Merge branch 'master' into next
[linux-2.6] / 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 i2c_debug;
40 static int i2c_hw;
41 static int i2c_scan;
42 module_param(i2c_debug, int, 0644);
43 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
44 module_param(i2c_hw,    int, 0444);
45 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
46                         "instead of software bitbang");
47 module_param(i2c_scan,  int, 0444);
48 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
49
50 static unsigned int i2c_udelay = 5;
51 module_param(i2c_udelay, int, 0444);
52 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
53                 "(should be 5 or higher). Lower value means higher bus speed.");
54
55 /* ----------------------------------------------------------------------- */
56 /* I2C functions - bitbanging adapter (software i2c)                       */
57
58 static void bttv_bit_setscl(void *data, int state)
59 {
60         struct bttv *btv = (struct bttv*)data;
61
62         if (state)
63                 btv->i2c_state |= 0x02;
64         else
65                 btv->i2c_state &= ~0x02;
66         btwrite(btv->i2c_state, BT848_I2C);
67         btread(BT848_I2C);
68 }
69
70 static void bttv_bit_setsda(void *data, int state)
71 {
72         struct bttv *btv = (struct bttv*)data;
73
74         if (state)
75                 btv->i2c_state |= 0x01;
76         else
77                 btv->i2c_state &= ~0x01;
78         btwrite(btv->i2c_state, BT848_I2C);
79         btread(BT848_I2C);
80 }
81
82 static int bttv_bit_getscl(void *data)
83 {
84         struct bttv *btv = (struct bttv*)data;
85         int state;
86
87         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
88         return state;
89 }
90
91 static int bttv_bit_getsda(void *data)
92 {
93         struct bttv *btv = (struct bttv*)data;
94         int state;
95
96         state = btread(BT848_I2C) & 0x01;
97         return state;
98 }
99
100 static struct i2c_algo_bit_data __devinitdata bttv_i2c_algo_bit_template = {
101         .setsda  = bttv_bit_setsda,
102         .setscl  = bttv_bit_setscl,
103         .getsda  = bttv_bit_getsda,
104         .getscl  = bttv_bit_getscl,
105         .udelay  = 16,
106         .timeout = 200,
107 };
108
109 /* ----------------------------------------------------------------------- */
110 /* I2C functions - hardware i2c                                            */
111
112 static u32 functionality(struct i2c_adapter *adap)
113 {
114         return I2C_FUNC_SMBUS_EMUL;
115 }
116
117 static int
118 bttv_i2c_wait_done(struct bttv *btv)
119 {
120         int rc = 0;
121
122         /* timeout */
123         if (wait_event_interruptible_timeout(btv->i2c_queue,
124                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
125
126         rc = -EIO;
127
128         if (btv->i2c_done & BT848_INT_RACK)
129                 rc = 1;
130         btv->i2c_done = 0;
131         return rc;
132 }
133
134 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
135                 BT848_I2C_SCL | BT848_I2C_SDA)
136
137 static int
138 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
139 {
140         u32 xmit;
141         int retval,cnt;
142
143         /* sanity checks */
144         if (0 == msg->len)
145                 return -EINVAL;
146
147         /* start, address + first byte */
148         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
149         if (msg->len > 1 || !last)
150                 xmit |= BT878_I2C_NOSTOP;
151         btwrite(xmit, BT848_I2C);
152         retval = bttv_i2c_wait_done(btv);
153         if (retval < 0)
154                 goto err;
155         if (retval == 0)
156                 goto eio;
157         if (i2c_debug) {
158                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
159                 if (!(xmit & BT878_I2C_NOSTOP))
160                         printk(" >\n");
161         }
162
163         for (cnt = 1; cnt < msg->len; cnt++ ) {
164                 /* following bytes */
165                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
166                 if (cnt < msg->len-1 || !last)
167                         xmit |= BT878_I2C_NOSTOP;
168                 btwrite(xmit, BT848_I2C);
169                 retval = bttv_i2c_wait_done(btv);
170                 if (retval < 0)
171                         goto err;
172                 if (retval == 0)
173                         goto eio;
174                 if (i2c_debug) {
175                         printk(" %02x", msg->buf[cnt]);
176                         if (!(xmit & BT878_I2C_NOSTOP))
177                                 printk(" >\n");
178                 }
179         }
180         return msg->len;
181
182  eio:
183         retval = -EIO;
184  err:
185         if (i2c_debug)
186                 printk(" ERR: %d\n",retval);
187         return retval;
188 }
189
190 static int
191 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
192 {
193         u32 xmit;
194         u32 cnt;
195         int retval;
196
197         for(cnt = 0; cnt < msg->len; cnt++) {
198                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
199                 if (cnt < msg->len-1)
200                         xmit |= BT848_I2C_W3B;
201                 if (cnt < msg->len-1 || !last)
202                         xmit |= BT878_I2C_NOSTOP;
203                 if (cnt)
204                         xmit |= BT878_I2C_NOSTART;
205                 btwrite(xmit, BT848_I2C);
206                 retval = bttv_i2c_wait_done(btv);
207                 if (retval < 0)
208                         goto err;
209                 if (retval == 0)
210                         goto eio;
211                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
212                 if (i2c_debug) {
213                         if (!(xmit & BT878_I2C_NOSTART))
214                                 printk(" <R %02x", (msg->addr << 1) +1);
215                         printk(" =%02x", msg->buf[cnt]);
216                         if (!(xmit & BT878_I2C_NOSTOP))
217                                 printk(" >\n");
218                 }
219         }
220         return msg->len;
221
222  eio:
223         retval = -EIO;
224  err:
225         if (i2c_debug)
226                 printk(" ERR: %d\n",retval);
227         return retval;
228 }
229
