xref: /openbmc/linux/drivers/media/i2c/mt9m001.c (revision aaeb31c0)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Driver for MT9M001 CMOS Image Sensor from Micron
4  *
5  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6  */
7 
8 #include <linux/clk.h>
9 #include <linux/delay.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c.h>
12 #include <linux/log2.h>
13 #include <linux/module.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/slab.h>
16 #include <linux/videodev2.h>
17 
18 #include <media/v4l2-ctrls.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-event.h>
21 #include <media/v4l2-subdev.h>
22 
23 /*
24  * mt9m001 i2c address 0x5d
25  */
26 
27 /* mt9m001 selected register addresses */
28 #define MT9M001_CHIP_VERSION		0x00
29 #define MT9M001_ROW_START		0x01
30 #define MT9M001_COLUMN_START		0x02
31 #define MT9M001_WINDOW_HEIGHT		0x03
32 #define MT9M001_WINDOW_WIDTH		0x04
33 #define MT9M001_HORIZONTAL_BLANKING	0x05
34 #define MT9M001_VERTICAL_BLANKING	0x06
35 #define MT9M001_OUTPUT_CONTROL		0x07
36 #define MT9M001_SHUTTER_WIDTH		0x09
37 #define MT9M001_FRAME_RESTART		0x0b
38 #define MT9M001_SHUTTER_DELAY		0x0c
39 #define MT9M001_RESET			0x0d
40 #define MT9M001_READ_OPTIONS1		0x1e
41 #define MT9M001_READ_OPTIONS2		0x20
42 #define MT9M001_GLOBAL_GAIN		0x35
43 #define MT9M001_CHIP_ENABLE		0xF1
44 
45 #define MT9M001_MAX_WIDTH		1280
46 #define MT9M001_MAX_HEIGHT		1024
47 #define MT9M001_MIN_WIDTH		48
48 #define MT9M001_MIN_HEIGHT		32
49 #define MT9M001_COLUMN_SKIP		20
50 #define MT9M001_ROW_SKIP		12
51 #define MT9M001_DEFAULT_HBLANK		9
52 #define MT9M001_DEFAULT_VBLANK		25
53 
54 /* MT9M001 has only one fixed colorspace per pixelcode */
55 struct mt9m001_datafmt {
56 	u32	code;
57 	enum v4l2_colorspace		colorspace;
58 };
59 
60 /* Find a data format by a pixel code in an array */
mt9m001_find_datafmt(u32 code,const struct mt9m001_datafmt * fmt,int n)61 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
62 	u32 code, const struct mt9m001_datafmt *fmt,
63 	int n)
64 {
65 	int i;
66 	for (i = 0; i < n; i++)
67 		if (fmt[i].code == code)
68 			return fmt + i;
69 
70 	return NULL;
71 }
72 
73 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
74 	/*
75 	 * Order important: first natively supported,
76 	 * second supported with a GPIO extender
77 	 */
78 	{MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
79 	{MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
80 };
81 
82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
83 	/* Order important - see above */
84 	{MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
85 	{MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
86 };
87 
88 struct mt9m001 {
89 	struct v4l2_subdev subdev;
90 	struct v4l2_ctrl_handler hdl;
91 	struct {
92 		/* exposure/auto-exposure cluster */
93 		struct v4l2_ctrl *autoexposure;
94 		struct v4l2_ctrl *exposure;
95 	};
96 	bool streaming;
97 	struct mutex mutex;
98 	struct v4l2_rect rect;	/* Sensor window */
99 	struct clk *clk;
100 	struct gpio_desc *standby_gpio;
101 	struct gpio_desc *reset_gpio;
102 	const struct mt9m001_datafmt *fmt;
103 	const struct mt9m001_datafmt *fmts;
104 	int num_fmts;
105 	unsigned int total_h;
106 	unsigned short y_skip_top;	/* Lines to skip at the top */
107 	struct media_pad pad;
108 };
109 
to_mt9m001(const struct i2c_client * client)110 static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
111 {
112 	return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
113 }
114 
reg_read(struct i2c_client * client,const u8 reg)115 static int reg_read(struct i2c_client *client, const u8 reg)
