V4L/DVB (10135): v4l2: introduce v4l2_file_operations.
[linux-2.6.git] / drivers / media / video / bt8xx / bttv-i2c.c
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
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
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
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
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
114 static u32 functionality(struct i2c_adapter *adap)
115 {
116         return I2C_FUNC_SMBUS_EMUL;
117 }
118
119 static int
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
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
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
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
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
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 */
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 */
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 */
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
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 */
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
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  */