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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Dialog DA9062 pinctrl and GPIO driver.
- * Based on DA9055 GPIO driver.
- *
- * TODO:
- * - add pinmux and pinctrl support (gpio alternate mode)
- *
- * Documents:
- * [1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf
- *
- * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
- */
- #include <linux/bits.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #include <linux/gpio/driver.h>
- #include <linux/mfd/da9062/core.h>
- #include <linux/mfd/da9062/registers.h>
- /*
- * We need this get the gpio_desc from a <gpio_chip,offset> tuple to decide if
- * the gpio is active low without a vendor specific dt-binding.
- */
- #include "../gpio/gpiolib.h"
- #define DA9062_TYPE(offset) (4 * (offset % 2))
- #define DA9062_PIN_SHIFT(offset) (4 * (offset % 2))
- #define DA9062_PIN_ALTERNATE 0x00 /* gpio alternate mode */
- #define DA9062_PIN_GPI 0x01 /* gpio in */
- #define DA9062_PIN_GPO_OD 0x02 /* gpio out open-drain */
- #define DA9062_PIN_GPO_PP 0x03 /* gpio out push-pull */
- #define DA9062_GPIO_NUM 5
- struct da9062_pctl {
- struct da9062 *da9062;
- struct gpio_chip gc;
- unsigned int pin_config[DA9062_GPIO_NUM];
- };
- static int da9062_pctl_get_pin_mode(struct da9062_pctl *pctl,
- unsigned int offset)
- {
- struct regmap *regmap = pctl->da9062->regmap;
- int ret, val;
- ret = regmap_read(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), &val);
- if (ret < 0)
- return ret;
- val >>= DA9062_PIN_SHIFT(offset);
- val &= DA9062AA_GPIO0_PIN_MASK;
- return val;
- }
- static int da9062_pctl_set_pin_mode(struct da9062_pctl *pctl,
- unsigned int offset, unsigned int mode_req)
- {
- struct regmap *regmap = pctl->da9062->regmap;
- unsigned int mode = mode_req;
- unsigned int mask;
- int ret;
- mode &= DA9062AA_GPIO0_PIN_MASK;
- mode <<= DA9062_PIN_SHIFT(offset);
- mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset);
- ret = regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
- mask, mode);
- if (!ret)
- pctl->pin_config[offset] = mode_req;
- return ret;
- }
- static int da9062_gpio_get(struct gpio_chip *gc, unsigned int offset)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- struct regmap *regmap = pctl->da9062->regmap;
- int gpio_mode, val;
- int ret;
- gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
- if (gpio_mode < 0)
- return gpio_mode;
- switch (gpio_mode) {
- case DA9062_PIN_ALTERNATE:
- return -ENOTSUPP;
- case DA9062_PIN_GPI:
- ret = regmap_read(regmap, DA9062AA_STATUS_B, &val);
- if (ret < 0)
- return ret;
- break;
- case DA9062_PIN_GPO_OD:
- case DA9062_PIN_GPO_PP:
- ret = regmap_read(regmap, DA9062AA_GPIO_MODE0_4, &val);
- if (ret < 0)
- return ret;
- }
- return !!(val & BIT(offset));
- }
- static void da9062_gpio_set(struct gpio_chip *gc, unsigned int offset,
- int value)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- struct regmap *regmap = pctl->da9062->regmap;
- regmap_update_bits(regmap, DA9062AA_GPIO_MODE0_4, BIT(offset),
- value << offset);
- }
- static int da9062_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- int gpio_mode;
- gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
- if (gpio_mode < 0)
- return gpio_mode;
- switch (gpio_mode) {
- case DA9062_PIN_ALTERNATE:
- return -ENOTSUPP;
- case DA9062_PIN_GPI:
- return GPIO_LINE_DIRECTION_IN;
- case DA9062_PIN_GPO_OD:
- case DA9062_PIN_GPO_PP:
- return GPIO_LINE_DIRECTION_OUT;
- }
- return -EINVAL;
- }
- static int da9062_gpio_direction_input(struct gpio_chip *gc,
- unsigned int offset)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- struct regmap *regmap = pctl->da9062->regmap;
- struct gpio_desc *desc = gpiochip_get_desc(gc, offset);
- unsigned int gpi_type;
- int ret;
- ret = da9062_pctl_set_pin_mode(pctl, offset, DA9062_PIN_GPI);
- if (ret)
- return ret;
- /*
- * If the gpio is active low we should set it in hw too. No worries
- * about gpio_get() because we read and return the gpio-level. So the
- * gpiolib active_low handling is still correct.
