2 * Driver for the Conexant CX23885 PCIe bridge
4 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
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.
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
15 * GNU General Public License for more details.
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
22 #include <linux/init.h>
23 #include <linux/delay.h>
26 #include <media/v4l2-common.h>
28 static unsigned int i2c_debug;
29 module_param(i2c_debug, int, 0644);
30 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
32 static unsigned int i2c_scan;
33 module_param(i2c_scan, int, 0444);
34 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
36 #define dprintk(level, fmt, arg...)\
37 do { if (i2c_debug >= level)\
38 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \
42 #define I2C_WAIT_DELAY 32
43 #define I2C_WAIT_RETRY 64
45 #define I2C_EXTEND (1 << 3)
46 #define I2C_NOSTOP (1 << 4)
48 static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
50 struct cx23885_i2c *bus = i2c_adap->algo_data;
51 struct cx23885_dev *dev = bus->dev;
52 return cx_read(bus->reg_stat) & 0x01;
55 static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
57 struct cx23885_i2c *bus = i2c_adap->algo_data;
58 struct cx23885_dev *dev = bus->dev;
59 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
62 static int i2c_wait_done(struct i2c_adapter *i2c_adap)
66 for (count = 0; count < I2C_WAIT_RETRY; count++) {
67 if (!i2c_is_busy(i2c_adap))
69 udelay(I2C_WAIT_DELAY);
72 if (I2C_WAIT_RETRY == count)
78 static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
79 const struct i2c_msg *msg, int joined_rlen)
81 struct cx23885_i2c *bus = i2c_adap->algo_data;
82 struct cx23885_dev *dev = bus->dev;
83 u32 wdata, addr, ctrl;
87 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
88 msg->len, joined_rlen);
90 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
92 /* Deal with i2c probe functions with zero payload */
94 cx_write(bus->reg_addr, msg->addr << 25);
95 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
96 if (!i2c_wait_done(i2c_adap))
98 if (!i2c_slave_did_ack(i2c_adap))
101 dprintk(1, "%s() returns 0\n", __func__);
106 /* dev, reg + first byte */
107 addr = (msg->addr << 25) | msg->buf[0];
109 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
112 ctrl |= I2C_NOSTOP | I2C_EXTEND;
113 else if (joined_rlen)
116 cx_write(bus->reg_addr, addr);
117 cx_write(bus->reg_wdata, wdata);
118 cx_write(bus->reg_ctrl, ctrl);
120 if (!i2c_wait_done(i2c_adap))
123 printk(KERN_DEBUG " <W %02x %02x", msg->addr << 1, msg->buf[0]);
124 if (!(ctrl & I2C_NOSTOP))
128 for (cnt = 1; cnt < msg->len; cnt++) {
129 /* following bytes */
130 wdata = msg->buf[cnt];
131 ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
133 if (cnt < msg->len - 1)
134 ctrl |= I2C_NOSTOP | I2C_EXTEND;
135 else if (joined_rlen)
138 cx_write(bus->reg_addr, addr);
139 cx_write(bus->reg_wdata, wdata);
140 cx_write(bus->reg_ctrl, ctrl);
142 if (!i2c_wait_done(i2c_adap))
145 pr_cont(" %02x", msg->buf[cnt]);
146 if (!(ctrl & I2C_NOSTOP))
155 pr_err(" ERR: %d\n", retval);
159 static int i2c_readbytes(struct i2c_adapter *i2c_adap,
160 const struct i2c_msg *msg, int joined)
162 struct cx23885_i2c *bus = i2c_adap->algo_data;
163 struct cx23885_dev *dev = bus->dev;
168 if (i2c_debug && !joined)
169 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
171 /* Deal with i2c probe functions with zero payload */
173 cx_write(bus->reg_addr, msg->addr << 25);
174 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
175 if (!i2c_wait_done(i2c_adap))
177 if (!i2c_slave_did_ack(i2c_adap))
181 dprintk(1, "%s() returns 0\n", __func__);
189 dprintk(1, " <R %02x", (msg->addr << 1) + 1);
192 for (cnt = 0; cnt < msg->len; cnt++) {
194 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
196 if (cnt < msg->len - 1)
197 ctrl |= I2C_NOSTOP | I2C_EXTEND;
