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30#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/delay.h>
35
36#include "bttvp.h"
37#include <media/v4l2-common.h>
38#include <linux/jiffies.h>
39#include <asm/io.h>
40
41static int i2c_debug;
42static int i2c_hw;
43static int i2c_scan;
44module_param(i2c_debug, int, 0644);
45MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
46module_param(i2c_hw, int, 0444);
47MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
48 "instead of software bitbang");
49module_param(i2c_scan, int, 0444);
50MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
51
52static unsigned int i2c_udelay = 5;
53module_param(i2c_udelay, int, 0444);
54MODULE_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
59
60static 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
72static 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
84static 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
93static 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
102static struct i2c_algo_bit_data 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
113
114static u32 functionality(struct i2c_adapter *adap)
115{
116 return I2C_FUNC_SMBUS_EMUL;
117}
118
119static int
120bttv_i2c_wait_done(struct bttv *btv)
121{
122 int rc = 0;
123
124
125 if (wait_event_interruptible_timeout(btv->i2c_queue,
126 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
127 rc = -EIO;
128
129 if (btv->i2c_done & BT848_INT_RACK)
130 rc = 1;
131 btv->i2c_done = 0;
132 return rc;
133}
134
135#define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
136 BT848_I2C_SCL | BT848_I2C_SDA)
137
138static int
139bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
140{
141 u32 xmit;
142 int retval,cnt;
143
144
145 if (0 == msg->len)
146 return -EINVAL;
147
148
149 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
150 if (msg->len > 1 || !last)
151 xmit |= BT878_I2C_NOSTOP;
152 btwrite(xmit, BT848_I2C);
153 retval = bttv_i2c_wait_done(btv);
154 if (retval < 0)
155 goto err;
156 if (retval == 0)
157 goto eio;
158 if (i2c_debug) {
159 pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
160 }
161
162 for (cnt = 1; cnt < msg->len; cnt++ ) {
163
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 pr_cont(" %02x", msg->buf[cnt]);
175 }
176 if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
177 pr_cont(">\n");
178 return msg->len;
179
180 eio:
181 retval = -EIO;
182 err:
183 if (i2c_debug)
184 pr_cont(" ERR: %d\n",retval);
185 return retval;
186}
187
188static int
189bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
190{
191 u32 xmit;
192 u32 cnt;
193 int retval;
194
195 for (cnt = 0; cnt < msg->len; cnt++) {
196 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
197 if (cnt < msg->len-1)
198 xmit |= BT848_I2C_W3B;
199 if (cnt < msg->len-1 || !last)
200 xmit |= BT878_I2C_NOSTOP;
201 if (cnt)
202 xmit |= BT878_I2C_NOSTART;
203
204 if (i2c_debug) {
205 if (!(xmit & BT878_I2C_NOSTART))
206 pr_cont(" <R %02x", (msg->addr << 1) +1);
207 }
208
209 btwrite(xmit, BT848_I2C);
210 retval = bttv_i2c_wait_done(btv);
211 if (retval < 0)
212 goto err;
213 if (retval == 0)
214 goto eio;
215 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
216 if (i2c_debug) {
217 pr_cont(" =%02x", msg->buf[cnt]);
218 }
219 if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
220 pr_cont(" >\n");
221 }
222
223
224 return msg->len;
225
226 eio:
227 retval = -EIO;
228 err:
229 if (i2c_debug)
230 pr_cont(" ERR: %d\n",retval);
231 return retval;
232}
233
234static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
235{
236 struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
237 struct bttv *btv = to_bttv(v4l2_dev);
238 int retval = 0;
239 int i;
240
241 if (i2c_debug)
242 pr_debug("bt-i2c:");
243
244 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
245 for (i = 0 ; i < num; i++) {
