1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Support for GalaxyCore GC2235 2M camera sensor.
4 *
5 * Copyright (c) 2014 Intel Corporation. All Rights Reserved.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/kmod.h>
26 #include <linux/device.h>
27 #include <linux/delay.h>
28 #include <linux/slab.h>
29 #include <linux/i2c.h>
30 #include <linux/moduleparam.h>
31 #include <media/v4l2-device.h>
32 #include "../include/linux/atomisp_gmin_platform.h"
33 #include <linux/acpi.h>
34 #include <linux/io.h>
35
36 #include "gc2235.h"
37
38 /* i2c read/write stuff */
gc2235_read_reg(struct i2c_client * client,u16 data_length,u16 reg,u16 * val)39 static int gc2235_read_reg(struct i2c_client *client,
40 u16 data_length, u16 reg, u16 *val)
41 {
42 int err;
43 struct i2c_msg msg[2];
44 unsigned char data[6];
45
46 if (!client->adapter) {
47 dev_err(&client->dev, "%s error, no client->adapter\n",
48 __func__);
49 return -ENODEV;
50 }
51
52 if (data_length != GC2235_8BIT) {
53 dev_err(&client->dev, "%s error, invalid data length\n",
54 __func__);
55 return -EINVAL;
56 }
57
58 memset(msg, 0, sizeof(msg));
59
60 msg[0].addr = client->addr;
61 msg[0].flags = 0;
62 msg[0].len = 1;
63 msg[0].buf = data;
64
65 /* high byte goes out first */
66 data[0] = (u8)(reg & 0xff);
67
68 msg[1].addr = client->addr;
69 msg[1].len = data_length;
70 msg[1].flags = I2C_M_RD;
71 msg[1].buf = data;
72
73 err = i2c_transfer(client->adapter, msg, 2);
74 if (err != 2) {
75 if (err >= 0)
76 err = -EIO;
77 dev_err(&client->dev,
78 "read from offset 0x%x error %d", reg, err);
79 return err;
80 }
81
82 *val = 0;
83 /* high byte comes first */
84 if (data_length == GC2235_8BIT)
85 *val = (u8)data[0];
86
87 return 0;
88 }
89
gc2235_i2c_write(struct i2c_client * client,u16 len,u8 * data)90 static int gc2235_i2c_write(struct i2c_client *client, u16 len, u8 *data)
91 {
92 struct i2c_msg msg;
93 const int num_msg = 1;
94 int ret;
95
96 msg.addr = client->addr;
97 msg.flags = 0;
98 msg.len = len;
99 msg.buf = data;
100 ret = i2c_transfer(client->adapter, &msg, 1);
101
102 return ret == num_msg ? 0 : -EIO;
103 }
104
gc2235_write_reg(struct i2c_client * client,u16 data_length,u8 reg,u8 val)105 static int gc2235_write_reg(struct i2c_client *client, u16 data_length,
106 u8 reg, u8 val)
107 {
108 int ret;
109 unsigned char data[4] = {0};
110 const u16 len = data_length + sizeof(u8); /* 16-bit address + data */
111
112 if (data_length != GC2235_8BIT) {
113 dev_err(&client->dev,
114 "%s error, invalid data_length\n", __func__);
115 return -EINVAL;
116 }
117
118 /* high byte goes out first */
119 data[0] = reg;
120 data[1] = val;
121
122 ret = gc2235_i2c_write(client, len, data);
123 if (ret)
124 dev_err(&client->dev,
125 "write error: wrote 0x%x to offset 0x%x error %d",
126 val, reg, ret);
127
128 return ret;
129 }
130
__gc2235_flush_reg_array(struct i2c_client * client,struct gc2235_write_ctrl * ctrl)131 static int __gc2235_flush_reg_array(struct i2c_client *client,
132 struct gc2235_write_ctrl *ctrl)
133 {
134 u16 size;
135
136 if (ctrl->index == 0)
137 return 0;
138
139 size = sizeof(u8) + ctrl->index; /* 8-bit address + data */
140 ctrl->index = 0;
141
142 return gc2235_i2c_write(client, size, (u8 *)&ctrl->buffer);
143 }
144
__gc2235_buf_reg_array(struct i2c_client * client,struct gc2235_write_ctrl * ctrl,const struct gc2235_reg * next)145 static int __gc2235_buf_reg_array(struct i2c_client *client,
146 struct gc2235_write_ctrl *ctrl,
147 const struct gc2235_reg *next)
148 {
149 int size;
150
151 if (next->type != GC2235_8BIT)
152 return -EINVAL;
153
154 size = 1;
155 ctrl->buffer.data[ctrl->index] = (u8)next->val;
156
157 /* When first item is added, we need to store its starting address */
158 if (ctrl->index == 0)
159 ctrl->buffer.addr = next->reg;
160
161 ctrl->index += size;
162
163 /*
164 * Buffer cannot guarantee free space for u32? Better flush it to avoid
165 * possible lack of memory for next item.
