1 /* OmniVision OV7610/OV7110 Camera Chip Support Code
2 *
3 * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
4 * http://alpha.dyndns.org/ov511/
5 *
6 * Color fixes by by Orion Sky Lawlor <olawlor@acm.org> (2/26/2000)
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
12 */
13
14 #define DEBUG
15
16 #include <linux/slab.h>
17 #include "ovcamchip_priv.h"
18
19 /* Registers */
20 #define REG_GAIN 0x00 /* gain [5:0] */
21 #define REG_BLUE 0x01 /* blue channel balance */
22 #define REG_RED 0x02 /* red channel balance */
23 #define REG_SAT 0x03 /* saturation */
24 #define REG_CNT 0x05 /* Y contrast */
25 #define REG_BRT 0x06 /* Y brightness */
26 #define REG_BLUE_BIAS 0x0C /* blue channel bias [5:0] */
27 #define REG_RED_BIAS 0x0D /* red channel bias [5:0] */
28 #define REG_GAMMA_COEFF 0x0E /* gamma settings */
29 #define REG_WB_RANGE 0x0F /* AEC/ALC/S-AWB settings */
30 #define REG_EXP 0x10 /* manual exposure setting */
31 #define REG_CLOCK 0x11 /* polarity/clock prescaler */
32 #define REG_FIELD_DIVIDE 0x16 /* field interval/mode settings */
33 #define REG_HWIN_START 0x17 /* horizontal window start */
34 #define REG_HWIN_END 0x18 /* horizontal window end */
35 #define REG_VWIN_START 0x19 /* vertical window start */
36 #define REG_VWIN_END 0x1A /* vertical window end */
37 #define REG_PIXEL_SHIFT 0x1B /* pixel shift */
38 #define REG_YOFFSET 0x21 /* Y channel offset */
39 #define REG_UOFFSET 0x22 /* U channel offset */
40 #define REG_ECW 0x24 /* exposure white level for AEC */
41 #define REG_ECB 0x25 /* exposure black level for AEC */
42 #define REG_FRAMERATE_H 0x2A /* frame rate MSB + misc */
43 #define REG_FRAMERATE_L 0x2B /* frame rate LSB */
44 #define REG_ALC 0x2C /* Auto Level Control settings */
45 #define REG_VOFFSET 0x2E /* V channel offset adjustment */
46 #define REG_ARRAY_BIAS 0x2F /* array bias -- don't change */
47 #define REG_YGAMMA 0x33 /* misc gamma settings [7:6] */
48 #define REG_BIAS_ADJUST 0x34 /* misc bias settings */
49
50 /* Window parameters */
51 #define HWSBASE 0x38
52 #define HWEBASE 0x3a
53 #define VWSBASE 0x05
54 #define VWEBASE 0x05
55
56 struct ov7x10 {
57 int auto_brt;
58 int auto_exp;
59 int bandfilt;
60 int mirror;
61 };
62
63 /* Lawrence Glaister <lg@jfm.bc.ca> reports:
64 *
65 * Register 0x0f in the 7610 has the following effects:
66 *
67 * 0x85 (AEC method 1): Best overall, good contrast range
68 * 0x45 (AEC method 2): Very overexposed
69 * 0xa5 (spec sheet default): Ok, but the black level is
70 * shifted resulting in loss of contrast
71 * 0x05 (old driver setting): very overexposed, too much
72 * contrast
73 */
74 static struct ovcamchip_regvals regvals_init_7x10[] = {
75 { 0x10, 0xff },
76 { 0x16, 0x03 },
77 { 0x28, 0x24 },
78 { 0x2b, 0xac },
79 { 0x12, 0x00 },
80 { 0x38, 0x81 },
81 { 0x28, 0x24 }, /* 0c */
82 { 0x0f, 0x85 }, /* lg's setting */
83 { 0x15, 0x01 },
84 { 0x20, 0x1c },
85 { 0x23, 0x2a },
86 { 0x24, 0x10 },
87 { 0x25, 0x8a },
88 { 0x26, 0xa2 },
89 { 0x27, 0xc2 },
90 { 0x2a, 0x04 },
91 { 0x2c, 0xfe },
92 { 0x2d, 0x93 },
93 { 0x30, 0x71 },
94 { 0x31, 0x60 },
95 { 0x32, 0x26 },