116 {
117 	return i2c_smbus_read_word_swapped(client, reg);
118 }
119 
reg_write(struct i2c_client * client,const u8 reg,const u16 data)120 static int reg_write(struct i2c_client *client, const u8 reg,
121 		     const u16 data)
122 {
123 	return i2c_smbus_write_word_swapped(client, reg, data);
124 }
125 
reg_set(struct i2c_client * client,const u8 reg,const u16 data)126 static int reg_set(struct i2c_client *client, const u8 reg,
127 		   const u16 data)
128 {
129 	int ret;
130 
131 	ret = reg_read(client, reg);
132 	if (ret < 0)
133 		return ret;
134 	return reg_write(client, reg, ret | data);
135 }
136 
reg_clear(struct i2c_client * client,const u8 reg,const u16 data)137 static int reg_clear(struct i2c_client *client, const u8 reg,
138 		     const u16 data)
139 {
140 	int ret;
141 
142 	ret = reg_read(client, reg);
143 	if (ret < 0)
144 		return ret;
145 	return reg_write(client, reg, ret & ~data);
146 }
147 
148 struct mt9m001_reg {
149 	u8 reg;
150 	u16 data;
151 };
152 
multi_reg_write(struct i2c_client * client,const struct mt9m001_reg * regs,int num)153 static int multi_reg_write(struct i2c_client *client,
154 			   const struct mt9m001_reg *regs, int num)
155 {
156 	int i;
157 
158 	for (i = 0; i < num; i++) {
159 		int ret = reg_write(client, regs[i].reg, regs[i].data);
160 
161 		if (ret)
162 			return ret;
163 	}
164 
165 	return 0;
166 }
167 
mt9m001_init(struct i2c_client * client)168 static int mt9m001_init(struct i2c_client *client)
169 {
170 	static const struct mt9m001_reg init_regs[] = {
171 		/*
172 		 * Issue a soft reset. This returns all registers to their
173 		 * default values.
174 		 */
175 		{ MT9M001_RESET, 1 },
176 		{ MT9M001_RESET, 0 },
177 		/* Disable chip, synchronous option update */
178 		{ MT9M001_OUTPUT_CONTROL, 0 }
179 	};
180 
181 	dev_dbg(&client->dev, "%s\n", __func__);
182 
183 	return multi_reg_write(client, init_regs, ARRAY_SIZE(init_regs));
184 }
185 
mt9m001_apply_selection(struct v4l2_subdev * sd)186 static int mt9m001_apply_selection(struct v4l2_subdev *sd)
187 {
188 	struct i2c_client *client = v4l2_get_subdevdata(sd);
189 	struct mt9m001 *mt9m001 = to_mt9m001(client);
190 	const struct mt9m001_reg regs[] = {
191 		/* Blanking and start values - default... */
192 		{ MT9M001_HORIZONTAL_BLANKING, MT9M001_DEFAULT_HBLANK },
193 		{ MT9M001_VERTICAL_BLANKING, MT9M001_DEFAULT_VBLANK },
194 		/*
195 		 * The caller provides a supported format, as verified per
196 		 * call to .set_fmt(FORMAT_TRY).
197 		 */
198 		{ MT9M001_COLUMN_START, mt9m001->rect.left },
199 		{ MT9M001_ROW_START, mt9m001->rect.top },
200 		{ MT9M001_WINDOW_WIDTH, mt9m001->rect.width - 1 },
201 		{ MT9M001_WINDOW_HEIGHT,
202 			mt9m001->rect.height + mt9m001->y_skip_top - 1 },
203 	};
204 
205 	return multi_reg_write(client, regs, ARRAY_SIZE(regs));
206 }
207 
mt9m001_s_stream(struct v4l2_subdev * sd,int enable)208 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
209 {
210 	struct i2c_client *client = v4l2_get_subdevdata(sd);
211 	struct mt9m001 *mt9m001 = to_mt9m001(client);
212 	int ret = 0;
213 
214 	mutex_lock(&mt9m001->mutex);
215 
216 	if (mt9m001->streaming == enable)
217 		goto done;
218 
219 	if (enable) {
220 		ret = pm_runtime_resume_and_get(&client->dev);
221 		if (ret < 0)
222 			goto unlock;
223 
224 		ret = mt9m001_apply_selection(sd);
225 		if (ret)
226 			goto put_unlock;
227 
228 		ret = __v4l2_ctrl_handler_setup(&mt9m001->hdl);
229 		if (ret)
230 			goto put_unlock;
231 
232 		/* Switch to master "normal" mode */
