From: Eric Jeong <eric.jeong.opensource@xxxxxxxxxxx> This patch adds support for PV88080 PMIC GPIOs. PV88080 has two configurable GPIOs. Kconfig and Makefile are updated to reflect support for PV88080 PMIC GPIO. Signed-off-by: Eric Jeong <eric.jeong.opensource@xxxxxxxxxxx> --- This patch applies against linux-next and next-20161117 Hi, Change since PATCH V2 - Add the set_single_ended function - Add property reading function - Simplify and clarfy the funcion of gpio_chip Change since PATCH V1 - Patch separated from PATCH V1 Regards, Eric Jeong, Dialog Semiconductor Ltd. drivers/gpio/Kconfig | 11 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-pv88080.c | 213 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 225 insertions(+) create mode 100644 drivers/gpio/gpio-pv88080.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index a9a1c8a..cb11686 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -949,6 +949,17 @@ config GPIO_PALMAS Select this option to enable GPIO driver for the TI PALMAS series chip family. +config GPIO_PV88080 + tristate "Powerventure Semiconductor PV88080 GPIO" + depends on MFD_PV88080 + help + Support for GPIO pins on PV88080 PMIC. + + Say yes here to enable the GPIO driver for the PV88080 chip. + + The Powerventure PMIC chip has 2 GPIO pins that can be + controlled by this driver. + config GPIO_RC5T583 bool "RICOH RC5T583 GPIO" depends on MFD_RC5T583 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 8043a95..2a2311e 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -92,6 +92,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o obj-$(CONFIG_GPIO_PCH) += gpio-pch.o obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o +obj-$(CONFIG_GPIO_PV88080) += gpio-pv88080.o obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o diff --git a/drivers/gpio/gpio-pv88080.c b/drivers/gpio/gpio-pv88080.c new file mode 100644 index 0000000..6f4734f --- /dev/null +++ b/drivers/gpio/gpio-pv88080.c @@ -0,0 +1,213 @@ +/* + * gpio-pv88080.c - GPIO device driver for PV88080 + * Copyright (C) 2016 Powerventure Semiconductor Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/gpio.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/bitops.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +#include <linux/mfd/pv88080.h> + +#define PV88080_PORT_DIRECTION_INPUT 0 +#define PV88080_PORT_DIRECTION_OUTPUT 1 + +struct pv88080_gpio { + struct pv88080 *chip; + struct gpio_chip gpio_chip; + unsigned int input_reg; + unsigned int output_reg; + unsigned int gpio_base_reg; +}; + +static int pv88080_gpio_get_direction(struct gpio_chip *gc, + unsigned int offset) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + unsigned int value; + int ret; + + ret = regmap_read(chip->regmap, priv->gpio_base_reg + offset, &value); + if (ret) + return ret; + + value = !(value & PV88080_GPIO_DIRECTION_MASK); + + return value; +} + +static int pv88080_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + + return regmap_update_bits(chip->regmap, priv->gpio_base_reg + offset, + PV88080_GPIO_DIRECTION_MASK, 0); +} + +static int pv88080_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + + return regmap_update_bits(chip->regmap, priv->gpio_base_reg + offset, + PV88080_GPIO_DIRECTION_MASK, 1); +} + +static int pv88080_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + unsigned int reg, value; + int ret; + + ret = regmap_read(chip->regmap, priv->gpio_base_reg + offset, &value); + if (ret < 0) + return ret; + + if (value & PV88080_GPIO_DIRECTION_MASK) + reg = priv->output_reg; + else + reg = priv->input_reg; + + ret = regmap_read(chip->regmap, reg, &value); + if (ret < 0) + return ret; + + value = !!(value & BIT(offset)); + + return value; +} + +static void pv88080_gpio_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + int ret; + + ret = regmap_update_bits(chip->regmap, priv->output_reg, + BIT(offset), (value << offset)); + if (ret < 0) + dev_err(chip->dev, "Failed to update gpio\n"); +} + +static int pv88080_set_single_ended(struct gpio_chip *gc, + unsigned int offset, + enum single_ended_mode mode) +{ + struct pv88080_gpio *priv = gpiochip_get_data(gc); + struct pv88080 *chip = priv->chip; + int ret; + + switch (mode) { + case LINE_MODE_OPEN_DRAIN: + ret = regmap_update_bits(chip->regmap, + priv->gpio_base_reg + offset, + PV88080_GPIO_SINGLE_ENDED_MASK, 0); + break; + case LINE_MODE_PUSH_PULL: + ret = regmap_update_bits(chip->regmap, + priv->gpio_base_reg + offset, + PV88080_GPIO_SINGLE_ENDED_MASK, 1 << 1); + break; + default: + ret = -ENOTSUPP; + break; + } + + return ret; +} + +static const struct gpio_chip template_gpio = { + .label = "pv88080-gpio", + .owner = THIS_MODULE, + .get_direction = pv88080_gpio_get_direction, + .direction_input = pv88080_gpio_direction_input, + .direction_output = pv88080_gpio_direction_output, + .get = pv88080_gpio_get, + .set = pv88080_gpio_set, + .set_single_ended = pv88080_set_single_ended, + .base = -1, + .ngpio = 2, +}; + +static const struct of_device_id pv88080_gpio_of_match[] = { + { .compatible = "pvs,pv88080-gpio", }, + { }, +}; +MODULE_DEVICE_TABLE(of, pv88080_gpio_of_match); + +static int pv88080_gpio_probe(struct platform_device *pdev) +{ + struct pv88080 *chip = dev_get_drvdata(pdev->dev.parent); + struct pv88080_gpio *priv; + struct device_node *np = pdev->dev.of_node; + u32 ngpios; + int ret; + + priv = devm_kzalloc(&pdev->dev, + sizeof(struct pv88080_gpio), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->chip = chip; + priv->gpio_chip = template_gpio; + priv->gpio_chip.parent = &pdev->dev; + + switch (chip->type) { + case TYPE_PV88080_AA: + priv->input_reg = PV88080AA_REG_GPIO_INPUT; + priv->output_reg = PV88080AA_REG_GPIO_OUTPUT; + priv->gpio_base_reg = PV88080AA_REG_GPIO_GPIO0; + break; + case TYPE_PV88080_BA: + priv->input_reg = PV88080BA_REG_GPIO_INPUT; + priv->output_reg = PV88080BA_REG_GPIO_OUTPUT; + priv->gpio_base_reg = PV88080BA_REG_GPIO_GPIO0; + break; + } + + if (!of_property_read_u32(np, "ngpios", &ngpios)) + priv->gpio_chip.ngpio = ngpios; + + ret = devm_gpiochip_add_data(&pdev->dev, &priv->gpio_chip, priv); + if (ret < 0) { + dev_err(&pdev->dev, "Unable to register gpiochip\n"); + return ret; + } + + platform_set_drvdata(pdev, priv); + + return 0; +} + +static struct platform_driver pv88080_gpio_driver = { + .driver = { + .name = "pv88080-gpio", + .of_match_table = of_match_ptr(pv88080_gpio_of_match), + }, + .probe = pv88080_gpio_probe, +}; +module_platform_driver(pv88080_gpio_driver); + +MODULE_AUTHOR("Eric Jeong <eric.jeong.opensource@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("GPIO device driver for Powerventure PV88080"); +MODULE_LICENSE("GPL"); + -- end-of-patch for RESEND PATCH V3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html