1 /*
2 * ths8200 - Texas Instruments THS8200 video encoder driver
3 *
4 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation version 2.
13 *
14 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
15 * kind, whether express or implied; without even the implied warranty
16 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20 #include <linux/i2c.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/v4l2-dv-timings.h>
24
25 #include <media/v4l2-dv-timings.h>
26 #include <media/v4l2-async.h>
27 #include <media/v4l2-device.h>
28
29 #include "ths8200_regs.h"
30
31 static int debug;
32 module_param(debug, int, 0644);
33 MODULE_PARM_DESC(debug, "debug level (0-2)");
34
35 MODULE_DESCRIPTION("Texas Instruments THS8200 video encoder driver");
36 MODULE_AUTHOR("Mats Randgaard <mats.randgaard@cisco.com>");
37 MODULE_AUTHOR("Martin Bugge <martin.bugge@cisco.com>");
38 MODULE_LICENSE("GPL v2");
39
40 struct ths8200_state {
41 struct v4l2_subdev sd;
42 uint8_t chip_version;
43 /* Is the ths8200 powered on? */
44 bool power_on;
45 struct v4l2_dv_timings dv_timings;
46 };
47
48 static const struct v4l2_dv_timings_cap ths8200_timings_cap = {
49 .type = V4L2_DV_BT_656_1120,
50 /* keep this initialization for compatibility with GCC < 4.4.6 */
51 .reserved = { 0 },
52 V4L2_INIT_BT_TIMINGS(640, 1920, 350, 1080, 25000000, 148500000,
53 V4L2_DV_BT_STD_CEA861, V4L2_DV_BT_CAP_PROGRESSIVE)
54 };
55
to_state(struct v4l2_subdev * sd)56 static inline struct ths8200_state *to_state(struct v4l2_subdev *sd)
57 {
58 return container_of(sd, struct ths8200_state, sd);
59 }
60
htotal(const struct v4l2_bt_timings * t)61 static inline unsigned htotal(const struct v4l2_bt_timings *t)
62 {
63 return V4L2_DV_BT_FRAME_WIDTH(t);
64 }
65
vtotal(const struct v4l2_bt_timings * t)66 static inline unsigned vtotal(const struct v4l2_bt_timings *t)
67 {
68 return V4L2_DV_BT_FRAME_HEIGHT(t);
69 }
70
ths8200_read(struct v4l2_subdev * sd,u8 reg)71 static int ths8200_read(struct v4l2_subdev *sd, u8 reg)
72 {
73 struct i2c_client *client = v4l2_get_subdevdata(sd);
74
75 return i2c_smbus_read_byte_data(client, reg);
76 }
77
ths8200_write(struct v4l2_subdev * sd,u8 reg,u8 val)78 static int ths8200_write(struct v4l2_subdev *sd, u8 reg, u8 val)
79 {
80 struct i2c_client *client = v4l2_get_subdevdata(sd);
81 int ret;
82 int i;
83
84 for (i = 0; i < 3; i++) {
85 ret = i2c_smbus_write_byte_data(client, reg, val);
86 if (ret == 0)
87 return 0;
88 }
89 v4l2_err(sd, "I2C Write Problem\n");
90 return ret;
91 }
92
93 /* To set specific bits in the register, a clear-mask is given (to be AND-ed),
94 * and then the value-mask (to be OR-ed).
