1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for the po1030 sensor
4  *
5  * Copyright (c) 2008 Erik Andrén
6  * Copyright (c) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
7  * Copyright (c) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
8  *
9  * Portions of code to USB interface and ALi driver software,
10  * Copyright (c) 2006 Willem Duinker
11  * v4l2 interface modeled after the V4L2 driver
12  * for SN9C10x PC Camera Controllers
13  */
14 
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 
17 #include "m5602_po1030.h"
18 
19 static int po1030_s_ctrl(struct v4l2_ctrl *ctrl);
20 static void po1030_dump_registers(struct sd *sd);
21 
22 static const unsigned char preinit_po1030[][3] = {
23 	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
24 	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
25 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
26 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
27 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
28 	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
29 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
30 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
31 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
32 	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
33 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
34 	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
35 	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
36 
37 	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
38 
39 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
40 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
41 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
42 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
43 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
44 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
45 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00}
46 };
47 
48 static const unsigned char init_po1030[][3] = {
49 	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
50 	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
51 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
52 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
53 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
54 	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
55 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
56 
57 	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
58 
59 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
60 	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
61 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
62 	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
63 	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
64 	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
65 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
66 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
67 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
68 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
69 
70 	{SENSOR, PO1030_AUTOCTRL2, 0x04},
71 
72 	{SENSOR, PO1030_OUTFORMCTRL2, PO1030_RAW_RGB_BAYER},
73 	{SENSOR, PO1030_AUTOCTRL1, PO1030_WEIGHT_WIN_2X},
74 
75 	{SENSOR, PO1030_CONTROL2, 0x03},
76 	{SENSOR, 0x21, 0x90},
77 	{SENSOR, PO1030_YTARGET, 0x60},
78 	{SENSOR, 0x59, 0x13},
79 	{SENSOR, PO1030_OUTFORMCTRL1, PO1030_HREF_ENABLE},
80 	{SENSOR, PO1030_EDGE_ENH_OFF, 0x00},
81 	{SENSOR, PO1030_EGA, 0x80},
82 	{SENSOR, 0x78, 0x14},
83 	{SENSOR, 0x6f, 0x01},
84 	{SENSOR, PO1030_GLOBALGAINMAX, 0x14},
85 	{SENSOR, PO1030_Cb_U_GAIN, 0x38},
86 	{SENSOR, PO1030_Cr_V_GAIN, 0x38},
87 	{SENSOR, PO1030_CONTROL1, PO1030_SHUTTER_MODE |
88 				  PO1030_AUTO_SUBSAMPLING |
89 				  PO1030_FRAME_EQUAL},
90 	{SENSOR, PO1030_GC0, 0x10},
91 	{SENSOR, PO1030_GC1, 0x20},
