1 /*
2  * Support for the sensor part which is integrated (I think) into the
3  * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
4  * but instead direct bridge writes.
5  *
6  * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
7  *
8  * Strongly based on qc-usb-messenger, which is:
9  * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
10  *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
11  * Copyright (c) 2002, 2003 Tuukka Toivonen
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  */
24 
25 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
26 
27 #include "stv06xx_st6422.h"
28 
29 static struct v4l2_pix_format st6422_mode[] = {
30 	/* Note we actually get 124 lines of data, of which we skip the 4st
31 	   4 as they are garbage */
32 	{
33 		162,
34 		120,
35 		V4L2_PIX_FMT_SGRBG8,
36 		V4L2_FIELD_NONE,
37 		.sizeimage = 162 * 120,
38 		.bytesperline = 162,
39 		.colorspace = V4L2_COLORSPACE_SRGB,
40 		.priv = 1
41 	},
42 	/* Note we actually get 248 lines of data, of which we skip the 4st
43 	   4 as they are garbage, and we tell the app it only gets the
44 	   first 240 of the 244 lines it actually gets, so that it ignores
45 	   the last 4. */
46 	{
47 		324,
48 		240,
49 		V4L2_PIX_FMT_SGRBG8,
50 		V4L2_FIELD_NONE,
51 		.sizeimage = 324 * 244,
52 		.bytesperline = 324,
53 		.colorspace = V4L2_COLORSPACE_SRGB,
54 		.priv = 0
55 	},
56 };
57 
58 /* V4L2 controls supported by the driver */
59 static int setbrightness(struct sd *sd, s32 val);
60 static int setcontrast(struct sd *sd, s32 val);
61 static int setgain(struct sd *sd, u8 gain);
62 static int setexposure(struct sd *sd, s16 expo);
63 
64 static int st6422_s_ctrl(struct v4l2_ctrl *ctrl)
65 {
66 	struct gspca_dev *gspca_dev =
67 		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
68 	struct sd *sd = (struct sd *)gspca_dev;
69 	int err = -EINVAL;
70 
71 	switch (ctrl->id) {
72 	case V4L2_CID_BRIGHTNESS:
73 		err = setbrightness(sd, ctrl->val);
74 		break;
75 	case V4L2_CID_CONTRAST:
76 		err = setcontrast(sd, ctrl->val);
77 		break;
78 	case V4L2_CID_GAIN:
79 		err = setgain(sd, ctrl->val);
80 		break;
81 	case V4L2_CID_EXPOSURE:
82 		err = setexposure(sd, ctrl->val);
83 		break;
84 	}
85 
86 	/* commit settings */
87 	if (err >= 0)
88 		err = stv06xx_write_bridge(sd, 0x143f, 0x01);
89 	sd->gspca_dev.usb_err = err;
90 	return err;
91 }
92 
93 static const struct v4l2_ctrl_ops st6422_ctrl_ops = {
94 	.s_ctrl = st6422_s_ctrl,
95 };
96 
97 static int st6422_init_controls(struct sd *sd)
98 {
99 	struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
100 
101 	v4l2_ctrl_handler_init(hdl, 4);
102 	v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
103 			V4L2_CID_BRIGHTNESS, 0, 31, 1, 3);
104 	v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
105 			V4L2_CID_CONTRAST, 0, 15, 1, 11);
106 	v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
107 			V4L2_CID_EXPOSURE, 0, 1023, 1, 256);
108 	v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
109 			V4L2_CID_GAIN, 0, 255, 1, 64);
110 
111 	return hdl->error;
112 }
113 
114 static int st6422_probe(struct sd *sd)
115 {
116 	if (sd->bridge != BRIDGE_ST6422)
117 		return -ENODEV;
118 
119 	pr_info("st6422 sensor detected\n");
120 
121 	sd->gspca_dev.cam.cam_mode = st6422_mode;
122 	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(st6422_mode);
123 	return 0;
124 }
125 
126 static int st6422_init(struct sd *sd)
127 {
128 	int err = 0, i;
129 
130 	const u16 st6422_bridge_init[][2] = {
131 		{ STV_ISO_ENABLE, 0x00 }, /* disable capture */
132 		{ 0x1436, 0x00 },
133 		{ 0x1432, 0x03 },	/* 0x00-0x1F brightness */
134 		{ 0x143a, 0xf9 },	/* 0x00-0x0F contrast */
135 		{ 0x0509, 0x38 },	/* R */
136 		{ 0x050a, 0x38 },	/* G */
137 		{ 0x050b, 0x38 },	/* B */
138 		{ 0x050c, 0x2a },
139 		{ 0x050d, 0x01 },
