+
+ for (i = 0; i < dev->num_alt; i++) {
+ /* stop when the selected alt setting offers enough bandwidth */
+ if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
+ dev->alt = i;
+ break;
+ /*
+ * otherwise make sure that we end up with the maximum bandwidth
+ * because the min_pkt_size equation might be wrong...
+ */
+ } else if (dev->alt_max_pkt_size[i] >
+ dev->alt_max_pkt_size[dev->alt])
+ dev->alt = i;
+ }
+
+ stk1160_dbg("setting alternate %d\n", dev->alt);
+
+ if (dev->alt != prev_alt) {
+ stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
+ min_pkt_size, dev->alt);
+ stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
+ dev->alt, dev->alt_max_pkt_size[dev->alt]);
+ usb_set_interface(dev->udev, 0, dev->alt);
+ }
+
+ new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
+ dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
+
+ return new_pkt_size;
+}
+
+static int stk1160_start_streaming(struct stk1160 *dev)
+{
+ bool new_pkt_size;
+ int rc = 0;
+ int i;
+
+ /* Check device presence */
+ if (!dev->udev)
+ return -ENODEV;
+
+ if (mutex_lock_interruptible(&dev->v4l_lock))
+ return -ERESTARTSYS;
+ /*
+ * For some reason it is mandatory to set alternate *first*
+ * and only *then* initialize isoc urbs.
+ * Someone please explain me why ;)
+ */
+ new_pkt_size = stk1160_set_alternate(dev);
+
+ /*
+ * We (re)allocate isoc urbs if:
+ * there is no allocated isoc urbs, OR
+ * a new dev->max_pkt_size is detected
+ */
+ if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
+ rc = stk1160_alloc_isoc(dev);
+ if (rc < 0)
+ goto out_stop_hw;
+ }
+
+ /* submit urbs and enables IRQ */
+ for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
+ rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
+ if (rc) {
+ stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
+ goto out_uninit;
+ }
+ }
+
+ /* Start saa711x */
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
+
+ dev->sequence = 0;
+
+ /* Start stk1160 */
+ stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
+ stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+ stk1160_dbg("streaming started\n");
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return 0;
+
+out_uninit:
+ stk1160_uninit_isoc(dev);
+out_stop_hw:
+ usb_set_interface(dev->udev, 0, 0);
+ stk1160_clear_queue(dev);
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return rc;
+}
+
+/* Must be called with v4l_lock hold */
+static void stk1160_stop_hw(struct stk1160 *dev)
+{
+ /* If the device is not physically present, there is nothing to do */
+ if (!dev->udev)
+ return;
+
+ /* set alternate 0 */
+ dev->alt = 0;
+ stk1160_dbg("setting alternate %d\n", dev->alt);
+ usb_set_interface(dev->udev, 0, 0);
+
+ /* Stop stk1160 */
+ stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
+ stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+ /* Stop saa711x */
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+}
+
+static int stk1160_stop_streaming(struct stk1160 *dev)
+{
+ if (mutex_lock_interruptible(&dev->v4l_lock))
+ return -ERESTARTSYS;
+
+ /*
+ * Once URBs are cancelled, the URB complete handler
+ * won't be running. This is required to safely release the
+ * current buffer (dev->isoc_ctl.buf).
+ */
+ stk1160_cancel_isoc(dev);
+
+ /*
+ * It is possible to keep buffers around using a module parameter.
+ * This is intended to avoid memory fragmentation.