95 */
96 static inline void
ths8200_write_and_or(struct v4l2_subdev * sd,u8 reg,uint8_t clr_mask,uint8_t val_mask)97 ths8200_write_and_or(struct v4l2_subdev *sd, u8 reg,
98 uint8_t clr_mask, uint8_t val_mask)
99 {
100 ths8200_write(sd, reg, (ths8200_read(sd, reg) & clr_mask) | val_mask);
101 }
102
103 #ifdef CONFIG_VIDEO_ADV_DEBUG
104
ths8200_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)105 static int ths8200_g_register(struct v4l2_subdev *sd,
106 struct v4l2_dbg_register *reg)
107 {
108 reg->val = ths8200_read(sd, reg->reg & 0xff);
109 reg->size = 1;
110
111 return 0;
112 }
113
ths8200_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)114 static int ths8200_s_register(struct v4l2_subdev *sd,
115 const struct v4l2_dbg_register *reg)
116 {
117 ths8200_write(sd, reg->reg & 0xff, reg->val & 0xff);
118
119 return 0;
120 }
121 #endif
122
ths8200_log_status(struct v4l2_subdev * sd)123 static int ths8200_log_status(struct v4l2_subdev *sd)
124 {
125 struct ths8200_state *state = to_state(sd);
126 uint8_t reg_03 = ths8200_read(sd, THS8200_CHIP_CTL);
127
128 v4l2_info(sd, "----- Chip status -----\n");
129 v4l2_info(sd, "version: %u\n", state->chip_version);
130 v4l2_info(sd, "power: %s\n", (reg_03 & 0x0c) ? "off" : "on");
131 v4l2_info(sd, "reset: %s\n", (reg_03 & 0x01) ? "off" : "on");
132 v4l2_info(sd, "test pattern: %s\n",
133 (reg_03 & 0x20) ? "enabled" : "disabled");
134 v4l2_info(sd, "format: %ux%u\n",
135 ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_MSB) * 256 +
136 ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_LSB),
137 (ths8200_read(sd, THS8200_DTG2_LINE_CNT_MSB) & 0x07) * 256 +
138 ths8200_read(sd, THS8200_DTG2_LINE_CNT_LSB));
139 v4l2_print_dv_timings(sd->name, "Configured format:",
140 &state->dv_timings, true);
141 return 0;
142 }
143
144 /* Power up/down ths8200 */
ths8200_s_power(struct v4l2_subdev * sd,int on)145 static int ths8200_s_power(struct v4l2_subdev *sd, int on)
146 {
147 struct ths8200_state *state = to_state(sd);
148
149 v4l2_dbg(1, debug, sd, "%s: power %s\n", __func__, on ? "on" : "off");
150
151 state->power_on = on;
152
153 /* Power up/down - leave in reset state until input video is present */
154 ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xf2, (on ? 0x00 : 0x0c));
155
156 return 0;
157 }
158
159 static const struct v4l2_subdev_core_ops ths8200_core_ops = {
160 .log_status = ths8200_log_status,
161 .s_power = ths8200_s_power,
162 #ifdef CONFIG_VIDEO_ADV_DEBUG
163 .g_register = ths8200_g_register,
164 .s_register = ths8200_s_register,
165 #endif
166 };
167
168 /* -----------------------------------------------------------------------------
169 * V4L2 subdev video operations
170 */
171
ths8200_s_stream(struct v4l2_subdev * sd,int enable)172 static int ths8200_s_stream(struct v4l2_subdev *sd, int enable)
173 {
174 struct ths8200_state *state = to_state(sd);
175
176 if (enable && !state->power_on)
177 ths8200_s_power(sd, true);
178
179 ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xfe,
180 (enable ? 0x01 : 0x00));
181
182 v4l2_dbg(1, debug, sd, "%s: %sable\n",
183 __func__, (enable ? "en" : "dis"));
184
185 return 0;
186 }
187
ths8200_core_init(struct v4l2_subdev * sd)188 static void ths8200_core_init(struct v4l2_subdev *sd)
189 {
190 /* setup clocks */
191 ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0x3f, 0xc0);
192
193 /**** Data path control (DATA) ****/
194 /* Set FSADJ 700 mV,
195 * bypass 422-444 interpolation,
196 * input format 30 bit RGB444
197 */
198 ths8200_write(sd, THS8200_DATA_CNTL, 0x70);
199
200 /* DTG Mode (Video blocked during blanking
201 * VESA slave
202 */
203 ths8200_write(sd, THS8200_DTG1_MODE, 0x87);
204
205 /**** Display Timing Generator Control, Part 1 (DTG1). ****/
206
207 /* Disable embedded syncs on the output by setting
208 * the amplitude to zero for all channels.
