Commit | Line | Data |
---|---|---|
f2242ee5 | 1 | /* |
1ff16c20 | 2 | * usbvision_i2c.c |
781aa1d1 MCC |
3 | * i2c algorithm for USB-I2C Bridges |
4 | * | |
1ff16c20 | 5 | * Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de> |
781aa1d1 MCC |
6 | * Dwaine Garden <dwainegarden@rogers.com> |
7 | * | |
8 | * This module is part of usbvision driver project. | |
9 | * Updates to driver completed by Dwaine P. Garden | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/slab.h> | |
a1ed551c | 31 | #include <linux/utsname.h> |
781aa1d1 MCC |
32 | #include <linux/init.h> |
33 | #include <asm/uaccess.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/errno.h> | |
781aa1d1 MCC |
36 | #include <linux/usb.h> |
37 | #include <linux/i2c.h> | |
483dfdb6 | 38 | #include "usbvision.h" |
781aa1d1 | 39 | |
483dfdb6 | 40 | #define DBG_I2C 1<<0 |
781aa1d1 | 41 | |
ff699e6b | 42 | static int i2c_debug; |
483dfdb6 TM |
43 | |
44 | module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver | |
45 | MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); | |
781aa1d1 | 46 | |
df18c319 TM |
47 | #define PDEBUG(level, fmt, args...) { \ |
48 | if (i2c_debug & (level)) \ | |
a482f327 GKH |
49 | printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \ |
50 | __func__, __LINE__ , ## args); \ | |
df18c319 | 51 | } |
781aa1d1 | 52 | |
1ff16c20 | 53 | static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
2a7e9a26 | 54 | short len); |
1ff16c20 | 55 | static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
2a7e9a26 MCC |
56 | short len); |
57 | ||
781aa1d1 MCC |
58 | static inline int try_write_address(struct i2c_adapter *i2c_adap, |
59 | unsigned char addr, int retries) | |
60 | { | |
1ff16c20 | 61 | struct usb_usbvision *usbvision; |
781aa1d1 MCC |
62 | int i, ret = -1; |
63 | char buf[4]; | |
64 | ||
bf8b20e1 | 65 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
781aa1d1 MCC |
66 | buf[0] = 0x00; |
67 | for (i = 0; i <= retries; i++) { | |
1ff16c20 | 68 | ret = (usbvision_i2c_write(usbvision, addr, buf, 1)); |
781aa1d1 MCC |
69 | if (ret == 1) |
70 | break; /* success! */ | |
c6268461 | 71 | udelay(5); |
781aa1d1 MCC |
72 | if (i == retries) /* no success */ |
73 | break; | |
c6268461 | 74 | udelay(10); |
781aa1d1 | 75 | } |
483dfdb6 | 76 | if (i) { |
1ff16c20 TM |
77 | PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr); |
78 | PDEBUG(DBG_I2C,"Maybe there's no device at this address"); | |
781aa1d1 MCC |
79 | } |
80 | return ret; | |
81 | } | |
82 | ||
83 | static inline int try_read_address(struct i2c_adapter *i2c_adap, | |
84 | unsigned char addr, int retries) | |
85 | { | |
1ff16c20 | 86 | struct usb_usbvision *usbvision; |
781aa1d1 MCC |
87 | int i, ret = -1; |
88 | char buf[4]; | |
89 | ||
bf8b20e1 | 90 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
781aa1d1 | 91 | for (i = 0; i <= retries; i++) { |
1ff16c20 | 92 | ret = (usbvision_i2c_read(usbvision, addr, buf, 1)); |
781aa1d1 MCC |
93 | if (ret == 1) |
94 | break; /* success! */ | |
c6268461 | 95 | udelay(5); |
781aa1d1 MCC |
96 | if (i == retries) /* no success */ |
97 | break; | |
c6268461 | 98 | udelay(10); |
781aa1d1 | 99 | } |
483dfdb6 | 100 | if (i) { |
1ff16c20 TM |
101 | PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr); |
102 | PDEBUG(DBG_I2C,"Maybe there's no device at this address"); | |
781aa1d1 MCC |
103 | } |
104 | return ret; | |
105 | } | |
106 | ||
107 | static inline int usb_find_address(struct i2c_adapter *i2c_adap, | |
108 | struct i2c_msg *msg, int retries, | |
109 | unsigned char *add) | |
110 | { | |
111 | unsigned short flags = msg->flags; | |
f2242ee5 | 112 | |
781aa1d1 MCC |
113 | unsigned char addr; |
114 | int ret; | |
115 | if ((flags & I2C_M_TEN)) { | |
116 | /* a ten bit address */ | |
117 | addr = 0xf0 | ((msg->addr >> 7) & 0x03); | |
118 | /* try extended address code... */ | |
119 | ret = try_write_address(i2c_adap, addr, retries); | |
120 | if (ret != 1) { | |
be9ed511 MCC |
121 | dev_err(&i2c_adap->dev, |