- *
- * 0 - active low, 1 - active high
- */
- gpi_type = !gpiod_is_active_low(desc);
- return regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
- DA9062AA_GPIO0_TYPE_MASK << DA9062_TYPE(offset),
- gpi_type << DA9062_TYPE(offset));
- }
- static int da9062_gpio_direction_output(struct gpio_chip *gc,
- unsigned int offset, int value)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- unsigned int pin_config = pctl->pin_config[offset];
- int ret;
- ret = da9062_pctl_set_pin_mode(pctl, offset, pin_config);
- if (ret)
- return ret;
- da9062_gpio_set(gc, offset, value);
- return 0;
- }
- static int da9062_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
- unsigned long config)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- struct regmap *regmap = pctl->da9062->regmap;
- int gpio_mode;
- /*
- * We need to meet the following restrictions [1, Figure 18]:
- * - PIN_CONFIG_BIAS_PULL_DOWN -> only allowed if the pin is used as
- * gpio input
- * - PIN_CONFIG_BIAS_PULL_UP -> only allowed if the pin is used as
- * gpio output open-drain.
- */
- switch (pinconf_to_config_param(config)) {
- case PIN_CONFIG_BIAS_DISABLE:
- return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
- BIT(offset), 0);
- case PIN_CONFIG_BIAS_PULL_DOWN:
- gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
- if (gpio_mode < 0)
- return -EINVAL;
- else if (gpio_mode != DA9062_PIN_GPI)
- return -ENOTSUPP;
- return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
- BIT(offset), BIT(offset));
- case PIN_CONFIG_BIAS_PULL_UP:
- gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
- if (gpio_mode < 0)
- return -EINVAL;
- else if (gpio_mode != DA9062_PIN_GPO_OD)
- return -ENOTSUPP;
- return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
- BIT(offset), BIT(offset));
- case PIN_CONFIG_DRIVE_OPEN_DRAIN:
- return da9062_pctl_set_pin_mode(pctl, offset,
- DA9062_PIN_GPO_OD);
- case PIN_CONFIG_DRIVE_PUSH_PULL:
- return da9062_pctl_set_pin_mode(pctl, offset,
- DA9062_PIN_GPO_PP);
- default:
- return -ENOTSUPP;
- }
- }
- static int da9062_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
- {
- struct da9062_pctl *pctl = gpiochip_get_data(gc);
- struct da9062 *da9062 = pctl->da9062;
- return regmap_irq_get_virq(da9062->regmap_irq,
- DA9062_IRQ_GPI0 + offset);
- }
- static const struct gpio_chip reference_gc = {
- .owner = THIS_MODULE,
- .get = da9062_gpio_get,
- .set = da9062_gpio_set,
- .get_direction = da9062_gpio_get_direction,
- .direction_input = da9062_gpio_direction_input,
- .direction_output = da9062_gpio_direction_output,
- .set_config = da9062_gpio_set_config,
- .to_irq = da9062_gpio_to_irq,
- .can_sleep = true,
- .ngpio = DA9062_GPIO_NUM,
- .base = -1,
- };
- static int da9062_pctl_probe(struct platform_device *pdev)
- {
- struct device *parent = pdev->dev.parent;
- struct da9062_pctl *pctl;
- int i;
- pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
- if (!pctl)
- return -ENOMEM;
- pctl->da9062 = dev_get_drvdata(parent);
- if (!pctl->da9062)
- return -EINVAL;
- if (!device_property_present(parent, "gpio-controller"))
- return 0;
- for (i = 0; i < ARRAY_SIZE(pctl->pin_config); i++)
- pctl->pin_config[i] = DA9062_PIN_GPO_PP;
- /*
- * Currently the driver handles only the GPIO support. The
- * pinctrl/pinmux support can be added later if needed.
- */
- pctl->gc = reference_gc;
- pctl->gc.label = dev_name(&pdev->dev);
- pctl->gc.parent = &pdev->dev;
- #ifdef CONFIG_OF_GPIO
- pctl->gc.of_node = parent->of_node;
- #endif
- platform_set_drvdata(pdev, pctl);
- return devm_gpiochip_add_data(&pdev->dev, &pctl->gc, pctl);
- }
- static struct platform_driver da9062_pctl_driver = {
- .probe = da9062_pctl_probe,
- .driver = {
- .name = "da9062-gpio",
- },
- };
- module_platform_driver(da9062_pctl_driver);
- MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>");
- MODULE_DESCRIPTION("DA9062 PMIC pinctrl and GPIO Driver");
- MODULE_LICENSE("GPL v2");
- MODULE_ALIAS("platform:da9062-gpio");
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