media: i2c: ov5647: Add support for regulator control.

The driver supported using GPIOs to control the shutdown line,
but no regulator control.

Add regulator hooks.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
index b92c0747763925bc77a0c23aa03aadd6234ce2c8..3b7a15852c5d2ce4730d903a0e1ae596e811ef79 100644 (file)
--- a/drivers/media/i2c/ov5647.c
+++ b/drivers/media/i2c/ov5647.c
@@ -27,6 +27,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-ctrls.h>
@@ -92,6 +93,15 @@
 #define OV5647_EXPOSURE_DEFAULT                1000
 #define OV5647_EXPOSURE_MAX            65535
 
+/* regulator supplies */
+static const char * const ov5647_supply_names[] = {
+       "avdd",         /* Analog power */
+       "dovdd",        /* Digital I/O power */
+       "dvdd",         /* Digital core power */
+};
+
+#define OV5647_NUM_SUPPLIES ARRAY_SIZE(ov5647_supply_names)
+
 struct regval_list {
        u16 addr;
        u8 data;
@@ -120,6 +130,7 @@ struct ov5647 {
        int                             power_count;
        struct clk                      *xclk;
        struct gpio_desc                *pwdn;
+       struct regulator_bulk_data supplies[OV5647_NUM_SUPPLIES];
        unsigned int                    flags;
        struct v4l2_ctrl_handler        ctrls;
        struct v4l2_ctrl                *pixel_rate;
@@ -949,6 +960,13 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on)
        if (on && !ov5647->power_count) {
                dev_dbg(&client->dev, "OV5647 power on\n");
 
+               ret = regulator_bulk_enable(OV5647_NUM_SUPPLIES,
+                                           ov5647->supplies);
+               if (ret < 0) {
+                       dev_err(&client->dev, "Failed to enable regulators\n");
+                       goto out;
+               }
+
                if (ov5647->pwdn) {
                        gpiod_set_value_cansleep(ov5647->pwdn, 0);
                        msleep(PWDN_ACTIVE_DELAY_MS);
@@ -956,6 +974,8 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on)
 
                ret = clk_prepare_enable(ov5647->xclk);
                if (ret < 0) {
+                       regulator_bulk_disable(OV5647_NUM_SUPPLIES,
+                                              ov5647->supplies);
                        dev_err(&client->dev, "clk prepare enable failed\n");
                        goto out;
                }
@@ -964,6 +984,8 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on)
                                         ARRAY_SIZE(sensor_oe_enable_regs));
                if (ret < 0) {
                        clk_disable_unprepare(ov5647->xclk);
+                       regulator_bulk_disable(OV5647_NUM_SUPPLIES,
+                                              ov5647->supplies);
                        dev_err(&client->dev,
                                "write sensor_oe_enable_regs error\n");
                        goto out;
@@ -975,6 +997,8 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on)
                ret = ov5647_stream_off(sd);
                if (ret < 0) {
                        clk_disable_unprepare(ov5647->xclk);
+                       regulator_bulk_disable(OV5647_NUM_SUPPLIES,
+                                              ov5647->supplies);
                        dev_err(&client->dev,
                                "Camera not available, check Power\n");
                        goto out;
@@ -999,6 +1023,8 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on)
                clk_disable_unprepare(ov5647->xclk);
 
                gpiod_set_value_cansleep(ov5647->pwdn, 1);
+
+               regulator_bulk_disable(OV5647_NUM_SUPPLIES, ov5647->supplies);
        }
 
        /* Update the power count. */
@@ -1557,6 +1583,18 @@ static const struct v4l2_ctrl_ops ov5647_ctrl_ops = {
        .s_ctrl = ov5647_s_ctrl,
 };
 
+static int ov5647_configure_regulators(struct device *dev,
+                                      struct ov5647 *ov5647)
+{
+       unsigned int i;
+
+       for (i = 0; i < OV5647_NUM_SUPPLIES; i++)
+               ov5647->supplies[i].supply = ov5647_supply_names[i];
+
+       return devm_regulator_bulk_get(dev, OV5647_NUM_SUPPLIES,
+                                      ov5647->supplies);
+}
+
 static int ov5647_probe(struct i2c_client *client)
 {
        struct device *dev = &client->dev;
@@ -1597,6 +1635,12 @@ static int ov5647_probe(struct i2c_client *client)
        sensor->pwdn = devm_gpiod_get_optional(&client->dev, "pwdn",
                                               GPIOD_OUT_HIGH);
 
+       ret = ov5647_configure_regulators(dev, sensor);
+       if (ret) {
+               dev_err(dev, "Failed to get power regulators\n");
+               return ret;
+       }
+
        mutex_init(&sensor->lock);
 
        /* Initialise controls. */
@@ -1701,6 +1745,12 @@ static int ov5647_probe(struct i2c_client *client)
        if (ret < 0)
                goto mutex_remove;
 
+       ret = regulator_bulk_enable(OV5647_NUM_SUPPLIES, sensor->supplies);
+       if (ret < 0) {
+               dev_err(dev, "Failed to enable regulators\n");
+               goto error;
+       }
+
        if (sensor->pwdn) {
                gpiod_set_value_cansleep(sensor->pwdn, 0);
                msleep(PWDN_ACTIVE_DELAY_MS);
@@ -1711,7 +1761,7 @@ static int ov5647_probe(struct i2c_client *client)
        gpiod_set_value_cansleep(sensor->pwdn, 1);
 
        if (ret < 0)
-               goto error;
+               goto power_down;
 
        ret = v4l2_async_register_subdev(sd);
        if (ret < 0)
@@ -1719,6 +1769,8 @@ static int ov5647_probe(struct i2c_client *client)
 
        dev_dbg(dev, "OmniVision OV5647 camera driver probed\n");
        return 0;
+power_down:
+       regulator_bulk_disable(OV5647_NUM_SUPPLIES, sensor->supplies);
 error:
        media_entity_cleanup(&sd->entity);
 mutex_remove: