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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
39static int i2c_debug;
40static int i2c_hw;
41static int i2c_scan;
42module_param(i2c_debug, int, 0644);
43MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
44module_param(i2c_hw, int, 0444);
45MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
46 "instead of software bitbang");
47module_param(i2c_scan, int, 0444);
48MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
49
50static unsigned int i2c_udelay = 5;
51module_param(i2c_udelay, int, 0444);
52MODULE_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
57
58static 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
70static 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
82static 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
91static 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
100static 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
111
112static u32 functionality(struct i2c_adapter *adap)
113{
114 return I2C_FUNC_SMBUS_EMUL;
115}
116
117static int
118bttv_i2c_wait_done(struct bttv *btv)
119{
120 int rc = 0;
121
122
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
137static int
138bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
139{
140 u32 xmit;
141 int retval,cnt;
142
143
144 if (0 == msg->len)
145 return -EINVAL;
146
147
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
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
190static int
191bttv_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
230static 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
243 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
244 if (retval < 0)
245 goto err;
246 } else {
247
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
259static const struct i2c_algorithm bttv_algo = {
260 .master_xfer = bttv_i2c_xfer,
261 .functionality = functionality,
262};
263
264
265
266
267
268int 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
293int 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
310void __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
319static 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
329static 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
345int __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
353 strlcpy(btv->c.i2c_adap.name, "bt878",
354 sizeof(btv->c.i2c_adap.name));
355 btv->c.i2c_adap.algo = &bttv_algo;
356 } else {
357
358
359 if (i2c_udelay<5)
360 i2c_udelay=5;
361
362 strlcpy(btv->c.i2c_adap.name, "bttv",
363 sizeof(btv->c.i2c_adap.name));
364 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
365 sizeof(bttv_i2c_algo_bit_template));
366 btv->i2c_algo.udelay = i2c_udelay;
367 btv->i2c_algo.data = btv;
368 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
369 }
370 btv->c.i2c_adap.owner = THIS_MODULE;
371
372 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
373 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
374 "bt%d #%d [%s]", btv->id, btv->c.nr,
375 btv->use_i2c_hw ? "hw" : "sw");
376
377 i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
378 btv->i2c_client.adapter = &btv->c.i2c_adap;
379
380
381 if (btv->use_i2c_hw) {
382 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
383 } else {
384 bttv_bit_setscl(btv,1);
385 bttv_bit_setsda(btv,1);
386 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
387 }
388 if (0 == btv->i2c_rc && i2c_scan)
389 do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
390
391
392 if (0 == btv->i2c_rc) {
393 struct i2c_board_info info;
394
395
396
397
398
399
400
401
402 const unsigned short addr_list[] = {
403 0x1a, 0x18, 0x4b, 0x64, 0x30,
404 I2C_CLIENT_END
405 };
406
407 memset(&info, 0, sizeof(struct i2c_board_info));
408 strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
409 i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list);
410 }
411 return btv->i2c_rc;
412}
413
414int __devexit fini_bttv_i2c(struct bttv *btv)
415{
416 if (0 != btv->i2c_rc)
417 return 0;
418
419 return i2c_del_adapter(&btv->c.i2c_adap);
420}
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