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.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/videodev2.h>
22 #include <linux/ioctl.h>
23 #include <linux/slab.h>
24 #include <media/v4l2-subdev.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
28 #define TW2804_REG_AUTOGAIN 0x02
29 #define TW2804_REG_HUE 0x0f
30 #define TW2804_REG_SATURATION 0x10
31 #define TW2804_REG_CONTRAST 0x11
32 #define TW2804_REG_BRIGHTNESS 0x12
33 #define TW2804_REG_COLOR_KILLER 0x14
34 #define TW2804_REG_GAIN 0x3c
35 #define TW2804_REG_CHROMA_GAIN 0x3d
36 #define TW2804_REG_BLUE_BALANCE 0x3e
37 #define TW2804_REG_RED_BALANCE 0x3f
40 struct v4l2_subdev sd;
41 struct v4l2_ctrl_handler hdl;
47 static const u8 global_registers[] = {
56 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
59 static const u8 channel_registers[] = {
115 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
118 static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
120 return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
123 static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)
128 for (i = 0; regs[i] != 0xff; i += 2) {
129 ret = i2c_smbus_write_byte_data(client,
130 regs[i] | (channel << 6), regs[i + 1]);
137 static int read_reg(struct i2c_client *client, u8 reg, u8 channel)
139 return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
142 static inline struct tw2804 *to_state(struct v4l2_subdev *sd)
144 return container_of(sd, struct tw2804, sd);
147 static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)
149 return container_of(ctrl->handler, struct tw2804, hdl);
152 static int tw2804_log_status(struct v4l2_subdev *sd)
154 struct tw2804 *state = to_state(sd);
156 v4l2_info(sd, "Standard: %s\n",
157 state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz");
158 v4l2_info(sd, "Channel: %d\n", state->channel);
159 v4l2_info(sd, "Input: %d\n", state->input);
160 return v4l2_ctrl_subdev_log_status(sd);
164 * These volatile controls are needed because all four channels share
165 * these controls. So a change made to them through one channel would
166 * require another channel to be updated.
168 * Normally this would have been done in a different way, but since the one
169 * board that uses this driver sees this single chip as if it was on four
170 * different i2c adapters (each adapter belonging to a separate instance of
171 * the same USB driver) there is no reliable method that I have found to let
172 * the instances know about each other.
174 * So implementing these global registers as volatile is the best we can do.
176 static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
178 struct tw2804 *state = to_state_from_ctrl(ctrl);
179 struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
183 ctrl->val = read_reg(client, TW2804_REG_GAIN, 0);
186 case V4L2_CID_CHROMA_GAIN:
187 ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0);
190 case V4L2_CID_BLUE_BALANCE:
191 ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0);
194 case V4L2_CID_RED_BALANCE:
195 ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0);
201 static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)
203 struct tw2804 *state = to_state_from_ctrl(ctrl);
204 struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
209 case V4L2_CID_AUTOGAIN:
210 addr = TW2804_REG_AUTOGAIN;
211 reg = read_reg(client, addr, state->channel);
218 return write_reg(client, addr, reg, state->channel);
220 case V4L2_CID_COLOR_KILLER:
221 addr = TW2804_REG_COLOR_KILLER;
222 reg = read_reg(client, addr, state->channel);
225 reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);
226 return write_reg(client, addr, reg, state->channel);
229 return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0);
231 case V4L2_CID_CHROMA_GAIN:
232 return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0);
234 case V4L2_CID_BLUE_BALANCE:
235 return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0);
237 case V4L2_CID_RED_BALANCE:
238 return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0);
240 case V4L2_CID_BRIGHTNESS:
241 return write_reg(client, TW2804_REG_BRIGHTNESS,
242 ctrl->val, state->channel);
244 case V4L2_CID_CONTRAST:
245 return write_reg(client, TW2804_REG_CONTRAST,
246 ctrl->val, state->channel);
248 case V4L2_CID_SATURATION:
249 return write_reg(client, TW2804_REG_SATURATION,
250 ctrl->val, state->channel);
253 return write_reg(client, TW2804_REG_HUE,
