atomisp-gc2235.c

  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
  8#include <linux/module.h>
  9#include <linux/types.h>
 10#include <linux/kernel.h>
 11#include <linux/mm.h>
 12#include <linux/string.h>
 13#include <linux/errno.h>
 14#include <linux/init.h>
 15#include <linux/kmod.h>
 16#include <linux/device.h>
 17#include <linux/delay.h>
 18#include <linux/slab.h>
 19#include <linux/i2c.h>
 20#include <linux/moduleparam.h>
 21#include <media/v4l2-device.h>
 22#include "../include/linux/atomisp_gmin_platform.h"
 23#include <linux/acpi.h>
 24#include <linux/io.h>
 25
 26#include "gc2235.h"
 27
 28/* i2c read/write stuff */
 29static int gc2235_read_reg(struct i2c_client *client,
 30			   u16 data_length, u16 reg, u16 *val)
 31{
 32	int err;
 33	struct i2c_msg msg[2];
 34	unsigned char data[6];
 35
 36	if (!client->adapter) {
 37		dev_err(&client->dev, "%s error, no client->adapter\n",
 38			__func__);
 39		return -ENODEV;
 40	}
 41
 42	if (data_length != GC2235_8BIT) {
 43		dev_err(&client->dev, "%s error, invalid data length\n",
 44			__func__);
 45		return -EINVAL;
 46	}
 47
 48	memset(msg, 0, sizeof(msg));
 49
 50	msg[0].addr = client->addr;
 51	msg[0].flags = 0;
 52	msg[0].len = 1;
 53	msg[0].buf = data;
 54
 55	/* high byte goes out first */
 56	data[0] = (u8)(reg & 0xff);
 57
 58	msg[1].addr = client->addr;
 59	msg[1].len = data_length;
 60	msg[1].flags = I2C_M_RD;
 61	msg[1].buf = data;
 62
 63	err = i2c_transfer(client->adapter, msg, 2);
 64	if (err != 2) {
 65		if (err >= 0)
 66			err = -EIO;
 67		dev_err(&client->dev,
 68			"read from offset 0x%x error %d", reg, err);
 69		return err;
 70	}
 71
 72	*val = 0;
 73	/* high byte comes first */
 74	if (data_length == GC2235_8BIT)
 75		*val = (u8)data[0];
 76
 77	return 0;
 78}
 79
 80static int gc2235_i2c_write(struct i2c_client *client, u16 len, u8 *data)
 81{
 82	struct i2c_msg msg;
 83	const int num_msg = 1;
 84	int ret;
 85
 86	msg.addr = client->addr;
 87	msg.flags = 0;
 88	msg.len = len;
 89	msg.buf = data;
 90	ret = i2c_transfer(client->adapter, &msg, 1);
 91
 92	return ret == num_msg ? 0 : -EIO;
 93}
 94
 95static int gc2235_write_reg(struct i2c_client *client, u16 data_length,
 96			    u8 reg, u8 val)
 97{
 98	int ret;
 99	unsigned char data[4] = {0};
100	const u16 len = data_length + sizeof(u8); /* 16-bit address + data */
101
102	if (data_length != GC2235_8BIT) {
103		dev_err(&client->dev,
104			"%s error, invalid data_length\n", __func__);
105		return -EINVAL;
106	}
107
108	/* high byte goes out first */
109	data[0] = reg;
110	data[1] = val;
111
112	ret = gc2235_i2c_write(client, len, data);
113	if (ret)
114		dev_err(&client->dev,
115			"write error: wrote 0x%x to offset 0x%x error %d",
116			val, reg, ret);
117
118	return ret;
119}
120
121static int __gc2235_flush_reg_array(struct i2c_client *client,
122				    struct gc2235_write_ctrl *ctrl)
123{
124	u16 size;
125
126	if (ctrl->index == 0)
127		return 0;
128
129	size = sizeof(u8) + ctrl->index; /* 8-bit address + data */
130	ctrl->index = 0;
131
132	return gc2235_i2c_write(client, size, (u8 *)&ctrl->buffer);
133}
134
135static int __gc2235_buf_reg_array(struct i2c_client *client,
136				  struct gc2235_write_ctrl *ctrl,
137				  const struct gc2235_reg *next)
138{
139	int size;
140
141	if (next->type != GC2235_8BIT)
142		return -EINVAL;
143
144	size = 1;
145	ctrl->buffer.data[ctrl->index] = (u8)next->val;
146
147	/* When first item is added, we need to store its starting address */
148	if (ctrl->index == 0)
149		ctrl->buffer.addr = next->reg;
150
151	ctrl->index += size;
152
153	/*
154	 * Buffer cannot guarantee free space for u32? Better flush it to avoid
155	 * possible lack of memory for next item.