+ */
+ if (!keep_buffers)
+ stk1160_free_isoc(dev);
+
+ stk1160_stop_hw(dev);
+
+ stk1160_clear_queue(dev);
+
+ stk1160_dbg("streaming stopped\n");
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return 0;
+}
+
+static struct v4l2_file_operations stk1160_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .read = vb2_fop_read,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+/*
+ * vidioc ioctls
+ */
+static int vidioc_querycap(struct file *file,
+ void *priv, struct v4l2_capability *cap)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ strcpy(cap->driver, "stk1160");
+ strcpy(cap->card, "stk1160");
+ usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+ cap->device_caps =
+ V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_STREAMING |
+ V4L2_CAP_READWRITE;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+ return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ if (f->index != 0)
+ return -EINVAL;
+
+ strlcpy(f->description, format[f->index].name, sizeof(f->description));
+ f->pixelformat = format[f->index].fourcc;
+ return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ f->fmt.pix.width = dev->width;
+ f->fmt.pix.height = dev->height;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.bytesperline = dev->width * 2;
+ f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+ return 0;
+}
+
+static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
+ struct stk1160_decimate_ctrl *ctrl)
+{
+ unsigned int width, height;
+ unsigned int base_width, base_height;
+ unsigned int col_n, row_n;
+ enum stk1160_decimate_mode col_mode, row_mode;
+ bool col_en, row_en;
+
+ base_width = 720;
+ base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
+
+ /* Minimum width and height is 5% the frame size */
+ width = clamp_t(unsigned int, f->fmt.pix.width,
+ base_width / 20, base_width);
+ height = clamp_t(unsigned int, f->fmt.pix.height,
+ base_height / 20, base_height);
+
+ /* Let's set default no decimation values */
+ col_n = 0;
+ row_n = 0;
+ col_en = false;
+ row_en = false;
+ f->fmt.pix.width = base_width;
+ f->fmt.pix.height = base_height;
+ row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+ col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+
+ if (width < base_width && width > base_width / 2) {
+ /*
+ * The device will send count units for each
+ * unit skipped. This means count unit is:
+ *
+ * n = width / (frame width - width)
+ *
+ * And the width is:
+ *
+ * width = (n / n + 1) * frame width
+ */
+ col_n = div_round_integer(width, base_width - width);
+ if (col_n > 0 && col_n <= 255) {
+ col_en = true;
+ col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+ f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
+ }
+
+ } else if (width <= base_width / 2) {
+
+ /*
+ * The device will skip count units for each
+ * unit sent. This means count is:
+ *
+ * n = (frame width / width) - 1
+ *
+ * And the width is:
+ *
+ * width = frame width / (n + 1)
+ */
+ col_n = div_round_integer(base_width, width) - 1;
+ if (col_n > 0 && col_n <= 255) {
+ col_en = true;
+ col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
+ f->fmt.pix.width = base_width / (col_n + 1);
+ }
+ }
+
+ if (height < base_height && height > base_height / 2) {
+ row_n = div_round_integer(height, base_height - height);
+ if (row_n > 0 && row_n <= 255) {
+ row_en = true;
+ row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+ f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
+ }
+
+ } else if (height <= base_height / 2) {
+ row_n = div_round_integer(base_height, height) - 1;
+ if (row_n > 0 && row_n <= 255) {
+ row_en = true;
+ row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
+ f->fmt.pix.height = base_height / (row_n + 1);
+ }
+ }
+
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
+ f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+ if (ctrl) {
+ ctrl->col_en = col_en;
+ ctrl->col_n = col_n;
+ ctrl->col_mode = col_mode;
+ ctrl->row_en = row_en;
+ ctrl->row_n = row_n;
+ ctrl->row_mode = row_mode;
+ }
+
+ stk1160_dbg("width %d, height %d\n",
+ f->fmt.pix.width, f->fmt.pix.height);
+ return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ return stk1160_try_fmt(dev, f, NULL);
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+ struct stk1160_decimate_ctrl ctrl;
+ int rc;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ rc = stk1160_try_fmt(dev, f, &ctrl);
+ if (rc < 0)
+ return rc;
+ dev->width = f->fmt.pix.width;
+ dev->height = f->fmt.pix.height;
+ stk1160_set_fmt(dev, &ctrl);
+
+ return 0;
+}
+
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
+ return 0;
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ *norm = dev->norm;
+ return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+
+ if (dev->norm == norm)
+ return 0;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ /* Check device presence */
+ if (!dev->udev)
+ return -ENODEV;
+
+ /* We need to set this now, before we call stk1160_set_std */
+ dev->width = 720;
+ dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
+ dev->norm = norm;
+
+ stk1160_set_std(dev);
+
+ /* Calling with NULL disables frame decimation */
+ stk1160_set_fmt(dev, NULL);
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+ dev->norm);
+
+ return 0;
+}
+
+
+static int vidioc_enum_input(struct file *file, void *priv,
+ struct v4l2_input *i)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ if (i->index > STK1160_MAX_INPUT)
+ return -EINVAL;
+
+ /* S-Video special handling */
+ if (i->index == STK1160_SVIDEO_INPUT)
+ sprintf(i->name, "S-Video");
+ else
+ sprintf(i->name, "Composite%d", i->index);
+
+ i->type = V4L2_INPUT_TYPE_CAMERA;
+ i->std = dev->vdev.tvnorms;
+ return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ *i = dev->ctl_input;
+ return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ if (i > STK1160_MAX_INPUT)
+ return -EINVAL;
+
+ dev->ctl_input = i;
+
+ stk1160_select_input(dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int vidioc_g_register(struct file *file, void *priv,
+ struct v4l2_dbg_register *reg)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ int rc;
+ u8 val;
+
+ /* Match host */
+ rc = stk1160_read_reg(dev, reg->reg, &val);
+ reg->val = val;
+ reg->size = 1;
+
+ return rc;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+ const struct v4l2_dbg_register *reg)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ /* Match host */
+ return stk1160_write_reg(dev, reg->reg, reg->val);
+}
+#endif
+
+static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+ .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
+ .vidioc_querystd = vidioc_querystd,
+ .vidioc_g_std = vidioc_g_std,
+ .vidioc_s_std = vidioc_s_std,
+ .vidioc_enum_input = vidioc_enum_input,
+ .vidioc_g_input = vidioc_g_input,
+ .vidioc_s_input = vidioc_s_input,
+
+ /* vb2 takes care of these */
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+
+ .vidioc_log_status = v4l2_ctrl_log_status,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .vidioc_g_register = vidioc_g_register,
+ .vidioc_s_register = vidioc_s_register,
+#endif
+};
+
+/********************************************************************/
+
+/*
+ * Videobuf2 operations
+ */
+static int queue_setup(struct vb2_queue *vq, const void *parg,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct stk1160 *dev = vb2_get_drv_priv(vq);
+ unsigned long size;
+
+ size = dev->width * dev->height * 2;
+
+ /*
+ * Here we can change the number of buffers being requested.
