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![Matti Vaittinen](/assets/img/avatar_default.png)
It's hard for occasional GPIO code reader/writer to know if values 0/1 equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT to help them out. NOTE - for gpio-amd-fch and gpio-bd9571mwv: This commit also changes the return value for direction get to equal 1 for direction INPUT. Prior this commit these drivers might have returned some other positive value but 1 for INPUT. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
168 lines
4.6 KiB
C
168 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* GPIO driver for TPS68470 PMIC
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*
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* Copyright (C) 2017 Intel Corporation
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*
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* Authors:
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* Antti Laakso <antti.laakso@intel.com>
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* Tianshu Qiu <tian.shu.qiu@intel.com>
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* Jian Xu Zheng <jian.xu.zheng@intel.com>
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* Yuning Pu <yuning.pu@intel.com>
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*/
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#include <linux/gpio/driver.h>
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#include <linux/mfd/tps68470.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define TPS68470_N_LOGIC_OUTPUT 3
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#define TPS68470_N_REGULAR_GPIO 7
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#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
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struct tps68470_gpio_data {
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struct regmap *tps68470_regmap;
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struct gpio_chip gc;
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};
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static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
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{
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struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
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struct regmap *regmap = tps68470_gpio->tps68470_regmap;
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unsigned int reg = TPS68470_REG_GPDO;
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int val, ret;
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if (offset >= TPS68470_N_REGULAR_GPIO) {
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offset -= TPS68470_N_REGULAR_GPIO;
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reg = TPS68470_REG_SGPO;
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}
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ret = regmap_read(regmap, reg, &val);
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if (ret) {
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dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
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TPS68470_REG_SGPO);
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return ret;
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}
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return !!(val & BIT(offset));
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}
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static int tps68470_gpio_get_direction(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
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struct regmap *regmap = tps68470_gpio->tps68470_regmap;
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int val, ret;
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/* rest are always outputs */
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if (offset >= TPS68470_N_REGULAR_GPIO)
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return GPIO_LINE_DIRECTION_OUT;
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ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
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if (ret) {
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dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
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TPS68470_GPIO_CTL_REG_A(offset));
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return ret;
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}
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val &= TPS68470_GPIO_MODE_MASK;
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return val >= TPS68470_GPIO_MODE_OUT_CMOS ? GPIO_LINE_DIRECTION_OUT :
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GPIO_LINE_DIRECTION_IN;
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}
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static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
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int value)
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{
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struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
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struct regmap *regmap = tps68470_gpio->tps68470_regmap;
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unsigned int reg = TPS68470_REG_GPDO;
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if (offset >= TPS68470_N_REGULAR_GPIO) {
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reg = TPS68470_REG_SGPO;
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offset -= TPS68470_N_REGULAR_GPIO;
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}
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regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
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}
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static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
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int value)
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{
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struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
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struct regmap *regmap = tps68470_gpio->tps68470_regmap;
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/* rest are always outputs */
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if (offset >= TPS68470_N_REGULAR_GPIO)
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return 0;
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/* Set the initial value */
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tps68470_gpio_set(gc, offset, value);
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return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
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TPS68470_GPIO_MODE_MASK,
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TPS68470_GPIO_MODE_OUT_CMOS);
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}
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static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
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{
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struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
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struct regmap *regmap = tps68470_gpio->tps68470_regmap;
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/* rest are always outputs */
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if (offset >= TPS68470_N_REGULAR_GPIO)
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return -EINVAL;
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return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
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TPS68470_GPIO_MODE_MASK, 0x00);
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}
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static const char *tps68470_names[TPS68470_N_GPIO] = {
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"gpio.0", "gpio.1", "gpio.2", "gpio.3",
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"gpio.4", "gpio.5", "gpio.6",
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"s_enable", "s_idle", "s_resetn",
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};
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static int tps68470_gpio_probe(struct platform_device *pdev)
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{
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struct tps68470_gpio_data *tps68470_gpio;
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int ret;
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tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
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GFP_KERNEL);
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if (!tps68470_gpio)
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return -ENOMEM;
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tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
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tps68470_gpio->gc.label = "tps68470-gpio";
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tps68470_gpio->gc.owner = THIS_MODULE;
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tps68470_gpio->gc.direction_input = tps68470_gpio_input;
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tps68470_gpio->gc.direction_output = tps68470_gpio_output;
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tps68470_gpio->gc.get = tps68470_gpio_get;
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tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
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tps68470_gpio->gc.set = tps68470_gpio_set;
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tps68470_gpio->gc.can_sleep = true;
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tps68470_gpio->gc.names = tps68470_names;
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tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
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tps68470_gpio->gc.base = -1;
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tps68470_gpio->gc.parent = &pdev->dev;
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ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
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tps68470_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, tps68470_gpio);
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return ret;
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}
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static struct platform_driver tps68470_gpio_driver = {
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.driver = {
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.name = "tps68470-gpio",
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},
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.probe = tps68470_gpio_probe,
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};
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builtin_platform_driver(tps68470_gpio_driver)
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