122 | "died at extended address code, while writing\n"); | |
781aa1d1 MCC |
123 | return -EREMOTEIO; |
124 | } | |
125 | add[0] = addr; | |
126 | if (flags & I2C_M_RD) { | |
127 | /* okay, now switch into reading mode */ | |
128 | addr |= 0x01; | |
129 | ret = try_read_address(i2c_adap, addr, retries); | |
130 | if (ret != 1) { | |
be9ed511 MCC |
131 | dev_err(&i2c_adap->dev, |
132 | "died at extended address code, while reading\n"); | |
781aa1d1 MCC |
133 | return -EREMOTEIO; |
134 | } | |
135 | } | |
136 | ||
137 | } else { /* normal 7bit address */ | |
138 | addr = (msg->addr << 1); | |
139 | if (flags & I2C_M_RD) | |
140 | addr |= 1; | |
781aa1d1 MCC |
141 | |
142 | add[0] = addr; | |
143 | if (flags & I2C_M_RD) | |
144 | ret = try_read_address(i2c_adap, addr, retries); | |
145 | else | |
146 | ret = try_write_address(i2c_adap, addr, retries); | |
147 | ||
148 | if (ret != 1) { | |
149 | return -EREMOTEIO; | |
150 | } | |
151 | } | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int | |
1ff16c20 | 156 | usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) |
781aa1d1 MCC |
157 | { |
158 | struct i2c_msg *pmsg; | |
1ff16c20 | 159 | struct usb_usbvision *usbvision; |
781aa1d1 | 160 | int i, ret; |
cf8e193a | 161 | unsigned char addr = 0; |
781aa1d1 | 162 | |
bf8b20e1 TM |
163 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
164 | ||
781aa1d1 MCC |
165 | for (i = 0; i < num; i++) { |
166 | pmsg = &msgs[i]; | |
167 | ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr); | |
168 | if (ret != 0) { | |
1ff16c20 | 169 | PDEBUG(DBG_I2C,"got NAK from device, message #%d", i); |
781aa1d1 MCC |
170 | return (ret < 0) ? ret : -EREMOTEIO; |
171 | } | |
172 | ||
173 | if (pmsg->flags & I2C_M_RD) { | |
174 | /* read bytes into buffer */ | |
1ff16c20 | 175 | ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len)); |
781aa1d1 MCC |
176 | if (ret < pmsg->len) { |
177 | return (ret < 0) ? ret : -EREMOTEIO; | |
178 | } | |
179 | } else { | |
180 | /* write bytes from buffer */ | |
1ff16c20 | 181 | ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len)); |
781aa1d1 MCC |
182 | if (ret < pmsg->len) { |
183 | return (ret < 0) ? ret : -EREMOTEIO; | |
184 | } | |
185 | } | |
186 | } | |
187 | return num; | |
188 | } | |
189 | ||
1ff16c20 | 190 | static u32 functionality(struct i2c_adapter *adap) |
781aa1d1 | 191 | { |
39f46ade | 192 | return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; |
781aa1d1 MCC |
193 | } |
194 | ||
781aa1d1 MCC |
195 | /* -----exported algorithm data: ------------------------------------- */ |
196 | ||
1ff16c20 TM |
197 | static struct i2c_algorithm usbvision_algo = { |
198 | .master_xfer = usbvision_i2c_xfer, | |
781aa1d1 | 199 | .smbus_xfer = NULL, |
1ff16c20 | 200 | .functionality = functionality, |
781aa1d1 MCC |
201 | }; |
202 | ||
203 | ||
483dfdb6 TM |
204 | /* ----------------------------------------------------------------------- */ |
205 | /* usbvision specific I2C functions */ | |
206 | /* ----------------------------------------------------------------------- */ | |
207 | static struct i2c_adapter i2c_adap_template; | |
483dfdb6 | 208 | |
1ff16c20 | 209 | int usbvision_i2c_register(struct usb_usbvision *usbvision) |
483dfdb6 | 210 | { |
1df79537 HV |
211 | static unsigned short saa711x_addrs[] = { |
212 | 0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */ | |
213 | 0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */ | |
214 | I2C_CLIENT_END }; | |
215 | ||
bf8b20e1 TM |
216 | memcpy(&usbvision->i2c_adap, &i2c_adap_template, |
217 | sizeof(struct i2c_adapter)); | |
483dfdb6 | 218 | |
1ff16c20 | 219 | sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name), |
c6330fb8 | 220 | " #%d", usbvision->vdev->num); |
bf8b20e1 TM |
221 | PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name); |
222 | usbvision->i2c_adap.dev.parent = &usbvision->dev->dev; | |
223 | ||
1df79537 | 224 | i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev); |
483dfdb6 TM |
225 | |
226 | if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) { | |
