1 /*
2
3 bttv-i2c.c -- all the i2c code is here
4
5 bttv - Bt848 frame grabber driver
6
7 Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
8 & Marcus Metzler (mocm@thp.uni-koeln.de)
9 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
10
11 (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
12 - Multituner support and i2c address binding
13
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/delay.h>
33
34 #include "bttvp.h"
35 #include <media/v4l2-common.h>
36 #include <linux/jiffies.h>
37 #include <asm/io.h>
38
39 static int attach_inform(struct i2c_client *client);
40
41 static int i2c_debug;
42 static int i2c_hw;
43 static int i2c_scan;
44 module_param(i2c_debug, int, 0644);
45 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
46 module_param(i2c_hw, int, 0444);
47 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
48 "instead of software bitbang");
49 module_param(i2c_scan, int, 0444);
50 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
51
52 static unsigned int i2c_udelay = 5;
53 module_param(i2c_udelay, int, 0444);
54 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
55 "(should be 5 or higher). Lower value means higher bus speed.");
56
57 /* ----------------------------------------------------------------------- */
58 /* I2C functions - bitbanging adapter (software i2c) */
59
bttv_bit_setscl(void * data,int state)60 static void bttv_bit_setscl(void *data, int state)
61 {
62 struct bttv *btv = (struct bttv*)data;
63
64 if (state)
65 btv->i2c_state |= 0x02;
66 else
67 btv->i2c_state &= ~0x02;
68 btwrite(btv->i2c_state, BT848_I2C);
69 btread(BT848_I2C);
70 }
71
bttv_bit_setsda(void * data,int state)72 static void bttv_bit_setsda(void *data, int state)
73 {
74 struct bttv *btv = (struct bttv*)data;
75
76 if (state)
77 btv->i2c_state |= 0x01;
78 else
79 btv->i2c_state &= ~0x01;
80 btwrite(btv->i2c_state, BT848_I2C);
81 btread(BT848_I2C);
82 }
83
bttv_bit_getscl(void * data)84 static int bttv_bit_getscl(void *data)
85 {
86 struct bttv *btv = (struct bttv*)data;
87 int state;
88
89 state = btread(BT848_I2C) & 0x02 ? 1 : 0;
90 return state;
91 }
92
bttv_bit_getsda(void * data)93 static int bttv_bit_getsda(void *data)
94 {
95 struct bttv *btv = (struct bttv*)data;
96 int state;
97
98 state = btread(BT848_I2C) & 0x01;
99 return state;
100 }
101
102 static struct i2c_algo_bit_data __devinitdata bttv_i2c_algo_bit_template = {
103 .setsda = bttv_bit_setsda,
104 .setscl = bttv_bit_setscl,
105 .getsda = bttv_bit_getsda,
106 .getscl = bttv_bit_getscl,
107 .udelay = 16,
108 .timeout = 200,
109 };
110
111 /* ----------------------------------------------------------------------- */
112 /* I2C functions - hardware i2c */
113
functionality(struct i2c_adapter * adap)114 static u32 functionality(struct i2c_adapter *adap)
115 {
116 return I2C_FUNC_SMBUS_EMUL;
117 }
118
119 static int
bttv_i2c_wait_done(struct bttv * btv)120 bttv_i2c_wait_done(struct bttv *btv)
121 {
122 int rc = 0;
123
124 /* timeout */
125 if (wait_event_interruptible_timeout(btv->i2c_queue,
126 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
127
128 rc = -EIO;
129
130 if (btv->i2c_done & BT848_INT_RACK)
131 rc = 1;
132 btv->i2c_done = 0;
133 return rc;
134 }
135
136 #define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
137 BT848_I2C_SCL | BT848_I2C_SDA)
138
139 static int
bttv_i2c_sendbytes(struct bttv * btv,const struct i2c_msg * msg,int last)140 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
141 {
142 u32 xmit;
143 int retval,cnt;
144
145 /* sanity checks */
146 if (0 == msg->len)
147 return -EINVAL;
148
149 /* start, address + first byte */
150 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
151 if (msg->len > 1 || !last)
152 xmit |= BT878_I2C_NOSTOP;
153 btwrite(xmit, BT848_I2C);
154 retval = bttv_i2c_wait_done(btv);
155 if (retval < 0)
156 goto err;
157 if (retval == 0)
158 goto eio;
159 if (i2c_debug) {
160 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
161 if (!(xmit & BT878_I2C_NOSTOP))
162 printk(" >\n");
163 }
164
165 for (cnt = 1; cnt < msg->len; cnt++ ) {
166 /* following bytes */
