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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
32static unsigned int i2c_debug;
33module_param(i2c_debug, int, 0644);
34MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
35
36static unsigned int i2c_scan;
37module_param(i2c_scan, int, 0444);
38MODULE_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
51static 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
58static 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
65static 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
81static 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 -ENXIO;
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 if (!i2c_wait_done(i2c_adap))
124 goto eio;
125 if (i2c_debug) {
126 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
127 if (!(ctrl & I2C_NOSTOP))
128 printk(" >\n");
129 }
130
131 for (cnt = 1; cnt < msg->len; cnt++) {
132 /* following bytes */
133 wdata = msg->buf[cnt];
134 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
135
136 if (cnt < msg->len - 1)
137 ctrl |= I2C_NOSTOP | I2C_EXTEND;
138 else if (joined_rlen)
139 ctrl |= I2C_NOSTOP;
140
141 cx_write(bus->reg_addr, addr);
142 cx_write(bus->reg_wdata, wdata);
143 cx_write(bus->reg_ctrl, ctrl);
144
145 if (!i2c_wait_done(i2c_adap))
146 goto eio;
147 if (i2c_debug) {
148 dprintk(1, " %02x", msg->buf[cnt]);
149 if (!(ctrl & I2C_NOSTOP))
150 dprintk(1, " >\n");
151 }
152 }
153 return msg->len;
154
155 eio:
156 retval = -EIO;
157 if (i2c_debug)
158 printk(KERN_ERR " ERR: %d\n", retval);
159 return retval;
160}
161
162static int i2c_readbytes(struct i2c_adapter *i2c_adap,
163 const struct i2c_msg *msg, int joined)
164{
165 struct cx23885_i2c *bus = i2c_adap->algo_data;
166 struct cx23885_dev *dev = bus->dev;
167 u32 ctrl, cnt;
168 int retval;
169
170
171 if (i2c_debug && !joined)
172 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
173
174 /* Deal with i2c probe functions with zero payload */
175 if (msg->len == 0) {
176 cx_write(bus->reg_addr, msg->addr << 25);
177 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
178 if (!i2c_wait_done(i2c_adap))
179 return -EIO;
180 if (!i2c_slave_did_ack(i2c_adap))
181 return -ENXIO;
182
183
184 dprintk(1, "%s() returns 0\n", __func__);
185 return 0;
186 }
187
188 if (i2c_debug) {
189 if (joined)
190 dprintk(1, " R");
191 else
192 dprintk(1, " <R %02x", (msg->addr << 1) + 1);
193 }
194
195 for (cnt = 0; cnt < msg->len; cnt++) {
196
197 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
198
199 if (cnt < msg->len - 1)
200 ctrl |= I2C_NOSTOP | I2C_EXTEND;
201
202 cx_write(bus->reg_addr, msg->addr << 25);
203 cx_write(bus->reg_ctrl, ctrl);
204
205 if (!i2c_wait_done(i2c_adap))
206 goto eio;
207 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
208 if (i2c_debug) {
209 dprintk(1, " %02x", msg->buf[cnt]);
210 if (!(ctrl & I2C_NOSTOP))
211 dprintk(1, " >\n");
212 }
213 }
214 return msg->len;
215
216 eio:
217 retval = -EIO;
218 if (i2c_debug)
219 printk(KERN_ERR " ERR: %d\n", retval);
220 return retval;
221}
222
223static int i2c_xfer(struct i2c_adapter *i2c_adap,
224 struct i2c_msg *msgs, int num)
225{
226 struct cx23885_i2c *bus = i2c_adap->algo_data;
227 struct cx23885_dev *dev = bus->dev;
228 int i, retval = 0;
229
230 dprintk(1, "%s(num = %d)\n", __func__, num);
231
232 for (i = 0 ; i < num; i++) {
233 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
234 __func__, num, msgs[i].addr, msgs[i].len);
235 if (msgs[i].flags & I2C_M_RD) {
236 /* read */
237 retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
238 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
239 msgs[i].addr == msgs[i + 1].addr) {
240 /* write then read from same address */
241 retval = i2c_sendbytes(i2c_adap, &msgs[i],
242 msgs[i + 1].len);
243 if (retval < 0)
244 goto err;
245 i++;
246 retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
247 } else {
248 /* write */
249 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
250 }
251 if (retval < 0)
