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Date: Thu, 7 Jan 2010 16:10:08 +0000
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: Samuel Ortiz <sameo@...ux.intel.com>,
David Brownell <dbrownell@...rs.sourceforge.net>
Cc: linux-kernel@...r.kernel.org,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] gpiolib: Add support for WM8350 GPIO controller
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/wm8350-gpiolib.c | 181 +++++++++++++++++++++++++++++++++++++++
include/linux/mfd/wm8350/core.h | 2 +
include/linux/mfd/wm8350/gpio.h | 1 +
5 files changed, 192 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/wm8350-gpiolib.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a019b49..e353fa1 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -162,6 +162,13 @@ 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 52fe4cf..970a271 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_GPIO_CS5535) += cs5535-gpio.o
obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.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
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@...nsource.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@...nsource.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
--- 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
--- 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
--
1.6.6
--
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