1 // SPDX-License-Identifier: GPL-2.0+
3 // em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
5 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
6 // Markus Rechberger <mrechberger@gmail.com>
7 // Mauro Carvalho Chehab <mchehab@kernel.org>
8 // Sascha Sommer <saschasommer@freenet.de>
9 // Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
11 // This program is free software; you can redistribute it and/or modify
12 // it under the terms of the GNU General Public License as published by
13 // the Free Software Foundation; either version 2 of the License, or
14 // (at your option) any later version.
16 // This program is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // GNU General Public License for more details.
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/usb.h>
26 #include <linux/i2c.h>
27 #include <linux/jiffies.h>
29 #include "tuner-xc2028.h"
30 #include <media/v4l2-common.h>
31 #include <media/tuner.h>
33 /* ----------------------------------------------------------- */
35 static unsigned int i2c_scan;
36 module_param(i2c_scan, int, 0444);
37 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
39 static unsigned int i2c_debug;
40 module_param(i2c_debug, int, 0644);
41 MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
43 #define dprintk(level, fmt, arg...) do { \
44 if (i2c_debug > level) \
45 dev_printk(KERN_DEBUG, &dev->intf->dev, \
46 "i2c: %s: " fmt, __func__, ## arg); \
50 * Time in msecs to wait for i2c xfers to finish.
51 * 35ms is the maximum time a SMBUS device could wait when
52 * clock stretching is used. As the transfer itself will take
53 * some time to happen, set it to 35 ms.
55 * Ok, I2C doesn't specify any limit. So, eventually, we may need
56 * to increase this timeout.
58 #define EM28XX_I2C_XFER_TIMEOUT 35 /* ms */
60 static int em28xx_i2c_timeout(struct em28xx *dev)
62 int time = EM28XX_I2C_XFER_TIMEOUT;
64 switch (dev->i2c_speed & 0x03) {
65 case EM28XX_I2C_FREQ_25_KHZ:
66 time += 4; /* Assume 4 ms for transfers */
68 case EM28XX_I2C_FREQ_100_KHZ:
69 case EM28XX_I2C_FREQ_400_KHZ:
70 time += 1; /* Assume 1 ms for transfers */
72 default: /* EM28XX_I2C_FREQ_1_5_MHZ */
76 return msecs_to_jiffies(time);
80 * em2800_i2c_send_bytes()
81 * send up to 4 bytes to the em2800 i2c device
83 static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
85 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
89 if (len < 1 || len > 4)
92 b2[5] = 0x80 + len - 1;
103 ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
104 if (ret != 2 + len) {
105 dev_warn(&dev->intf->dev,
106 "failed to trigger write to i2c address 0x%x (error=%i)\n",
108 return (ret < 0) ? ret : -EIO;
110 /* wait for completion */
111 while (time_is_after_jiffies(timeout)) {
112 ret = dev->em28xx_read_reg(dev, 0x05);
113 if (ret == 0x80 + len - 1)
115 if (ret == 0x94 + len - 1) {
116 dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret);
120 dev_warn(&dev->intf->dev,
121 "failed to get i2c transfer status from bridge register (error=%i)\n",
125 usleep_range(5000, 6000);
127 dprintk(0, "write to i2c device at 0x%x timed out\n", addr);
132 * em2800_i2c_recv_bytes()
133 * read up to 4 bytes from the em2800 i2c device
135 static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
137 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
142 if (len < 1 || len > 4)
146 buf2[1] = 0x84 + len - 1;
148 ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
150 dev_warn(&dev->intf->dev,
151 "failed to trigger read from i2c address 0x%x (error=%i)\n",
153 return (ret < 0) ? ret : -EIO;
156 /* wait for completion */
157 while (time_is_after_jiffies(timeout)) {
158 ret = dev->em28xx_read_reg(dev, 0x05);
159 if (ret == 0x84 + len - 1)
161 if (ret == 0x94 + len - 1) {
162 dprintk(1, "R05 returned 0x%02x: I2C ACK error\n",
167 dev_warn(&dev->intf->dev,
168 "failed to get i2c transfer status from bridge register (error=%i)\n",
172 usleep_range(5000, 6000);
174 if (ret != 0x84 + len - 1)
175 dprintk(0, "read from i2c device at 0x%x timed out\n", addr);
177 /* get the received message */
178 ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4 - len, buf2, len);
180 dev_warn(&dev->intf->dev,
181 "reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
183 return (ret < 0) ? ret : -EIO;
185 for (i = 0; i < len; i++)
186 buf[i] = buf2[len - 1 - i];
192 * em2800_i2c_check_for_device()
193 * check if there is an i2c device at the supplied address
195 static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
200 ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
203 return (ret < 0) ? ret : -EIO;
207 * em28xx_i2c_send_bytes()
209 static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
212 unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
215 if (len < 1 || len > 64)
218 * NOTE: limited by the USB ctrl message constraints
219 * Zero length reads always succeed, even if no device is connected
222 /* Write to i2c device */
223 ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
226 dev_warn(&dev->intf->dev,
227 "writing to i2c device at 0x%x failed (error=%i)\n",
231 dev_warn(&dev->intf->dev,
232 "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
237 /* wait for completion */
238 while (time_is_after_jiffies(timeout)) {
239 ret = dev->em28xx_read_reg(dev, 0x05);
240 if (ret == 0) /* success */
243 dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
248 dev_warn(&dev->intf->dev,
249 "failed to get i2c transfer status from bridge register (error=%i)\n",
253 usleep_range(5000, 6000);
255 * NOTE: do we really have to wait for success ?
