media: ov5675: add device-tree support and support runtime PM
Until now, this driver only supported ACPI. This adds support for Device Tree too while enabling clock and regulators in runtime PM. Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
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@ -3,10 +3,14 @@
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#include <asm/unaligned.h>
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#include <linux/acpi.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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@ -17,7 +21,7 @@
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#define OV5675_LINK_FREQ_450MHZ 450000000ULL
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#define OV5675_SCLK 90000000LL
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#define OV5675_MCLK 19200000
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#define OV5675_XVCLK_19_2 19200000
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#define OV5675_DATA_LANES 2
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#define OV5675_RGB_DEPTH 10
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@ -76,6 +80,14 @@
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#define to_ov5675(_sd) container_of(_sd, struct ov5675, sd)
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static const char * const ov5675_supply_names[] = {
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"avdd", /* Analog power */
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"dovdd", /* Digital I/O power */
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"dvdd", /* Digital core power */
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};
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#define OV5675_NUM_SUPPLIES ARRAY_SIZE(ov5675_supply_names)
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enum {
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OV5675_LINK_FREQ_900MBPS,
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};
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@ -484,6 +496,9 @@ struct ov5675 {
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struct v4l2_subdev sd;
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struct media_pad pad;
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struct v4l2_ctrl_handler ctrl_handler;
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struct clk *xvclk;
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struct gpio_desc *reset_gpio;
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struct regulator_bulk_data supplies[OV5675_NUM_SUPPLIES];
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/* V4L2 Controls */
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struct v4l2_ctrl *link_freq;
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@ -946,6 +961,56 @@ static int ov5675_set_stream(struct v4l2_subdev *sd, int enable)
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return ret;
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}
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static int ov5675_power_off(struct device *dev)
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{
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/* 512 xvclk cycles after the last SCCB transation or MIPI frame end */
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u32 delay_us = DIV_ROUND_UP(512, OV5675_XVCLK_19_2 / 1000 / 1000);
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct ov5675 *ov5675 = to_ov5675(sd);
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usleep_range(delay_us, delay_us * 2);
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clk_disable_unprepare(ov5675->xvclk);
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gpiod_set_value_cansleep(ov5675->reset_gpio, 1);
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regulator_bulk_disable(OV5675_NUM_SUPPLIES, ov5675->supplies);
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return 0;
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}
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static int ov5675_power_on(struct device *dev)
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{
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u32 delay_us = DIV_ROUND_UP(8192, OV5675_XVCLK_19_2 / 1000 / 1000);
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct ov5675 *ov5675 = to_ov5675(sd);
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int ret;
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ret = clk_prepare_enable(ov5675->xvclk);
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if (ret < 0) {
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dev_err(dev, "failed to enable xvclk: %d\n", ret);
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return ret;
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}
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gpiod_set_value_cansleep(ov5675->reset_gpio, 1);
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ret = regulator_bulk_enable(OV5675_NUM_SUPPLIES, ov5675->supplies);
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if (ret) {
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clk_disable_unprepare(ov5675->xvclk);
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return ret;
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}
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/* Reset pulse should be at least 2ms and reset gpio released only once
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* regulators are stable.
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*/
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usleep_range(2000, 2200);
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gpiod_set_value_cansleep(ov5675->reset_gpio, 0);
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/* 8192 xvclk cycles prior to the first SCCB transation */
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usleep_range(delay_us, delay_us * 2);
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return 0;
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}
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static int __maybe_unused ov5675_suspend(struct device *dev)
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{
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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@ -1108,31 +1173,59 @@ static const struct v4l2_subdev_internal_ops ov5675_internal_ops = {
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.open = ov5675_open,
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};
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static int ov5675_check_hwcfg(struct device *dev)
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static int ov5675_get_hwcfg(struct ov5675 *ov5675, struct device *dev)
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{
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struct fwnode_handle *ep;
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struct fwnode_handle *fwnode = dev_fwnode(dev);
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struct v4l2_fwnode_endpoint bus_cfg = {
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.bus_type = V4L2_MBUS_CSI2_DPHY
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};
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u32 mclk;
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u32 xvclk_rate;
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int ret;
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unsigned int i, j;
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if (!fwnode)
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return -ENXIO;
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ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
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ov5675->xvclk = devm_clk_get_optional(dev, NULL);
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if (IS_ERR(ov5675->xvclk))
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return dev_err_probe(dev, PTR_ERR(ov5675->xvclk),
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"failed to get xvclk: %ld\n",
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PTR_ERR(ov5675->xvclk));
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if (ret) {
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dev_err(dev, "can't get clock frequency");
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if (ov5675->xvclk) {
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xvclk_rate = clk_get_rate(ov5675->xvclk);
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} else {
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ret = fwnode_property_read_u32(fwnode, "clock-frequency",
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&xvclk_rate);
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if (ret) {
