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gpio: Initial support for ROHM bd70528 GPIO block
ROHM BD70528 PMIC has 4 GPIO pins. Allow them to be controlled by GPIO framework. IRQs are handled by regmap-irq and GPIO driver is not aware of the irq usage. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Matti Vaittinen
Lee Jones
parent
478bb8f32e
commit
18bc64b3ae
@ -977,6 +977,17 @@ config GPIO_ARIZONA
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help
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Support for GPIOs on Wolfson Arizona class devices.
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config GPIO_BD70528
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tristate "ROHM BD70528 GPIO support"
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depends on MFD_ROHM_BD70528
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help
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Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
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available on the ROHM PMIC in total. The GPIOs can also
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generate interrupts.
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This driver can also be built as a module. If so, the module
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will be called gpio-bd70528.
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config GPIO_BD9571MWV
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tristate "ROHM BD9571 GPIO support"
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depends on MFD_BD9571MWV
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@ -35,6 +35,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
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obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o
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obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o
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obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
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obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o
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obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o
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obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
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obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
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232
drivers/gpio/gpio-bd70528.c
Normal file
232
drivers/gpio/gpio-bd70528.c
Normal file
@ -0,0 +1,232 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 ROHM Semiconductors
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// gpio-bd70528.c ROHM BD70528MWV gpio driver
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#include <linux/gpio/driver.h>
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#include <linux/mfd/rohm-bd70528.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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#define GPIO_IN_REG(offset) (BD70528_REG_GPIO1_IN + (offset) * 2)
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#define GPIO_OUT_REG(offset) (BD70528_REG_GPIO1_OUT + (offset) * 2)
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struct bd70528_gpio {
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struct rohm_regmap_dev chip;
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struct gpio_chip gpio;
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};
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static int bd70528_set_debounce(struct bd70528_gpio *bdgpio,
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unsigned int offset, unsigned int debounce)
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{
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u8 val;
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switch (debounce) {
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case 0:
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val = BD70528_DEBOUNCE_DISABLE;
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break;
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case 1 ... 15:
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val = BD70528_DEBOUNCE_15MS;
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break;
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case 16 ... 30:
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val = BD70528_DEBOUNCE_30MS;
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break;
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case 31 ... 50:
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val = BD70528_DEBOUNCE_50MS;
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break;
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default:
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dev_err(bdgpio->chip.dev,
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"Invalid debouce value %u\n", debounce);
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return -EINVAL;
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}
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return regmap_update_bits(bdgpio->chip.regmap, GPIO_IN_REG(offset),
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BD70528_DEBOUNCE_MASK, val);
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}
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static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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int val, ret;
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/* Do we need to do something to IRQs here? */
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ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
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if (ret) {
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dev_err(bdgpio->chip.dev, "Could not read gpio direction\n");
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return ret;
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}
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return !(val & BD70528_GPIO_OUT_EN_MASK);
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}
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static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
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unsigned long config)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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switch (pinconf_to_config_param(config)) {
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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return regmap_update_bits(bdgpio->chip.regmap,
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GPIO_OUT_REG(offset),
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BD70528_GPIO_DRIVE_MASK,
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BD70528_GPIO_OPEN_DRAIN);
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break;
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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return regmap_update_bits(bdgpio->chip.regmap,
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GPIO_OUT_REG(offset),
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BD70528_GPIO_DRIVE_MASK,
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BD70528_GPIO_PUSH_PULL);
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break;
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case PIN_CONFIG_INPUT_DEBOUNCE:
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return bd70528_set_debounce(bdgpio, offset,
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pinconf_to_config_argument(config));
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break;
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default:
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break;
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}
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return -ENOTSUPP;
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}
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static int bd70528_direction_input(struct gpio_chip *chip, unsigned int offset)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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/* Do we need to do something to IRQs here? */
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return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
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BD70528_GPIO_OUT_EN_MASK,
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BD70528_GPIO_OUT_DISABLE);
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}
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static void bd70528_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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int ret;