156	 */
157	if (ctrl->index + sizeof(u8) >= GC2235_MAX_WRITE_BUF_SIZE)
158		return __gc2235_flush_reg_array(client, ctrl);
159
160	return 0;
161}
162
163static int __gc2235_write_reg_is_consecutive(struct i2c_client *client,
164					     struct gc2235_write_ctrl *ctrl,
165					     const struct gc2235_reg *next)
166{
167	if (ctrl->index == 0)
168		return 1;
169
170	return ctrl->buffer.addr + ctrl->index == next->reg;
171}
172
173static int gc2235_write_reg_array(struct i2c_client *client,
174				  const struct gc2235_reg *reglist)
175{
176	const struct gc2235_reg *next = reglist;
177	struct gc2235_write_ctrl ctrl;
178	int err;
179
180	ctrl.index = 0;
181	for (; next->type != GC2235_TOK_TERM; next++) {
182		switch (next->type & GC2235_TOK_MASK) {
183		case GC2235_TOK_DELAY:
184			err = __gc2235_flush_reg_array(client, &ctrl);
185			if (err)
186				return err;
187			msleep(next->val);
188			break;
189		default:
190			/*
191			 * If next address is not consecutive, data needs to be
192			 * flushed before proceed.
193			 */
194			if (!__gc2235_write_reg_is_consecutive(client, &ctrl,
195							       next)) {
196				err = __gc2235_flush_reg_array(client, &ctrl);
197				if (err)
198					return err;
199			}
200			err = __gc2235_buf_reg_array(client, &ctrl, next);
201			if (err) {
202				dev_err(&client->dev, "%s: write error, aborted\n",
203					__func__);
204				return err;
205			}
206			break;
207		}
208	}
209
210	return __gc2235_flush_reg_array(client, &ctrl);
211}
212
213static long __gc2235_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
214				  int gain, int digitgain)
215
216{
217	struct i2c_client *client = v4l2_get_subdevdata(sd);
218	u16 coarse_integration = (u16)coarse_itg;
219	int ret = 0;
220	u16 expo_coarse_h, expo_coarse_l, gain_val = 0xF0, gain_val2 = 0xF0;
221
222	expo_coarse_h = coarse_integration >> 8;
223	expo_coarse_l = coarse_integration & 0xff;
224
225	ret = gc2235_write_reg(client, GC2235_8BIT,
226			       GC2235_EXPOSURE_H, expo_coarse_h);
227	ret = gc2235_write_reg(client, GC2235_8BIT,
228			       GC2235_EXPOSURE_L, expo_coarse_l);
229
230	if (gain <= 0x58) {
231		gain_val = 0x40;
232		gain_val2 = 0x58;
233	} else if (gain < 256) {
234		gain_val = 0x40;
235		gain_val2 = gain;
236	} else {
237		gain_val2 = 64 * gain / 256;
238		gain_val = 0xff;
239	}
240
241	ret = gc2235_write_reg(client, GC2235_8BIT,
242			       GC2235_GLOBAL_GAIN, (u8)gain_val);
243	ret = gc2235_write_reg(client, GC2235_8BIT,
244			       GC2235_PRE_GAIN, (u8)gain_val2);
245
246	return ret;
247}
248
249static int gc2235_set_exposure(struct v4l2_subdev *sd, int exposure,
250			       int gain, int digitgain)
251{
252	struct gc2235_device *dev = to_gc2235_sensor(sd);
253	int ret;
254
255	mutex_lock(&dev->input_lock);
256	ret = __gc2235_set_exposure(sd, exposure, gain, digitgain);
257	mutex_unlock(&dev->input_lock);
258
259	return ret;
260}
261
262static long gc2235_s_exposure(struct v4l2_subdev *sd,
263			      struct atomisp_exposure *exposure)
264{
265	int exp = exposure->integration_time[0];
266	int gain = exposure->gain[0];