256 * Never seen anything else than 0x00 or 0x10
257 * (even with high payload) ...
261 if (ret == 0x02 || ret == 0x04) {
262 /* NOTE: these errors seem to be related to clock stretching */
264 "write to i2c device at 0x%x timed out (status=%i)\n",
269 dev_warn(&dev->intf->dev,
270 "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
276 * em28xx_i2c_recv_bytes()
277 * read a byte from the i2c device
279 static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
283 if (len < 1 || len > 64)
286 * NOTE: limited by the USB ctrl message constraints
287 * Zero length reads always succeed, even if no device is connected
290 /* Read data from i2c device */
291 ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
293 dev_warn(&dev->intf->dev,
294 "reading from i2c device at 0x%x failed (error=%i)\n",
299 * NOTE: some devices with two i2c busses have the bad habit to return 0
300 * bytes if we are on bus B AND there was no write attempt to the
301 * specified slave address before AND no device is present at the
302 * requested slave address.
303 * Anyway, the next check will fail with -ENXIO in this case, so avoid
304 * spamming the system log on device probing and do nothing here.
307 /* Check success of the i2c operation */
308 ret = dev->em28xx_read_reg(dev, 0x05);
309 if (ret == 0) /* success */
312 dev_warn(&dev->intf->dev,
313 "failed to get i2c transfer status from bridge register (error=%i)\n",
318 dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
323 if (ret == 0x02 || ret == 0x04) {
324 /* NOTE: these errors seem to be related to clock stretching */
326 "write to i2c device at 0x%x timed out (status=%i)\n",
331 dev_warn(&dev->intf->dev,
332 "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
338 * em28xx_i2c_check_for_device()
339 * check if there is a i2c_device at the supplied address
341 static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
346 ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
349 return (ret < 0) ? ret : -EIO;
353 * em25xx_bus_B_send_bytes
354 * write bytes to the i2c device
356 static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
361 if (len < 1 || len > 64)
364 * NOTE: limited by the USB ctrl message constraints
365 * Zero length reads always succeed, even if no device is connected
368 /* Set register and write value */
369 ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
372 dev_warn(&dev->intf->dev,
373 "writing to i2c device at 0x%x failed (error=%i)\n",
378 dev_warn(&dev->intf->dev,
379 "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
384 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
386 * NOTE: the only error we've seen so far is
387 * 0x01 when the slave device is not present
393 dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
399 * NOTE: With chip types (other chip IDs) which actually don't support
400 * this operation, it seems to succeed ALWAYS ! (even if there is no
401 * slave device or even no second i2c bus provided)
406 * em25xx_bus_B_recv_bytes
407 * read bytes from the i2c device
409 static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
414 if (len < 1 || len > 64)
417 * NOTE: limited by the USB ctrl message constraints
418 * Zero length reads always succeed, even if no device is connected
422 ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
424 dev_warn(&dev->intf->dev,
425 "reading from i2c device at 0x%x failed (error=%i)\n",
430 * NOTE: some devices with two i2c busses have the bad habit to return 0
431 * bytes if we are on bus B AND there was no write attempt to the
432 * specified slave address before AND no device is present at the
433 * requested slave address.
434 * Anyway, the next check will fail with -ENXIO in this case, so avoid
435 * spamming the system log on device probing and do nothing here.
