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> | |
781aa1d1 MCC |
30 | #include <linux/init.h> |
31 | #include <asm/uaccess.h> | |
32 | #include <linux/ioport.h> | |
33 | #include <linux/errno.h> | |
781aa1d1 MCC |
34 | #include <linux/usb.h> |
35 | #include <linux/i2c.h> | |
483dfdb6 | 36 | #include "usbvision.h" |
781aa1d1 | 37 | |
483dfdb6 | 38 | #define DBG_I2C 1<<0 |
781aa1d1 | 39 | |
ff699e6b | 40 | static int i2c_debug; |
483dfdb6 TM |
41 | |
42 | module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver | |
43 | MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); | |
781aa1d1 | 44 | |
df18c319 TM |
45 | #define PDEBUG(level, fmt, args...) { \ |
46 | if (i2c_debug & (level)) \ | |
a482f327 GKH |
47 | printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \ |
48 | __func__, __LINE__ , ## args); \ | |
df18c319 | 49 | } |
781aa1d1 | 50 | |
1ff16c20 | 51 | static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
2a7e9a26 | 52 | short len); |
1ff16c20 | 53 | static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
2a7e9a26 MCC |
54 | short len); |
55 | ||
781aa1d1 MCC |
56 | static inline int try_write_address(struct i2c_adapter *i2c_adap, |
57 | unsigned char addr, int retries) | |
58 | { | |
1ff16c20 | 59 | struct usb_usbvision *usbvision; |
781aa1d1 MCC |
60 | int i, ret = -1; |
61 | char buf[4]; | |
62 | ||
bf8b20e1 | 63 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
781aa1d1 MCC |
64 | buf[0] = 0x00; |
65 | for (i = 0; i <= retries; i++) { | |
1ff16c20 | 66 | ret = (usbvision_i2c_write(usbvision, addr, buf, 1)); |
781aa1d1 MCC |
67 | if (ret == 1) |
68 | break; /* success! */ | |
c6268461 | 69 | udelay(5); |
781aa1d1 MCC |
70 | if (i == retries) /* no success */ |
71 | break; | |
c6268461 | 72 | udelay(10); |
781aa1d1 | 73 | } |
483dfdb6 | 74 | if (i) { |
1ff16c20 TM |
75 | PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr); |
76 | PDEBUG(DBG_I2C,"Maybe there's no device at this address"); | |
781aa1d1 MCC |
77 | } |
78 | return ret; | |
79 | } | |
80 | ||
81 | static inline int try_read_address(struct i2c_adapter *i2c_adap, | |
82 | unsigned char addr, int retries) | |
83 | { | |
1ff16c20 | 84 | struct usb_usbvision *usbvision; |
781aa1d1 MCC |
85 | int i, ret = -1; |
86 | char buf[4]; | |
87 | ||
bf8b20e1 | 88 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
781aa1d1 | 89 | for (i = 0; i <= retries; i++) { |
1ff16c20 | 90 | ret = (usbvision_i2c_read(usbvision, addr, buf, 1)); |
781aa1d1 MCC |
91 | if (ret == 1) |
92 | break; /* success! */ | |
c6268461 | 93 | udelay(5); |
781aa1d1 MCC |
94 | if (i == retries) /* no success */ |
95 | break; | |
c6268461 | 96 | udelay(10); |
781aa1d1 | 97 | } |
483dfdb6 | 98 | if (i) { |
1ff16c20 TM |
99 | PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr); |
100 | PDEBUG(DBG_I2C,"Maybe there's no device at this address"); | |
781aa1d1 MCC |
101 | } |
102 | return ret; | |
103 | } | |
104 | ||
105 | static inline int usb_find_address(struct i2c_adapter *i2c_adap, | |
106 | struct i2c_msg *msg, int retries, | |
107 | unsigned char *add) | |
108 | { | |
109 | unsigned short flags = msg->flags; | |
f2242ee5 | 110 | |
781aa1d1 MCC |
111 | unsigned char addr; |
112 | int ret; | |
113 | if ((flags & I2C_M_TEN)) { | |
114 | /* a ten bit address */ | |
115 | addr = 0xf0 | ((msg->addr >> 7) & 0x03); | |
116 | /* try extended address code... */ | |
117 | ret = try_write_address(i2c_adap, addr, retries); | |
118 | if (ret != 1) { | |
be9ed511 MCC |
119 | dev_err(&i2c_adap->dev, |
120 | "died at extended address code, while writing\n"); | |
781aa1d1 MCC |
121 | return -EREMOTEIO; |
122 | } | |
123 | add[0] = addr; | |
124 | if (flags & I2C_M_RD) { | |
125 | /* okay, now switch into reading mode */ | |
126 | addr |= 0x01; | |
127 | ret = try_read_address(i2c_adap, addr, retries); | |
128 | if (ret != 1) { | |
be9ed511 MCC |
129 | dev_err(&i2c_adap->dev, |