233 		ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 2);
234 		if (ret < 0)
235 			goto put_unlock;
236 	} else {
237 		/* Switch to master stop sensor readout */
238 		reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
239 		pm_runtime_put(&client->dev);
240 	}
241 
242 	mt9m001->streaming = enable;
243 done:
244 	mutex_unlock(&mt9m001->mutex);
245 
246 	return 0;
247 
248 put_unlock:
249 	pm_runtime_put(&client->dev);
250 unlock:
251 	mutex_unlock(&mt9m001->mutex);
252 
253 	return ret;
254 }
255 
mt9m001_set_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)256 static int mt9m001_set_selection(struct v4l2_subdev *sd,
257 		struct v4l2_subdev_state *sd_state,
258 		struct v4l2_subdev_selection *sel)
259 {
260 	struct i2c_client *client = v4l2_get_subdevdata(sd);
261 	struct mt9m001 *mt9m001 = to_mt9m001(client);
262 	struct v4l2_rect rect = sel->r;
263 
264 	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
265 	    sel->target != V4L2_SEL_TGT_CROP)
266 		return -EINVAL;
267 
268 	if (mt9m001->fmts == mt9m001_colour_fmts)
269 		/*
270 		 * Bayer format - even number of rows for simplicity,
271 		 * but let the user play with the top row.
272 		 */
273 		rect.height = ALIGN(rect.height, 2);
274 
275 	/* Datasheet requirement: see register description */
276 	rect.width = ALIGN(rect.width, 2);
277 	rect.left = ALIGN(rect.left, 2);
278 
279 	rect.width = clamp_t(u32, rect.width, MT9M001_MIN_WIDTH,
280 			MT9M001_MAX_WIDTH);
281 	rect.left = clamp_t(u32, rect.left, MT9M001_COLUMN_SKIP,
282 			MT9M001_COLUMN_SKIP + MT9M001_MAX_WIDTH - rect.width);
283 
284 	rect.height = clamp_t(u32, rect.height, MT9M001_MIN_HEIGHT,
285 			MT9M001_MAX_HEIGHT);
286 	rect.top = clamp_t(u32, rect.top, MT9M001_ROW_SKIP,
287 			MT9M001_ROW_SKIP + MT9M001_MAX_HEIGHT - rect.height);
288 
289 	mt9m001->total_h = rect.height + mt9m001->y_skip_top +
290 			   MT9M001_DEFAULT_VBLANK;
291 
292 	mt9m001->rect = rect;
293 
294 	return 0;
295 }
296 
mt9m001_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)297 static int mt9m001_get_selection(struct v4l2_subdev *sd,
298 		struct v4l2_subdev_state *sd_state,
299 		struct v4l2_subdev_selection *sel)
300 {
301 	struct i2c_client *client = v4l2_get_subdevdata(sd);
302 	struct mt9m001 *mt9m001 = to_mt9m001(client);
303 
304 	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
305 		return -EINVAL;
306 
307 	switch (sel->target) {
308 	case V4L2_SEL_TGT_CROP_BOUNDS:
309 		sel->r.left = MT9M001_COLUMN_SKIP;
310 		sel->r.top = MT9M001_ROW_SKIP;
311 		sel->r.width = MT9M001_MAX_WIDTH;
312 		sel->r.height = MT9M001_MAX_HEIGHT;
313 		return 0;
314 	case V4L2_SEL_TGT_CROP:
315 		sel->r = mt9m001->rect;
316 		return 0;
317 	default:
318 		return -EINVAL;
319 	}
320 }
321 
mt9m001_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)322 static int mt9m001_get_fmt(struct v4l2_subdev *sd,
323 		struct v4l2_subdev_state *sd_state,
324 		struct v4l2_subdev_format *format)
325 {
326 	struct i2c_client *client = v4l2_get_subdevdata(sd);
327 	struct mt9m001 *mt9m001 = to_mt9m001(client);
328 	struct v4l2_mbus_framefmt *mf = &format->format;
329 
330 	if (format->pad)
331 		return -EINVAL;
332 
333 	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
334 		mf = v4l2_subdev_get_try_format(sd, sd_state, 0);
335 		format->format = *mf;
336 		return 0;
337 	}
338 
339 	mf->width	= mt9m001->rect.width;
340 	mf->height	= mt9m001->rect.height;
341 	mf->code	= mt9m001->fmt->code;
342 	mf->colorspace	= mt9m001->fmt->colorspace;
343 	mf->field	= V4L2_FIELD_NONE;
344 	mf->ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT;
345 	mf->quantization = V4L2_QUANTIZATION_DEFAULT;
346 	mf->xfer_func	= V4L2_XFER_FUNC_DEFAULT;
347 
348 	return 0;
349 }
350 
mt9m001_s_fmt(struct v4l2_subdev * sd,const struct mt9m001_datafmt * fmt,struct v4l2_mbus_framefmt * mf)351 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
352 			 const struct mt9m001_datafmt *fmt,
353 			 struct v4l2_mbus_framefmt *mf)
354 {
355 	struct i2c_client *client = v4l2_get_subdevdata(sd);
356 	struct mt9m001 *mt9m001 = to_mt9m001(client);
357 	struct v4l2_subdev_selection sel = {
358 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
359 		.target = V4L2_SEL_TGT_CROP,
360 		.r.left = mt9m001->rect.left,
361 		.r.top = mt9m001->rect.top,
362 		.r.width = mf->width,
363 		.r.height = mf->height,
364 	};
365 	int ret;
366 
367 	/* No support for scaling so far, just crop. TODO: use skipping */
368 	ret = mt9m001_set_selection(sd, NULL, &sel);
369 	if (!ret) {
370 		mf->width	= mt9m001->rect.width;
371 		mf->height	= mt9m001->rect.height;
372 		mt9m001->fmt	= fmt;
373 		mf->colorspace	= fmt->colorspace;
374 	}
375 
376 	return ret;
377 }
378 
mt9m001_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)379 static int mt9m001_set_fmt(struct v4l2_subdev *sd,
380 		struct v4l2_subdev_state *sd_state,
381 		struct v4l2_subdev_format *format)
382 {
383 	struct v4l2_mbus_framefmt *mf = &format->format;
384 	struct i2c_client *client = v4l2_get_subdevdata(sd);
385 	struct mt9m001 *mt9m001 = to_mt9m001(client);
386 	const struct mt9m001_datafmt *fmt;
387 
388 	if (format->pad)
389 		return -EINVAL;
390 
391 	v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
392 		MT9M001_MAX_WIDTH, 1,
393 		&mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
394 		MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
395 
396 	if (mt9m001->fmts == mt9m001_colour_fmts)
397 		mf->height = ALIGN(mf->height - 1, 2);
398 
399 	fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
400 				   mt9m001->num_fmts);
401 	if (!fmt) {
402 		fmt = mt9m001->fmt;
403 		mf->code = fmt->code;
404 	}
405 
406 	mf->colorspace	= fmt->colorspace;
407 	mf->field	= V4L2_FIELD_NONE;
408 	mf->ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT;
409 	mf->quantization = V4L2_QUANTIZATION_DEFAULT;
410 	mf->xfer_func	= V4L2_XFER_FUNC_DEFAULT;
411 
412 	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
413 		return mt9m001_s_fmt(sd, fmt, mf);
414 	sd_state->pads->try_fmt = *mf;
415 	return 0;
416 }
417 
418 #ifdef CONFIG_VIDEO_ADV_DEBUG
mt9m001_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)419 static int mt9m001_g_register(struct v4l2_subdev *sd,
420 			      struct v4l2_dbg_register *reg)
421 {
422 	struct i2c_client *client = v4l2_get_subdevdata(sd);
423 
424 	if (reg->reg > 0xff)
425 		return -EINVAL;
426 
427 	reg->size = 2;
428 	reg->val = reg_read(client, reg->reg);
429 
430 	if (reg->val > 0xffff)
431 		return -EIO;
432 
433 	return 0;
434 }
435 
mt9m001_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)436 static int mt9m001_s_register(struct v4l2_subdev *sd,
437 			      const struct v4l2_dbg_register *reg)
438 {
439 	struct i2c_client *client = v4l2_get_subdevdata(sd);
440 
441 	if (reg->reg > 0xff)
442 		return -EINVAL;
443 
444 	if (reg_write(client, reg->reg, reg->val) < 0)
445 		return -EIO;
446 
447 	return 0;
448 }
449 #endif
450 
mt9m001_power_on(struct device * dev)451 static int mt9m001_power_on(struct device *dev)
452 {
453 	struct i2c_client *client = to_i2c_client(dev);
454 	struct mt9m001 *mt9m001 = to_mt9m001(client);
455 	int ret;
456 
457 	ret = clk_prepare_enable(mt9m001->clk);
458 	if (ret)
459 		return ret;
460 
461 	if (mt9m001->standby_gpio) {
462 		gpiod_set_value_cansleep(mt9m001->standby_gpio, 0);
463 		usleep_range(1000, 2000);
464 	}
465 
466 	if (mt9m001->reset_gpio) {
467 		gpiod_set_value_cansleep(mt9m001->reset_gpio, 1);
468 		usleep_range(1000, 2000);
469 		gpiod_set_value_cansleep(mt9m001->reset_gpio, 0);
470 		usleep_range(1000, 2000);
471 	}
472 
473 	return 0;
474 }
475 
mt9m001_power_off(struct device * dev)476 static int mt9m001_power_off(struct device *dev)
477 {
478 	struct i2c_client *client = to_i2c_client(dev);
479 	struct mt9m001 *mt9m001 = to_mt9m001(client);
480 
481 	gpiod_set_value_cansleep(mt9m001->standby_gpio, 1);
482 	clk_disable_unprepare(mt9m001->clk);
483 
484 	return 0;
485 }
486 
mt9m001_g_volatile_ctrl(struct v4l2_ctrl * ctrl)487 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
488 {
489 	struct mt9m001 *mt9m001 = container_of(ctrl->handler,
490 					       struct mt9m001, hdl);
491 	s32 min, max;
492 
493 	switch (ctrl->id) {
494 	case V4L2_CID_EXPOSURE_AUTO:
495 		min = mt9m001->exposure->minimum;
496 		max = mt9m001->exposure->maximum;
497 		mt9m001->exposure->val =
498 			(524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
499 		break;
500 	}
501 	return 0;
502 }
503 
mt9m001_s_ctrl(struct v4l2_ctrl * ctrl)504 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
505 {
506 	struct mt9m001 *mt9m001 = container_of(ctrl->handler,
507 					       struct mt9m001, hdl);
508 	struct v4l2_subdev *sd = &mt9m001->subdev;
509 	struct i2c_client *client = v4l2_get_subdevdata(sd);
510 	struct v4l2_ctrl *exp = mt9m001->exposure;
511 	int data;
512 	int ret;
513 
514 	if (!pm_runtime_get_if_in_use(&client->dev))
515 		return 0;
516 
517 	switch (ctrl->id) {
518 	case V4L2_CID_VFLIP:
519 		if (ctrl->val)
520 			ret = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
521 		else
522 			ret = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
523 		break;
524 
525 	case V4L2_CID_GAIN:
526 		/* See Datasheet Table 7, Gain settings. */
527 		if (ctrl->val <= ctrl->default_value) {
528 			/* Pack it into 0..1 step 0.125, register values 0..8 */
529 			unsigned long range = ctrl->default_value - ctrl->minimum;
530 			data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
531 
532 			dev_dbg(&client->dev, "Setting gain %d\n", data);
533 			ret = reg_write(client, MT9M001_GLOBAL_GAIN, data);
534 		} else {
535 			/* Pack it into 1.125..15 variable step, register values 9..67 */
536 			/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
537 			unsigned long range = ctrl->maximum - ctrl->default_value - 1;
538 			unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
539 					       111 + range / 2) / range + 9;
540 
541 			if (gain <= 32)
542 				data = gain;
543 			else if (gain <= 64)
544 				data = ((gain - 32) * 16 + 16) / 32 + 80;
545 			else
546 				data = ((gain - 64) * 7 + 28) / 56 + 96;
547 
548 			dev_dbg(&client->dev, "Setting gain from %d to %d\n",
549 				 reg_read(client, MT9M001_GLOBAL_GAIN), data);
550 			ret = reg_write(client, MT9M001_GLOBAL_GAIN, data);
551 		}
552 		break;
553 
554 	case V4L2_CID_EXPOSURE_AUTO:
555 		if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
556 			unsigned long range = exp->maximum - exp->minimum;
557 			unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
558 						 range / 2) / range + 1;
559 
560 			dev_dbg(&client->dev,
561 				"Setting shutter width from %d to %lu\n",
562 				reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
