diff options
Diffstat (limited to 'drivers/media/i2c/tw2804.c')
| -rw-r--r-- | drivers/media/i2c/tw2804.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/drivers/media/i2c/tw2804.c b/drivers/media/i2c/tw2804.c new file mode 100644 index 000000000..c7c8dfe8a --- /dev/null +++ b/drivers/media/i2c/tw2804.c @@ -0,0 +1,436 @@ +// 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-subdev.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ctrls.h> + +#define TW2804_REG_AUTOGAIN 0x02 +#define TW2804_REG_HUE 0x0f +#define TW2804_REG_SATURATION 0x10 +#define TW2804_REG_CONTRAST 0x11 +#define TW2804_REG_BRIGHTNESS 0x12 +#define TW2804_REG_COLOR_KILLER 0x14 +#define TW2804_REG_GAIN 0x3c +#define TW2804_REG_CHROMA_GAIN 0x3d +#define TW2804_REG_BLUE_BALANCE 0x3e +#define TW2804_REG_RED_BALANCE 0x3f + +struct tw2804 { + struct v4l2_subdev sd; + struct v4l2_ctrl_handler hdl; + u8 channel:2; + u8 input:1; + int norm; +}; + +static const u8 global_registers[] = { + 0x39, 0x00, + 0x3a, 0xff, + 0x3b, 0x84, + 0x3c, 0x80, + 0x3d, 0x80, + 0x3e, 0x82, + 0x3f, 0x82, + 0x78, 0x00, + 0xff, 0xff, /* Terminator (reg 0xff does not exist) */ +}; + +static const u8 channel_registers[] = { + 0x01, 0xc4, + 0x02, 0xa5, + 0x03, 0x20, + 0x04, 0xd0, + 0x05, 0x20, + 0x06, 0xd0, + 0x07, 0x88, + 0x08, 0x20, + 0x09, 0x07, + 0x0a, 0xf0, + 0x0b, 0x07, + 0x0c, 0xf0, + 0x0d, 0x40, + 0x0e, 0xd2, + 0x0f, 0x80, + 0x10, 0x80, + 0x11, 0x80, + 0x12, 0x80, + 0x13, 0x1f, + 0x14, 0x00, + 0x15, 0x00, + 0x16, 0x00, + 0x17, 0x00, + 0x18, 0xff, + 0x19, 0xff, + 0x1a, 0xff, + 0x1b, 0xff, + 0x1c, 0xff, + 0x1d, 0xff, + 0x1e, 0xff, + 0x1f, 0xff, + 0x20, 0x07, + 0x21, 0x07, + 0x22, 0x00, + 0x23, 0x91, + 0x24, 0x51, + 0x25, 0x03, + 0x26, 0x00, + 0x27, 0x00, + 0x28, 0x00, + 0x29, 0x00, + 0x2a, 0x00, + 0x2b, 0x00, + 0x2c, 0x00, + 0x2d, 0x00, + 0x2e, 0x00, + 0x2f, 0x00, + 0x30, 0x00, + 0x31, 0x00, + 0x32, 0x00, + 0x33, 0x00, + 0x34, 0x00, + 0x35, 0x00, + 0x36, 0x00, + 0x37, 0x00, + 0xff, 0xff, /* Terminator (reg 0xff does not exist) */ +}; + +static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel) +{ + return i2c_smbus_write_byte_data(client, reg | (channel << 6), value); +} + +static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel) +{ + int ret; + int i; + + for (i = 0; regs[i] != 0xff; i += 2) { + ret = i2c_smbus_write_byte_data(client, + regs[i] | (channel << 6), regs[i + 1]); + if (ret < 0) + return ret; + } + return 0; +} + +static int read_reg(struct i2c_client *client, u8 reg, u8 channel) +{ + return i2c_smbus_read_byte_data(client, (reg) | (channel << 6)); +} + +static inline struct tw2804 *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct tw2804, sd); +} + +static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl) +{ + return container_of(ctrl->handler, struct tw2804, hdl); +} + +static int tw2804_log_status(struct v4l2_subdev *sd) +{ + struct tw2804 *state = to_state(sd); + + v4l2_info(sd, "Standard: %s\n", + state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz"); + v4l2_info(sd, "Channel: %d\n", state->channel); + v4l2_info(sd, "Input: %d\n", state->input); + return v4l2_ctrl_subdev_log_status(sd); +} + +/* + * These volatile controls are needed because all four channels share + * these controls. So a change made to them through one channel would + * require another channel to be updated. + * + * Normally this would have been done in a different way, but since the one + * board that uses this driver sees this single chip as if it was on four + * different i2c