1 /* Shared Code for OmniVision Camera Chip Drivers
3 * Copyright (c) 2004 Mark McClelland <mark@alpha.dyndns.org>
4 * http://alpha.dyndns.org/ov511/
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.
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/delay.h>
18 #include <linux/i2c.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-i2c-drv.h>
21 #include "ovcamchip_priv.h"
23 #define DRIVER_VERSION "v2.27 for Linux 2.6"
24 #define DRIVER_AUTHOR "Mark McClelland <mark@alpha.dyndns.org>"
25 #define DRIVER_DESC "OV camera chip I2C driver"
27 #define PINFO(fmt, args...) printk(KERN_INFO "ovcamchip: " fmt "\n" , ## args);
28 #define PERROR(fmt, args...) printk(KERN_ERR "ovcamchip: " fmt "\n" , ## args);
31 int ovcamchip_debug = 0;
33 module_param(debug, int, 0);
34 MODULE_PARM_DESC(debug,
35 "Debug level: 0=none, 1=inits, 2=warning, 3=config, 4=functions, 5=all");
38 /* By default, let bridge driver tell us if chip is monochrome. mono=0
39 * will ignore that and always treat chips as color. mono=1 will force
40 * monochrome mode for all chips. */
42 module_param(mono, int, 0);
43 MODULE_PARM_DESC(mono,
44 "1=chips are monochrome (OVx1xx), 0=force color, -1=autodetect (default)");
46 MODULE_AUTHOR(DRIVER_AUTHOR);
47 MODULE_DESCRIPTION(DRIVER_DESC);
48 MODULE_LICENSE("GPL");
51 /* Registers common to all chips, that are needed for detection */
52 #define GENERIC_REG_ID_HIGH 0x1C /* manufacturer ID MSB */
53 #define GENERIC_REG_ID_LOW 0x1D /* manufacturer ID LSB */
54 #define GENERIC_REG_COM_I 0x29 /* misc ID bits */
56 static char *chip_names[NUM_CC_TYPES] = {
57 [CC_UNKNOWN] = "Unknown chip",
58 [CC_OV76BE] = "OV76BE",
59 [CC_OV7610] = "OV7610",
60 [CC_OV7620] = "OV7620",
61 [CC_OV7620AE] = "OV7620AE",
62 [CC_OV6620] = "OV6620",
63 [CC_OV6630] = "OV6630",
64 [CC_OV6630AE] = "OV6630AE",
65 [CC_OV6630AF] = "OV6630AF",
68 /* ----------------------------------------------------------------------- */
70 int ov_write_regvals(struct i2c_client *c, struct ovcamchip_regvals *rvals)
74 while (rvals->reg != 0xff) {
75 rc = ov_write(c, rvals->reg, rvals->val);
84 /* Writes bits at positions specified by mask to an I2C reg. Bits that are in
85 * the same position as 1's in "mask" are cleared and set to "value". Bits
86 * that are in the same position as 0's in "mask" are preserved, regardless
87 * of their respective state in "value".
89 int ov_write_mask(struct i2c_client *c,
95 unsigned char oldval, newval;
100 rc = ov_read(c, reg, &oldval);
104 oldval &= (~mask); /* Clear the masked bits */
105 value &= mask; /* Enforce mask on value */
106 newval = oldval | value; /* Set the desired bits */
109 return ov_write(c, reg, newval);
112 /* ----------------------------------------------------------------------- */
114 /* Reset the chip and ensure that I2C is synchronized. Returns <0 if failure.
116 static int init_camchip(struct i2c_client *c)
119 unsigned char high, low;
122 ov_write(c, 0x12, 0x80);
124 /* Wait for it to initialize */
127 for (i = 0, success = 0; i < I2C_DETECT_RETRIES && !success; i++) {
128 if (ov_read(c, GENERIC_REG_ID_HIGH, &high) >= 0) {
129 if (ov_read(c, GENERIC_REG_ID_LOW, &low) >= 0) {
130 if (high == 0x7F && low == 0xA2) {
138 ov_write(c, 0x12, 0x80);
140 /* Wait for it to initialize */
143 /* Dummy read to sync I2C */
144 ov_read(c, 0x00, &low);
150 PDEBUG(1, "I2C synced in %d attempt(s)", i);
155 /* This detects the OV7610, OV7620, or OV76BE chip. */
156 static int ov7xx0_detect(struct i2c_client *c)
158 struct ovcamchip *ov = i2c_get_clientdata(c);
164 /* Detect chip (sub)type */
165 rc = ov_read(c, GENERIC_REG_COM_I, &val);
167 PERROR("Error detecting ov7xx0 type");
171 if ((val & 3) == 3) {
172 PINFO("Camera chip is an OV7610");
173 ov->subtype = CC_OV7610;
174 } else if ((val & 3) == 1) {
175 rc = ov_read(c, 0x15, &val);
177 PERROR("Error detecting ov7xx0 type");
182 PINFO("Camera chip is an OV7620AE");
183 /* OV7620 is a close enough match for now. There are
