1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * i2c interface support
11 #include "saa7134-reg.h"
19 #include <media/v4l2-common.h>
21 /* ----------------------------------------------------------- */
25 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
29 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
33 		printk(KERN_DEBUG pr_fmt("i2c: " fmt), ## arg); \
44 /* ----------------------------------------------------------- */
53 	IDLE          = 0,  // no I2C command pending
54 	DONE_STOP     = 1,  // I2C command done and STOP executed
55 	BUSY          = 2,  // executing I2C command
56 	TO_SCL        = 3,  // executing I2C command, time out on clock stretching
58 	DONE_WRITE    = 5,  // I2C command done and awaiting next write command
59 	DONE_READ     = 6,  // I2C command done and awaiting next read command
76 	NOP           = 0,  // no operation on I2C bus
87 	i2c_dbg(2, "i2c stat <= %s\n", str_i2c_status[status]);  in i2c_get_status()
94 	i2c_dbg(2, "i2c stat => %s\n", str_i2c_status[status]);  in i2c_set_status()
100 	i2c_dbg(2, "i2c attr => %s\n", str_i2c_attr[attr]);  in i2c_set_attr()
163 	i2c_dbg(2, "i2c reset\n");  in i2c_reset()
201 	i2c_dbg(2, "i2c data => 0x%x\n", data);  in i2c_send_byte()
204 		return -EIO;  in i2c_send_byte()
207 		return -EIO;  in i2c_send_byte()
218 		return -EIO;  in i2c_recv_byte()
221 		return -EIO;  in i2c_recv_byte()
223 	i2c_dbg(2, "i2c data <= 0x%x\n", data);  in i2c_recv_byte()
230 	struct saa7134_dev *dev = i2c_adap->algo_data;  in saa7134_i2c_xfer()
238 			return -EIO;  in saa7134_i2c_xfer()
241 	i2c_dbg(1, "i2c xfer:");  in saa7134_i2c_xfer()
253 				/* workaround for a saa7134 i2c bug  in saa7134_i2c_xfer()
278 			   from Samsung S5H1411.  i2c bus gets error  in saa7134_i2c_xfer()
302 	rc = -EIO;  in saa7134_i2c_xfer()
321 /* ----------------------------------------------------------- */
343 /* ----------------------------------------------------------- */
346  * On Medion 7134 reading the SAA7134 chip config EEPROM needs DVB-T
347  * demod i2c gate closed due to an address clash between this EEPROM
364 	ret = i2c_transfer(&dev->i2c_adap, i2cgatemsg_r, 2);  in saa7134_i2c_eeprom_md7134_gate()
366 		pr_debug("%s: DVB-T demod i2c gate was left open\n",  in saa7134_i2c_eeprom_md7134_gate()
367 			 dev->name);  in saa7134_i2c_eeprom_md7134_gate()
371 		if (i2c_transfer(&dev->i2c_adap, i2cgatemsg_w, 1) != 1)  in saa7134_i2c_eeprom_md7134_gate()
372 			pr_err("%s: EEPROM i2c gate close failure\n",  in saa7134_i2c_eeprom_md7134_gate()
373 			       dev->name);  in saa7134_i2c_eeprom_md7134_gate()
383 	if (dev->board == SAA7134_BOARD_MD7134)  in saa7134_i2c_eeprom()
386 	dev->i2c_client.addr = 0xa0 >> 1;  in saa7134_i2c_eeprom()
388 	if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {  in saa7134_i2c_eeprom()
390 		       dev->name,err);  in saa7134_i2c_eeprom()
391 		return -1;  in saa7134_i2c_eeprom()
393 	if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {  in saa7134_i2c_eeprom()
394 		pr_warn("%s: i2c eeprom read error (err=%d)\n",  in saa7134_i2c_eeprom()
395 		       dev->name,err);  in saa7134_i2c_eeprom()
396 		return -1;  in saa7134_i2c_eeprom()
400 		int size = (len - i) > 16 ? 16 : len - i;  in saa7134_i2c_eeprom()
402 		pr_info("i2c eeprom %02x: %*ph\n", i, size, &eedata[i]);  in saa7134_i2c_eeprom()
422 		c->addr = i;  in do_i2c_scan()
426 		pr_info("i2c scan: found device @ 0x%x  [%s]\n",  in do_i2c_scan()
433 	dev->i2c_adap = saa7134_adap_template;  in saa7134_i2c_register()
434 	dev->i2c_adap.dev.parent = &dev->pci->dev;  in saa7134_i2c_register()
435 	strscpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));  in saa7134_i2c_register()
436 	dev->i2c_adap.algo_data = dev;  in saa7134_i2c_register()
437 	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);  in saa7134_i2c_register()
438 	i2c_add_adapter(&dev->i2c_adap);  in saa7134_i2c_register()
440 	dev->i2c_client = saa7134_client_template;  in saa7134_i2c_register()
441 	dev->i2c_client.adapter = &dev->i2c_adap;  in saa7134_i2c_register()
443 	saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));  in saa7134_i2c_register()
445 		do_i2c_scan(&dev->i2c_client);  in saa7134_i2c_register()
454 	i2c_del_adapter(&dev->i2c_adap);  in saa7134_i2c_unregister()