From: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
Provide a GPIO chip to control the two output lines available on the
MAX9286.
Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
---
drivers/media/i2c/max9286.c | 66 +++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 4761e0b92ba2..df77871e603c 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/fwnode.h>
#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/module.h>
@@ -59,6 +60,8 @@
#define MAX9286_HVSRC_D0 (2 << 0)
#define MAX9286_HVSRC_D14 (1 << 0)
#define MAX9286_HVSRC_D18 (0 << 0)
+/* Register 0x0f */
+#define MAX9286_0X0F_RESERVED BIT(3)
/* Register 0x12 */
#define MAX9286_CSILANECNT(n) (((n) - 1) << 6)
#define MAX9286_CSIDBL BIT(5)
@@ -147,6 +150,9 @@ struct max9286_priv {
struct regulator *regulator;
bool poc_enabled;
+ struct gpio_chip gpio;
+ u8 gpio_state;
+
struct i2c_mux_core *mux;
unsigned int mux_channel;
bool mux_open;
@@ -714,6 +720,58 @@ static const struct of_device_id max9286_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, max9286_dt_ids);
+static void max9286_gpio_set(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct max9286_priv *priv = gpiochip_get_data(chip);
+
+ if (value)
+ priv->gpio_state |= BIT(offset);
+ else
+ priv->gpio_state &= ~BIT(offset);
+
+ max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state);
+}
+
+static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct max9286_priv *priv = gpiochip_get_data(chip);
+
+ return priv->gpio_state & BIT(offset);
+}
+
+static int max9286_gpio(struct max9286_priv *priv)
+{
+ struct device *dev = &priv->client->dev;
+ struct gpio_chip *gpio = &priv->gpio;
+ int ret;
+
+ static const char * const names[] = {
+ "GPIO0OUT",
+ "GPIO1OUT",
+ };
+
+ /* Configure the GPIO */
+ gpio->label = dev_name(dev);
+ gpio->parent = dev;
+ gpio->owner = THIS_MODULE;
+ gpio->of_node = dev->of_node;
+ gpio->ngpio = 2;
+ gpio->set = max9286_gpio_set;
+ gpio->get = max9286_gpio_get;
+ gpio->can_sleep = true;
+ gpio->names = names;
+
+ /* GPIO values default to high */
+ priv->gpio_state = BIT(0) | BIT(1);
+
+ ret = devm_gpiochip_add_data(dev, gpio, priv);
+ if (ret)
+ dev_err(dev, "Unable to create gpio_chip\n");
+
+ return ret;
+}
+
static int max9286_init(struct device *dev)
{
struct max9286_priv *priv;
@@ -994,6 +1052,14 @@ static int max9286_probe(struct i2c_client *client)
gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn");
gpiod_set_value_cansleep(priv->gpiod_pwdn, 1);
+ /*
+ * It is possible to set up the power regulator from the GPIO lines,
+ * so it needs to be set up early.
+ */
+ ret = max9286_gpio(priv);
+ if (ret)
+ return ret;
+
priv->regulator = regulator_get(&client->dev, "poc");
if (IS_ERR(priv->regulator)) {
if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
--
2.20.1