267	int digitgain = exposure->gain[1];
268
269	/* we should not accept the invalid value below. */
270	if (gain == 0) {
271		struct i2c_client *client = v4l2_get_subdevdata(sd);
272
273		v4l2_err(client, "%s: invalid value\n", __func__);
274		return -EINVAL;
275	}
276
277	return gc2235_set_exposure(sd, exp, gain, digitgain);
278}
279
280static long gc2235_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
281{
282	switch (cmd) {
283	case ATOMISP_IOC_S_EXPOSURE:
284		return gc2235_s_exposure(sd, arg);
285	default:
286		return -EINVAL;
287	}
288	return 0;
289}
290
291/*
292 * This returns the exposure time being used. This should only be used
293 * for filling in EXIF data, not for actual image processing.
294 */
295static int gc2235_q_exposure(struct v4l2_subdev *sd, s32 *value)
296{
297	struct i2c_client *client = v4l2_get_subdevdata(sd);
298	u16 reg_v, reg_v2;
299	int ret;
300
301	/* get exposure */
302	ret = gc2235_read_reg(client, GC2235_8BIT,
303			      GC2235_EXPOSURE_L,
304			      &reg_v);
305	if (ret)
306		goto err;
307
308	ret = gc2235_read_reg(client, GC2235_8BIT,
309			      GC2235_EXPOSURE_H,
310			      &reg_v2);
311	if (ret)
312		goto err;
313
314	reg_v += reg_v2 << 8;
315
316	*value = reg_v;
317err:
318	return ret;
319}
320
321static int gc2235_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
322{
323	struct gc2235_device *dev =
324	    container_of(ctrl->handler, struct gc2235_device, ctrl_handler);
325	int ret = 0;
326
327	switch (ctrl->id) {
328	case V4L2_CID_EXPOSURE_ABSOLUTE:
329		ret = gc2235_q_exposure(&dev->sd, &ctrl->val);
330		break;
331	default:
332		ret = -EINVAL;
333	}
334
335	return ret;
336}
337
338static const struct v4l2_ctrl_ops ctrl_ops = {
339	.g_volatile_ctrl = gc2235_g_volatile_ctrl
340};
341
342static struct v4l2_ctrl_config gc2235_controls[] = {
343	{
344		.ops = &ctrl_ops,
345		.id = V4L2_CID_EXPOSURE_ABSOLUTE,
346		.type = V4L2_CTRL_TYPE_INTEGER,
347		.name = "exposure",
348		.min = 0x0,
349		.max = 0xffff,
350		.step = 0x01,
351		.def = 0x00,
352		.flags = 0,
353	},
354};
355
356static int __gc2235_init(struct v4l2_subdev *sd)
357{
358	struct i2c_client *client = v4l2_get_subdevdata(sd);
359
360	/* restore settings */
361	gc2235_res = gc2235_res_preview;
362	N_RES = N_RES_PREVIEW;
363
364	return gc2235_write_reg_array(client, gc2235_init_settings);
365}
366
367static int is_init;
368
369static int power_ctrl(struct v4l2_subdev *sd, bool flag)
370{
371	int ret = -1;
372	struct gc2235_device *dev = to_gc2235_sensor(sd);
373
374	if (!dev || !dev->platform_data)
375		return -ENODEV;
376
377	if (flag) {
378		ret = dev->platform_data->v1p8_ctrl(sd, 1);
379		usleep_range(60, 90);
380		if (ret == 0)
381			ret |= dev->platform_data->v2p8_ctrl(sd, 1);
382	} else {
383		ret = dev->platform_data->v1p8_ctrl(sd, 0);
384		ret |= dev->platform_data->v2p8_ctrl(sd, 0);
385	}
386	return ret;
387}
388
389static int gpio_ctrl(struct v4l2_subdev *sd, bool flag)
390{
391	struct gc2235_device *dev = to_gc2235_sensor(sd);
392	int ret;
393
394	if (!dev || !dev->platform_data)
395		return -ENODEV;