166 */
167 if (ctrl->index + sizeof(u8) >= GC2235_MAX_WRITE_BUF_SIZE)
168 return __gc2235_flush_reg_array(client, ctrl);
169
170 return 0;
171 }
172
__gc2235_write_reg_is_consecutive(struct i2c_client * client,struct gc2235_write_ctrl * ctrl,const struct gc2235_reg * next)173 static int __gc2235_write_reg_is_consecutive(struct i2c_client *client,
174 struct gc2235_write_ctrl *ctrl,
175 const struct gc2235_reg *next)
176 {
177 if (ctrl->index == 0)
178 return 1;
179
180 return ctrl->buffer.addr + ctrl->index == next->reg;
181 }
182
gc2235_write_reg_array(struct i2c_client * client,const struct gc2235_reg * reglist)183 static int gc2235_write_reg_array(struct i2c_client *client,
184 const struct gc2235_reg *reglist)
185 {
186 const struct gc2235_reg *next = reglist;
187 struct gc2235_write_ctrl ctrl;
188 int err;
189
190 ctrl.index = 0;
191 for (; next->type != GC2235_TOK_TERM; next++) {
192 switch (next->type & GC2235_TOK_MASK) {
193 case GC2235_TOK_DELAY:
194 err = __gc2235_flush_reg_array(client, &ctrl);
195 if (err)
196 return err;
197 msleep(next->val);
198 break;
199 default:
200 /*
201 * If next address is not consecutive, data needs to be
202 * flushed before proceed.
203 */
204 if (!__gc2235_write_reg_is_consecutive(client, &ctrl,
205 next)) {
206 err = __gc2235_flush_reg_array(client, &ctrl);
207 if (err)
208 return err;
209 }
210 err = __gc2235_buf_reg_array(client, &ctrl, next);
211 if (err) {
212 dev_err(&client->dev, "%s: write error, aborted\n",
213 __func__);
214 return err;
215 }
216 break;
217 }
218 }
219
220 return __gc2235_flush_reg_array(client, &ctrl);
221 }
222
gc2235_g_focal(struct v4l2_subdev * sd,s32 * val)223 static int gc2235_g_focal(struct v4l2_subdev *sd, s32 *val)
224 {
225 *val = (GC2235_FOCAL_LENGTH_NUM << 16) | GC2235_FOCAL_LENGTH_DEM;
226 return 0;
227 }
228
gc2235_g_fnumber(struct v4l2_subdev * sd,s32 * val)229 static int gc2235_g_fnumber(struct v4l2_subdev *sd, s32 *val)
230 {
231 /* const f number for imx */
232 *val = (GC2235_F_NUMBER_DEFAULT_NUM << 16) | GC2235_F_NUMBER_DEM;
233 return 0;
234 }
235
gc2235_g_fnumber_range(struct v4l2_subdev * sd,s32 * val)236 static int gc2235_g_fnumber_range(struct v4l2_subdev *sd, s32 *val)
237 {
238 *val = (GC2235_F_NUMBER_DEFAULT_NUM << 24) |
239 (GC2235_F_NUMBER_DEM << 16) |
240 (GC2235_F_NUMBER_DEFAULT_NUM << 8) | GC2235_F_NUMBER_DEM;
241 return 0;
242 }
243
gc2235_get_intg_factor(struct i2c_client * client,struct camera_mipi_info * info,const struct gc2235_resolution * res)244 static int gc2235_get_intg_factor(struct i2c_client *client,
245 struct camera_mipi_info *info,
246 const struct gc2235_resolution *res)
247 {
248 struct v4l2_subdev *sd = i2c_get_clientdata(client);
249 struct gc2235_device *dev = to_gc2235_sensor(sd);
250 struct atomisp_sensor_mode_data *buf = &info->data;
251 u16 reg_val, reg_val_h;
252 int ret;
253
254 if (!info)
255 return -EINVAL;
256
257 /* pixel clock calculattion */
258 buf->vt_pix_clk_freq_mhz = dev->vt_pix_clk_freq_mhz = 30000000;
259
260 /* get integration time */
261 buf->coarse_integration_time_min = GC2235_COARSE_INTG_TIME_MIN;
262 buf->coarse_integration_time_max_margin =
263 GC2235_COARSE_INTG_TIME_MAX_MARGIN;
264
265 buf->fine_integration_time_min = GC2235_FINE_INTG_TIME_MIN;
266 buf->fine_integration_time_max_margin =
267 GC2235_FINE_INTG_TIME_MAX_MARGIN;
268
269 buf->fine_integration_time_def = GC2235_FINE_INTG_TIME_MIN;
270 buf->frame_length_lines = res->lines_per_frame;
271 buf->line_length_pck = res->pixels_per_line;
272 buf->read_mode = res->bin_mode;
273
274 /* get the cropping and output resolution to ISP for this mode. */
275 ret = gc2235_read_reg(client, GC2235_8BIT,
276 GC2235_H_CROP_START_H, ®_val_h);
277 ret = gc2235_read_reg(client, GC2235_8BIT,
278 GC2235_H_CROP_START_L, ®_val);
279 if (ret)
280 return ret;
281
282 buf->crop_horizontal_start = (reg_val_h << 8) | reg_val;
283
284 ret = gc2235_read_reg(client, GC2235_8BIT,
285 GC2235_V_CROP_START_H, ®_val_h);
286 ret = gc2235_read_reg(client, GC2235_8BIT,
287 GC2235_V_CROP_START_L, ®_val);
288 if (ret)
289 return ret;
290
291 buf->crop_vertical_start = (reg_val_h << 8) | reg_val;
292
293 ret = gc2235_read_reg(client, GC2235_8BIT,
