The DA9062 PMIC is a mfd device which have 5 gpios. These can be
configured to work as input/output or to have an alternate function.
This commit adds the support to configure the gpios as input or output.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
drivers/gpio/Kconfig | 4 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-da9062.c | 206 +++++++++++++++++++++++++++++++++++++
3 files changed, 211 insertions(+)
create mode 100644 drivers/gpio/gpio-da9062.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 7a1503198b..806b96ae26 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -13,6 +13,10 @@ config GPIO_DIGIC
bool "GPIO support for Canon DIGIC"
depends on ARCH_DIGIC
+config GPIO_DA9062
+ bool "GPIO support for DA9062 MFD"
+ depends on MFD_DA9063
+
config GPIO_74164
bool "Generic SPI attached shift register"
depends on SPI
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 990df01788..6f2bf11af8 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_GPIO_74164) += gpio-74164.o
obj-$(CONFIG_MACH_MIPS_ATH79) += gpio-ath79.o
obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
+obj-$(CONFIG_GPIO_DA9062) += gpio-da9062.o
obj-$(CONFIG_GPIO_DIGIC) += gpio-digic.o
obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
obj-$(CONFIG_GPIO_IMX) += gpio-imx.o
diff --git a/drivers/gpio/gpio-da9062.c b/drivers/gpio/gpio-da9062.c
new file mode 100644
index 0000000000..2f018166cc
--- /dev/null
+++ b/drivers/gpio/gpio-da9062.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@xxxxxxxxxxxxxx>
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <gpio.h>
+#include <i2c/i2c.h>
+#include <linux/bitops.h>
+#include <malloc.h>
+
+struct da9062_gpio {
+ struct gpio_chip gpio;
+ struct i2c_client *client;
+ struct device_d *dev;
+};
+
+#define DA9062AA_STATUS_B 0x002
+#define DA9062AA_GPIO_0_1 0x015
+#define DA9062AA_GPIO_MODE0_4 0x01D
+
+/* DA9062AA_GPIO_0_1 (addr=0x015) */
+#define DA9062AA_GPIO0_PIN_MASK 0x03
+
+#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 */
+
+static inline struct da9062_gpio *to_da9062(struct gpio_chip *chip)
+{
+ return container_of(chip, struct da9062_gpio, gpio);
+}
+
+static int gpio_da9062_reg_update(struct da9062_gpio *priv, unsigned int reg,
+ uint8_t mask, uint8_t val)
+{
+ struct i2c_client *client;
+ uint8_t tmp;
+ int ret;
+
+ if (reg < 0x100)
+ client = priv->client;
+
+ if (WARN_ON(!client))
+ return -EINVAL;
+
+ ret = i2c_read_reg(client, reg & 0xffu, &tmp, 1);
+ if (ret < 0) {
+ dev_warn(priv->dev, "failed to read reg %02x\n", reg);
+ return ret;
+ }
+
+ tmp &= ~mask;
+ tmp |= val;
+
+ ret = i2c_write_reg(client, reg & 0xffu, &tmp, 1);
+ if (ret < 0) {
+ dev_warn(priv->dev, "failed to write %02x into reg %02x\n",
+ tmp, reg);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gpio_da9062_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct da9062_gpio *priv = to_da9062(chip);
+ u8 mask, mode;
+
+ mode = DA9062_PIN_GPI << DA9062_PIN_SHIFT(offset);
+ mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset);
+
+ return gpio_da9062_reg_update(priv, DA9062AA_GPIO_0_1 + (offset >> 1),
+ mask, mode);
+}
+
+static int gpio_da9062_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct da9062_gpio *priv = to_da9062(chip);
+
+ return gpio_da9062_reg_update(priv, DA9062AA_GPIO_MODE0_4, BIT(offset),
+ value << offset);
+}
+
+static int gpio_da9062_get_pin_mode(struct da9062_gpio *priv, unsigned offset)
+{
+ int ret;
+ u8 val;
+
+ ret = i2c_read_reg(priv->client, DA9062AA_GPIO_0_1 + (offset >> 1),
+ &val, 1);
+ if (ret < 0)
+ return ret;
+
+ val >>= DA9062_PIN_SHIFT(offset);
+ val &= DA9062AA_GPIO0_PIN_MASK;
+
+ return val;
+}
+
+static int gpio_da9062_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct da9062_gpio *priv = to_da9062(chip);
+ int gpio_dir;
+ int ret;
+ u8 val;
+
+ gpio_dir = gpio_da9062_get_pin_mode(priv, offset);
+ if (gpio_dir < 0)
+ return gpio_dir;
+
+ switch (gpio_dir) {
+ case DA9062_PIN_ALTERNATE:
+ return -ENOTSUPP;
+ case DA9062_PIN_GPI:
+ ret = i2c_read_reg(priv->client, DA9062AA_STATUS_B, &val, 1);
+ if (ret < 0)
+ return ret;
+ break;
+ case DA9062_PIN_GPO_OD:
+ /* falltrough */
+ case DA9062_PIN_GPO_PP:
+ ret = i2c_read_reg(priv->client, DA9062AA_GPIO_MODE0_4, &val, 1);
+ if (ret < 0)
+ return ret;
+ }
+
+ return val & BIT(offset);
+}
+
+static int gpio_da9062_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+ struct da9062_gpio *priv = to_da9062(chip);
+ int gpio_dir;
+
+ gpio_dir = gpio_da9062_get_pin_mode(priv, offset);
+ if (gpio_dir < 0)
+ return gpio_dir;
+
+ switch (gpio_dir) {
+ case DA9062_PIN_ALTERNATE:
+ return -ENOTSUPP;
+ case DA9062_PIN_GPI:
+ return 1;
+ case DA9062_PIN_GPO_OD:
+ /* falltrough */
+ case DA9062_PIN_GPO_PP:
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static void gpio_da9062_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct da9062_gpio *priv = to_da9062(chip);
+
+ gpio_da9062_reg_update(priv, DA9062AA_GPIO_MODE0_4, BIT(offset),
+ value << offset);
+}
+
+static struct gpio_ops gpio_da9062_ops = {
+ .direction_input = gpio_da9062_direction_input,
+ .direction_output = gpio_da9062_direction_output,
+ .get_direction = gpio_da9062_get_direction,
+ .get = gpio_da9062_get,
+ .set = gpio_da9062_set,
+};
+
+static int gpio_da9062_probe(struct device_d *dev)
+{
+ struct da9062_gpio *priv;
+
+ if (!dev->parent)
+ return -EPROBE_DEFER;
+
+ priv = xzalloc(sizeof(*priv));
+ if (!priv)
+ return -ENOMEM;
+
+ priv->client = to_i2c_client(dev->parent);
+ priv->dev = dev;
+ priv->gpio.base = -1;
+ priv->gpio.ngpio = 5;
+ priv->gpio.ops = &gpio_da9062_ops;
+ priv->gpio.dev = dev;
+
+ return gpiochip_add(&priv->gpio);
+}
+
+static struct of_device_id const gpio_da9062_dt_ids[] = {
+ { .compatible = "dlg,da9062-gpio", },
+ { }
+};
+
+static struct driver_d gpio_da9062_driver = {
+ .name = "da9062-gpio",
+ .probe = gpio_da9062_probe,
+ .of_compatible = DRV_OF_COMPAT(gpio_da9062_dt_ids),
+};
+device_platform_driver(gpio_da9062_driver);
--
2.20.1
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