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>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a4cdbd5..acac9f6 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -185,6 +185,13 @@ config GPIO_WM831X
          Say yes here to access the GPIO signals of WM831x power management
          chips from Wolfson Microelectronics.
 
+config GPIO_WM8350
+       tristate "WM8350 GPIOs"
+       depends on MFD_WM8350
+       help
+         Say yes here to access the GPIO signals of WM8350 power management
+         chips from Wolfson Microelectronics.
+
 config GPIO_ADP5520
        tristate "GPIO Support for ADP5520 PMIC"
        depends on PMIC_ADP5520

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 128abf8..90b0880 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_GPIO_BT8XX)      += bt8xxgpio.o
 obj-$(CONFIG_GPIO_IT8761E)     += it8761e_gpio.o
 obj-$(CONFIG_GPIO_VR41XX)      += vr41xx_giu.o
 obj-$(CONFIG_GPIO_WM831X)      += wm831x-gpio.o
+obj-$(CONFIG_GPIO_WM8350)      += wm8350-gpiolib.o

diff --git a/drivers/gpio/wm8350-gpiolib.c b/drivers/gpio/wm8350-gpiolib.c
new file mode 100644 (file)
index 0000000..511840d
--- /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");

diff --git a/include/linux/mfd/wm8350/core.h b/include/linux/mfd/wm8350/core.h
index 04217a7..fae08aa 100644 (file)
--- a/include/linux/mfd/wm8350/core.h
+++ b/include/linux/mfd/wm8350/core.h
@@ -645,11 +645,13 @@ struct wm8350 {
  *        used by the platform to configure GPIO functions and similar.
  * @irq_high: Set if WM8350 IRQ is active high.
  * @irq_base: Base IRQ for genirq (not currently used).
+ * @gpio_base: Base for gpiolib.
  */
 struct wm8350_platform_data {
        int (*init)(struct wm8350 *wm8350);
        int irq_high;
        int irq_base;
+       int gpio_base;
 };
 
 

diff --git a/include/linux/mfd/wm8350/gpio.h b/include/linux/mfd/wm8350/gpio.h
index 71af3d6..d657bcd 100644 (file)
--- a/include/linux/mfd/wm8350/gpio.h
+++ b/include/linux/mfd/wm8350/gpio.h
@@ -29,6 +29,7 @@
 #define WM8350_GPIO_FUNCTION_SELECT_2           0x8D
 #define WM8350_GPIO_FUNCTION_SELECT_3           0x8E
 #define WM8350_GPIO_FUNCTION_SELECT_4           0x8F
+#define WM8350_GPIO_LEVEL                      0xE6
 
 /*
  * GPIO Functions