1 /*
2  * Driver for the po1030 sensor
3  *
4  * Copyright (c) 2008 Erik Andrén
5  * Copyright (c) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
6  * Copyright (c) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
7  *
8  * Portions of code to USB interface and ALi driver software,
9  * Copyright (c) 2006 Willem Duinker
10  * v4l2 interface modeled after the V4L2 driver
11  * for SN9C10x PC Camera Controllers
12  *
13  * This program is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU General Public License as
15  * published by the Free Software Foundation, version 2.
16  *
17  */
18 
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 
21 #include "m5602_po1030.h"
22 
23 static int po1030_s_ctrl(struct v4l2_ctrl *ctrl);
24 static void po1030_dump_registers(struct sd *sd);
25 
26 static const unsigned char preinit_po1030[][3] = {
27 	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
28 	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
29 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
30 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
31 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
32 	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
33 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
34 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
35 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
36 	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
37 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
38 	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
39 	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
40 
41 	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
42 
43 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
44 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
45 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
46 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
47 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
48 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
49 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00}
50 };
51 
52 static const unsigned char init_po1030[][3] = {
53 	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
54 	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
55 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
56 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
57 	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
58 	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
59 	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
60 
61 	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
62 
63 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
64 	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
65 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
66 	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
67 	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
68 	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
69 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
70 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
71 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
72 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
73 
74 	{SENSOR, PO1030_AUTOCTRL2, 0x04},
75 
76 	{SENSOR, PO1030_OUTFORMCTRL2, PO1030_RAW_RGB_BAYER},
77 	{SENSOR, PO1030_AUTOCTRL1, PO1030_WEIGHT_WIN_2X},
78 
79 	{SENSOR, PO1030_CONTROL2, 0x03},
80 	{SENSOR, 0x21, 0x90},
81 	{SENSOR, PO1030_YTARGET, 0x60},
82 	{SENSOR, 0x59, 0x13},
83 	{SENSOR, PO1030_OUTFORMCTRL1, PO1030_HREF_ENABLE},
84 	{SENSOR, PO1030_EDGE_ENH_OFF, 0x00},
85 	{SENSOR, PO1030_EGA, 0x80},
86 	{SENSOR, 0x78, 0x14},
87 	{SENSOR, 0x6f, 0x01},
88 	{SENSOR, PO1030_GLOBALGAINMAX, 0x14},
89 	{SENSOR, PO1030_Cb_U_GAIN, 0x38},
90 	{SENSOR, PO1030_Cr_V_GAIN, 0x38},
91 	{SENSOR, PO1030_CONTROL1, PO1030_SHUTTER_MODE |
92 				  PO1030_AUTO_SUBSAMPLING |
