2 em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
6 Mauro Carvalho Chehab <mchehab@infradead.org>
7 Sascha Sommer <saschasommer@freenet.de>
8 Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/usb.h>
28 #include <linux/i2c.h>
29 #include <linux/jiffies.h>
32 #include "tuner-xc2028.h"
33 #include <media/v4l2-common.h>
34 #include <media/tuner.h>
36 /* ----------------------------------------------------------- */
38 static unsigned int i2c_scan;
39 module_param(i2c_scan, int, 0444);
40 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
42 static unsigned int i2c_debug;
43 module_param(i2c_debug, int, 0644);
44 MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
47 * em2800_i2c_send_bytes()
48 * send up to 4 bytes to the em2800 i2c device
50 static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
52 unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_I2C_XFER_TIMEOUT);
56 if (len < 1 || len > 4)
59 BUG_ON(len < 1 || len > 4);
60 b2[5] = 0x80 + len - 1;
71 ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
73 em28xx_warn("failed to trigger write to i2c address 0x%x (error=%i)\n",
75 return (ret < 0) ? ret : -EIO;
77 /* wait for completion */
78 while (time_is_after_jiffies(timeout)) {
79 ret = dev->em28xx_read_reg(dev, 0x05);
80 if (ret == 0x80 + len - 1)
82 if (ret == 0x94 + len - 1) {
84 em28xx_warn("R05 returned 0x%02x: I2C ACK error\n",
89 em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
96 em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
101 * em2800_i2c_recv_bytes()
102 * read up to 4 bytes from the em2800 i2c device
104 static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
106 unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_I2C_XFER_TIMEOUT);
111 if (len < 1 || len > 4)
115 buf2[1] = 0x84 + len - 1;
117 ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
119 em28xx_warn("failed to trigger read from i2c address 0x%x (error=%i)\n",
121 return (ret < 0) ? ret : -EIO;
124 /* wait for completion */
125 while (time_is_after_jiffies(timeout)) {
126 ret = dev->em28xx_read_reg(dev, 0x05);
127 if (ret == 0x84 + len - 1)
129 if (ret == 0x94 + len - 1) {
131 em28xx_warn("R05 returned 0x%02x: I2C ACK error\n",
136 em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
142 if (ret != 0x84 + len - 1) {
144 em28xx_warn("read from i2c device at 0x%x timed out\n",
148 /* get the received message */
149 ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4-len, buf2, len);
151 em28xx_warn("reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
153 return (ret < 0) ? ret : -EIO;
155 for (i = 0; i < len; i++)
156 buf[i] = buf2[len - 1 - i];
162 * em2800_i2c_check_for_device()
163 * check if there is an i2c device at the supplied address
165 static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
170 ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
173 return (ret < 0) ? ret : -EIO;
177 * em28xx_i2c_send_bytes()
179 static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
182 unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_I2C_XFER_TIMEOUT);
185 if (len < 1 || len > 64)
188 * NOTE: limited by the USB ctrl message constraints
189 * Zero length reads always succeed, even if no device is connected
192 /* Write to i2c device */
193 ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
196 em28xx_warn("writing to i2c device at 0x%x failed (error=%i)\n",
200 em28xx_warn("%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
206 /* wait for completion */
207 while (time_is_after_jiffies(timeout)) {
208 ret = dev->em28xx_read_reg(dev, 0x05);
209 if (ret == 0) /* success */
213 em28xx_warn("I2C ACK error on writing to addr 0x%02x\n",
218 em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
224 * NOTE: do we really have to wait for success ?
225 * Never seen anything else than 0x00 or 0x10
226 * (even with high payload) ...
