2 * $Id: saa7134-i2c.c,v 1.7 2004/11/07 13:17:15 kraxel Exp $
4 * device driver for philips saa7134 based TV cards
5 * i2c interface support
7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/delay.h>
31 #include "saa7134-reg.h"
34 /* ----------------------------------------------------------- */
36 static unsigned int i2c_debug = 0;
37 module_param(i2c_debug, int, 0644);
38 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
40 static unsigned int i2c_scan = 0;
41 module_param(i2c_scan, int, 0444);
42 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
44 #define d1printk if (1 == i2c_debug) printk
45 #define d2printk if (2 == i2c_debug) printk
47 #define I2C_WAIT_DELAY 32
48 #define I2C_WAIT_RETRY 16
50 /* ----------------------------------------------------------- */
52 static char *str_i2c_status[] = {
53 "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
54 "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
55 "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
59 IDLE = 0, // no I2C command pending
60 DONE_STOP = 1, // I2C command done and STOP executed
61 BUSY = 2, // executing I2C command
62 TO_SCL = 3, // executing I2C command, time out on clock stretching
63 TO_ARB = 4, // time out on arbitration trial, still trying
64 DONE_WRITE = 5, // I2C command done and awaiting next write command
65 DONE_READ = 6, // I2C command done and awaiting next read command
66 DONE_WRITE_TO = 7, // see 5, and time out on status echo
67 DONE_READ_TO = 8, // see 6, and time out on status echo
68 NO_DEVICE = 9, // no acknowledge on device slave address
69 NO_ACKN = 10, // no acknowledge after data byte transfer
70 BUS_ERR = 11, // bus error
71 ARB_LOST = 12, // arbitration lost during transfer
72 SEQ_ERR = 13, // erroneous programming sequence
73 ST_ERR = 14, // wrong status echoing
74 SW_ERR = 15 // software error
77 static char *str_i2c_attr[] = {
78 "NOP", "STOP", "CONTINUE", "START"
82 NOP = 0, // no operation on I2C bus
83 STOP = 1, // stop condition, no associated byte transfer
84 CONTINUE = 2, // continue with byte transfer
85 START = 3 // start condition with byte transfer
88 static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
90 enum i2c_status status;
92 status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
93 d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
94 str_i2c_status[status]);
98 static inline void i2c_set_status(struct saa7134_dev *dev,
99 enum i2c_status status)
101 d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
102 str_i2c_status[status]);
103 saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
106 static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
108 d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
110 saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
113 static inline int i2c_is_error(enum i2c_status status)
128 static inline int i2c_is_idle(enum i2c_status status)
139 static inline int i2c_is_busy(enum i2c_status status)
149 static int i2c_is_busy_wait(struct saa7134_dev *dev)
151 enum i2c_status status;
154 for (count = 0; count < I2C_WAIT_RETRY; count++) {
155 status = i2c_get_status(dev);
156 if (!i2c_is_busy(status))
158 saa_wait(I2C_WAIT_DELAY);
160 if (I2C_WAIT_RETRY == count)
165 static int i2c_reset(struct saa7134_dev *dev)
167 enum i2c_status status;
170 d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
171 status = i2c_get_status(dev);
172 if (!i2c_is_error(status))
174 i2c_set_status(dev,status);
176 for (count = 0; count < I2C_WAIT_RETRY; count++) {
177 status = i2c_get_status(dev);
178 if (!i2c_is_error(status))
180 udelay(I2C_WAIT_DELAY);
182 if (I2C_WAIT_RETRY == count)
185 if (!i2c_is_idle(status))
188 i2c_set_attr(dev,NOP);
192 static inline int i2c_send_byte(struct saa7134_dev *dev,
196 enum i2c_status status;
200 i2c_set_attr(dev,attr);
201 saa_writeb(SAA7134_I2C_DATA, data);
203 /* have to write both attr + data in one 32bit word */
204 dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
206 dword |= (attr << 6);
207 dword |= ((__u32)data << 8);
210 saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
212 d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);
214 if (!i2c_is_busy_wait(dev))
216 status = i2c_get_status(dev);
217 if (i2c_is_error(status))
222 static inline int i2c_recv_byte(struct saa7134_dev *dev)