+ * So, we set a minimum and a maximum like this:
+ */
+ *nbuffers = clamp_t(unsigned int, *nbuffers,
+ STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
+
+ /* This means a packed colorformat */
+ *nplanes = 1;
+
+ sizes[0] = size;
+
+ stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
+ __func__, *nbuffers, size);
+
+ return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ unsigned long flags;
+ struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct stk1160_buffer *buf =
+ container_of(vbuf, struct stk1160_buffer, vb);
+
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ if (!dev->udev) {
+ /*
+ * If the device is disconnected return the buffer to userspace
+ * directly. The next QBUF call will fail with -ENODEV.
+ */
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ } else {
+
+ buf->mem = vb2_plane_vaddr(vb, 0);
+ buf->length = vb2_plane_size(vb, 0);
+ buf->bytesused = 0;
+ buf->pos = 0;
+
+ /*
+ * If buffer length is less from expected then we return
+ * the buffer to userspace directly.
+ */
+ if (buf->length < dev->width * dev->height * 2)
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ else
+ list_add_tail(&buf->list, &dev->avail_bufs);
+
+ }
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+static int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct stk1160 *dev = vb2_get_drv_priv(vq);
+ return stk1160_start_streaming(dev);
+}
+
+/* abort streaming and wait for last buffer */
+static void stop_streaming(struct vb2_queue *vq)
+{
+ struct stk1160 *dev = vb2_get_drv_priv(vq);
+ stk1160_stop_streaming(dev);
+}
+
+static struct vb2_ops stk1160_video_qops = {
+ .queue_setup = queue_setup,
+ .buf_queue = buffer_queue,
+ .start_streaming = start_streaming,
+ .stop_streaming = stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static struct video_device v4l_template = {
+ .name = "stk1160",
+ .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
+ .fops = &stk1160_fops,
+ .ioctl_ops = &stk1160_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+/********************************************************************/
+
+/* Must be called with both v4l_lock and vb_queue_lock hold */
+void stk1160_clear_queue(struct stk1160 *dev)
+{
+ struct stk1160_buffer *buf;
+ unsigned long flags;
+
+ /* Release all active buffers */
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ while (!list_empty(&dev->avail_bufs)) {
+ buf = list_first_entry(&dev->avail_bufs,
+ struct stk1160_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ stk1160_dbg("buffer [%p/%d] aborted\n",
+ buf, buf->vb.vb2_buf.index);
+ }
+
+ /* It's important to release the current buffer */
+ if (dev->isoc_ctl.buf) {
+ buf = dev->isoc_ctl.buf;
+ dev->isoc_ctl.buf = NULL;
+
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ stk1160_dbg("buffer [%p/%d] aborted\n",
+ buf, buf->vb.vb2_buf.index);
+ }
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+int stk1160_vb2_setup(struct stk1160 *dev)
+{
+ int rc;
+ struct vb2_queue *q;
+
+ q = &dev->vb_vidq;
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+ q->drv_priv = dev;
+ q->buf_struct_size = sizeof(struct stk1160_buffer);
+ q->ops = &stk1160_video_qops;
+ q->mem_ops = &vb2_vmalloc_memops;
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+ rc = vb2_queue_init(q);
+ if (rc < 0)
+ return rc;
+
+ /* initialize video dma queue */
+ INIT_LIST_HEAD(&dev->avail_bufs);
+
+ return 0;
+}
+
+int stk1160_video_register(struct stk1160 *dev)
+{
+ int rc;
+
+ /* Initialize video_device with a template structure */
+ dev->vdev = v4l_template;
+ dev->vdev.queue = &dev->vb_vidq;
+
+ /*
+ * Provide mutexes for v4l2 core and for videobuf2 queue.