bf8b20e1 | 227 | printk(KERN_ERR "usbvision_register: can't write reg\n"); |
483dfdb6 TM |
228 | return -EBUSY; |
229 | } | |
230 | ||
1df79537 HV |
231 | PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]"); |
232 | PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]"); | |
233 | ||
234 | /* register new adapter to i2c module... */ | |
235 | ||
236 | usbvision->i2c_adap.algo = &usbvision_algo; | |
237 | ||
238 | usbvision->i2c_adap.timeout = 100; /* default values, should */ | |
239 | usbvision->i2c_adap.retries = 3; /* be replaced by defines */ | |
240 | ||
241 | i2c_add_adapter(&usbvision->i2c_adap); | |
242 | ||
243 | PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name); | |
244 | ||
483dfdb6 TM |
245 | /* Request the load of the i2c modules we need */ |
246 | switch (usbvision_device_data[usbvision->DevModel].Codec) { | |
247 | case CODEC_SAA7113: | |
483dfdb6 | 248 | case CODEC_SAA7111: |
e6574f2f HV |
249 | v4l2_i2c_new_probed_subdev(&usbvision->v4l2_dev, |
250 | &usbvision->i2c_adap, "saa7115", | |
1df79537 | 251 | "saa7115_auto", saa711x_addrs); |
483dfdb6 TM |
252 | break; |
253 | } | |
254 | if (usbvision_device_data[usbvision->DevModel].Tuner == 1) { | |
1df79537 HV |
255 | struct v4l2_subdev *sd; |
256 | enum v4l2_i2c_tuner_type type; | |
257 | struct tuner_setup tun_setup; | |
258 | ||
e6574f2f HV |
259 | sd = v4l2_i2c_new_probed_subdev(&usbvision->v4l2_dev, |
260 | &usbvision->i2c_adap, "tuner", | |
1df79537 HV |
261 | "tuner", v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); |
262 | /* depending on whether we found a demod or not, select | |
263 | the tuner type. */ | |
264 | type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV; | |
265 | ||
e6574f2f HV |
266 | sd = v4l2_i2c_new_probed_subdev(&usbvision->v4l2_dev, |
267 | &usbvision->i2c_adap, "tuner", | |
1df79537 HV |
268 | "tuner", v4l2_i2c_tuner_addrs(type)); |
269 | ||
270 | if (usbvision->tuner_type != -1) { | |
271 | tun_setup.mode_mask = T_ANALOG_TV | T_RADIO; | |
272 | tun_setup.type = usbvision->tuner_type; | |
273 | tun_setup.addr = v4l2_i2c_subdev_addr(sd); | |
274 | call_all(usbvision, tuner, s_type_addr, &tun_setup); | |
275 | } | |
781aa1d1 | 276 | } |
781aa1d1 | 277 | |
1df79537 | 278 | return 0; |
1ff16c20 TM |
279 | } |
280 | ||
281 | int usbvision_i2c_unregister(struct usb_usbvision *usbvision) | |
282 | { | |
283 | ||
284 | i2c_del_adapter(&(usbvision->i2c_adap)); | |
285 | ||
286 | PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name); | |
287 | ||
288 | return 0; | |
483dfdb6 TM |
289 | } |
290 | ||
483dfdb6 TM |
291 | static int |
292 | usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr, | |
293 | char *buf, short len) | |
294 | { | |
295 | int rc, retries; | |
296 | ||
297 | for (retries = 5;;) { | |
298 | rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr); | |
299 | if (rc < 0) | |
300 | return rc; | |
301 | ||
302 | /* Initiate byte read cycle */ | |
303 | /* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */ | |
304 | /* d3 0=Wr 1=Rd */ | |
305 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, | |
306 | (len & 0x07) | 0x18); | |
307 | if (rc < 0) | |
308 | return rc; | |
309 | ||
310 | /* Test for Busy and ACK */ | |
311 | do { | |
312 | /* USBVISION_SER_CONT -> d4 == 0 busy */ | |
313 | rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT); | |
314 | } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */ | |
315 | if (rc < 0) | |
316 | return rc; | |
317 | ||
318 | /* USBVISION_SER_CONT -> d5 == 1 Not ack */ | |
319 | if ((rc & 0x20) == 0) /* Ack? */ | |
320 | break; | |
321 | ||
322 | /* I2C abort */ | |
323 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00); | |
324 | if (rc < 0) | |
325 | return rc; | |
326 | ||
327 | if (--retries < 0) | |
328 | return -1; | |
329 | } | |
330 | ||
331 | switch (len) { | |
332 | case 4: | |
333 | buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4); | |
334 | case 3: | |
335 | buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3); | |