294 GC2235_H_OUTSIZE_H, ®_val_h);
295 ret = gc2235_read_reg(client, GC2235_8BIT,
296 GC2235_H_OUTSIZE_L, ®_val);
297 if (ret)
298 return ret;
299 buf->output_width = (reg_val_h << 8) | reg_val;
300
301 ret = gc2235_read_reg(client, GC2235_8BIT,
302 GC2235_V_OUTSIZE_H, ®_val_h);
303 ret = gc2235_read_reg(client, GC2235_8BIT,
304 GC2235_V_OUTSIZE_L, ®_val);
305 if (ret)
306 return ret;
307 buf->output_height = (reg_val_h << 8) | reg_val;
308
309 buf->crop_horizontal_end = buf->crop_horizontal_start +
310 buf->output_width - 1;
311 buf->crop_vertical_end = buf->crop_vertical_start +
312 buf->output_height - 1;
313
314 ret = gc2235_read_reg(client, GC2235_8BIT,
315 GC2235_HB_H, ®_val_h);
316 ret = gc2235_read_reg(client, GC2235_8BIT,
317 GC2235_HB_L, ®_val);
318 if (ret)
319 return ret;
320
321 #if 0
322 u16 dummy = (reg_val_h << 8) | reg_val;
323 #endif
324
325 ret = gc2235_read_reg(client, GC2235_8BIT,
326 GC2235_SH_DELAY_H, ®_val_h);
327 ret = gc2235_read_reg(client, GC2235_8BIT,
328 GC2235_SH_DELAY_L, ®_val);
329
330 #if 0
331 buf->line_length_pck = buf->output_width + 16 + dummy +
332 (((u16)reg_val_h << 8) | (u16)reg_val) + 4;
333 #endif
334 ret = gc2235_read_reg(client, GC2235_8BIT,
335 GC2235_VB_H, ®_val_h);
336 ret = gc2235_read_reg(client, GC2235_8BIT,
337 GC2235_VB_L, ®_val);
338 if (ret)
339 return ret;
340
341 #if 0
342 buf->frame_length_lines = buf->output_height + 32 +
343 (((u16)reg_val_h << 8) | (u16)reg_val);
344 #endif
345 buf->binning_factor_x = res->bin_factor_x ?
346 res->bin_factor_x : 1;
347 buf->binning_factor_y = res->bin_factor_y ?
348 res->bin_factor_y : 1;
349 return 0;
350 }
351
__gc2235_set_exposure(struct v4l2_subdev * sd,int coarse_itg,int gain,int digitgain)352 static long __gc2235_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
353 int gain, int digitgain)
354
355 {
356 struct i2c_client *client = v4l2_get_subdevdata(sd);
357 u16 coarse_integration = (u16)coarse_itg;
358 int ret = 0;
359 u16 expo_coarse_h, expo_coarse_l, gain_val = 0xF0, gain_val2 = 0xF0;
360
361 expo_coarse_h = coarse_integration >> 8;
362 expo_coarse_l = coarse_integration & 0xff;
363
364 ret = gc2235_write_reg(client, GC2235_8BIT,
365 GC2235_EXPOSURE_H, expo_coarse_h);
366 ret = gc2235_write_reg(client, GC2235_8BIT,
367 GC2235_EXPOSURE_L, expo_coarse_l);
368
369 if (gain <= 0x58) {
370 gain_val = 0x40;
371 gain_val2 = 0x58;
372 } else if (gain < 256) {
373 gain_val = 0x40;
374 gain_val2 = gain;
375 } else {
376 gain_val2 = 64 * gain / 256;
377 gain_val = 0xff;
378 }
379
380 ret = gc2235_write_reg(client, GC2235_8BIT,
381 GC2235_GLOBAL_GAIN, (u8)gain_val);
382 ret = gc2235_write_reg(client, GC2235_8BIT,
383 GC2235_PRE_GAIN, (u8)gain_val2);
384
385 return ret;
386 }
387
gc2235_set_exposure(struct v4l2_subdev * sd,int exposure,int gain,int digitgain)388 static int gc2235_set_exposure(struct v4l2_subdev *sd, int exposure,
389 int gain, int digitgain)
390 {
391 struct gc2235_device *dev = to_gc2235_sensor(sd);
392 int ret;
393
394 mutex_lock(&dev->input_lock);
395 ret = __gc2235_set_exposure(sd, exposure, gain, digitgain);
396 mutex_unlock(&dev->input_lock);
397
398 return ret;
399 }
400
gc2235_s_exposure(struct v4l2_subdev * sd,struct atomisp_exposure * exposure)401 static long gc2235_s_exposure(struct v4l2_subdev *sd,
402 struct atomisp_exposure *exposure)
403 {
404 int exp = exposure->integration_time[0];
405 int gain = exposure->gain[0];
406 int digitgain = exposure->gain[1];
407
408 /* we should not accept the invalid value below. */
409 if (gain == 0) {
410 struct i2c_client *client = v4l2_get_subdevdata(sd);
411
412 v4l2_err(client, "%s: invalid value\n", __func__);
413 return -EINVAL;
414 }
415
416 return gc2235_set_exposure(sd, exp, gain, digitgain);
417 }
418
gc2235_ioctl(struct v4l2_subdev * sd,unsigned int cmd,void * arg)419 static long gc2235_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
420 {
421 switch (cmd) {
422 case ATOMISP_IOC_S_EXPOSURE:
423 return gc2235_s_exposure(sd, arg);
424 default:
425 return -EINVAL;
426 }
427 return 0;
428 }
429
430 /*
431 * This returns the exposure time being used. This should only be used
432 * for filling in EXIF data, not for actual image processing.