+ * It will be used to protect *only* v4l2 ioctls.
+ */
+ dev->vdev.lock = &dev->v4l_lock;
+ dev->vdev.queue->lock = &dev->vb_queue_lock;
+
+ /* This will be used to set video_device parent */
+ dev->vdev.v4l2_dev = &dev->v4l2_dev;
+
+ /* NTSC is default */
+ dev->norm = V4L2_STD_NTSC_M;
+ dev->width = 720;
+ dev->height = 480;
+
+ /* set default format */
+ dev->fmt = &format[0];
+ stk1160_set_std(dev);
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+ dev->norm);
+
+ video_set_drvdata(&dev->vdev, dev);
+ rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
+ if (rc < 0) {
+ stk1160_err("video_register_device failed (%d)\n", rc);
+ return rc;
+ }
+
+ v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
+ video_device_node_name(&dev->vdev));
+
+ return 0;
+}
diff --git a/drivers/media/usb/stk1160/stk1160-video.c b/drivers/media/usb/stk1160/stk1160-video.c
new file mode 100644
index 0000000..75654e6
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-video.c
@@ -0,0 +1,539 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/ratelimit.h>
+
+#include "stk1160.h"
+
+static unsigned int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "enable debug messages");
+
+static inline void print_err_status(struct stk1160 *dev,
+ int packet, int status)
+{
+ char *errmsg = "Unknown";
+
+ switch (status) {
+ case -ENOENT:
+ errmsg = "unlinked synchronuously";
+ break;
+ case -ECONNRESET:
+ errmsg = "unlinked asynchronuously";
+ break;
+ case -ENOSR:
+ errmsg = "Buffer error (overrun)";
+ break;
+ case -EPIPE:
+ errmsg = "Stalled (device not responding)";
+ break;
+ case -EOVERFLOW:
+ errmsg = "Babble (bad cable?)";
+ break;
+ case -EPROTO:
+ errmsg = "Bit-stuff error (bad cable?)";
+ break;
+ case -EILSEQ:
+ errmsg = "CRC/Timeout (could be anything)";
+ break;
+ case -ETIME:
+ errmsg = "Device does not respond";
+ break;
+ }
+
+ if (packet < 0)
+ printk_ratelimited(KERN_WARNING "URB status %d [%s].\n",
+ status, errmsg);
+ else
+ printk_ratelimited(KERN_INFO "URB packet %d, status %d [%s].\n",
+ packet, status, errmsg);
+}
+
+static inline
+struct stk1160_buffer *stk1160_next_buffer(struct stk1160 *dev)
+{
+ struct stk1160_buffer *buf = NULL;
+ unsigned long flags = 0;
+
+ /* Current buffer must be NULL when this functions gets called */
+ WARN_ON(dev->isoc_ctl.buf);
+
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ if (!list_empty(&dev->avail_bufs)) {
+ buf = list_first_entry(&dev->avail_bufs,
+ struct stk1160_buffer, list);
+ list_del(&buf->list);
+ }
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+
+ return buf;
+}
+
+static inline
+void stk1160_buffer_done(struct stk1160 *dev)
+{
+ struct stk1160_buffer *buf = dev->isoc_ctl.buf;
+
+ buf->vb.sequence = dev->sequence++;
+ buf->vb.field = V4L2_FIELD_INTERLACED;
+ buf->vb.vb2_buf.planes[0].bytesused = buf->bytesused;
+ v4l2_get_timestamp(&buf->vb.timestamp);
+
+ vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->bytesused);
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+
+ dev->isoc_ctl.buf = NULL;
+}
+
+static inline
+void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len)
+{
+ int linesdone, lineoff, lencopy;
+ int bytesperline = dev->width * 2;
+ struct stk1160_buffer *buf = dev->isoc_ctl.buf;
+ u8 *dst = buf->mem;
+ int remain;
+
+ /*
+ * TODO: These stk1160_dbg are very spammy!
+ * We should 1) check why we are getting them
+ * and 2) add ratelimit.
+ *
+ * UPDATE: One of the reasons (the only one?) for getting these
+ * is incorrect standard (mismatch between expected and configured).
+ * So perhaps, we could add a counter for errors. When the counter
+ * reaches some value, we simply stop streaming.