140 
141 
142 		{ 0x1431, 0x00 },	/* 0x00-0x07 ??? */
143 		{ 0x1433, 0x34 },	/* 160x120, 0x00-0x01 night filter */
144 		{ 0x1438, 0x18 },	/* 640x480 */
145 /* 18 bayes */
146 /* 10 compressed? */
147 
148 		{ 0x1439, 0x00 },
149 /* anti-noise?  0xa2 gives a perfect image */
150 
151 		{ 0x143b, 0x05 },
152 		{ 0x143c, 0x00 },	/* 0x00-0x01 - ??? */
153 
154 
155 /* shutter time 0x0000-0x03FF */
156 /* low value  give good picures on moving objects (but requires much light) */
157 /* high value gives good picures in darkness (but tends to be overexposed) */
158 		{ 0x143e, 0x01 },
159 		{ 0x143d, 0x00 },
160 
161 		{ 0x1442, 0xe2 },
162 /* write: 1x1x xxxx */
163 /* read:  1x1x xxxx */
164 /*        bit 5 == button pressed and hold if 0 */
165 /* write 0xe2,0xea */
166 
167 /* 0x144a */
168 /* 0x00 init */
169 /* bit 7 == button has been pressed, but not handled */
170 
171 /* interrupt */
172 /* if(urb->iso_frame_desc[i].status == 0x80) { */
173 /* if(urb->iso_frame_desc[i].status == 0x88) { */
174 
175 		{ 0x1500, 0xd0 },
176 		{ 0x1500, 0xd0 },
177 		{ 0x1500, 0x50 },	/* 0x00 - 0xFF  0x80 == compr ? */
178 
179 		{ 0x1501, 0xaf },
180 /* high val-> light area gets darker */
181 /* low val -> light area gets lighter */
182 		{ 0x1502, 0xc2 },
183 /* high val-> light area gets darker */
184 /* low val -> light area gets lighter */
185 		{ 0x1503, 0x45 },
186 /* high val-> light area gets darker */
187 /* low val -> light area gets lighter */
188 		{ 0x1505, 0x02 },
189 /* 2  : 324x248  80352 bytes */
190 /* 7  : 248x162  40176 bytes */
191 /* c+f: 162*124  20088 bytes */
192 
193 		{ 0x150e, 0x8e },
194 		{ 0x150f, 0x37 },
195 		{ 0x15c0, 0x00 },
196 		{ 0x15c3, 0x08 },	/* 0x04/0x14 ... test pictures ??? */
197 
198 
199 		{ 0x143f, 0x01 },	/* commit settings */
200 
201 	};
202 
203 	for (i = 0; i < ARRAY_SIZE(st6422_bridge_init) && !err; i++) {
204 		err = stv06xx_write_bridge(sd, st6422_bridge_init[i][0],
205 					       st6422_bridge_init[i][1]);
206 	}
207 
208 	return err;
209 }
210 
211 static int setbrightness(struct sd *sd, s32 val)
212 {
213 	/* val goes from 0 -> 31 */
214 	return stv06xx_write_bridge(sd, 0x1432, val);
215 }
216 
217 static int setcontrast(struct sd *sd, s32 val)
218 {
219 	/* Val goes from 0 -> 15 */
220 	return stv06xx_write_bridge(sd, 0x143a, val | 0xf0);
221 }
222 
223 static int setgain(struct sd *sd, u8 gain)
224 {
225 	int err;
226 
227 	/* Set red, green, blue, gain */
228 	err = stv06xx_write_bridge(sd, 0x0509, gain);
229 	if (err < 0)
230 		return err;
231 
232 	err = stv06xx_write_bridge(sd, 0x050a, gain);
233 	if (err < 0)
234 		return err;
235 
236 	err = stv06xx_write_bridge(sd, 0x050b, gain);
237 	if (err < 0)
238 		return err;
239 
240 	/* 2 mystery writes */
241 	err = stv06xx_write_bridge(sd, 0x050c, 0x2a);
242 	if (err < 0)
243 		return err;
244 
245 	return stv06xx_write_bridge(sd, 0x050d, 0x01);
246 }
247 
248 static int setexposure(struct sd *sd, s16 expo)
249 {
250 	int err;
251 
252 	err = stv06xx_write_bridge(sd, 0x143d, expo & 0xff);
253 	if (err < 0)
254 		return err;
255 
256 	return stv06xx_write_bridge(sd, 0x143e, expo >> 8);
257 }
258 
259 static int st6422_start(struct sd *sd)
260 {
261 	int err;
262 	struct cam *cam = &sd->gspca_dev.cam;
263 
264 	if (cam->cam_mode[sd->gspca_dev.curr_mode].priv)
265 		err = stv06xx_write_bridge(sd, 0x1505, 0x0f);
266 	else
267 		err = stv06xx_write_bridge(sd, 0x1505, 0x02);
268 	if (err < 0)
269 		return err;
270 
271 	/* commit settings */
272 	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
273 	return (err < 0) ? err : 0;
274 }
275 
276 static int st6422_stop(struct sd *sd)
277 {
278 	struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
279 
280 	gspca_dbg(gspca_dev, D_STREAM, "Halting stream\n");
281 
282 	return 0;
283 }
284