252 goto err;
253 }
254 return num;
255
256 err:
257 return retval;
258}
259
260static u32 cx23885_functionality(struct i2c_adapter *adap)
261{
262 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
263}
264
265static struct i2c_algorithm cx23885_i2c_algo_template = {
266 .master_xfer = i2c_xfer,
267 .functionality = cx23885_functionality,
268};
269
270/* ----------------------------------------------------------------------- */
271
272static struct i2c_adapter cx23885_i2c_adap_template = {
273 .name = "cx23885",
274 .owner = THIS_MODULE,
275 .algo = &cx23885_i2c_algo_template,
276};
277
278static struct i2c_client cx23885_i2c_client_template = {
279 .name = "cx23885 internal",
280};
281
282static char *i2c_devs[128] = {
283 [0x10 >> 1] = "tda10048",
284 [0x12 >> 1] = "dib7000pc",
285 [0x1c >> 1] = "lgdt3303",
286 [0x86 >> 1] = "tda9887",
287 [0x32 >> 1] = "cx24227",
288 [0x88 >> 1] = "cx25837",
289 [0x84 >> 1] = "tda8295",
290 [0x98 >> 1] = "flatiron",
291 [0xa0 >> 1] = "eeprom",
292 [0xc0 >> 1] = "tuner/mt2131/tda8275",
293 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
294 [0xc8 >> 1] = "tuner/xc3028L",
295};
296
297static void do_i2c_scan(char *name, struct i2c_client *c)
298{
299 unsigned char buf;
300 int i, rc;
301
302 for (i = 0; i < 128; i++) {
303 c->addr = i;
304 rc = i2c_master_recv(c, &buf, 0);
305 if (rc < 0)
306 continue;
307 printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
308 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
309 }
310}
311
312/* init + register i2c adapter */
313int cx23885_i2c_register(struct cx23885_i2c *bus)
314{
315 struct cx23885_dev *dev = bus->dev;
316
317 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
318
319 memcpy(&bus->i2c_adap, &cx23885_i2c_adap_template,
320 sizeof(bus->i2c_adap));
321 memcpy(&bus->i2c_algo, &cx23885_i2c_algo_template,
322 sizeof(bus->i2c_algo));
323 memcpy(&bus->i2c_client, &cx23885_i2c_client_template,
324 sizeof(bus->i2c_client));
325
326 bus->i2c_adap.dev.parent = &dev->pci->dev;
327
328 strlcpy(bus->i2c_adap.name, bus->dev->name,
329 sizeof(bus->i2c_adap.name));
330
331 bus->i2c_algo.data = bus;
332 bus->i2c_adap.algo_data = bus;
333 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
334 i2c_add_adapter(&bus->i2c_adap);
335
336 bus->i2c_client.adapter = &bus->i2c_adap;
337
338 if (0 == bus->i2c_rc) {
339 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
340 if (i2c_scan) {
341 printk(KERN_INFO "%s: scan bus %d:\n",
342 dev->name, bus->nr);
343 do_i2c_scan(dev->name, &bus->i2c_client);
344 }
345 } else
346 printk(KERN_WARNING "%s: i2c bus %d register FAILED\n",
347 dev->name, bus->nr);
348
349 /* Instantiate the IR receiver device, if present */
350 if (0 == bus->i2c_rc) {
351 struct i2c_board_info info;
352 const unsigned short addr_list[] = {
353 0x6b, I2C_CLIENT_END
354 };
355
356 memset(&info, 0, sizeof(struct i2c_board_info));
357 strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
358 /* Use quick read command for probe, some IR chips don't
359 * support writes */
360 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
361 i2c_probe_func_quick_read);
362 }
363
364 return bus->i2c_rc;
365}
366
367int cx23885_i2c_unregister(struct cx23885_i2c *bus)
368{
369 i2c_del_adapter(&bus->i2c_adap);
370 return 0;
371}
372
373void cx23885_av_clk(struct cx23885_dev *dev, int enable)
374{
375 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */
376 char buffer[3];
377 struct i2c_msg msg;
378 dprintk(1, "%s(enabled = %d)\n", __func__, enable);
379
380 /* Register 0x144 */
381 buffer[0] = 0x01;
382 buffer[1] = 0x44;
383 if (enable == 1)
384 buffer[2] = 0x05;
385 else
386 buffer[2] = 0x00;
387
388 msg.addr = 0x44;
389 msg.flags = I2C_M_TEN;
390 msg.len = 3;
391 msg.buf = buffer;
392
393 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
394}
395
396/* ----------------------------------------------------------------------- */
397
398/*
399 * Local variables:
400 * c-basic-offset: 8
401 * End:
402 */