+ */
+
+ len -= 4;
+ src += 4;
+
+ remain = len;
+
+ linesdone = buf->pos / bytesperline;
+ lineoff = buf->pos % bytesperline; /* offset in current line */
+
+ if (!buf->odd)
+ dst += bytesperline;
+
+ /* Multiply linesdone by two, to take account of the other field */
+ dst += linesdone * bytesperline * 2 + lineoff;
+
+ /* Copy the remaining of current line */
+ if (remain < (bytesperline - lineoff))
+ lencopy = remain;
+ else
+ lencopy = bytesperline - lineoff;
+
+ /*
+ * Check if we have enough space left in the buffer.
+ * In that case, we force loop exit after copy.
+ */
+ if (lencopy > buf->bytesused - buf->length) {
+ lencopy = buf->bytesused - buf->length;
+ remain = lencopy;
+ }
+
+ /* Check if the copy is done */
+ if (lencopy == 0 || remain == 0)
+ return;
+
+ /* Let the bug hunt begin! sanity checks! */
+ if (lencopy < 0) {
+ stk1160_dbg("copy skipped: negative lencopy\n");
+ return;
+ }
+
+ if ((unsigned long)dst + lencopy >
+ (unsigned long)buf->mem + buf->length) {
+ printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n");
+ return;
+ }
+
+ memcpy(dst, src, lencopy);
+
+ buf->bytesused += lencopy;
+ buf->pos += lencopy;
+ remain -= lencopy;
+
+ /* Copy current field line by line, interlacing with the other field */
+ while (remain > 0) {
+
+ dst += lencopy + bytesperline;
+ src += lencopy;
+
+ /* Copy one line at a time */
+ if (remain < bytesperline)
+ lencopy = remain;
+ else
+ lencopy = bytesperline;
+
+ /*
+ * Check if we have enough space left in the buffer.
+ * In that case, we force loop exit after copy.
+ */
+ if (lencopy > buf->bytesused - buf->length) {
+ lencopy = buf->bytesused - buf->length;
+ remain = lencopy;
+ }
+
+ /* Check if the copy is done */
+ if (lencopy == 0 || remain == 0)
+ return;
+
+ if (lencopy < 0) {
+ printk_ratelimited(KERN_WARNING "stk1160: negative lencopy detected\n");
+ return;
+ }
+
+ if ((unsigned long)dst + lencopy >
+ (unsigned long)buf->mem + buf->length) {
+ printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n");
+ return;
+ }
+
+ memcpy(dst, src, lencopy);
+ remain -= lencopy;
+
+ buf->bytesused += lencopy;
+ buf->pos += lencopy;
+ }
+}
+
+/*
+ * Controls the isoc copy of each urb packet
+ */
+static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb)
+{
+ int i, len, status;
+ u8 *p;
+
+ if (!dev) {
+ stk1160_warn("%s called with null device\n", __func__);
+ return;
+ }
+
+ if (urb->status < 0) {
+ /* Print status and drop current packet (or field?) */
+ print_err_status(dev, -1, urb->status);
+ return;
+ }
+
+ for (i = 0; i < urb->number_of_packets; i++) {
+ status = urb->iso_frame_desc[i].status;
+ if (status < 0) {
+ print_err_status(dev, i, status);
+ continue;
+ }
+
+ /* Get packet actual length and pointer to data */
+ p = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+ len = urb->iso_frame_desc[i].actual_length;
+
+ /* Empty packet */
+ if (len <= 4)
+ continue;
+
+ /*
+ * An 8-byte packet sequence means end of field.
+ * So if we don't have any packet, we start receiving one now
+ * and if we do have a packet, then we are done with it.
+ *
+ * These end of field packets are always 0xc0 or 0x80,
+ * but not always 8-byte long so we don't check packet length.
+ */
+ if (p[0] == 0xc0) {
+
+ /*
+ * If first byte is 0xc0 then we received
+ * second field, and frame has ended.
+ */
+ if (dev->isoc_ctl.buf != NULL)
+ stk1160_buffer_done(dev);
+
+ dev->isoc_ctl.buf = stk1160_next_buffer(dev);
+ if (dev->isoc_ctl.buf == NULL)
+ return;
+ }
+
+ /*
+ * If we don't have a buffer here, then it means we
+ * haven't found the start mark sequence.
