1 /*
2 * Driver for the Conexant CX23885 PCIe bridge
3 *
4 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 *
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/init.h>
25 #include <linux/delay.h>
26 #include <asm/io.h>
27
28 #include "cx23885.h"
29
30 #include <media/v4l2-common.h>
31
32 static unsigned int i2c_debug;
33 module_param(i2c_debug, int, 0644);
34 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
35
36 static unsigned int i2c_scan;
37 module_param(i2c_scan, int, 0444);
38 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
39
40 #define dprintk(level, fmt, arg...)\
41 do { if (i2c_debug >= level)\
42 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
43 } while (0)
44
45 #define I2C_WAIT_DELAY 32
46 #define I2C_WAIT_RETRY 64
47
48 #define I2C_EXTEND (1 << 3)
49 #define I2C_NOSTOP (1 << 4)
50
51 static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
52 {
53 struct cx23885_i2c *bus = i2c_adap->algo_data;
54 struct cx23885_dev *dev = bus->dev;
55 return cx_read(bus->reg_stat) & 0x01;
56 }
57
58 static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
59 {
60 struct cx23885_i2c *bus = i2c_adap->algo_data;
61 struct cx23885_dev *dev = bus->dev;
62 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
63 }
64
65 static int i2c_wait_done(struct i2c_adapter *i2c_adap)
66 {
67 int count;
68
69 for (count = 0; count < I2C_WAIT_RETRY; count++) {
70 if (!i2c_is_busy(i2c_adap))
71 break;
72 udelay(I2C_WAIT_DELAY);
73 }
74
75 if (I2C_WAIT_RETRY == count)
76 return 0;
77
78 return 1;
79 }
80
81 static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
82 const struct i2c_msg *msg, int joined_rlen)
83 {
84 struct cx23885_i2c *bus = i2c_adap->algo_data;
85 struct cx23885_dev *dev = bus->dev;
86 u32 wdata, addr, ctrl;
87 int retval, cnt;
88
89 if (joined_rlen)
90 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
91 msg->len, joined_rlen);
92 else
93 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
94
95 /* Deal with i2c probe functions with zero payload */
96 if (msg->len == 0) {
97 cx_write(bus->reg_addr, msg->addr << 25);
98 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
99 if (!i2c_wait_done(i2c_adap))
100 return -EIO;
101 if (!i2c_slave_did_ack(i2c_adap))
102 return -EIO;
103
104 dprintk(1, "%s() returns 0\n", __func__);
105 return 0;
106 }
107
108
109 /* dev, reg + first byte */
110 addr = (msg->addr << 25) | msg->buf[0];
111 wdata = msg->buf[0];
112 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
113
114 if (msg->len > 1)
115 ctrl |= I2C_NOSTOP | I2C_EXTEND;
116 else if (joined_rlen)
117 ctrl |= I2C_NOSTOP;
118
119 cx_write(bus->reg_addr, addr);
120 cx_write(bus->reg_wdata, wdata);
121 cx_write(bus->reg_ctrl, ctrl);
122
123 retval = i2c_wait_done(i2c_adap);
124 if (retval < 0)
125 goto err;
126 if (retval == 0)
127 goto eio;
128 if (i2c_debug) {
129 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
130 if (!(ctrl & I2C_NOSTOP))
131 printk(" >\n");
132 }
133
134 for (cnt = 1; cnt < msg->len; cnt++) {
135 /* following bytes */
136 wdata = msg->buf[cnt];
137 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
138
139 if (cnt < msg->len - 1)
140 ctrl |= I2C_NOSTOP | I2C_EXTEND;
141 else if (joined_rlen)
142 ctrl |= I2C_NOSTOP;
143
144 cx_write(bus->reg_addr, addr);
145 cx_write(bus->reg_wdata, wdata);
146 cx_write(bus->reg_ctrl, ctrl);
147
148 retval = i2c_wait_done(i2c_adap);
