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24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/module.h>
27#include <linux/i2c.h>
28#include "cx25821.h"
29
30static unsigned int i2c_debug;
31module_param(i2c_debug, int, 0644);
32MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
33
34static unsigned int i2c_scan;
35module_param(i2c_scan, int, 0444);
36MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
37
38#define dprintk(level, fmt, arg...) \
39do { \
40 if (i2c_debug >= level) \
41 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \
42} while (0)
43
44#define I2C_WAIT_DELAY 32
45#define I2C_WAIT_RETRY 64
46
47#define I2C_EXTEND (1 << 3)
48#define I2C_NOSTOP (1 << 4)
49
50static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
51{
52 struct cx25821_i2c *bus = i2c_adap->algo_data;
53 struct cx25821_dev *dev = bus->dev;
54 return cx_read(bus->reg_stat) & 0x01;
55}
56
57static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
58{
59 struct cx25821_i2c *bus = i2c_adap->algo_data;
60 struct cx25821_dev *dev = bus->dev;
61 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
62}
63
64static int i2c_wait_done(struct i2c_adapter *i2c_adap)
65{
66 int count;
67
68 for (count = 0; count < I2C_WAIT_RETRY; count++) {
69 if (!i2c_is_busy(i2c_adap))
70 break;
71 udelay(I2C_WAIT_DELAY);
72 }
73
74 if (I2C_WAIT_RETRY == count)
75 return 0;
76
77 return 1;
78}
79
80static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
81 const struct i2c_msg *msg, int joined_rlen)
82{
83 struct cx25821_i2c *bus = i2c_adap->algo_data;
84 struct cx25821_dev *dev = bus->dev;
85 u32 wdata, addr, ctrl;
86 int retval, cnt;
87
88 if (joined_rlen)
89 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
90 msg->len, joined_rlen);
91 else
92 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
93
94
95 if (msg->len == 0) {
96 cx_write(bus->reg_addr, msg->addr << 25);
97 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
98
99 if (!i2c_wait_done(i2c_adap))
100 return -EIO;
101
102 if (!i2c_slave_did_ack(i2c_adap))
103 return -EIO;
104
105 dprintk(1, "%s(): returns 0\n", __func__);
106 return 0;
107 }
108
109
110 addr = (msg->addr << 25) | msg->buf[0];
111 wdata = msg->buf[0];
112
113 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
114
115 if (msg->len > 1)
116 ctrl |= I2C_NOSTOP | I2C_EXTEND;
117 else if (joined_rlen)
118 ctrl |= I2C_NOSTOP;
119
120 cx_write(bus->reg_addr, addr);
121 cx_write(bus->reg_wdata, wdata);
122 cx_write(bus->reg_ctrl, ctrl);
123
124 retval = i2c_wait_done(i2c_adap);
125 if (retval < 0)
126 goto err;
127
128 if (retval == 0)
129 goto eio;
130
131 if (i2c_debug) {
132 if (!(ctrl & I2C_NOSTOP))
133 printk(" >\n");
134 }
135
136 for (cnt = 1; cnt < msg->len; cnt++) {
137
138 wdata = msg->buf[cnt];
139 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
140
141 if (cnt < msg->len - 1)
142 ctrl |= I2C_NOSTOP | I2C_EXTEND;
143 else if (joined_rlen)
144 ctrl |= I2C_NOSTOP;
145
146 cx_write(bus->reg_addr, addr);
147 cx_write(bus->reg_wdata, wdata);
148 cx_write(bus->reg_ctrl, ctrl);
149
150 retval = i2c_wait_done(i2c_adap);
151 if (retval < 0)
152 goto err;
153
154 if (retval == 0)
155 goto eio;
156
157 if (i2c_debug) {
158 dprintk(1, " %02x", msg->buf[cnt]);
159 if (!(ctrl & I2C_NOSTOP))
160 dprintk(1, " >\n");
161 }
162 }
163
164 return msg->len;
165
166eio:
167 retval = -EIO;
168err:
169 if (i2c_debug)
170 pr_err(" ERR: %d\n", retval);
171 return retval;
172}
173
174static int i2c_readbytes(struct i2c_adapter *i2c_adap,
175 const struct i2c_msg *msg, int joined)
176{
177 struct cx25821_i2c *bus = i2c_adap->algo_data;
178 struct cx25821_dev *dev = bus->dev;
179 u32 ctrl, cnt;
180 int retval;
181
182 if (i2c_debug && !joined)
183 dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len);
184
185
186 if (msg->len == 0) {
187 cx_write(bus->reg_addr, msg->addr << 25);
188 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
189 if (!i2c_wait_done(i2c_adap))
190 return -EIO;
191 if (!i2c_slave_did_ack(i2c_adap))
192 return -EIO;
193
194 dprintk(1, "%s(): returns 0\n", __func__);
195 return 0;
196 }
197
198 if (i2c_debug) {
199 if (joined)
200 dprintk(1, " R");
201 else
202 dprintk(1, " <R %02x", (msg->addr << 1) + 1);
203 }
204
205 for (cnt = 0; cnt < msg->len; cnt++) {
206
207 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
208
209 if (cnt < msg->len - 1)
210 ctrl |= I2C_NOSTOP | I2C_EXTEND;
211
212 cx_write(bus->reg_addr, msg->addr << 25);
213 cx_write(bus->reg_ctrl, ctrl);
214
215 retval = i2c_wait_done(i2c_adap);
216 if (retval < 0)
217 goto err;
218 if (retval == 0)