246 if (msgs[i].flags & I2C_M_RD) {
247
248 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
249 if (retval < 0)
250 goto err;
251 } else {
252
253 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
254 if (retval < 0)
255 goto err;
256 }
257 }
258 return num;
259
260 err:
261 return retval;
262}
263
264static const struct i2c_algorithm bttv_algo = {
265 .master_xfer = bttv_i2c_xfer,
266 .functionality = functionality,
267};
268
269
270
271
272
273int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
274{
275 unsigned char buffer = 0;
276
277 if (0 != btv->i2c_rc)
278 return -1;
279 if (bttv_verbose && NULL != probe_for)
280 pr_info("%d: i2c: checking for %s @ 0x%02x... ",
281 btv->c.nr, probe_for, addr);
282 btv->i2c_client.addr = addr >> 1;
283 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
284 if (NULL != probe_for) {
285 if (bttv_verbose)
286 pr_cont("not found\n");
287 } else
288 pr_warn("%d: i2c read 0x%x: error\n",
289 btv->c.nr, addr);
290 return -1;
291 }
292 if (bttv_verbose && NULL != probe_for)
293 pr_cont("found\n");
294 return buffer;
295}
296
297
298int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
299 unsigned char b2, int both)
300{
301 unsigned char buffer[2];
302 int bytes = both ? 2 : 1;
303
304 if (0 != btv->i2c_rc)
305 return -1;
306 btv->i2c_client.addr = addr >> 1;
307 buffer[0] = b1;
308 buffer[1] = b2;
309 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
310 return -1;
311 return 0;
312}
313
314
315void bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
316{
317 memset(eedata, 0, 256);
318 if (0 != btv->i2c_rc)
319 return;
320 btv->i2c_client.addr = addr >> 1;
321 tveeprom_read(&btv->i2c_client, eedata, 256);
322}
323
324static char *i2c_devs[128] = {
325 [ 0x1c >> 1 ] = "lgdt330x",
326 [ 0x30 >> 1 ] = "IR (hauppauge)",
327 [ 0x80 >> 1 ] = "msp34xx",
328 [ 0x86 >> 1 ] = "tda9887",
329 [ 0xa0 >> 1 ] = "eeprom",
330 [ 0xc0 >> 1 ] = "tuner (analog)",
331 [ 0xc2 >> 1 ] = "tuner (analog)",
332};
333
334static void do_i2c_scan(char *name, struct i2c_client *c)
335{
336 unsigned char buf;
337 int i,rc;
338
339 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
340 c->addr = i;
341 rc = i2c_master_recv(c,&buf,0);
342 if (rc < 0)
343 continue;
344 pr_info("%s: i2c scan: found device @ 0x%x [%s]\n",
345 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
346 }
347}
348
349
350int init_bttv_i2c(struct bttv *btv)
351{
352 strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
353
354 if (i2c_hw)
355 btv->use_i2c_hw = 1;
356 if (btv->use_i2c_hw) {
357
358 strlcpy(btv->c.i2c_adap.name, "bt878",
359 sizeof(btv->c.i2c_adap.name));
360 btv->c.i2c_adap.algo = &bttv_algo;
361 } else {
362
363
364 if (i2c_udelay<5)
365 i2c_udelay=5;
366
367 strlcpy(btv->c.i2c_adap.name, "bttv",
368 sizeof(btv->c.i2c_adap.name));
369 btv->i2c_algo = bttv_i2c_algo_bit_template;
370 btv->i2c_algo.udelay = i2c_udelay;
371 btv->i2c_algo.data = btv;
372 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
373 }
374 btv->c.i2c_adap.owner = THIS_MODULE;
375
376 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
377 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
378 "bt%d #%d [%s]", btv->id, btv->c.nr,
379 btv->use_i2c_hw ? "hw" : "sw");
380
381 i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
382 btv->i2c_client.adapter = &btv->c.i2c_adap;
383
384
385 if (btv->use_i2c_hw) {
386 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
387 } else {
388 bttv_bit_setscl(btv,1);
389 bttv_bit_setsda(btv,1);
390 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
391 }
392 if (0 == btv->i2c_rc && i2c_scan)
393 do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
394
395 return btv->i2c_rc;
396}
397
398int fini_bttv_i2c(struct bttv *btv)
399{
400 if (btv->i2c_rc == 0)
401 i2c_del_adapter(&btv->c.i2c_adap);
402
403 return 0;
404}
405