336 | case 2: | |
337 | buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2); | |
338 | case 1: | |
339 | buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1); | |
340 | break; | |
341 | default: | |
342 | printk(KERN_ERR | |
343 | "usbvision_i2c_read_max4: buffer length > 4\n"); | |
344 | } | |
345 | ||
346 | if (i2c_debug & DBG_I2C) { | |
347 | int idx; | |
348 | for (idx = 0; idx < len; idx++) { | |
349 | PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr); | |
350 | } | |
351 | } | |
352 | return len; | |
353 | } | |
354 | ||
355 | ||
356 | static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision, | |
357 | unsigned char addr, const char *buf, | |
358 | short len) | |
359 | { | |
360 | int rc, retries; | |
361 | int i; | |
362 | unsigned char value[6]; | |
363 | unsigned char ser_cont; | |
364 | ||
365 | ser_cont = (len & 0x07) | 0x10; | |
366 | ||
367 | value[0] = addr; | |
368 | value[1] = ser_cont; | |
369 | for (i = 0; i < len; i++) | |
370 | value[i + 2] = buf[i]; | |
371 | ||
372 | for (retries = 5;;) { | |
373 | rc = usb_control_msg(usbvision->dev, | |
374 | usb_sndctrlpipe(usbvision->dev, 1), | |
375 | USBVISION_OP_CODE, | |
376 | USB_DIR_OUT | USB_TYPE_VENDOR | | |
377 | USB_RECIP_ENDPOINT, 0, | |
378 | (__u16) USBVISION_SER_ADRS, value, | |
379 | len + 2, HZ); | |
380 | ||
381 | if (rc < 0) | |
382 | return rc; | |
383 | ||
384 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, | |
385 | (len & 0x07) | 0x10); | |
386 | if (rc < 0) | |
387 | return rc; | |
388 | ||
389 | /* Test for Busy and ACK */ | |
390 | do { | |
391 | rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT); | |
392 | } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */ | |
393 | if (rc < 0) | |
394 | return rc; | |
395 | ||
396 | if ((rc & 0x20) == 0) /* Ack? */ | |
397 | break; | |
398 | ||
399 | /* I2C abort */ | |
400 | usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00); | |
401 | ||
402 | if (--retries < 0) | |
403 | return -1; | |
404 | ||
405 | } | |
406 | ||
407 | if (i2c_debug & DBG_I2C) { | |
408 | int idx; | |
409 | for (idx = 0; idx < len; idx++) { | |
410 | PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr); | |
411 | } | |
412 | } | |
413 | return len; | |
414 | } | |
415 | ||
1ff16c20 | 416 | static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
483dfdb6 TM |
417 | short len) |
418 | { | |
419 | char *bufPtr = buf; | |
420 | int retval; | |
421 | int wrcount = 0; | |
422 | int count; | |
423 | int maxLen = 4; | |
483dfdb6 TM |
424 | |
425 | while (len > 0) { | |
426 | count = (len > maxLen) ? maxLen : len; | |
427 | retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count); | |
428 | if (retval > 0) { | |
429 | len -= count; | |
430 | bufPtr += count; | |
431 | wrcount += count; | |
432 | } else | |
433 | return (retval < 0) ? retval : -EFAULT; | |
434 | } | |
435 | return wrcount; | |
436 | } | |
437 | ||
1ff16c20 | 438 | static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
483dfdb6 TM |
439 | short len) |
440 | { | |
441 | char temp[4]; | |
442 | int retval, i; | |
443 | int rdcount = 0; | |
444 | int count; | |
483dfdb6 TM |
445 | |
446 | while (len > 0) { | |
447 | count = (len > 3) ? 4 : len; | |
448 | retval = usbvision_i2c_read_max4(usbvision, addr, temp, count); | |
449 | if (retval > 0) { | |
450 | for (i = 0; i < len; i++) | |
451 | buf[rdcount + i] = temp[i]; | |
452 | len -= count; | |
453 | rdcount += count; | |
454 | } else | |
455 | return (retval < 0) ? retval : -EFAULT; | |
456 | } | |
457 | return rdcount; | |
458 | } | |
459 | ||
483dfdb6 TM |
460 | static struct i2c_adapter i2c_adap_template = { |
461 | .owner = THIS_MODULE, | |
462 | .name = "usbvision", | |
483dfdb6 TM |
463 | }; |
464 | ||
483dfdb6 TM |
465 | /* |
466 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
467 | * --------------------------------------------------------------------------- | |
468 | * Local variables: | |
469 | * c-basic-offset: 8 | |
470 | * End: | |
471 | */ |