gpio: reorganize drivers

Sort the gpio makefile and enforce the naming convention gpio-*.c for
gpio drivers.

v2: cleaned up filenames in Kconfig and comment blocks
v3: fixup use of BASIC_MMIO to GENERIC_GPIO for mxc

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 317 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-wm831x.c b/drivers/gpio/gpio-wm831x.c
new file mode 100644
index 000000000000..31a9ed7bba83
--- /dev/null
+++ b/drivers/gpio/gpio-wm831x.c
@@ -0,0 +1,317 @@
+/*
+ * gpiolib support for Wolfson WM831x PMICs
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/gpio.h>
+#include <linux/mfd/wm831x/irq.h>
+
+struct wm831x_gpio {
+        struct wm831x *wm831x;
+        struct gpio_chip gpio_chip;
+};
+
+static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
+{
+        return container_of(chip, struct wm831x_gpio, gpio_chip);
+}
+
+static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int val = WM831X_GPN_DIR;
+
+        if (wm831x->has_gpio_ena)
+                val |= WM831X_GPN_TRI;
+
+        return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
+                               WM831X_GPN_DIR | WM831X_GPN_TRI |
+                               WM831X_GPN_FN_MASK, val);
+}
+
+static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int ret;
+
+        ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
+        if (ret < 0)
+                return ret;
+
+        if (ret & 1 << offset)
+                return 1;
+        else
+                return 0;
+}
+
+static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+
+        wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
+                        value << offset);
+}
+
+static int wm831x_gpio_direction_out(struct gpio_chip *chip,
+                                     unsigned offset, int value)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int val = 0;
+        int ret;
+
+        if (wm831x->has_gpio_ena)
+                val |= WM831X_GPN_TRI;
+
+        ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
+                              WM831X_GPN_DIR | WM831X_GPN_TRI |
+                              WM831X_GPN_FN_MASK, val);
+        if (ret < 0)
+                return ret;
+
+        /* Can only set GPIO state once it's in output mode */
+        wm831x_gpio_set(chip, offset, value);
+
+        return 0;
+}
+
+static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+
+        if (!wm831x->irq_base)
+                return -EINVAL;
+
+        return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
+}
+
+static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
+                                    unsigned debounce)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int reg = WM831X_GPIO1_CONTROL + offset;
+        int ret, fn;
+
+        ret = wm831x_reg_read(wm831x, reg);
+        if (ret < 0)
+                return ret;
+
+        switch (ret & WM831X_GPN_FN_MASK) {
+        case 0:
+        case 1:
+                break;
+        default:
+                /* Not in GPIO mode */
+                return -EBUSY;
+        }
+
+        if (debounce >= 32 && debounce <= 64)
+                fn = 0;
+        else if (debounce >= 4000 && debounce <= 8000)
+                fn = 1;
+        else
+                return -EINVAL;
+
+        return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+        struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+        struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int i, tristated;
+
+        for (i = 0; i < chip->ngpio; i++) {
+                int gpio = i + chip->base;
+                int reg;
+                const char *label, *pull, *powerdomain;
+
+                /* We report the GPIO even if it's not requested since
+                 * we're also reporting things like alternate
+                 * functions which apply even when the GPIO is not in
+                 * use as a GPIO.
+                 */
+                label = gpiochip_is_requested(chip, i);
+                if (!label)
+                        label = "Unrequested";
+
+                seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
+
+                reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
+                if (reg < 0) {
+                        dev_err(wm831x->dev,
+                                "GPIO control %d read failed: %d\n",
+                                gpio, reg);
+                        seq_printf(s, "\n");
+                        continue;
+                }
+
+                switch (reg & WM831X_GPN_PULL_MASK) {
+                case WM831X_GPIO_PULL_NONE:
