1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for the OV7251 camera sensor.
4 *
5 * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
6 * Copyright (c) 2017-2018, Linaro Ltd.
7 */
8
9 #include <linux/bitops.h>
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/i2c.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
19 #include <linux/types.h>
20 #include <media/v4l2-ctrls.h>
21 #include <media/v4l2-fwnode.h>
22 #include <media/v4l2-subdev.h>
23
24 #define OV7251_SC_MODE_SELECT 0x0100
25 #define OV7251_SC_MODE_SELECT_SW_STANDBY 0x0
26 #define OV7251_SC_MODE_SELECT_STREAMING 0x1
27
28 #define OV7251_CHIP_ID_HIGH 0x300a
29 #define OV7251_CHIP_ID_HIGH_BYTE 0x77
30 #define OV7251_CHIP_ID_LOW 0x300b
31 #define OV7251_CHIP_ID_LOW_BYTE 0x50
32 #define OV7251_SC_GP_IO_IN1 0x3029
33 #define OV7251_AEC_EXPO_0 0x3500
34 #define OV7251_AEC_EXPO_1 0x3501
35 #define OV7251_AEC_EXPO_2 0x3502
36 #define OV7251_AEC_AGC_ADJ_0 0x350a
37 #define OV7251_AEC_AGC_ADJ_1 0x350b
38 #define OV7251_TIMING_FORMAT1 0x3820
39 #define OV7251_TIMING_FORMAT1_VFLIP BIT(2)
40 #define OV7251_TIMING_FORMAT2 0x3821
41 #define OV7251_TIMING_FORMAT2_MIRROR BIT(2)
42 #define OV7251_PRE_ISP_00 0x5e00
43 #define OV7251_PRE_ISP_00_TEST_PATTERN BIT(7)
44
45 struct reg_value {
46 u16 reg;
47 u8 val;
48 };
49
50 struct ov7251_mode_info {
51 u32 width;
52 u32 height;
53 const struct reg_value *data;
54 u32 data_size;
55 u32 pixel_clock;
56 u32 link_freq;
57 u16 exposure_max;
58 u16 exposure_def;
59 struct v4l2_fract timeperframe;
60 };
61
62 struct ov7251 {
63 struct i2c_client *i2c_client;
64 struct device *dev;
65 struct v4l2_subdev sd;
66 struct media_pad pad;
67 struct v4l2_fwnode_endpoint ep;
68 struct v4l2_mbus_framefmt fmt;
69 struct v4l2_rect crop;
70 struct clk *xclk;
71 u32 xclk_freq;
72
73 struct regulator *io_regulator;
74 struct regulator *core_regulator;
75 struct regulator *analog_regulator;
76
77 const struct ov7251_mode_info *current_mode;
78
79 struct v4l2_ctrl_handler ctrls;
80 struct v4l2_ctrl *pixel_clock;
81 struct v4l2_ctrl *link_freq;
82 struct v4l2_ctrl *exposure;
83 struct v4l2_ctrl *gain;
84
85 /* Cached register values */
86 u8 aec_pk_manual;
87 u8 pre_isp_00;
88 u8 timing_format1;
89 u8 timing_format2;
90
91 struct mutex lock; /* lock to protect power state, ctrls and mode */
92 bool power_on;
93
94 struct gpio_desc *enable_gpio;
95 };
96
to_ov7251(struct v4l2_subdev * sd)97 static inline struct ov7251 *to_ov7251(struct v4l2_subdev *sd)
98 {
99 return container_of(sd, struct ov7251, sd);
100 }
101
102 static const struct reg_value ov7251_global_init_setting[] = {
103 { 0x0103, 0x01 },
104 { 0x303b, 0x02 },
105 };
106
107 static const struct reg_value ov7251_setting_vga_30fps[] = {
108 { 0x3005, 0x00 },
109 { 0x3012, 0xc0 },
110 { 0x3013, 0xd2 },
111 { 0x3014, 0x04 },
112 { 0x3016, 0xf0 },
113 { 0x3017, 0xf0 },
114 { 0x3018, 0xf0 },
115 { 0x301a, 0xf0 },
116 { 0x301b, 0xf0 },
117 { 0x301c, 0xf0 },
118 { 0x3023, 0x05 },
119 { 0x3037, 0xf0 },
120 { 0x3098, 0x04 }, /* pll2 pre divider */
121 { 0x3099, 0x28 }, /* pll2 multiplier */
122 { 0x309a, 0x05 }, /* pll2 sys divider */
123 { 0x309b, 0x04 }, /* pll2 adc divider */
124 { 0x309d, 0x00 }, /* pll2 divider */
125 { 0x30b0, 0x0a }, /* pll1 pix divider */
126 { 0x30b1, 0x01 }, /* pll1 divider */
127 { 0x30b3, 0x64 }, /* pll1 multiplier */
128 { 0x30b4, 0x03 }, /* pll1 pre divider */
129 { 0x30b5, 0x05 }, /* pll1 mipi divider */
130 { 0x3106, 0xda },
131 { 0x3503, 0x07 },
132 { 0x3509, 0x10 },
133 { 0x3600, 0x1c },
134 { 0x3602, 0x62 },
135 { 0x3620, 0xb7 },
136 { 0x3622, 0x04 },
137 { 0x3626, 0x21 },
138 { 0x3627, 0x30 },
139 { 0x3630, 0x44 },
140 { 0x3631, 0x35 },
141 { 0x3634, 0x60 },
142 { 0x3636, 0x00 },
143 { 0x3662, 0x01 },
144 { 0x3663, 0x70 },
145 { 0x3664, 0x50 },
146 { 0x3666, 0x0a },
147 { 0x3669, 0x1a },
148 { 0x366a, 0x00 },
149 { 0x366b, 0x50 },
150 { 0x3673, 0x01 },
151 { 0x3674, 0xff },
152 { 0x3675, 0x03 },
153 { 0x3705, 0xc1 },
154 { 0x3709, 0x40 },
155 { 0x373c, 0x08 },
156 { 0x3742, 0x00 },
157 { 0x3757, 0xb3 },
158 { 0x3788, 0x00 },
159 { 0x37a8, 0x01 },
160 { 0x37a9, 0xc0 },
161 { 0x3800, 0x00 },
162 { 0x3801, 0x04 },
163 { 0x3802, 0x00 },
164 { 0x3803, 0x04 },
165 { 0x3804, 0x02 },
166 { 0x3805, 0x8b },
167 { 0x3806, 0x01 },
168 { 0x3807, 0xeb },
169 { 0x3808, 0x02 }, /* width high */
170 { 0x3809, 0x80 }, /* width low */
171 { 0x380a, 0x01 }, /* height high */
172 { 0x380b, 0xe0 }, /* height low */
173 { 0x380c, 0x03 }, /* total horiz timing high */
174 { 0x380d, 0xa0 }, /* total horiz timing low */
175 { 0x380e, 0x06 }, /* total vertical timing high */
176 { 0x380f, 0xbc }, /* total vertical timing low */
177 { 0x3810, 0x00 },
178 { 0x3811, 0x04 },
179 { 0x3812, 0x00 },
180 { 0x3813, 0x05 },
181 { 0x3814, 0x11 },
182 { 0x3815, 0x11 },
183 { 0x3820, 0x40 },
184 { 0x3821, 0x00 },
185 { 0x382f, 0x0e },
186 { 0x3832, 0x00 },
187 { 0x3833, 0x05 },
188 { 0x3834, 0x00 },
189 { 0x3835, 0x0c },
190 { 0x3837, 0x00 },
191 { 0x3b80, 0x00 },
192 { 0x3b81, 0xa5 },
193 { 0x3b82, 0x10 },
194 { 0x3b83, 0x00 },
195 { 0x3b84, 0x08 },
196 { 0x3b85, 0x00 },
197 { 0x3b86, 0x01 },
198 { 0x3b87, 0x00 },
199 { 0x3b88, 0x00 },
200 { 0x3b89, 0x00 },
201 { 0x3b8a, 0x00 },
202 { 0x3b8b, 0x05 },