199 cx_write(bus->reg_addr, msg->addr << 25);
200 cx_write(bus->reg_ctrl, ctrl);
202 if (!i2c_wait_done(i2c_adap))
204 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
206 dprintk(1, " %02x", msg->buf[cnt]);
207 if (!(ctrl & I2C_NOSTOP))
216 pr_err(" ERR: %d\n", retval);
220 static int i2c_xfer(struct i2c_adapter *i2c_adap,
221 struct i2c_msg *msgs, int num)
225 dprintk(1, "%s(num = %d)\n", __func__, num);
227 for (i = 0 ; i < num; i++) {
228 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
229 __func__, num, msgs[i].addr, msgs[i].len);
230 if (msgs[i].flags & I2C_M_RD) {
232 retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
233 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
234 msgs[i].addr == msgs[i + 1].addr) {
235 /* write then read from same address */
236 retval = i2c_sendbytes(i2c_adap, &msgs[i],
241 retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
244 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
255 static u32 cx23885_functionality(struct i2c_adapter *adap)
257 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
260 static const struct i2c_algorithm cx23885_i2c_algo_template = {
261 .master_xfer = i2c_xfer,
262 .functionality = cx23885_functionality,
265 /* ----------------------------------------------------------------------- */
267 static const struct i2c_adapter cx23885_i2c_adap_template = {
269 .owner = THIS_MODULE,
270 .algo = &cx23885_i2c_algo_template,
273 static struct i2c_client cx23885_i2c_client_template = {
274 .name = "cx23885 internal",
277 static char *i2c_devs[128] = {
278 [0x10 >> 1] = "tda10048",
279 [0x12 >> 1] = "dib7000pc",
280 [0x1c >> 1] = "lgdt3303",
281 [0x80 >> 1] = "cs3308",
282 [0x82 >> 1] = "cs3308",
283 [0x86 >> 1] = "tda9887",
284 [0x32 >> 1] = "cx24227",
285 [0x88 >> 1] = "cx25837",
286 [0x84 >> 1] = "tda8295",
287 [0x98 >> 1] = "flatiron",
288 [0xa0 >> 1] = "eeprom",
289 [0xc0 >> 1] = "tuner/mt2131/tda8275",
290 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
291 [0xc8 >> 1] = "tuner/xc3028L",
294 static void do_i2c_scan(char *name, struct i2c_client *c)
299 for (i = 0; i < 128; i++) {
301 rc = i2c_master_recv(c, &buf, 0);
304 pr_info("%s: i2c scan: found device @ 0x%04x [%s]\n",
305 name, i, i2c_devs[i] ? i2c_devs[i] : "???");
309 /* init + register i2c adapter */
310 int cx23885_i2c_register(struct cx23885_i2c *bus)
312 struct cx23885_dev *dev = bus->dev;
314 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
316 bus->i2c_adap = cx23885_i2c_adap_template;
317 bus->i2c_client = cx23885_i2c_client_template;
318 bus->i2c_adap.dev.parent = &dev->pci->dev;
320 strlcpy(bus->i2c_adap.name, bus->dev->name,
321 sizeof(bus->i2c_adap.name));
323 bus->i2c_adap.algo_data = bus;
324 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
325 i2c_add_adapter(&bus->i2c_adap);
327 bus->i2c_client.adapter = &bus->i2c_adap;
329 if (0 == bus->i2c_rc) {
330 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
332 pr_info("%s: scan bus %d:\n",
334 do_i2c_scan(dev->name, &bus->i2c_client);
337 pr_warn("%s: i2c bus %d register FAILED\n",
340 /* Instantiate the IR receiver device, if present */
341 if (0 == bus->i2c_rc) {
342 struct i2c_board_info info;
343 const unsigned short addr_list[] = {
347 memset(&info, 0, sizeof(struct i2c_board_info));
348 strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
349 /* Use quick read command for probe, some IR chips don't
351 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
352 i2c_probe_func_quick_read);
358 int cx23885_i2c_unregister(struct cx23885_i2c *bus)
360 i2c_del_adapter(&bus->i2c_adap);
364 void cx23885_av_clk(struct cx23885_dev *dev, int enable)
366 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */
369 dprintk(1, "%s(enabled = %d)\n", __func__, enable);
380 msg.flags = I2C_M_TEN;
384 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);