433 */
gc2235_q_exposure(struct v4l2_subdev * sd,s32 * value)434 static int gc2235_q_exposure(struct v4l2_subdev *sd, s32 *value)
435 {
436 struct i2c_client *client = v4l2_get_subdevdata(sd);
437 u16 reg_v, reg_v2;
438 int ret;
439
440 /* get exposure */
441 ret = gc2235_read_reg(client, GC2235_8BIT,
442 GC2235_EXPOSURE_L,
443 ®_v);
444 if (ret)
445 goto err;
446
447 ret = gc2235_read_reg(client, GC2235_8BIT,
448 GC2235_EXPOSURE_H,
449 ®_v2);
450 if (ret)
451 goto err;
452
453 reg_v += reg_v2 << 8;
454
455 *value = reg_v;
456 err:
457 return ret;
458 }
459
gc2235_g_volatile_ctrl(struct v4l2_ctrl * ctrl)460 static int gc2235_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
461 {
462 struct gc2235_device *dev =
463 container_of(ctrl->handler, struct gc2235_device, ctrl_handler);
464 int ret = 0;
465
466 switch (ctrl->id) {
467 case V4L2_CID_EXPOSURE_ABSOLUTE:
468 ret = gc2235_q_exposure(&dev->sd, &ctrl->val);
469 break;
470 case V4L2_CID_FOCAL_ABSOLUTE:
471 ret = gc2235_g_focal(&dev->sd, &ctrl->val);
472 break;
473 case V4L2_CID_FNUMBER_ABSOLUTE:
474 ret = gc2235_g_fnumber(&dev->sd, &ctrl->val);
475 break;
476 case V4L2_CID_FNUMBER_RANGE:
477 ret = gc2235_g_fnumber_range(&dev->sd, &ctrl->val);
478 break;
479 default:
480 ret = -EINVAL;
481 }
482
483 return ret;
484 }
485
486 static const struct v4l2_ctrl_ops ctrl_ops = {
487 .g_volatile_ctrl = gc2235_g_volatile_ctrl
488 };
489
490 static struct v4l2_ctrl_config gc2235_controls[] = {
491 {
492 .ops = &ctrl_ops,
493 .id = V4L2_CID_EXPOSURE_ABSOLUTE,
494 .type = V4L2_CTRL_TYPE_INTEGER,
495 .name = "exposure",
496 .min = 0x0,
497 .max = 0xffff,
498 .step = 0x01,
499 .def = 0x00,
500 .flags = 0,
501 },
502 {
503 .ops = &ctrl_ops,
504 .id = V4L2_CID_FOCAL_ABSOLUTE,
505 .type = V4L2_CTRL_TYPE_INTEGER,
506 .name = "focal length",
507 .min = GC2235_FOCAL_LENGTH_DEFAULT,
508 .max = GC2235_FOCAL_LENGTH_DEFAULT,
509 .step = 0x01,
510 .def = GC2235_FOCAL_LENGTH_DEFAULT,
511 .flags = 0,
512 },
513 {
514 .ops = &ctrl_ops,
515 .id = V4L2_CID_FNUMBER_ABSOLUTE,
516 .type = V4L2_CTRL_TYPE_INTEGER,
517 .name = "f-number",
518 .min = GC2235_F_NUMBER_DEFAULT,
519 .max = GC2235_F_NUMBER_DEFAULT,
520 .step = 0x01,
521 .def = GC2235_F_NUMBER_DEFAULT,
522 .flags = 0,
523 },
524 {
525 .ops = &ctrl_ops,
526 .id = V4L2_CID_FNUMBER_RANGE,
527 .type = V4L2_CTRL_TYPE_INTEGER,
528 .name = "f-number range",
529 .min = GC2235_F_NUMBER_RANGE,
530 .max = GC2235_F_NUMBER_RANGE,
531 .step = 0x01,
532 .def = GC2235_F_NUMBER_RANGE,
533 .flags = 0,
534 },
535 };
536
__gc2235_init(struct v4l2_subdev * sd)537 static int __gc2235_init(struct v4l2_subdev *sd)
538 {
539 struct i2c_client *client = v4l2_get_subdevdata(sd);
540
541 /* restore settings */
542 gc2235_res = gc2235_res_preview;
543 N_RES = N_RES_PREVIEW;
544
545 return gc2235_write_reg_array(client, gc2235_init_settings);
546 }
547
548 static int is_init;
549
power_ctrl(struct v4l2_subdev * sd,bool flag)550 static int power_ctrl(struct v4l2_subdev *sd, bool flag)
551 {
552 int ret = -1;
553 struct gc2235_device *dev = to_gc2235_sensor(sd);