230 if (ret == 0x02 || ret == 0x04) {
231 /* NOTE: these errors seem to be related to clock stretching */
233 em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
238 em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
244 * em28xx_i2c_recv_bytes()
245 * read a byte from the i2c device
247 static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
251 if (len < 1 || len > 64)
254 * NOTE: limited by the USB ctrl message constraints
255 * Zero length reads always succeed, even if no device is connected
258 /* Read data from i2c device */
259 ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
261 em28xx_warn("reading from i2c device at 0x%x failed (error=%i)\n",
266 * NOTE: some devices with two i2c busses have the bad habit to return 0
267 * bytes if we are on bus B AND there was no write attempt to the
268 * specified slave address before AND no device is present at the
269 * requested slave address.
270 * Anyway, the next check will fail with -ENXIO in this case, so avoid
271 * spamming the system log on device probing and do nothing here.
274 /* Check success of the i2c operation */
275 ret = dev->em28xx_read_reg(dev, 0x05);
276 if (ret == 0) /* success */
279 em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
285 em28xx_warn("I2C ACK error on writing to addr 0x%02x\n",
290 if (ret == 0x02 || ret == 0x04) {
291 /* NOTE: these errors seem to be related to clock stretching */
293 em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
298 em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
304 * em28xx_i2c_check_for_device()
305 * check if there is a i2c_device at the supplied address
307 static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
312 ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
315 return (ret < 0) ? ret : -EIO;
319 * em25xx_bus_B_send_bytes
320 * write bytes to the i2c device
322 static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
327 if (len < 1 || len > 64)
330 * NOTE: limited by the USB ctrl message constraints
331 * Zero length reads always succeed, even if no device is connected
334 /* Set register and write value */
335 ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
338 em28xx_warn("writing to i2c device at 0x%x failed (error=%i)\n",
342 em28xx_warn("%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
348 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
350 * NOTE: the only error we've seen so far is
351 * 0x01 when the slave device is not present
357 em28xx_warn("Bus B R08 returned 0x%02x: I2C ACK error\n",
364 * NOTE: With chip types (other chip IDs) which actually don't support
365 * this operation, it seems to succeed ALWAYS ! (even if there is no
366 * slave device or even no second i2c bus provided)
371 * em25xx_bus_B_recv_bytes
372 * read bytes from the i2c device
374 static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
379 if (len < 1 || len > 64)
382 * NOTE: limited by the USB ctrl message constraints
383 * Zero length reads always succeed, even if no device is connected
387 ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
389 em28xx_warn("reading from i2c device at 0x%x failed (error=%i)\n",
394 * NOTE: some devices with two i2c busses have the bad habit to return 0
395 * bytes if we are on bus B AND there was no write attempt to the
396 * specified slave address before AND no device is present at the
397 * requested slave address.
398 * Anyway, the next check will fail with -ENXIO in this case, so avoid
399 * spamming the system log on device probing and do nothing here.
403 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
405 * NOTE: the only error we've seen so far is
406 * 0x01 when the slave device is not present
412 em28xx_warn("Bus B R08 returned 0x%02x: I2C ACK error\n",
419 * NOTE: With chip types (other chip IDs) which actually don't support
420 * this operation, it seems to succeed ALWAYS ! (even if there is no
421 * slave device or even no second i2c bus provided)
426 * em25xx_bus_B_check_for_device()
427 * check if there is a i2c device at the supplied address
429 static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
434 ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
440 * NOTE: With chips which do not support this operation,
441 * it seems to succeed ALWAYS ! (even if no device connected)
445 static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
447 struct em28xx *dev = i2c_bus->dev;
448 int rc = -EOPNOTSUPP;