209 */
210 ths8200_write(sd, THS8200_DTG1_Y_SYNC_MSB, 0x00);
211 ths8200_write(sd, THS8200_DTG1_CBCR_SYNC_MSB, 0x00);
212 }
213
ths8200_setup(struct v4l2_subdev * sd,struct v4l2_bt_timings * bt)214 static void ths8200_setup(struct v4l2_subdev *sd, struct v4l2_bt_timings *bt)
215 {
216 uint8_t polarity = 0;
217 uint16_t line_start_active_video = (bt->vsync + bt->vbackporch);
218 uint16_t line_start_front_porch = (vtotal(bt) - bt->vfrontporch);
219
220 /*** System ****/
221 /* Set chip in reset while it is configured */
222 ths8200_s_stream(sd, false);
223
224 /* configure video output timings */
225 ths8200_write(sd, THS8200_DTG1_SPEC_A, bt->hsync);
226 ths8200_write(sd, THS8200_DTG1_SPEC_B, bt->hfrontporch);
227
228 /* Zero for progressive scan formats.*/
229 if (!bt->interlaced)
230 ths8200_write(sd, THS8200_DTG1_SPEC_C, 0x00);
231
232 /* Distance from leading edge of h sync to start of active video.
233 * MSB in 0x2b
234 */
235 ths8200_write(sd, THS8200_DTG1_SPEC_D_LSB,
236 (bt->hbackporch + bt->hsync) & 0xff);
237 /* Zero for SDTV-mode. MSB in 0x2b */
238 ths8200_write(sd, THS8200_DTG1_SPEC_E_LSB, 0x00);
239 /*
240 * MSB for dtg1_spec(d/e/h). See comment for
241 * corresponding LSB registers.
242 */
243 ths8200_write(sd, THS8200_DTG1_SPEC_DEH_MSB,
244 ((bt->hbackporch + bt->hsync) & 0x100) >> 1);
245
246 /* h front porch */
247 ths8200_write(sd, THS8200_DTG1_SPEC_K_LSB, (bt->hfrontporch) & 0xff);
248 ths8200_write(sd, THS8200_DTG1_SPEC_K_MSB,
249 ((bt->hfrontporch) & 0x700) >> 8);
250
251 /* Half the line length. Used to calculate SDTV line types. */
252 ths8200_write(sd, THS8200_DTG1_SPEC_G_LSB, (htotal(bt)/2) & 0xff);
253 ths8200_write(sd, THS8200_DTG1_SPEC_G_MSB,
254 ((htotal(bt)/2) >> 8) & 0x0f);
255
256 /* Total pixels per line (ex. 720p: 1650) */
257 ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_MSB, htotal(bt) >> 8);
258 ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_LSB, htotal(bt) & 0xff);
259
260 /* Frame height and field height */
261 /* Field height should be programmed higher than frame_size for
262 * progressive scan formats
263 */
264 ths8200_write(sd, THS8200_DTG1_FRAME_FIELD_SZ_MSB,
265 ((vtotal(bt) >> 4) & 0xf0) + 0x7);
266 ths8200_write(sd, THS8200_DTG1_FRAME_SZ_LSB, vtotal(bt) & 0xff);
267
268 /* Should be programmed higher than frame_size
269 * for progressive formats
270 */
271 if (!bt->interlaced)
272 ths8200_write(sd, THS8200_DTG1_FIELD_SZ_LSB, 0xff);
273
274 /**** Display Timing Generator Control, Part 2 (DTG2). ****/
275 /* Set breakpoint line numbers and types
276 * THS8200 generates line types with different properties. A line type
277 * that sets all the RGB-outputs to zero is used in the blanking areas,
278 * while a line type that enable the RGB-outputs is used in active video
279 * area. The line numbers for start of active video, start of front
280 * porch and after the last line in the frame must be set with the
281 * corresponding line types.
282 *
283 * Line types:
284 * 0x9 - Full normal sync pulse: Blocks data when dtg1_pass is off.
285 * Used in blanking area.
286 * 0x0 - Active video: Video data is always passed. Used in active
287 * video area.
