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#include <linux/gpio.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#define SC18IS600_REG_IO_CONFIG 0x00
#define SC18IS600_REG_IO_STATE 0x01
#define SC18IS600_REG_IO_CONFIG2 0x07 /* only cp2120 */
struct gpio_sc18is600 {
struct gpio_chip chip;
struct regmap *regmap;
};
static int sc18is600_mode(struct gpio_sc18is600 *sc18is600, u8 gpio, u8 mode)
{
u8 reg = (gpio <= 4) ?
SC18IS600_REG_IO_CONFIG : SC18IS600_REG_IO_CONFIG2;
u8 mask = (0x03 << (gpio % 4));
u8 val = (mode << (gpio % 4));
return regmap_update_bits(sc18is600->regmap, reg, mask, val);
}
void sc18is600_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct gpio_sc18is600 *sc18is600 = gpiochip_get_data(chip);
u8 reg = SC18IS600_REG_IO_STATE;
u8 mask = (1 << offset);
u8 val = value ? 0xff : 0x00;
int err;
err = regmap_update_bits(sc18is600->regmap, reg, mask, val);
if (err)
dev_err(chip->parent, "regmap failed: %d", err);
}
static int sc18is600_get(struct gpio_chip *chip, unsigned offset)
{
struct gpio_sc18is600 *sc18is600 = gpiochip_get_data(chip);
u8 reg = SC18IS600_REG_IO_STATE;
u8 mask = (1 << offset);
int val, err;
err = regmap_read(sc18is600->regmap, reg, &val);
if (err) {
dev_err(chip->parent, "regmap failed: %d", err);
return err;
}
return val & mask;
}
static int sc18is600_input(struct gpio_chip *chip, unsigned offset)
{
struct gpio_sc18is600 *sc18is600 = gpiochip_get_data(chip);
/* input only mode */
return sc18is600_mode(sc18is600, offset, 0x01);
}
static int sc18is600_output(struct gpio_chip *chip, unsigned offset, int value)
{
struct gpio_sc18is600 *sc18is600 = gpiochip_get_data(chip);
int err;
/* push-pull mode */
err = sc18is600_mode(sc18is600, offset, 0x02);
if (err)
return err;
sc18is600_set(chip, offset, value);
return 0;
}
static int gpio_sc18is600_probe(struct platform_device *pdev)
{
struct gpio_sc18is600 *sc18is600;
u8 *chiptype = dev_get_platdata(&pdev->dev);
int err;
sc18is600 = devm_kzalloc(&pdev->dev, sizeof(*sc18is600), GFP_KERNEL);
if (!sc18is600)
return -ENOMEM;
sc18is600->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!sc18is600->regmap) {
dev_err(&pdev->dev, "missing regmap!");
return -ENODEV;
}
if (!chiptype || *chiptype > 0x02) {
dev_err(&pdev->dev, "missing chiptype!");
return -ENXIO;
}
sc18is600->chip.base = -1;
sc18is600->chip.direction_input = sc18is600_input;
sc18is600->chip.get = sc18is600_get;
sc18is600->chip.direction_output = sc18is600_output;
sc18is600->chip.set = sc18is600_set;
sc18is600->chip.can_sleep = true;
sc18is600->chip.parent = &pdev->dev;
sc18is600->chip.owner = THIS_MODULE;
if (*chiptype == 0x02) {
sc18is600->chip.ngpio = 8;
sc18is600->chip.label = "cp2120";
} else {
sc18is600->chip.ngpio = 4;
sc18is600->chip.label = "sc18is600";
}
err = devm_gpiochip_add_data(&pdev->dev, &sc18is600->chip, sc18is600);
if (err)
dev_err(&pdev->dev, "failed to add gpiochip: %d", err);
return err;
}
static struct platform_driver sc18is600_driver = {
.driver = {
.name = "gpio-sc18is600",
},
.probe = gpio_sc18is600_probe,
};
module_platform_driver(sc18is600_driver);
MODULE_ALIAS("platform:gpio-sc18is600");
MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
MODULE_DESCRIPTION("NXP SC18IS600 GPIO interface");
MODULE_LICENSE("GPL");
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