554
555 if (!dev || !dev->platform_data)
556 return -ENODEV;
557
558 if (flag) {
559 ret = dev->platform_data->v1p8_ctrl(sd, 1);
560 usleep_range(60, 90);
561 if (ret == 0)
562 ret |= dev->platform_data->v2p8_ctrl(sd, 1);
563 } else {
564 ret = dev->platform_data->v1p8_ctrl(sd, 0);
565 ret |= dev->platform_data->v2p8_ctrl(sd, 0);
566 }
567 return ret;
568 }
569
gpio_ctrl(struct v4l2_subdev * sd,bool flag)570 static int gpio_ctrl(struct v4l2_subdev *sd, bool flag)
571 {
572 struct gc2235_device *dev = to_gc2235_sensor(sd);
573 int ret = -1;
574
575 if (!dev || !dev->platform_data)
576 return -ENODEV;
577
578 ret |= dev->platform_data->gpio1_ctrl(sd, !flag);
579 usleep_range(60, 90);
580 return dev->platform_data->gpio0_ctrl(sd, flag);
581 }
582
power_up(struct v4l2_subdev * sd)583 static int power_up(struct v4l2_subdev *sd)
584 {
585 struct gc2235_device *dev = to_gc2235_sensor(sd);
586 struct i2c_client *client = v4l2_get_subdevdata(sd);
587 int ret;
588
589 if (!dev->platform_data) {
590 dev_err(&client->dev,
591 "no camera_sensor_platform_data");
592 return -ENODEV;
593 }
594 /* power control */
595 ret = power_ctrl(sd, 1);
596 if (ret)
597 goto fail_power;
598
599 /* according to DS, at least 5ms is needed between DOVDD and PWDN */
600 usleep_range(5000, 6000);
601
602 ret = dev->platform_data->flisclk_ctrl(sd, 1);
603 if (ret)
604 goto fail_clk;
605 usleep_range(5000, 6000);
606
607 /* gpio ctrl */
608 ret = gpio_ctrl(sd, 1);
609 if (ret) {
610 ret = gpio_ctrl(sd, 1);
611 if (ret)
612 goto fail_power;
613 }
614
615 msleep(5);
616 return 0;
617
618 fail_clk:
619 gpio_ctrl(sd, 0);
620 fail_power:
621 power_ctrl(sd, 0);
622 dev_err(&client->dev, "sensor power-up failed\n");
623
624 return ret;
625 }
626
power_down(struct v4l2_subdev * sd)627 static int power_down(struct v4l2_subdev *sd)
628 {
629 struct gc2235_device *dev = to_gc2235_sensor(sd);
630 struct i2c_client *client = v4l2_get_subdevdata(sd);
631 int ret = 0;
632
633 if (!dev->platform_data) {
634 dev_err(&client->dev,
635 "no camera_sensor_platform_data");
636 return -ENODEV;
637 }
638 /* gpio ctrl */
639 ret = gpio_ctrl(sd, 0);
640 if (ret) {
641 ret = gpio_ctrl(sd, 0);
642 if (ret)
643 dev_err(&client->dev, "gpio failed 2\n");
644 }
645
646 ret = dev->platform_data->flisclk_ctrl(sd, 0);
647 if (ret)
648 dev_err(&client->dev, "flisclk failed\n");
649
650 /* power control */
651 ret = power_ctrl(sd, 0);
652 if (ret)
653 dev_err(&client->dev, "vprog failed.\n");
654
655 return ret;
656 }
657
gc2235_s_power(struct v4l2_subdev * sd,int on)658 static int gc2235_s_power(struct v4l2_subdev *sd, int on)
659 {
660 int ret;
661
662 if (on == 0) {
663 ret = power_down(sd);
664 } else {
665 ret = power_up(sd);
666 if (!ret)
667 ret = __gc2235_init(sd);
668 is_init = 1;
669 }
670 return ret;
671 }
672
673 /*
674 * distance - calculate the distance
675 * @res: resolution
676 * @w: width
677 * @h: height
678 *
679 * Get the gap between resolution and w/h.
680 * res->width/height smaller than w/h wouldn't be considered.
681 * Returns the value of gap or -1 if fail.