563 			ret = reg_write(client, MT9M001_SHUTTER_WIDTH, shutter);
564 		} else {
565 			mt9m001->total_h = mt9m001->rect.height +
566 				mt9m001->y_skip_top + MT9M001_DEFAULT_VBLANK;
567 			ret = reg_write(client, MT9M001_SHUTTER_WIDTH,
568 					mt9m001->total_h);
569 		}
570 		break;
571 	default:
572 		ret = -EINVAL;
573 		break;
574 	}
575 
576 	pm_runtime_put(&client->dev);
577 
578 	return ret;
579 }
580 
581 /*
582  * Interface active, can use i2c. If it fails, it can indeed mean, that
583  * this wasn't our capture interface, so, we wait for the right one
584  */
mt9m001_video_probe(struct i2c_client * client)585 static int mt9m001_video_probe(struct i2c_client *client)
586 {
587 	struct mt9m001 *mt9m001 = to_mt9m001(client);
588 	s32 data;
589 	int ret;
590 
591 	/* Enable the chip */
592 	data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
593 	dev_dbg(&client->dev, "write: %d\n", data);
594 
595 	/* Read out the chip version register */
596 	data = reg_read(client, MT9M001_CHIP_VERSION);
597 
598 	/* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
599 	switch (data) {
600 	case 0x8411:
601 	case 0x8421:
602 		mt9m001->fmts = mt9m001_colour_fmts;
603 		mt9m001->num_fmts = ARRAY_SIZE(mt9m001_colour_fmts);
604 		break;
605 	case 0x8431:
606 		mt9m001->fmts = mt9m001_monochrome_fmts;
607 		mt9m001->num_fmts = ARRAY_SIZE(mt9m001_monochrome_fmts);
608 		break;
609 	default:
610 		dev_err(&client->dev,
611 			"No MT9M001 chip detected, register read %x\n", data);
612 		ret = -ENODEV;
613 		goto done;
614 	}
615 
616 	mt9m001->fmt = &mt9m001->fmts[0];
617 
618 	dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
619 		 data == 0x8431 ? "C12STM" : "C12ST");
620 
621 	ret = mt9m001_init(client);
622 	if (ret < 0) {
623 		dev_err(&client->dev, "Failed to initialise the camera\n");
624 		goto done;
625 	}
626 
627 	/* mt9m001_init() has reset the chip, returning registers to defaults */
628 	ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
629 
630 done:
631 	return ret;
632 }
633 
mt9m001_g_skip_top_lines(struct v4l2_subdev * sd,u32 * lines)634 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
635 {
636 	struct i2c_client *client = v4l2_get_subdevdata(sd);
637 	struct mt9m001 *mt9m001 = to_mt9m001(client);
638 
639 	*lines = mt9m001->y_skip_top;
640 
641 	return 0;
642 }
643 
644 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
645 	.g_volatile_ctrl = mt9m001_g_volatile_ctrl,
646 	.s_ctrl = mt9m001_s_ctrl,
647 };
648 
649 static const struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
650 	.log_status = v4l2_ctrl_subdev_log_status,
651 	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
652 	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
653 #ifdef CONFIG_VIDEO_ADV_DEBUG
654 	.g_register	= mt9m001_g_register,
655 	.s_register	= mt9m001_s_register,
656 #endif
657 };
658 
mt9m001_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)659 static int mt9m001_init_cfg(struct v4l2_subdev *sd,
660 			    struct v4l2_subdev_state *sd_state)
661 {
662 	struct i2c_client *client = v4l2_get_subdevdata(sd);
663 	struct mt9m001 *mt9m001 = to_mt9m001(client);
664 	struct v4l2_mbus_framefmt *try_fmt =
665 		v4l2_subdev_get_try_format(sd, sd_state, 0);
666 
667 	try_fmt->width		= MT9M001_MAX_WIDTH;
668 	try_fmt->height		= MT9M001_MAX_HEIGHT;
669 	try_fmt->code		= mt9m001->fmts[0].code;
670 	try_fmt->colorspace	= mt9m001->fmts[0].colorspace;
671 	try_fmt->field		= V4L2_FIELD_NONE;
672 	try_fmt->ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT;
673 	try_fmt->quantization	= V4L2_QUANTIZATION_DEFAULT;
