diff options
Diffstat (limited to 'drivers/media/i2c/tw9906.c')
| -rw-r--r-- | drivers/media/i2c/tw9906.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/media/i2c/tw9906.c b/drivers/media/i2c/tw9906.c new file mode 100644 index 000000000..c528eb01f --- /dev/null +++ b/drivers/media/i2c/tw9906.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2005-2006 Micronas USA Inc. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/videodev2.h> +#include <linux/ioctl.h> +#include <linux/slab.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ctrls.h> + +MODULE_DESCRIPTION("TW9906 I2C subdev driver"); +MODULE_LICENSE("GPL v2"); + +struct tw9906 { + struct v4l2_subdev sd; + struct v4l2_ctrl_handler hdl; + v4l2_std_id norm; +}; + +static inline struct tw9906 *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct tw9906, sd); +} + +static const u8 initial_registers[] = { + 0x02, 0x40, /* input 0, composite */ + 0x03, 0xa2, /* correct digital format */ + 0x05, 0x81, /* or 0x01 for PAL */ + 0x07, 0x02, /* window */ + 0x08, 0x14, /* window */ + 0x09, 0xf0, /* window */ + 0x0a, 0x10, /* window */ + 0x0b, 0xd0, /* window */ + 0x0d, 0x00, /* scaling */ + 0x0e, 0x11, /* scaling */ + 0x0f, 0x00, /* scaling */ + 0x10, 0x00, /* brightness */ + 0x11, 0x60, /* contrast */ + 0x12, 0x11, /* sharpness */ + 0x13, 0x7e, /* U gain */ + 0x14, 0x7e, /* V gain */ + 0x15, 0x00, /* hue */ + 0x19, 0x57, /* vbi */ + 0x1a, 0x0f, + 0x1b, 0x40, + 0x29, 0x03, + 0x55, 0x00, + 0x6b, 0x26, + 0x6c, 0x36, + 0x6d, 0xf0, + 0x6e, 0x41, + 0x6f, 0x13, + 0xad, 0x70, + 0x00, 0x00, /* Terminator (reg 0x00 is read-only) */ +}; + +static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + return i2c_smbus_write_byte_data(client, reg, value); +} + +static int write_regs(struct v4l2_subdev *sd, const u8 *regs) +{ + int i; + + for (i = 0; regs[i] != 0x00; i += 2) + if (write_reg(sd, regs[i], regs[i + 1]) < 0) + return -1; + return 0; +} + +static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input, + u32 output, u32 config) +{ + write_reg(sd, 0x02, 0x40 | (input << 1)); + return 0; +} + +static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) +{ + struct tw9906 *dec = to_state(sd); + bool is_60hz = norm & V4L2_STD_525_60; + static const u8 config_60hz[] = { + 0x05, 0x81, + 0x07, 0x02, + 0x08, 0x14, + 0x09, 0xf0, + 0, 0, + }; + static const u8 config_50hz[] = { + 0x05, 0x01, + 0x07, 0x12, + 0x08, 0x18, + 0x09, 0x20, + 0, 0, + }; + + write_regs(sd, is_60hz ? config_60hz : config_50hz); + dec->norm = norm; + return 0; +} + +static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl); + struct v4l2_subdev *sd = &dec->sd; + + switch (ctrl->id) { + case V4L2_CID_BRIGHTNESS: + write_reg(sd, 0x10, ctrl->val); + break; + case V4L2_CID_CONTRAST: + write_reg(sd, 0x11, ctrl->val); + break; + case V4L2_CID_HUE: + write_reg(sd, 0x15, ctrl->val); + break; + default: + return -EINVAL; + } + return 0; +} + +static int tw9906_log_status(struct v4l2_subdev *sd) +{ + struct tw9906 *dec = to_state(sd); + bool is_60hz = dec->norm & V4L2_STD_525_60; + + v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50); + v4l2_ctrl_subdev_log_status(sd); + return 0; +} + +/* --------------------------------------------------------------------------*/ + +static const struct v4l2_ctrl_ops tw9906_ctrl_ops = { + .s_ctrl = tw9906_s_ctrl, +}; + +static const struct v4l2_subdev_core_ops tw9906_core_ops = { + .log_status = tw9906_log_status, +}; + +static const struct v4l2_subdev_video_ops tw9906_video_ops = { + .s_std = tw9906_s_std, + .s_routing = tw9906_s_video_routing, +}; + +static const struct v4l2_subdev_ops tw9906_ops = { + .core = &tw9906_core_ops, + .video = &tw9906_video_ops, +}; + +static int tw9906_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tw9906 *dec; + struct v4l2_subdev *sd; + struct v4l2_ctrl_handler *hdl; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + v4l_info(client, "chip found @ 0x%02x (%s)\n", + client->addr << 1, client->adapter->name); + + dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL); + if (dec == NULL) + return -ENOMEM; + sd = &dec->sd; + v4l2_i2c_subdev_init(sd, client, &tw9906_ops); + hdl = &dec->hdl; + v4l2_ctrl_handler_init(hdl, 4); + v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, + V4L2_CID_BRIGHTNESS, -128, 127, 1, 0); + v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, + V4L2_CID_CONTRAST, 0, 255, 1, 0x60); + v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, + V4L2_CID_HUE, -128, 127, 1, 0); + sd->ctrl_handler = hdl; + if (hdl->error) { + int err = hdl->error; + + v4l2_ctrl_handler_free(hdl); + return err; + } + + /* Initialize tw9906 */ + dec->norm = V4L2_STD_NTSC; + + if (write_regs(sd, initial_registers) < 0) { + v4l2_err(client, "error initializing TW9906\n"); + return -EINVAL; + } + + return 0; +} + +static int tw9906_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + + v4l2_device_unregister_subdev(sd); + v4l2_ctrl_handler_free(&to_state(sd)->hdl); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct i2c_device_id tw9906_id[] = { + { "tw9906", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tw9906_id); + +static struct i2c_driver tw9906_driver = { + .driver = { + .name = "tw9906", + }, + .probe = tw9906_probe, + .remove = tw9906_remove, + .id_table = tw9906_id, +}; +module_i2c_driver(tw9906_driver); |