2 * Copyright (C) 2005-2006 Micronas USA Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/i2c.h>
17 #include <linux/videodev2.h>
18 #include <linux/ioctl.h>
19 #include <linux/slab.h>
20 #include <media/v4l2-subdev.h>
21 #include <media/v4l2-device.h>
22 #include <media/v4l2-ctrls.h>
24 #define TW2804_REG_AUTOGAIN 0x02
25 #define TW2804_REG_HUE 0x0f
26 #define TW2804_REG_SATURATION 0x10
27 #define TW2804_REG_CONTRAST 0x11
28 #define TW2804_REG_BRIGHTNESS 0x12
29 #define TW2804_REG_COLOR_KILLER 0x14
30 #define TW2804_REG_GAIN 0x3c
31 #define TW2804_REG_CHROMA_GAIN 0x3d
32 #define TW2804_REG_BLUE_BALANCE 0x3e
33 #define TW2804_REG_RED_BALANCE 0x3f
36 struct v4l2_subdev sd;
37 struct v4l2_ctrl_handler hdl;
43 static const u8 global_registers[] = {
52 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
55 static const u8 channel_registers[] = {
111 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
114 static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
116 return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
119 static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)
124 for (i = 0; regs[i] != 0xff; i += 2) {
125 ret = i2c_smbus_write_byte_data(client,
126 regs[i] | (channel << 6), regs[i + 1]);
133 static int read_reg(struct i2c_client *client, u8 reg, u8 channel)
135 return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
138 static inline struct tw2804 *to_state(struct v4l2_subdev *sd)
140 return container_of(sd, struct tw2804, sd);
143 static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)
145 return container_of(ctrl->handler, struct tw2804, hdl);
148 static int tw2804_log_status(struct v4l2_subdev *sd)
150 struct tw2804 *state = to_state(sd);
152 v4l2_info(sd, "Standard: %s\n",
153 state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz");
154 v4l2_info(sd, "Channel: %d\n", state->channel);
155 v4l2_info(sd, "Input: %d\n", state->input);
156 return v4l2_ctrl_subdev_log_status(sd);
160 * These volatile controls are needed because all four channels share
161 * these controls. So a change made to them through one channel would
162 * require another channel to be updated.
164 * Normally this would have been done in a different way, but since the one
165 * board that uses this driver sees this single chip as if it was on four
166 * different i2c adapters (each adapter belonging to a separate instance of
167 * the same USB driver) there is no reliable method that I have found to let
168 * the instances know about each other.
170 * So implementing these global registers as volatile is the best we can do.
172 static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
174 struct tw2804 *state = to_state_from_ctrl(ctrl);
175 struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
179 ctrl->val = read_reg(client, TW2804_REG_GAIN, 0);
182 case V4L2_CID_CHROMA_GAIN:
183 ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0);
186 case V4L2_CID_BLUE_BALANCE:
187 ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0);
190 case V4L2_CID_RED_BALANCE:
191 ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0);
197 static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)
199 struct tw2804 *state = to_state_from_ctrl(ctrl);
200 struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
205 case V4L2_CID_AUTOGAIN:
206 addr = TW2804_REG_AUTOGAIN;
207 reg = read_reg(client, addr, state->channel);
214 return write_reg(client, addr, reg, state->channel);
216 case V4L2_CID_COLOR_KILLER:
217 addr = TW2804_REG_COLOR_KILLER;
218 reg = read_reg(client, addr, state->channel);
221 reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);
222 return write_reg(client, addr, reg, state->channel);
225 return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0);
227 case V4L2_CID_CHROMA_GAIN:
228 return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0);
230 case V4L2_CID_BLUE_BALANCE:
231 return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0);
233 case V4L2_CID_RED_BALANCE:
234 return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0);
236 case V4L2_CID_BRIGHTNESS:
237 return write_reg(client, TW2804_REG_BRIGHTNESS,
238 ctrl->val, state->channel);
240 case V4L2_CID_CONTRAST:
241 return write_reg(client, TW2804_REG_CONTRAST,
242 ctrl->val, state->channel);
244 case V4L2_CID_SATURATION:
245 return write_reg(client, TW2804_REG_SATURATION,
246 ctrl->val, state->channel);
249 return write_reg(client, TW2804_REG_HUE,
250 ctrl->val, state->channel);
