diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpio-adp5585.c | 229 |
3 files changed, 237 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 58f43bcced7c..d93cd4f722b4 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1233,6 +1233,13 @@ config GPIO_ADP5520 This option enables support for on-chip GPIO found on Analog Devices ADP5520 PMICs. +config GPIO_ADP5585 + tristate "GPIO Support for ADP5585" + depends on MFD_ADP5585 + help + This option enables support for the GPIO function found in the Analog + Devices ADP5585. + config GPIO_ALTERA_A10SR tristate "Altera Arria10 System Resource GPIO" depends on MFD_ALTERA_A10SR diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 64dd6d9d730d..1429e8c0229b 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o +obj-$(CONFIG_GPIO_ADP5585) += gpio-adp5585.o obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o diff --git a/drivers/gpio/gpio-adp5585.c b/drivers/gpio/gpio-adp5585.c new file mode 100644 index 000000000000..000d31f09671 --- /dev/null +++ b/drivers/gpio/gpio-adp5585.c @@ -0,0 +1,229 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices ADP5585 GPIO driver + * + * Copyright 2022 NXP + * Copyright 2024 Ideas on Board Oy + */ + +#include <linux/device.h> +#include <linux/gpio/driver.h> +#include <linux/mfd/adp5585.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/types.h> + +#define ADP5585_GPIO_MAX 11 + +struct adp5585_gpio_dev { + struct gpio_chip gpio_chip; + struct regmap *regmap; +}; + +static int adp5585_gpio_get_direction(struct gpio_chip *chip, unsigned int off) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + unsigned int val; + + regmap_read(adp5585_gpio->regmap, ADP5585_GPIO_DIRECTION_A + bank, &val); + + return val & bit ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; +} + +static int adp5585_gpio_direction_input(struct gpio_chip *chip, unsigned int off) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + + return regmap_clear_bits(adp5585_gpio->regmap, + ADP5585_GPIO_DIRECTION_A + bank, bit); +} + +static int adp5585_gpio_direction_output(struct gpio_chip *chip, unsigned int off, int val) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + int ret; + + ret = regmap_update_bits(adp5585_gpio->regmap, + ADP5585_GPO_DATA_OUT_A + bank, bit, + val ? bit : 0); + if (ret) + return ret; + + return regmap_set_bits(adp5585_gpio->regmap, + ADP5585_GPIO_DIRECTION_A + bank, bit); +} + +static int adp5585_gpio_get_value(struct gpio_chip *chip, unsigned int off) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + unsigned int reg; + unsigned int val; + + /* + * The input status register doesn't reflect the pin state when the + * GPIO is configured as an output. Check the direction, and read the + * input status from GPI_STATUS or output value from GPO_DATA_OUT + * accordingly. + * + * We don't need any locking, as concurrent access to the same GPIO + * isn't allowed by the GPIO API, so there's no risk of the + * .direction_input(), .direction_output() or .set() operations racing + * with this. + */ + regmap_read(adp5585_gpio->regmap, ADP5585_GPIO_DIRECTION_A + bank, &val); + reg = val & bit ? ADP5585_GPO_DATA_OUT_A : ADP5585_GPI_STATUS_A; + regmap_read(adp5585_gpio->regmap, reg + bank, &val); + + return !!(val & bit); +} + +static void adp5585_gpio_set_value(struct gpio_chip *chip, unsigned int off, int val) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + + regmap_update_bits(adp5585_gpio->regmap, ADP5585_GPO_DATA_OUT_A + bank, + bit, val ? bit : 0); +} + +static int adp5585_gpio_set_bias(struct adp5585_gpio_dev *adp5585_gpio, + unsigned int off, unsigned int bias) +{ + unsigned int bit, reg, mask, val; + + /* + * The bias configuration fields are 2 bits wide and laid down in + * consecutive registers ADP5585_RPULL_CONFIG_*, with a hole of 4 bits + * after R5. + */ + bit = off * 2 + (off > 5 ? 