gpiolib: Add support for WM8350 GPIO controller

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 181 insertions, 0 deletions

diff --git a/drivers/gpio/wm8350-gpiolib.c b/drivers/gpio/wm8350-gpiolib.c
new file mode 100644
index 000000000000..511840d1c7ba
--- /dev/null
+++ b/drivers/gpio/wm8350-gpiolib.c
@@ -0,0 +1,181 @@
+/*
+ * wm835x-gpiolib.c  --  gpiolib support for Wolfson WM835x 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/module.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/wm8350/core.h>
+#include <linux/mfd/wm8350/gpio.h>
+
+struct wm8350_gpio_data {
+        struct wm8350 *wm8350;
+        struct gpio_chip gpio_chip;
+};
+
+static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip)
+{
+        return container_of(chip, struct wm8350_gpio_data, gpio_chip);
+}
+
+static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
+        struct wm8350 *wm8350 = wm8350_gpio->wm8350;
+
+        return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
+                               1 << offset);
+}
+
+static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
+        struct wm8350 *wm8350 = wm8350_gpio->wm8350;
+        int ret;
+
+        ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
+        if (ret < 0)
+                return ret;
+
+        if (ret & (1 << offset))
+                return 1;
+        else
+                return 0;
+}
+
+static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
+        struct wm8350 *wm8350 = wm8350_gpio->wm8350;
+
+        if (value)
+                wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
+        else
+                wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
+}
+
+static int wm8350_gpio_direction_out(struct gpio_chip *chip,
+                                     unsigned offset, int value)
+{
+        struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
+        struct wm8350 *wm8350 = wm8350_gpio->wm8350;
+        int ret;
+
+        ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
+                                1 << offset);
+        if (ret < 0)
+                return ret;
+
+        /* Don't have an atomic direction/value setup */
+        wm8350_gpio_set(chip, offset, value);
+
+        return 0;
+}
+
+static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+        struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
+        struct wm8350 *wm8350 = wm8350_gpio->wm8350;
+
+        if (!wm8350->irq_base)
+                return -EINVAL;
+
+        return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
+}
+
+static struct gpio_chip template_chip = {
+        .label                  = "wm8350",
+        .owner                  = THIS_MODULE,
+        .direction_input        = wm8350_gpio_direction_in,
+        .get                    = wm8350_gpio_get,
+        .direction_output       = wm8350_gpio_direction_out,
+        .set                    = wm8350_gpio_set,
+        .to_irq                 = wm8350_gpio_to_irq,
+        .can_sleep              = 1,
+};
+
+static int __devinit wm8350_gpio_probe(struct platform_device *pdev)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
+        struct wm8350_platform_data *pdata = wm8350->dev->platform_data;
+        struct wm8350_gpio_data *wm8350_gpio;
+        int ret;
+
+        wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL);
+        if (wm8350_gpio == NULL)
+                return -ENOMEM;
+
+        wm8350_gpio->wm8350 = wm8350;
+        wm8350_gpio->gpio_chip = template_chip;
+        wm8350_gpio->gpio_chip.ngpio = 13;
+        wm8350_gpio->gpio_chip.dev = &pdev->dev;
+        if (pdata && pdata->gpio_base)
+                wm8350_gpio->gpio_chip.base = pdata->gpio_base;
+        else
+                wm8350_gpio->gpio_chip.base = -1;
+
+        ret = gpiochip_add(&wm8350_gpio->gpio_chip);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+                        ret);
+                goto err;
+        }
+
+        platform_set_drvdata(pdev, wm8350_gpio);
+
+        return ret;
+
+err:
+        kfree(wm8350_gpio);
+        return ret;
+}
+
+static int __devexit wm8350_gpio_remove(struct platform_device *pdev)
+{
+        struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
+        int ret;
+
+        ret = gpiochip_remove(&wm8350_gpio->gpio_chip);
+        if (ret == 0)
+                kfree(wm8350_gpio);
+
+        return ret;
+}
+
+static struct platform_driver wm8350_gpio_driver = {
+        .driver.name    = "wm8350-gpio",
+        .driver.owner   = THIS_MODULE,
+        .probe          = wm8350_gpio_probe,
+        .remove         = __devexit_p(wm8350_gpio_remove),
+};
+
+static int __init wm8350_gpio_init(void)
+{
+        return platform_driver_register(&wm8350_gpio_driver);
+}
+subsys_initcall(wm8350_gpio_init);
+
+static void __exit wm8350_gpio_exit(void)
+{
+        platform_driver_unregister(&wm8350_gpio_driver);
+}
+module_exit(wm8350_gpio_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-gpio");