+ */
+ if (dev->isoc_ctl.buf == NULL)
+ continue;
+
+ if (p[0] == 0xc0 || p[0] == 0x80) {
+
+ /* We set next packet parity and
+ * continue to get next one
+ */
+ dev->isoc_ctl.buf->odd = *p & 0x40;
+ dev->isoc_ctl.buf->pos = 0;
+ continue;
+ }
+
+ stk1160_copy_video(dev, p, len);
+ }
+}
+
+
+/*
+ * IRQ callback, called by URB callback
+ */
+static void stk1160_isoc_irq(struct urb *urb)
+{
+ int i, rc;
+ struct stk1160 *dev = urb->context;
+
+ switch (urb->status) {
+ case 0:
+ break;
+ case -ECONNRESET: /* kill */
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* TODO: check uvc driver: he frees the queue here */
+ return;
+ default:
+ stk1160_err("urb error! status %d\n", urb->status);
+ return;
+ }
+
+ stk1160_process_isoc(dev, urb);
+
+ /* Reset urb buffers */
+ for (i = 0; i < urb->number_of_packets; i++) {
+ urb->iso_frame_desc[i].status = 0;
+ urb->iso_frame_desc[i].actual_length = 0;
+ }
+
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (rc)
+ stk1160_err("urb re-submit failed (%d)\n", rc);
+}
+
+/*
+ * Cancel urbs
+ * This function can't be called in atomic context
+ */
+void stk1160_cancel_isoc(struct stk1160 *dev)
+{
+ int i, num_bufs = dev->isoc_ctl.num_bufs;
+
+ /*
+ * This check is not necessary, but we add it
+ * to avoid a spurious debug message
+ */
+ if (!num_bufs)
+ return;
+
+ stk1160_dbg("killing %d urbs...\n", num_bufs);
+
+ for (i = 0; i < num_bufs; i++) {
+
+ /*
+ * To kill urbs we can't be in atomic context.
+ * We don't care for NULL pointer since
+ * usb_kill_urb allows it.
+ */
+ usb_kill_urb(dev->isoc_ctl.urb[i]);
+ }
+
+ stk1160_dbg("all urbs killed\n");
+}
+
+/*
+ * Releases urb and transfer buffers
+ * Obviusly, associated urb must be killed before releasing it.
+ */
+void stk1160_free_isoc(struct stk1160 *dev)
+{
+ struct urb *urb;
+ int i, num_bufs = dev->isoc_ctl.num_bufs;
+
+ stk1160_dbg("freeing %d urb buffers...\n", num_bufs);
+
+ for (i = 0; i < num_bufs; i++) {
+
+ urb = dev->isoc_ctl.urb[i];
+ if (urb) {
+
+ if (dev->isoc_ctl.transfer_buffer[i]) {
+#ifndef CONFIG_DMA_NONCOHERENT
+ usb_free_coherent(dev->udev,
+ urb->transfer_buffer_length,
+ dev->isoc_ctl.transfer_buffer[i],
+ urb->transfer_dma);
+#else
+ kfree(dev->isoc_ctl.transfer_buffer[i]);
+#endif
+ }
+ usb_free_urb(urb);
+ dev->isoc_ctl.urb[i] = NULL;
+ }
+ dev->isoc_ctl.transfer_buffer[i] = NULL;
+ }
+
+ kfree(dev->isoc_ctl.urb);
+ kfree(dev->isoc_ctl.transfer_buffer);
+
+ dev->isoc_ctl.urb = NULL;
+ dev->isoc_ctl.transfer_buffer = NULL;
+ dev->isoc_ctl.num_bufs = 0;
+
+ stk1160_dbg("all urb buffers freed\n");
+}
+
+/*
+ * Helper for cancelling and freeing urbs
+ * This function can't be called in atomic context
+ */
+void stk1160_uninit_isoc(struct stk1160 *dev)
+{
+ stk1160_cancel_isoc(dev);
+ stk1160_free_isoc(dev);
+}
+
+/*
+ * Allocate URBs
+ */
+int stk1160_alloc_isoc(struct stk1160 *dev)
+{
+ struct urb *urb;
+ int i, j, k, sb_size, max_packets, num_bufs;
+
+ /*
+ * It may be necessary to release isoc here,
+ * since isoc are only released on disconnection.