219 goto eio;
220 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
221
222 if (i2c_debug) {
223 dprintk(1, " %02x", msg->buf[cnt]);
224 if (!(ctrl & I2C_NOSTOP))
225 dprintk(1, " >\n");
226 }
227 }
228
229 return msg->len;
230eio:
231 retval = -EIO;
232err:
233 if (i2c_debug)
234 pr_err(" ERR: %d\n", retval);
235 return retval;
236}
237
238static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
239{
240 struct cx25821_i2c *bus = i2c_adap->algo_data;
241 struct cx25821_dev *dev = bus->dev;
242 int i, retval = 0;
243
244 dprintk(1, "%s(num = %d)\n", __func__, num);
245
246 for (i = 0; i < num; i++) {
247 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
248 __func__, num, msgs[i].addr, msgs[i].len);
249
250 if (msgs[i].flags & I2C_M_RD) {
251
252 retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
253 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
254 msgs[i].addr == msgs[i + 1].addr) {
255
256 retval = i2c_sendbytes(i2c_adap, &msgs[i],
257 msgs[i + 1].len);
258
259 if (retval < 0)
260 goto err;
261 i++;
262 retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
263 } else {
264
265 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
266 }
267
268 if (retval < 0)
269 goto err;
270 }
271 return num;
272
273err:
274 return retval;
275}
276
277
278static u32 cx25821_functionality(struct i2c_adapter *adap)
279{
280 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C | I2C_FUNC_SMBUS_WORD_DATA |
281 I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA;
282}
283
284static struct i2c_algorithm cx25821_i2c_algo_template = {
285 .master_xfer = i2c_xfer,
286 .functionality = cx25821_functionality,
287#ifdef NEED_ALGO_CONTROL
288 .algo_control = dummy_algo_control,
289#endif
290};
291
292static struct i2c_adapter cx25821_i2c_adap_template = {
293 .name = "cx25821",
294 .owner = THIS_MODULE,
295 .algo = &cx25821_i2c_algo_template,
296};
297
298static struct i2c_client cx25821_i2c_client_template = {
299 .name = "cx25821 internal",
300};
301
302
303int cx25821_i2c_register(struct cx25821_i2c *bus)
304{
305 struct cx25821_dev *dev = bus->dev;
306
307 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
308
309 bus->i2c_adap = cx25821_i2c_adap_template;
310 bus->i2c_client = cx25821_i2c_client_template;
311 bus->i2c_adap.dev.parent = &dev->pci->dev;
312
313 strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
314
315 bus->i2c_adap.algo_data = bus;
316 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
317 i2c_add_adapter(&bus->i2c_adap);
318
319 bus->i2c_client.adapter = &bus->i2c_adap;
320
321
322 bus->i2c_client.addr = (0x88 >> 1);
323
324 return bus->i2c_rc;
325}
326
327int cx25821_i2c_unregister(struct cx25821_i2c *bus)
328{
329 i2c_del_adapter(&bus->i2c_adap);
330 return 0;
331}
332
333#if 0
334static void cx25821_av_clk(struct cx25821_dev *dev, int enable)
335{
336
337 char buffer[3];
338 struct i2c_msg msg;
339 dprintk(1, "%s(enabled = %d)\n", __func__, enable);
340
341
342 buffer[0] = 0x01;
343 buffer[1] = 0x44;
344 if (enable == 1)
345 buffer[2] = 0x05;
346 else
347 buffer[2] = 0x00;
348
349 msg.addr = 0x44;
350 msg.flags = I2C_M_TEN;
351 msg.len = 3;
352 msg.buf = buffer;
353
354 i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1);
355}
356#endif
357
358int cx25821_i2c_read(struct cx25821_i2c *bus, u16 reg_addr, int *value)
359{
360 struct i2c_client *client = &bus->i2c_client;
361 int v = 0;
362 u8 addr[2] = { 0, 0 };
363 u8 buf[4] = { 0, 0, 0, 0 };
364
365 struct i2c_msg msgs[2] = {
366 {
367 .addr = client->addr,
368 .flags = 0,
369 .len = 2,
370 .buf = addr,
371 }, {
372 .addr = client->addr,
373 .flags = I2C_M_RD,
374 .len = 4,
375 .buf = buf,
376 }
377 };
378
379 addr[0] = (reg_addr >> 8);
380 addr[1] = (reg_addr & 0xff);
381 msgs[0].addr = 0x44;
382 msgs[1].addr = 0x44;
383
384 i2c_xfer(client->adapter, msgs, 2);
385
386 v = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
387 *value = v;
388
389 return v;
390}
391
392int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value)
393{
394 struct i2c_client *client = &bus->i2c_client;
395 int retval = 0;
396 u8 buf[6] = { 0, 0, 0, 0, 0, 0 };
397
398 struct i2c_msg msgs[1] = {
399 {
400 .addr = client->addr,
401 .flags = 0,
402 .len = 6,
403 .buf = buf,
404 }
405 };
406
407 buf[0] = reg_addr >> 8;
408 buf[1] = reg_addr & 0xff;
409 buf[5] = (value >> 24) & 0xff;
410 buf[4] = (value >> 16) & 0xff;
411 buf[3] = (value >> 8) & 0xff;
412 buf[2] = value & 0xff;
413 client->flags = 0;
414 msgs[0].addr = 0x44;
415
416 retval = i2c_xfer(client->adapter, msgs, 1);
417
418 return retval;
419}
420