[PATCH v6 08/12] gpio: Add GPIO driver for the RK805 PMIC

Jianhong Chen
2017-06-08T07:31:36Z

From: chenjh <chenjh@rock-chips.com>

RK805 has two configurable GPIOs that can be used for several
purposes. These are output only.

This driver is generic for other Rockchip PMICs to be added.

Signed-off-by: chenjh <chenjh@rock-chips.com>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-rk805.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 241 insertions(+)
create mode 100644 drivers/gpio/gpio-rk805.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0504307..c8cca89 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -974,6 +974,12 @@ config GPIO_RC5T583
This driver provides the support for driving/reading the gpio pins
of RC5T583 device through standard gpio library.

+config GPIO_RK805
+ bool "Rockchip RK805 GPIO"
+ depends on MFD_RK808
+ help
+ Select this option to enable GPIO driver for the RK805 PMIC.
+
config GPIO_STMPE
bool "STMPE GPIOs"
depends on MFD_STMPE
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index becb96c..55ba941 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -99,6 +99,7 @@ obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
obj-$(CONFIG_GPIO_RCAR) += gpio-rcar.o
+obj-$(CONFIG_GPIO_RK805) += gpio-rk805.o
obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
obj-$(CONFIG_GPIO_SCH) += gpio-sch.o
obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o
diff --git a/drivers/gpio/gpio-rk805.c b/drivers/gpio/gpio-rk805.c
new file mode 100644
index 0000000..bc17c92
--- /dev/null
+++ b/drivers/gpio/gpio-rk805.c
@@ -0,0 +1,234 @@
+/*
+ * GPIO driver for Rockchip RK805 PMIC
+ *
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chen Jianhong <chenjh@rock-chips.com>
+ *
+ * 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.
+ *
+ * Based on the TPS65218 driver
+ */
+
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/mfd/rk808.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* rk805 */
+#define RK805_OUT_REG 0x52
+#define RK805_OUT1_VAL_MSK BIT(0)
+#define RK805_OUT2_VAL_MSK BIT(1)
+
+#define OUTPUT_MODE BIT(0)
+#define INPUT_MODE BIT(1)
+
+/*
+ * @mode: supported modes for this gpio, i.e. OUTPUT_MODE, OUTPUT_MODE...
+ * @reg: gpio status setting register
+ * @func_mask: functions select mask value
+ * @dir_mask: input or output mask value
+ * @val_mask: gpio set value
+ */
+struct gpio_pin {
+ u8 mode;
+ u8 reg;
+ u8 func_mask;
+ u8 dir_msk;
+ u8 val_msk;
+};
+
+struct rk805_gpio {
+ struct device *dev;
+ struct gpio_chip chip;
+ struct gpio_pin *pins;
+ struct rk808 *rk808;
+};
+
+static int rk805_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret;
+ struct rk805_gpio *gpio = gpiochip_get_data(chip);
+
+ if (!(gpio->pins[offset].mode & INPUT_MODE)) {
+ dev_err(gpio->dev, "gpio%d not support input mode\n", offset);
+ return -EINVAL;
+ }
+
+ if (gpio->pins[offset].dir_msk) {
+ ret = regmap_update_bits(gpio->rk808->regmap,
+ gpio->pins[offset].reg,
+ gpio->pins[offset].dir_msk, 0);
+ if (ret) {
+ dev_err(gpio->dev, "set gpio%d input failed\n", offset);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int rk805_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ struct rk805_gpio *gpio = gpiochip_get_data(chip);
+
+ if (!(gpio->pins[offset].mode & OUTPUT_MODE)) {
+ dev_err(gpio->dev, "gpio%d not support output mode\n", offset);