93 				  PO1030_FRAME_EQUAL},
94 	{SENSOR, PO1030_GC0, 0x10},
95 	{SENSOR, PO1030_GC1, 0x20},
96 	{SENSOR, PO1030_GC2, 0x40},
97 	{SENSOR, PO1030_GC3, 0x60},
98 	{SENSOR, PO1030_GC4, 0x80},
99 	{SENSOR, PO1030_GC5, 0xa0},
100 	{SENSOR, PO1030_GC6, 0xc0},
101 	{SENSOR, PO1030_GC7, 0xff},
102 
103 	/* Set the width to 751 */
104 	{SENSOR, PO1030_FRAMEWIDTH_H, 0x02},
105 	{SENSOR, PO1030_FRAMEWIDTH_L, 0xef},
106 
107 	/* Set the height to 540 */
108 	{SENSOR, PO1030_FRAMEHEIGHT_H, 0x02},
109 	{SENSOR, PO1030_FRAMEHEIGHT_L, 0x1c},
110 
111 	/* Set the x window to 1 */
112 	{SENSOR, PO1030_WINDOWX_H, 0x00},
113 	{SENSOR, PO1030_WINDOWX_L, 0x01},
114 
115 	/* Set the y window to 1 */
116 	{SENSOR, PO1030_WINDOWY_H, 0x00},
117 	{SENSOR, PO1030_WINDOWY_L, 0x01},
118 
119 	/* with a very low lighted environment increase the exposure but
120 	 * decrease the FPS (Frame Per Second) */
121 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
122 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
123 
124 	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
125 	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
126 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
127 	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
128 };
129 
130 static struct v4l2_pix_format po1030_modes[] = {
131 	{
132 		640,
133 		480,
134 		V4L2_PIX_FMT_SBGGR8,
135 		V4L2_FIELD_NONE,
136 		.sizeimage = 640 * 480,
137 		.bytesperline = 640,
138 		.colorspace = V4L2_COLORSPACE_SRGB,
139 		.priv = 2
140 	}
141 };
142 
143 static const struct v4l2_ctrl_ops po1030_ctrl_ops = {
144 	.s_ctrl = po1030_s_ctrl,
145 };
146 
147 static const struct v4l2_ctrl_config po1030_greenbal_cfg = {
148 	.ops	= &po1030_ctrl_ops,
149 	.id	= M5602_V4L2_CID_GREEN_BALANCE,
150 	.name	= "Green Balance",
151 	.type	= V4L2_CTRL_TYPE_INTEGER,
152 	.min	= 0,
153 	.max	= 255,
154 	.step	= 1,
155 	.def	= PO1030_GREEN_GAIN_DEFAULT,
156 	.flags	= V4L2_CTRL_FLAG_SLIDER,
157 };
158 
159 int po1030_probe(struct sd *sd)
160 {
161 	int rc = 0;
162 	u8 dev_id_h = 0, i;
163 	struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
164 
165 	if (force_sensor) {
166 		if (force_sensor == PO1030_SENSOR) {
167 			pr_info("Forcing a %s sensor\n", po1030.name);
168 			goto sensor_found;
169 		}
170 		/* If we want to force another sensor, don't try to probe this
171 		 * one */
172 		return -ENODEV;
173 	}
174 
175 	gspca_dbg(gspca_dev, D_PROBE, "Probing for a po1030 sensor\n");
176 
177 	/* Run the pre-init to actually probe the unit */
178 	for (i = 0; i < ARRAY_SIZE(preinit_po1030); i++) {
179 		u8 data = preinit_po1030[i][2];
180 		if (preinit_po1030[i][0] == SENSOR)
181 			rc |= m5602_write_sensor(sd,
182 				preinit_po1030[i][1], &data, 1);
183 		else
184 			rc |= m5602_write_bridge(sd, preinit_po1030[i][1],
185 						data);
186 	}
187 	if (rc < 0)
188 		return rc;
189 
190 	if (m5602_read_sensor(sd, PO1030_DEVID_H, &dev_id_h, 1))
191 		return -ENODEV;
192 
193 	if (dev_id_h == 0x30) {
194 		pr_info("Detected a po1030 sensor\n");
195 		goto sensor_found;
196 	}
197 	return -ENODEV;
198 
199 sensor_found:
200 	sd->gspca_dev.cam.cam_mode = po1030_modes;
201 	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(po1030_modes);
202 
203 	return 0;
204 }
205 
206 int po1030_init(struct sd *sd)
207 {
208 	int i, err = 0;
209 
210 	/* Init the sensor */
211 	for (i = 0; i < ARRAY_SIZE(init_po1030) && !err; i++) {
212 		u8 data[2] = {0x00, 0x00};
213 
214 		switch (init_po1030[i][0]) {
215 		case BRIDGE:
216 			err = m5602_write_bridge(sd,
217 				init_po1030[i][1],
218 				init_po1030[i][2]);
219 			break;
220 
221 		case SENSOR:
222 			data[0] = init_po1030[i][2];
223 			err = m5602_write_sensor(sd,
224 				init_po1030[i][1], data, 1);
225 			break;
226 
227 		default:
228 			pr_info("Invalid stream command, exiting init\n");
229 			return -EINVAL;