149 if (retval < 0)
150 goto err;
151 if (retval == 0)
152 goto eio;
153 if (i2c_debug) {
154 dprintk(1, " %02x", msg->buf[cnt]);
155 if (!(ctrl & I2C_NOSTOP))
156 dprintk(1, " >\n");
157 }
158 }
159 return msg->len;
160
161 eio:
162 retval = -EIO;
163 err:
164 if (i2c_debug)
165 printk(KERN_ERR " ERR: %d\n", retval);
166 return retval;
167 }
168
169 static int i2c_readbytes(struct i2c_adapter *i2c_adap,
170 const struct i2c_msg *msg, int joined)
171 {
172 struct cx23885_i2c *bus = i2c_adap->algo_data;
173 struct cx23885_dev *dev = bus->dev;
174 u32 ctrl, cnt;
175 int retval;
176
177
178 if (i2c_debug && !joined)
179 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
180
181 /* Deal with i2c probe functions with zero payload */
182 if (msg->len == 0) {
183 cx_write(bus->reg_addr, msg->addr << 25);
184 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
185 if (!i2c_wait_done(i2c_adap))
186 return -EIO;
187 if (!i2c_slave_did_ack(i2c_adap))
188 return -EIO;
189
190
191 dprintk(1, "%s() returns 0\n", __func__);
192 return 0;
193 }
194
195 if (i2c_debug) {
196 if (joined)
197 dprintk(1, " R");
198 else
199 dprintk(1, " <R %02x", (msg->addr << 1) + 1);
200 }
201
202 for (cnt = 0; cnt < msg->len; cnt++) {
203
204 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
205
206 if (cnt < msg->len - 1)
207 ctrl |= I2C_NOSTOP | I2C_EXTEND;
208
209 cx_write(bus->reg_addr, msg->addr << 25);
210 cx_write(bus->reg_ctrl, ctrl);
211
212 retval = i2c_wait_done(i2c_adap);
213 if (retval < 0)
214 goto err;
215 if (retval == 0)
216 goto eio;
217 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
218 if (i2c_debug) {
219 dprintk(1, " %02x", msg->buf[cnt]);
220 if (!(ctrl & I2C_NOSTOP))
221 dprintk(1, " >\n");
222 }
223 }
224 return msg->len;
225
226 eio:
227 retval = -EIO;
228 err:
229 if (i2c_debug)
230 printk(KERN_ERR " ERR: %d\n", retval);
231 return retval;
232 }
233
234 static int i2c_xfer(struct i2c_adapter *i2c_adap,
235 struct i2c_msg *msgs, int num)
236 {
237 struct cx23885_i2c *bus = i2c_adap->algo_data;
238 struct cx23885_dev *dev = bus->dev;
239 int i, retval = 0;
240
241 dprintk(1, "%s(num = %d)\n", __func__, num);
242
243 for (i = 0 ; i < num; i++) {
244 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
245 __func__, num, msgs[i].addr, msgs[i].len);
246 if (msgs[i].flags & I2C_M_RD) {
247 /* read */
248 retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
249 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
250 msgs[i].addr == msgs[i + 1].addr) {
251 /* write then read from same address */
252 retval = i2c_sendbytes(i2c_adap, &msgs[i],
253 msgs[i + 1].len);
254 if (retval < 0)
255 goto err;
256 i++;
257 retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
258 } else {
259 /* write */
260 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
261 }
262 if (retval < 0)
263 goto err;
264 }
265 return num;
266
267 err:
268 return retval;
269 }
270
271 static u32 cx23885_functionality(struct i2c_adapter *adap)
272 {
273 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
274 }
275
276 static struct i2c_algorithm cx23885_i2c_algo_template = {
277 .master_xfer = i2c_xfer,
278 .functionality = cx23885_functionality,
279 };
280
281 /* ----------------------------------------------------------------------- */
282
283 static struct i2c_adapter cx23885_i2c_adap_template = {
284 .name = "cx23885",
285 .owner = THIS_MODULE,