96 { 0x33, 0x20 },
97 { 0x34, 0x48 },
98 { 0x12, 0x24 },
99 { 0x11, 0x01 },
100 { 0x0c, 0x24 },
101 { 0x0d, 0x24 },
102 { 0xff, 0xff }, /* END MARKER */
103 };
104
105 /* This initializes the OV7x10 camera chip and relevant variables. */
ov7x10_init(struct i2c_client * c)106 static int ov7x10_init(struct i2c_client *c)
107 {
108 struct ovcamchip *ov = i2c_get_clientdata(c);
109 struct ov7x10 *s;
110 int rc;
111
112 DDEBUG(4, &c->dev, "entered");
113
114 rc = ov_write_regvals(c, regvals_init_7x10);
115 if (rc < 0)
116 return rc;
117
118 ov->spriv = s = kzalloc(sizeof *s, GFP_KERNEL);
119 if (!s)
120 return -ENOMEM;
121
122 s->auto_brt = 1;
123 s->auto_exp = 1;
124
125 return rc;
126 }
127
ov7x10_free(struct i2c_client * c)128 static int ov7x10_free(struct i2c_client *c)
129 {
130 struct ovcamchip *ov = i2c_get_clientdata(c);
131
132 kfree(ov->spriv);
133 return 0;
134 }
135
ov7x10_set_control(struct i2c_client * c,struct ovcamchip_control * ctl)136 static int ov7x10_set_control(struct i2c_client *c,
137 struct ovcamchip_control *ctl)
138 {
139 struct ovcamchip *ov = i2c_get_clientdata(c);
140 struct ov7x10 *s = ov->spriv;
141 int rc;
142 int v = ctl->value;
143
144 switch (ctl->id) {
145 case OVCAMCHIP_CID_CONT:
146 rc = ov_write(c, REG_CNT, v >> 8);
147 break;
148 case OVCAMCHIP_CID_BRIGHT:
149 rc = ov_write(c, REG_BRT, v >> 8);
150 break;
151 case OVCAMCHIP_CID_SAT:
152 rc = ov_write(c, REG_SAT, v >> 8);
153 break;
154 case OVCAMCHIP_CID_HUE:
155 rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
156 if (rc < 0)
157 goto out;
158
159 rc = ov_write(c, REG_BLUE, v >> 8);
160 break;
161 case OVCAMCHIP_CID_EXP:
162 rc = ov_write(c, REG_EXP, v);
163 break;
164 case OVCAMCHIP_CID_FREQ:
165 {
166 int sixty = (v == 60);
167
168 rc = ov_write_mask(c, 0x2a, sixty?0x00:0x80, 0x80);
169 if (rc < 0)
170 goto out;
171
172 rc = ov_write(c, 0x2b, sixty?0x00:0xac);
173 if (rc < 0)
174 goto out;
175
176 rc = ov_write_mask(c, 0x13, 0x10, 0x10);
177 if (rc < 0)
178 goto out;
179
180 rc = ov_write_mask(c, 0x13, 0x00, 0x10);
181 break;
182 }
183 case OVCAMCHIP_CID_BANDFILT:
184 rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
185 s->bandfilt = v;
186 break;
187 case OVCAMCHIP_CID_AUTOBRIGHT:
188 rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
189 s->auto_brt = v;
190 break;
191 case OVCAMCHIP_CID_AUTOEXP:
192 rc = ov_write_mask(c, 0x29, v?0x00:0x80, 0x80);
193 s->auto_exp = v;
194 break;
195 case OVCAMCHIP_CID_MIRROR:
196 rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
197 s->mirror = v;
198 break;
199 default:
200 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
201 return -EPERM;
202 }
203
204 out:
205 DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
206 return rc;
207 }
208
ov7x10_get_control(struct i2c_client * c,struct ovcamchip_control * ctl)209 static int ov7x10_get_control(struct i2c_client *c,
210 struct ovcamchip_control *ctl)
211 {
212 struct ovcamchip *ov = i2c_get_clientdata(c);
213 struct ov7x10 *s = ov->spriv;
214 int rc = 0;
215 unsigned char val = 0;
216
217 switch (ctl->id) {