adapters (each adapter belonging to a separate instance of + * the same USB driver) there is no reliable method that I have found to let + * the instances know about each other. + * + * So implementing these global registers as volatile is the best we can do. + */ +static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl) +{ + struct tw2804 *state = to_state_from_ctrl(ctrl); + struct i2c_client *client = v4l2_get_subdevdata(&state->sd); + + switch (ctrl->id) { + case V4L2_CID_GAIN: + ctrl->val = read_reg(client, TW2804_REG_GAIN, 0); + return 0; + + case V4L2_CID_CHROMA_GAIN: + ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0); + return 0; + + case V4L2_CID_BLUE_BALANCE: + ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0); + return 0; + + case V4L2_CID_RED_BALANCE: + ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0); + return 0; + } + return 0; +} + +static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct tw2804 *state = to_state_from_ctrl(ctrl); + struct i2c_client *client = v4l2_get_subdevdata(&state->sd); + int addr; + int reg; + + switch (ctrl->id) { + case V4L2_CID_AUTOGAIN: + addr = TW2804_REG_AUTOGAIN; + reg = read_reg(client, addr, state->channel); + if (reg < 0) + return reg; + if (ctrl->val == 0) + reg &= ~(1 << 7); + else + reg |= 1 << 7; + return write_reg(client, addr, reg, state->channel); + + case V4L2_CID_COLOR_KILLER: + addr = TW2804_REG_COLOR_KILLER; + reg = read_reg(client, addr, state->channel); + if (reg < 0) + return reg; + reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03); + return write_reg(client, addr, reg, state->channel); + + case V4L2_CID_GAIN: + return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0); + + case V4L2_CID_CHROMA_GAIN: + return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0); + + case V4L2_CID_BLUE_BALANCE: + return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0); + + case V4L2_CID_RED_BALANCE: + return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0); + + case V4L2_CID_BRIGHTNESS: + return write_reg(client, TW2804_REG_BRIGHTNESS, + ctrl->val, state->channel); + + case V4L2_CID_CONTRAST: + return write_reg(client, TW2804_REG_CONTRAST, + ctrl->val, state->channel); + + case V4L2_CID_SATURATION: + return write_reg(client, TW2804_REG_SATURATION, + ctrl->val, state->channel); + + case V4L2_CID_HUE: + return write_reg(client, TW2804_REG_HUE, + ctrl->val, state->channel); + + default: + break; + } + return -EINVAL; +} + +static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) +{ + struct tw2804 *dec = to_state(sd); + struct i2c_client *client = v4l2_get_subdevdata(sd); + bool is_60hz = norm & V4L2_STD_525_60; + u8 regs[] = { + 0x01, is_60hz ? 0xc4 : 0x84, + 0x09, is_60hz ? 0x07 : 0x04, + 0x0a, is_60hz ? 0xf0 : 0x20, + 0x0b, is_60hz ? 0x07 : 0x04, + 0x0c, is_60hz ? 0xf0 : 0x20, + 0x0d, is_60hz ? 0x40 : 0x4a, + 0x16, is_60hz ? 0x00 : 0x40, + 0x17, is_60hz ? 0x00 : 0x40, + 0x20, is_60hz ? 0x07 : 0x0f, + 0x21, is_60hz ? 0x07 : 0x0f, + 0xff, 0xff, + }; + + write_regs(client, regs, dec->channel); + dec->norm = norm; + return 0; +} + +static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output, + u32 config) +{ + struct tw2804 *dec = to_state(sd); + struct i2c_client *client = v4l2_get_subdevdata(sd); + int reg; + + if (config && config - 1 != dec->channel) { + if (config > 4) { + dev_err(&client->dev, + "channel %d is not between 1 and 4!