203 { 0x3b8c, 0x00 },
204 { 0x3b8d, 0x00 },
205 { 0x3b8e, 0x00 },
206 { 0x3b8f, 0x1a },
207 { 0x3b94, 0x05 },
208 { 0x3b95, 0xf2 },
209 { 0x3b96, 0x40 },
210 { 0x3c00, 0x89 },
211 { 0x3c01, 0x63 },
212 { 0x3c02, 0x01 },
213 { 0x3c03, 0x00 },
214 { 0x3c04, 0x00 },
215 { 0x3c05, 0x03 },
216 { 0x3c06, 0x00 },
217 { 0x3c07, 0x06 },
218 { 0x3c0c, 0x01 },
219 { 0x3c0d, 0xd0 },
220 { 0x3c0e, 0x02 },
221 { 0x3c0f, 0x0a },
222 { 0x4001, 0x42 },
223 { 0x4004, 0x04 },
224 { 0x4005, 0x00 },
225 { 0x404e, 0x01 },
226 { 0x4300, 0xff },
227 { 0x4301, 0x00 },
228 { 0x4315, 0x00 },
229 { 0x4501, 0x48 },
230 { 0x4600, 0x00 },
231 { 0x4601, 0x4e },
232 { 0x4801, 0x0f },
233 { 0x4806, 0x0f },
234 { 0x4819, 0xaa },
235 { 0x4823, 0x3e },
236 { 0x4837, 0x19 },
237 { 0x4a0d, 0x00 },
238 { 0x4a47, 0x7f },
239 { 0x4a49, 0xf0 },
240 { 0x4a4b, 0x30 },
241 { 0x5000, 0x85 },
242 { 0x5001, 0x80 },
243 };
244
245 static const struct reg_value ov7251_setting_vga_60fps[] = {
246 { 0x3005, 0x00 },
247 { 0x3012, 0xc0 },
248 { 0x3013, 0xd2 },
249 { 0x3014, 0x04 },
250 { 0x3016, 0x10 },
251 { 0x3017, 0x00 },
252 { 0x3018, 0x00 },
253 { 0x301a, 0x00 },
254 { 0x301b, 0x00 },
255 { 0x301c, 0x00 },
256 { 0x3023, 0x05 },
257 { 0x3037, 0xf0 },
258 { 0x3098, 0x04 }, /* pll2 pre divider */
259 { 0x3099, 0x28 }, /* pll2 multiplier */
260 { 0x309a, 0x05 }, /* pll2 sys divider */
261 { 0x309b, 0x04 }, /* pll2 adc divider */
262 { 0x309d, 0x00 }, /* pll2 divider */
263 { 0x30b0, 0x0a }, /* pll1 pix divider */
264 { 0x30b1, 0x01 }, /* pll1 divider */
265 { 0x30b3, 0x64 }, /* pll1 multiplier */
266 { 0x30b4, 0x03 }, /* pll1 pre divider */
267 { 0x30b5, 0x05 }, /* pll1 mipi divider */
268 { 0x3106, 0xda },
269 { 0x3503, 0x07 },
270 { 0x3509, 0x10 },
271 { 0x3600, 0x1c },
272 { 0x3602, 0x62 },
273 { 0x3620, 0xb7 },
274 { 0x3622, 0x04 },
275 { 0x3626, 0x21 },
276 { 0x3627, 0x30 },
277 { 0x3630, 0x44 },
278 { 0x3631, 0x35 },
279 { 0x3634, 0x60 },
280 { 0x3636, 0x00 },
281 { 0x3662, 0x01 },
282 { 0x3663, 0x70 },
283 { 0x3664, 0x50 },
284 { 0x3666, 0x0a },
285 { 0x3669, 0x1a },
286 { 0x366a, 0x00 },
287 { 0x366b, 0x50 },
288 { 0x3673, 0x01 },
289 { 0x3674, 0xff },
290 { 0x3675, 0x03 },
291 { 0x3705, 0xc1 },
292 { 0x3709, 0x40 },
293 { 0x373c, 0x08 },
294 { 0x3742, 0x00 },
295 { 0x3757, 0xb3 },
296 { 0x3788, 0x00 },
297 { 0x37a8, 0x01 },
298 { 0x37a9, 0xc0 },
299 { 0x3800, 0x00 },
300 { 0x3801, 0x04 },
301 { 0x3802, 0x00 },
302 { 0x3803, 0x04 },
303 { 0x3804, 0x02 },
304 { 0x3805, 0x8b },
305 { 0x3806, 0x01 },
306 { 0x3807, 0xeb },
307 { 0x3808, 0x02 }, /* width high */
308 { 0x3809, 0x80 }, /* width low */
309 { 0x380a, 0x01 }, /* height high */
310 { 0x380b, 0xe0 }, /* height low */
311 { 0x380c, 0x03 }, /* total horiz timing high */
312 { 0x380d, 0xa0 }, /* total horiz timing low */
313 { 0x380e, 0x03 }, /* total vertical timing high */
314 { 0x380f, 0x5c }, /* total vertical timing low */
315 { 0x3810, 0x00 },
316 { 0x3811, 0x04 },
317 { 0x3812, 0x00 },
318 { 0x3813, 0x05 },
319 { 0x3814, 0x11 },
320 { 0x3815, 0x11 },
321 { 0x3820, 0x40 },
322 { 0x3821, 0x00 },
323 { 0x382f, 0x0e },
324 { 0x3832, 0x00 },
325 { 0x3833, 0x05 },
326 { 0x3834, 0x00 },
327 { 0x3835, 0x0c },
328 { 0x3837, 0x00 },
329 { 0x3b80, 0x00 },
330 { 0x3b81, 0xa5 },
331 { 0x3b82, 0x10 },
332 { 0x3b83, 0x00 },
333 { 0x3b84, 0x08 },
334 { 0x3b85, 0x00 },
335 { 0x3b86, 0x01 },
336 { 0x3b87, 0x00 },
337 { 0x3b88, 0x00 },
338 { 0x3b89, 0x00 },
339 { 0x3b8a, 0x00 },
340 { 0x3b8b, 0x05 },
341 { 0x3b8c, 0x00 },
342 { 0x3b8d, 0x00 },
343 { 0x3b8e, 0x00 },
344 { 0x3b8f, 0x1a },
345 { 0x3b94, 0x05 },
346 { 0x3b95, 0xf2 },
347 { 0x3b96, 0x40 },
348 { 0x3c00, 0x89 },
349 { 0x3c01, 0x63 },
350 { 0x3c02, 0x01 },
351 { 0x3c03, 0x00 },
352 { 0x3c04, 0x00 },
353 { 0x3c05, 0x03 },
354 { 0x3c06, 0x00 },
355 { 0x3c07, 0x06 },
356 { 0x3c0c, 0x01 },
357 { 0x3c0d, 0xd0 },
358 { 0x3c0e, 0x02 },
359 { 0x3c0f, 0x0a },
360 { 0x4001, 0x42 },
361 { 0x4004, 0x04 },
362 { 0x4005, 0x00 },
363 { 0x404e, 0x01 },
364 { 0x4300, 0xff },
365 { 0x4301, 0x00 },
366 { 0x4315, 0x00 },
367 { 0x4501, 0x48 },
368 { 0x4600, 0x00 },
369 { 0x4601, 0x4e },
370 { 0x4801, 0x0f },
371 { 0x4806, 0x0f },
372 { 0x4819, 0xaa },
373 { 0x4823, 0x3e },
374 { 0x4837, 0x19 },
375 { 0x4a0d, 0x00 },
376 { 0x4a47, 0x7f },
377 { 0x4a49, 0xf0 },
378 { 0x4a4b, 0x30 },
379 { 0x5000, 0x85 },
380 { 0x5001, 0x80 },
381 };
382
383 static const struct reg_value ov7251_setting_vga_90fps[] = {
384 { 0x3005, 0x00 },
385 { 0x3012, 0xc0 },
386 { 0x3013, 0xd2 },
387 { 0x3014, 0x04 },
388 { 0x3016, 0x10 },
389 { 0x3017, 0x00 },
390 { 0x3018, 0x00 },
391 { 0x301a, 0x00 },
392 { 0x301b, 0x00 },
393 { 0x301c, 0x00 },
394 { 0x3023, 0x05 },
395 { 0x3037, 0xf0 },
396 { 0x3098, 0x04 }, /* pll2 pre divider */
397 { 0x3099, 0x28 }, /* pll2 multiplier */
398 { 0x309a, 0x05 }, /* pll2 sys divider */
399 { 0x309b, 0x04 }, /* pll2 adc divider */
400 { 0x309d, 0x00 }, /* pll2 divider */
401 { 0x30b0, 0x0a }, /* pll1 pix divider */
402 { 0x30b1, 0x01 }, /* pll1 divider */
403 { 0x30b3, 0x64 }, /* pll1 multiplier */
404 { 0x30b4, 0x03 }, /* pll1 pre divider */
405 { 0x30b5, 0x05 }, /* pll1 mipi divider */
406 { 0x3106, 0xda },
407 { 0x3503, 0x07 },
408 { 0x3509, 0x10 },
409 { 0x3600, 0x1c },
