@@ -967,6 +967,19 @@ static int og01a1b_check_hwcfg(struct device *dev)
return ret;
}
+/* Power/clock management functions */
+static int og01a1b_power_on(struct device *dev)
+{
+ /* Device is already turned on by i2c-core with ACPI domain PM. */
+
+ return 0;
+}
+
+static int og01a1b_power_off(struct device *dev)
+{
+ return 0;
+}
+
static void og01a1b_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
@@ -984,6 +997,12 @@ static int og01a1b_probe(struct i2c_client *client)
struct og01a1b *og01a1b;
int ret;
+ og01a1b = devm_kzalloc(&client->dev, sizeof(*og01a1b), GFP_KERNEL);
+ if (!og01a1b)
+ return -ENOMEM;
+
+ v4l2_i2c_subdev_init(&og01a1b->sd, client, &og01a1b_subdev_ops);
+
ret = og01a1b_check_hwcfg(&client->dev);
if (ret) {
dev_err(&client->dev, "failed to check HW configuration: %d",
@@ -991,15 +1010,15 @@ static int og01a1b_probe(struct i2c_client *client)
return ret;
}
- og01a1b = devm_kzalloc(&client->dev, sizeof(*og01a1b), GFP_KERNEL);
- if (!og01a1b)
- return -ENOMEM;
+ /* The sensor must be powered on to read the CHIP_ID register */
+ ret = og01a1b_power_on(&client->dev);
+ if (ret)
+ return ret;
- v4l2_i2c_subdev_init(&og01a1b->sd, client, &og01a1b_subdev_ops);
ret = og01a1b_identify_module(og01a1b);
if (ret) {
dev_err(&client->dev, "failed to find sensor: %d", ret);
- return ret;
+ goto power_off;
}
mutex_init(&og01a1b->mutex);
@@ -1028,10 +1047,7 @@ static int og01a1b_probe(struct i2c_client *client)
goto probe_error_media_entity_cleanup;
}
- /*
- * Device is already turned on by i2c-core with ACPI domain PM.
- * Enable runtime PM and turn off the device.
- */
+ /* Enable runtime PM and turn off the device */
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
pm_runtime_idle(&client->dev);
@@ -1045,9 +1061,16 @@ static int og01a1b_probe(struct i2c_client *client)
v4l2_ctrl_handler_free(og01a1b->sd.ctrl_handler);
mutex_destroy(&og01a1b->mutex);
+power_off:
+ og01a1b_power_off(&client->dev);
+
return ret;
}
+static const struct dev_pm_ops og01a1b_pm_ops = {
+ SET_RUNTIME_PM_OPS(og01a1b_power_off, og01a1b_power_on, NULL)
+};
+
#ifdef CONFIG_ACPI
static const struct acpi_device_id og01a1b_acpi_ids[] = {
{"OVTI01AC"},
@@ -1066,6 +1089,7 @@ MODULE_DEVICE_TABLE(of, og01a1b_of_match);
static struct i2c_driver og01a1b_i2c_driver = {
.driver = {
.name = "og01a1b",
+ .pm = &og01a1b_pm_ops,
.acpi_match_table = ACPI_PTR(og01a1b_acpi_ids),
.of_match_table = og01a1b_of_match,
},
Rearrange initializations and checks in probe before population of the power management functions. Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> --- drivers/media/i2c/og01a1b.c | 42 +++++++++++++++++++++++++++++-------- 1 file changed, 33 insertions(+), 9 deletions(-)