diff options
Diffstat (limited to 'drivers/mfd/pcf50633-gpio.c')
| -rw-r--r-- | drivers/mfd/pcf50633-gpio.c | 157 |
1 files changed, 132 insertions, 25 deletions
diff --git a/drivers/mfd/pcf50633-gpio.c b/drivers/mfd/pcf50633-gpio.c index 9ab19a8f669..dc49defed23 100644 --- a/drivers/mfd/pcf50633-gpio.c +++ b/drivers/mfd/pcf50633-gpio.c @@ -2,6 +2,7 @@ * * (C) 2006-2008 by Openmoko, Inc. * Author: Balaji Rao <balajirrao@openmoko.org> + * Copyright 2010, Lars-Peter Clausen <lars@metafoo.de> * All rights reserved. * * Broken down from monstrous PCF50633 driver mainly by @@ -17,8 +18,14 @@ #include <linux/kernel.h> #include <linux/module.h> +#include <linux/platform_device.h> + #include <linux/mfd/pcf50633/core.h> #include <linux/mfd/pcf50633/gpio.h> +#include <linux/gpio.h> + +#define PCF50633_REG_GPIOCTL 0x13 +#define PCF50633_REG_GPIOCFG(x) (0x14 + (x)) enum pcf50633_regulator_id { PCF50633_REGULATOR_AUTO, @@ -60,54 +67,89 @@ static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = { [PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT, }; -int pcf50633_gpio_set(struct pcf50633 *pcf, int gpio, u8 val) +struct pcf50633_gpio { + struct pcf50633 *pcf; + struct gpio_chip chip; +}; + +static inline struct pcf50633 *gpio_chip_to_pcf50633(struct gpio_chip *chip) +{ + struct pcf50633 *pcf = dev_to_pcf50633(chip->dev->parent); + return pcf; +} + +static void pcf50633_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) { + struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip); u8 reg; - reg = gpio - PCF50633_GPIO1 + PCF50633_REG_GPIO1CFG; + reg = PCF50633_REG_GPIOCFG(gpio); - return pcf50633_reg_set_bit_mask(pcf, reg, 0x07, val); + pcf50633_reg_set_bit_mask(pcf, reg, 0x07, value ? 0x0 : 0x7); } -EXPORT_SYMBOL_GPL(pcf50633_gpio_set); -u8 pcf50633_gpio_get(struct pcf50633 *pcf, int gpio) +static int pcf50633_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { - u8 reg, val; - - reg = gpio - PCF50633_GPIO1 + PCF50633_REG_GPIO1CFG; - val = pcf50633_reg_read(pcf, reg) & 0x07; - - return val; + struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip); + return pcf50633_reg_read(pcf, PCF50633_REG_GPIOCFG(gpio)) >> 3; } -EXPORT_SYMBOL_GPL(pcf50633_gpio_get); -int pcf50633_gpio_invert_set(struct pcf50633 *pcf, int gpio, int invert) + +static int pcf50633_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, + int value) { - u8 val, reg; + struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip); + int ret; - reg = gpio - PCF50633_GPIO1 + PCF50633_REG_GPIO1CFG; - val = !!invert << 3; + ret = pcf50633_gpio_set_config(pcf, pcf->pdata->gpio_base + gpio, + PCF50633_GPIO_CONFIG_OUTPUT); + if (!ret) + pcf50633_gpio_set_value(chip, gpio, value); - return pcf50633_reg_set_bit_mask(pcf, reg, 1 << 3, val); + return ret; } -EXPORT_SYMBOL_GPL(pcf50633_gpio_invert_set); -int pcf50633_gpio_invert_get(struct pcf50633 *pcf, int gpio) +static int pcf50633_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { - u8 reg, val; - - reg = gpio - PCF50633_GPIO1 + PCF50633_REG_GPIO1CFG; - val = pcf50633_reg_read(pcf, reg); + return -ENOSYS; +} - return val & (1 << 3); +int pcf50633_gpio_set_config(struct pcf50633 *pcf, unsigned gpio, + enum pcf50633_gpio_config config) +{ + u8 reg; + u8 direction; + int ret; + + gpio -= pcf->pdata->gpio_base; + + if (gpio < 3) { + direction = (config == PCF50633_GPIO_CONFIG_INPUT) ? (1 << gpio) : 0; + ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_GPIOCTL, (1 << gpio), + direction); + if (ret) { + return ret; + } + } else if (gpio > 3 || config == PCF50633_GPIO_CONFIG_INPUT) { + return -EINVAL; + } + + if (config != PCF50633_GPIO_CONFIG_INPUT) { + reg = PCF50633_REG_GPIOCFG(gpio); + ret = pcf50633_reg_set_bit_mask(pcf, reg, 0x0f, config); + } + + return ret; } -EXPORT_SYMBOL_GPL(pcf50633_gpio_invert_get); +EXPORT_SYMBOL_GPL(pcf50633_gpio_set_config); int pcf50633_gpio_power_supply_set(struct pcf50633 *pcf, int gpio, int regulator, int on) { u8 reg, val, mask; + gpio -= pcf->pdata->gpio_base; + /* the *ENA register is always one after the *OUT register */ reg = pcf50633_regulator_registers[regulator] + 1; @@ -118,4 +160,69 @@ int pcf50633_gpio_power_supply_set(struct pcf50633 *pcf, } EXPORT_SYMBOL_GPL(pcf50633_gpio_power_supply_set); + +static int __devinit pcf50633_gpio_probe(struct platform_device *pdev) +{ + struct pcf50633 *pcf = dev_to_pcf50633(pdev->dev.parent); + struct pcf50633_gpio *pcf_gpio; + + pcf_gpio = kzalloc(sizeof(*pcf_gpio), GFP_KERNEL); + + if (!pcf_gpio) + return -ENOMEM; + + pcf_gpio->pcf = pcf; + + pcf_gpio->chip.direction_input = pcf50633_gpio_direction_input; + pcf_gpio->chip.direction_output = pcf50633_gpio_direction_output; + pcf_gpio->chip.get = pcf50633_gpio_get_value; + pcf_gpio->chip.set = pcf50633_gpio_set_value; + + pcf_gpio->chip.base = pcf->pdata->gpio_base; + pcf_gpio->chip.ngpio = 4; + pcf_gpio->chip.label = dev_name(pcf->dev); + pcf_gpio->chip.can_sleep = 1; + pcf_gpio->chip.owner = THIS_MODULE; + pcf_gpio->chip.dev = &pdev->dev; + + platform_set_drvdata(pdev, pcf_gpio); + + return gpiochip_add(&pcf_gpio->chip); +} + +static int __devexit pcf50633_gpio_remove(struct platform_device *pdev) +{ + struct pcf50633_gpio *pcf_gpio = platform_get_drvdata(pdev); + + gpiochip_remove(&pcf_gpio->chip); + + platform_set_drvdata(pdev, NULL); + kfree(pcf_gpio); + + return 0; +} + +static struct platform_driver pcf50633_gpio_driver = { + .probe = pcf50633_gpio_probe, + .remove = __devexit_p(pcf50633_gpio_remove), + .driver = { + .name = "pcf50633-gpio", + .owner = THIS_MODULE, + }, +}; + +int __init pcf50633_gpio_init(void) +{ + return platform_driver_register(&pcf50633_gpio_driver); +} +module_init(pcf50633_gpio_init); + +void __exit pcf50633_gpio_exit(void) +{ + platform_driver_unregister(&pcf50633_gpio_driver); +} +module_exit(pcf50633_gpio_exit); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("GPIO driver for the PCF50633"); MODULE_LICENSE("GPL"); |