396
397	ret = dev->platform_data->gpio1_ctrl(sd, !flag);
398	usleep_range(60, 90);
399	ret |= dev->platform_data->gpio0_ctrl(sd, flag);
400
401	return ret;
402}
403
404static int power_up(struct v4l2_subdev *sd)
405{
406	struct gc2235_device *dev = to_gc2235_sensor(sd);
407	struct i2c_client *client = v4l2_get_subdevdata(sd);
408	int ret;
409
410	if (!dev->platform_data) {
411		dev_err(&client->dev,
412			"no camera_sensor_platform_data");
413		return -ENODEV;
414	}
415	/* power control */
416	ret = power_ctrl(sd, 1);
417	if (ret)
418		goto fail_power;
419
420	/* according to DS, at least 5ms is needed between DOVDD and PWDN */
421	usleep_range(5000, 6000);
422
423	ret = dev->platform_data->flisclk_ctrl(sd, 1);
424	if (ret)
425		goto fail_clk;
426	usleep_range(5000, 6000);
427
428	/* gpio ctrl */
429	ret = gpio_ctrl(sd, 1);
430	if (ret) {
431		ret = gpio_ctrl(sd, 1);
432		if (ret)
433			goto fail_power;
434	}
435
436	msleep(5);
437	return 0;
438
439fail_clk:
440	gpio_ctrl(sd, 0);
441fail_power:
442	power_ctrl(sd, 0);
443	dev_err(&client->dev, "sensor power-up failed\n");
444
445	return ret;
446}
447
448static int power_down(struct v4l2_subdev *sd)
449{
450	struct gc2235_device *dev = to_gc2235_sensor(sd);
451	struct i2c_client *client = v4l2_get_subdevdata(sd);
452	int ret = 0;
453
454	if (!dev->platform_data) {
455		dev_err(&client->dev,
456			"no camera_sensor_platform_data");
457		return -ENODEV;
458	}
459	/* gpio ctrl */
460	ret = gpio_ctrl(sd, 0);
461	if (ret) {
462		ret = gpio_ctrl(sd, 0);
463		if (ret)
464			dev_err(&client->dev, "gpio failed 2\n");
465	}
466
467	ret = dev->platform_data->flisclk_ctrl(sd, 0);
468	if (ret)
469		dev_err(&client->dev, "flisclk failed\n");
470
471	/* power control */
472	ret = power_ctrl(sd, 0);
473	if (ret)
474		dev_err(&client->dev, "vprog failed.\n");
475
476	return ret;
477}
478
479static int gc2235_s_power(struct v4l2_subdev *sd, int on)
480{
481	int ret;
482
483	if (on == 0) {
484		ret = power_down(sd);
485	} else {
486		ret = power_up(sd);
487		if (!ret)
488			ret = __gc2235_init(sd);
489		is_init = 1;
490	}
491	return ret;
492}
493
494static int gc2235_startup(struct v4l2_subdev *sd)
495{
496	struct gc2235_device *dev = to_gc2235_sensor(sd);
497	struct i2c_client *client = v4l2_get_subdevdata(sd);
498	int ret = 0;
499
500	if (is_init == 0) {
501		/*
502		 * force gc2235 to do a reset in res change, otherwise it
503		 * can not output normal after switching res. and it is not
504		 * necessary for first time run up after power on, for the sack
505		 * of performance
506		 */
507		power_down(sd);
508		power_up(sd);
509		gc2235_write_reg_array(client, gc2235_init_settings);
510	}
511
512	ret = gc2235_write_reg_array(client, dev->res->regs);
513	if (ret) {
514		dev_err(&client->dev, "gc2235 write register err.\n");
515		return ret;
516	}
517	is_init = 0;
518
519	return ret;
520}
521
522static int gc2235_set_fmt(struct v4l2_subdev *sd,
523			  struct v4l2_subdev_state *sd_state,
524			  struct v4l2_subdev_format *format)
525{
526	struct v4l2_mbus_framefmt *fmt = &format->format;
