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/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
new file mode 100644
index 0000000..be91cb5
--- /dev/null
+++ b/drivers/mfd/cs5535-mfd.c
@@ -0,0 +1,192 @@
+/*
+ * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
+ *
+ * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
+ * used for accessing GPIOs, MFGPTs, ACPI, etc. Each subdevice has
+ * an IO range that's specified in a single BAR. The BAR order is
+ * hardcoded in the CS553x specifications.
+ *
+ * Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME "cs5535-mfd"
+
+enum cs5535_mfd_bars {
+ SMB_BAR = 0,
+ GPIO_BAR = 1,
+ MFGPT_BAR = 2,
+ PMS_BAR = 4,
+ ACPI_BAR = 5,
+ NR_BARS,
+};
+
+static int cs5535_mfd_res_enable(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't fetch device resource info\n");
+ return -EIO;
+ }
+
+ if (!request_region(res->start, resource_size(res), DRV_NAME)) {
+ dev_err(&pdev->dev, "can't request region\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int cs5535_mfd_res_disable(struct platform_device *pdev)
+{
+ struct resource *res;
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't fetch device resource info\n");
+ return -EIO;
+ }
+
+ release_region(res->start, resource_size(res));
+ return 0;
+}
+
+static struct resource cs5535_mfd_resources[NR_BARS];
+
+static struct mfd_cell cs5535_mfd_cells[] = {
+ {
+ .id = SMB_BAR,
+ .name = "cs5535-smb",
+ .num_resources = 1,
+ .resources = &cs5535_mfd_resources[SMB_BAR],
+ },
+ {
+ .id = GPIO_BAR,
+ .name = "cs5535-gpio",
+ .num_resources = 1,
+ .resources = &cs5535_mfd_resources[GPIO_BAR],
+ },
+ {
+ .id = MFGPT_BAR,
+ .name = "cs5535-mfgpt",
+ .num_resources = 1,
+ .resources = &cs5535_mfd_resources[MFGPT_BAR],
+ },
+ {
+ .id = PMS_BAR,
+ .name = "cs5535-pms",
+ .num_resources = 1,
+ .resources = &cs5535_mfd_resources[PMS_BAR],
+
+ .enable = cs5535_mfd_res_enable,
+ .disable = cs5535_mfd_res_disable,
+ },
+ {
+ .id = ACPI_BAR,
+ .name = "cs5535-acpi",
+ .num_resources = 1,
+ .resources = &cs5535_mfd_resources[ACPI_BAR],
+
+ .enable = cs5535_mfd_res_enable,
+ .disable = cs5535_mfd_res_disable,
+ },
+};
+
+#ifdef CONFIG_OLPC
+static void cs5535_clone_olpc_cells(void)
+{
+ const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
+
+ if (!machine_is_olpc())
+ return;
+
+ mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
+}
+#else
+static void cs5535_clone_olpc_cells(void) { }
+#endif
+
+static int cs5535_mfd_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int err, i;
+
+ err = pci_enable_device(pdev);
+ if (err)
+ return err;
+
+ /* fill in IO range for each cell; subdrivers handle the region */
+ for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
+ int bar = cs5535_mfd_cells[i].id;
+ struct resource *r = &cs5535_mfd_resources[bar];
+
+ r->flags = IORESOURCE_IO;
+ r->start = pci_resource_start(pdev, bar);
+ r->end = pci_resource_end(pdev, bar);
+
+ /* id is used for temporarily storing BAR; unset it now */
+ cs5535_mfd_cells[i].id = 0;
+ }
+
+ err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
+ ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
+ if (err) {
+ dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
+ goto err_disable;
+ }
+ cs5535_clone_olpc_cells();
+
+ dev_info(&pdev->dev, "%zu devices registered.\n",
+ ARRAY_SIZE(cs5535_mfd_cells));
+
+ return 0;
+
+err_disable:
+ pci_disable_device(pdev);
+ return err;
+}
+
+static void cs5535_mfd_remove(struct pci_dev *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+ pci_disable_device(pdev);
+}
+
+static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
+
+static struct pci_driver cs5535_mfd_driver = {
+ .name = DRV_NAME,
+ .id_table = cs5535_mfd_pci_tbl,
+ .probe = cs5535_mfd_probe,
+ .remove = cs5535_mfd_remove,
+};
+
+module_pci_driver(cs5535_mfd_driver);
+
+MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
+MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
+MODULE_LICENSE("GPL");