288 */
289 ths8200_write_and_or(sd, THS8200_DTG2_BP1_2_MSB, 0x88,
290 ((line_start_active_video >> 4) & 0x70) +
291 ((line_start_front_porch >> 8) & 0x07));
292 ths8200_write(sd, THS8200_DTG2_BP3_4_MSB, ((vtotal(bt)) >> 4) & 0x70);
293 ths8200_write(sd, THS8200_DTG2_BP1_LSB, line_start_active_video & 0xff);
294 ths8200_write(sd, THS8200_DTG2_BP2_LSB, line_start_front_porch & 0xff);
295 ths8200_write(sd, THS8200_DTG2_BP3_LSB, (vtotal(bt)) & 0xff);
296
297 /* line types */
298 ths8200_write(sd, THS8200_DTG2_LINETYPE1, 0x90);
299 ths8200_write(sd, THS8200_DTG2_LINETYPE2, 0x90);
300
301 /* h sync width transmitted */
302 ths8200_write(sd, THS8200_DTG2_HLENGTH_LSB, bt->hsync & 0xff);
303 ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0x3f,
304 (bt->hsync >> 2) & 0xc0);
305
306 /* The pixel value h sync is asserted on */
307 ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0xe0,
308 (htotal(bt) >> 8) & 0x1f);
309 ths8200_write(sd, THS8200_DTG2_HLENGTH_HDLY_LSB, htotal(bt));
310
311 /* v sync width transmitted (must add 1 to get correct output) */
312 ths8200_write(sd, THS8200_DTG2_VLENGTH1_LSB, (bt->vsync + 1) & 0xff);
313 ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0x3f,
314 ((bt->vsync + 1) >> 2) & 0xc0);
315
316 /* The pixel value v sync is asserted on (must add 1 to get correct output) */
317 ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0xf8,
318 ((vtotal(bt) + 1) >> 8) & 0x7);
319 ths8200_write(sd, THS8200_DTG2_VDLY1_LSB, vtotal(bt) + 1);
320
321 /* For progressive video vlength2 must be set to all 0 and vdly2 must
322 * be set to all 1.
323 */
324 ths8200_write(sd, THS8200_DTG2_VLENGTH2_LSB, 0x00);
325 ths8200_write(sd, THS8200_DTG2_VLENGTH2_MSB_VDLY2_MSB, 0x07);
326 ths8200_write(sd, THS8200_DTG2_VDLY2_LSB, 0xff);
327
328 /* Internal delay factors to synchronize the sync pulses and the data */
329 /* Experimental values delays (hor 0, ver 0) */
330 ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_MSB, 0);
331 ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_LSB, 0);
332 ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_MSB, 0);
333 ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_LSB, 0);
334
335 /* Polarity of received and transmitted sync signals */
336 if (bt->polarities & V4L2_DV_HSYNC_POS_POL) {
337 polarity |= 0x01; /* HS_IN */
338 polarity |= 0x08; /* HS_OUT */
339 }
340 if (bt->polarities & V4L2_DV_VSYNC_POS_POL) {
341 polarity |= 0x02; /* VS_IN */
342 polarity |= 0x10; /* VS_OUT */
343 }
344
345 /* RGB mode, no embedded timings */
346 /* Timing of video input bus is derived from HS, VS, and FID dedicated
347 * inputs
348 */
349 ths8200_write(sd, THS8200_DTG2_CNTL, 0x44 | polarity);
350
351 /* leave reset */
352 ths8200_s_stream(sd, true);
353
354 v4l2_dbg(1, debug, sd, "%s: frame %dx%d, polarity %d\n"
355 "horizontal: front porch %d, back porch %d, sync %d\n"
356 "vertical: sync %d\n", __func__, htotal(bt), vtotal(bt),
357 polarity, bt->hfrontporch, bt->hbackporch,
358 bt->hsync, bt->vsync);
359 }
360
ths8200_s_dv_timings(struct v4l2_subdev * sd,struct v4l2_dv_timings * timings)361 static int ths8200_s_dv_timings(struct v4l2_subdev *sd,
362 struct v4l2_dv_timings *timings)
363 {
364 struct ths8200_state *state = to_state(sd);
365
366 v4l2_dbg(1, debug, sd, "%s:\n", __func__);
367
368 if (!v4l2_valid_dv_timings(timings, &ths8200_timings_cap,
369 NULL, NULL))
370 return -EINVAL;
371
372 if (!v4l2_find_dv_timings_cap(timings, &ths8200_timings_cap, 10,
373 NULL, NULL)) {
374 v4l2_dbg(1, debug, sd, "Unsupported format\n");
375 return -EINVAL;
376 }
377
378 timings->bt.flags &= ~V4L2_DV_FL_REDUCED_FPS;
379
380 /* save timings */