450 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
451 rc = em28xx_i2c_check_for_device(dev, addr);
452 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
453 rc = em2800_i2c_check_for_device(dev, addr);
454 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
455 rc = em25xx_bus_B_check_for_device(dev, addr);
459 static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
462 struct em28xx *dev = i2c_bus->dev;
463 u16 addr = msg.addr << 1;
464 int rc = -EOPNOTSUPP;
466 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
467 rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
468 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
469 rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
470 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
471 rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
475 static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
476 struct i2c_msg msg, int stop)
478 struct em28xx *dev = i2c_bus->dev;
479 u16 addr = msg.addr << 1;
480 int rc = -EOPNOTSUPP;
482 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
483 rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
484 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
485 rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
486 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
487 rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
493 * the main i2c transfer function
495 static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
496 struct i2c_msg msgs[], int num)
498 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
499 struct em28xx *dev = i2c_bus->dev;
500 unsigned bus = i2c_bus->bus;
504 /* prevent i2c xfer attempts after device is disconnected
505 some fe's try to do i2c writes/reads from their release
506 interfaces when called in disconnect path */
507 if (dev->disconnected)
510 if (!rt_mutex_trylock(&dev->i2c_bus_lock))
513 /* Switch I2C bus if needed */
514 if (bus != dev->cur_i2c_bus &&
515 i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
517 reg = EM2874_I2C_SECONDARY_BUS_SELECT;
520 em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
521 EM2874_I2C_SECONDARY_BUS_SELECT);
522 dev->cur_i2c_bus = bus;
526 rt_mutex_unlock(&dev->i2c_bus_lock);
529 for (i = 0; i < num; i++) {
530 addr = msgs[i].addr << 1;
532 printk(KERN_DEBUG "%s at %s: %s %s addr=%02x len=%d:",
533 dev->name, __func__ ,
534 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
535 i == num - 1 ? "stop" : "nonstop",
539 * no len: check only for device presence
540 * This code is only called during device probe.
542 rc = i2c_check_for_device(i2c_bus, addr);
546 printk(KERN_CONT " no device\n");
550 printk(KERN_CONT " ERROR: %i\n", rc);
552 rt_mutex_unlock(&dev->i2c_bus_lock);
555 } else if (msgs[i].flags & I2C_M_RD) {
557 rc = i2c_recv_bytes(i2c_bus, msgs[i]);
559 if (i2c_debug > 1 && rc >= 0)
560 printk(KERN_CONT " %*ph",
561 msgs[i].len, msgs[i].buf);
564 printk(KERN_CONT " %*ph",
565 msgs[i].len, msgs[i].buf);
568 rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
572 printk(KERN_CONT " ERROR: %i\n", rc);
573 rt_mutex_unlock(&dev->i2c_bus_lock);
577 printk(KERN_CONT "\n");
580 rt_mutex_unlock(&dev->i2c_bus_lock);
585 * based on linux/sunrpc/svcauth.h and linux/hash.h
586 * The original hash function returns a different value, if arch is x86_64
589 static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
591 unsigned long hash = 0;
604 if ((len & (32 / 8 - 1)) == 0)
605 hash = ((hash^l) * 0x9e370001UL);
608 return (hash >> (32 - bits)) & 0xffffffffUL;
612 * Helper function to read data blocks from i2c clients with 8 or 16 bit
613 * address width, 8 bit register width and auto incrementation been activated
615 static int em28xx_i2c_read_block(struct em28xx *dev, unsigned bus, u16 addr,
616 bool addr_w16, u16 len, u8 *data)
618 int remain = len, rsize, rsize_max, ret;
622 if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
626 buf[1] = addr & 0xff;
627 ret = i2c_master_send(&dev->i2c_client[bus], buf + !addr_w16, 1 + addr_w16);
631 if (dev->board.is_em2800)
636 if (remain > rsize_max)
641 ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
652 static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned bus,
653 u8 **eedata, u16 *eedata_len)
657 * FIXME common length/size for bytes to read, to display, hash
658 * calculation and returned device dataset. Simplifies the code a lot,
659 * but we might have to deal with multiple sizes in the future !