410 { 0x3602, 0x62 },
411 { 0x3620, 0xb7 },
412 { 0x3622, 0x04 },
413 { 0x3626, 0x21 },
414 { 0x3627, 0x30 },
415 { 0x3630, 0x44 },
416 { 0x3631, 0x35 },
417 { 0x3634, 0x60 },
418 { 0x3636, 0x00 },
419 { 0x3662, 0x01 },
420 { 0x3663, 0x70 },
421 { 0x3664, 0x50 },
422 { 0x3666, 0x0a },
423 { 0x3669, 0x1a },
424 { 0x366a, 0x00 },
425 { 0x366b, 0x50 },
426 { 0x3673, 0x01 },
427 { 0x3674, 0xff },
428 { 0x3675, 0x03 },
429 { 0x3705, 0xc1 },
430 { 0x3709, 0x40 },
431 { 0x373c, 0x08 },
432 { 0x3742, 0x00 },
433 { 0x3757, 0xb3 },
434 { 0x3788, 0x00 },
435 { 0x37a8, 0x01 },
436 { 0x37a9, 0xc0 },
437 { 0x3800, 0x00 },
438 { 0x3801, 0x04 },
439 { 0x3802, 0x00 },
440 { 0x3803, 0x04 },
441 { 0x3804, 0x02 },
442 { 0x3805, 0x8b },
443 { 0x3806, 0x01 },
444 { 0x3807, 0xeb },
445 { 0x3808, 0x02 }, /* width high */
446 { 0x3809, 0x80 }, /* width low */
447 { 0x380a, 0x01 }, /* height high */
448 { 0x380b, 0xe0 }, /* height low */
449 { 0x380c, 0x03 }, /* total horiz timing high */
450 { 0x380d, 0xa0 }, /* total horiz timing low */
451 { 0x380e, 0x02 }, /* total vertical timing high */
452 { 0x380f, 0x3c }, /* total vertical timing low */
453 { 0x3810, 0x00 },
454 { 0x3811, 0x04 },
455 { 0x3812, 0x00 },
456 { 0x3813, 0x05 },
457 { 0x3814, 0x11 },
458 { 0x3815, 0x11 },
459 { 0x3820, 0x40 },
460 { 0x3821, 0x00 },
461 { 0x382f, 0x0e },
462 { 0x3832, 0x00 },
463 { 0x3833, 0x05 },
464 { 0x3834, 0x00 },
465 { 0x3835, 0x0c },
466 { 0x3837, 0x00 },
467 { 0x3b80, 0x00 },
468 { 0x3b81, 0xa5 },
469 { 0x3b82, 0x10 },
470 { 0x3b83, 0x00 },
471 { 0x3b84, 0x08 },
472 { 0x3b85, 0x00 },
473 { 0x3b86, 0x01 },
474 { 0x3b87, 0x00 },
475 { 0x3b88, 0x00 },
476 { 0x3b89, 0x00 },
477 { 0x3b8a, 0x00 },
478 { 0x3b8b, 0x05 },
479 { 0x3b8c, 0x00 },
480 { 0x3b8d, 0x00 },
481 { 0x3b8e, 0x00 },
482 { 0x3b8f, 0x1a },
483 { 0x3b94, 0x05 },
484 { 0x3b95, 0xf2 },
485 { 0x3b96, 0x40 },
486 { 0x3c00, 0x89 },
487 { 0x3c01, 0x63 },
488 { 0x3c02, 0x01 },
489 { 0x3c03, 0x00 },
490 { 0x3c04, 0x00 },
491 { 0x3c05, 0x03 },
492 { 0x3c06, 0x00 },
493 { 0x3c07, 0x06 },
494 { 0x3c0c, 0x01 },
495 { 0x3c0d, 0xd0 },
496 { 0x3c0e, 0x02 },
497 { 0x3c0f, 0x0a },
498 { 0x4001, 0x42 },
499 { 0x4004, 0x04 },
500 { 0x4005, 0x00 },
501 { 0x404e, 0x01 },
502 { 0x4300, 0xff },
503 { 0x4301, 0x00 },
504 { 0x4315, 0x00 },
505 { 0x4501, 0x48 },
506 { 0x4600, 0x00 },
507 { 0x4601, 0x4e },
508 { 0x4801, 0x0f },
509 { 0x4806, 0x0f },
510 { 0x4819, 0xaa },
511 { 0x4823, 0x3e },
512 { 0x4837, 0x19 },
513 { 0x4a0d, 0x00 },
514 { 0x4a47, 0x7f },
515 { 0x4a49, 0xf0 },
516 { 0x4a4b, 0x30 },
517 { 0x5000, 0x85 },
518 { 0x5001, 0x80 },
519 };
520
521 static const s64 link_freq[] = {
522 240000000,
523 };
524
525 static const struct ov7251_mode_info ov7251_mode_info_data[] = {
526 {
527 .width = 640,
528 .height = 480,
529 .data = ov7251_setting_vga_30fps,
530 .data_size = ARRAY_SIZE(ov7251_setting_vga_30fps),
531 .pixel_clock = 48000000,
532 .link_freq = 0, /* an index in link_freq[] */
533 .exposure_max = 1704,
534 .exposure_def = 504,
535 .timeperframe = {
536 .numerator = 100,
537 .denominator = 3000
538 }
539 },
540 {
541 .width = 640,
542 .height = 480,
543 .data = ov7251_setting_vga_60fps,
544 .data_size = ARRAY_SIZE(ov7251_setting_vga_60fps),
545 .pixel_clock = 48000000,
546 .link_freq = 0, /* an index in link_freq[] */
547 .exposure_max = 840,
548 .exposure_def = 504,
549 .timeperframe = {
550 .numerator = 100,
551 .denominator = 6014
552 }
553 },
554 {
555 .width = 640,
556 .height = 480,
557 .data = ov7251_setting_vga_90fps,
558 .data_size = ARRAY_SIZE(ov7251_setting_vga_90fps),
559 .pixel_clock = 48000000,
560 .link_freq = 0, /* an index in link_freq[] */
561 .exposure_max = 552,
562 .exposure_def = 504,
563 .timeperframe = {
564 .numerator = 100,
565 .denominator = 9043
566 }
567 },
568 };
569
ov7251_regulators_enable(struct ov7251 * ov7251)570 static int ov7251_regulators_enable(struct ov7251 *ov7251)
571 {
572 int ret;
573
574 /* OV7251 power up sequence requires core regulator
575 * to be enabled not earlier than io regulator
576 */
577
578 ret = regulator_enable(ov7251->io_regulator);
579 if (ret < 0) {
580 dev_err(ov7251->dev, "set io voltage failed\n");
581 return ret;
582 }
583
584 ret = regulator_enable(ov7251->analog_regulator);
585 if (ret) {
586 dev_err(ov7251->dev, "set analog voltage failed\n");
587 goto err_disable_io;
588 }
589
590 ret = regulator_enable(ov7251->core_regulator);
591 if (ret) {
592 dev_err(ov7251->dev, "set core voltage failed\n");
593 goto err_disable_analog;
594 }
595
596 return 0;
597
598 err_disable_analog:
599 regulator_disable(ov7251->analog_regulator);
600
601 err_disable_io:
602 regulator_disable(ov7251->io_regulator);
603
604 return ret;
605 }
606
ov7251_regulators_disable(struct ov7251 * ov7251)607 static void ov7251_regulators_disable(struct ov7251 *ov7251)
608 {
609 int ret;
610
611 ret = regulator_disable(ov7251->core_regulator);
612 if (ret < 0)
613 dev_err(ov7251->dev, "core regulator disable failed\n");
614
615 ret = regulator_disable(ov7251->analog_regulator);
616 if (ret < 0)
617 dev_err(ov7251->dev, "analog regulator disable failed\n");
618
619 ret = regulator_disable(ov7251->io_regulator);
620 if (ret < 0)
621 dev_err(ov7251->dev, "io regulator disable failed\n");