258 static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
260 struct tw2804 *dec = to_state(sd);
261 struct i2c_client *client = v4l2_get_subdevdata(sd);
262 bool is_60hz = norm & V4L2_STD_525_60;
264 0x01, is_60hz ? 0xc4 : 0x84,
265 0x09, is_60hz ? 0x07 : 0x04,
266 0x0a, is_60hz ? 0xf0 : 0x20,
267 0x0b, is_60hz ? 0x07 : 0x04,
268 0x0c, is_60hz ? 0xf0 : 0x20,
269 0x0d, is_60hz ? 0x40 : 0x4a,
270 0x16, is_60hz ? 0x00 : 0x40,
271 0x17, is_60hz ? 0x00 : 0x40,
272 0x20, is_60hz ? 0x07 : 0x0f,
273 0x21, is_60hz ? 0x07 : 0x0f,
277 write_regs(client, regs, dec->channel);
282 static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
285 struct tw2804 *dec = to_state(sd);
286 struct i2c_client *client = v4l2_get_subdevdata(sd);
289 if (config && config - 1 != dec->channel) {
291 dev_err(&client->dev,
292 "channel %d is not between 1 and 4!\n", config);
295 dec->channel = config - 1;
296 dev_dbg(&client->dev, "initializing TW2804 channel %d\n",
298 if (dec->channel == 0 &&
299 write_regs(client, global_registers, 0) < 0) {
300 dev_err(&client->dev,
301 "error initializing TW2804 global registers\n");
304 if (write_regs(client, channel_registers, dec->channel) < 0) {
305 dev_err(&client->dev,
306 "error initializing TW2804 channel %d\n",
315 if (input == dec->input)
318 reg = read_reg(client, 0x22, dec->channel);
325 reg = write_reg(client, 0x22, reg, dec->channel);
335 static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {
336 .g_volatile_ctrl = tw2804_g_volatile_ctrl,
337 .s_ctrl = tw2804_s_ctrl,
340 static const struct v4l2_subdev_video_ops tw2804_video_ops = {
341 .s_std = tw2804_s_std,
342 .s_routing = tw2804_s_video_routing,
345 static const struct v4l2_subdev_core_ops tw2804_core_ops = {
346 .log_status = tw2804_log_status,
349 static const struct v4l2_subdev_ops tw2804_ops = {
350 .core = &tw2804_core_ops,
351 .video = &tw2804_video_ops,
354 static int tw2804_probe(struct i2c_client *client,
355 const struct i2c_device_id *id)
357 struct i2c_adapter *adapter = client->adapter;
358 struct tw2804 *state;
359 struct v4l2_subdev *sd;
360 struct v4l2_ctrl *ctrl;
363 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
366 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
370 v4l2_i2c_subdev_init(sd, client, &tw2804_ops);
372 state->norm = V4L2_STD_NTSC;
374 v4l2_ctrl_handler_init(&state->hdl, 10);
375 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
376 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
377 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
378 V4L2_CID_CONTRAST, 0, 255, 1, 128);
379 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
380 V4L2_CID_SATURATION, 0, 255, 1, 128);
381 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
382 V4L2_CID_HUE, 0, 255, 1, 128);
383 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
384 V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
385 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
386 V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
387 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
388 V4L2_CID_GAIN, 0, 255, 1, 128);
390 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
391 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
392 V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128);
394 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
395 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
396 V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122);
398 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
399 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
400 V4L2_CID_RED_BALANCE, 0, 255, 1, 122);
402 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
403 sd->ctrl_handler = &state->hdl;
404 err = state->hdl.error;
406 v4l2_ctrl_handler_free(&state->hdl);
410 v4l_info(client, "chip found @ 0x%02x (%s)\n",
411 client->addr << 1, client->adapter->name);
416 static int tw2804_remove(struct i2c_client *client)
418 struct v4l2_subdev *sd = i2c_get_clientdata(client);
419 struct tw2804 *state = to_state(sd);
421 v4l2_device_unregister_subdev(sd);
422 v4l2_ctrl_handler_free(&state->hdl);
426 static const struct i2c_device_id tw2804_id[] = {
430 MODULE_DEVICE_TABLE(i2c, tw2804_id);
432 static struct i2c_driver tw2804_driver = {
436 .probe = tw2804_probe,
437 .remove = tw2804_remove,
438 .id_table = tw2804_id,
441 module_i2c_driver(tw2804_driver);
443 MODULE_LICENSE("GPL v2");
444 MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");
445 MODULE_AUTHOR("Micronas USA Inc");