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dev_err(dev, "can't get clock frequency");
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return ret;
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}
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}
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if (xvclk_rate != OV5675_XVCLK_19_2) {
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dev_err(dev, "external clock rate %u is unsupported",
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xvclk_rate);
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return -EINVAL;
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}
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ov5675->reset_gpio = devm_gpiod_get_optional(dev, "reset",
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GPIOD_OUT_HIGH);
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if (IS_ERR(ov5675->reset_gpio)) {
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ret = PTR_ERR(ov5675->reset_gpio);
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dev_err(dev, "failed to get reset-gpios: %d\n", ret);
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return ret;
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}
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if (mclk != OV5675_MCLK) {
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dev_err(dev, "external clock %d is not supported", mclk);
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return -EINVAL;
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}
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for (i = 0; i < OV5675_NUM_SUPPLIES; i++)
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ov5675->supplies[i].supply = ov5675_supply_names[i];
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ret = devm_regulator_bulk_get(dev, OV5675_NUM_SUPPLIES,
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ov5675->supplies);
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if (ret)
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return ret;
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ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
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if (!ep)
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@ -1187,6 +1280,10 @@ static void ov5675_remove(struct i2c_client *client)
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v4l2_ctrl_handler_free(sd->ctrl_handler);
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pm_runtime_disable(&client->dev);
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mutex_destroy(&ov5675->mutex);
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if (!pm_runtime_status_suspended(&client->dev))
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ov5675_power_off(&client->dev);
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pm_runtime_set_suspended(&client->dev);
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}
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static int ov5675_probe(struct i2c_client *client)
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@ -1195,25 +1292,31 @@ static int ov5675_probe(struct i2c_client *client)
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bool full_power;
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int ret;
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ret = ov5675_check_hwcfg(&client->dev);
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if (ret) {
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dev_err(&client->dev, "failed to check HW configuration: %d",
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ret);
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return ret;
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}
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ov5675 = devm_kzalloc(&client->dev, sizeof(*ov5675), GFP_KERNEL);
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if (!ov5675)
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return -ENOMEM;
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ret = ov5675_get_hwcfg(ov5675, &client->dev);
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if (ret) {
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dev_err(&client->dev, "failed to get HW configuration: %d",
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ret);
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return ret;
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}
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v4l2_i2c_subdev_init(&ov5675->sd, client, &ov5675_subdev_ops);
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ret = ov5675_power_on(&client->dev);
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if (ret) {
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dev_err(&client->dev, "failed to power on: %d\n", ret);
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return ret;
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}
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full_power = acpi_dev_state_d0(&client->dev);
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if (full_power) {
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ret = ov5675_identify_module(ov5675);
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if (ret) {
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dev_err(&client->dev, "failed to find sensor: %d", ret);
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return ret;
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goto probe_power_off;
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}
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}
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@ -1243,11 +1346,6 @@ static int ov5675_probe(struct i2c_client *client)
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goto probe_error_media_entity_cleanup;
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}
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/*
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* Device is already turned on by i2c-core with ACPI domain PM.
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* Enable runtime PM and turn off the device.
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*/
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/* Set the device's state to active if it's in D0 state. */
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if (full_power)
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pm_runtime_set_active(&client->dev);
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@ -1262,12 +1360,15 @@ probe_error_media_entity_cleanup:
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probe_error_v4l2_ctrl_handler_free:
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v4l2_ctrl_handler_free(ov5675->sd.ctrl_handler);
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mutex_destroy(&ov5675->mutex);
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probe_power_off:
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ov5675_power_off(&client->dev);
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return ret;
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}
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static const struct dev_pm_ops ov5675_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(ov5675_suspend, ov5675_resume)
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SET_RUNTIME_PM_OPS(ov5675_power_off, ov5675_power_on, NULL)
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};
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#ifdef CONFIG_ACPI
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@ -1279,11 +1380,18 @@ static const struct acpi_device_id ov5675_acpi_ids[] = {
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MODULE_DEVICE_TABLE(acpi, ov5675_acpi_ids);
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#endif
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static const struct of_device_id ov5675_of_match[] = {
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{ .compatible = "ovti,ov5675", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, ov5675_of_match);
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static struct i2c_driver ov5675_i2c_driver = {
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.driver = {
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.name = "ov5675",
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.pm = &ov5675_pm_ops,
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.acpi_match_table = ACPI_PTR(ov5675_acpi_ids),
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.of_match_table = ov5675_of_match,
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},
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.probe_new = ov5675_probe,
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.remove = ov5675_remove,
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