184 * some definite differences though, so this should be
186 ov->subtype = CC_OV7620;
188 PINFO("Camera chip is an OV76BE");
189 ov->subtype = CC_OV76BE;
191 } else if ((val & 3) == 0) {
192 PINFO("Camera chip is an OV7620");
193 ov->subtype = CC_OV7620;
195 PERROR("Unknown camera chip version: %d", val & 3);
199 if (ov->subtype == CC_OV76BE)
200 ov->sops = &ov76be_ops;
201 else if (ov->subtype == CC_OV7620)
202 ov->sops = &ov7x20_ops;
204 ov->sops = &ov7x10_ops;
209 /* This detects the OV6620, OV6630, OV6630AE, or OV6630AF chip. */
210 static int ov6xx0_detect(struct i2c_client *c)
212 struct ovcamchip *ov = i2c_get_clientdata(c);
218 /* Detect chip (sub)type */
219 rc = ov_read(c, GENERIC_REG_COM_I, &val);
221 PERROR("Error detecting ov6xx0 type");
225 if ((val & 3) == 0) {
226 ov->subtype = CC_OV6630;
227 PINFO("Camera chip is an OV6630");
228 } else if ((val & 3) == 1) {
229 ov->subtype = CC_OV6620;
230 PINFO("Camera chip is an OV6620");
231 } else if ((val & 3) == 2) {
232 ov->subtype = CC_OV6630;
233 PINFO("Camera chip is an OV6630AE");
234 } else if ((val & 3) == 3) {
235 ov->subtype = CC_OV6630;
236 PINFO("Camera chip is an OV6630AF");
239 if (ov->subtype == CC_OV6620)
240 ov->sops = &ov6x20_ops;
242 ov->sops = &ov6x30_ops;
247 static int ovcamchip_detect(struct i2c_client *c)
249 /* Ideally we would just try a single register write and see if it NAKs.
250 * That isn't possible since the OV518 can't report I2C transaction
251 * failures. So, we have to try to initialize the chip (i.e. reset it
252 * and check the ID registers) to detect its presence. */
255 PDEBUG(3, "Testing for 0V7xx0");
256 if (init_camchip(c) < 0)
258 /* 7-bit addresses with bit 0 set are for the OV7xx0 */
260 if (ov7xx0_detect(c) < 0) {
261 PERROR("Failed to init OV7xx0");
267 PDEBUG(3, "Testing for 0V6xx0");
268 if (ov6xx0_detect(c) < 0) {
269 PERROR("Failed to init OV6xx0");
275 /* ----------------------------------------------------------------------- */
277 static long ovcamchip_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
279 struct ovcamchip *ov = to_ovcamchip(sd);
280 struct i2c_client *c = v4l2_get_subdevdata(sd);
282 if (!ov->initialized &&
283 cmd != OVCAMCHIP_CMD_Q_SUBTYPE &&
284 cmd != OVCAMCHIP_CMD_INITIALIZE) {
285 v4l2_err(sd, "Camera chip not initialized yet!\n");
290 case OVCAMCHIP_CMD_Q_SUBTYPE:
292 *(int *)arg = ov->subtype;
295 case OVCAMCHIP_CMD_INITIALIZE:
300 ov->mono = *(int *)arg;
305 if (ov->subtype != CC_OV7620)
306 v4l2_warn(sd, "Monochrome not "
307 "implemented for this chip\n");
309 v4l2_info(sd, "Initializing chip as "
313 rc = ov->sops->init(c);
321 return ov->sops->command(c, cmd, arg);
325 /* ----------------------------------------------------------------------- */
327 static const struct v4l2_subdev_core_ops ovcamchip_core_ops = {
328 .ioctl = ovcamchip_ioctl,
331 static const struct v4l2_subdev_ops ovcamchip_ops = {
332 .core = &ovcamchip_core_ops,
335 static int ovcamchip_probe(struct i2c_client *client,
336 const struct i2c_device_id *id)
338 struct ovcamchip *ov;
339 struct v4l2_subdev *sd;
342 ov = kzalloc(sizeof *ov, GFP_KERNEL);
348 v4l2_i2c_subdev_init(sd, client, &ovcamchip_ops);
350 rc = ovcamchip_detect(client);
354 v4l_info(client, "%s found @ 0x%02x (%s)\n",
355 chip_names[ov->subtype], client->addr << 1, client->adapter->name);
357 PDEBUG(1, "Camera chip detection complete");
363 PDEBUG(1, "returning %d", rc);
367 static int ovcamchip_remove(struct i2c_client *client)
369 struct v4l2_subdev *sd = i2c_get_clientdata(client);
370 struct ovcamchip *ov = to_ovcamchip(sd);
373 v4l2_device_unregister_subdev(sd);
374 rc = ov->sops->free(client);
382 /* ----------------------------------------------------------------------- */
384 static const struct i2c_device_id ovcamchip_id[] = {
388 MODULE_DEVICE_TABLE(i2c, ovcamchip_id);
390 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
392 .probe = ovcamchip_probe,
393 .remove = ovcamchip_remove,
394 .id_table = ovcamchip_id,