92 	{SENSOR, PO1030_GC2, 0x40},
93 	{SENSOR, PO1030_GC3, 0x60},
94 	{SENSOR, PO1030_GC4, 0x80},
95 	{SENSOR, PO1030_GC5, 0xa0},
96 	{SENSOR, PO1030_GC6, 0xc0},
97 	{SENSOR, PO1030_GC7, 0xff},
98 
99 	/* Set the width to 751 */
100 	{SENSOR, PO1030_FRAMEWIDTH_H, 0x02},
101 	{SENSOR, PO1030_FRAMEWIDTH_L, 0xef},
102 
103 	/* Set the height to 540 */
104 	{SENSOR, PO1030_FRAMEHEIGHT_H, 0x02},
105 	{SENSOR, PO1030_FRAMEHEIGHT_L, 0x1c},
106 
107 	/* Set the x window to 1 */
108 	{SENSOR, PO1030_WINDOWX_H, 0x00},
109 	{SENSOR, PO1030_WINDOWX_L, 0x01},
110 
111 	/* Set the y window to 1 */
112 	{SENSOR, PO1030_WINDOWY_H, 0x00},
113 	{SENSOR, PO1030_WINDOWY_L, 0x01},
114 
115 	/* with a very low lighted environment increase the exposure but
116 	 * decrease the FPS (Frame Per Second) */
117 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
118 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
119 
120 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
121 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
122 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
123 	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
124 };
125 
126 static struct v4l2_pix_format po1030_modes[] = {
127 	{
128 		640,
129 		480,
130 		V4L2_PIX_FMT_SBGGR8,
131 		V4L2_FIELD_NONE,
132 		.sizeimage = 640 * 480,
133 		.bytesperline = 640,
134 		.colorspace = V4L2_COLORSPACE_SRGB,
135 		.priv = 2
136 	}
137 };
138 
139 static const struct v4l2_ctrl_ops po1030_ctrl_ops = {
140 	.s_ctrl = po1030_s_ctrl,
141 };
142 
143 static const struct v4l2_ctrl_config po1030_greenbal_cfg = {
144 	.ops	= &po1030_ctrl_ops,
145 	.id	= M5602_V4L2_CID_GREEN_BALANCE,
146 	.name	= "Green Balance",
147 	.type	= V4L2_CTRL_TYPE_INTEGER,
148 	.min	= 0,
149 	.max	= 255,
150 	.step	= 1,
151 	.def	= PO1030_GREEN_GAIN_DEFAULT,
152 	.flags	= V4L2_CTRL_FLAG_SLIDER,
153 };
154 
155 int po1030_probe(struct sd *sd)
156 {
157 	u8 dev_id_h = 0, i;
158 	int err;
159 	struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
160 
161 	if (force_sensor) {
162 		if (force_sensor == PO1030_SENSOR) {
163 			pr_info("Forcing a %s sensor\n", po1030.name);
164 			goto sensor_found;
165 		}
166 		/* If we want to force another sensor, don't try to probe this
167 		 * one */
168 		return -ENODEV;
169 	}
170 
171 	gspca_dbg(gspca_dev, D_PROBE, "Probing for a po1030 sensor\n");
172 
173 	/* Run the pre-init to actually probe the unit */
174 	for (i = 0; i < ARRAY_SIZE(preinit_po1030); i++) {
175 		u8 data = preinit_po1030[i][2];
176 		if (preinit_po1030[i][0] == SENSOR)
177 			err = m5602_write_sensor(sd, preinit_po1030[i][1],
178 						 &data, 1);
179 		else
180 			err = m5602_write_bridge(sd, preinit_po1030[i][1],
181 						 data);
182 		if (err < 0)
183 			return err;
184 	}
185 
186 	if (m5602_read_sensor(sd, PO1030_DEVID_H, &dev_id_h, 1))
187 		return -ENODEV;
188 
189 	if (dev_id_h == 0x30) {
190 		pr_info("Detected a po1030 sensor\n");
191 		goto sensor_found;
192 	}
193 	return -ENODEV;
194 
195 sensor_found:
196 	sd->gspca_dev.cam.cam_mode = po1030_modes;
197 	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(po1030_modes);
198 
199 	return 0;
200 }
201 
202 int po1030_init(struct sd *sd)
203 {
204 	int i, err = 0;
205 
206 	/* Init the sensor */
207 	for (i = 0; i < ARRAY_SIZE(init_po1030) && !err; i++) {
208 		u8 data[2] = {0x00, 0x00};
209 
210 		switch (init_po1030[i][0]) {
211 		case BRIDGE:
212 			err = m5602_write_bridge(sd,
213 				init_po1030[i][1],
214 				init_po1030[i][2]);
215 			break;
216 
217 		case SENSOR:
218 			data[0] = init_po1030[i][2];
219 			err = m5602_write_sensor(sd,
220 				init_po1030[i][1], data, 1);
221 			break;
222 
223 		default:
224 			pr_info("Invalid stream command, exiting init\n");
225 			return -EINVAL;
226 		}
227 	}
228 	if (err < 0)
229 		return err;
230 
231 	if (dump_sensor)
