1 files changed, 390 insertions, 0 deletions
diff --git a/drivers/media/i2c/s5k6a3.c b/drivers/media/i2c/s5k6a3.c
new file mode 100644
index 000000000..bc389d5e4
--- /dev/null
+++ b/drivers/media/i2c/s5k6a3.c
@@ -0,0 +1,390 @@
+/*
+ * Samsung S5K6A3 image sensor driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-subdev.h>
+
+#define S5K6A3_SENSOR_MAX_WIDTH		1412
+#define S5K6A3_SENSOR_MAX_HEIGHT	1412
+#define S5K6A3_SENSOR_MIN_WIDTH		32
+#define S5K6A3_SENSOR_MIN_HEIGHT	32
+
+#define S5K6A3_DEFAULT_WIDTH		1296
+#define S5K6A3_DEFAULT_HEIGHT		732
+
+#define S5K6A3_DRV_NAME			"S5K6A3"
+#define S5K6A3_CLK_NAME			"extclk"
+#define S5K6A3_DEFAULT_CLK_FREQ		24000000U
+
+enum {
+	S5K6A3_SUPP_VDDA,
+	S5K6A3_SUPP_VDDIO,
+	S5K6A3_SUPP_AFVDD,
+	S5K6A3_NUM_SUPPLIES,
+};
+
+/**
+ * struct s5k6a3 - fimc-is sensor data structure
+ * @dev: pointer to this I2C client device structure
+ * @subdev: the image sensor's v4l2 subdev
+ * @pad: subdev media source pad
+ * @supplies: image sensor's voltage regulator supplies
+ * @gpio_reset: GPIO connected to the sensor's reset pin
+ * @lock: mutex protecting the structure's members below
+ * @format: media bus format at the sensor's source pad
+ */
+struct s5k6a3 {
+	struct device *dev;
+	struct v4l2_subdev subdev;
+	struct media_pad pad;
+	struct regulator_bulk_data supplies[S5K6A3_NUM_SUPPLIES];
+	int gpio_reset;
+	struct mutex lock;
+	struct v4l2_mbus_framefmt format;
+	struct clk *clock;
+	u32 clock_frequency;
+	int power_count;
+};
+
+static const char * const s5k6a3_supply_names[] = {
+	[S5K6A3_SUPP_VDDA]	= "svdda",
+	[S5K6A3_SUPP_VDDIO]	= "svddio",
+	[S5K6A3_SUPP_AFVDD]	= "afvdd",
+};
+
+static inline struct s5k6a3 *sd_to_s5k6a3(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct s5k6a3, subdev);
+}
+
+static const struct v4l2_mbus_framefmt s5k6a3_formats[] = {
+	{
+		.code = MEDIA_BUS_FMT_SGRBG10_1X10,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.field = V4L2_FIELD_NONE,
+	}
+};
+
+static const struct v4l2_mbus_framefmt *find_sensor_format(
+	struct v4l2_mbus_framefmt *mf)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(s5k6a3_formats); i++)
+		if (mf->code == s5k6a3_formats[i].code)
+			return &s5k6a3_formats[i];
+
+	return &s5k6a3_formats[0];
+}
+
+static int s5k6a3_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(s5k6a3_formats))
+		return -EINVAL;
+
+	code->code = s5k6a3_formats[code->index].code;
+	return 0;
+}
+
+static void s5k6a3_try_format(struct v4l2_mbus_framefmt *mf)
+{
+	const struct v4l2_mbus_framefmt *fmt;
+
+	fmt = find_sensor_format(mf);
+	mf->code = fmt->code;
+	mf->field = V4L2_FIELD_NONE;
+	v4l_bound_align_image(&mf->width, S5K6A3_SENSOR_MIN_WIDTH,
+			      S5K6A3_SENSOR_MAX_WIDTH, 0,
+			      &mf->height, S5K6A3_SENSOR_MIN_HEIGHT,
+			      S5K6A3_SENSOR_MAX_HEIGHT, 0, 0);
+}
+
+static struct v4l2_mbus_framefmt *__s5k6a3_get_format(
+		struct s5k6a3 *sensor, struct v4l2_subdev_pad_config *cfg,
+		u32 pad, enum v4l2_subdev_format_whence which)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
