Add gpiolib driver for gpio pins placed on the LoCoMo GA.
Signed-off-by: Dmitry Eremin-Solenikov dbaryshkov@gmail.com Reviewed-by: Linus Walleij linus.walleij@linaro.org --- drivers/gpio/Kconfig | 12 ++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-locomo.c | 170 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 183 insertions(+) create mode 100644 drivers/gpio/gpio-locomo.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index caefe80..4542684 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -734,6 +734,18 @@ config GPIO_KEMPLD This driver can also be built as a module. If so, the module will be called gpio-kempld.
+config GPIO_LOCOMO + bool "Sharp LoCoMo GPIO support" + depends on MFD_LOCOMO + help + Select this to support GPIO pins on Sharp LoCoMo Grid Array found + in Sharp Zaurus collie and poodle models. + + Sat Yes if you have such PDA, say No otherwise. + + This driver can also be built as a module. If so, the module will be + called gpio-locomo. + config GPIO_LP3943 tristate "TI/National Semiconductor LP3943 GPIO expander" depends on MFD_LP3943 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index f71bb97..98655ae 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o obj-$(CONFIG_GPIO_INTEL_MID) += gpio-intel-mid.o +obj-$(CONFIG_GPIO_LOCOMO) += gpio-locomo.o obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o diff --git a/drivers/gpio/gpio-locomo.c b/drivers/gpio/gpio-locomo.c new file mode 100644 index 0000000..dd9a1ca --- /dev/null +++ b/drivers/gpio/gpio-locomo.c @@ -0,0 +1,170 @@ +/* + * Sharp LoCoMo support for GPIO + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This file contains all generic LoCoMo support. + * + * All initialization functions provided here are intended to be called + * from machine specific code with proper arguments when required. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/io.h> +#include <linux/regmap.h> +#include <linux/mfd/locomo.h> + +struct locomo_gpio { + struct regmap *regmap; + + struct gpio_chip gpio; + + u16 rising_edge; + u16 falling_edge; + + unsigned int save_gpo; + unsigned int save_gpe; +}; + +static int locomo_gpio_get(struct gpio_chip *chip, + unsigned offset) +{ + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + unsigned int gpl; + + regmap_read(lg->regmap, LOCOMO_GPL, &gpl); + + return gpl & BIT(offset); +} + +static void locomo_gpio_set(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + + regmap_update_bits(lg->regmap, LOCOMO_GPO, + BIT(offset), + value ? BIT(offset) : 0); +} + +static int locomo_gpio_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + + regmap_update_bits(lg->regmap, LOCOMO_GPD, BIT(offset), BIT(offset)); + regmap_update_bits(lg->regmap, LOCOMO_GPE, BIT(offset), BIT(offset)); + + return 0; +} + +static int locomo_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + + regmap_update_bits(lg->regmap, LOCOMO_GPO, + BIT(offset), + value ? BIT(offset) : 0); + regmap_update_bits(lg->regmap, LOCOMO_GPD, BIT(offset), 0); + regmap_update_bits(lg->regmap, LOCOMO_GPE, BIT(offset), 0); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int locomo_gpio_suspend(struct device *dev) +{ + struct locomo_gpio *lg = dev_get_drvdata(dev); + + regmap_read(lg->regmap, LOCOMO_GPO, &lg->save_gpo); + regmap_write(lg->regmap, LOCOMO_GPO, 0x00); + regmap_read(lg->regmap, LOCOMO_GPE, &lg->save_gpe); + regmap_write(lg->regmap, LOCOMO_GPE, 0x00); + + return 0; +} + +static int locomo_gpio_resume(struct device *dev) +{ + struct locomo_gpio *lg = dev_get_drvdata(dev); + + regmap_write(lg->regmap, LOCOMO_GPO, lg->save_gpo); + regmap_write(lg->regmap, LOCOMO_GPE, lg->save_gpe); + + return 0; +} +static SIMPLE_DEV_PM_OPS(locomo_gpio_pm, + locomo_gpio_suspend, locomo_gpio_resume); +#define LOCOMO_GPIO_PM (&locomo_gpio_pm) +#else +#define LOCOMO_GPIO_PM NULL +#endif + +static int locomo_gpio_probe(struct platform_device *pdev) +{ + struct locomo_gpio *lg; + int ret; + struct locomo_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); + + lg = devm_kzalloc(&pdev->dev, sizeof(struct locomo_gpio), + GFP_KERNEL); + if (!lg) + return -ENOMEM; + + lg->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!lg->regmap) + return -EINVAL; + + platform_set_drvdata(pdev, lg); + + regmap_write(lg->regmap, LOCOMO_GPO, 0x00); + regmap_write(lg->regmap, LOCOMO_GPE, 0x00); + regmap_write(lg->regmap, LOCOMO_GPD, 0x00); + regmap_write(lg->regmap, LOCOMO_GIE, 0x00); + + lg->gpio.base = pdata ? pdata->gpio_base : -1; + lg->gpio.label = "locomo-gpio"; + lg->gpio.ngpio = 16; + lg->gpio.set = locomo_gpio_set; + lg->gpio.get = locomo_gpio_get; + lg->gpio.direction_input = locomo_gpio_direction_input; + lg->gpio.direction_output = locomo_gpio_direction_output; + + ret = gpiochip_add(&lg->gpio); + if (ret) + return ret; + + return 0; +} + +static int locomo_gpio_remove(struct platform_device *pdev) +{ + struct locomo_gpio *lg = platform_get_drvdata(pdev); + + gpiochip_remove(&lg->gpio); + + return 0; +} + +static struct platform_driver locomo_gpio_driver = { + .probe = locomo_gpio_probe, + .remove = locomo_gpio_remove, + .driver = { + .name = "locomo-gpio", + .pm = LOCOMO_GPIO_PM, + }, +}; +module_platform_driver(locomo_gpio_driver); + +MODULE_DESCRIPTION("Sharp LoCoMo GPIO driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("John Lenz lenz@cs.wisc.edu"); +MODULE_ALIAS("platform:locomo-gpio");