662 struct em28xx_eeprom *dev_config;
668 /* EEPROM is always on i2c bus 0 on all known devices. */
670 dev->i2c_client[bus].addr = 0xa0 >> 1;
672 /* Check if board has eeprom */
673 err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
675 em28xx_info("board has no eeprom\n");
679 data = kzalloc(len, GFP_KERNEL);
683 /* Read EEPROM content */
684 err = em28xx_i2c_read_block(dev, bus, 0x0000,
685 dev->eeprom_addrwidth_16bit,
688 em28xx_errdev("failed to read eeprom (err=%d)\n", err);
693 /* Display eeprom content */
694 print_hex_dump(KERN_INFO, "eeprom ", DUMP_PREFIX_OFFSET,
695 16, 1, data, len, true);
697 if (dev->eeprom_addrwidth_16bit)
698 em28xx_info("eeprom %06x: ... (skipped)\n", 256);
701 if (dev->eeprom_addrwidth_16bit &&
702 data[0] == 0x26 && data[3] == 0x00) {
703 /* new eeprom format; size 4-64kb */
707 dev->hash = em28xx_hash_mem(data, len, 32);
708 mc_start = (data[1] << 8) + 4; /* usually 0x0004 */
710 em28xx_info("EEPROM ID = %02x %02x %02x %02x, EEPROM hash = 0x%08lx\n",
711 data[0], data[1], data[2], data[3], dev->hash);
712 em28xx_info("EEPROM info:\n");
713 em28xx_info("\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
716 * boot configuration (address 0x0002):
717 * [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz
718 * [1] always selects 12 kb RAM
719 * [2] USB device speed: 1 = force Full Speed; 0 = auto detect
720 * [4] 1 = force fast mode and no suspend for device testing
721 * [5:7] USB PHY tuning registers; determined by device
726 * Read hardware config dataset offset from address
727 * (microcode start + 46)
729 err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
732 em28xx_errdev("failed to read hardware configuration data from eeprom (err=%d)\n",
737 /* Calculate hardware config dataset start address */
738 hwconf_offset = mc_start + data[0] + (data[1] << 8);
740 /* Read hardware config dataset */
742 * NOTE: the microcode copy can be multiple pages long, but
743 * we assume the hardware config dataset is the same as in
744 * the old eeprom and not longer than 256 bytes.
745 * tveeprom is currently also limited to 256 bytes.
747 err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
750 em28xx_errdev("failed to read hardware configuration data from eeprom (err=%d)\n",
755 /* Verify hardware config dataset */
756 /* NOTE: not all devices provide this type of dataset */
757 if (data[0] != 0x1a || data[1] != 0xeb ||
758 data[2] != 0x67 || data[3] != 0x95) {
759 em28xx_info("\tno hardware configuration dataset found in eeprom\n");
764 /* TODO: decrypt eeprom data for camera bridges (em25xx, em276x+) */
766 } else if (!dev->eeprom_addrwidth_16bit &&
767 data[0] == 0x1a && data[1] == 0xeb &&
768 data[2] == 0x67 && data[3] == 0x95) {
769 dev->hash = em28xx_hash_mem(data, len, 32);
770 em28xx_info("EEPROM ID = %02x %02x %02x %02x, EEPROM hash = 0x%08lx\n",
771 data[0], data[1], data[2], data[3], dev->hash);
772 em28xx_info("EEPROM info:\n");
774 em28xx_info("unknown eeprom format or eeprom corrupted !\n");
781 dev_config = (void *)*eedata;
783 switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
785 em28xx_info("\tNo audio on board.\n");
788 em28xx_info("\tAC97 audio (5 sample rates)\n");
791 if (dev->chip_id < CHIP_ID_EM2860)
792 em28xx_info("\tI2S audio, sample rate=32k\n");
794 em28xx_info("\tI2S audio, 3 sample rates\n");
797 if (dev->chip_id < CHIP_ID_EM2860)
798 em28xx_info("\tI2S audio, 3 sample rates\n");
800 em28xx_info("\tI2S audio, 5 sample rates\n");
804 if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
805 em28xx_info("\tUSB Remote wakeup capable\n");
807 if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
808 em28xx_info("\tUSB Self power capable\n");
810 switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
812 em28xx_info("\t500mA max power\n");