254 ctrl->val, state->channel);
262 static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
264 struct tw2804 *dec = to_state(sd);
265 struct i2c_client *client = v4l2_get_subdevdata(sd);
266 bool is_60hz = norm & V4L2_STD_525_60;
268 0x01, is_60hz ? 0xc4 : 0x84,
269 0x09, is_60hz ? 0x07 : 0x04,
270 0x0a, is_60hz ? 0xf0 : 0x20,
271 0x0b, is_60hz ? 0x07 : 0x04,
272 0x0c, is_60hz ? 0xf0 : 0x20,
273 0x0d, is_60hz ? 0x40 : 0x4a,
274 0x16, is_60hz ? 0x00 : 0x40,
275 0x17, is_60hz ? 0x00 : 0x40,
276 0x20, is_60hz ? 0x07 : 0x0f,
277 0x21, is_60hz ? 0x07 : 0x0f,
281 write_regs(client, regs, dec->channel);
286 static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
289 struct tw2804 *dec = to_state(sd);
290 struct i2c_client *client = v4l2_get_subdevdata(sd);
293 if (config && config - 1 != dec->channel) {
295 dev_err(&client->dev,
296 "channel %d is not between 1 and 4!\n", config);
299 dec->channel = config - 1;
300 dev_dbg(&client->dev, "initializing TW2804 channel %d\n",
302 if (dec->channel == 0 &&
303 write_regs(client, global_registers, 0) < 0) {
304 dev_err(&client->dev,
305 "error initializing TW2804 global registers\n");
308 if (write_regs(client, channel_registers, dec->channel) < 0) {
309 dev_err(&client->dev,
310 "error initializing TW2804 channel %d\n",
319 if (input == dec->input)
322 reg = read_reg(client, 0x22, dec->channel);
329 reg = write_reg(client, 0x22, reg, dec->channel);
339 static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {
340 .g_volatile_ctrl = tw2804_g_volatile_ctrl,
341 .s_ctrl = tw2804_s_ctrl,
344 static const struct v4l2_subdev_video_ops tw2804_video_ops = {
345 .s_routing = tw2804_s_video_routing,
348 static const struct v4l2_subdev_core_ops tw2804_core_ops = {
349 .log_status = tw2804_log_status,
350 .s_std = tw2804_s_std,
353 static const struct v4l2_subdev_ops tw2804_ops = {
354 .core = &tw2804_core_ops,
355 .video = &tw2804_video_ops,
358 static int tw2804_probe(struct i2c_client *client,
359 const struct i2c_device_id *id)
361 struct i2c_adapter *adapter = client->adapter;
362 struct tw2804 *state;
363 struct v4l2_subdev *sd;
364 struct v4l2_ctrl *ctrl;
367 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
370 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
374 v4l2_i2c_subdev_init(sd, client, &tw2804_ops);
376 state->norm = V4L2_STD_NTSC;
378 v4l2_ctrl_handler_init(&state->hdl, 10);
379 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
380 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
381 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
382 V4L2_CID_CONTRAST, 0, 255, 1, 128);
383 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
384 V4L2_CID_SATURATION, 0, 255, 1, 128);
385 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
386 V4L2_CID_HUE, 0, 255, 1, 128);
387 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
388 V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
389 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
390 V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
391 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
392 V4L2_CID_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_CHROMA_GAIN, 0, 255, 1, 128);
398 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
399 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
400 V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122);
402 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
403 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
404 V4L2_CID_RED_BALANCE, 0, 255, 1, 122);
406 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
407 sd->ctrl_handler = &state->hdl;
408 err = state->hdl.error;
410 v4l2_ctrl_handler_free(&state->hdl);
414 v4l_info(client, "chip found @ 0x%02x (%s)\n",
415 client->addr << 1, client->adapter->name);
420 static int tw2804_remove(struct i2c_client *client)
422 struct v4l2_subdev *sd = i2c_get_clientdata(client);
423 struct tw2804 *state = to_state(sd);
425 v4l2_device_unregister_subdev(sd);
426 v4l2_ctrl_handler_free(&state->hdl);
430 static const struct i2c_device_id tw2804_id[] = {
434 MODULE_DEVICE_TABLE(i2c, tw2804_id);
436 static struct i2c_driver tw2804_driver = {
440 .probe = tw2804_probe,
441 .remove = tw2804_remove,
442 .id_table = tw2804_id,
445 module_i2c_driver(tw2804_driver);
447 MODULE_LICENSE("GPL v2");
448 MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");
449 MODULE_AUTHOR("Micronas USA Inc");