+ * (see new_pkt_size flag)
+ */
+ if (dev->isoc_ctl.num_bufs)
+ stk1160_uninit_isoc(dev);
+
+ stk1160_dbg("allocating urbs...\n");
+
+ num_bufs = STK1160_NUM_BUFS;
+ max_packets = STK1160_NUM_PACKETS;
+ sb_size = max_packets * dev->max_pkt_size;
+
+ dev->isoc_ctl.buf = NULL;
+ dev->isoc_ctl.max_pkt_size = dev->max_pkt_size;
+ dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
+ if (!dev->isoc_ctl.urb) {
+ stk1160_err("out of memory for urb array\n");
+ return -ENOMEM;
+ }
+
+ dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
+ GFP_KERNEL);
+ if (!dev->isoc_ctl.transfer_buffer) {
+ stk1160_err("out of memory for usb transfers\n");
+ kfree(dev->isoc_ctl.urb);
+ return -ENOMEM;
+ }
+
+ /* allocate urbs and transfer buffers */
+ for (i = 0; i < num_bufs; i++) {
+
+ urb = usb_alloc_urb(max_packets, GFP_KERNEL);
+ if (!urb) {
+ stk1160_err("cannot alloc urb[%d]\n", i);
+ goto free_i_bufs;
+ }
+ dev->isoc_ctl.urb[i] = urb;
+
+#ifndef CONFIG_DMA_NONCOHERENT
+ dev->isoc_ctl.transfer_buffer[i] = usb_alloc_coherent(dev->udev,
+ sb_size, GFP_KERNEL, &urb->transfer_dma);
+#else
+ dev->isoc_ctl.transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
+#endif
+ if (!dev->isoc_ctl.transfer_buffer[i]) {
+ stk1160_err("cannot alloc %d bytes for tx[%d] buffer\n",
+ sb_size, i);
+
+ /* Not enough transfer buffers, so just give up */
+ if (i < STK1160_MIN_BUFS)
+ goto free_i_bufs;
+ goto nomore_tx_bufs;
+ }
+ memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
+
+ /*
+ * FIXME: Where can I get the endpoint?
+ */
+ urb->dev = dev->udev;
+ urb->pipe = usb_rcvisocpipe(dev->udev, STK1160_EP_VIDEO);
+ urb->transfer_buffer = dev->isoc_ctl.transfer_buffer[i];
+ urb->transfer_buffer_length = sb_size;
+ urb->complete = stk1160_isoc_irq;
+ urb->context = dev;
+ urb->interval = 1;
+ urb->start_frame = 0;
+ urb->number_of_packets = max_packets;
+#ifndef CONFIG_DMA_NONCOHERENT
+ urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+#else
+ urb->transfer_flags = URB_ISO_ASAP;
+#endif
+
+ k = 0;
+ for (j = 0; j < max_packets; j++) {
+ urb->iso_frame_desc[j].offset = k;
+ urb->iso_frame_desc[j].length =
+ dev->isoc_ctl.max_pkt_size;
+ k += dev->isoc_ctl.max_pkt_size;
+ }
+ }
+
+ stk1160_dbg("%d urbs allocated\n", num_bufs);
+
+ /* At last we can say we have some buffers */
+ dev->isoc_ctl.num_bufs = num_bufs;
+
+ return 0;
+
+nomore_tx_bufs:
+ /*
+ * Failed to allocate desired buffer count. However, we may have
+ * enough to work fine, so we just free the extra urb,
+ * store the allocated count and keep going, fingers crossed!
+ */
+ usb_free_urb(dev->isoc_ctl.urb[i]);
+ dev->isoc_ctl.urb[i] = NULL;
+
+ stk1160_warn("%d urbs allocated. Trying to continue...\n", i - 1);
+
+ dev->isoc_ctl.num_bufs = i - 1;
+
+ return 0;
+
+free_i_bufs:
+ /* Save the allocated buffers so far, so we can properly free them */
+ dev->isoc_ctl.num_bufs = i+1;
+ stk1160_free_isoc(dev);
+ return -ENOMEM;
+}
+
diff --git a/drivers/media/usb/stk1160/stk1160.h b/drivers/media/usb/stk1160/stk1160.h
new file mode 100644
index 0000000..1ed1cc4
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160.h
@@ -0,0 +1,207 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/i2c.h>
+#include <sound/core.h>
+#include <sound/ac97_codec.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+
+#define STK1160_VERSION "0.9.5"
+#define STK1160_VERSION_NUM 0x000905
+
+/* Decide on number of packets for each buffer */
+#define STK1160_NUM_PACKETS 64
+
+/* Number of buffers for isoc transfers */
+#define STK1160_NUM_BUFS 16
+#define STK1160_MIN_BUFS 1
+
+/* TODO: This endpoint address should be retrieved */
+#define STK1160_EP_VIDEO 0x82
+#define STK1160_EP_AUDIO 0x81
+
+/* Max and min video buffers */
+#define STK1160_MIN_VIDEO_BUFFERS 8
+#define STK1160_MAX_VIDEO_BUFFERS 32
+
+#define STK1160_MIN_PKT_SIZE 3072
+
+#define STK1160_MAX_INPUT 4
+#define STK1160_SVIDEO_INPUT 4
+
+#define STK1160_I2C_TIMEOUT 100
+
+/* TODO: Print helpers
+ * I could use dev_xxx, pr_xxx, v4l2_xxx or printk.
+ * However, there isn't a solid consensus on which
+ * new drivers should use.
+ *
+ */
+#ifdef DEBUG
+#define stk1160_dbg(fmt, args...) \
+ printk(KERN_DEBUG "stk1160: " fmt, ## args)
+#else
+#define stk1160_dbg(fmt, args...)
