1 /* OmniVision OV6630/OV6130 Camera Chip Support Code
2 *
3 * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
4 * http://alpha.dyndns.org/ov511/
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
10 */
11
12 #define DEBUG
13
14 #include <linux/slab.h>
15 #include "ovcamchip_priv.h"
16
17 /* Registers */
18 #define REG_GAIN 0x00 /* gain [5:0] */
19 #define REG_BLUE 0x01 /* blue gain */
20 #define REG_RED 0x02 /* red gain */
21 #define REG_SAT 0x03 /* saturation [7:3] */
22 #define REG_CNT 0x05 /* Y contrast [3:0] */
23 #define REG_BRT 0x06 /* Y brightness */
24 #define REG_SHARP 0x07 /* sharpness */
25 #define REG_WB_BLUE 0x0C /* WB blue ratio [5:0] */
26 #define REG_WB_RED 0x0D /* WB red ratio [5:0] */
27 #define REG_EXP 0x10 /* exposure */
28
29 /* Window parameters */
30 #define HWSBASE 0x38
31 #define HWEBASE 0x3A
32 #define VWSBASE 0x05
33 #define VWEBASE 0x06
34
35 struct ov6x30 {
36 int auto_brt;
37 int auto_exp;
38 int backlight;
39 int bandfilt;
40 int mirror;
41 };
42
43 static struct ovcamchip_regvals regvals_init_6x30[] = {
44 { 0x12, 0x80 }, /* reset */
45 { 0x00, 0x1f }, /* Gain */
46 { 0x01, 0x99 }, /* Blue gain */
47 { 0x02, 0x7c }, /* Red gain */
48 { 0x03, 0xc0 }, /* Saturation */
49 { 0x05, 0x0a }, /* Contrast */
50 { 0x06, 0x95 }, /* Brightness */
51 { 0x07, 0x2d }, /* Sharpness */
52 { 0x0c, 0x20 },
53 { 0x0d, 0x20 },
54 { 0x0e, 0x20 },
55 { 0x0f, 0x05 },
56 { 0x10, 0x9a }, /* "exposure check" */
57 { 0x11, 0x00 }, /* Pixel clock = fastest */
58 { 0x12, 0x24 }, /* Enable AGC and AWB */
59 { 0x13, 0x21 },
60 { 0x14, 0x80 },
61 { 0x15, 0x01 },
62 { 0x16, 0x03 },
63 { 0x17, 0x38 },
64 { 0x18, 0xea },
65 { 0x19, 0x04 },
66 { 0x1a, 0x93 },
67 { 0x1b, 0x00 },
68 { 0x1e, 0xc4 },
69 { 0x1f, 0x04 },
70 { 0x20, 0x20 },
71 { 0x21, 0x10 },
72 { 0x22, 0x88 },
73 { 0x23, 0xc0 }, /* Crystal circuit power level */
74 { 0x25, 0x9a }, /* Increase AEC black pixel ratio */
75 { 0x26, 0xb2 }, /* BLC enable */
76 { 0x27, 0xa2 },
77 { 0x28, 0x00 },
78 { 0x29, 0x00 },
79 { 0x2a, 0x84 }, /* (keep) */
80 { 0x2b, 0xa8 }, /* (keep) */
81 { 0x2c, 0xa0 },
82 { 0x2d, 0x95 }, /* Enable auto-brightness */
83 { 0x2e, 0x88 },
84 { 0x33, 0x26 },
85 { 0x34, 0x03 },
86 { 0x36, 0x8f },
87 { 0x37, 0x80 },
88 { 0x38, 0x83 },
89 { 0x39, 0x80 },
90 { 0x3a, 0x0f },
91 { 0x3b, 0x3c },
92 { 0x3c, 0x1a },
93 { 0x3d, 0x80 },
94 { 0x3e, 0x80 },
95 { 0x3f, 0x0e },
96 { 0x40, 0x00 }, /* White bal */
97 { 0x41, 0x00 }, /* White bal */
98 { 0x42, 0x80 },
99 { 0x43, 0x3f }, /* White bal */
100 { 0x44, 0x80 },
101 { 0x45, 0x20 },
102 { 0x46, 0x20 },
103 { 0x47, 0x80 },
104 { 0x48, 0x7f },
105 { 0x49, 0x00 },
106 { 0x4a, 0x00 },
107 { 0x4b, 0x80 },
108 { 0x4c, 0xd0 },
109 { 0x4d, 0x10 }, /* U = 0.563u, V = 0.714v */
110 { 0x4e, 0x40 },
111 { 0x4f, 0x07 }, /* UV average mode, color killer: strongest */
112 { 0x50, 0xff },
113 { 0x54, 0x23 }, /* Max AGC gain: 18dB */
114 { 0x55, 0xff },
115 { 0x56, 0x12 },
116 { 0x57, 0x81 }, /* (default) */
117 { 0x58, 0x75 },
118 { 0x59, 0x01 }, /* AGC dark current compensation: +1 */
119 { 0x5a, 0x2c },
120 { 0x5b, 0x0f }, /* AWB chrominance levels */
121 { 0x5c, 0x10 },
122 { 0x3d, 0x80 },
123 { 0x27, 0xa6 },
124 /* Toggle AWB off and on */
125 { 0x12, 0x20 },
126 { 0x12, 0x24 },
127
128 { 0xff, 0xff }, /* END MARKER */