230 		}
231 	}
232 	if (err < 0)
233 		return err;
234 
235 	if (dump_sensor)
236 		po1030_dump_registers(sd);
237 
238 	return 0;
239 }
240 
241 int po1030_init_controls(struct sd *sd)
242 {
243 	struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
244 
245 	sd->gspca_dev.vdev.ctrl_handler = hdl;
246 	v4l2_ctrl_handler_init(hdl, 9);
247 
248 	sd->auto_white_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
249 					       V4L2_CID_AUTO_WHITE_BALANCE,
250 					       0, 1, 1, 0);
251 	sd->green_bal = v4l2_ctrl_new_custom(hdl, &po1030_greenbal_cfg, NULL);
252 	sd->red_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
253 					V4L2_CID_RED_BALANCE, 0, 255, 1,
254 					PO1030_RED_GAIN_DEFAULT);
255 	sd->blue_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
256 					V4L2_CID_BLUE_BALANCE, 0, 255, 1,
257 					PO1030_BLUE_GAIN_DEFAULT);
258 
259 	sd->autoexpo = v4l2_ctrl_new_std_menu(hdl, &po1030_ctrl_ops,
260 			  V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_MANUAL);
261 	sd->expo = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_EXPOSURE,
262 			  0, 0x2ff, 1, PO1030_EXPOSURE_DEFAULT);
263 
264 	sd->gain = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_GAIN, 0,
265 				     0x4f, 1, PO1030_GLOBAL_GAIN_DEFAULT);
266 
267 	sd->hflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_HFLIP,
268 				      0, 1, 1, 0);
269 	sd->vflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_VFLIP,
270 				      0, 1, 1, 0);
271 
272 	if (hdl->error) {
273 		pr_err("Could not initialize controls\n");
274 		return hdl->error;
275 	}
276 
277 	v4l2_ctrl_auto_cluster(4, &sd->auto_white_bal, 0, false);
278 	v4l2_ctrl_auto_cluster(2, &sd->autoexpo, 0, false);
279 	v4l2_ctrl_cluster(2, &sd->hflip);
280 
281 	return 0;
282 }
283 
284 int po1030_start(struct sd *sd)
285 {
286 	struct cam *cam = &sd->gspca_dev.cam;
287 	int i, err = 0;
288 	int width = cam->cam_mode[sd->gspca_dev.curr_mode].width;
289 	int height = cam->cam_mode[sd->gspca_dev.curr_mode].height;
290 	int ver_offs = cam->cam_mode[sd->gspca_dev.curr_mode].priv;
291 	u8 data;
292 
293 	switch (width) {
294 	case 320:
295 		data = PO1030_SUBSAMPLING;
296 		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
297 		if (err < 0)
298 			return err;
299 
300 		data = ((width + 3) >> 8) & 0xff;
301 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
302 		if (err < 0)
303 			return err;
304 
305 		data = (width + 3) & 0xff;
306 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
307 		if (err < 0)
308 			return err;
309 
310 		data = ((height + 1) >> 8) & 0xff;
311 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
312 		if (err < 0)
313 			return err;
314 
315 		data = (height + 1) & 0xff;
316 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
317 
318 		height += 6;
319 		width -= 1;
320 		break;
321 
322 	case 640:
323 		data = 0;
324 		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
325 		if (err < 0)
326 			return err;
327 
328 		data = ((width + 7) >> 8) & 0xff;
329 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
330 		if (err < 0)
331 			return err;
332 
333 		data = (width + 7) & 0xff;
334 		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
335 		if (err < 0)
336 			return err;
337 
338 		data = ((height + 3) >> 8) & 0xff;
339 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
340 		if (err < 0)
341 			return err;
342 
343 		data = (height + 3) & 0xff;
344 		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
345 
346 		height += 12;
347 		width -= 2;
348 		break;
349 	}
350 	err = m5602_write_bridge(sd, M5602_XB_SENSOR_TYPE, 0x0c);
351 	if (err < 0)
352 		return err;
353 
354 	err = m5602_write_bridge(sd, M5602_XB_LINE_OF_FRAME_H, 0x81);
355 	if (err < 0)
356 		return err;
357 
358 	err = m5602_write_bridge(sd, M5602_XB_PIX_OF_LINE_H, 0x82);
359 	if (err < 0)
