Add driver for lp87565 PMIC family GPIOs. Three GPIOs are supported and can be configured in Open-drain output or Push-pull output. Signed-off-by: Keerthy <j-keerthy@xxxxxx> --- Latest version of mfd patch: https://patchwork.kernel.org/patch/9783079/ Changes in v2: * included <linux/gpio/driver.h> * stored the struct regmap *map instead of whole lp87565 struct * clamped return values to [0,1] where necessary. * Added more comments to explain the 2 modes. * platform_set_drvdata(pdev, gpio) drivers/gpio/Kconfig | 10 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-lp87565.c | 190 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 201 insertions(+) create mode 100644 drivers/gpio/gpio-lp87565.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 2e7d9ff..f235eae 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -965,6 +965,16 @@ config GPIO_LP873X This driver can also be built as a module. If so, the module will be called gpio-lp873x. +config GPIO_LP87565 + tristate "TI LP87565 GPIO" + depends on MFD_TI_LP87565 + help + This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present + on LP87565 PMICs. + + This driver can also be built as a module. If so, the module will be + called gpio-lp87565. + config GPIO_MAX77620 tristate "GPIO support for PMIC MAX77620 and MAX20024" depends on MFD_MAX77620 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index bcd0a0b..a9fda6c 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o +obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o diff --git a/drivers/gpio/gpio-lp87565.c b/drivers/gpio/gpio-lp87565.c new file mode 100644 index 0000000..6313c50 --- /dev/null +++ b/drivers/gpio/gpio-lp87565.c @@ -0,0 +1,190 @@ +/* + * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ + * Keerthy <j-keerthy@xxxxxx> + * + * 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 program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether expressed or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2 for more details. + * + * Based on the LP873X driver + */ + +#include <linux/gpio/driver.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include <linux/mfd/lp87565.h> + +struct lp87565_gpio { + struct gpio_chip chip; + struct regmap *map; +}; + +static int lp87565_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(chip); + int ret, val; + + ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val); + if (ret < 0) + return ret; + + return !(val & BIT(offset)); +} + +static int lp87565_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(chip); + + return regmap_update_bits(gpio->map, + LP87565_REG_GPIO_CONFIG, + BIT(offset), 0); +} + +static int lp87565_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(chip); + + return regmap_update_bits(gpio->map, + LP87565_REG_GPIO_CONFIG, + BIT(offset), !value ? BIT(offset) : 0); +} + +static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(chip); + int ret, val; + + ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val); + if (ret < 0) + return ret; + + return !!(val & BIT(offset)); +} + +static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(chip); + + regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT, + BIT(offset), value ? BIT(offset) : 0); +} + +static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(gc); + int ret; + + switch (offset) { + case 0: + case 1: + case 2: + /* + * MUX can program the pin to be in EN1/2/3 pin mode + * Or GPIO1/2/3 mode. + * Setup the GPIO*_SEL MUX to GPIO mode + */ + ret = regmap_update_bits(gpio->map, + LP87565_REG_PIN_FUNCTION, + BIT(offset), BIT(offset)); + if (ret) + return ret; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset, + unsigned long config) +{ + struct lp87565_gpio *gpio = gpiochip_get_data(gc); + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + return regmap_update_bits(gpio->map, + LP87565_REG_GPIO_CONFIG, + BIT(offset + + __ffs(LP87565_GOIO1_OD)), + BIT(offset + + __ffs(LP87565_GOIO1_OD))); + case PIN_CONFIG_DRIVE_PUSH_PULL: + return regmap_update_bits(gpio->map, + LP87565_REG_GPIO_CONFIG, + BIT(offset + + __ffs(LP87565_GOIO1_OD)), 0); + default: + return -ENOTSUPP; + } +} + +static const struct gpio_chip template_chip = { + .label = "lp87565-gpio", + .owner = THIS_MODULE, + .request = lp87565_gpio_request, + .get_direction = lp87565_gpio_get_direction, + .direction_input = lp87565_gpio_direction_input, + .direction_output = lp87565_gpio_direction_output, + .get = lp87565_gpio_get, + .set = lp87565_gpio_set, + .set_config = lp87565_gpio_set_config, + .base = -1, + .ngpio = 3, + .can_sleep = true, +}; + +static int lp87565_gpio_probe(struct platform_device *pdev) +{ + struct lp87565_gpio *gpio; + struct lp87565 *lp87565; + int ret; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + lp87565 = dev_get_drvdata(pdev->dev.parent); + gpio->chip = template_chip; + gpio->chip.parent = lp87565->dev; + gpio->map = lp87565->regmap; + + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); + return ret; + } + + return 0; +} + +static const struct platform_device_id lp87565_gpio_id_table[] = { + { "lp87565-q1-gpio", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table); + +static struct platform_driver lp87565_gpio_driver = { + .driver = { + .name = "lp87565-gpio", + }, + .probe = lp87565_gpio_probe, + .id_table = lp87565_gpio_id_table, +}; +module_platform_driver(lp87565_gpio_driver); + +MODULE_AUTHOR("Keerthy <j-keerthy@xxxxxx>"); +MODULE_DESCRIPTION("LP87565 GPIO driver"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
