mirror of
https://github.com/edk2-porting/linux-next.git
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191 lines
5.0 KiB
C
191 lines
5.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// GPIO driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/mfd/max77650.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 MAX77650_GPIO_DIR_MASK BIT(0)
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#define MAX77650_GPIO_INVAL_MASK BIT(1)
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#define MAX77650_GPIO_DRV_MASK BIT(2)
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#define MAX77650_GPIO_OUTVAL_MASK BIT(3)
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#define MAX77650_GPIO_DEBOUNCE_MASK BIT(4)
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#define MAX77650_GPIO_DIR_OUT 0x00
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#define MAX77650_GPIO_DIR_IN BIT(0)
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#define MAX77650_GPIO_OUT_LOW 0x00
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#define MAX77650_GPIO_OUT_HIGH BIT(3)
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#define MAX77650_GPIO_DRV_OPEN_DRAIN 0x00
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#define MAX77650_GPIO_DRV_PUSH_PULL BIT(2)
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#define MAX77650_GPIO_DEBOUNCE BIT(4)
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#define MAX77650_GPIO_DIR_BITS(_reg) \
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((_reg) & MAX77650_GPIO_DIR_MASK)
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#define MAX77650_GPIO_INVAL_BITS(_reg) \
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(((_reg) & MAX77650_GPIO_INVAL_MASK) >> 1)
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struct max77650_gpio_chip {
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struct regmap *map;
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struct gpio_chip gc;
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int irq;
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};
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static int max77650_gpio_direction_input(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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return regmap_update_bits(chip->map,
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MAX77650_REG_CNFG_GPIO,
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MAX77650_GPIO_DIR_MASK,
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MAX77650_GPIO_DIR_IN);
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}
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static int max77650_gpio_direction_output(struct gpio_chip *gc,
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unsigned int offset, int value)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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int mask, regval;
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mask = MAX77650_GPIO_DIR_MASK | MAX77650_GPIO_OUTVAL_MASK;
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regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
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regval |= MAX77650_GPIO_DIR_OUT;
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return regmap_update_bits(chip->map,
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MAX77650_REG_CNFG_GPIO, mask, regval);
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}
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static void max77650_gpio_set_value(struct gpio_chip *gc,
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unsigned int offset, int value)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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int rv, regval;
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regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
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rv = regmap_update_bits(chip->map, MAX77650_REG_CNFG_GPIO,
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MAX77650_GPIO_OUTVAL_MASK, regval);
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if (rv)
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dev_err(gc->parent, "cannot set GPIO value: %d\n", rv);
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}
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static int max77650_gpio_get_value(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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unsigned int val;
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int rv;
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rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
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if (rv)
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return rv;
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return MAX77650_GPIO_INVAL_BITS(val);
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}
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static int max77650_gpio_get_direction(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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unsigned int val;
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int rv;
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rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
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if (rv)
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return rv;
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return MAX77650_GPIO_DIR_BITS(val);
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}
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static int max77650_gpio_set_config(struct gpio_chip *gc,
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unsigned int offset, unsigned long cfg)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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switch (pinconf_to_config_param(cfg)) {
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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return regmap_update_bits(chip->map,
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MAX77650_REG_CNFG_GPIO,
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MAX77650_GPIO_DRV_MASK,
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MAX77650_GPIO_DRV_OPEN_DRAIN);
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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return regmap_update_bits(chip->map,
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MAX77650_REG_CNFG_GPIO,
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MAX77650_GPIO_DRV_MASK,
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MAX77650_GPIO_DRV_PUSH_PULL);
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case PIN_CONFIG_INPUT_DEBOUNCE:
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return regmap_update_bits(chip->map,
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MAX77650_REG_CNFG_GPIO,
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MAX77650_GPIO_DEBOUNCE_MASK,
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MAX77650_GPIO_DEBOUNCE);
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default:
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return -ENOTSUPP;
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}
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}
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static int max77650_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
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{
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struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
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return chip->irq;
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}
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static int max77650_gpio_probe(struct platform_device *pdev)
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{
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struct max77650_gpio_chip *chip;
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struct device *dev, *parent;
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struct i2c_client *i2c;
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dev = &pdev->dev;
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parent = dev->parent;
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i2c = to_i2c_client(parent);
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->map = dev_get_regmap(parent, NULL);
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if (!chip->map)
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return -ENODEV;
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chip->irq = platform_get_irq_byname(pdev, "GPI");
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if (chip->irq < 0)
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return chip->irq;
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chip->gc.base = -1;
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chip->gc.ngpio = 1;
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chip->gc.label = i2c->name;
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chip->gc.parent = dev;
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chip->gc.owner = THIS_MODULE;
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chip->gc.can_sleep = true;
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chip->gc.direction_input = max77650_gpio_direction_input;
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chip->gc.direction_output = max77650_gpio_direction_output;
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chip->gc.set = max77650_gpio_set_value;
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chip->gc.get = max77650_gpio_get_value;
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chip->gc.get_direction = max77650_gpio_get_direction;
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chip->gc.set_config = max77650_gpio_set_config;
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chip->gc.to_irq = max77650_gpio_to_irq;
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return devm_gpiochip_add_data(dev, &chip->gc, chip);
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}
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static struct platform_driver max77650_gpio_driver = {
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.driver = {
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.name = "max77650-gpio",
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},
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.probe = max77650_gpio_probe,
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};
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module_platform_driver(max77650_gpio_driver);
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MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
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MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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