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![Alexandru Ardelean](/assets/img/avatar_default.png)
The platform_set_drvdata() call is only useful if we need to retrieve back the private information. Since the driver doesn't do that, it's not useful to have it. If this is removed, we can also just do a direct return on devm_gpiochip_add_data(). We don't need to print that this call failed as there are other ways to log/see this during probe. Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
158 lines
4.4 KiB
C
158 lines
4.4 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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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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return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
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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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