622 }
623
ov7251_write_reg(struct ov7251 * ov7251,u16 reg,u8 val)624 static int ov7251_write_reg(struct ov7251 *ov7251, u16 reg, u8 val)
625 {
626 u8 regbuf[3];
627 int ret;
628
629 regbuf[0] = reg >> 8;
630 regbuf[1] = reg & 0xff;
631 regbuf[2] = val;
632
633 ret = i2c_master_send(ov7251->i2c_client, regbuf, 3);
634 if (ret < 0) {
635 dev_err(ov7251->dev, "%s: write reg error %d: reg=%x, val=%x\n",
636 __func__, ret, reg, val);
637 return ret;
638 }
639
640 return 0;
641 }
642
ov7251_write_seq_regs(struct ov7251 * ov7251,u16 reg,u8 * val,u8 num)643 static int ov7251_write_seq_regs(struct ov7251 *ov7251, u16 reg, u8 *val,
644 u8 num)
645 {
646 u8 regbuf[5];
647 u8 nregbuf = sizeof(reg) + num * sizeof(*val);
648 int ret = 0;
649
650 if (nregbuf > sizeof(regbuf))
651 return -EINVAL;
652
653 regbuf[0] = reg >> 8;
654 regbuf[1] = reg & 0xff;
655
656 memcpy(regbuf + 2, val, num);
657
658 ret = i2c_master_send(ov7251->i2c_client, regbuf, nregbuf);
659 if (ret < 0) {
660 dev_err(ov7251->dev,
661 "%s: write seq regs error %d: first reg=%x\n",
662 __func__, ret, reg);
663 return ret;
664 }
665
666 return 0;
667 }
668
ov7251_read_reg(struct ov7251 * ov7251,u16 reg,u8 * val)669 static int ov7251_read_reg(struct ov7251 *ov7251, u16 reg, u8 *val)
670 {
671 u8 regbuf[2];
672 int ret;
673
674 regbuf[0] = reg >> 8;
675 regbuf[1] = reg & 0xff;
676
677 ret = i2c_master_send(ov7251->i2c_client, regbuf, 2);
678 if (ret < 0) {
679 dev_err(ov7251->dev, "%s: write reg error %d: reg=%x\n",
680 __func__, ret, reg);
681 return ret;
682 }
683
684 ret = i2c_master_recv(ov7251->i2c_client, val, 1);
685 if (ret < 0) {
686 dev_err(ov7251->dev, "%s: read reg error %d: reg=%x\n",
687 __func__, ret, reg);
688 return ret;
689 }
690
691 return 0;
692 }
693
ov7251_set_exposure(struct ov7251 * ov7251,s32 exposure)694 static int ov7251_set_exposure(struct ov7251 *ov7251, s32 exposure)
695 {
696 u16 reg;
697 u8 val[3];
698
699 reg = OV7251_AEC_EXPO_0;
700 val[0] = (exposure & 0xf000) >> 12; /* goes to OV7251_AEC_EXPO_0 */
701 val[1] = (exposure & 0x0ff0) >> 4; /* goes to OV7251_AEC_EXPO_1 */
702 val[2] = (exposure & 0x000f) << 4; /* goes to OV7251_AEC_EXPO_2 */
703
704 return ov7251_write_seq_regs(ov7251, reg, val, 3);
705 }
706
ov7251_set_gain(struct ov7251 * ov7251,s32 gain)707 static int ov7251_set_gain(struct ov7251 *ov7251, s32 gain)
708 {
709 u16 reg;
710 u8 val[2];
711
712 reg = OV7251_AEC_AGC_ADJ_0;
713 val[0] = (gain & 0x0300) >> 8; /* goes to OV7251_AEC_AGC_ADJ_0 */
714 val[1] = gain & 0xff; /* goes to OV7251_AEC_AGC_ADJ_1 */
715
716 return ov7251_write_seq_regs(ov7251, reg, val, 2);
717 }
718
ov7251_set_register_array(struct ov7251 * ov7251,const struct reg_value * settings,unsigned int num_settings)719 static int ov7251_set_register_array(struct ov7251 *ov7251,
720 const struct reg_value *settings,
721 unsigned int num_settings)
722 {
723 unsigned int i;
724 int ret;
725
726 for (i = 0; i < num_settings; ++i, ++settings) {
727 ret = ov7251_write_reg(ov7251, settings->reg, settings->val);
728 if (ret < 0)
729 return ret;
730 }
731
732 return 0;
733 }
734
ov7251_set_power_on(struct ov7251 * ov7251)735 static int ov7251_set_power_on(struct ov7251 *ov7251)
736 {
737 int ret;
738 u32 wait_us;
739
740 ret = ov7251_regulators_enable(ov7251);
741 if (ret < 0)
742 return ret;
743
744 ret = clk_prepare_enable(ov7251->xclk);
745 if (ret < 0) {
746 dev_err(ov7251->dev, "clk prepare enable failed\n");
747 ov7251_regulators_disable(ov7251);
748 return ret;
749 }
750
751 gpiod_set_value_cansleep(ov7251->enable_gpio, 1);
752
753 /* wait at least 65536 external clock cycles */
754 wait_us = DIV_ROUND_UP(65536 * 1000,
755 DIV_ROUND_UP(ov7251->xclk_freq, 1000));
756 usleep_range(wait_us, wait_us + 1000);
757
758 return 0;
759 }
760
ov7251_set_power_off(struct ov7251 * ov7251)761 static void ov7251_set_power_off(struct ov7251 *ov7251)
762 {
763 clk_disable_unprepare(ov7251->xclk);
764 gpiod_set_value_cansleep(ov7251->enable_gpio, 0);
765 ov7251_regulators_disable(ov7251);
766 }
767
ov7251_s_power(struct v4l2_subdev * sd,int on)768 static int ov7251_s_power(struct v4l2_subdev *sd, int on)
769 {
770 struct ov7251 *ov7251 = to_ov7251(sd);
771 int ret = 0;
772
773 mutex_lock(&ov7251->lock);
774
775 /* If the power state is not modified - no work to do. */
776 if (ov7251->power_on == !!on)
777 goto exit;
778
779 if (on) {
780 ret = ov7251_set_power_on(ov7251);
781 if (ret < 0)
782 goto exit;
783
784 ret = ov7251_set_register_array(ov7251,
785 ov7251_global_init_setting,
786 ARRAY_SIZE(ov7251_global_init_setting));
787 if (ret < 0) {
788 dev_err(ov7251->dev, "could not set init registers\n");
789 ov7251_set_power_off(ov7251);
790 goto exit;
791 }
792
793 ov7251->power_on = true;
794 } else {
795 ov7251_set_power_off(ov7251);
796 ov7251->power_on = false;
797 }
798
799 exit:
800 mutex_unlock(&ov7251->lock);
801
802 return ret;
803 }
804
ov7251_set_hflip(struct ov7251 * ov7251,s32 value)805 static int ov7251_set_hflip(struct ov7251 *ov7251, s32 value)
806 {
807 u8 val = ov7251->timing_format2;
808 int ret;
809
810 if (value)
811 val |= OV7251_TIMING_FORMAT2_MIRROR;
812 else
813 val &= ~OV7251_TIMING_FORMAT2_MIRROR;
814
815 ret = ov7251_write_reg(ov7251, OV7251_TIMING_FORMAT2, val);