130 | "died at extended address code, while reading\n"); | |
781aa1d1 MCC |
131 | return -EREMOTEIO; |
132 | } | |
133 | } | |
134 | ||
135 | } else { /* normal 7bit address */ | |
136 | addr = (msg->addr << 1); | |
137 | if (flags & I2C_M_RD) | |
138 | addr |= 1; | |
781aa1d1 MCC |
139 | |
140 | add[0] = addr; | |
141 | if (flags & I2C_M_RD) | |
142 | ret = try_read_address(i2c_adap, addr, retries); | |
143 | else | |
144 | ret = try_write_address(i2c_adap, addr, retries); | |
145 | ||
146 | if (ret != 1) { | |
147 | return -EREMOTEIO; | |
148 | } | |
149 | } | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int | |
1ff16c20 | 154 | usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) |
781aa1d1 MCC |
155 | { |
156 | struct i2c_msg *pmsg; | |
1ff16c20 | 157 | struct usb_usbvision *usbvision; |
781aa1d1 | 158 | int i, ret; |
cf8e193a | 159 | unsigned char addr = 0; |
781aa1d1 | 160 | |
bf8b20e1 TM |
161 | usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap); |
162 | ||
781aa1d1 MCC |
163 | for (i = 0; i < num; i++) { |
164 | pmsg = &msgs[i]; | |
165 | ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr); | |
166 | if (ret != 0) { | |
1ff16c20 | 167 | PDEBUG(DBG_I2C,"got NAK from device, message #%d", i); |
781aa1d1 MCC |
168 | return (ret < 0) ? ret : -EREMOTEIO; |
169 | } | |
170 | ||
171 | if (pmsg->flags & I2C_M_RD) { | |
172 | /* read bytes into buffer */ | |
1ff16c20 | 173 | ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len)); |
781aa1d1 MCC |
174 | if (ret < pmsg->len) { |
175 | return (ret < 0) ? ret : -EREMOTEIO; | |
176 | } | |
177 | } else { | |
178 | /* write bytes from buffer */ | |
1ff16c20 | 179 | ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len)); |
781aa1d1 MCC |
180 | if (ret < pmsg->len) { |
181 | return (ret < 0) ? ret : -EREMOTEIO; | |
182 | } | |
183 | } | |
184 | } | |
185 | return num; | |
186 | } | |
187 | ||
1ff16c20 | 188 | static u32 functionality(struct i2c_adapter *adap) |
781aa1d1 | 189 | { |
39f46ade | 190 | return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; |
781aa1d1 MCC |
191 | } |
192 | ||
781aa1d1 MCC |
193 | /* -----exported algorithm data: ------------------------------------- */ |
194 | ||
1ff16c20 TM |
195 | static struct i2c_algorithm usbvision_algo = { |
196 | .master_xfer = usbvision_i2c_xfer, | |
781aa1d1 | 197 | .smbus_xfer = NULL, |
1ff16c20 | 198 | .functionality = functionality, |
781aa1d1 MCC |
199 | }; |
200 | ||
201 | ||
483dfdb6 TM |
202 | /* ----------------------------------------------------------------------- */ |
203 | /* usbvision specific I2C functions */ | |
204 | /* ----------------------------------------------------------------------- */ | |
205 | static struct i2c_adapter i2c_adap_template; | |
483dfdb6 | 206 | |
1ff16c20 | 207 | int usbvision_i2c_register(struct usb_usbvision *usbvision) |
483dfdb6 | 208 | { |
1df79537 HV |
209 | static unsigned short saa711x_addrs[] = { |
210 | 0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */ | |
211 | 0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */ | |
212 | I2C_CLIENT_END }; | |
213 | ||
bf8b20e1 TM |
214 | memcpy(&usbvision->i2c_adap, &i2c_adap_template, |
215 | sizeof(struct i2c_adapter)); | |
483dfdb6 | 216 | |
0fda5d44 LP |
217 | sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name, |
218 | usbvision->dev->bus->busnum, usbvision->dev->devpath); | |
bf8b20e1 TM |
219 | PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name); |
220 | usbvision->i2c_adap.dev.parent = &usbvision->dev->dev; | |
221 | ||
1df79537 | 222 | i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev); |
483dfdb6 TM |
223 | |
224 | if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) { | |
bf8b20e1 | 225 | printk(KERN_ERR "usbvision_register: can't write reg\n"); |
483dfdb6 TM |
226 | return -EBUSY; |
227 | } | |
228 | ||
1df79537 HV |
229 | PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]"); |
