diff options
Diffstat (limited to 'drivers/media/i2c/ov5647.c')
| -rw-r--r-- | drivers/media/i2c/ov5647.c | 634 |
1 files changed, 634 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c new file mode 100644 index 000000000000..f57a0b354cf6 --- /dev/null +++ b/drivers/media/i2c/ov5647.c @@ -0,0 +1,634 @@ +/* + * A V4L2 driver for OmniVision OV5647 cameras. + * + * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver + * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki@samsung.com> + * + * Based on Omnivision OV7670 Camera Driver + * Copyright (C) 2006-7 Jonathan Corbet <corbet@lwn.net> + * + * Copyright (C) 2016, Synopsys, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed .as is. WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/videodev2.h> +#include <media/v4l2-device.h> +#include <media/v4l2-image-sizes.h> +#include <media/v4l2-mediabus.h> +#include <media/v4l2-of.h> + +#define SENSOR_NAME "ov5647" + +#define OV5647_SW_RESET 0x0103 +#define OV5647_REG_CHIPID_H 0x300A +#define OV5647_REG_CHIPID_L 0x300B + +#define REG_TERM 0xfffe +#define VAL_TERM 0xfe +#define REG_DLY 0xffff + +#define OV5647_ROW_START 0x01 +#define OV5647_ROW_START_MIN 0 +#define OV5647_ROW_START_MAX 2004 +#define OV5647_ROW_START_DEF 54 + +#define OV5647_COLUMN_START 0x02 +#define OV5647_COLUMN_START_MIN 0 +#define OV5647_COLUMN_START_MAX 2750 +#define OV5647_COLUMN_START_DEF 16 + +#define OV5647_WINDOW_HEIGHT 0x03 +#define OV5647_WINDOW_HEIGHT_MIN 2 +#define OV5647_WINDOW_HEIGHT_MAX 2006 +#define OV5647_WINDOW_HEIGHT_DEF 1944 + +#define OV5647_WINDOW_WIDTH 0x04 +#define OV5647_WINDOW_WIDTH_MIN 2 +#define OV5647_WINDOW_WIDTH_MAX 2752 +#define OV5647_WINDOW_WIDTH_DEF 2592 + +struct regval_list { + u16 addr; + u8 data; +}; + +struct ov5647 { + struct v4l2_subdev sd; + struct media_pad pad; + struct mutex lock; + struct v4l2_mbus_framefmt format; + unsigned int width; + unsigned int height; + int power_count; + struct clk *xclk; +}; + +static inline struct ov5647 *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct ov5647, sd); +} + +static struct regval_list sensor_oe_disable_regs[] = { + {0x3000, 0x00}, + {0x3001, 0x00}, + {0x3002, 0x00}, +}; + +static struct regval_list sensor_oe_enable_regs[] = { + {0x3000, 0x0f}, + {0x3001, 0xff}, + {0x3002, 0xe4}, +}; + +static struct regval_list ov5647_640x480[] = { + {0x0100, 0x00}, + {0x0103, 0x01}, + {0x3034, 0x08}, + {0x3035, 0x21}, + {0x3036, 0x46}, + {0x303c, 0x11}, + {0x3106, 0xf5}, + {0x3821, 0x07}, + {0x3820, 0x41}, + {0x3827, 0xec}, + {0x370c, 0x0f}, + {0x3612, 0x59}, + {0x3618, 0x00}, + {0x5000, 0x06}, + {0x5001, 0x01}, + {0x5002, 0x41}, + {0x5003, 0x08}, + {0x5a00, 0x08}, + {0x3000, 0x00}, + {0x3001, 0x00}, + {0x3002, 0x00}, + {0x3016, 0x08}, + {0x3017, 0xe0}, + {0x3018, 0x44}, + {0x301c, 0xf8}, + {0x301d, 0xf0}, + {0x3a18, 0x00}, + {0x3a19, 0xf8}, + {0x3c01, 0x80}, + {0x3b07, 0x0c}, + {0x380c, 0x07}, + {0x380d, 0x68}, + {0x380e, 0x03}, + {0x380f, 0xd8}, + {0x3814, 0x31}, + {0x3815, 0x31}, + {0x3708, 0x64}, + {0x3709, 0x52}, + {0x3808, 0x02}, + {0x3809, 0x80}, + {0x380a, 0x01}, + {0x380b, 0xE0}, + {0x3801, 0x00}, + {0x3802, 0x00}, + {0x3803, 0x00}, + {0x3804, 0x0a}, + {0x3805, 0x3f}, + {0x3806, 0x07}, + {0x3807, 0xa1}, + {0x3811, 0x08}, + {0x3813, 0x02}, + {0x3630, 0x2e}, + {0x3632, 0xe2}, + {0x3633, 0x23}, + {0x3634, 0x44}, + {0x3636, 0x06}, + {0x3620, 0x64}, + {0x3621, 0xe0}, + {0x3600, 0x37}, + {0x3704, 0xa0}, + {0x3703, 