816 if (!ret)
817 ov7251->timing_format2 = val;
818
819 return ret;
820 }
821
ov7251_set_vflip(struct ov7251 * ov7251,s32 value)822 static int ov7251_set_vflip(struct ov7251 *ov7251, s32 value)
823 {
824 u8 val = ov7251->timing_format1;
825 int ret;
826
827 if (value)
828 val |= OV7251_TIMING_FORMAT1_VFLIP;
829 else
830 val &= ~OV7251_TIMING_FORMAT1_VFLIP;
831
832 ret = ov7251_write_reg(ov7251, OV7251_TIMING_FORMAT1, val);
833 if (!ret)
834 ov7251->timing_format1 = val;
835
836 return ret;
837 }
838
ov7251_set_test_pattern(struct ov7251 * ov7251,s32 value)839 static int ov7251_set_test_pattern(struct ov7251 *ov7251, s32 value)
840 {
841 u8 val = ov7251->pre_isp_00;
842 int ret;
843
844 if (value)
845 val |= OV7251_PRE_ISP_00_TEST_PATTERN;
846 else
847 val &= ~OV7251_PRE_ISP_00_TEST_PATTERN;
848
849 ret = ov7251_write_reg(ov7251, OV7251_PRE_ISP_00, val);
850 if (!ret)
851 ov7251->pre_isp_00 = val;
852
853 return ret;
854 }
855
856 static const char * const ov7251_test_pattern_menu[] = {
857 "Disabled",
858 "Vertical Pattern Bars",
859 };
860
ov7251_s_ctrl(struct v4l2_ctrl * ctrl)861 static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
862 {
863 struct ov7251 *ov7251 = container_of(ctrl->handler,
864 struct ov7251, ctrls);
865 int ret;
866
867 /* v4l2_ctrl_lock() locks our mutex */
868
869 if (!ov7251->power_on)
870 return 0;
871
872 switch (ctrl->id) {
873 case V4L2_CID_EXPOSURE:
874 ret = ov7251_set_exposure(ov7251, ctrl->val);
875 break;
876 case V4L2_CID_GAIN:
877 ret = ov7251_set_gain(ov7251, ctrl->val);
878 break;
879 case V4L2_CID_TEST_PATTERN:
880 ret = ov7251_set_test_pattern(ov7251, ctrl->val);
881 break;
882 case V4L2_CID_HFLIP:
883 ret = ov7251_set_hflip(ov7251, ctrl->val);
884 break;
885 case V4L2_CID_VFLIP:
886 ret = ov7251_set_vflip(ov7251, ctrl->val);
887 break;
888 default:
889 ret = -EINVAL;
890 break;
891 }
892
893 return ret;
894 }
895
896 static const struct v4l2_ctrl_ops ov7251_ctrl_ops = {
897 .s_ctrl = ov7251_s_ctrl,
898 };
899
ov7251_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)900 static int ov7251_enum_mbus_code(struct v4l2_subdev *sd,
901 struct v4l2_subdev_pad_config *cfg,
902 struct v4l2_subdev_mbus_code_enum *code)
903 {
904 if (code->index > 0)
905 return -EINVAL;
906
907 code->code = MEDIA_BUS_FMT_Y10_1X10;
908
909 return 0;
910 }
911
ov7251_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)912 static int ov7251_enum_frame_size(struct v4l2_subdev *subdev,
913 struct v4l2_subdev_pad_config *cfg,
914 struct v4l2_subdev_frame_size_enum *fse)
915 {
916 if (fse->code != MEDIA_BUS_FMT_Y10_1X10)
917 return -EINVAL;
918
919 if (fse->index >= ARRAY_SIZE(ov7251_mode_info_data))
920 return -EINVAL;
921
922 fse->min_width = ov7251_mode_info_data[fse->index].width;
923 fse->max_width = ov7251_mode_info_data[fse->index].width;
924 fse->min_height = ov7251_mode_info_data[fse->index].height;
925 fse->max_height = ov7251_mode_info_data[fse->index].height;
926
927 return 0;
928 }
929
ov7251_enum_frame_ival(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_interval_enum * fie)930 static int ov7251_enum_frame_ival(struct v4l2_subdev *subdev,
931 struct v4l2_subdev_pad_config *cfg,
932 struct v4l2_subdev_frame_interval_enum *fie)
933 {
934 unsigned int index = fie->index;
935 unsigned int i;
936
937 for (i = 0; i < ARRAY_SIZE(ov7251_mode_info_data); i++) {
938 if (fie->width != ov7251_mode_info_data[i].width ||
939 fie->height != ov7251_mode_info_data[i].height)
940 continue;
941
942 if (index-- == 0) {
943 fie->interval = ov7251_mode_info_data[i].timeperframe;
944 return 0;
945 }
946 }
947
948 return -EINVAL;
949 }
950
951 static struct v4l2_mbus_framefmt *
__ov7251_get_pad_format(struct ov7251 * ov7251,struct v4l2_subdev_pad_config * cfg,unsigned int pad,enum v4l2_subdev_format_whence which)952 __ov7251_get_pad_format(struct ov7251 *ov7251,
953 struct v4l2_subdev_pad_config *cfg,
954 unsigned int pad,
955 enum v4l2_subdev_format_whence which)
956 {
957 switch (which) {
958 case V4L2_SUBDEV_FORMAT_TRY:
959 return v4l2_subdev_get_try_format(&ov7251->sd, cfg, pad);
960 case V4L2_SUBDEV_FORMAT_ACTIVE:
961 return &ov7251->fmt;
962 default:
963 return NULL;
964 }
965 }
966
ov7251_get_format(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)967 static int ov7251_get_format(struct v4l2_subdev *sd,
968 struct v4l2_subdev_pad_config *cfg,
969 struct v4l2_subdev_format *format)
970 {
971 struct ov7251 *ov7251 = to_ov7251(sd);
972
973 mutex_lock(&ov7251->lock);
974 format->format = *__ov7251_get_pad_format(ov7251, cfg, format->pad,
975 format->which);
976 mutex_unlock(&ov7251->lock);
977
978 return 0;
979 }
980
981 static struct v4l2_rect *
__ov7251_get_pad_crop(struct ov7251 * ov7251,struct v4l2_subdev_pad_config * cfg,unsigned int pad,enum v4l2_subdev_format_whence which)982 __ov7251_get_pad_crop(struct ov7251 *ov7251, struct v4l2_subdev_pad_config *cfg,
983 unsigned int pad, enum v4l2_subdev_format_whence which)
984 {
985 switch (which) {
986 case V4L2_SUBDEV_FORMAT_TRY:
987 return v4l2_subdev_get_try_crop(&ov7251->sd, cfg, pad);
988 case V4L2_SUBDEV_FORMAT_ACTIVE:
989 return &ov7251->crop;
990 default:
991 return NULL;
992 }
993 }
994
