[go: nahoru, domu]
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
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/init.h>
21#include <linux/delay.h>
22#include <asm/io.h>
23
24#include "cx23885.h"
25
26#include <media/v4l2-common.h>
27
28static unsigned int i2c_debug;
29module_param(i2c_debug, int, 0644);
30MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
31
32static unsigned int i2c_scan;
33module_param(i2c_scan, int, 0444);
34MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
35
36#define dprintk(level, fmt, arg...)\
37	do { if (i2c_debug >= level)\
38		printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
39	} while (0)
40
41#define I2C_WAIT_DELAY 32
42#define I2C_WAIT_RETRY 64
43
44#define I2C_EXTEND  (1 << 3)
45#define I2C_NOSTOP  (1 << 4)
46
47static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
48{
49	struct cx23885_i2c *bus = i2c_adap->algo_data;
50	struct cx23885_dev *dev = bus->dev;
51	return cx_read(bus->reg_stat) & 0x01;
52}
53
54static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
55{
56	struct cx23885_i2c *bus = i2c_adap->algo_data;
57	struct cx23885_dev *dev = bus->dev;
58	return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
59}
60
61static int i2c_wait_done(struct i2c_adapter *i2c_adap)
62{
63	int count;
64
65	for (count = 0; count < I2C_WAIT_RETRY; count++) {
66		if (!i2c_is_busy(i2c_adap))
67			break;
68		udelay(I2C_WAIT_DELAY);
69	}
70
71	if (I2C_WAIT_RETRY == count)
72		return 0;
73
74	return 1;
75}
76
77static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
78			 const struct i2c_msg *msg, int joined_rlen)
79{
80	struct cx23885_i2c *bus = i2c_adap->algo_data;
81	struct cx23885_dev *dev = bus->dev;
82	u32 wdata, addr, ctrl;
83	int retval, cnt;
84
85	if (joined_rlen)
86		dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
87			msg->len, joined_rlen);
88	else
89		dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
90
91	/* Deal with i2c probe functions with zero payload */
92	if (msg->len == 0) {
93		cx_write(bus->reg_addr, msg->addr << 25);
94		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
95		if (!i2c_wait_done(i2c_adap))
96			return -EIO;
97		if (!i2c_slave_did_ack(i2c_adap))
98			return -ENXIO;
99
100		dprintk(1, "%s() returns 0\n", __func__);
101		return 0;
102	}
103
104
105	/* dev, reg + first byte */
106	addr = (msg->addr << 25) | msg->buf[0];
107	wdata = msg->buf[0];
108	ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
109
110	if (msg->len > 1)
111		ctrl |= I2C_NOSTOP | I2C_EXTEND;
112	else if (joined_rlen)
113		ctrl |= I2C_NOSTOP;
114
115	cx_write(bus->reg_addr, addr);
116	cx_write(bus->reg_wdata, wdata);
117	cx_write(bus->reg_ctrl, ctrl);
118
119	if (!i2c_wait_done(i2c_adap))
120		goto eio;
121	if (i2c_debug) {
122		printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
123		if (!(ctrl & I2C_NOSTOP))
124			printk(" >\n");
125	}
126
127	for (cnt = 1; cnt < msg->len; cnt++) {
128		/* following bytes */
129		wdata = msg->buf[cnt];
130		ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
131
132		if (cnt < msg->len - 1)
133			ctrl |= I2C_NOSTOP | I2C_EXTEND;
134		else if (joined_rlen)
135			ctrl |= I2C_NOSTOP;
136
137		cx_write(bus->reg_addr, addr);
138		cx_write(bus->reg_wdata, wdata);
139		cx_write(bus->reg_ctrl, ctrl);
140
141		if (!i2c_wait_done(i2c_adap))
142			goto eio;
143		if (i2c_debug) {
144			dprintk(1, " %02x", msg->buf[cnt]);
145			if (!(ctrl & I2C_NOSTOP))
146				dprintk(1, " >\n");
147		}
148	}
149	return msg->len;
150
151 eio:
152	retval = -EIO;
153	if (i2c_debug)
154		printk(KERN_ERR " ERR: %d\n", retval);
155	return retval;
156}
157
158static int i2c_readbytes(struct i2c_adapter *i2c_adap,
159			 const struct i2c_msg *msg, int joined)
160{
161	struct cx23885_i2c *bus = i2c_adap->algo_data;
162	struct cx23885_dev *dev = bus->dev;
163	u32 ctrl, cnt;
164	int retval;
165
166
167	if (i2c_debug && !joined)
168		dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
169
170	/* Deal with i2c probe functions with zero payload */
171	if (msg->len == 0) {
172		cx_write(bus->reg_addr, msg->addr << 25);
173		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
174		if (!i2c_wait_done(i2c_adap))
175			return -EIO;
176		if (!i2c_slave_did_ack(i2c_adap))
177			return -ENXIO;
178
179
180		dprintk(1, "%s() returns 0\n", __func__);
181		return 0;
182	}
183
184	if (i2c_debug) {
185		if (joined)
186			dprintk(1, " R");
187		else
188			dprintk(1, " <R %02x", (msg->addr << 1) + 1);
189	}
190
191	for (cnt = 0; cnt < msg->len; cnt++) {
192
193		ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
194
195		if (cnt < msg->len - 1)
196			ctrl |= I2C_NOSTOP | I2C_EXTEND;
197
198		cx_write(bus->reg_addr, msg->addr << 25);
199		cx_write(bus->reg_ctrl, ctrl);
200
201		if (!i2c_wait_done(i2c_adap))
202			goto eio;
203		msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
204		if (i2c_debug) {
205			dprintk(1, " %02x", msg->buf[cnt]);
