diff options
Diffstat (limited to 'drivers/gpio/gpio-tps65218.c')
| -rw-r--r-- | drivers/gpio/gpio-tps65218.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tps65218.c b/drivers/gpio/gpio-tps65218.c new file mode 100644 index 000000000000..313c0e484607 --- /dev/null +++ b/drivers/gpio/gpio-tps65218.c @@ -0,0 +1,222 @@ +/* + * Copyright 2015 Verifone Int. + * + * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com> + * + * This program is free software; you can redistribute it and/or modify i t + * under the terms of the GNU General Public License as published by th e + * Free Software Foundation; either version 2 of the License, or (at you r + * option) any later version. + * + * This driver is based on the gpio-tps65912 implementation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/gpio/driver.h> +#include <linux/platform_device.h> +#include <linux/mfd/tps65218.h> + +struct tps65218_gpio { + struct tps65218 *tps65218; + struct gpio_chip gpio_chip; +}; + +static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); + struct tps65218 *tps65218 = tps65218_gpio->tps65218; + unsigned int val; + int ret; + + ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val); + if (ret) + return ret; + + return !!(val & (TPS65218_ENABLE2_GPIO1 << offset)); +} + +static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); + struct tps65218 *tps65218 = tps65218_gpio->tps65218; + + if (value) + tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2, + TPS65218_ENABLE2_GPIO1 << offset, + TPS65218_ENABLE2_GPIO1 << offset, + TPS65218_PROTECT_L1); + else + tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2, + TPS65218_ENABLE2_GPIO1 << offset, + TPS65218_PROTECT_L1); +} + +static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + /* Only drives GPOs */ + tps65218_gpio_set(gc, offset, value); + return 0; +} + +static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset) +{ + return -EPERM; +} + +static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset) +{ + struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); + struct tps65218 *tps65218 = tps65218_gpio->tps65218; + int ret; + + if (gpiochip_line_is_open_source(gc, offset)) { + dev_err(gc->parent, "can't work as open source\n"); + return -EINVAL; + } + + switch (offset) { + case 0: + if (!gpiochip_line_is_open_drain(gc, offset)) { + dev_err(gc->parent, "GPO1 works only as open drain\n"); + return -EINVAL; + } + + /* Disable sequencer for GPO1 */ + ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, + TPS65218_SEQ7_GPO1_SEQ_MASK, + TPS65218_PROTECT_L1); + if (ret) + return ret; + + /* Setup GPO1 */ + ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, + TPS65218_CONFIG1_IO1_SEL, + TPS65218_PROTECT_L1); + if (ret) + return ret; + + break; + case 1: + /* GP02 is push-pull by default, can be set as open drain. */ + if (gpiochip_line_is_open_drain(gc, offset)) { + ret = tps65218_clear_bits(tps65218, + TPS65218_REG_CONFIG1, + TPS65218_CONFIG1_GPO2_BUF, + TPS65218_PROTECT_L1); + if (ret) + return ret; + } + + /* Setup GPO2 */ + ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, + TPS65218_CONFIG1_IO1_SEL, + TPS65218_PROTECT_L1); + if (ret) + return ret; + + break; + + case 2: + if (!gpiochip_line_is_open_drain(gc, offset)) { + dev_err(gc->parent, "GPO3 works only as open drain\n"); + return -EINVAL; + } + + /* Disable sequencer for GPO3 */ + ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, + TPS65218_SEQ7_GPO3_SEQ_MASK, + TPS65218_PROTECT_L1); + if (ret) + return ret; + + /* Setup GPO3 */ + ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2, + TPS65218_CONFIG2_DC12_RST, + TPS65218_PROTECT_L1); + if (ret) + return ret; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static struct gpio_chip template_chip = { + .label = "gpio-tps65218", + .owner = THIS_MODULE, + .request = tps65218_gpio_request, + .direction_output = tps65218_gpio_output, + .direction_input = tps65218_gpio_input, + .get = tps65218_gpio_get, + .set = tps65218_gpio_set, + .can_sleep = true, + .ngpio = 3, + .base = -1, +}; + +static int tps65218_gpio_probe(struct platform_device *pdev) +{ + struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent); + struct tps65218_gpio *tps65218_gpio; + int ret; + + tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio), + GFP_KERNEL); + if (!tps65218_gpio) + return -ENOMEM; + + tps65218_gpio->tps65218 = tps65218; + tps65218_gpio->gpio_chip = template_chip; + tps65218_gpio->gpio_chip.parent = &pdev->dev; +#ifdef CONFIG_OF_GPIO + tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node; +#endif + + ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, tps65218_gpio); + + return ret; +} + +static int tps65218_gpio_remove(struct platform_device *pdev) +{ + struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev); + + gpiochip_remove(&tps65218_gpio->gpio_chip); + + return 0; +} + +static const struct of_device_id tps65218_dt_match[] = { + { .compatible = "ti,tps65218-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(of, tps65218_dt_match); + +static struct platform_driver tps65218_gpio_driver = { + .driver = { + .name = "tps65218-gpio", + .of_match_table = of_match_ptr(tps65218_dt_match) + }, + .probe = tps65218_gpio_probe, + .remove = tps65218_gpio_remove, +}; + +module_platform_driver(tps65218_gpio_driver); + +MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>"); +MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:tps65218-gpio"); |