+                        pull = "nopull";
+                        break;
+                case WM831X_GPIO_PULL_DOWN:
+                        pull = "pulldown";
+                        break;
+                case WM831X_GPIO_PULL_UP:
+                        pull = "pullup";
+                default:
+                        pull = "INVALID PULL";
+                        break;
+                }
+
+                switch (i + 1) {
+                case 1 ... 3:
+                case 7 ... 9:
+                        if (reg & WM831X_GPN_PWR_DOM)
+                                powerdomain = "VPMIC";
+                        else
+                                powerdomain = "DBVDD";
+                        break;
+
+                case 4 ... 6:
+                case 10 ... 12:
+                        if (reg & WM831X_GPN_PWR_DOM)
+                                powerdomain = "SYSVDD";
+                        else
+                                powerdomain = "DBVDD";
+                        break;
+
+                case 13 ... 16:
+                        powerdomain = "TPVDD";
+                        break;
+
+                default:
+                        BUG();
+                        break;
+                }
+
+                tristated = reg & WM831X_GPN_TRI;
+                if (wm831x->has_gpio_ena)
+                        tristated = !tristated;
+
+                seq_printf(s, " %s %s %s %s%s\n"
+                           "                                  %s%s (0x%4x)\n",
+                           reg & WM831X_GPN_DIR ? "in" : "out",
+                           wm831x_gpio_get(chip, i) ? "high" : "low",
+                           pull,
+                           powerdomain,
+                           reg & WM831X_GPN_POL ? "" : " inverted",
+                           reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
+                           tristated ? " tristated" : "",
+                           reg);
+        }
+}
+#else
+#define wm831x_gpio_dbg_show NULL
+#endif
+
+static struct gpio_chip template_chip = {
+        .label                  = "wm831x",
+        .owner                  = THIS_MODULE,
+        .direction_input        = wm831x_gpio_direction_in,
+        .get                    = wm831x_gpio_get,
+        .direction_output       = wm831x_gpio_direction_out,
+        .set                    = wm831x_gpio_set,
+        .to_irq                 = wm831x_gpio_to_irq,
+        .set_debounce           = wm831x_gpio_set_debounce,
+        .dbg_show               = wm831x_gpio_dbg_show,
+        .can_sleep              = 1,
+};
+
+static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
+{
+        struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+        struct wm831x_pdata *pdata = wm831x->dev->platform_data;
+        struct wm831x_gpio *wm831x_gpio;
+        int ret;
+
+        wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
+        if (wm831x_gpio == NULL)
+                return -ENOMEM;
+
+        wm831x_gpio->wm831x = wm831x;
+        wm831x_gpio->gpio_chip = template_chip;
+        wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
+        wm831x_gpio->gpio_chip.dev = &pdev->dev;
+        if (pdata && pdata->gpio_base)
+                wm831x_gpio->gpio_chip.base = pdata->gpio_base;
+        else
+                wm831x_gpio->gpio_chip.base = -1;
+
+        ret = gpiochip_add(&wm831x_gpio->gpio_chip);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+                        ret);
+                goto err;
+        }
+
+        platform_set_drvdata(pdev, wm831x_gpio);
+
+        return ret;
+
+err:
+        kfree(wm831x_gpio);
+        return ret;
+}
+
+static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
+{
+        struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
+        int ret;
+
+        ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
+        if (ret == 0)
+                kfree(wm831x_gpio);
+
+        return ret;
+}
+
+static struct platform_driver wm831x_gpio_driver = {
+        .driver.name    = "wm831x-gpio",
+        .driver.owner   = THIS_MODULE,
+        .probe          = wm831x_gpio_probe,
+        .remove         = __devexit_p(wm831x_gpio_remove),
+};
+
+static int __init wm831x_gpio_init(void)
+{
+        return platform_driver_register(&wm831x_gpio_driver);
+}
+subsys_initcall(wm831x_gpio_init);
+
+static void __exit wm831x_gpio_exit(void)
+{
+        platform_driver_unregister(&wm831x_gpio_driver);
+}
+module_exit(wm831x_gpio_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-gpio");