206			if (!(ctrl & I2C_NOSTOP))
207				dprintk(1, " >\n");
208		}
209	}
210	return msg->len;
211
212 eio:
213	retval = -EIO;
214	if (i2c_debug)
215		printk(KERN_ERR " ERR: %d\n", retval);
216	return retval;
217}
218
219static int i2c_xfer(struct i2c_adapter *i2c_adap,
220		    struct i2c_msg *msgs, int num)
221{
222	struct cx23885_i2c *bus = i2c_adap->algo_data;
223	struct cx23885_dev *dev = bus->dev;
224	int i, retval = 0;
225
226	dprintk(1, "%s(num = %d)\n", __func__, num);
227
228	for (i = 0 ; i < num; i++) {
229		dprintk(1, "%s(num = %d) addr = 0x%02x  len = 0x%x\n",
230			__func__, num, msgs[i].addr, msgs[i].len);
231		if (msgs[i].flags & I2C_M_RD) {
232			/* read */
233			retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
234		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
235			   msgs[i].addr == msgs[i + 1].addr) {
236			/* write then read from same address */
237			retval = i2c_sendbytes(i2c_adap, &msgs[i],
238					       msgs[i + 1].len);
239			if (retval < 0)
240				goto err;
241			i++;
242			retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
243		} else {
244			/* write */
245			retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
246		}
247		if (retval < 0)
248			goto err;
249	}
250	return num;
251
252 err:
253	return retval;
254}
255
256static u32 cx23885_functionality(struct i2c_adapter *adap)
257{
258	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
259}
260
261static struct i2c_algorithm cx23885_i2c_algo_template = {
262	.master_xfer	= i2c_xfer,
263	.functionality	= cx23885_functionality,
264};
265
266/* ----------------------------------------------------------------------- */
267
268static struct i2c_adapter cx23885_i2c_adap_template = {
269	.name              = "cx23885",
270	.owner             = THIS_MODULE,
271	.algo              = &cx23885_i2c_algo_template,
272};
273
274static struct i2c_client cx23885_i2c_client_template = {
275	.name	= "cx23885 internal",
276};
277
278static char *i2c_devs[128] = {
279	[0x10 >> 1] = "tda10048",
280	[0x12 >> 1] = "dib7000pc",
281	[0x1c >> 1] = "lgdt3303",
282	[0x86 >> 1] = "tda9887",
283	[0x32 >> 1] = "cx24227",
284	[0x88 >> 1] = "cx25837",
285	[0x84 >> 1] = "tda8295",
286	[0x98 >> 1] = "flatiron",
287	[0xa0 >> 1] = "eeprom",
288	[0xc0 >> 1] = "tuner/mt2131/tda8275",
289	[0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
290	[0xc8 >> 1] = "tuner/xc3028L",
291};
292
293static void do_i2c_scan(char *name, struct i2c_client *c)
294{
295	unsigned char buf;
296	int i, rc;
297
298	for (i = 0; i < 128; i++) {
299		c->addr = i;
300		rc = i2c_master_recv(c, &buf, 0);
301		if (rc < 0)
302			continue;
303		printk(KERN_INFO "%s: i2c scan: found device @ 0x%x  [%s]\n",
304		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
305	}
306}
307
308/* init + register i2c adapter */
309int cx23885_i2c_register(struct cx23885_i2c *bus)
310{
311	struct cx23885_dev *dev = bus->dev;
312
313	dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
314
315	bus->i2c_adap = cx23885_i2c_adap_template;
316	bus->i2c_client = cx23885_i2c_client_template;
317	bus->i2c_adap.dev.parent = &dev->pci->dev;
318
319	strlcpy(bus->i2c_adap.name, bus->dev->name,
320		sizeof(bus->i2c_adap.name));
321
322	bus->i2c_adap.algo_data = bus;
323	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
324	i2c_add_adapter(&bus->i2c_adap);
325
326	bus->i2c_client.adapter = &bus->i2c_adap;
327
328	if (0 == bus->i2c_rc) {
329		dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
330		if (i2c_scan) {
331			printk(KERN_INFO "%s: scan bus %d:\n",
332					dev->name, bus->nr);
333			do_i2c_scan(dev->name, &bus->i2c_client);
334		}
335	} else
336		printk(KERN_WARNING "%s: i2c bus %d register FAILED\n",
337			dev->name, bus->nr);
338
339	/* Instantiate the IR receiver device, if present */
340	if (0 == bus->i2c_rc) {
341		struct i2c_board_info info;
342		const unsigned short addr_list[] = {
343			0x6b, I2C_CLIENT_END
344		};
345
346		memset(&info, 0, sizeof(struct i2c_board_info));
347		strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
348		/* Use quick read command for probe, some IR chips don't
349		 * support writes */
350		i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
351				      i2c_probe_func_quick_read);
352	}
353
354	return bus->i2c_rc;
355}
356
357int cx23885_i2c_unregister(struct cx23885_i2c *bus)
358{
359	i2c_del_adapter(&bus->i2c_adap);
360	return 0;
361}
362
363void cx23885_av_clk(struct cx23885_dev *dev, int enable)
364{
365	/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
366	char buffer[3];
367	struct i2c_msg msg;
368	dprintk(1, "%s(enabled = %d)\n", __func__, enable);
369
370	/* Register 0x144 */
371	buffer[0] = 0x01;
372	buffer[1] = 0x44;
373	if (enable == 1)
374		buffer[2] = 0x05;
375	else
376		buffer[2] = 0x00;
377
378	msg.addr = 0x44;
379	msg.flags = I2C_M_TEN;
380	msg.len = 3;
381	msg.buf = buffer;
382
383	i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
384}
385