815 em28xx_info("\t400mA max power\n");
818 em28xx_info("\t300mA max power\n");
821 em28xx_info("\t200mA max power\n");
824 em28xx_info("\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
825 dev_config->string_idx_table,
826 le16_to_cpu(dev_config->string1),
827 le16_to_cpu(dev_config->string2),
828 le16_to_cpu(dev_config->string3));
837 /* ----------------------------------------------------------- */
842 static u32 functionality(struct i2c_adapter *i2c_adap)
844 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
846 if ((i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) ||
847 (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)) {
848 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
849 } else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
850 return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
851 ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
854 WARN(1, "Unknown i2c bus algorithm.\n");
858 static struct i2c_algorithm em28xx_algo = {
859 .master_xfer = em28xx_i2c_xfer,
860 .functionality = functionality,
863 static struct i2c_adapter em28xx_adap_template = {
864 .owner = THIS_MODULE,
866 .algo = &em28xx_algo,
869 static struct i2c_client em28xx_client_template = {
870 .name = "em28xx internal",
873 /* ----------------------------------------------------------- */
877 * incomplete list of known devices
879 static char *i2c_devs[128] = {
880 [0x1c >> 1] = "lgdt330x",
881 [0x3e >> 1] = "remote IR sensor",
882 [0x4a >> 1] = "saa7113h",
883 [0x52 >> 1] = "drxk",
884 [0x60 >> 1] = "remote IR sensor",
885 [0x8e >> 1] = "remote IR sensor",
886 [0x86 >> 1] = "tda9887",
887 [0x80 >> 1] = "msp34xx",
888 [0x88 >> 1] = "msp34xx",
889 [0xa0 >> 1] = "eeprom",
890 [0xb0 >> 1] = "tda9874",
891 [0xb8 >> 1] = "tvp5150a",
892 [0xba >> 1] = "webcam sensor or tvp5150a",
893 [0xc0 >> 1] = "tuner (analog)",
894 [0xc2 >> 1] = "tuner (analog)",
895 [0xc4 >> 1] = "tuner (analog)",
896 [0xc6 >> 1] = "tuner (analog)",
901 * check i2c address range for devices
903 void em28xx_do_i2c_scan(struct em28xx *dev, unsigned bus)
905 u8 i2c_devicelist[128];
909 memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
911 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
912 dev->i2c_client[bus].addr = i;
913 rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
916 i2c_devicelist[i] = i;
917 em28xx_info("found i2c device @ 0x%x on bus %d [%s]\n",
918 i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
921 if (bus == dev->def_i2c_bus)
922 dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
923 ARRAY_SIZE(i2c_devicelist), 32);
927 * em28xx_i2c_register()
930 int em28xx_i2c_register(struct em28xx *dev, unsigned bus,
931 enum em28xx_i2c_algo_type algo_type)
935 BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
936 BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
938 if (bus >= NUM_I2C_BUSES)
941 dev->i2c_adap[bus] = em28xx_adap_template;
942 dev->i2c_adap[bus].dev.parent = &dev->udev->dev;
943 strcpy(dev->i2c_adap[bus].name, dev->name);
945 dev->i2c_bus[bus].bus = bus;
946 dev->i2c_bus[bus].algo_type = algo_type;
947 dev->i2c_bus[bus].dev = dev;
948 dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
950 retval = i2c_add_adapter(&dev->i2c_adap[bus]);
952 em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
957 dev->i2c_client[bus] = em28xx_client_template;
958 dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
960 /* Up to now, all eeproms are at bus 0 */
962 retval = em28xx_i2c_eeprom(dev, bus, &dev->eedata, &dev->eedata_len);
963 if ((retval < 0) && (retval != -ENODEV)) {
964 em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
972 em28xx_do_i2c_scan(dev, bus);
978 * em28xx_i2c_unregister()
981 int em28xx_i2c_unregister(struct em28xx *dev, unsigned bus)
983 if (bus >= NUM_I2C_BUSES)
986 i2c_del_adapter(&dev->i2c_adap[bus]);