682 */
683 #define LARGEST_ALLOWED_RATIO_MISMATCH 800
distance(struct gc2235_resolution * res,u32 w,u32 h)684 static int distance(struct gc2235_resolution *res, u32 w, u32 h)
685 {
686 unsigned int w_ratio = (res->width << 13) / w;
687 unsigned int h_ratio;
688 int match;
689
690 if (h == 0)
691 return -1;
692 h_ratio = (res->height << 13) / h;
693 if (h_ratio == 0)
694 return -1;
695 match = abs(((w_ratio << 13) / h_ratio) - 8192);
696
697 if ((w_ratio < 8192) || (h_ratio < 8192) ||
698 (match > LARGEST_ALLOWED_RATIO_MISMATCH))
699 return -1;
700
701 return w_ratio + h_ratio;
702 }
703
704 /* Return the nearest higher resolution index */
nearest_resolution_index(int w,int h)705 static int nearest_resolution_index(int w, int h)
706 {
707 int i;
708 int idx = -1;
709 int dist;
710 int min_dist = INT_MAX;
711 struct gc2235_resolution *tmp_res = NULL;
712
713 for (i = 0; i < N_RES; i++) {
714 tmp_res = &gc2235_res[i];
715 dist = distance(tmp_res, w, h);
716 if (dist == -1)
717 continue;
718 if (dist < min_dist) {
719 min_dist = dist;
720 idx = i;
721 }
722 }
723
724 return idx;
725 }
726
get_resolution_index(int w,int h)727 static int get_resolution_index(int w, int h)
728 {
729 int i;
730
731 for (i = 0; i < N_RES; i++) {
732 if (w != gc2235_res[i].width)
733 continue;
734 if (h != gc2235_res[i].height)
735 continue;
736
737 return i;
738 }
739
740 return -1;
741 }
742
startup(struct v4l2_subdev * sd)743 static int startup(struct v4l2_subdev *sd)
744 {
745 struct gc2235_device *dev = to_gc2235_sensor(sd);
746 struct i2c_client *client = v4l2_get_subdevdata(sd);
747 int ret = 0;
748
749 if (is_init == 0) {
750 /*
751 * force gc2235 to do a reset in res change, otherwise it
752 * can not output normal after switching res. and it is not
753 * necessary for first time run up after power on, for the sack
754 * of performance
755 */
756 power_down(sd);
757 power_up(sd);
758 gc2235_write_reg_array(client, gc2235_init_settings);
759 }
760
761 ret = gc2235_write_reg_array(client, gc2235_res[dev->fmt_idx].regs);
762 if (ret) {
763 dev_err(&client->dev, "gc2235 write register err.\n");
764 return ret;
765 }
766 is_init = 0;
767
768 return ret;
769 }
770
gc2235_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)771 static int gc2235_set_fmt(struct v4l2_subdev *sd,
772 struct v4l2_subdev_state *sd_state,
773 struct v4l2_subdev_format *format)
774 {
775 struct v4l2_mbus_framefmt *fmt = &format->format;
776 struct gc2235_device *dev = to_gc2235_sensor(sd);
777 struct i2c_client *client = v4l2_get_subdevdata(sd);
778 struct camera_mipi_info *gc2235_info = NULL;
779 int ret = 0;
780 int idx;
781
782 gc2235_info = v4l2_get_subdev_hostdata(sd);
783 if (!gc2235_info)
784 return -EINVAL;
785 if (format->pad)
786 return -EINVAL;
787 if (!fmt)
788 return -EINVAL;
789 mutex_lock(&dev->input_lock);
790 idx = nearest_resolution_index(fmt->width, fmt->height);
791 if (idx == -1) {
792 /* return the largest resolution */
793 fmt->width = gc2235_res[N_RES - 1].width;
794 fmt->height = gc2235_res[N_RES - 1].height;
795 } else {
796 fmt->width = gc2235_res[idx].width;
797 fmt->height = gc2235_res[idx].height;
798 }
799 fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
800 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
801 sd_state->pads->try_fmt = *fmt;
802 mutex_unlock(&dev->input_lock);
803 return 0;
804 }
805
806 dev->fmt_idx = get_resolution_index(fmt->width, fmt->height);
807 if (dev->fmt_idx == -1) {
808 dev_err(&client->dev, "get resolution fail\n");
809 mutex_unlock(&dev->input_lock);
810 return -EINVAL;
811 }
812
813 ret = startup(sd);
814 if (ret) {
815 dev_err(&client->dev, "gc2235 startup err\n");
816 goto err;
817 }
818
819 ret = gc2235_get_intg_factor(client, gc2235_info,
820 &gc2235_res[dev->fmt_idx]);
821 if (ret)
822 dev_err(&client->dev, "failed to get integration_factor\n");
823
824 err:
825 mutex_unlock(&dev->input_lock);
826 return ret;
827 }
828
gc2235_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)829 static int gc2235_get_fmt(struct v4l2_subdev *sd,
830 struct v4l2_subdev_state *sd_state,
831 struct v4l2_subdev_format *format)
832 {
833 struct v4l2_mbus_framefmt *fmt = &format->format;