232 		po1030_dump_registers(sd);
233 
234 	return 0;
235 }
236 
237 int po1030_init_controls(struct sd *sd)
238 {
239 	struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
240 
241 	sd->gspca_dev.vdev.ctrl_handler = hdl;
242 	v4l2_ctrl_handler_init(hdl, 9);
243 
244 	sd->auto_white_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
245 					       V4L2_CID_AUTO_WHITE_BALANCE,
246 					       0, 1, 1, 0);
247 	sd->green_bal = v4l2_ctrl_new_custom(hdl, &po1030_greenbal_cfg, NULL);
248 	sd->red_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
249 					V4L2_CID_RED_BALANCE, 0, 255, 1,
250 					PO1030_RED_GAIN_DEFAULT);
251 	sd->blue_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
252 					V4L2_CID_BLUE_BALANCE, 0, 255, 1,
253 					PO1030_BLUE_GAIN_DEFAULT);
254 
255 	sd->autoexpo = v4l2_ctrl_new_std_menu(hdl, &po1030_ctrl_ops,
256 			  V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_MANUAL);
257 	sd->expo = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_EXPOSURE,
258 			  0, 0x2ff, 1, PO1030_EXPOSURE_DEFAULT);
259 
260 	sd->gain = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_GAIN, 0,
261 				     0x4f, 1, PO1030_GLOBAL_GAIN_DEFAULT);
262 
263 	sd->hflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_HFLIP,
264 				      0, 1, 1, 0);
265 	sd->vflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_VFLIP,
266 				      0, 1, 1, 0);
267 
268 	if (hdl->error) {
269 		pr_err("Could not initialize controls\n");
270 		return hdl->error;
271 	}
272 
273 	v4l2_ctrl_auto_cluster(4, &sd->auto_white_bal, 0, false);
274 	v4l2_ctrl_auto_cluster(2, &sd->autoexpo, 0, false);
275 	v4l2_ctrl_cluster(2, &sd->hflip);
276 
277 	return 0;
278 }
279 
280 int po1030_start(struct sd *sd)
281 {
282 	struct cam *cam = &sd->gspca_dev.cam;
283 	int i, err = 0;
284 	int width = cam->cam_mode[sd->gspca_dev.curr_mode].width;
285 	int height = cam->cam_mode[sd->gspca_dev.curr_mode].height;
286 	int ver_offs = cam->cam_mode[sd->gspca_dev.curr_mode].priv;
287 	u8 data;
288 
289 	switch (width) {
290 	case 320:
291 		data = PO1030_SUBSAMPLING;
292 		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
293 		if (err < 0)
294 			return err;
295 
296 		data = ((width + 3) >> 8) & 0xff;
297 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
298 		if (err < 0)
299 			return err;
300 
301 		data = (width + 3) & 0xff;
302 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
303 		if (err < 0)
304 			return err;
305 
306 		data = ((height + 1) >> 8) & 0xff;
307 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
308 		if (err < 0)
309 			return err;
310 
311 		data = (height + 1) & 0xff;
312 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
313 
314 		height += 6;
315 		width -= 1;
316 		break;
317 
318 	case 640:
319 		data = 0;
320 		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
321 		if (err < 0)
322 			return err;
323 
324 		data = ((width + 7) >> 8) & 0xff;
325 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
326 		if (err < 0)
327 			return err;
328 
329 		data = (width + 7) & 0xff;
330 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
331 		if (err < 0)
332 			return err;
333 
334 		data = ((height + 3) >> 8) & 0xff;
335 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
336 		if (err < 0)
337 			return err;
338 
339 		data = (height + 3) & 0xff;
340 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
341 
342 		height += 12;
343 		width -= 2;
344 		break;
345 	}
346 	err = m5602_write_bridge(sd, M5602_XB_SENSOR_TYPE, 0x0c);
347 	if (err < 0)
348 		return err;
349 
350 	err = m5602_write_bridge(sd, M5602_XB_LINE_OF_FRAME_H, 0x81);
351 	if (err < 0)
352 		return err;
353 
354 	err = m5602_write_bridge(sd, M5602_XB_PIX_OF_LINE_H, 0x82);
355 	if (err < 0)
356 		return err;
357 
358 	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0x01);