167 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
168 if (cnt < msg->len-1 || !last)
169 xmit |= BT878_I2C_NOSTOP;
170 btwrite(xmit, BT848_I2C);
171 retval = bttv_i2c_wait_done(btv);
172 if (retval < 0)
173 goto err;
174 if (retval == 0)
175 goto eio;
176 if (i2c_debug) {
177 printk(" %02x", msg->buf[cnt]);
178 if (!(xmit & BT878_I2C_NOSTOP))
179 printk(" >\n");
180 }
181 }
182 return msg->len;
183
184 eio:
185 retval = -EIO;
186 err:
187 if (i2c_debug)
188 printk(" ERR: %d\n",retval);
189 return retval;
190 }
191
192 static int
bttv_i2c_readbytes(struct bttv * btv,const struct i2c_msg * msg,int last)193 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
194 {
195 u32 xmit;
196 u32 cnt;
197 int retval;
198
199 for(cnt = 0; cnt < msg->len; cnt++) {
200 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
201 if (cnt < msg->len-1)
202 xmit |= BT848_I2C_W3B;
203 if (cnt < msg->len-1 || !last)
204 xmit |= BT878_I2C_NOSTOP;
205 if (cnt)
206 xmit |= BT878_I2C_NOSTART;
207 btwrite(xmit, BT848_I2C);
208 retval = bttv_i2c_wait_done(btv);
209 if (retval < 0)
210 goto err;
211 if (retval == 0)
212 goto eio;
213 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
214 if (i2c_debug) {
215 if (!(xmit & BT878_I2C_NOSTART))
216 printk(" <R %02x", (msg->addr << 1) +1);
217 printk(" =%02x", msg->buf[cnt]);
218 if (!(xmit & BT878_I2C_NOSTOP))
219 printk(" >\n");
220 }
221 }
222 return msg->len;
223
224 eio:
225 retval = -EIO;
226 err:
227 if (i2c_debug)
228 printk(" ERR: %d\n",retval);
229 return retval;
230 }
231
bttv_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg * msgs,int num)232 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
233 {
234 struct bttv *btv = i2c_get_adapdata(i2c_adap);
235 int retval = 0;
236 int i;
237
238 if (i2c_debug)
239 printk("bt-i2c:");
240 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
241 for (i = 0 ; i < num; i++) {
242 if (msgs[i].flags & I2C_M_RD) {
243 /* read */
244 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
245 if (retval < 0)
246 goto err;
247 } else {
248 /* write */
249 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
250 if (retval < 0)
251 goto err;
252 }
253 }
254 return num;
255
256 err:
257 return retval;
258 }
259
260 static const struct i2c_algorithm bttv_algo = {
261 .master_xfer = bttv_i2c_xfer,
262 .functionality = functionality,
263 };
264
265 /* ----------------------------------------------------------------------- */
266 /* I2C functions - common stuff */
267
attach_inform(struct i2c_client * client)268 static int attach_inform(struct i2c_client *client)
269 {
270 struct bttv *btv = i2c_get_adapdata(client->adapter);
271 int addr=ADDR_UNSET;
272
273
274 if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
275 addr = bttv_tvcards[btv->c.type].tuner_addr;
276
277
278 if (bttv_debug)
279 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
280 btv->c.nr, client->driver->driver.name, client->addr,
281 client->name);
282 if (!client->driver->command)
283 return 0;
284
285 if (client->driver->id == I2C_DRIVERID_MSP3400)
286 btv->i2c_msp34xx_client = client;
287 if (client->driver->id == I2C_DRIVERID_TVAUDIO)
288 btv->i2c_tvaudio_client = client;
289 if (btv->tuner_type != UNSET) {
290 struct tuner_setup tun_setup;
291
292 if ((addr==ADDR_UNSET) ||
293 (addr==client->addr)) {
294
295 tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
296 tun_setup.type = btv->tuner_type;
297 tun_setup.addr = addr;
298 bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
299 }
300
301 }
302
303 return 0;
304 }
305
bttv_call_i2c_clients(struct bttv * btv,unsigned int cmd,void * arg)306 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
307 {
308 if (0 != btv->i2c_rc)
309 return;
310 i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
311 }
312
313
314 /* read I2C */
bttv_I2CRead(struct bttv * btv,unsigned char addr,char * probe_for)315 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
316 {
317 unsigned char buffer = 0;
318
319 if (0 != btv->i2c_rc)
320 return -1;
321 if (bttv_verbose && NULL != probe_for)
322 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