230 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
231 {
232         struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
233         struct bttv *btv = to_bttv(v4l2_dev);
234         int retval = 0;
235         int i;
236
237         if (i2c_debug)
238                 printk("bt-i2c:");
239         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
240         for (i = 0 ; i < num; i++) {
241                 if (msgs[i].flags & I2C_M_RD) {
242                         /* read */
243                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
244                         if (retval < 0)
245                                 goto err;
246                 } else {
247                         /* write */
248                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
249                         if (retval < 0)
250                                 goto err;
251                 }
252         }
253         return num;
254
255  err:
256         return retval;
257 }
258
259 static const struct i2c_algorithm bttv_algo = {
260         .master_xfer   = bttv_i2c_xfer,
261         .functionality = functionality,
262 };
263
264 /* ----------------------------------------------------------------------- */
265 /* I2C functions - common stuff                                            */
266
267 /* read I2C */
268 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
269 {
270         unsigned char buffer = 0;
271
272         if (0 != btv->i2c_rc)
273                 return -1;
274         if (bttv_verbose && NULL != probe_for)
275                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
276                        btv->c.nr,probe_for,addr);
277         btv->i2c_client.addr = addr >> 1;
278         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
279                 if (NULL != probe_for) {
280                         if (bttv_verbose)
281                                 printk("not found\n");
282                 } else
283                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
284                                btv->c.nr,addr);
285                 return -1;
286         }
287         if (bttv_verbose && NULL != probe_for)
288                 printk("found\n");
289         return buffer;
290 }
291
292 /* write I2C */
293 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
294                     unsigned char b2, int both)
295 {
296         unsigned char buffer[2];
297         int bytes = both ? 2 : 1;
298
299         if (0 != btv->i2c_rc)
300                 return -1;
301         btv->i2c_client.addr = addr >> 1;
302         buffer[0] = b1;
303         buffer[1] = b2;
304         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
305                 return -1;
306         return 0;
307 }
308
309 /* read EEPROM content */
310 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
311 {
312         memset(eedata, 0, 256);
313         if (0 != btv->i2c_rc)
314                 return;
315         btv->i2c_client.addr = addr >> 1;
316         tveeprom_read(&btv->i2c_client, eedata, 256);
317 }
318
319 static char *i2c_devs[128] = {
320         [ 0x1c >> 1 ] = "lgdt330x",
321         [ 0x30 >> 1 ] = "IR (hauppauge)",
322         [ 0x80 >> 1 ] = "msp34xx",
323         [ 0x86 >> 1 ] = "tda9887",
324         [ 0xa0 >> 1 ] = "eeprom",
325         [ 0xc0 >> 1 ] = "tuner (analog)",
326         [ 0xc2 >> 1 ] = "tuner (analog)",
327 };
328
329 static void do_i2c_scan(char *name, struct i2c_client *c)
330 {
331         unsigned char buf;
332         int i,rc;
333
334         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
335                 c->addr = i;
336                 rc = i2c_master_recv(c,&buf,0);
337                 if (rc < 0)
338                         continue;
339                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
340                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
341         }
342 }
343
344 /* init + register i2c algo-bit adapter */
345 int __devinit init_bttv_i2c(struct bttv *btv)
346 {
347         strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
348
349         if (i2c_hw)
350                 btv->use_i2c_hw = 1;
351         if (btv->use_i2c_hw) {
352                 /* bt878 */
353                 strlcpy(btv->c.i2c_adap.name, "bt878",
354                         sizeof(btv->c.i2c_adap.name));
355                 btv->c.i2c_adap.id = I2C_HW_B_BT848;    /* FIXME */
356                 btv->c.i2c_adap.algo = &bttv_algo;
357         } else {
358                 /* bt848 */
359         /* Prevents usage of invalid delay values */
360                 if (i2c_udelay<5)
361                         i2c_udelay=5;
362
363                 strlcpy(btv->c.i2c_adap.name, "bttv",
364                         sizeof(btv->c.i2c_adap.name));
365                 btv->c.i2c_adap.id = I2C_HW_B_BT848;
366                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
367                        sizeof(bttv_i2c_algo_bit_template));
368                 btv->i2c_algo.udelay = i2c_udelay;
369                 btv->i2c_algo.data = btv;
370                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
371         }
372         btv->c.i2c_adap.owner = THIS_MODULE;
373
374         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
375         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
376                  "bt%d #%d [%s]", btv->id, btv->c.nr,
377                  btv->use_i2c_hw ? "hw" : "sw");
378
379         i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
380         btv->i2c_client.adapter = &btv->c.i2c_adap;
381
382
383         if (btv->use_i2c_hw) {
384                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
385         } else {
386                 bttv_bit_setscl(btv,1);
387                 bttv_bit_setsda(btv,1);
388                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
389         }
390         if (0 == btv->i2c_rc && i2c_scan)
391                 do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
392         return btv->i2c_rc;
393 }
394
395 int __devexit fini_bttv_i2c(struct bttv *btv)
396 {
397         if (0 != btv->i2c_rc)
398                 return 0;
399
400         return i2c_del_adapter(&btv->c.i2c_adap);
401 }
402
403 /*
404  * Local variables:
405  * c-basic-offset: 8
406  * End:
407  */