From 275b13a65547e2dc39c75d660d2e0f0fddde90f6 Mon Sep 17 00:00:00 2001 From: Rajmohan Mani Date: Fri, 28 Jul 2017 17:30:25 -0700 Subject: gpio: Add support for TPS68470 GPIOs This patch adds support for TPS68470 GPIOs. There are 7 GPIOs and a few sensor related GPIOs. These GPIOs can be requested and configured as appropriate. The GPIOs are also provided with descriptive names. However, the typical use case is that the OS GPIO driver will interact with TPS68470 GPIO driver to configure these GPIOs, as requested by the platform firmware. Signed-off-by: Rajmohan Mani Signed-off-by: Linus Walleij --- drivers/gpio/gpio-tps68470.c | 176 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 176 insertions(+) create mode 100644 drivers/gpio/gpio-tps68470.c (limited to 'drivers/gpio/gpio-tps68470.c') diff --git a/drivers/gpio/gpio-tps68470.c b/drivers/gpio/gpio-tps68470.c new file mode 100644 index 000000000000..fa2662f8b026 --- /dev/null +++ b/drivers/gpio/gpio-tps68470.c @@ -0,0 +1,176 @@ +/* + * GPIO driver for TPS68470 PMIC + * + * Copyright (C) 2017 Intel Corporation + * + * Authors: + * Antti Laakso + * Tianshu Qiu + * Jian Xu Zheng + * Yuning Pu + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#define TPS68470_N_LOGIC_OUTPUT 3 +#define TPS68470_N_REGULAR_GPIO 7 +#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO) + +struct tps68470_gpio_data { + struct regmap *tps68470_regmap; + struct gpio_chip gc; +}; + +static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); + struct regmap *regmap = tps68470_gpio->tps68470_regmap; + unsigned int reg = TPS68470_REG_GPDO; + int val, ret; + + if (offset >= TPS68470_N_REGULAR_GPIO) { + offset -= TPS68470_N_REGULAR_GPIO; + reg = TPS68470_REG_SGPO; + } + + ret = regmap_read(regmap, reg, &val); + if (ret) { + dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", + TPS68470_REG_SGPO); + return ret; + } + return !!(val & BIT(offset)); +} + +/* Return 0 if output, 1 if input */ +static int tps68470_gpio_get_direction(struct gpio_chip *gc, + unsigned int offset) +{ + struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); + struct regmap *regmap = tps68470_gpio->tps68470_regmap; + int val, ret; + + /* rest are always outputs */ + if (offset >= TPS68470_N_REGULAR_GPIO) + return 0; + + ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val); + if (ret) { + dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", + TPS68470_GPIO_CTL_REG_A(offset)); + return ret; + } + + val &= TPS68470_GPIO_MODE_MASK; + return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1; +} + +static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); + struct regmap *regmap = tps68470_gpio->tps68470_regmap; + unsigned int reg = TPS68470_REG_GPDO; + + if (offset >= TPS68470_N_REGULAR_GPIO) { + reg = TPS68470_REG_SGPO; + offset -= TPS68470_N_REGULAR_GPIO; + } + + regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0); +} + +static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); + struct regmap *regmap = tps68470_gpio->tps68470_regmap; + + /* rest are always outputs */ + if (offset >= TPS68470_N_REGULAR_GPIO) + return 0; + + /* Set the initial value */ + tps68470_gpio_set(gc, offset, value); + + return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), + TPS68470_GPIO_MODE_MASK, + TPS68470_GPIO_MODE_OUT_CMOS); +} + +static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset) +{ + struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); + struct regmap *regmap = tps68470_gpio->tps68470_regmap; + + /* rest are always outputs */ + if (offset >= TPS68470_N_REGULAR_GPIO) + return -EINVAL; + + return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), + TPS68470_GPIO_MODE_MASK, 0x00); +} + +static const char *tps68470_names[TPS68470_N_GPIO] = { + "gpio.0", "gpio.1", "gpio.2", "gpio.3", + "gpio.4", "gpio.5", "gpio.6", + "s_enable", "s_idle", "s_resetn", +}; + +static int tps68470_gpio_probe(struct platform_device *pdev) +{ + struct tps68470_gpio_data *tps68470_gpio; + int ret; + + tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio), + GFP_KERNEL); + if (!tps68470_gpio) + return -ENOMEM; + + tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent); + tps68470_gpio->gc.label = "tps68470-gpio"; + tps68470_gpio->gc.owner = THIS_MODULE; + tps68470_gpio->gc.direction_input = tps68470_gpio_input; + tps68470_gpio->gc.direction_output = tps68470_gpio_output; + tps68470_gpio->gc.get = tps68470_gpio_get; + tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction; + tps68470_gpio->gc.set = tps68470_gpio_set; + tps68470_gpio->gc.can_sleep = true; + tps68470_gpio->gc.names = tps68470_names; + tps68470_gpio->gc.ngpio = TPS68470_N_GPIO; + tps68470_gpio->gc.base = -1; + tps68470_gpio->gc.parent = &pdev->dev; + + ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, + tps68470_gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, tps68470_gpio); + + return ret; +} + +static struct platform_driver tps68470_gpio_driver = { + .driver = { + .name = "tps68470-gpio", + }, + .probe = tps68470_gpio_probe, +}; + +builtin_platform_driver(tps68470_gpio_driver) -- cgit v1.2.3