+ return -EINVAL;
+ }
+
+ if (gpio->pins[offset].dir_msk) {
+ ret = regmap_update_bits(gpio->rk808->regmap,
+ gpio->pins[offset].reg,
+ gpio->pins[offset].dir_msk,
+ gpio->pins[offset].dir_msk);
+ if (ret) {
+ dev_err(gpio->dev, "set gpio%d out failed\n", offset);
+ return ret;
+ }
+ }
+
+ ret = regmap_update_bits(gpio->rk808->regmap,
+ gpio->pins[offset].reg,
+ gpio->pins[offset].val_msk,
+ value ? gpio->pins[offset].val_msk : 0);
+ if (ret) {
+ dev_err(gpio->dev, "set gpio%d value failed\n", offset);
+ return ret;
+ }
+
+ return ret;
+}
+
+static int rk805_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ int ret, val;
+ struct rk805_gpio *gpio = gpiochip_get_data(chip);
+
+ ret = regmap_read(gpio->rk808->regmap, gpio->pins[offset].reg, &val);
+ if (ret) {
+ dev_err(gpio->dev, "gpio%d not support output mode\n", offset);
+ return ret;
+ }
+
+ return (val & gpio->pins[offset].val_msk) ? 1 : 0;
+}
+
+static void rk805_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct rk805_gpio *gpio = gpiochip_get_data(chip);
+
+ if (!(gpio->pins[offset].mode & OUTPUT_MODE)) {
+ dev_err(gpio->dev, "gpio%d not support output mode\n", offset);
+ return;
+ }
+
+ regmap_update_bits(gpio->rk808->regmap,
+ gpio->pins[offset].reg,
+ gpio->pins[offset].val_msk,
+ value ? gpio->pins[offset].val_msk : 0);
+}
+
+static int rk805_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ int ret;
+ struct rk805_gpio *gpio = gpiochip_get_data(chip);
+
+ /* switch to gpio mode */
+ if (gpio->pins[offset].func_mask) {
+ ret = regmap_update_bits(gpio->rk808->regmap,
+ gpio->pins[offset].reg,
+ gpio->pins[offset].func_mask,
+ gpio->pins[offset].func_mask);
+ if (ret) {
+ dev_err(gpio->dev, "set gpio%d func failed\n", offset);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct gpio_chip rk805_chip = {
+ .label = "rk805-gpio",
+ .owner = THIS_MODULE,
+ .direction_input = rk805_gpio_direction_input,
+ .direction_output = rk805_gpio_direction_output,
+ .get = rk805_gpio_get,
+ .set = rk805_gpio_set,
+ .request = rk805_gpio_request,
+ .base = -1,
+ .ngpio = 2,
+ .can_sleep = true,
+};
+
+static struct gpio_pin rk805_gpio_pins[] = {
+ {
+ .mode = OUTPUT_MODE,
+ .reg = RK805_OUT_REG,
+ .val_msk = RK805_OUT1_VAL_MSK,
+ },
+ {
+ .mode = OUTPUT_MODE,
+ .reg = RK805_OUT_REG,
+ .val_msk = RK805_OUT2_VAL_MSK,
+ },
+};
+
+static int rk805_gpio_probe(struct platform_device *pdev)
+{
+ struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
+ struct i2c_client *client = rk808->i2c;
+ struct rk805_gpio *gpio;
+ int ret;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ switch (rk808->variant) {
+ case RK805_ID:
+ gpio->chip = rk805_chip;
+ gpio->pins = rk805_gpio_pins;
+ break;
+ default:
+ dev_err(&pdev->dev, "unsupported RK8XX ID %lu\n",
+ rk808->variant);
+ return -EINVAL;
+ }
+
+ gpio->chip.parent = &client->dev;
+ gpio->rk808 = rk808;
+ gpio->dev = &pdev->dev;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, gpio);
+
+ return 0;
+}
+
+static struct platform_driver rk805_gpio_driver = {
+ .probe = rk805_gpio_probe,
+ .driver = {
+ .name = "rk805-gpio",
+ },
+};
+module_platform_driver(rk805_gpio_driver);
+
+MODULE_AUTHOR("Chen Jianghong <chenjh@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip RK805 PMIC GPIO driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1