224 enum i2c_status status;
227 i2c_set_attr(dev,CONTINUE);
228 if (!i2c_is_busy_wait(dev))
230 status = i2c_get_status(dev);
231 if (i2c_is_error(status))
233 data = saa_readb(SAA7134_I2C_DATA);
234 d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
238 static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
239 struct i2c_msg msgs[], int num)
241 struct saa7134_dev *dev = i2c_adap->algo_data;
242 enum i2c_status status;
246 status = i2c_get_status(dev);
247 if (!i2c_is_idle(status))
251 d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
252 for (i = 0; i < num; i++) {
253 if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
255 addr = msgs[i].addr << 1;
256 if (msgs[i].flags & I2C_M_RD)
258 d1printk(" < %02x", addr);
259 rc = i2c_send_byte(dev,START,addr);
263 if (msgs[i].flags & I2C_M_RD) {
265 for (byte = 0; byte < msgs[i].len; byte++) {
267 rc = i2c_recv_byte(dev);
270 d1printk("%02x", rc);
271 msgs[i].buf[byte] = rc;
275 for (byte = 0; byte < msgs[i].len; byte++) {
276 data = msgs[i].buf[byte];
277 d1printk(" %02x", data);
278 rc = i2c_send_byte(dev,CONTINUE,data);
285 i2c_set_attr(dev,STOP);
287 if (!i2c_is_busy_wait(dev))
289 status = i2c_get_status(dev);
290 if (i2c_is_error(status))
296 if (1 == i2c_debug) {
297 status = i2c_get_status(dev);
298 printk(" ERROR: %s\n",str_i2c_status[status]);
303 /* ----------------------------------------------------------- */
305 static int algo_control(struct i2c_adapter *adapter,
306 unsigned int cmd, unsigned long arg)
311 static u32 functionality(struct i2c_adapter *adap)
313 return I2C_FUNC_SMBUS_EMUL;
317 static void inc_use(struct i2c_adapter *adap)
322 static void dec_use(struct i2c_adapter *adap)
328 static int attach_inform(struct i2c_client *client)
330 struct saa7134_dev *dev = client->adapter->algo_data;
331 int tuner = dev->tuner_type;
332 int conf = dev->tda9887_conf;
334 saa7134_i2c_call_clients(dev,TUNER_SET_TYPE,&tuner);
335 saa7134_i2c_call_clients(dev,TDA9887_SET_CONFIG,&conf);
339 static struct i2c_algorithm saa7134_algo = {
341 .id = I2C_ALGO_SAA7134,
342 .master_xfer = saa7134_i2c_xfer,
343 .algo_control = algo_control,
344 .functionality = functionality,
347 static struct i2c_adapter saa7134_adap_template = {
349 .owner = THIS_MODULE,
354 #ifdef I2C_CLASS_TV_ANALOG
355 .class = I2C_CLASS_TV_ANALOG,
357 I2C_DEVNAME("saa7134"),
358 .id = I2C_ALGO_SAA7134,
359 .algo = &saa7134_algo,
360 .client_register = attach_inform,
363 static struct i2c_client saa7134_client_template = {
364 I2C_DEVNAME("saa7134 internal"),
368 /* ----------------------------------------------------------- */
371 saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
376 dev->i2c_client.addr = 0xa0 >> 1;
378 if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
379 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
383 if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
384 printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
388 for (i = 0; i < len; i++) {
390 printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
391 printk(" %02x",eedata[i]);
398 static char *i2c_devs[128] = {
399 [ 0x20 ] = "mpeg encoder (saa6752hs)",
400 [ 0xa0 >> 1 ] = "eeprom",
401 [ 0xc0 >> 1 ] = "tuner (analog)",
402 [ 0x86 >> 1 ] = "tda9887",
405 static void do_i2c_scan(char *name, struct i2c_client *c)
410 for (i = 0; i < 128; i++) {
412 rc = i2c_master_recv(c,&buf,0);
415 printk("%s: i2c scan: found device @ 0x%x [%s]\n",
416 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
420 void saa7134_i2c_call_clients(struct saa7134_dev *dev,
421 unsigned int cmd, void *arg)
423 BUG_ON(NULL == dev->i2c_adap.algo_data);
424 i2c_clients_command(&dev->i2c_adap, cmd, arg);
427 int saa7134_i2c_register(struct saa7134_dev *dev)
429 dev->i2c_adap = saa7134_adap_template;
430 dev->i2c_adap.dev.parent = &dev->pci->dev;
431 strcpy(dev->i2c_adap.name,dev->name);
432 dev->i2c_adap.algo_data = dev;
433 i2c_add_adapter(&dev->i2c_adap);
435 dev->i2c_client = saa7134_client_template;
436 dev->i2c_client.adapter = &dev->i2c_adap;
438 saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
440 do_i2c_scan(dev->name,&dev->i2c_client);
444 int saa7134_i2c_unregister(struct saa7134_dev *dev)
446 i2c_del_adapter(&dev->i2c_adap);
450 /* ----------------------------------------------------------- */