linux-stable/drivers/gpio/gpio-tps65219.c
Bartosz Golaszewski 7dd1871e50 gpio: tps65219: don't use CONFIG_DEBUG_GPIO
CONFIG_DEBUG_GPIO should only be used to enable debug log messages and
for core GPIOLIB debugging. Don't use it to control the execution of
potentially buggy code. Just put it under an always-false #if.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
2023-12-27 15:56:48 +01:00

186 lines
5.0 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* GPIO driver for TI TPS65219 PMICs
*
* Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <linux/bits.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/tps65219.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define TPS65219_GPIO0_DIR_MASK BIT(3)
#define TPS65219_GPIO0_OFFSET 2
#define TPS65219_GPIO0_IDX 0
#define TPS65219_GPIO_DIR_IN 1
#define TPS65219_GPIO_DIR_OUT 0
struct tps65219_gpio {
struct gpio_chip gpio_chip;
struct tps65219 *tps;
};
static int tps65219_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct tps65219_gpio *gpio = gpiochip_get_data(gc);
int ret, val;
if (offset != TPS65219_GPIO0_IDX)
return GPIO_LINE_DIRECTION_OUT;
ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG, &val);
if (ret)
return ret;
return !!(val & TPS65219_GPIO0_DIR_MASK);
}
static int tps65219_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct tps65219_gpio *gpio = gpiochip_get_data(gc);
struct device *dev = gpio->tps->dev;
int ret, val;
if (offset != TPS65219_GPIO0_IDX) {
dev_err(dev, "GPIO%d is output only, cannot get\n", offset);
return -ENOTSUPP;
}
ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_CTRL, &val);
if (ret)
return ret;
ret = !!(val & BIT(TPS65219_MFP_GPIO_STATUS_MASK));
dev_warn(dev, "GPIO%d = %d, MULTI_DEVICE_ENABLE, not a standard GPIO\n", offset, ret);
/*
* Depending on NVM config, return an error if direction is output, otherwise the GPIO0
* status bit.
*/
if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
return -ENOTSUPP;
return ret;
}
static void tps65219_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
{
struct tps65219_gpio *gpio = gpiochip_get_data(gc);
struct device *dev = gpio->tps->dev;
int v, mask, bit;
bit = (offset == TPS65219_GPIO0_IDX) ? TPS65219_GPIO0_OFFSET : offset - 1;
mask = BIT(bit);
v = value ? mask : 0;
if (regmap_update_bits(gpio->tps->regmap, TPS65219_REG_GENERAL_CONFIG, mask, v))
dev_err(dev, "GPIO%d, set to value %d failed.\n", offset, value);
}
static int tps65219_gpio_change_direction(struct gpio_chip *gc, unsigned int offset,
unsigned int direction)
{
struct tps65219_gpio *gpio = gpiochip_get_data(gc);
struct device *dev = gpio->tps->dev;
/*
* Documentation is stating that GPIO0 direction must not be changed in Linux:
* Table 8-34. MFP_1_CONFIG(3): MULTI_DEVICE_ENABLE, should only be changed in INITIALIZE
* state (prior to ON Request).
* Set statically by NVM, changing direction in application can cause a hang.
* Below can be used for test purpose only.
*/
#if 0
int ret = regmap_update_bits(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG,
TPS65219_GPIO0_DIR_MASK, direction);
if (ret) {
dev_err(dev,
"GPIO DEBUG enabled: Fail to change direction to %u for GPIO%d.\n",
direction, offset);
return ret;
}
#endif
dev_err(dev,
"GPIO%d direction set by NVM, change to %u failed, not allowed by specification\n",
offset, direction);
return -ENOTSUPP;
}
static int tps65219_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
{
struct tps65219_gpio *gpio = gpiochip_get_data(gc);
struct device *dev = gpio->tps->dev;
if (offset != TPS65219_GPIO0_IDX) {
dev_err(dev, "GPIO%d is output only, cannot change to input\n", offset);
return -ENOTSUPP;
}
if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_IN)
return 0;
return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_IN);
}
static int tps65219_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value)
{
tps65219_gpio_set(gc, offset, value);
if (offset != TPS65219_GPIO0_IDX)
return 0;
if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
return 0;
return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_OUT);
}
static const struct gpio_chip tps65219_template_chip = {
.label = "tps65219-gpio",
.owner = THIS_MODULE,
.get_direction = tps65219_gpio_get_direction,
.direction_input = tps65219_gpio_direction_input,
.direction_output = tps65219_gpio_direction_output,
.get = tps65219_gpio_get,
.set = tps65219_gpio_set,
.base = -1,
.ngpio = 3,
.can_sleep = true,
};
static int tps65219_gpio_probe(struct platform_device *pdev)
{
struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
struct tps65219_gpio *gpio;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
gpio->tps = tps;
gpio->gpio_chip = tps65219_template_chip;
gpio->gpio_chip.parent = tps->dev;
return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
}
static struct platform_driver tps65219_gpio_driver = {
.driver = {
.name = "tps65219-gpio",
},
.probe = tps65219_gpio_probe,
};
module_platform_driver(tps65219_gpio_driver);
MODULE_ALIAS("platform:tps65219-gpio");
MODULE_AUTHOR("Jonathan Cormier <jcormier@criticallink.com>");
MODULE_DESCRIPTION("TPS65219 GPIO driver");
MODULE_LICENSE("GPL");