834 struct gc2235_device *dev = to_gc2235_sensor(sd);
835
836 if (format->pad)
837 return -EINVAL;
838
839 if (!fmt)
840 return -EINVAL;
841
842 fmt->width = gc2235_res[dev->fmt_idx].width;
843 fmt->height = gc2235_res[dev->fmt_idx].height;
844 fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
845
846 return 0;
847 }
848
gc2235_detect(struct i2c_client * client)849 static int gc2235_detect(struct i2c_client *client)
850 {
851 struct i2c_adapter *adapter = client->adapter;
852 u16 high = 0, low = 0;
853 u16 id;
854
855 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
856 return -ENODEV;
857
858 gc2235_read_reg(client, GC2235_8BIT, GC2235_SENSOR_ID_H, &high);
859 gc2235_read_reg(client, GC2235_8BIT, GC2235_SENSOR_ID_L, &low);
860 id = ((high << 8) | low);
861
862 if (id != GC2235_ID) {
863 dev_err(&client->dev, "sensor ID error, 0x%x\n", id);
864 return -ENODEV;
865 }
866
867 dev_info(&client->dev, "detect gc2235 success\n");
868 return 0;
869 }
870
gc2235_s_stream(struct v4l2_subdev * sd,int enable)871 static int gc2235_s_stream(struct v4l2_subdev *sd, int enable)
872 {
873 struct gc2235_device *dev = to_gc2235_sensor(sd);
874 struct i2c_client *client = v4l2_get_subdevdata(sd);
875 int ret;
876
877 mutex_lock(&dev->input_lock);
878
879 if (enable)
880 ret = gc2235_write_reg_array(client, gc2235_stream_on);
881 else
882 ret = gc2235_write_reg_array(client, gc2235_stream_off);
883
884 mutex_unlock(&dev->input_lock);
885 return ret;
886 }
887
gc2235_s_config(struct v4l2_subdev * sd,int irq,void * platform_data)888 static int gc2235_s_config(struct v4l2_subdev *sd,
889 int irq, void *platform_data)
890 {
891 struct gc2235_device *dev = to_gc2235_sensor(sd);
892 struct i2c_client *client = v4l2_get_subdevdata(sd);
893 int ret = 0;
894
895 if (!platform_data)
896 return -ENODEV;
897
898 dev->platform_data =
899 (struct camera_sensor_platform_data *)platform_data;
900
901 mutex_lock(&dev->input_lock);
902 /*
903 * power off the module, then power on it in future
904 * as first power on by board may not fulfill the
905 * power on sequqence needed by the module
906 */
907 ret = power_down(sd);
908 if (ret) {
909 dev_err(&client->dev, "gc2235 power-off err.\n");
910 goto fail_power_off;
911 }
912
913 ret = power_up(sd);
914 if (ret) {
915 dev_err(&client->dev, "gc2235 power-up err.\n");
916 goto fail_power_on;
917 }
918
919 ret = dev->platform_data->csi_cfg(sd, 1);
920 if (ret)
921 goto fail_csi_cfg;
922
923 /* config & detect sensor */
924 ret = gc2235_detect(client);
925 if (ret) {
926 dev_err(&client->dev, "gc2235_detect err s_config.\n");
927 goto fail_csi_cfg;
928 }
929
930 /* turn off sensor, after probed */
931 ret = power_down(sd);
932 if (ret) {
933 dev_err(&client->dev, "gc2235 power-off err.\n");
934 goto fail_csi_cfg;
935 }
936 mutex_unlock(&dev->input_lock);
937
938 return 0;
939
940 fail_csi_cfg:
941 dev->platform_data->csi_cfg(sd, 0);
942 fail_power_on:
943 power_down(sd);
944 dev_err(&client->dev, "sensor power-gating failed\n");
945 fail_power_off:
946 mutex_unlock(&dev->input_lock);
947 return ret;
948 }
949
gc2235_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * interval)950 static int gc2235_g_frame_interval(struct v4l2_subdev *sd,
951 struct v4l2_subdev_frame_interval *interval)
952 {
953 struct gc2235_device *dev = to_gc2235_sensor(sd);
954
955 interval->interval.numerator = 1;
956 interval->interval.denominator = gc2235_res[dev->fmt_idx].fps;
957
958 return 0;
959 }
960
gc2235_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)961 static int gc2235_enum_mbus_code(struct v4l2_subdev *sd,
962 struct v4l2_subdev_state *sd_state,
963 struct v4l2_subdev_mbus_code_enum *code)
964 {
965 if (code->index >= MAX_FMTS)
966 return -EINVAL;
967
968 code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
969 return 0;
970 }
971
gc2235_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)972 static int gc2235_enum_frame_size(struct v4l2_subdev *sd,
973 struct v4l2_subdev_state *sd_state,
974 struct v4l2_subdev_frame_size_enum *fse)
975 {
976 int index = fse->index;
977
978 if (index >= N_RES)
979 return -EINVAL;
980
981 fse->min_width = gc2235_res[index].width;