381 state->dv_timings = *timings;
382
383 ths8200_setup(sd, &timings->bt);
384
385 return 0;
386 }
387
ths8200_g_dv_timings(struct v4l2_subdev * sd,struct v4l2_dv_timings * timings)388 static int ths8200_g_dv_timings(struct v4l2_subdev *sd,
389 struct v4l2_dv_timings *timings)
390 {
391 struct ths8200_state *state = to_state(sd);
392
393 v4l2_dbg(1, debug, sd, "%s:\n", __func__);
394
395 *timings = state->dv_timings;
396
397 return 0;
398 }
399
ths8200_enum_dv_timings(struct v4l2_subdev * sd,struct v4l2_enum_dv_timings * timings)400 static int ths8200_enum_dv_timings(struct v4l2_subdev *sd,
401 struct v4l2_enum_dv_timings *timings)
402 {
403 if (timings->pad != 0)
404 return -EINVAL;
405
406 return v4l2_enum_dv_timings_cap(timings, &ths8200_timings_cap,
407 NULL, NULL);
408 }
409
ths8200_dv_timings_cap(struct v4l2_subdev * sd,struct v4l2_dv_timings_cap * cap)410 static int ths8200_dv_timings_cap(struct v4l2_subdev *sd,
411 struct v4l2_dv_timings_cap *cap)
412 {
413 if (cap->pad != 0)
414 return -EINVAL;
415
416 *cap = ths8200_timings_cap;
417 return 0;
418 }
419
420 /* Specific video subsystem operation handlers */
421 static const struct v4l2_subdev_video_ops ths8200_video_ops = {
422 .s_stream = ths8200_s_stream,
423 .s_dv_timings = ths8200_s_dv_timings,
424 .g_dv_timings = ths8200_g_dv_timings,
425 };
426
427 static const struct v4l2_subdev_pad_ops ths8200_pad_ops = {
428 .enum_dv_timings = ths8200_enum_dv_timings,
429 .dv_timings_cap = ths8200_dv_timings_cap,
430 };
431
432 /* V4L2 top level operation handlers */
433 static const struct v4l2_subdev_ops ths8200_ops = {
434 .core = &ths8200_core_ops,
435 .video = &ths8200_video_ops,
436 .pad = &ths8200_pad_ops,
437 };
438
ths8200_probe(struct i2c_client * client)439 static int ths8200_probe(struct i2c_client *client)
440 {
441 struct ths8200_state *state;
442 struct v4l2_subdev *sd;
443 int error;
444
445 /* Check if the adapter supports the needed features */
446 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
447 return -EIO;
448
449 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
450 if (!state)
451 return -ENOMEM;
452
453 sd = &state->sd;
454 v4l2_i2c_subdev_init(sd, client, &ths8200_ops);
455
456 state->chip_version = ths8200_read(sd, THS8200_VERSION);
457 v4l2_dbg(1, debug, sd, "chip version 0x%x\n", state->chip_version);
458
459 ths8200_core_init(sd);
460
461 error = v4l2_async_register_subdev(&state->sd);
462 if (error)
463 return error;
464
465 v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
466 client->addr << 1, client->adapter->name);
467
468 return 0;
469 }
470
ths8200_remove(struct i2c_client * client)471 static void ths8200_remove(struct i2c_client *client)
472 {
473 struct v4l2_subdev *sd = i2c_get_clientdata(client);
474 struct ths8200_state *decoder = to_state(sd);
475
476 v4l2_dbg(1, debug, sd, "%s removed @ 0x%x (%s)\n", client->name,
477 client->addr << 1, client->adapter->name);
478
479 ths8200_s_power(sd, false);
480 v4l2_async_unregister_subdev(&decoder->sd);
481 }
482
483 static const struct i2c_device_id ths8200_id[] = {
484 { "ths8200", 0 },
485 {},
486 };
487 MODULE_DEVICE_TABLE(i2c, ths8200_id);
488
489 #if IS_ENABLED(CONFIG_OF)
490 static const struct of_device_id ths8200_of_match[] = {
491 { .compatible = "ti,ths8200", },
492 { /* sentinel */ },
493 };
494 MODULE_DEVICE_TABLE(of, ths8200_of_match);
495 #endif
496
497 static struct i2c_driver ths8200_driver = {
498 .driver = {
499 .name = "ths8200",
500 .of_match_table = of_match_ptr(ths8200_of_match),
501 },
502 .probe = ths8200_probe,
503 .remove = ths8200_remove,
504 .id_table = ths8200_id,
505 };
506
507 module_i2c_driver(ths8200_driver);
508