avg_fps(const struct v4l2_fract * t)995 static inline u32 avg_fps(const struct v4l2_fract *t)
996 {
997 return (t->denominator + (t->numerator >> 1)) / t->numerator;
998 }
999
1000 static const struct ov7251_mode_info *
ov7251_find_mode_by_ival(struct ov7251 * ov7251,struct v4l2_fract * timeperframe)1001 ov7251_find_mode_by_ival(struct ov7251 *ov7251, struct v4l2_fract *timeperframe)
1002 {
1003 const struct ov7251_mode_info *mode = ov7251->current_mode;
1004 unsigned int fps_req = avg_fps(timeperframe);
1005 unsigned int max_dist_match = (unsigned int) -1;
1006 unsigned int i, n = 0;
1007
1008 for (i = 0; i < ARRAY_SIZE(ov7251_mode_info_data); i++) {
1009 unsigned int dist;
1010 unsigned int fps_tmp;
1011
1012 if (mode->width != ov7251_mode_info_data[i].width ||
1013 mode->height != ov7251_mode_info_data[i].height)
1014 continue;
1015
1016 fps_tmp = avg_fps(&ov7251_mode_info_data[i].timeperframe);
1017
1018 dist = abs(fps_req - fps_tmp);
1019
1020 if (dist < max_dist_match) {
1021 n = i;
1022 max_dist_match = dist;
1023 }
1024 }
1025
1026 return &ov7251_mode_info_data[n];
1027 }
1028
ov7251_set_format(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)1029 static int ov7251_set_format(struct v4l2_subdev *sd,
1030 struct v4l2_subdev_pad_config *cfg,
1031 struct v4l2_subdev_format *format)
1032 {
1033 struct ov7251 *ov7251 = to_ov7251(sd);
1034 struct v4l2_mbus_framefmt *__format;
1035 struct v4l2_rect *__crop;
1036 const struct ov7251_mode_info *new_mode;
1037 int ret = 0;
1038
1039 mutex_lock(&ov7251->lock);
1040
1041 __crop = __ov7251_get_pad_crop(ov7251, cfg, format->pad, format->which);
1042
1043 new_mode = v4l2_find_nearest_size(ov7251_mode_info_data,
1044 ARRAY_SIZE(ov7251_mode_info_data),
1045 width, height,
1046 format->format.width, format->format.height);
1047
1048 __crop->width = new_mode->width;
1049 __crop->height = new_mode->height;
1050
1051 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
1052 ret = __v4l2_ctrl_s_ctrl_int64(ov7251->pixel_clock,
1053 new_mode->pixel_clock);
1054 if (ret < 0)
1055 goto exit;
1056
1057 ret = __v4l2_ctrl_s_ctrl(ov7251->link_freq,
1058 new_mode->link_freq);
1059 if (ret < 0)
1060 goto exit;
1061
1062 ret = __v4l2_ctrl_modify_range(ov7251->exposure,
1063 1, new_mode->exposure_max,
1064 1, new_mode->exposure_def);
1065 if (ret < 0)
1066 goto exit;
1067
1068 ret = __v4l2_ctrl_s_ctrl(ov7251->exposure,
1069 new_mode->exposure_def);
1070 if (ret < 0)
1071 goto exit;
1072
1073 ret = __v4l2_ctrl_s_ctrl(ov7251->gain, 16);
1074 if (ret < 0)
1075 goto exit;
1076
1077 ov7251->current_mode = new_mode;
1078 }
1079
1080 __format = __ov7251_get_pad_format(ov7251, cfg, format->pad,
1081 format->which);
1082 __format->width = __crop->width;
1083 __format->height = __crop->height;
1084 __format->code = MEDIA_BUS_FMT_Y10_1X10;
1085 __format->field = V4L2_FIELD_NONE;
1086 __format->colorspace = V4L2_COLORSPACE_SRGB;
1087 __format->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(__format->colorspace);
1088 __format->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
1089 __format->colorspace, __format->ycbcr_enc);
1090 __format->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(__format->colorspace);
1091
1092 format->format = *__format;
1093
1094 exit:
1095 mutex_unlock(&ov7251->lock);
1096
1097 return ret;
1098 }
1099
ov7251_entity_init_cfg(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg)1100 static int ov7251_entity_init_cfg(struct v4l2_subdev *subdev,
1101 struct v4l2_subdev_pad_config *cfg)
1102 {
1103 struct v4l2_subdev_format fmt = {
1104 .which = cfg ? V4L2_SUBDEV_FORMAT_TRY
1105 : V4L2_SUBDEV_FORMAT_ACTIVE,
1106 .format = {
1107 .width = 640,
1108 .height = 480
1109 }
1110 };
1111
1112 ov7251_set_format(subdev, cfg, &fmt);
1113
1114 return 0;
1115 }
1116
ov7251_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)1117 static int ov7251_get_selection(struct v4l2_subdev *sd,
1118 struct v4l2_subdev_pad_config *cfg,
1119 struct v4l2_subdev_selection *sel)
1120 {
1121 struct ov7251 *ov7251 = to_ov7251(sd);
1122
1123 if (sel->target != V4L2_SEL_TGT_CROP)
1124 return -EINVAL;
1125
1126 mutex_lock(&ov7251->lock);
1127 sel->r = *__ov7251_get_pad_crop(ov7251, cfg, sel->pad,
1128 sel->which);
1129 mutex_unlock(&ov7251->lock);
1130
1131 return 0;
1132 }
1133
ov7251_s_stream(struct v4l2_subdev * subdev,int enable)1134 static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
1135 {
1136 struct ov7251 *ov7251 = to_ov7251(subdev);
1137 int ret;
1138
1139 mutex_lock(&ov7251->lock);
1140
1141 if (enable) {
1142 ret = ov7251_set_register_array(ov7251,
1143 ov7251->current_mode->data,
1144 ov7251->current_mode->data_size);
1145 if (ret < 0) {
1146 dev_err(ov7251->dev, "could not set mode %dx%d\n",
1147 ov7251->current_mode->width,
1148 ov7251->current_mode->height);
1149 goto exit;
1150 }
1151 ret = __v4l2_ctrl_handler_setup(&ov7251->ctrls);
1152 if (ret < 0) {
1153 dev_err(ov7251->dev, "could not sync v4l2 controls\n");
1154 goto exit;
1155 }
1156 ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
1157 OV7251_SC_MODE_SELECT_STREAMING);
1158 } else {
1159 ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
1160 OV7251_SC_MODE_SELECT_SW_STANDBY);
1161 }
1162
1163 exit:
1164 mutex_unlock(&ov7251->lock);