\n", config); + return -EINVAL; + } + dec->channel = config - 1; + dev_dbg(&client->dev, "initializing TW2804 channel %d\n", + dec->channel); + if (dec->channel == 0 && + write_regs(client, global_registers, 0) < 0) { + dev_err(&client->dev, + "error initializing TW2804 global registers\n"); + return -EIO; + } + if (write_regs(client, channel_registers, dec->channel) < 0) { + dev_err(&client->dev, + "error initializing TW2804 channel %d\n", + dec->channel); + return -EIO; + } + } + + if (input > 1) + return -EINVAL; + + if (input == dec->input) + return 0; + + reg = read_reg(client, 0x22, dec->channel); + + if (reg >= 0) { + if (input == 0) + reg &= ~(1 << 2); + else + reg |= 1 << 2; + reg = write_reg(client, 0x22, reg, dec->channel); + } + + if (reg >= 0) + dec->input = input; + else + return reg; + return 0; +} + +static const struct v4l2_ctrl_ops tw2804_ctrl_ops = { + .g_volatile_ctrl = tw2804_g_volatile_ctrl, + .s_ctrl = tw2804_s_ctrl, +}; + +static const struct v4l2_subdev_video_ops tw2804_video_ops = { + .s_std = tw2804_s_std, + .s_routing = tw2804_s_video_routing, +}; + +static const struct v4l2_subdev_core_ops tw2804_core_ops = { + .log_status = tw2804_log_status, +}; + +static const struct v4l2_subdev_ops tw2804_ops = { + .core = &tw2804_core_ops, + .video = &tw2804_video_ops, +}; + +static int tw2804_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = client->adapter; + struct tw2804 *state; + struct v4l2_subdev *sd; + struct v4l2_ctrl *ctrl; + int err; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + sd = &state->sd; + v4l2_i2c_subdev_init(sd, client, &tw2804_ops); + state->channel = -1; + state->norm = V4L2_STD_NTSC; + + v4l2_ctrl_handler_init(&state->hdl, 10); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_BRIGHTNESS, 0, 255, 1, 128); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_CONTRAST, 0, 255, 1, 128); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_SATURATION, 0, 255, 1, 128); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_HUE, 0, 255, 1, 128); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_COLOR_KILLER, 0, 1, 1, 0); + v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_AUTOGAIN, 0, 1, 1, 0); + ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_GAIN, 0, 255, 1, 128); + if (ctrl) + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; + ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128); + if (ctrl) + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; + ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122); + if (ctrl) + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; + ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, + V4L2_CID_RED_BALANCE, 0, 255, 1, 122); + if (ctrl) + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; + sd->ctrl_handler = &state->hdl; + err = state->hdl.error; + if (err) { + v4l2_ctrl_handler_free(&state->hdl); + return err; + } + + v4l_info(client, "chip found @ 0x%02x (%s)\n", + client->addr << 1, client->adapter->name); + + return 0; +} + +static void tw2804_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct tw2804 *state = to_state(sd); + + v4l2_device_unregister_subdev(sd); + v4l2_ctrl_handler_free(&state->hdl); +} + +static const struct i2c_device_id tw2804_id[] = { + { "tw2804", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tw2804_id); + +static struct i2c_driver tw2804_driver = { + .driver = { + .name = "tw2804", + }, + .probe = tw2804_probe, + .remove = tw2804_remove, + .id_table = tw2804_id, +}; + +module_i2c_driver(tw2804_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver"); +MODULE_AUTHOR("Micronas USA Inc"); |