129 };
130
131 /* This initializes the OV6x30 camera chip and relevant variables. */
ov6x30_init(struct i2c_client * c)132 static int ov6x30_init(struct i2c_client *c)
133 {
134 struct ovcamchip *ov = i2c_get_clientdata(c);
135 struct ov6x30 *s;
136 int rc;
137
138 DDEBUG(4, &c->dev, "entered");
139
140 rc = ov_write_regvals(c, regvals_init_6x30);
141 if (rc < 0)
142 return rc;
143
144 ov->spriv = s = kzalloc(sizeof *s, GFP_KERNEL);
145 if (!s)
146 return -ENOMEM;
147
148 s->auto_brt = 1;
149 s->auto_exp = 1;
150
151 return rc;
152 }
153
ov6x30_free(struct i2c_client * c)154 static int ov6x30_free(struct i2c_client *c)
155 {
156 struct ovcamchip *ov = i2c_get_clientdata(c);
157
158 kfree(ov->spriv);
159 return 0;
160 }
161
ov6x30_set_control(struct i2c_client * c,struct ovcamchip_control * ctl)162 static int ov6x30_set_control(struct i2c_client *c,
163 struct ovcamchip_control *ctl)
164 {
165 struct ovcamchip *ov = i2c_get_clientdata(c);
166 struct ov6x30 *s = ov->spriv;
167 int rc;
168 int v = ctl->value;
169
170 switch (ctl->id) {
171 case OVCAMCHIP_CID_CONT:
172 rc = ov_write_mask(c, REG_CNT, v >> 12, 0x0f);
173 break;
174 case OVCAMCHIP_CID_BRIGHT:
175 rc = ov_write(c, REG_BRT, v >> 8);
176 break;
177 case OVCAMCHIP_CID_SAT:
178 rc = ov_write(c, REG_SAT, v >> 8);
179 break;
180 case OVCAMCHIP_CID_HUE:
181 rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
182 if (rc < 0)
183 goto out;
184
185 rc = ov_write(c, REG_BLUE, v >> 8);
186 break;
187 case OVCAMCHIP_CID_EXP:
188 rc = ov_write(c, REG_EXP, v);
189 break;
190 case OVCAMCHIP_CID_FREQ:
191 {
192 int sixty = (v == 60);
193
194 rc = ov_write(c, 0x2b, sixty?0xa8:0x28);
195 if (rc < 0)
196 goto out;
197
198 rc = ov_write(c, 0x2a, sixty?0x84:0xa4);
199 break;
200 }
201 case OVCAMCHIP_CID_BANDFILT:
202 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
203 s->bandfilt = v;
204 break;
205 case OVCAMCHIP_CID_AUTOBRIGHT:
206 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
207 s->auto_brt = v;
208 break;
209 case OVCAMCHIP_CID_AUTOEXP:
210 rc = ov_write_mask(c, 0x28, v?0x00:0x10, 0x10);
211 s->auto_exp = v;
212 break;
213 case OVCAMCHIP_CID_BACKLIGHT:
214 {
215 rc = ov_write_mask(c, 0x4e, v?0x80:0x60, 0xe0);
216 if (rc < 0)
217 goto out;
218
219 rc = ov_write_mask(c, 0x29, v?0x08:0x00, 0x08);
220 if (rc < 0)
221 goto out;
222
223 rc = ov_write_mask(c, 0x28, v?0x02:0x00, 0x02);
224 s->backlight = v;
225 break;
226 }
227 case OVCAMCHIP_CID_MIRROR:
228 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
229 s->mirror = v;
230 break;
231 default:
232 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
233 return -EPERM;
234 }
235
236 out:
237 DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
238 return rc;
239 }
240
ov6x30_get_control(struct i2c_client * c,struct ovcamchip_control * ctl)241 static int ov6x30_get_control(struct i2c_client *c,
242 struct ovcamchip_control *ctl)
243 {
244 struct ovcamchip *ov = i2c_get_clientdata(c);
245 struct ov6x30 *s = ov->spriv;
246 int rc = 0;
247 unsigned char val = 0;
248
249 switch (ctl->id) {
250 case OVCAMCHIP_CID_CONT:
251 rc = ov_read(c, REG_CNT, &val);
252 ctl->value = (val & 0x0f) << 12;
253 break;
254 case OVCAMCHIP_CID_BRIGHT:
255 rc = ov_read(c, REG_BRT, &val);
256 ctl->value = val << 8;
257 break;
258 case OVCAMCHIP_CID_SAT:
259 rc = ov_read(c, REG_SAT, &val);
260 ctl->value = val << 8;
261 break;
262 case OVCAMCHIP_CID_HUE:
263 rc = ov_read(c, REG_BLUE, &val);
264 ctl->value = val << 8;
265 break;
266 case OVCAMCHIP_CID_EXP:
267 rc = ov_read(c, REG_EXP, &val);
268 ctl->value = val;
269 break;
270 case OVCAMCHIP_CID_BANDFILT:
271 ctl->value = s->bandfilt;
272 break;
273 case OVCAMCHIP_CID_AUTOBRIGHT:
274 ctl->value = s->auto_brt;
275 break;
276 case OVCAMCHIP_CID_AUTOEXP:
277 ctl->value = s->auto_exp;
278 break;
279 case OVCAMCHIP_CID_BACKLIGHT:
280 ctl->value = s->backlight;
281 break;
282 case OVCAMCHIP_CID_MIRROR:
283 ctl->value = s->mirror;
284 break;
285 default:
286 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
287 return -EPERM;
288 }
289
290 DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
291 return rc;
292 }
293
ov6x30_mode_init(struct i2c_client * c,struct ovcamchip_window * win)294 static int ov6x30_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
295 {
296 /******** QCIF-specific regs ********/
297
298 ov_write_mask(c, 0x14, win->quarter?0x20:0x00, 0x20);
299
300 /******** Palette-specific regs ********/
301
302 if (win->format == VIDEO_PALETTE_GREY) {
303 if (c->adapter->id == I2C_HW_SMBUS_OV518) {
304 /* Do nothing - we're already in 8-bit mode */
305 } else {
306 ov_write_mask(c, 0x13, 0x20, 0x20);
307 }
308 } else {
309 /* The OV518 needs special treatment. Although both the OV518
310 * and the OV6630 support a 16-bit video bus, only the 8 bit Y
311 * bus is actually used. The UV bus is tied to ground.
312 * Therefore, the OV6630 needs to be in 8-bit multiplexed
313 * output mode */
314
315 if (c->adapter->id == I2C_HW_SMBUS_OV518) {
316 /* Do nothing - we want to stay in 8-bit mode */
317 /* Warning: Messing with reg 0x13 breaks OV518 color */
318 } else {
319 ov_write_mask(c, 0x13, 0x00, 0x20);
320 }
321 }
322
323 /******** Clock programming ********/
324
325 ov_write(c, 0x11, win->clockdiv);
326
327 return 0;
328 }
329
ov6x30_set_window(struct i2c_client * c,struct ovcamchip_window * win)330 static int ov6x30_set_window(struct i2c_client *c, struct ovcamchip_window *win)
331 {
332 int ret, hwscale, vwscale;
333
334 ret = ov6x30_mode_init(c, win);
335 if (ret < 0)
336 return ret;
337
338 if (win->quarter) {
339 hwscale = 0;
340 vwscale = 0;
341 } else {
342 hwscale = 1;
343 vwscale = 1; /* The datasheet says 0; it's wrong */
344 }
345
346 ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
347 ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
348 ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
349 ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
350
351 return 0;
352 }
353
ov6x30_command(struct i2c_client * c,unsigned int cmd,void * arg)354 static int ov6x30_command(struct i2c_client *c, unsigned int cmd, void *arg)
355 {
356 switch (cmd) {
357 case OVCAMCHIP_CMD_S_CTRL:
358 return ov6x30_set_control(c, arg);
359 case OVCAMCHIP_CMD_G_CTRL:
360 return ov6x30_get_control(c, arg);
361 case OVCAMCHIP_CMD_S_MODE:
362 return ov6x30_set_window(c, arg);
363 default:
364 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
365 return -ENOIOCTLCMD;
366 }
367 }
368
369 struct ovcamchip_ops ov6x30_ops = {
370 .init = ov6x30_init,
371 .free = ov6x30_free,
372 .command = ov6x30_command,
373 };
374