359 	if (err < 0)
360 		return err;
361 
362 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA,
363 				 ((ver_offs >> 8) & 0xff));
364 	if (err < 0)
365 		return err;
366 
367 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (ver_offs & 0xff));
368 	if (err < 0)
369 		return err;
370 
371 	for (i = 0; i < 2 && !err; i++)
372 		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
373 	if (err < 0)
374 		return err;
375 
376 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height >> 8) & 0xff);
377 	if (err < 0)
378 		return err;
379 
380 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height & 0xff));
381 	if (err < 0)
382 		return err;
383 
384 	for (i = 0; i < 2 && !err; i++)
385 		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
386 
387 	for (i = 0; i < 2 && !err; i++)
388 		err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
389 
390 	for (i = 0; i < 2 && !err; i++)
391 		err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, 0);
392 	if (err < 0)
393 		return err;
394 
395 	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width >> 8) & 0xff);
396 	if (err < 0)
397 		return err;
398 
399 	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width & 0xff));
400 	if (err < 0)
401 		return err;
402 
403 	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
404 	return err;
405 }
406 
407 static int po1030_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
408 {
409 	struct sd *sd = (struct sd *) gspca_dev;
410 	u8 i2c_data;
411 	int err;
412 
413 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to %d\n", val & 0xffff);
414 
415 	i2c_data = ((val & 0xff00) >> 8);
416 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to high byte to 0x%x\n",
417 		  i2c_data);
418 
419 	err = m5602_write_sensor(sd, PO1030_INTEGLINES_H,
420 				  &i2c_data, 1);
421 	if (err < 0)
422 		return err;
423 
424 	i2c_data = (val & 0xff);
425 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to low byte to 0x%x\n",
426 		  i2c_data);
427 	err = m5602_write_sensor(sd, PO1030_INTEGLINES_M,
428 				  &i2c_data, 1);
429 
430 	return err;
431 }
432 
433 static int po1030_set_gain(struct gspca_dev *gspca_dev, __s32 val)
434 {
435 	struct sd *sd = (struct sd *) gspca_dev;
436 	u8 i2c_data;
437 	int err;
438 
439 	i2c_data = val & 0xff;
440 	gspca_dbg(gspca_dev, D_CONF, "Set global gain to %d\n", i2c_data);
441 	err = m5602_write_sensor(sd, PO1030_GLOBALGAIN,
442 				 &i2c_data, 1);
443 	return err;
444 }
445 
446 static int po1030_set_hvflip(struct gspca_dev *gspca_dev)
447 {
448 	struct sd *sd = (struct sd *) gspca_dev;
449 	u8 i2c_data;
450 	int err;
451 
452 	gspca_dbg(gspca_dev, D_CONF, "Set hvflip %d %d\n",
453 		  sd->hflip->val, sd->vflip->val);
454 	err = m5602_read_sensor(sd, PO1030_CONTROL2, &i2c_data, 1);
455 	if (err < 0)
456 		return err;
457 
458 	i2c_data = (0x3f & i2c_data) | (sd->hflip->val << 7) |
459 		   (sd->vflip->val << 6);
460 
461 	err = m5602_write_sensor(sd, PO1030_CONTROL2,
462 				 &i2c_data, 1);
463 
464 	return err;
465 }
466 
467 static int po1030_set_red_balance(struct gspca_dev *gspca_dev, __s32 val)
468 {
469 	struct sd *sd = (struct sd *) gspca_dev;
470 	u8 i2c_data;
471 	int err;
472 
473 	i2c_data = val & 0xff;
474 	gspca_dbg(gspca_dev, D_CONF, "Set red gain to %d\n", i2c_data);
475 	err = m5602_write_sensor(sd, PO1030_RED_GAIN,
476 				  &i2c_data, 1);
477 	return err;
478 }
479 
480 static int po1030_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val)
481 {
482 	struct sd *sd = (struct sd *) gspca_dev;
483 	u8 i2c_data;
484 	int err;
485 
486 	i2c_data = val & 0xff;
487 	gspca_dbg(gspca_dev, D_CONF, "Set blue gain to %d\n", i2c_data);
488 	err = m5602_write_sensor(sd, PO1030_BLUE_GAIN,
489 				  &i2c_data, 1);
490 
491 	return err;
492 }
493 