0x5a}, + {0x3715, 0x78}, + {0x3717, 0x01}, + {0x3731, 0x02}, + {0x370b, 0x60}, + {0x3705, 0x1a}, + {0x3f05, 0x02}, + {0x3f06, 0x10}, + {0x3f01, 0x0a}, + {0x3a08, 0x01}, + {0x3a09, 0x27}, + {0x3a0a, 0x00}, + {0x3a0b, 0xf6}, + {0x3a0d, 0x04}, + {0x3a0e, 0x03}, + {0x3a0f, 0x58}, + {0x3a10, 0x50}, + {0x3a1b, 0x58}, + {0x3a1e, 0x50}, + {0x3a11, 0x60}, + {0x3a1f, 0x28}, + {0x4001, 0x02}, + {0x4004, 0x02}, + {0x4000, 0x09}, + {0x4837, 0x24}, + {0x4050, 0x6e}, + {0x4051, 0x8f}, + {0x0100, 0x01}, +}; + +static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val) +{ + int ret; + unsigned char data[3] = { reg >> 8, reg & 0xff, val}; + struct i2c_client *client = v4l2_get_subdevdata(sd); + + ret = i2c_master_send(client, data, 3); + if (ret < 0) + dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n", + __func__, reg); + + return ret; +} + +static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val) +{ + int ret; + unsigned char data_w[2] = { reg >> 8, reg & 0xff }; + struct i2c_client *client = v4l2_get_subdevdata(sd); + + ret = i2c_master_send(client, data_w, 2); + if (ret < 0) { + dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n", + __func__, reg); + return ret; + } + + ret = i2c_master_recv(client, val, 1); + if (ret < 0) + dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n", + __func__, reg); + + return ret; +} + +static int ov5647_write_array(struct v4l2_subdev *sd, + struct regval_list *regs, int array_size) +{ + int i, ret; + + for (i = 0; i < array_size; i++) { + ret = ov5647_write(sd, regs[i].addr, regs[i].data); + if (ret < 0) + return ret; + } + + return 0; +} + +static int ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel) +{ + u8 channel_id; + int ret; + + ret = ov5647_read(sd, 0x4814, &channel_id); + if (ret < 0) + return ret; + + channel_id &= ~(3 << 6); + return ov5647_write(sd, 0x4814, channel_id | (channel << 6)); +} + +static int ov5647_stream_on(struct v4l2_subdev *sd) +{ + int ret; + + ret = ov5647_write(sd, 0x4202, 0x00); + if (ret < 0) + return ret; + + return ov5647_write(sd, 0x300D, 0x00); +} + +static int ov5647_stream_off(struct v4l2_subdev *sd) +{ + int ret; + + ret = ov5647_write(sd, 0x4202, 0x0f); + if (ret < 0) + return ret; + + return ov5647_write(sd, 0x300D, 0x01); +} + +static int set_sw_standby(struct v4l2_subdev *sd, bool standby) +{ + int ret; + u8 rdval; + + ret = ov5647_read(sd, 0x0100, &rdval); + if (ret < 0) + return ret; + + if (standby) + rdval &= ~0x01; + else + rdval |= 0x01; + + return ov5647_write(sd, 0x0100, rdval); +} + +static int __sensor_init(struct v4l2_subdev *sd) +{ + int ret; + u8 resetval, rdval; + struct i2c_client *client = v4l2_get_subdevdata(sd); + + ret = ov5647_read(sd, 0x0100, &rdval); + if (ret < 0) + return ret; + + ret = ov5647_write_array(sd, ov5647_640x480, + ARRAY_SIZE(ov5647_640x480)); + if (ret < 0) { + dev_err(&client->dev, "write sensor default regs error\n"); + return ret; + } + + ret = ov5647_set_virtual_channel(sd, 0); + if (ret < 0) + return ret; + + ret = ov5647_read(sd, 0x0100, &resetval); + if (ret < 0) + return ret; + + if (!