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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-08 02:56:04 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-08 02:56:04 +0300 |
commit | 6dc3eb5c1f96641cda7056aa34393e317076d6cf (patch) | |
tree | 9a615b884d7ff5375382b5a3f020f518f618c589 /drivers/gpio/wm8350-gpiolib.c | |
parent | 8fe900b8c7aa6a307e552ff776e0c04c28dcf9c8 (diff) | |
parent | 2c08583c6a6b4c5f5dea4cb0931eca82af7db6fe (diff) | |
download | linux-6dc3eb5c1f96641cda7056aa34393e317076d6cf.tar.xz |
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: (66 commits)
mfd: Fix ucb1x00 build failure for collie_defconfig
mfd: Fix lpc_sch related depends/selects, fix build error
gpio: Fix sch_gpio warning
gpio: add Intel SCH GPIO controller driver
i2c: convert i2c-isch to platform_device
mfd: Use completion interrupt for WM831x AUXADC
mfd: Use completion interrupt for WM835x AUXADC
mfd: Introduce remove_script function for twl4030
mfd/mmc: SDHI Kconfig update
mfd: sh_mobile_sdhi MMC_CAP_MMC_HIGHSPEED support
gpiolib: Force wm831x GPIOs into GPIO mode when requested
mfd: Add WM831x revision B support
gpiolib: Correct debugfs display of WM831x GPIO inversion
gpiolib: Actually set output state in wm831x_gpio_direction_output()
tmio_mmc: Balance cell enable()/disable() calls
tmio_mmc: Remove const from platform data V3
tmio_mmc: Use 100ms mmc_detect_change() delay
tmio_mmc: Add MMC_CAP_MMC_HIGHSPEED support V2
tmio_mmc: Keep card-detect interrupts enabled
mfd: Add twl6030 base addr for ID0, ID1, ID2
...
Diffstat (limited to 'drivers/gpio/wm8350-gpiolib.c')
-rw-r--r-- | drivers/gpio/wm8350-gpiolib.c | 181 |
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"); |