218 case OVCAMCHIP_CID_CONT:
219 rc = ov_read(c, REG_CNT, &val);
220 ctl->value = val << 8;
221 break;
222 case OVCAMCHIP_CID_BRIGHT:
223 rc = ov_read(c, REG_BRT, &val);
224 ctl->value = val << 8;
225 break;
226 case OVCAMCHIP_CID_SAT:
227 rc = ov_read(c, REG_SAT, &val);
228 ctl->value = val << 8;
229 break;
230 case OVCAMCHIP_CID_HUE:
231 rc = ov_read(c, REG_BLUE, &val);
232 ctl->value = val << 8;
233 break;
234 case OVCAMCHIP_CID_EXP:
235 rc = ov_read(c, REG_EXP, &val);
236 ctl->value = val;
237 break;
238 case OVCAMCHIP_CID_BANDFILT:
239 ctl->value = s->bandfilt;
240 break;
241 case OVCAMCHIP_CID_AUTOBRIGHT:
242 ctl->value = s->auto_brt;
243 break;
244 case OVCAMCHIP_CID_AUTOEXP:
245 ctl->value = s->auto_exp;
246 break;
247 case OVCAMCHIP_CID_MIRROR:
248 ctl->value = s->mirror;
249 break;
250 default:
251 DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
252 return -EPERM;
253 }
254
255 DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
256 return rc;
257 }
258
ov7x10_mode_init(struct i2c_client * c,struct ovcamchip_window * win)259 static int ov7x10_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
260 {
261 int qvga = win->quarter;
262
263 /******** QVGA-specific regs ********/
264
265 ov_write(c, 0x14, qvga?0x24:0x04);
266
267 /******** Palette-specific regs ********/
268
269 if (win->format == VIDEO_PALETTE_GREY) {
270 ov_write_mask(c, 0x0e, 0x40, 0x40);
271 ov_write_mask(c, 0x13, 0x20, 0x20);
272 } else {
273 ov_write_mask(c, 0x0e, 0x00, 0x40);
274 ov_write_mask(c, 0x13, 0x00, 0x20);
275 }
276
277 /******** Clock programming ********/
278
279 ov_write(c, 0x11, win->clockdiv);
280
281 /******** Resolution-specific ********/
282
283 if (win->width == 640 && win->height == 480)
284 ov_write(c, 0x35, 0x9e);
285 else
286 ov_write(c, 0x35, 0x1e);
287
288 return 0;
289 }
290
ov7x10_set_window(struct i2c_client * c,struct ovcamchip_window * win)291 static int ov7x10_set_window(struct i2c_client *c, struct ovcamchip_window *win)
292 {
293 int ret, hwscale, vwscale;
294
295 ret = ov7x10_mode_init(c, win);
296 if (ret < 0)
297 return ret;
298
299 if (win->quarter) {
300 hwscale = 1;
301 vwscale = 0;
302 } else {
303 hwscale = 2;
304 vwscale = 1;
305 }
306
307 ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
308 ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
309 ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
310 ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));
311
312 return 0;
313 }
314
ov7x10_command(struct i2c_client * c,unsigned int cmd,void * arg)315 static int ov7x10_command(struct i2c_client *c, unsigned int cmd, void *arg)
316 {
317 switch (cmd) {
318 case OVCAMCHIP_CMD_S_CTRL:
319 return ov7x10_set_control(c, arg);
320 case OVCAMCHIP_CMD_G_CTRL:
321 return ov7x10_get_control(c, arg);
322 case OVCAMCHIP_CMD_S_MODE:
323 return ov7x10_set_window(c, arg);
324 default:
325 DDEBUG(2, &c->dev, "command not supported: %d", cmd);
326 return -ENOIOCTLCMD;
327 }
328 }
329
330 struct ovcamchip_ops ov7x10_ops = {
331 .init = ov7x10_init,
332 .free = ov7x10_free,
333 .command = ov7x10_command,
334 };
335