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gpio: lp873x: Add support for General Purpose Outputs
Add driver for lp873x PMIC family GPOs. Two GPOs are supported and can be configured in Open-drain output or Push-pull output. Signed-off-by: Keerthy <j-keerthy@ti.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Keerthy
Lee Jones
parent
dc21c7ad3a
commit
83f141030c
@ -874,6 +874,16 @@ config GPIO_LP3943
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LP3943 can be used as a GPIO expander which provides up to 16 GPIOs.
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Open drain outputs are required for this usage.
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config GPIO_LP873X
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tristate "TI LP873X GPO"
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depends on MFD_TI_LP873X
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help
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This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present
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on LP873X PMICs.
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This driver can also be built as a module. If so, the module will be
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called gpio-lp873x.
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config GPIO_MAX77620
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tristate "GPIO support for PMIC MAX77620 and MAX20024"
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depends on MFD_MAX77620
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@ -56,6 +56,7 @@ obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o
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obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
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obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o
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obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o
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obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o
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obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o
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obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o
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obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o
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193
drivers/gpio/gpio-lp873x.c
Normal file
193
drivers/gpio/gpio-lp873x.c
Normal file
@ -0,0 +1,193 @@
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/*
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* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
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* Keerthy <j-keerthy@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether expressed or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*
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* Based on the TPS65218 driver
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*/
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#include <linux/gpio.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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#include <linux/mfd/lp873x.h>
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#define BITS_PER_GPO 0x4
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#define LP873X_GPO_CTRL_OD 0x2
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struct lp873x_gpio {
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struct gpio_chip chip;
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struct lp873x *lp873;
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};
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static int lp873x_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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/* This device is output only */
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return 0;
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}
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static int lp873x_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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/* This device is output only */
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return -EINVAL;
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}
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static int lp873x_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(chip);
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/* Set the initial value */
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return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO),
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value ? BIT(offset * BITS_PER_GPO) : 0);
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}
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static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val);
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if (ret < 0)
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return ret;
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return val & BIT(offset * BITS_PER_GPO);
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}
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static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO),
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value ? BIT(offset * BITS_PER_GPO) : 0);
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}
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static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(gc);
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int ret;
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switch (offset) {
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case 0:
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/* No MUX Set up Needed for GPO */
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break;
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case 1:
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/* Setup the CLKIN_PIN_SEL MUX to GPO2 */
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ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG,
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LP873X_CONFIG_CLKIN_PIN_SEL, 0);
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if (ret)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int lp873x_gpio_set_single_ended(struct gpio_chip *gc,
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unsigned int offset,
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enum single_ended_mode mode)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(gc);
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switch (mode) {
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case LINE_MODE_OPEN_DRAIN:
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return regmap_update_bits(gpio->lp873->regmap,
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LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_OD),
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_OD));
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case LINE_MODE_PUSH_PULL:
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return regmap_update_bits(gpio->lp873->regmap,
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LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_OD), 0);
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default:
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return -ENOTSUPP;
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}
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}
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static struct gpio_chip template_chip = {
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.label = "lp873x-gpio",
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.owner = THIS_MODULE,
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.request = lp873x_gpio_request,
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.get_direction = lp873x_gpio_get_direction,
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.direction_input = lp873x_gpio_direction_input,
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.direction_output = lp873x_gpio_direction_output,
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.get = lp873x_gpio_get,
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.set = lp873x_gpio_set,
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.set_single_ended = lp873x_gpio_set_single_ended,
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.base = -1,
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.ngpio = 2,
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.can_sleep = true,
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};
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static int lp873x_gpio_probe(struct platform_device *pdev)
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{
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struct lp873x_gpio *gpio;
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int ret;
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gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
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if (!gpio)
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return -ENOMEM;
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platform_set_drvdata(pdev, gpio);
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gpio->lp873 = dev_get_drvdata(pdev->dev.parent);
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gpio->chip = template_chip;
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gpio->chip.parent = gpio->lp873->dev;
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ret = gpiochip_add_data(&gpio->chip, gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int lp873x_gpio_remove(struct platform_device *pdev)
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{
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struct lp873x_gpio *gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&gpio->chip);
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return 0;
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}
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static const struct platform_device_id lp873x_gpio_id_table[] = {
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{ "lp873x-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table);
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static struct platform_driver lp873x_gpio_driver = {
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.driver = {
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.name = "lp873x-gpio",
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},
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.probe = lp873x_gpio_probe,
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.remove = lp873x_gpio_remove,
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.id_table = lp873x_gpio_id_table,
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};
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module_platform_driver(lp873x_gpio_driver);
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MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("LP873X GPIO driver");
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MODULE_LICENSE("GPL v2");
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