674 	try_fmt->xfer_func	= V4L2_XFER_FUNC_DEFAULT;
675 
676 	return 0;
677 }
678 
mt9m001_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)679 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd,
680 		struct v4l2_subdev_state *sd_state,
681 		struct v4l2_subdev_mbus_code_enum *code)
682 {
683 	struct i2c_client *client = v4l2_get_subdevdata(sd);
684 	struct mt9m001 *mt9m001 = to_mt9m001(client);
685 
686 	if (code->pad || code->index >= mt9m001->num_fmts)
687 		return -EINVAL;
688 
689 	code->code = mt9m001->fmts[code->index].code;
690 	return 0;
691 }
692 
mt9m001_get_mbus_config(struct v4l2_subdev * sd,unsigned int pad,struct v4l2_mbus_config * cfg)693 static int mt9m001_get_mbus_config(struct v4l2_subdev *sd,
694 				   unsigned int pad,
695 				   struct v4l2_mbus_config *cfg)
696 {
697 	/* MT9M001 has all capture_format parameters fixed */
698 	cfg->type = V4L2_MBUS_PARALLEL;
699 	cfg->bus.parallel.flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
700 				  V4L2_MBUS_HSYNC_ACTIVE_HIGH |
701 				  V4L2_MBUS_VSYNC_ACTIVE_HIGH |
702 				  V4L2_MBUS_DATA_ACTIVE_HIGH |
703 				  V4L2_MBUS_MASTER;
704 
705 	return 0;
706 }
707 
708 static const struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
709 	.s_stream	= mt9m001_s_stream,
710 };
711 
712 static const struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
713 	.g_skip_top_lines	= mt9m001_g_skip_top_lines,
714 };
715 
716 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = {
717 	.init_cfg	= mt9m001_init_cfg,
718 	.enum_mbus_code = mt9m001_enum_mbus_code,
719 	.get_selection	= mt9m001_get_selection,
720 	.set_selection	= mt9m001_set_selection,
721 	.get_fmt	= mt9m001_get_fmt,
722 	.set_fmt	= mt9m001_set_fmt,
723 	.get_mbus_config = mt9m001_get_mbus_config,
724 };
725 
726 static const struct v4l2_subdev_ops mt9m001_subdev_ops = {
727 	.core	= &mt9m001_subdev_core_ops,
728 	.video	= &mt9m001_subdev_video_ops,
729 	.sensor	= &mt9m001_subdev_sensor_ops,
730 	.pad	= &mt9m001_subdev_pad_ops,
731 };
732 
mt9m001_probe(struct i2c_client * client)733 static int mt9m001_probe(struct i2c_client *client)
734 {
735 	struct mt9m001 *mt9m001;
736 	struct i2c_adapter *adapter = client->adapter;
737 	int ret;
738 
739 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
740 		dev_warn(&adapter->dev,
741 			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
742 		return -EIO;
743 	}
744 
745 	mt9m001 = devm_kzalloc(&client->dev, sizeof(*mt9m001), GFP_KERNEL);
746 	if (!mt9m001)
747 		return -ENOMEM;
748 
749 	mt9m001->clk = devm_clk_get(&client->dev, NULL);
750 	if (IS_ERR(mt9m001->clk))
751 		return PTR_ERR(mt9m001->clk);
752 
753 	mt9m001->standby_gpio = devm_gpiod_get_optional(&client->dev, "standby",
754 							GPIOD_OUT_LOW);
755 	if (IS_ERR(mt9m001->standby_gpio))
756 		return PTR_ERR(mt9m001->standby_gpio);
757 
758 	mt9m001->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
759 						      GPIOD_OUT_LOW);
760 	if (IS_ERR(mt9m001->reset_gpio))
761 		return PTR_ERR(mt9m001->reset_gpio);
762 
763 	v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
764 	mt9m001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
765 				 V4L2_SUBDEV_FL_HAS_EVENTS;
766 	v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
767 	v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
768 			V4L2_CID_VFLIP, 0, 1, 1, 0);
769 	v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
770 			V4L2_CID_GAIN, 0, 127, 1, 64);
771 	mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
772 			V4L2_CID_EXPOSURE, 1, 255, 1, 255);
773 	/*