527	struct gc2235_device *dev = to_gc2235_sensor(sd);
528	struct i2c_client *client = v4l2_get_subdevdata(sd);
529	struct camera_mipi_info *gc2235_info = NULL;
530	struct gc2235_resolution *res;
531	int ret = 0;
532
533	gc2235_info = v4l2_get_subdev_hostdata(sd);
534	if (!gc2235_info)
535		return -EINVAL;
536	if (format->pad)
537		return -EINVAL;
538	if (!fmt)
539		return -EINVAL;
540
541	mutex_lock(&dev->input_lock);
542	res = v4l2_find_nearest_size(gc2235_res_preview,
543				     ARRAY_SIZE(gc2235_res_preview), width,
544				     height, fmt->width, fmt->height);
545	if (!res)
546		res = &gc2235_res_preview[N_RES - 1];
547
548	fmt->width = res->width;
549	fmt->height = res->height;
550	dev->res = res;
551
552	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
553	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
554		*v4l2_subdev_state_get_format(sd_state, 0) = *fmt;
555		mutex_unlock(&dev->input_lock);
556		return 0;
557	}
558
559	ret = gc2235_startup(sd);
560	if (ret) {
561		dev_err(&client->dev, "gc2235 startup err\n");
562		goto err;
563	}
564
565err:
566	mutex_unlock(&dev->input_lock);
567	return ret;
568}
569
570static int gc2235_get_fmt(struct v4l2_subdev *sd,
571			  struct v4l2_subdev_state *sd_state,
572			  struct v4l2_subdev_format *format)
573{
574	struct v4l2_mbus_framefmt *fmt = &format->format;
575	struct gc2235_device *dev = to_gc2235_sensor(sd);
576
577	if (format->pad)
578		return -EINVAL;
579
580	if (!fmt)
581		return -EINVAL;
582
583	fmt->width = dev->res->width;
584	fmt->height = dev->res->height;
585	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
586
587	return 0;
588}
589
590static int gc2235_detect(struct i2c_client *client)
591{
592	struct i2c_adapter *adapter = client->adapter;
593	u16 high = 0, low = 0;
594	u16 id;
595
596	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
597		return -ENODEV;
598
599	gc2235_read_reg(client, GC2235_8BIT, GC2235_SENSOR_ID_H, &high);
600	gc2235_read_reg(client, GC2235_8BIT, GC2235_SENSOR_ID_L, &low);
601	id = ((high << 8) | low);
602
603	if (id != GC2235_ID) {
604		dev_err(&client->dev, "sensor ID error, 0x%x\n", id);
605		return -ENODEV;
606	}
607
608	dev_info(&client->dev, "detect gc2235 success\n");
609	return 0;
610}
611
612static int gc2235_s_stream(struct v4l2_subdev *sd, int enable)
613{
614	struct gc2235_device *dev = to_gc2235_sensor(sd);
615	struct i2c_client *client = v4l2_get_subdevdata(sd);
616	int ret;
617
618	mutex_lock(&dev->input_lock);
619
620	if (enable)
621		ret = gc2235_write_reg_array(client, gc2235_stream_on);
622	else
623		ret = gc2235_write_reg_array(client, gc2235_stream_off);
624
625	mutex_unlock(&dev->input_lock);
626	return ret;
627}
628
629static int gc2235_s_config(struct v4l2_subdev *sd,
630			   int irq, void *platform_data)
631{
632	struct gc2235_device *dev = to_gc2235_sensor(sd);
633	struct i2c_client *client = v4l2_get_subdevdata(sd);
634	int ret = 0;
635
636	if (!platform_data)
637		return -ENODEV;
638
639	dev->platform_data =
640	    (struct camera_sensor_platform_data *)platform_data;
641
642	mutex_lock(&dev->input_lock);