4 : 0); + reg = ADP5585_RPULL_CONFIG_A + bit / 8; + mask = ADP5585_Rx_PULL_CFG_MASK << (bit % 8); + val = bias << (bit % 8); + + return regmap_update_bits(adp5585_gpio->regmap, reg, mask, val); +} + +static int adp5585_gpio_set_drive(struct adp5585_gpio_dev *adp5585_gpio, + unsigned int off, enum pin_config_param drive) +{ + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + + return regmap_update_bits(adp5585_gpio->regmap, + ADP5585_GPO_OUT_MODE_A + bank, bit, + drive == PIN_CONFIG_DRIVE_OPEN_DRAIN ? bit : 0); +} + +static int adp5585_gpio_set_debounce(struct adp5585_gpio_dev *adp5585_gpio, + unsigned int off, unsigned int debounce) +{ + unsigned int bank = ADP5585_BANK(off); + unsigned int bit = ADP5585_BIT(off); + + return regmap_update_bits(adp5585_gpio->regmap, + ADP5585_DEBOUNCE_DIS_A + bank, bit, + debounce ? 0 : bit); +} + +static int adp5585_gpio_set_config(struct gpio_chip *chip, unsigned int off, + unsigned long config) +{ + struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip); + enum pin_config_param param = pinconf_to_config_param(config); + u32 arg = pinconf_to_config_argument(config); + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + return adp5585_gpio_set_bias(adp5585_gpio, off, + ADP5585_Rx_PULL_CFG_DISABLE); + + case PIN_CONFIG_BIAS_PULL_DOWN: + return adp5585_gpio_set_bias(adp5585_gpio, off, arg ? + ADP5585_Rx_PULL_CFG_PD_300K : + ADP5585_Rx_PULL_CFG_DISABLE); + + case PIN_CONFIG_BIAS_PULL_UP: + return adp5585_gpio_set_bias(adp5585_gpio, off, arg ? + ADP5585_Rx_PULL_CFG_PU_300K : + ADP5585_Rx_PULL_CFG_DISABLE); + + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + case PIN_CONFIG_DRIVE_PUSH_PULL: + return adp5585_gpio_set_drive(adp5585_gpio, off, param); + + case PIN_CONFIG_INPUT_DEBOUNCE: + return adp5585_gpio_set_debounce(adp5585_gpio, off, arg); + + default: + return -ENOTSUPP; + }; +} + +static int adp5585_gpio_probe(struct platform_device *pdev) +{ + struct adp5585_dev *adp5585 = dev_get_drvdata(pdev->dev.parent); + struct adp5585_gpio_dev *adp5585_gpio; + struct device *dev = &pdev->dev; + struct gpio_chip *gc; + int ret; + + adp5585_gpio = devm_kzalloc(dev, sizeof(*adp5585_gpio), GFP_KERNEL); + if (!adp5585_gpio) + return -ENOMEM; + + adp5585_gpio->regmap = adp5585->regmap; + + device_set_of_node_from_dev(dev, dev->parent); + + gc = &adp5585_gpio->gpio_chip; + gc->parent = dev; + gc->get_direction = adp5585_gpio_get_direction; + gc->direction_input = adp5585_gpio_direction_input; + gc->direction_output = adp5585_gpio_direction_output; + gc->get = adp5585_gpio_get_value; + gc->set = adp5585_gpio_set_value; + gc->set_config = adp5585_gpio_set_config; + gc->can_sleep = true; + + gc->base = -1; + gc->ngpio = ADP5585_GPIO_MAX; + gc->label = pdev->name; + gc->owner = THIS_MODULE; + + ret = devm_gpiochip_add_data(dev, &adp5585_gpio->gpio_chip, + adp5585_gpio); + if (ret) + return dev_err_probe(dev, ret, "failed to add GPIO chip\n"); + + return 0; +} + +static const struct platform_device_id adp5585_gpio_id_table[] = { + { "adp5585-gpio" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, adp5585_gpio_id_table); + +static struct platform_driver adp5585_gpio_driver = { + .driver = { + .name = "adp5585-gpio", + }, + .probe = adp5585_gpio_probe, + .id_table = adp5585_gpio_id_table, +}; +module_platform_driver(adp5585_gpio_driver); + +MODULE_AUTHOR("Haibo Chen <haibo.chen@nxp.com>"); +MODULE_DESCRIPTION("GPIO ADP5585 Driver"); +MODULE_LICENSE("GPL"); |