360 		return err;
361 
362 	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0x01);
363 	if (err < 0)
364 		return err;
365 
366 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA,
367 				 ((ver_offs >> 8) & 0xff));
368 	if (err < 0)
369 		return err;
370 
371 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (ver_offs & 0xff));
372 	if (err < 0)
373 		return err;
374 
375 	for (i = 0; i < 2 && !err; i++)
376 		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
377 	if (err < 0)
378 		return err;
379 
380 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height >> 8) & 0xff);
381 	if (err < 0)
382 		return err;
383 
384 	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height & 0xff));
385 	if (err < 0)
386 		return err;
387 
388 	for (i = 0; i < 2 && !err; i++)
389 		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
390 
391 	for (i = 0; i < 2 && !err; i++)
392 		err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
393 
394 	for (i = 0; i < 2 && !err; i++)
395 		err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, 0);
396 	if (err < 0)
397 		return err;
398 
399 	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width >> 8) & 0xff);
400 	if (err < 0)
401 		return err;
402 
403 	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width & 0xff));
404 	if (err < 0)
405 		return err;
406 
407 	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
408 	return err;
409 }
410 
411 static int po1030_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
412 {
413 	struct sd *sd = (struct sd *) gspca_dev;
414 	u8 i2c_data;
415 	int err;
416 
417 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to %d\n", val & 0xffff);
418 
419 	i2c_data = ((val & 0xff00) >> 8);
420 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to high byte to 0x%x\n",
421 		  i2c_data);
422 
423 	err = m5602_write_sensor(sd, PO1030_INTEGLINES_H,
424 				  &i2c_data, 1);
425 	if (err < 0)
426 		return err;
427 
428 	i2c_data = (val & 0xff);
429 	gspca_dbg(gspca_dev, D_CONF, "Set exposure to low byte to 0x%x\n",
430 		  i2c_data);
431 	err = m5602_write_sensor(sd, PO1030_INTEGLINES_M,
432 				  &i2c_data, 1);
433 
434 	return err;
435 }
436 
437 static int po1030_set_gain(struct gspca_dev *gspca_dev, __s32 val)
438 {
439 	struct sd *sd = (struct sd *) gspca_dev;
440 	u8 i2c_data;
441 	int err;
442 
443 	i2c_data = val & 0xff;
444 	gspca_dbg(gspca_dev, D_CONF, "Set global gain to %d\n", i2c_data);
445 	err = m5602_write_sensor(sd, PO1030_GLOBALGAIN,
446 				 &i2c_data, 1);
447 	return err;
448 }
449 
450 static int po1030_set_hvflip(struct gspca_dev *gspca_dev)
451 {
452 	struct sd *sd = (struct sd *) gspca_dev;
453 	u8 i2c_data;
454 	int err;
455 
456 	gspca_dbg(gspca_dev, D_CONF, "Set hvflip %d %d\n",
457 		  sd->hflip->val, sd->vflip->val);
458 	err = m5602_read_sensor(sd, PO1030_CONTROL2, &i2c_data, 1);
459 	if (err < 0)
460 		return err;
461 
462 	i2c_data = (0x3f & i2c_data) | (sd->hflip->val << 7) |
463 		   (sd->vflip->val << 6);
464 
465 	err = m5602_write_sensor(sd, PO1030_CONTROL2,
466 				 &i2c_data, 1);
467 
468 	return err;
469 }
470 
471 static int po1030_set_red_balance(struct gspca_dev *gspca_dev, __s32 val)
472 {
473 	struct sd *sd = (struct sd *) gspca_dev;
474 	u8 i2c_data;
475 	int err;
476 
477 	i2c_data = val & 0xff;
478 	gspca_dbg(gspca_dev, D_CONF, "Set red gain to %d\n", i2c_data);
479 	err = m5602_write_sensor(sd, PO1030_RED_GAIN,
480 				  &i2c_data, 1);
481 	return err;
482 }
483 
484 static int po1030_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val)
485 {
486 	struct sd *sd = (struct sd *) gspca_dev;
487 	u8 i2c_data;
488 	int err;
489 
490 	i2c_data = val & 0xff;
491 	gspca_dbg(gspca_dev, D_CONF, "Set blue gain to %d\n", i2c_data);
492 	err = m5602_write_sensor(sd, PO1030_BLUE_GAIN,
493 				  &i2c_data, 1);
494 
495 	return err;