774 	 * Simulated autoexposure. If enabled, we calculate shutter width
775 	 * ourselves in the driver based on vertical blanking and frame width
776 	 */
777 	mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
778 			&mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
779 			V4L2_EXPOSURE_AUTO);
780 	mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
781 	if (mt9m001->hdl.error)
782 		return mt9m001->hdl.error;
783 
784 	v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
785 					V4L2_EXPOSURE_MANUAL, true);
786 
787 	mutex_init(&mt9m001->mutex);
788 	mt9m001->hdl.lock = &mt9m001->mutex;
789 
790 	/* Second stage probe - when a capture adapter is there */
791 	mt9m001->y_skip_top	= 0;
792 	mt9m001->rect.left	= MT9M001_COLUMN_SKIP;
793 	mt9m001->rect.top	= MT9M001_ROW_SKIP;
794 	mt9m001->rect.width	= MT9M001_MAX_WIDTH;
795 	mt9m001->rect.height	= MT9M001_MAX_HEIGHT;
796 
797 	ret = mt9m001_power_on(&client->dev);
798 	if (ret)
799 		goto error_hdl_free;
800 
801 	pm_runtime_set_active(&client->dev);
802 	pm_runtime_enable(&client->dev);
803 
804 	ret = mt9m001_video_probe(client);
805 	if (ret)
806 		goto error_power_off;
807 
808 	mt9m001->pad.flags = MEDIA_PAD_FL_SOURCE;
809 	mt9m001->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
810 	ret = media_entity_pads_init(&mt9m001->subdev.entity, 1, &mt9m001->pad);
811 	if (ret)
812 		goto error_power_off;
813 
814 	ret = v4l2_async_register_subdev(&mt9m001->subdev);
815 	if (ret)
816 		goto error_entity_cleanup;
817 
818 	pm_runtime_idle(&client->dev);
819 
820 	return 0;
821 
822 error_entity_cleanup:
823 	media_entity_cleanup(&mt9m001->subdev.entity);
824 error_power_off:
825 	pm_runtime_disable(&client->dev);
826 	pm_runtime_set_suspended(&client->dev);
827 	mt9m001_power_off(&client->dev);
828 
829 error_hdl_free:
830 	v4l2_ctrl_handler_free(&mt9m001->hdl);
831 	mutex_destroy(&mt9m001->mutex);
832 
833 	return ret;
834 }
835 
mt9m001_remove(struct i2c_client * client)836 static void mt9m001_remove(struct i2c_client *client)
837 {
838 	struct mt9m001 *mt9m001 = to_mt9m001(client);
839 
840 	/*
841 	 * As it increments RPM usage_count even on errors, we don't need to
842 	 * check the returned code here.
843 	 */
844 	pm_runtime_get_sync(&client->dev);
845 
846 	v4l2_async_unregister_subdev(&mt9m001->subdev);
847 	media_entity_cleanup(&mt9m001->subdev.entity);
848 
849 	pm_runtime_disable(&client->dev);
850 	pm_runtime_set_suspended(&client->dev);
851 	pm_runtime_put_noidle(&client->dev);
852 	mt9m001_power_off(&client->dev);
853 
854 	v4l2_ctrl_handler_free(&mt9m001->hdl);
855 	mutex_destroy(&mt9m001->mutex);
856 }
857 
858 static const struct i2c_device_id mt9m001_id[] = {
859 	{ "mt9m001", 0 },
860 	{ }
861 };
862 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
863 
864 static const struct dev_pm_ops mt9m001_pm_ops = {
865 	SET_RUNTIME_PM_OPS(mt9m001_power_off, mt9m001_power_on, NULL)
866 };
867 
868 static const struct of_device_id mt9m001_of_match[] = {
869 	{ .compatible = "onnn,mt9m001", },
870 	{ /* sentinel */ },
871 };
872 MODULE_DEVICE_TABLE(of, mt9m001_of_match);
873 
874 static struct i2c_driver mt9m001_i2c_driver = {
875 	.driver = {
876 		.name = "mt9m001",
877 		.pm = &mt9m001_pm_ops,
878 		.of_match_table = mt9m001_of_match,
879 	},
880 	.probe		= mt9m001_probe,
881 	.remove		= mt9m001_remove,
882 	.id_table	= mt9m001_id,
883 };
884 
885 module_i2c_driver(mt9m001_i2c_driver);
886 
887 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
888 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
889 MODULE_LICENSE("GPL v2");
890