1165
1166 return ret;
1167 }
1168
ov7251_get_frame_interval(struct v4l2_subdev * subdev,struct v4l2_subdev_frame_interval * fi)1169 static int ov7251_get_frame_interval(struct v4l2_subdev *subdev,
1170 struct v4l2_subdev_frame_interval *fi)
1171 {
1172 struct ov7251 *ov7251 = to_ov7251(subdev);
1173
1174 mutex_lock(&ov7251->lock);
1175 fi->interval = ov7251->current_mode->timeperframe;
1176 mutex_unlock(&ov7251->lock);
1177
1178 return 0;
1179 }
1180
ov7251_set_frame_interval(struct v4l2_subdev * subdev,struct v4l2_subdev_frame_interval * fi)1181 static int ov7251_set_frame_interval(struct v4l2_subdev *subdev,
1182 struct v4l2_subdev_frame_interval *fi)
1183 {
1184 struct ov7251 *ov7251 = to_ov7251(subdev);
1185 const struct ov7251_mode_info *new_mode;
1186 int ret = 0;
1187
1188 mutex_lock(&ov7251->lock);
1189 new_mode = ov7251_find_mode_by_ival(ov7251, &fi->interval);
1190
1191 if (new_mode != ov7251->current_mode) {
1192 ret = __v4l2_ctrl_s_ctrl_int64(ov7251->pixel_clock,
1193 new_mode->pixel_clock);
1194 if (ret < 0)
1195 goto exit;
1196
1197 ret = __v4l2_ctrl_s_ctrl(ov7251->link_freq,
1198 new_mode->link_freq);
1199 if (ret < 0)
1200 goto exit;
1201
1202 ret = __v4l2_ctrl_modify_range(ov7251->exposure,
1203 1, new_mode->exposure_max,
1204 1, new_mode->exposure_def);
1205 if (ret < 0)
1206 goto exit;
1207
1208 ret = __v4l2_ctrl_s_ctrl(ov7251->exposure,
1209 new_mode->exposure_def);
1210 if (ret < 0)
1211 goto exit;
1212
1213 ret = __v4l2_ctrl_s_ctrl(ov7251->gain, 16);
1214 if (ret < 0)
1215 goto exit;
1216
1217 ov7251->current_mode = new_mode;
1218 }
1219
1220 fi->interval = ov7251->current_mode->timeperframe;
1221
1222 exit:
1223 mutex_unlock(&ov7251->lock);
1224
1225 return ret;
1226 }
1227
1228 static const struct v4l2_subdev_core_ops ov7251_core_ops = {
1229 .s_power = ov7251_s_power,
1230 };
1231
1232 static const struct v4l2_subdev_video_ops ov7251_video_ops = {
1233 .s_stream = ov7251_s_stream,
1234 .g_frame_interval = ov7251_get_frame_interval,
1235 .s_frame_interval = ov7251_set_frame_interval,
1236 };
1237
1238 static const struct v4l2_subdev_pad_ops ov7251_subdev_pad_ops = {
1239 .init_cfg = ov7251_entity_init_cfg,
1240 .enum_mbus_code = ov7251_enum_mbus_code,
1241 .enum_frame_size = ov7251_enum_frame_size,
1242 .enum_frame_interval = ov7251_enum_frame_ival,
1243 .get_fmt = ov7251_get_format,
1244 .set_fmt = ov7251_set_format,
1245 .get_selection = ov7251_get_selection,
1246 };
1247
1248 static const struct v4l2_subdev_ops ov7251_subdev_ops = {
1249 .core = &ov7251_core_ops,
1250 .video = &ov7251_video_ops,
1251 .pad = &ov7251_subdev_pad_ops,
1252 };
1253
ov7251_probe(struct i2c_client * client)1254 static int ov7251_probe(struct i2c_client *client)
1255 {
1256 struct device *dev = &client->dev;
1257 struct fwnode_handle *endpoint;
1258 struct ov7251 *ov7251;
1259 u8 chip_id_high, chip_id_low, chip_rev;
1260 int ret;
1261
1262 ov7251 = devm_kzalloc(dev, sizeof(struct ov7251), GFP_KERNEL);
1263 if (!ov7251)
1264 return -ENOMEM;
1265
1266 ov7251->i2c_client = client;
1267 ov7251->dev = dev;
1268
1269 endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
1270 if (!endpoint) {
1271 dev_err(dev, "endpoint node not found\n");
1272 return -EINVAL;
1273 }
1274
1275 ret = v4l2_fwnode_endpoint_parse(endpoint, &ov7251->ep);
1276 fwnode_handle_put(endpoint);
1277 if (ret < 0) {
1278 dev_err(dev, "parsing endpoint node failed\n");
1279 return ret;
1280 }
1281
1282 if (ov7251->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
1283 dev_err(dev, "invalid bus type (%u), must be CSI2 (%u)\n",
1284 ov7251->ep.bus_type, V4L2_MBUS_CSI2_DPHY);
1285 return -EINVAL;
1286 }
1287
1288 /* get system clock (xclk) */
1289 ov7251->xclk = devm_clk_get(dev, "xclk");
1290 if (IS_ERR(ov7251->xclk)) {
1291 dev_err(dev, "could not get xclk");
1292 return PTR_ERR(ov7251->xclk);
1293 }
1294
1295 ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
1296 &ov7251->xclk_freq);
1297 if (ret) {
1298 dev_err(dev, "could not get xclk frequency\n");
1299 return ret;
1300 }
1301
1302 /* external clock must be 24MHz, allow 1% tolerance */
1303 if (ov7251->xclk_freq < 23760000 || ov7251->xclk_freq > 24240000) {
1304 dev_err(dev, "external clock frequency %u is not supported\n",
1305 ov7251->xclk_freq);
1306 return -EINVAL;
1307 }
1308
1309 ret = clk_set_rate(ov7251->xclk, ov7251->xclk_freq);
1310 if (ret) {
1311 dev_err(dev, "could not set xclk frequency\n");
1312 return ret;
1313 }
1314
1315 ov7251->io_regulator = devm_regulator_get(dev, "vdddo");
1316 if (IS_ERR(ov7251->io_regulator)) {
1317 dev_err(dev, "cannot get io regulator\n");
1318 return PTR_ERR(ov7251->io_regulator);
1319 }
1320
1321 ov7251->core_regulator = devm_regulator_get(dev, "vddd");
1322 if (IS_ERR(ov7251->core_regulator)) {
1323 dev_err(dev, "cannot get core regulator\n");
1324 return PTR_ERR(ov7251->core_regulator);
1325 }
1326
1327 ov7251->analog_regulator = devm_regulator_get(dev, "vdda");
1328 if (IS_ERR(ov7251->analog_regulator)) {
1329 dev_err(dev, "cannot get analog regulator\n");
1330 return PTR_ERR(ov7251->analog_regulator);
1331 }
1332
1333 ov7251->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
1334 if (IS_ERR(ov7251->enable_gpio)) {
1335 dev_err(dev, "cannot get enable gpio\n");