643	/*
644	 * power off the module, then power on it in future
645	 * as first power on by board may not fulfill the
646	 * power on sequqence needed by the module
647	 */
648	ret = power_down(sd);
649	if (ret) {
650		dev_err(&client->dev, "gc2235 power-off err.\n");
651		goto fail_power_off;
652	}
653
654	ret = power_up(sd);
655	if (ret) {
656		dev_err(&client->dev, "gc2235 power-up err.\n");
657		goto fail_power_on;
658	}
659
660	ret = dev->platform_data->csi_cfg(sd, 1);
661	if (ret)
662		goto fail_csi_cfg;
663
664	/* config & detect sensor */
665	ret = gc2235_detect(client);
666	if (ret) {
667		dev_err(&client->dev, "gc2235_detect err s_config.\n");
668		goto fail_csi_cfg;
669	}
670
671	/* turn off sensor, after probed */
672	ret = power_down(sd);
673	if (ret) {
674		dev_err(&client->dev, "gc2235 power-off err.\n");
675		goto fail_csi_cfg;
676	}
677	mutex_unlock(&dev->input_lock);
678
679	return 0;
680
681fail_csi_cfg:
682	dev->platform_data->csi_cfg(sd, 0);
683fail_power_on:
684	power_down(sd);
685	dev_err(&client->dev, "sensor power-gating failed\n");
686fail_power_off:
687	mutex_unlock(&dev->input_lock);
688	return ret;
689}
690
691static int gc2235_get_frame_interval(struct v4l2_subdev *sd,
692				     struct v4l2_subdev_state *sd_state,
693				     struct v4l2_subdev_frame_interval *interval)
694{
695	struct gc2235_device *dev = to_gc2235_sensor(sd);
696
697	/*
698	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
699	 * subdev active state API.
700	 */
701	if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE)
702		return -EINVAL;
703
704	interval->interval.numerator = 1;
705	interval->interval.denominator = dev->res->fps;
706
707	return 0;
708}
709
710static int gc2235_enum_mbus_code(struct v4l2_subdev *sd,
711				 struct v4l2_subdev_state *sd_state,
712				 struct v4l2_subdev_mbus_code_enum *code)
713{
714	if (code->index >= MAX_FMTS)
715		return -EINVAL;
716
717	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
718	return 0;
719}
720
721static int gc2235_enum_frame_size(struct v4l2_subdev *sd,
722				  struct v4l2_subdev_state *sd_state,
723				  struct v4l2_subdev_frame_size_enum *fse)
724{
725	int index = fse->index;
726
727	if (index >= N_RES)
728		return -EINVAL;
729
730	fse->min_width = gc2235_res[index].width;
731	fse->min_height = gc2235_res[index].height;
732	fse->max_width = gc2235_res[index].width;
733	fse->max_height = gc2235_res[index].height;
734
735	return 0;
736}
737
738static int gc2235_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
739{
740	struct gc2235_device *dev = to_gc2235_sensor(sd);
741
742	mutex_lock(&dev->input_lock);
743	*frames = dev->res->skip_frames;
744	mutex_unlock(&dev->input_lock);
745
746	return 0;
747}
748
749static const struct v4l2_subdev_sensor_ops gc2235_sensor_ops = {
750	.g_skip_frames	= gc2235_g_skip_frames,
751};
752
753static const struct v4l2_subdev_video_ops gc2235_video_ops = {
754	.s_stream = gc2235_s_stream,
755};
756
757static const struct v4l2_subdev_core_ops gc2235_core_ops = {
758	.s_power = gc2235_s_power,
759	.ioctl = gc2235_ioctl,