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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u8 val = (value) ? BD70528_GPIO_OUT_HI : BD70528_GPIO_OUT_LO;
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ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
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BD70528_GPIO_OUT_MASK, val);
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if (ret)
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dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
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}
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static int bd70528_direction_output(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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bd70528_gpio_set(chip, offset, value);
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return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
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BD70528_GPIO_OUT_EN_MASK,
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BD70528_GPIO_OUT_ENABLE);
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}
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#define GPIO_IN_STATE_MASK(offset) (BD70528_GPIO_IN_STATE_BASE << (offset))
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static int bd70528_gpio_get_o(struct bd70528_gpio *bdgpio, unsigned int offset)
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{
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int ret;
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unsigned int val;
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ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
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if (!ret)
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ret = !!(val & BD70528_GPIO_OUT_MASK);
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else
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dev_err(bdgpio->chip.dev, "GPIO (out) state read failed\n");
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return ret;
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}
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static int bd70528_gpio_get_i(struct bd70528_gpio *bdgpio, unsigned int offset)
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{
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unsigned int val;
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int ret;
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ret = regmap_read(bdgpio->chip.regmap, BD70528_REG_GPIO_STATE, &val);
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if (!ret)
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ret = !(val & GPIO_IN_STATE_MASK(offset));
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else
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dev_err(bdgpio->chip.dev, "GPIO (in) state read failed\n");
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return ret;
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}
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static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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int ret = -EINVAL;
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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/*
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* There is a race condition where someone might be changing the
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* GPIO direction after we get it but before we read the value. But
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* application design where GPIO direction may be changed just when
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* we read GPIO value would be pointless as reader could not know
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* whether the returned high/low state is caused by input or output.
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* Or then there must be other ways to mitigate the issue. Thus
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* locking would make no sense.
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*/
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ret = bd70528_get_direction(chip, offset);
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if (ret == 0)
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ret = bd70528_gpio_get_o(bdgpio, offset);
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else if (ret == 1)
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ret = bd70528_gpio_get_i(bdgpio, offset);
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else
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dev_err(bdgpio->chip.dev, "failed to read GPIO direction\n");
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return ret;
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}
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static int bd70528_probe(struct platform_device *pdev)
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{
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struct bd70528_gpio *bdgpio;
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struct rohm_regmap_dev *bd70528;
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int ret;
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bd70528 = dev_get_drvdata(pdev->dev.parent);
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if (!bd70528) {
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dev_err(&pdev->dev, "No MFD driver data\n");
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return -EINVAL;
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}
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bdgpio = devm_kzalloc(&pdev->dev, sizeof(*bdgpio),
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GFP_KERNEL);
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if (!bdgpio)
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return -ENOMEM;
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bdgpio->chip.dev = &pdev->dev;
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bdgpio->gpio.parent = pdev->dev.parent;
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bdgpio->gpio.label = "bd70528-gpio";
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bdgpio->gpio.owner = THIS_MODULE;
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bdgpio->gpio.get_direction = bd70528_get_direction;
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bdgpio->gpio.direction_input = bd70528_direction_input;
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bdgpio->gpio.direction_output = bd70528_direction_output;
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bdgpio->gpio.set_config = bd70528_gpio_set_config;
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bdgpio->gpio.can_sleep = true;
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bdgpio->gpio.get = bd70528_gpio_get;
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bdgpio->gpio.set = bd70528_gpio_set;
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bdgpio->gpio.ngpio = 4;
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bdgpio->gpio.base = -1;
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#ifdef CONFIG_OF_GPIO
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bdgpio->gpio.of_node = pdev->dev.parent->of_node;
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#endif
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bdgpio->chip.regmap = bd70528->regmap;
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ret = devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
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bdgpio);
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if (ret)
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dev_err(&pdev->dev, "gpio_init: Failed to add bd70528-gpio\n");
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return ret;
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}
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static struct platform_driver bd70528_gpio = {
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.driver = {
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.name = "bd70528-gpio"
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},
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.probe = bd70528_probe,
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};
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module_platform_driver(bd70528_gpio);
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_DESCRIPTION("BD70528 voltage regulator driver");
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MODULE_LICENSE("GPL");
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