(resetval & 0x01)) { + dev_err(&client->dev, "Device was in SW standby"); + ret = ov5647_write(sd, 0x0100, 0x01); + if (ret < 0) + return ret; + } + + return ov5647_write(sd, 0x4800, 0x04); +} + +static int ov5647_sensor_power(struct v4l2_subdev *sd, int on) +{ + int ret = 0; + struct ov5647 *ov5647 = to_state(sd); + struct i2c_client *client = v4l2_get_subdevdata(sd); + + mutex_lock(&ov5647->lock); + + if (on && !ov5647->power_count) { + dev_dbg(&client->dev, "OV5647 power on\n"); + + ret = clk_prepare_enable(ov5647->xclk); + if (ret < 0) { + dev_err(&client->dev, "clk prepare enable failed\n"); + goto out; + } + + ret = ov5647_write_array(sd, sensor_oe_enable_regs, + ARRAY_SIZE(sensor_oe_enable_regs)); + if (ret < 0) { + clk_disable_unprepare(ov5647->xclk); + dev_err(&client->dev, + "write sensor_oe_enable_regs error\n"); + goto out; + } + + ret = __sensor_init(sd); + if (ret < 0) { + clk_disable_unprepare(ov5647->xclk); + dev_err(&client->dev, + "Camera not available, check Power\n"); + goto out; + } + } else if (!on && ov5647->power_count == 1) { + dev_dbg(&client->dev, "OV5647 power off\n"); + + ret = ov5647_write_array(sd, sensor_oe_disable_regs, + ARRAY_SIZE(sensor_oe_disable_regs)); + + if (ret < 0) + dev_dbg(&client->dev, "disable oe failed\n"); + + ret = set_sw_standby(sd, true); + + if (ret < 0) + dev_dbg(&client->dev, "soft stby failed\n"); + + clk_disable_unprepare(ov5647->xclk); + } + + /* Update the power count. */ + ov5647->power_count += on ? 1 : -1; + WARN_ON(ov5647->power_count < 0); + +out: + mutex_unlock(&ov5647->lock); + + return ret; +} + +#ifdef CONFIG_VIDEO_ADV_DEBUG +static int ov5647_sensor_get_register(struct v4l2_subdev *sd, + struct v4l2_dbg_register *reg) +{ + u8 val; + int ret; + + ret = ov5647_read(sd, reg->reg & 0xff, &val); + if (ret < 0) + return ret; + + reg->val = val; + reg->size = 1; + + return 0; +} + +static int ov5647_sensor_set_register(struct v4l2_subdev *sd, + const struct v4l2_dbg_register *reg) +{ + return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff); +} +#endif + +/** + * @short Subdev core operations registration + */ +static const struct v4l2_subdev_core_ops ov5647_subdev_core_ops = { + .s_power = ov5647_sensor_power, +#ifdef CONFIG_VIDEO_ADV_DEBUG + .g_register = ov5647_sensor_get_register, + .s_register = ov5647_sensor_set_register, +#endif +}; + +static int ov5647_s_stream(struct v4l2_subdev *sd, int enable) +{ + if (enable) + return ov5647_stream_on(sd); + else + return ov5647_stream_off(sd); +} + +static const struct v4l2_subdev_video_ops ov5647_subdev_video_ops = { + .s_stream = ov5647_s_stream, +}; + +static int ov5647_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->index > 0) + return -EINVAL; + + code->code = MEDIA_BUS_FMT_SBGGR8_1X8; + + return 0; +} + +static const struct v4l2_subdev_pad_ops ov5647_subdev_pad_ops = { + .enum_mbus_code = ov5647_enum_mbus_code, +}; + +static const struct v4l2_subdev_ops ov5647_subdev_ops = { + .core = &ov5647_subdev_core_ops, + .video = &ov5647_subdev_video_ops, + .pad = &ov5647_subdev_pad_ops, +}; + +static int ov5647_detect(struct v4l2_subdev *sd) +{ + u8 read; + int ret; + struct i2c_client *client = v4l2_get_subdevdata(sd); + + ret = ov5647_write(sd, OV5647_SW_RESET, 0x01); + if (ret < 0) + return ret; + + ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &read); + if (ret < 0) + return ret; + + if (read != 0x56) { + dev_err(&client->dev, "ID High expected 0x56 got %x", read); + return -ENODEV; + } + + ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &read); + if (ret < 0) + return ret; + + if (read != 0x47) { + dev_err(&client->dev, "ID Low expected 0x47 got %x", read); + return -ENODEV; + } + + return ov5647_write(sd, OV5647_SW_RESET, 0x00); +} + +static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + struct