496 }
497 
498 static int po1030_set_green_balance(struct gspca_dev *gspca_dev, __s32 val)
499 {
500 	struct sd *sd = (struct sd *) gspca_dev;
501 	u8 i2c_data;
502 	int err;
503 
504 	i2c_data = val & 0xff;
505 	gspca_dbg(gspca_dev, D_CONF, "Set green gain to %d\n", i2c_data);
506 
507 	err = m5602_write_sensor(sd, PO1030_GREEN_1_GAIN,
508 			   &i2c_data, 1);
509 	if (err < 0)
510 		return err;
511 
512 	return m5602_write_sensor(sd, PO1030_GREEN_2_GAIN,
513 				 &i2c_data, 1);
514 }
515 
516 static int po1030_set_auto_white_balance(struct gspca_dev *gspca_dev,
517 					 __s32 val)
518 {
519 	struct sd *sd = (struct sd *) gspca_dev;
520 	u8 i2c_data;
521 	int err;
522 
523 	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
524 	if (err < 0)
525 		return err;
526 
527 	gspca_dbg(gspca_dev, D_CONF, "Set auto white balance to %d\n", val);
528 	i2c_data = (i2c_data & 0xfe) | (val & 0x01);
529 	err = m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
530 	return err;
531 }
532 
533 static int po1030_set_auto_exposure(struct gspca_dev *gspca_dev,
534 				    __s32 val)
535 {
536 	struct sd *sd = (struct sd *) gspca_dev;
537 	u8 i2c_data;
538 	int err;
539 
540 	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
541 	if (err < 0)
542 		return err;
543 
544 	gspca_dbg(gspca_dev, D_CONF, "Set auto exposure to %d\n", val);
545 	val = (val == V4L2_EXPOSURE_AUTO);
546 	i2c_data = (i2c_data & 0xfd) | ((val & 0x01) << 1);
547 	return m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
548 }
549 
550 void po1030_disconnect(struct sd *sd)
551 {
552 	sd->sensor = NULL;
553 }
554 
555 static int po1030_s_ctrl(struct v4l2_ctrl *ctrl)
556 {
557 	struct gspca_dev *gspca_dev =
558 		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
559 	struct sd *sd = (struct sd *) gspca_dev;
560 	int err;
561 
562 	if (!gspca_dev->streaming)
563 		return 0;
564 
565 	switch (ctrl->id) {
566 	case V4L2_CID_AUTO_WHITE_BALANCE:
567 		err = po1030_set_auto_white_balance(gspca_dev, ctrl->val);
568 		if (err || ctrl->val)
569 			return err;
570 		err = po1030_set_green_balance(gspca_dev, sd->green_bal->val);
571 		if (err)
572 			return err;
573 		err = po1030_set_red_balance(gspca_dev, sd->red_bal->val);
574 		if (err)
575 			return err;
576 		err = po1030_set_blue_balance(gspca_dev, sd->blue_bal->val);
577 		break;
578 	case V4L2_CID_EXPOSURE_AUTO:
579 		err = po1030_set_auto_exposure(gspca_dev, ctrl->val);
580 		if (err || ctrl->val == V4L2_EXPOSURE_AUTO)
581 			return err;
582 		err = po1030_set_exposure(gspca_dev, sd->expo->val);
583 		break;
584 	case V4L2_CID_GAIN:
585 		err = po1030_set_gain(gspca_dev, ctrl->val);
586 		break;
587 	case V4L2_CID_HFLIP:
588 		err = po1030_set_hvflip(gspca_dev);
589 		break;
590 	default:
591 		return -EINVAL;
592 	}
593 
594 	return err;
595 }
596 
597 static void po1030_dump_registers(struct sd *sd)
598 {
599 	int address;
600 	u8 value = 0;
601 
602 	pr_info("Dumping the po1030 sensor core registers\n");
603 	for (address = 0; address < 0x7f; address++) {
604 		m5602_read_sensor(sd, address, &value, 1);
605 		pr_info("register 0x%x contains 0x%x\n", address, value);
606 	}
607 
608 	pr_info("po1030 register state dump complete\n");
609 
610 	pr_info("Probing for which registers that are read/write\n");
611 	for (address = 0; address < 0xff; address++) {
612 		u8 old_value, ctrl_value;
613 		u8 test_value[2] = {0xff, 0xff};
614 
615 		m5602_read_sensor(sd, address, &old_value, 1);
616 		m5602_write_sensor(sd, address, test_value, 1);
617 		m5602_read_sensor(sd, address, &ctrl_value, 1);
618 
619 		if (ctrl_value == test_value[0])
620 			pr_info("register 0x%x is writeable\n", address);
621 		else
622 			pr_info("register 0x%x is read only\n", address);
623 
624 		/* Restore original value */
625 		m5602_write_sensor(sd, address, &old_value, 1);
626 	}
627 }
628