+		return cfg ? v4l2_subdev_get_try_format(&sensor->subdev, cfg, pad) : NULL;
+
+	return &sensor->format;
+}
+
+static int s5k6a3_set_fmt(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_format *fmt)
+{
+	struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
+	struct v4l2_mbus_framefmt *mf;
+
+	s5k6a3_try_format(&fmt->format);
+
+	mf = __s5k6a3_get_format(sensor, cfg, fmt->pad, fmt->which);
+	if (mf) {
+		mutex_lock(&sensor->lock);
+		if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+			*mf = fmt->format;
+		mutex_unlock(&sensor->lock);
+	}
+	return 0;
+}
+
+static int s5k6a3_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
+	struct v4l2_mbus_framefmt *mf;
+
+	mf = __s5k6a3_get_format(sensor, cfg, fmt->pad, fmt->which);
+
+	mutex_lock(&sensor->lock);
+	fmt->format = *mf;
+	mutex_unlock(&sensor->lock);
+	return 0;
+}
+
+static struct v4l2_subdev_pad_ops s5k6a3_pad_ops = {
+	.enum_mbus_code	= s5k6a3_enum_mbus_code,
+	.get_fmt	= s5k6a3_get_fmt,
+	.set_fmt	= s5k6a3_set_fmt,
+};
+
+static int s5k6a3_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+	*format		= s5k6a3_formats[0];
+	format->width	= S5K6A3_DEFAULT_WIDTH;
+	format->height	= S5K6A3_DEFAULT_HEIGHT;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_internal_ops s5k6a3_sd_internal_ops = {
+	.open = s5k6a3_open,
+};
+
+static int __s5k6a3_power_on(struct s5k6a3 *sensor)
+{
+	int i = S5K6A3_SUPP_VDDA;
+	int ret;
+
+	ret = clk_set_rate(sensor->clock, sensor->clock_frequency);
+	if (ret < 0)
+		return ret;
+
+	ret = pm_runtime_get(sensor->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_enable(sensor->supplies[i].consumer);
+	if (ret < 0)
+		goto error_rpm_put;
+
+	ret = clk_prepare_enable(sensor->clock);
+	if (ret < 0)
+		goto error_reg_dis;
+
+	for (i++; i < S5K6A3_NUM_SUPPLIES; i++) {
+		ret = regulator_enable(sensor->supplies[i].consumer);
+		if (ret < 0)
+			goto error_reg_dis;
+	}
+
+	gpio_set_value(sensor->gpio_reset, 1);
+	usleep_range(600, 800);
+	gpio_set_value(sensor->gpio_reset, 0);
+	usleep_range(600, 800);
+	gpio_set_value(sensor->gpio_reset, 1);
+
+	/* Delay needed for the sensor initialization */
+	msleep(20);
+	return 0;
+
+error_reg_dis:
+	for (--i; i >= 0; --i)
+		regulator_disable(sensor->supplies[i].consumer);
+error_rpm_put:
+	pm_runtime_put(sensor->dev);
+	return ret;
+}
+
+static int __s5k6a3_power_off(struct s5k6a3 *sensor)
+{
+	int i;
+
+	gpio_set_value(sensor->gpio_reset, 0);
+
+	for (i = S5K6A3_NUM_SUPPLIES - 1; i >= 0; i--)
+		regulator_disable(sensor->supplies[i].consumer);
+
+	clk_disable_unprepare(sensor->clock);
+	pm_runtime_put(sensor->dev);
+	return 0;
+}
+
+static int s5k6a3_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
+	int ret = 0;
+
+	mutex_lock(&sensor->lock);
+
+	if (sensor->power_count == !on) {
+		if (on)
+			ret = __s5k6a3_power_on(sensor);
+		else
+			ret = __s5k6a3_power_off(sensor);
+
+		if (ret == 0)
+			sensor->power_count += on ? 1 : -1;
+	}
+