v4l2_mbus_framefmt *format = + v4l2_subdev_get_try_format(sd, fh->pad, 0); + struct v4l2_rect *crop = + v4l2_subdev_get_try_crop(sd, fh->pad, 0); + + crop->left = OV5647_COLUMN_START_DEF; + crop->top = OV5647_ROW_START_DEF; + crop->width = OV5647_WINDOW_WIDTH_DEF; + crop->height = OV5647_WINDOW_HEIGHT_DEF; + + format->code = MEDIA_BUS_FMT_SBGGR8_1X8; + + format->width = OV5647_WINDOW_WIDTH_DEF; + format->height = OV5647_WINDOW_HEIGHT_DEF; + format->field = V4L2_FIELD_NONE; + format->colorspace = V4L2_COLORSPACE_SRGB; + + return 0; +} + +static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = { + .open = ov5647_open, +}; + +static int ov5647_parse_dt(struct device_node *np) +{ + struct v4l2_of_endpoint bus_cfg; + struct device_node *ep; + + int ret; + + ep = of_graph_get_next_endpoint(np, NULL); + if (!ep) + return -EINVAL; + + ret = v4l2_of_parse_endpoint(ep, &bus_cfg); + + of_node_put(ep); + return ret; +} + +static int ov5647_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct ov5647 *sensor; + int ret; + struct v4l2_subdev *sd; + struct device_node *np = client->dev.of_node; + u32 xclk_freq; + + sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); + if (!sensor) + return -ENOMEM; + + if (IS_ENABLED(CONFIG_OF) && np) { + ret = ov5647_parse_dt(np); + if (ret) { + dev_err(dev, "DT parsing error: %d\n", ret); + return ret; + } + } + + /* get system clock (xclk) */ + sensor->xclk = devm_clk_get(dev, NULL); + if (IS_ERR(sensor->xclk)) { + dev_err(dev, "could not get xclk"); + return PTR_ERR(sensor->xclk); + } + + xclk_freq = clk_get_rate(sensor->xclk); + if (xclk_freq != 25000000) { + dev_err(dev, "Unsupported clock frequency: %u\n", xclk_freq); + return -EINVAL; + } + + mutex_init(&sensor->lock); + + sd = &sensor->sd; + v4l2_i2c_subdev_init(sd, client, &ov5647_subdev_ops); + sensor->sd.internal_ops = &ov5647_subdev_internal_ops; + sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + + sensor->pad.flags = MEDIA_PAD_FL_SOURCE; + sd->entity.function = MEDIA_ENT_F_CAM_SENSOR; + ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad); + if (ret < 0) + goto mutex_remove; + + ret = ov5647_detect(sd); + if (ret < 0) + goto error; + + ret = v4l2_async_register_subdev(sd); + if (ret < 0) + goto error; + + dev_dbg(dev, "OmniVision OV5647 camera driver probed\n"); + return 0; +error: + media_entity_cleanup(&sd->entity); +mutex_remove: + mutex_destroy(&sensor->lock); + return ret; +} + +static int ov5647_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct ov5647 *ov5647 = to_state(sd); + + v4l2_async_unregister_subdev(&ov5647->sd); + media_entity_cleanup(&ov5647->sd.entity); + v4l2_device_unregister_subdev(sd); + mutex_destroy(&ov5647->lock); + + return 0; +} + +static const struct i2c_device_id ov5647_id[] = { + { "ov5647", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ov5647_id); + +#if IS_ENABLED(CONFIG_OF) +static const struct of_device_id ov5647_of_match[] = { + { .compatible = "ovti,ov5647" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ov5647_of_match); +#endif + +static struct i2c_driver ov5647_driver = { + .driver = { + .of_match_table = of_match_ptr(ov5647_of_match), + .name = SENSOR_NAME, + }, + .probe = ov5647_probe, + .remove = ov5647_remove, + .id_table = ov5647_id, +}; + +module_i2c_driver(ov5647_driver); + +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>"); +MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors"); +MODULE_LICENSE("GPL v2"); |