494 static int po1030_set_green_balance(struct gspca_dev *gspca_dev, __s32 val)
495 {
496 	struct sd *sd = (struct sd *) gspca_dev;
497 	u8 i2c_data;
498 	int err;
499 
500 	i2c_data = val & 0xff;
501 	gspca_dbg(gspca_dev, D_CONF, "Set green gain to %d\n", i2c_data);
502 
503 	err = m5602_write_sensor(sd, PO1030_GREEN_1_GAIN,
504 			   &i2c_data, 1);
505 	if (err < 0)
506 		return err;
507 
508 	return m5602_write_sensor(sd, PO1030_GREEN_2_GAIN,
509 				 &i2c_data, 1);
510 }
511 
512 static int po1030_set_auto_white_balance(struct gspca_dev *gspca_dev,
513 					 __s32 val)
514 {
515 	struct sd *sd = (struct sd *) gspca_dev;
516 	u8 i2c_data;
517 	int err;
518 
519 	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
520 	if (err < 0)
521 		return err;
522 
523 	gspca_dbg(gspca_dev, D_CONF, "Set auto white balance to %d\n", val);
524 	i2c_data = (i2c_data & 0xfe) | (val & 0x01);
525 	err = m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
526 	return err;
527 }
528 
529 static int po1030_set_auto_exposure(struct gspca_dev *gspca_dev,
530 				    __s32 val)
531 {
532 	struct sd *sd = (struct sd *) gspca_dev;
533 	u8 i2c_data;
534 	int err;
535 
536 	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
537 	if (err < 0)
538 		return err;
539 
540 	gspca_dbg(gspca_dev, D_CONF, "Set auto exposure to %d\n", val);
541 	val = (val == V4L2_EXPOSURE_AUTO);
542 	i2c_data = (i2c_data & 0xfd) | ((val & 0x01) << 1);
543 	return m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
544 }
545 
546 void po1030_disconnect(struct sd *sd)
547 {
548 	sd->sensor = NULL;
549 }
550 
551 static int po1030_s_ctrl(struct v4l2_ctrl *ctrl)
552 {
553 	struct gspca_dev *gspca_dev =
554 		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
555 	struct sd *sd = (struct sd *) gspca_dev;
556 	int err;
557 
558 	if (!gspca_dev->streaming)
559 		return 0;
560 
561 	switch (ctrl->id) {
562 	case V4L2_CID_AUTO_WHITE_BALANCE:
563 		err = po1030_set_auto_white_balance(gspca_dev, ctrl->val);
564 		if (err || ctrl->val)
565 			return err;
566 		err = po1030_set_green_balance(gspca_dev, sd->green_bal->val);
567 		if (err)
568 			return err;
569 		err = po1030_set_red_balance(gspca_dev, sd->red_bal->val);
570 		if (err)
571 			return err;
572 		err = po1030_set_blue_balance(gspca_dev, sd->blue_bal->val);
573 		break;
574 	case V4L2_CID_EXPOSURE_AUTO:
575 		err = po1030_set_auto_exposure(gspca_dev, ctrl->val);
576 		if (err || ctrl->val == V4L2_EXPOSURE_AUTO)
577 			return err;
578 		err = po1030_set_exposure(gspca_dev, sd->expo->val);
579 		break;
580 	case V4L2_CID_GAIN:
581 		err = po1030_set_gain(gspca_dev, ctrl->val);
582 		break;
583 	case V4L2_CID_HFLIP:
584 		err = po1030_set_hvflip(gspca_dev);
585 		break;
586 	default:
587 		return -EINVAL;
588 	}
589 
590 	return err;
591 }
592 
593 static void po1030_dump_registers(struct sd *sd)
594 {
595 	int address;
596 	u8 value = 0;
597 
598 	pr_info("Dumping the po1030 sensor core registers\n");
599 	for (address = 0; address < 0x7f; address++) {
600 		m5602_read_sensor(sd, address, &value, 1);
601 		pr_info("register 0x%x contains 0x%x\n", address, value);
602 	}
603 
604 	pr_info("po1030 register state dump complete\n");
605 
606 	pr_info("Probing for which registers that are read/write\n");
607 	for (address = 0; address < 0xff; address++) {
608 		u8 old_value, ctrl_value;
609 		u8 test_value[2] = {0xff, 0xff};
610 
611 		m5602_read_sensor(sd, address, &old_value, 1);
612 		m5602_write_sensor(sd, address, test_value, 1);
613 		m5602_read_sensor(sd, address, &ctrl_value, 1);
614 
615 		if (ctrl_value == test_value[0])
616 			pr_info("register 0x%x is writeable\n", address);
617 		else
618 			pr_info("register 0x%x is read only\n", address);
619 
620 		/* Restore original value */
621 		m5602_write_sensor(sd, address, &old_value, 1);
622 	}
623 }
624