982 fse->min_height = gc2235_res[index].height;
983 fse->max_width = gc2235_res[index].width;
984 fse->max_height = gc2235_res[index].height;
985
986 return 0;
987 }
988
gc2235_g_skip_frames(struct v4l2_subdev * sd,u32 * frames)989 static int gc2235_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
990 {
991 struct gc2235_device *dev = to_gc2235_sensor(sd);
992
993 mutex_lock(&dev->input_lock);
994 *frames = gc2235_res[dev->fmt_idx].skip_frames;
995 mutex_unlock(&dev->input_lock);
996
997 return 0;
998 }
999
1000 static const struct v4l2_subdev_sensor_ops gc2235_sensor_ops = {
1001 .g_skip_frames = gc2235_g_skip_frames,
1002 };
1003
1004 static const struct v4l2_subdev_video_ops gc2235_video_ops = {
1005 .s_stream = gc2235_s_stream,
1006 .g_frame_interval = gc2235_g_frame_interval,
1007 };
1008
1009 static const struct v4l2_subdev_core_ops gc2235_core_ops = {
1010 .s_power = gc2235_s_power,
1011 .ioctl = gc2235_ioctl,
1012 };
1013
1014 static const struct v4l2_subdev_pad_ops gc2235_pad_ops = {
1015 .enum_mbus_code = gc2235_enum_mbus_code,
1016 .enum_frame_size = gc2235_enum_frame_size,
1017 .get_fmt = gc2235_get_fmt,
1018 .set_fmt = gc2235_set_fmt,
1019 };
1020
1021 static const struct v4l2_subdev_ops gc2235_ops = {
1022 .core = &gc2235_core_ops,
1023 .video = &gc2235_video_ops,
1024 .pad = &gc2235_pad_ops,
1025 .sensor = &gc2235_sensor_ops,
1026 };
1027
gc2235_remove(struct i2c_client * client)1028 static int gc2235_remove(struct i2c_client *client)
1029 {
1030 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1031 struct gc2235_device *dev = to_gc2235_sensor(sd);
1032
1033 dev_dbg(&client->dev, "gc2235_remove...\n");
1034
1035 dev->platform_data->csi_cfg(sd, 0);
1036
1037 v4l2_device_unregister_subdev(sd);
1038 media_entity_cleanup(&dev->sd.entity);
1039 v4l2_ctrl_handler_free(&dev->ctrl_handler);
1040 kfree(dev);
1041
1042 return 0;
1043 }
1044
gc2235_probe(struct i2c_client * client)1045 static int gc2235_probe(struct i2c_client *client)
1046 {
1047 struct gc2235_device *dev;
1048 void *gcpdev;
1049 int ret;
1050 unsigned int i;
1051
1052 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1053 if (!dev)
1054 return -ENOMEM;
1055
1056 mutex_init(&dev->input_lock);
1057
1058 dev->fmt_idx = 0;
1059 v4l2_i2c_subdev_init(&dev->sd, client, &gc2235_ops);
1060
1061 gcpdev = gmin_camera_platform_data(&dev->sd,
1062 ATOMISP_INPUT_FORMAT_RAW_10,
1063 atomisp_bayer_order_grbg);
1064
1065 ret = gc2235_s_config(&dev->sd, client->irq, gcpdev);
1066 if (ret)
1067 goto out_free;
1068
1069 dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1070 dev->pad.flags = MEDIA_PAD_FL_SOURCE;
1071 dev->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
1072 dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1073 ret =
1074 v4l2_ctrl_handler_init(&dev->ctrl_handler,
1075 ARRAY_SIZE(gc2235_controls));
1076 if (ret) {
1077 gc2235_remove(client);
1078 return ret;
1079 }
1080
1081 for (i = 0; i < ARRAY_SIZE(gc2235_controls); i++)
1082 v4l2_ctrl_new_custom(&dev->ctrl_handler, &gc2235_controls[i],
1083 NULL);
1084
1085 if (dev->ctrl_handler.error) {
1086 gc2235_remove(client);
1087 return dev->ctrl_handler.error;
1088 }
1089
1090 /* Use same lock for controls as for everything else. */
1091 dev->ctrl_handler.lock = &dev->input_lock;
1092 dev->sd.ctrl_handler = &dev->ctrl_handler;
1093
1094 ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
1095 if (ret)
1096 gc2235_remove(client);
1097
1098 return atomisp_register_i2c_module(&dev->sd, gcpdev, RAW_CAMERA);
1099
1100 out_free:
1101 v4l2_device_unregister_subdev(&dev->sd);
1102 kfree(dev);
1103
1104 return ret;
1105 }
1106
1107 static const struct acpi_device_id gc2235_acpi_match[] = {
1108 { "INT33F8" },
1109 {},
1110 };
1111 MODULE_DEVICE_TABLE(acpi, gc2235_acpi_match);
1112
1113 static struct i2c_driver gc2235_driver = {
1114 .driver = {
1115 .name = "gc2235",
1116 .acpi_match_table = gc2235_acpi_match,
1117 },
1118 .probe_new = gc2235_probe,
1119 .remove = gc2235_remove,
1120 };
1121 module_i2c_driver(gc2235_driver);
1122
1123 MODULE_AUTHOR("Shuguang Gong <Shuguang.Gong@intel.com>");
1124 MODULE_DESCRIPTION("A low-level driver for GC2235 sensors");
1125 MODULE_LICENSE("GPL");
1126