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_debug, "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
bttv_bit_setscl(void * data,int state)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
bttv_bit_setsda(void * data,int state)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
bttv_bit_getscl(void * data)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
bttv_bit_getsda(void * data)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
functionality(struct i2c_adapter * adap)112 static u32 functionality(struct i2c_adapter *adap)
113 {
114 return I2C_FUNC_SMBUS_EMUL;
115 }
116
117 static int
bttv_i2c_wait_done(struct bttv * btv)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 rc = -EIO;
126
127 if (btv->i2c_done & BT848_INT_RACK)
128 rc = 1;
129 btv->i2c_done = 0;
130 return rc;
131 }
132
133 #define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
134 BT848_I2C_SCL | BT848_I2C_SDA)
135
136 static int
bttv_i2c_sendbytes(struct bttv * btv,const struct i2c_msg * msg,int last)137 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
138 {
139 u32 xmit;
140 int retval,cnt;
141
142 /* sanity checks */
143 if (0 == msg->len)
144 return -EINVAL;
145
146 /* start, address + first byte */
147 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
148 if (msg->len > 1 || !last)
149 xmit |= BT878_I2C_NOSTOP;
150 btwrite(xmit, BT848_I2C);
151 retval = bttv_i2c_wait_done(btv);
152 if (retval < 0)
153 goto err;
154 if (retval == 0)
155 goto eio;
156 if (i2c_debug) {
157 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
158 if (!(xmit & BT878_I2C_NOSTOP))
159 printk(" >\n");
160 }
161
162 for (cnt = 1; cnt < msg->len; cnt++ ) {
163 /* following bytes */
164 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
165 if (cnt < msg->len-1 || !last)
166 xmit |= BT878_I2C_NOSTOP;
167 btwrite(xmit, BT848_I2C);
168 retval = bttv_i2c_wait_done(btv);
169 if (retval < 0)
170 goto err;
171 if (retval == 0)
172 goto eio;
173 if (i2c_debug) {
174 printk(" %02x", msg->buf[cnt]);
175 if (!(xmit & BT878_I2C_NOSTOP))
176 printk(" >\n");
177 }
178 }
179 return msg->len;
180
181 eio:
182 retval = -EIO;
183 err:
184 if (i2c_debug)
185 printk(" ERR: %d\n",retval);
186 return retval;
187 }
188
189 static int
bttv_i2c_readbytes(struct bttv * btv,const struct i2c_msg * msg,int last)190 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
191 {
192 u32 xmit;
193 u32 cnt;
194 int retval;
195
196 for(cnt = 0; cnt < msg->len; cnt++) {
197 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
198 if (cnt < msg->len-1)
199 xmit |= BT848_I2C_W3B;
200 if (cnt < msg->len-1 || !last)
201 xmit |= BT878_I2C_NOSTOP;
202 if (cnt)
203 xmit |= BT878_I2C_NOSTART;
204 btwrite(xmit, BT848_I2C);
205 retval = bttv_i2c_wait_done(btv);
206 if (retval < 0)
207 goto err;
208 if (retval == 0)
209 goto eio;
210 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
211 if (i2c_debug) {
212 if (!(xmit & BT878_I2C_NOSTART))
213 printk(" <R %02x", (msg->addr << 1) +1);
214 printk(" =%02x", msg->buf[cnt]);
215 if (!(xmit & BT878_I2C_NOSTOP))
216 printk(" >\n");
217 }
218 }
219 return msg->len;
220
221 eio:
222 retval = -EIO;
223 err:
224 if (i2c_debug)
225 printk(" ERR: %d\n",retval);
226 return retval;
227 }
228
bttv_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg * msgs,int num)229 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
230 {
231 struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
232 struct bttv *btv = to_bttv(v4l2_dev);
233 int retval = 0;
234 int i;
235
236 if (i2c_debug)
237 printk("bt-i2c:");
238 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
239 for (i = 0 ; i < num; i++) {
240 if (msgs[i].flags & I2C_M_RD) {
241 /* read */
242 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
243 if (retval < 0)
244 goto err;
245 } else {
246 /* write */
247 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
248 if (retval < 0)
249 goto err;
250 }
251 }
252 return num;
253
254 err:
255 return retval;
256 }
257
258 static const struct i2c_algorithm bttv_algo = {
259 .master_xfer = bttv_i2c_xfer,
260 .functionality = functionality,
261 };
262
263 /* ----------------------------------------------------------------------- */
264 /* I2C functions - common stuff */
265
266 /* read I2C */
bttv_I2CRead(struct bttv * btv,unsigned char addr,char * probe_for)267 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
268 {
269 unsigned char buffer = 0;
270
271 if (0 != btv->i2c_rc)
272 return -1;
273 if (bttv_verbose && NULL != probe_for)
274 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
275 btv->c.nr,probe_for,addr);
276 btv->i2c_client.addr = addr >> 1;
277 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
278 if (NULL != probe_for) {
279 if (bttv_verbose)
280 printk("not found\n");
281 } else
282 printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
283 btv->c.nr,addr);
284 return -1;
285 }
286 if (bttv_verbose && NULL != probe_for)
287 printk("found\n");
288 return buffer;
289 }
290
291 /* write I2C */
bttv_I2CWrite(struct bttv * btv,unsigned char addr,unsigned char b1,unsigned char b2,int both)292 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
293 unsigned char b2, int both)
294 {
295 unsigned char buffer[2];
296 int bytes = both ? 2 : 1;
297
298 if (0 != btv->i2c_rc)
299 return -1;
300 btv->i2c_client.addr = addr >> 1;
301 buffer[0] = b1;
302 buffer[1] = b2;
303 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
304 return -1;
305 return 0;
306 }
307
308 /* read EEPROM content */
bttv_readee(struct bttv * btv,unsigned char * eedata,int addr)309 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
310 {
311 memset(eedata, 0, 256);
312 if (0 != btv->i2c_rc)
313 return;
314 btv->i2c_client.addr = addr >> 1;
315 tveeprom_read(&btv->i2c_client, eedata, 256);
316 }
317
318 static char *i2c_devs[128] = {
319 [ 0x1c >> 1 ] = "lgdt330x",
320 [ 0x30 >> 1 ] = "IR (hauppauge)",
321 [ 0x80 >> 1 ] = "msp34xx",
322 [ 0x86 >> 1 ] = "tda9887",
323 [ 0xa0 >> 1 ] = "eeprom",
324 [ 0xc0 >> 1 ] = "tuner (analog)",
325 [ 0xc2 >> 1 ] = "tuner (analog)",
326 };
327
do_i2c_scan(char * name,struct i2c_client * c)328 static void do_i2c_scan(char *name, struct i2c_client *c)
329 {
330 unsigned char buf;
331 int i,rc;
332
333 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
334 c->addr = i;
335 rc = i2c_master_recv(c,&buf,0);
336 if (rc < 0)
337 continue;
338 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
339 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
340 }
341 }
342
343 /* init + register i2c algo-bit adapter */
init_bttv_i2c(struct bttv * btv)344 int __devinit init_bttv_i2c(struct bttv *btv)
345 {
346 strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
347
348 if (i2c_hw)
349 btv->use_i2c_hw = 1;
350 if (btv->use_i2c_hw) {
351 /* bt878 */
352 strlcpy(btv->c.i2c_adap.name, "bt878",
353 sizeof(btv->c.i2c_adap.name));
354 btv->c.i2c_adap.algo = &bttv_algo;
355 } else {
356 /* bt848 */
357 /* Prevents usage of invalid delay values */
358 if (i2c_udelay<5)
359 i2c_udelay=5;
360
361 strlcpy(btv->c.i2c_adap.name, "bttv",
362 sizeof(btv->c.i2c_adap.name));
363 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
364 sizeof(bttv_i2c_algo_bit_template));
365 btv->i2c_algo.udelay = i2c_udelay;
366 btv->i2c_algo.data = btv;
367 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
368 }
369 btv->c.i2c_adap.owner = THIS_MODULE;
370
371 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
372 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
373 "bt%d #%d [%s]", btv->id, btv->c.nr,
374 btv->use_i2c_hw ? "hw" : "sw");
375
376 i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
377 btv->i2c_client.adapter = &btv->c.i2c_adap;
378
379
380 if (btv->use_i2c_hw) {
381 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
382 } else {
383 bttv_bit_setscl(btv,1);
384 bttv_bit_setsda(btv,1);
385 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
386 }
387 if (0 == btv->i2c_rc && i2c_scan)
388 do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
389
390 return btv->i2c_rc;
391 }
392