760};
761
762static const struct v4l2_subdev_pad_ops gc2235_pad_ops = {
763	.enum_mbus_code = gc2235_enum_mbus_code,
764	.enum_frame_size = gc2235_enum_frame_size,
765	.get_fmt = gc2235_get_fmt,
766	.set_fmt = gc2235_set_fmt,
767	.get_frame_interval = gc2235_get_frame_interval,
768};
769
770static const struct v4l2_subdev_ops gc2235_ops = {
771	.core = &gc2235_core_ops,
772	.video = &gc2235_video_ops,
773	.pad = &gc2235_pad_ops,
774	.sensor = &gc2235_sensor_ops,
775};
776
777static void gc2235_remove(struct i2c_client *client)
778{
779	struct v4l2_subdev *sd = i2c_get_clientdata(client);
780	struct gc2235_device *dev = to_gc2235_sensor(sd);
781
782	dev->platform_data->csi_cfg(sd, 0);
783
784	v4l2_device_unregister_subdev(sd);
785	media_entity_cleanup(&dev->sd.entity);
786	v4l2_ctrl_handler_free(&dev->ctrl_handler);
787	kfree(dev);
788}
789
790static int gc2235_probe(struct i2c_client *client)
791{
792	struct gc2235_device *dev;
793	void *gcpdev;
794	int ret;
795	unsigned int i;
796
797	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
798	if (!dev)
799		return -ENOMEM;
800
801	mutex_init(&dev->input_lock);
802
803	dev->res = &gc2235_res_preview[0];
804	v4l2_i2c_subdev_init(&dev->sd, client, &gc2235_ops);
805
806	gcpdev = gmin_camera_platform_data(&dev->sd,
807					   ATOMISP_INPUT_FORMAT_RAW_10,
808					   atomisp_bayer_order_grbg);
809
810	ret = gc2235_s_config(&dev->sd, client->irq, gcpdev);
811	if (ret)
812		goto out_free;
813
814	dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
815	dev->pad.flags = MEDIA_PAD_FL_SOURCE;
816	dev->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
817	dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
818	ret =
819	    v4l2_ctrl_handler_init(&dev->ctrl_handler,
820				   ARRAY_SIZE(gc2235_controls));
821	if (ret) {
822		gc2235_remove(client);
823		return ret;
824	}
825
826	for (i = 0; i < ARRAY_SIZE(gc2235_controls); i++)
827		v4l2_ctrl_new_custom(&dev->ctrl_handler, &gc2235_controls[i],
828				     NULL);
829
830	if (dev->ctrl_handler.error) {
831		gc2235_remove(client);
832		return dev->ctrl_handler.error;
833	}
834
835	/* Use same lock for controls as for everything else. */
836	dev->ctrl_handler.lock = &dev->input_lock;
837	dev->sd.ctrl_handler = &dev->ctrl_handler;
838
839	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
840	if (ret)
841		gc2235_remove(client);
842
843	return atomisp_register_i2c_module(&dev->sd, gcpdev);
844
845out_free:
846	v4l2_device_unregister_subdev(&dev->sd);
847	kfree(dev);
848
849	return ret;
850}
851
852static const struct acpi_device_id gc2235_acpi_match[] = {
853	{ "INT33F8" },
854	{},
855};
856MODULE_DEVICE_TABLE(acpi, gc2235_acpi_match);
857
858static struct i2c_driver gc2235_driver = {
859	.driver = {
860		.name = "gc2235",
861		.acpi_match_table = gc2235_acpi_match,
862	},
863	.probe = gc2235_probe,
864	.remove = gc2235_remove,
865};
866module_i2c_driver(gc2235_driver);
867
868MODULE_AUTHOR("Shuguang Gong <Shuguang.Gong@intel.com>");
869MODULE_DESCRIPTION("A low-level driver for GC2235 sensors");
870MODULE_LICENSE("GPL");