media: i2c: Add pm_runtime support to ov7251

Add pm_runtime support to the ov7251 driver.

Signed-off-by: Daniel Scally <djrscally@gmail.com>

diff --git a/drivers/media/i2c/ov7251.c b/drivers/media/i2c/ov7251.c
index 492b708..4d04722 100644 (file)
--- a/drivers/media/i2c/ov7251.c
+++ b/drivers/media/i2c/ov7251.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -884,6 +885,24 @@ static void ov7251_set_power_off(struct ov7251 *ov7251)
        ov7251_regulators_disable(ov7251);
 }
 
+static int __maybe_unused ov7251_sensor_suspend(struct device *dev)
+{
+       struct v4l2_subdev *sd = dev_get_drvdata(dev);
+       struct ov7251 *ov7251 = to_ov7251(sd);
+
+       ov7251_set_power_off(ov7251);
+
+       return 0;
+}
+
+static int __maybe_unused ov7251_sensor_resume(struct device *dev)
+{
+       struct v4l2_subdev *sd = dev_get_drvdata(dev);
+       struct ov7251 *ov7251 = to_ov7251(sd);
+
+       return ov7251_set_power_on(ov7251);
+}
+
 static int ov7251_s_power(struct v4l2_subdev *sd, int on)
 {
        struct ov7251 *ov7251 = to_ov7251(sd);
@@ -985,7 +1004,7 @@ static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
 
        /* v4l2_ctrl_lock() locks our mutex */
 
-       if (!ov7251->power_on)
+       if (!pm_runtime_get_if_in_use(ov7251->dev))
                return 0;
 
        switch (ctrl->id) {
@@ -1009,6 +1028,8 @@ static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
                break;
        }
 
+       pm_runtime_put(ov7251->dev);
+
        return ret;
 }
 
@@ -1261,10 +1282,15 @@ static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
        mutex_lock(&ov7251->lock);
 
        if (enable) {
+               ret = pm_runtime_get_sync(ov7251->dev);
+               if (ret < 0)
+                       return ret;
+
                ret = ov7251_pll_configure(ov7251);
-               if (ret)
-                       return dev_err_probe(ov7251->dev, ret,
-                                            "error configuring PLLs\n");
+               if (ret) {
+                       dev_err(ov7251->dev, "error configuring PLLs\n");
+                       goto err_power_down;
+               }
 
                ret = ov7251_set_register_array(ov7251,
                                        ov7251->current_mode->data,
@@ -1273,23 +1299,29 @@ static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
                        dev_err(ov7251->dev, "could not set mode %dx%d\n",
                                ov7251->current_mode->width,
                                ov7251->current_mode->height);
-                       goto exit;
+                       goto err_power_down;
                }
                ret = __v4l2_ctrl_handler_setup(&ov7251->ctrls);
                if (ret < 0) {
                        dev_err(ov7251->dev, "could not sync v4l2 controls\n");
-                       goto exit;
+                       goto err_power_down;
                }
                ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
                                       OV7251_SC_MODE_SELECT_STREAMING);
+               if (ret)
+                       goto err_power_down;
        } else {
                ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
                                       OV7251_SC_MODE_SELECT_SW_STANDBY);
+               pm_runtime_put(ov7251->dev);
        }
 
-exit:
        mutex_unlock(&ov7251->lock);
+       return ret;
 
+err_power_down:
+       pm_runtime_put_noidle(ov7251->dev);
+       mutex_unlock(&ov7251->lock);
        return ret;
 }
 
@@ -1615,23 +1647,24 @@ static int ov7251_probe(struct i2c_client *client)
                goto free_ctrl;
        }
 
-       ret = ov7251_s_power(&ov7251->sd, true);
-       if (ret < 0) {
-               dev_err(dev, "could not power up OV7251\n");
+       ret = ov7251_set_power_on(ov7251);
+       if (ret)
                goto free_entity;
-       }
 
        ret = ov7251_detect_chip(ov7251);
        if (ret)
                goto power_down;
 
+       pm_runtime_set_active(&client->dev);
+       pm_runtime_get_noresume(&client->dev);
+       pm_runtime_enable(&client->dev);
 
        ret = ov7251_read_reg(ov7251, OV7251_PRE_ISP_00,
                              &ov7251->pre_isp_00);
        if (ret < 0) {
                dev_err(dev, "could not read test pattern value\n");
                ret = -ENODEV;
-               goto power_down;
+               goto err_pm_runtime;
        }
 
        ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT1,
@@ -1639,7 +1672,7 @@ static int ov7251_probe(struct i2c_client *client)
        if (ret < 0) {
                dev_err(dev, "could not read vflip value\n");
                ret = -ENODEV;
-               goto power_down;
+               goto err_pm_runtime;
        }
 
        ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT2,
@@ -1647,10 +1680,12 @@ static int ov7251_probe(struct i2c_client *client)
        if (ret < 0) {
                dev_err(dev, "could not read hflip value\n");
                ret = -ENODEV;
-               goto power_down;
+               goto err_pm_runtime;
        }
 
-       ov7251_s_power(&ov7251->sd, false);
+       pm_runtime_set_autosuspend_delay(&client->dev, 1000);
+       pm_runtime_use_autosuspend(&client->dev);
+       pm_runtime_put_autosuspend(&client->dev);
 
        ret = v4l2_async_register_subdev(&ov7251->sd);
        if (ret < 0) {
@@ -1662,6 +1697,9 @@ static int ov7251_probe(struct i2c_client *client)
 
        return 0;
 
+err_pm_runtime:
+       pm_runtime_disable(ov7251->dev);
+       pm_runtime_put_noidle(ov7251->dev);
 power_down:
        ov7251_s_power(&ov7251->sd, false);
 free_entity:
@@ -1683,9 +1721,18 @@ static int ov7251_remove(struct i2c_client *client)
        v4l2_ctrl_handler_free(&ov7251->ctrls);
        mutex_destroy(&ov7251->lock);
 
+       pm_runtime_disable(ov7251->dev);
+       if (!pm_runtime_status_suspended(ov7251->dev))
+               ov7251_set_power_off(ov7251);
+       pm_runtime_set_suspended(ov7251->dev);
+
        return 0;
 }
 
+static const struct dev_pm_ops ov7251_pm_ops = {
+       SET_RUNTIME_PM_OPS(ov7251_sensor_suspend, ov7251_sensor_resume, NULL)
+};
+
 static const struct of_device_id ov7251_of_match[] = {
        { .compatible = "ovti,ov7251" },
        { /* sentinel */ }
@@ -1703,6 +1750,7 @@ static struct i2c_driver ov7251_i2c_driver = {
                .of_match_table = ov7251_of_match,
                .acpi_match_table = ov7251_acpi_match,
                .name  = "ov7251",
+               .pm = &ov7251_pm_ops,
        },
        .probe_new  = ov7251_probe,
        .remove = ov7251_remove,