1336 return PTR_ERR(ov7251->enable_gpio);
1337 }
1338
1339 mutex_init(&ov7251->lock);
1340
1341 v4l2_ctrl_handler_init(&ov7251->ctrls, 7);
1342 ov7251->ctrls.lock = &ov7251->lock;
1343
1344 v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
1345 V4L2_CID_HFLIP, 0, 1, 1, 0);
1346 v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
1347 V4L2_CID_VFLIP, 0, 1, 1, 0);
1348 ov7251->exposure = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
1349 V4L2_CID_EXPOSURE, 1, 32, 1, 32);
1350 ov7251->gain = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
1351 V4L2_CID_GAIN, 16, 1023, 1, 16);
1352 v4l2_ctrl_new_std_menu_items(&ov7251->ctrls, &ov7251_ctrl_ops,
1353 V4L2_CID_TEST_PATTERN,
1354 ARRAY_SIZE(ov7251_test_pattern_menu) - 1,
1355 0, 0, ov7251_test_pattern_menu);
1356 ov7251->pixel_clock = v4l2_ctrl_new_std(&ov7251->ctrls,
1357 &ov7251_ctrl_ops,
1358 V4L2_CID_PIXEL_RATE,
1359 1, INT_MAX, 1, 1);
1360 ov7251->link_freq = v4l2_ctrl_new_int_menu(&ov7251->ctrls,
1361 &ov7251_ctrl_ops,
1362 V4L2_CID_LINK_FREQ,
1363 ARRAY_SIZE(link_freq) - 1,
1364 0, link_freq);
1365 if (ov7251->link_freq)
1366 ov7251->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
1367
1368 ov7251->sd.ctrl_handler = &ov7251->ctrls;
1369
1370 if (ov7251->ctrls.error) {
1371 dev_err(dev, "%s: control initialization error %d\n",
1372 __func__, ov7251->ctrls.error);
1373 ret = ov7251->ctrls.error;
1374 goto free_ctrl;
1375 }
1376
1377 v4l2_i2c_subdev_init(&ov7251->sd, client, &ov7251_subdev_ops);
1378 ov7251->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1379 ov7251->pad.flags = MEDIA_PAD_FL_SOURCE;
1380 ov7251->sd.dev = &client->dev;
1381 ov7251->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1382
1383 ret = media_entity_pads_init(&ov7251->sd.entity, 1, &ov7251->pad);
1384 if (ret < 0) {
1385 dev_err(dev, "could not register media entity\n");
1386 goto free_ctrl;
1387 }
1388
1389 ret = ov7251_s_power(&ov7251->sd, true);
1390 if (ret < 0) {
1391 dev_err(dev, "could not power up OV7251\n");
1392 goto free_entity;
1393 }
1394
1395 ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_HIGH, &chip_id_high);
1396 if (ret < 0 || chip_id_high != OV7251_CHIP_ID_HIGH_BYTE) {
1397 dev_err(dev, "could not read ID high\n");
1398 ret = -ENODEV;
1399 goto power_down;
1400 }
1401 ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_LOW, &chip_id_low);
1402 if (ret < 0 || chip_id_low != OV7251_CHIP_ID_LOW_BYTE) {
1403 dev_err(dev, "could not read ID low\n");
1404 ret = -ENODEV;
1405 goto power_down;
1406 }
1407
1408 ret = ov7251_read_reg(ov7251, OV7251_SC_GP_IO_IN1, &chip_rev);
1409 if (ret < 0) {
1410 dev_err(dev, "could not read revision\n");
1411 ret = -ENODEV;
1412 goto power_down;
1413 }
1414 chip_rev >>= 4;
1415
1416 dev_info(dev, "OV7251 revision %x (%s) detected at address 0x%02x\n",
1417 chip_rev,
1418 chip_rev == 0x4 ? "1A / 1B" :
1419 chip_rev == 0x5 ? "1C / 1D" :
1420 chip_rev == 0x6 ? "1E" :
1421 chip_rev == 0x7 ? "1F" : "unknown",
1422 client->addr);
1423
1424 ret = ov7251_read_reg(ov7251, OV7251_PRE_ISP_00,
1425 &ov7251->pre_isp_00);
1426 if (ret < 0) {
1427 dev_err(dev, "could not read test pattern value\n");
1428 ret = -ENODEV;
1429 goto power_down;
1430 }
1431
1432 ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT1,
1433 &ov7251->timing_format1);
1434 if (ret < 0) {
1435 dev_err(dev, "could not read vflip value\n");
1436 ret = -ENODEV;
1437 goto power_down;
1438 }
1439
1440 ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT2,
1441 &ov7251->timing_format2);
1442 if (ret < 0) {
1443 dev_err(dev, "could not read hflip value\n");
1444 ret = -ENODEV;
1445 goto power_down;
1446 }
1447
1448 ov7251_s_power(&ov7251->sd, false);
1449
1450 ret = v4l2_async_register_subdev(&ov7251->sd);
1451 if (ret < 0) {
1452 dev_err(dev, "could not register v4l2 device\n");
1453 goto free_entity;
1454 }
1455
1456 ov7251_entity_init_cfg(&ov7251->sd, NULL);
1457
1458 return 0;
1459
1460 power_down:
1461 ov7251_s_power(&ov7251->sd, false);
1462 free_entity:
1463 media_entity_cleanup(&ov7251->sd.entity);
1464 free_ctrl:
1465 v4l2_ctrl_handler_free(&ov7251->ctrls);
1466 mutex_destroy(&ov7251->lock);
1467
1468 return ret;
1469 }
1470
ov7251_remove(struct i2c_client * client)1471 static int ov7251_remove(struct i2c_client *client)
1472 {
1473 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1474 struct ov7251 *ov7251 = to_ov7251(sd);
1475
1476 v4l2_async_unregister_subdev(&ov7251->sd);
1477 media_entity_cleanup(&ov7251->sd.entity);
1478 v4l2_ctrl_handler_free(&ov7251->ctrls);
1479 mutex_destroy(&ov7251->lock);
1480
1481 return 0;
1482 }
1483
1484 static const struct of_device_id ov7251_of_match[] = {
1485 { .compatible = "ovti,ov7251" },
1486 { /* sentinel */ }
1487 };
1488 MODULE_DEVICE_TABLE(of, ov7251_of_match);
1489
1490 static struct i2c_driver ov7251_i2c_driver = {
1491 .driver = {
1492 .of_match_table = ov7251_of_match,
1493 .name = "ov7251",
1494 },
1495 .probe_new = ov7251_probe,
1496 .remove = ov7251_remove,
1497 };
1498
1499 module_i2c_driver(ov7251_i2c_driver);
1500
1501 MODULE_DESCRIPTION("Omnivision OV7251 Camera Driver");
1502 MODULE_AUTHOR("Todor Tomov <todor.tomov@linaro.org>");
1503 MODULE_LICENSE("GPL v2");
1504