323 btv->c.nr,probe_for,addr);
324 btv->i2c_client.addr = addr >> 1;
325 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
326 if (NULL != probe_for) {
327 if (bttv_verbose)
328 printk("not found\n");
329 } else
330 printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
331 btv->c.nr,addr);
332 return -1;
333 }
334 if (bttv_verbose && NULL != probe_for)
335 printk("found\n");
336 return buffer;
337 }
338
339 /* write I2C */
bttv_I2CWrite(struct bttv * btv,unsigned char addr,unsigned char b1,unsigned char b2,int both)340 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
341 unsigned char b2, int both)
342 {
343 unsigned char buffer[2];
344 int bytes = both ? 2 : 1;
345
346 if (0 != btv->i2c_rc)
347 return -1;
348 btv->i2c_client.addr = addr >> 1;
349 buffer[0] = b1;
350 buffer[1] = b2;
351 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
352 return -1;
353 return 0;
354 }
355
356 /* read EEPROM content */
bttv_readee(struct bttv * btv,unsigned char * eedata,int addr)357 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
358 {
359 memset(eedata, 0, 256);
360 if (0 != btv->i2c_rc)
361 return;
362 btv->i2c_client.addr = addr >> 1;
363 tveeprom_read(&btv->i2c_client, eedata, 256);
364 }
365
366 static char *i2c_devs[128] = {
367 [ 0x1c >> 1 ] = "lgdt330x",
368 [ 0x30 >> 1 ] = "IR (hauppauge)",
369 [ 0x80 >> 1 ] = "msp34xx",
370 [ 0x86 >> 1 ] = "tda9887",
371 [ 0xa0 >> 1 ] = "eeprom",
372 [ 0xc0 >> 1 ] = "tuner (analog)",
373 [ 0xc2 >> 1 ] = "tuner (analog)",
374 };
375
do_i2c_scan(char * name,struct i2c_client * c)376 static void do_i2c_scan(char *name, struct i2c_client *c)
377 {
378 unsigned char buf;
379 int i,rc;
380
381 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
382 c->addr = i;
383 rc = i2c_master_recv(c,&buf,0);
384 if (rc < 0)
385 continue;
386 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
387 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
388 }
389 }
390
391 /* init + register i2c algo-bit adapter */
init_bttv_i2c(struct bttv * btv)392 int __devinit init_bttv_i2c(struct bttv *btv)
393 {
394 strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
395
396 if (i2c_hw)
397 btv->use_i2c_hw = 1;
398 if (btv->use_i2c_hw) {
399 /* bt878 */
400 strlcpy(btv->c.i2c_adap.name, "bt878",
401 sizeof(btv->c.i2c_adap.name));
402 btv->c.i2c_adap.id = I2C_HW_B_BT848; /* FIXME */
403 btv->c.i2c_adap.algo = &bttv_algo;
404 } else {
405 /* bt848 */
406 /* Prevents usage of invalid delay values */
407 if (i2c_udelay<5)
408 i2c_udelay=5;
409
410 strlcpy(btv->c.i2c_adap.name, "bttv",
411 sizeof(btv->c.i2c_adap.name));
412 btv->c.i2c_adap.id = I2C_HW_B_BT848;
413 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
414 sizeof(bttv_i2c_algo_bit_template));
415 btv->i2c_algo.udelay = i2c_udelay;
416 btv->i2c_algo.data = btv;
417 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
418 }
419 btv->c.i2c_adap.owner = THIS_MODULE;
420 btv->c.i2c_adap.class = I2C_CLASS_TV_ANALOG;
421 btv->c.i2c_adap.client_register = attach_inform;
422
423 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
424 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
425 "bt%d #%d [%s]", btv->id, btv->c.nr,
426 btv->use_i2c_hw ? "hw" : "sw");
427
428 i2c_set_adapdata(&btv->c.i2c_adap, btv);
429 btv->i2c_client.adapter = &btv->c.i2c_adap;
430
431 if (bttv_tvcards[btv->c.type].no_video)
432 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
433 if (bttv_tvcards[btv->c.type].has_dvb)
434 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
435
436 if (btv->use_i2c_hw) {
437 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
438 } else {
439 bttv_bit_setscl(btv,1);
440 bttv_bit_setsda(btv,1);
441 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
442 }
443 if (0 == btv->i2c_rc && i2c_scan)
444 do_i2c_scan(btv->c.name,&btv->i2c_client);
445 return btv->i2c_rc;
446 }
447
fini_bttv_i2c(struct bttv * btv)448 int __devexit fini_bttv_i2c(struct bttv *btv)
449 {
450 if (0 != btv->i2c_rc)
451 return 0;
452
453 return i2c_del_adapter(&btv->c.i2c_adap);
454 }
455
456 /*
457 * Local variables:
458 * c-basic-offset: 8
459 * End:
460 */
461