230 | PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]"); | |
231 | ||
232 | /* register new adapter to i2c module... */ | |
233 | ||
234 | usbvision->i2c_adap.algo = &usbvision_algo; | |
235 | ||
236 | usbvision->i2c_adap.timeout = 100; /* default values, should */ | |
237 | usbvision->i2c_adap.retries = 3; /* be replaced by defines */ | |
238 | ||
239 | i2c_add_adapter(&usbvision->i2c_adap); | |
240 | ||
241 | PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name); | |
242 | ||
483dfdb6 TM |
243 | /* Request the load of the i2c modules we need */ |
244 | switch (usbvision_device_data[usbvision->DevModel].Codec) { | |
245 | case CODEC_SAA7113: | |
483dfdb6 | 246 | case CODEC_SAA7111: |
53dacb15 | 247 | v4l2_i2c_new_subdev(&usbvision->v4l2_dev, |
e6574f2f | 248 | &usbvision->i2c_adap, "saa7115", |
53dacb15 | 249 | "saa7115_auto", 0, saa711x_addrs); |
483dfdb6 TM |
250 | break; |
251 | } | |
252 | if (usbvision_device_data[usbvision->DevModel].Tuner == 1) { | |
1df79537 HV |
253 | struct v4l2_subdev *sd; |
254 | enum v4l2_i2c_tuner_type type; | |
255 | struct tuner_setup tun_setup; | |
256 | ||
53dacb15 | 257 | sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev, |
e6574f2f | 258 | &usbvision->i2c_adap, "tuner", |
53dacb15 | 259 | "tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); |
1df79537 HV |
260 | /* depending on whether we found a demod or not, select |
261 | the tuner type. */ | |
262 | type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV; | |
263 | ||
53dacb15 | 264 | sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev, |
e6574f2f | 265 | &usbvision->i2c_adap, "tuner", |
53dacb15 | 266 | "tuner", 0, v4l2_i2c_tuner_addrs(type)); |
1df79537 HV |
267 | |
268 | if (usbvision->tuner_type != -1) { | |
269 | tun_setup.mode_mask = T_ANALOG_TV | T_RADIO; | |
270 | tun_setup.type = usbvision->tuner_type; | |
271 | tun_setup.addr = v4l2_i2c_subdev_addr(sd); | |
272 | call_all(usbvision, tuner, s_type_addr, &tun_setup); | |
273 | } | |
781aa1d1 | 274 | } |
781aa1d1 | 275 | |
1df79537 | 276 | return 0; |
1ff16c20 TM |
277 | } |
278 | ||
279 | int usbvision_i2c_unregister(struct usb_usbvision *usbvision) | |
280 | { | |
281 | ||
282 | i2c_del_adapter(&(usbvision->i2c_adap)); | |
283 | ||
284 | PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name); | |
285 | ||
286 | return 0; | |
483dfdb6 TM |
287 | } |
288 | ||
483dfdb6 TM |
289 | static int |
290 | usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr, | |
291 | char *buf, short len) | |
292 | { | |
293 | int rc, retries; | |
294 | ||
295 | for (retries = 5;;) { | |
296 | rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr); | |
297 | if (rc < 0) | |
298 | return rc; | |
299 | ||
300 | /* Initiate byte read cycle */ | |
301 | /* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */ | |
302 | /* d3 0=Wr 1=Rd */ | |
303 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, | |
304 | (len & 0x07) | 0x18); | |
305 | if (rc < 0) | |
306 | return rc; | |
307 | ||
308 | /* Test for Busy and ACK */ | |
309 | do { | |
310 | /* USBVISION_SER_CONT -> d4 == 0 busy */ | |
311 | rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT); | |
312 | } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */ | |
313 | if (rc < 0) | |
314 | return rc; | |
315 | ||
316 | /* USBVISION_SER_CONT -> d5 == 1 Not ack */ | |
317 | if ((rc & 0x20) == 0) /* Ack? */ | |
318 | break; | |
319 | ||
320 | /* I2C abort */ | |
321 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00); | |
322 | if (rc < 0) | |
323 | return rc; | |
324 | ||
325 | if (--retries < 0) | |
326 | return -1; | |
327 | } | |
328 | ||
329 | switch (len) { | |
330 | case 4: | |
331 | buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4); | |
332 | case 3: | |
333 | buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3); | |
334 | case 2: | |
335 | buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2); | |