286 .id = I2C_HW_B_CX23885,
287 .algo = &cx23885_i2c_algo_template,
288 };
289
290 static struct i2c_client cx23885_i2c_client_template = {
291 .name = "cx23885 internal",
292 };
293
294 static char *i2c_devs[128] = {
295 [0x10 >> 1] = "tda10048",
296 [0x12 >> 1] = "dib7000pc",
297 [0x1c >> 1] = "lgdt3303",
298 [0x86 >> 1] = "tda9887",
299 [0x32 >> 1] = "cx24227",
300 [0x88 >> 1] = "cx25837",
301 [0x84 >> 1] = "tda8295",
302 [0xa0 >> 1] = "eeprom",
303 [0xc0 >> 1] = "tuner/mt2131/tda8275",
304 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
305 [0xc8 >> 1] = "tuner/xc3028L",
306 };
307
308 static void do_i2c_scan(char *name, struct i2c_client *c)
309 {
310 unsigned char buf;
311 int i, rc;
312
313 for (i = 0; i < 128; i++) {
314 c->addr = i;
315 rc = i2c_master_recv(c, &buf, 0);
316 if (rc < 0)
317 continue;
318 printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
319 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
320 }
321 }
322
323 /* init + register i2c algo-bit adapter */
324 int cx23885_i2c_register(struct cx23885_i2c *bus)
325 {
326 struct cx23885_dev *dev = bus->dev;
327
328 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
329
330 memcpy(&bus->i2c_adap, &cx23885_i2c_adap_template,
331 sizeof(bus->i2c_adap));
332 memcpy(&bus->i2c_algo, &cx23885_i2c_algo_template,
333 sizeof(bus->i2c_algo));
334 memcpy(&bus->i2c_client, &cx23885_i2c_client_template,
335 sizeof(bus->i2c_client));
336
337 bus->i2c_adap.dev.parent = &dev->pci->dev;
338
339 strlcpy(bus->i2c_adap.name, bus->dev->name,
340 sizeof(bus->i2c_adap.name));
341
342 bus->i2c_algo.data = bus;
343 bus->i2c_adap.algo_data = bus;
344 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
345 i2c_add_adapter(&bus->i2c_adap);
346
347 bus->i2c_client.adapter = &bus->i2c_adap;
348
349 if (0 == bus->i2c_rc) {
350 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
351 if (i2c_scan) {
352 printk(KERN_INFO "%s: scan bus %d:\n",
353 dev->name, bus->nr);
354 do_i2c_scan(dev->name, &bus->i2c_client);
355 }
356 } else
357 printk(KERN_WARNING "%s: i2c bus %d register FAILED\n",
358 dev->name, bus->nr);
359
360 /* Instantiate the IR receiver device, if present */
361 if (0 == bus->i2c_rc) {
362 struct i2c_board_info info;
363 const unsigned short addr_list[] = {
364 0x6b, I2C_CLIENT_END
365 };
366
367 memset(&info, 0, sizeof(struct i2c_board_info));
368 strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
369 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list);
370 }
371
372 return bus->i2c_rc;
373 }
374
375 int cx23885_i2c_unregister(struct cx23885_i2c *bus)
376 {
377 i2c_del_adapter(&bus->i2c_adap);
378 return 0;
379 }
380
381 void cx23885_av_clk(struct cx23885_dev *dev, int enable)
382 {
383 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */
384 char buffer[3];
385 struct i2c_msg msg;
386 dprintk(1, "%s(enabled = %d)\n", __func__, enable);
387
388 /* Register 0x144 */
389 buffer[0] = 0x01;
390 buffer[1] = 0x44;
391 if (enable == 1)
392 buffer[2] = 0x05;
393 else
394 buffer[2] = 0x00;
395
396 msg.addr = 0x44;
397 msg.flags = I2C_M_TEN;
398 msg.len = 3;
399 msg.buf = buffer;
400
401 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
402 }
403
404 /* ----------------------------------------------------------------------- */
405
406 /*
407 * Local variables:
408 * c-basic-offset: 8
409 * End:
410 */
411
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