+	mutex_unlock(&sensor->lock);
+	return ret;
+}
+
+static struct v4l2_subdev_core_ops s5k6a3_core_ops = {
+	.s_power = s5k6a3_s_power,
+};
+
+static struct v4l2_subdev_ops s5k6a3_subdev_ops = {
+	.core = &s5k6a3_core_ops,
+	.pad = &s5k6a3_pad_ops,
+};
+
+static int s5k6a3_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct s5k6a3 *sensor;
+	struct v4l2_subdev *sd;
+	int gpio, i, ret;
+
+	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
+	if (!sensor)
+		return -ENOMEM;
+
+	mutex_init(&sensor->lock);
+	sensor->gpio_reset = -EINVAL;
+	sensor->clock = ERR_PTR(-EINVAL);
+	sensor->dev = dev;
+
+	sensor->clock = devm_clk_get(sensor->dev, S5K6A3_CLK_NAME);
+	if (IS_ERR(sensor->clock))
+		return PTR_ERR(sensor->clock);
+
+	gpio = of_get_gpio_flags(dev->of_node, 0, NULL);
+	if (!gpio_is_valid(gpio))
+		return gpio;
+
+	ret = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_LOW,
+						S5K6A3_DRV_NAME);
+	if (ret < 0)
+		return ret;
+
+	sensor->gpio_reset = gpio;
+
+	if (of_property_read_u32(dev->of_node, "clock-frequency",
+				 &sensor->clock_frequency)) {
+		sensor->clock_frequency = S5K6A3_DEFAULT_CLK_FREQ;
+		dev_info(dev, "using default %u Hz clock frequency\n",
+					sensor->clock_frequency);
+	}
+
+	for (i = 0; i < S5K6A3_NUM_SUPPLIES; i++)
+		sensor->supplies[i].supply = s5k6a3_supply_names[i];
+
+	ret = devm_regulator_bulk_get(&client->dev, S5K6A3_NUM_SUPPLIES,
+				      sensor->supplies);
+	if (ret < 0)
+		return ret;
+
+	sd = &sensor->subdev;
+	v4l2_i2c_subdev_init(sd, client, &s5k6a3_subdev_ops);
+	sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	sd->internal_ops = &s5k6a3_sd_internal_ops;
+
+	sensor->format.code = s5k6a3_formats[0].code;
+	sensor->format.width = S5K6A3_DEFAULT_WIDTH;
+	sensor->format.height = S5K6A3_DEFAULT_HEIGHT;
+
+	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_init(&sd->entity, 1, &sensor->pad, 0);
+	if (ret < 0)
+		return ret;
+
+	pm_runtime_no_callbacks(dev);
+	pm_runtime_enable(dev);
+
+	ret = v4l2_async_register_subdev(sd);
+
+	if (ret < 0) {
+		pm_runtime_disable(&client->dev);
+		media_entity_cleanup(&sd->entity);
+	}
+
+	return ret;
+}
+
+static int s5k6a3_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+	pm_runtime_disable(&client->dev);
+	v4l2_async_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	return 0;
+}
+
+static const struct i2c_device_id s5k6a3_ids[] = {
+	{ }
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id s5k6a3_of_match[] = {
+	{ .compatible = "samsung,s5k6a3" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, s5k6a3_of_match);
+#endif
+
+static struct i2c_driver s5k6a3_driver = {
+	.driver = {
+		.of_match_table	= of_match_ptr(s5k6a3_of_match),
+		.name		= S5K6A3_DRV_NAME,
+		.owner		= THIS_MODULE,
+	},
+	.probe		= s5k6a3_probe,
+	.remove		= s5k6a3_remove,
+	.id_table	= s5k6a3_ids,
+};
+
+module_i2c_driver(s5k6a3_driver);
+
+MODULE_DESCRIPTION("S5K6A3 image sensor subdev driver");
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_LICENSE("GPL v2");