336 | case 1: | |
337 | buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1); | |
338 | break; | |
339 | default: | |
340 | printk(KERN_ERR | |
341 | "usbvision_i2c_read_max4: buffer length > 4\n"); | |
342 | } | |
343 | ||
344 | if (i2c_debug & DBG_I2C) { | |
345 | int idx; | |
346 | for (idx = 0; idx < len; idx++) { | |
347 | PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr); | |
348 | } | |
349 | } | |
350 | return len; | |
351 | } | |
352 | ||
353 | ||
354 | static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision, | |
355 | unsigned char addr, const char *buf, | |
356 | short len) | |
357 | { | |
358 | int rc, retries; | |
359 | int i; | |
360 | unsigned char value[6]; | |
361 | unsigned char ser_cont; | |
362 | ||
363 | ser_cont = (len & 0x07) | 0x10; | |
364 | ||
365 | value[0] = addr; | |
366 | value[1] = ser_cont; | |
367 | for (i = 0; i < len; i++) | |
368 | value[i + 2] = buf[i]; | |
369 | ||
370 | for (retries = 5;;) { | |
371 | rc = usb_control_msg(usbvision->dev, | |
372 | usb_sndctrlpipe(usbvision->dev, 1), | |
373 | USBVISION_OP_CODE, | |
374 | USB_DIR_OUT | USB_TYPE_VENDOR | | |
375 | USB_RECIP_ENDPOINT, 0, | |
376 | (__u16) USBVISION_SER_ADRS, value, | |
377 | len + 2, HZ); | |
378 | ||
379 | if (rc < 0) | |
380 | return rc; | |
381 | ||
382 | rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, | |
383 | (len & 0x07) | 0x10); | |
384 | if (rc < 0) | |
385 | return rc; | |
386 | ||
387 | /* Test for Busy and ACK */ | |
388 | do { | |
389 | rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT); | |
390 | } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */ | |
391 | if (rc < 0) | |
392 | return rc; | |
393 | ||
394 | if ((rc & 0x20) == 0) /* Ack? */ | |
395 | break; | |
396 | ||
397 | /* I2C abort */ | |
398 | usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00); | |
399 | ||
400 | if (--retries < 0) | |
401 | return -1; | |
402 | ||
403 | } | |
404 | ||
405 | if (i2c_debug & DBG_I2C) { | |
406 | int idx; | |
407 | for (idx = 0; idx < len; idx++) { | |
408 | PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr); | |
409 | } | |
410 | } | |
411 | return len; | |
412 | } | |
413 | ||
1ff16c20 | 414 | static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
483dfdb6 TM |
415 | short len) |
416 | { | |
417 | char *bufPtr = buf; | |
418 | int retval; | |
419 | int wrcount = 0; | |
420 | int count; | |
421 | int maxLen = 4; | |
483dfdb6 TM |
422 | |
423 | while (len > 0) { | |
424 | count = (len > maxLen) ? maxLen : len; | |
425 | retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count); | |
426 | if (retval > 0) { | |
427 | len -= count; | |
428 | bufPtr += count; | |
429 | wrcount += count; | |
430 | } else | |
431 | return (retval < 0) ? retval : -EFAULT; | |
432 | } | |
433 | return wrcount; | |
434 | } | |
435 | ||
1ff16c20 | 436 | static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf, |
483dfdb6 TM |
437 | short len) |
438 | { | |
439 | char temp[4]; | |
440 | int retval, i; | |
441 | int rdcount = 0; | |
442 | int count; | |
483dfdb6 TM |
443 | |
444 | while (len > 0) { | |
445 | count = (len > 3) ? 4 : len; | |
446 | retval = usbvision_i2c_read_max4(usbvision, addr, temp, count); | |
447 | if (retval > 0) { | |
448 | for (i = 0; i < len; i++) | |
449 | buf[rdcount + i] = temp[i]; | |
450 | len -= count; | |
451 | rdcount += count; | |
452 | } else | |
453 | return (retval < 0) ? retval : -EFAULT; | |
454 | } | |
455 | return rdcount; | |
456 | } | |
457 | ||
483dfdb6 TM |
458 | static struct i2c_adapter i2c_adap_template = { |
459 | .owner = THIS_MODULE, | |
460 | .name = "usbvision", | |
483dfdb6 TM |
461 | }; |
462 | ||
483dfdb6 TM |
463 | /* |
464 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
465 | * --------------------------------------------------------------------------- | |
466 | * Local variables: | |
467 | * c-basic-offset: 8 | |
468 | * End: | |
469 | */ |