diff options
Diffstat (limited to 'drivers/gpio/gpio-tps65910.c')
| -rw-r--r-- | drivers/gpio/gpio-tps65910.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tps65910.c b/drivers/gpio/gpio-tps65910.c new file mode 100644 index 000000000..321e6945f --- /dev/null +++ b/drivers/gpio/gpio-tps65910.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * TI TPS6591x GPIO driver + * + * Copyright 2010 Texas Instruments Inc. + * + * Author: Graeme Gregory <gg@slimlogic.co.uk> + * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/gpio/driver.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/mfd/tps65910.h> +#include <linux/of_device.h> + +struct tps65910_gpio { + struct gpio_chip gpio_chip; + struct tps65910 *tps65910; +}; + +static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); + struct tps65910 *tps65910 = tps65910_gpio->tps65910; + unsigned int val; + + regmap_read(tps65910->regmap, TPS65910_GPIO0 + offset, &val); + + if (val & GPIO_STS_MASK) + return 1; + + return 0; +} + +static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); + struct tps65910 *tps65910 = tps65910_gpio->tps65910; + + if (value) + regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset, + GPIO_SET_MASK); + else + regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset, + GPIO_SET_MASK); +} + +static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); + struct tps65910 *tps65910 = tps65910_gpio->tps65910; + + /* Set the initial value */ + tps65910_gpio_set(gc, offset, value); + + return regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset, + GPIO_CFG_MASK); +} + +static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset) +{ + struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); + struct tps65910 *tps65910 = tps65910_gpio->tps65910; + + return regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset, + GPIO_CFG_MASK); +} + +#ifdef CONFIG_OF +static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev, + struct tps65910 *tps65910, int chip_ngpio) +{ + struct tps65910_board *tps65910_board = tps65910->of_plat_data; + unsigned int prop_array[TPS6591X_MAX_NUM_GPIO]; + int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO); + int ret; + int idx; + + tps65910_board->gpio_base = -1; + ret = of_property_read_u32_array(tps65910->dev->of_node, + "ti,en-gpio-sleep", prop_array, ngpio); + if (ret < 0) { + dev_dbg(dev, "ti,en-gpio-sleep not specified\n"); + return tps65910_board; + } + + for (idx = 0; idx < ngpio; idx++) + tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0); + + return tps65910_board; +} +#else +static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev, + struct tps65910 *tps65910, int chip_ngpio) +{ + return NULL; +} +#endif + +static int tps65910_gpio_probe(struct platform_device *pdev) +{ + struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent); + struct tps65910_board *pdata = dev_get_platdata(tps65910->dev); + struct tps65910_gpio *tps65910_gpio; + int ret; + int i; + + device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); + + tps65910_gpio = devm_kzalloc(&pdev->dev, + sizeof(*tps65910_gpio), GFP_KERNEL); + if (!tps65910_gpio) + return -ENOMEM; + + tps65910_gpio->tps65910 = tps65910; + + tps65910_gpio->gpio_chip.owner = THIS_MODULE; + tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name; + + switch (tps65910_chip_id(tps65910)) { + case TPS65910: + tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO; + break; + case TPS65911: + tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO; + break; + default: + return -EINVAL; + } + tps65910_gpio->gpio_chip.can_sleep = true; + tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input; + tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output; + tps65910_gpio->gpio_chip.set = tps65910_gpio_set; + tps65910_gpio->gpio_chip.get = tps65910_gpio_get; + tps65910_gpio->gpio_chip.parent = &pdev->dev; + + if (pdata && pdata->gpio_base) + tps65910_gpio->gpio_chip.base = pdata->gpio_base; + else + tps65910_gpio->gpio_chip.base = -1; + + if (!pdata && tps65910->dev->of_node) + pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910, + tps65910_gpio->gpio_chip.ngpio); + + if (!pdata) + goto skip_init; + + /* Configure sleep control for gpios if provided */ + for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) { + if (!pdata->en_gpio_sleep[i]) + continue; + + ret = regmap_set_bits(tps65910->regmap, + TPS65910_GPIO0 + i, GPIO_SLEEP_MASK); + if (ret < 0) + dev_warn(tps65910->dev, + "GPIO Sleep setting failed with err %d\n", ret); + } + +skip_init: + return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip, + tps65910_gpio); +} + +static struct platform_driver tps65910_gpio_driver = { + .driver.name = "tps65910-gpio", + .probe = tps65910_gpio_probe, +}; + +static int __init tps65910_gpio_init(void) +{ + return platform_driver_register(&tps65910_gpio_driver); +} +subsys_initcall(tps65910_gpio_init); 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