+#endif
+
+#define stk1160_info(fmt, args...) \
+ pr_info("stk1160: " fmt, ## args)
+
+#define stk1160_warn(fmt, args...) \
+ pr_warn("stk1160: " fmt, ## args)
+
+#define stk1160_err(fmt, args...) \
+ pr_err("stk1160: " fmt, ## args)
+
+/* Buffer for one video frame */
+struct stk1160_buffer {
+ /* common v4l buffer stuff -- must be first */
+ struct vb2_v4l2_buffer vb;
+ struct list_head list;
+
+ void *mem;
+ unsigned int length; /* buffer length */
+ unsigned int bytesused; /* bytes written */
+ int odd; /* current oddity */
+
+ /*
+ * Since we interlace two fields per frame,
+ * this is different from bytesused.
+ */
+ unsigned int pos; /* current pos inside buffer */
+};
+
+struct stk1160_isoc_ctl {
+ /* max packet size of isoc transaction */
+ int max_pkt_size;
+
+ /* number of allocated urbs */
+ int num_bufs;
+
+ /* urb for isoc transfers */
+ struct urb **urb;
+
+ /* transfer buffers for isoc transfer */
+ char **transfer_buffer;
+
+ /* current buffer */
+ struct stk1160_buffer *buf;
+};
+
+struct stk1160_fmt {
+ char *name;
+ u32 fourcc; /* v4l2 format id */
+ int depth;
+};
+
+struct stk1160 {
+ struct v4l2_device v4l2_dev;
+ struct video_device vdev;
+ struct v4l2_ctrl_handler ctrl_handler;
+
+ struct device *dev;
+ struct usb_device *udev;
+
+ /* saa7115 subdev */
+ struct v4l2_subdev *sd_saa7115;
+
+ /* isoc control struct */
+ struct list_head avail_bufs;
+
+ /* video capture */
+ struct vb2_queue vb_vidq;
+
+ /* max packet size of isoc transaction */
+ int max_pkt_size;
+ /* array of wMaxPacketSize */
+ unsigned int *alt_max_pkt_size;
+ /* alternate */
+ int alt;
+ /* Number of alternative settings */
+ int num_alt;
+
+ struct stk1160_isoc_ctl isoc_ctl;
+
+ /* frame properties */
+ int width; /* current frame width */
+ int height; /* current frame height */
+ unsigned int ctl_input; /* selected input */
+ v4l2_std_id norm; /* current norm */
+ struct stk1160_fmt *fmt; /* selected format */
+
+ unsigned int sequence;
+
+ /* i2c i/o */
+ struct i2c_adapter i2c_adap;
+ struct i2c_client i2c_client;
+
+ struct mutex v4l_lock;
+ struct mutex vb_queue_lock;
+ spinlock_t buf_lock;
+
+ struct file *fh_owner; /* filehandle ownership */
+
+ /* EXPERIMENTAL */
+ struct snd_card *snd_card;
+};
+
+struct regval {
+ u16 reg;
+ u16 val;
+};
+
+/* Provided by stk1160-v4l.c */
+int stk1160_vb2_setup(struct stk1160 *dev);
+int stk1160_video_register(struct stk1160 *dev);
+void stk1160_video_unregister(struct stk1160 *dev);
+void stk1160_clear_queue(struct stk1160 *dev);
+
+/* Provided by stk1160-video.c */
+int stk1160_alloc_isoc(struct stk1160 *dev);
+void stk1160_free_isoc(struct stk1160 *dev);
+void stk1160_cancel_isoc(struct stk1160 *dev);
+void stk1160_uninit_isoc(struct stk1160 *dev);
+
+/* Provided by stk1160-i2c.c */
+int stk1160_i2c_register(struct stk1160 *dev);
+int stk1160_i2c_unregister(struct stk1160 *dev);
+
+/* Provided by stk1160-core.c */
+int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value);
+int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value);
+int stk1160_write_regs_req(struct stk1160 *dev, u8 req, u16 reg,
+ char *buf, int len);
+int stk1160_read_reg_req_len(struct stk1160 *dev, u8 req, u16 reg,
+ char *buf, int len);
+void stk1160_select_input(struct stk1160 *dev);
+
+/* Provided by stk1160-ac97.c */
+#ifdef CONFIG_VIDEO_STK1160_AC97
+int stk1160_ac97_register(struct stk1160 *dev);
+int stk1160_ac97_unregister(struct stk1160 *dev);
+#else
+static inline int stk1160_ac97_register(struct stk1160 *dev) { return 0; }
+static inline int stk1160_ac97_unregister(struct stk1160 *dev) { return 0; }
+#endif
+