439 ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
441 * NOTE: the only error we've seen so far is
442 * 0x01 when the slave device is not present
448 dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
454 * NOTE: With chip types (other chip IDs) which actually don't support
455 * this operation, it seems to succeed ALWAYS ! (even if there is no
456 * slave device or even no second i2c bus provided)
461 * em25xx_bus_B_check_for_device()
462 * check if there is a i2c device at the supplied address
464 static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
469 ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
475 * NOTE: With chips which do not support this operation,
476 * it seems to succeed ALWAYS ! (even if no device connected)
480 static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
482 struct em28xx *dev = i2c_bus->dev;
483 int rc = -EOPNOTSUPP;
485 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
486 rc = em28xx_i2c_check_for_device(dev, addr);
487 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
488 rc = em2800_i2c_check_for_device(dev, addr);
489 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
490 rc = em25xx_bus_B_check_for_device(dev, addr);
494 static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
497 struct em28xx *dev = i2c_bus->dev;
498 u16 addr = msg.addr << 1;
499 int rc = -EOPNOTSUPP;
501 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
502 rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
503 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
504 rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
505 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
506 rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
510 static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
511 struct i2c_msg msg, int stop)
513 struct em28xx *dev = i2c_bus->dev;
514 u16 addr = msg.addr << 1;
515 int rc = -EOPNOTSUPP;
517 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
518 rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
519 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
520 rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
521 else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
522 rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
528 * the main i2c transfer function
530 static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
531 struct i2c_msg msgs[], int num)
533 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
534 struct em28xx *dev = i2c_bus->dev;
535 unsigned int bus = i2c_bus->bus;
540 * prevent i2c xfer attempts after device is disconnected
541 * some fe's try to do i2c writes/reads from their release
542 * interfaces when called in disconnect path
544 if (dev->disconnected)
547 if (!rt_mutex_trylock(&dev->i2c_bus_lock))
550 /* Switch I2C bus if needed */
551 if (bus != dev->cur_i2c_bus &&
552 i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
554 reg = EM2874_I2C_SECONDARY_BUS_SELECT;
557 em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
558 EM2874_I2C_SECONDARY_BUS_SELECT);
559 dev->cur_i2c_bus = bus;
563 rt_mutex_unlock(&dev->i2c_bus_lock);
566 for (i = 0; i < num; i++) {
567 addr = msgs[i].addr << 1;
570 * no len: check only for device presence
571 * This code is only called during device probe.
573 rc = i2c_check_for_device(i2c_bus, addr);
577 } else if (msgs[i].flags & I2C_M_RD) {
579 rc = i2c_recv_bytes(i2c_bus, msgs[i]);
582 rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
588 dprintk(2, "%s %s addr=%02x len=%d: %*ph\n",
589 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
590 i == num - 1 ? "stop" : "nonstop",
592 msgs[i].len, msgs[i].buf);
595 rt_mutex_unlock(&dev->i2c_bus_lock);
599 dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n",
600 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
601 i == num - 1 ? "stop" : "nonstop",
603 (rc == -ENODEV) ? "no device " : "",
606 rt_mutex_unlock(&dev->i2c_bus_lock);
611 * based on linux/sunrpc/svcauth.h and linux/hash.h
612 * The original hash function returns a different value, if arch is x86_64
615 static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
617 unsigned long hash = 0;
631 if ((len & (32 / 8 - 1)) == 0)
632 hash = ((hash ^ l) * 0x9e370001UL);
635 return (hash >> (32 - bits)) & 0xffffffffUL;
639 * Helper function to read data blocks from i2c clients with 8 or 16 bit
640 * address width, 8 bit register width and auto incrementation been activated
642 static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr,
643 bool addr_w16, u16 len, u8 *data)
645 int remain = len, rsize, rsize_max, ret;
649 if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
653 buf[1] = addr & 0xff;
654 ret = i2c_master_send(&dev->i2c_client[bus],
655 buf + !addr_w16, 1 + addr_w16);
659 if (dev->board.is_em2800)
664 if (remain > rsize_max)
669 ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
680 static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus,
681 u8 **eedata, u16 *eedata_len)
685 * FIXME common length/size for bytes to read, to display, hash
686 * calculation and returned device dataset. Simplifies the code a lot,
687 * but we might have to deal with multiple sizes in the future !
690 struct em28xx_eeprom *dev_config;
696 /* EEPROM is always on i2c bus 0 on all known devices. */
698 dev->i2c_client[bus].addr = 0xa0 >> 1;
700 /* Check if board has eeprom */
701 err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
703 dev_info(&dev->intf->dev, "board has no eeprom\n");
707 data = kzalloc(len, GFP_KERNEL);
711 /* Read EEPROM content */
712 err = em28xx_i2c_read_block(dev, bus, 0x0000,
713 dev->eeprom_addrwidth_16bit,
716 dev_err(&dev->intf->dev,
717 "failed to read eeprom (err=%d)\n", err);
722 /* Display eeprom content */
723 print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET,
724 16, 1, data, len, true);
726 if (dev->eeprom_addrwidth_16bit)
727 dev_info(&dev->intf->dev,
728 "eeprom %06x: ... (skipped)\n", 256);
731 if (dev->eeprom_addrwidth_16bit &&
732 data[0] == 0x26 && data[3] == 0x00) {
733 /* new eeprom format; size 4-64kb */
737 dev->hash = em28xx_hash_mem(data, len, 32);
738 mc_start = (data[1] << 8) + 4; /* usually 0x0004 */
740 dev_info(&dev->intf->dev,
741 "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
743 dev_info(&dev->intf->dev,
745 dev_info(&dev->intf->dev,
746 "\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
749 * boot configuration (address 0x0002):
750 * [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz
751 * [1] always selects 12 kb RAM
752 * [2] USB device speed: 1 = force Full Speed; 0 = auto detect
753 * [4] 1 = force fast mode and no suspend for device testing
754 * [5:7] USB PHY tuning registers; determined by device
759 * Read hardware config dataset offset from address
760 * (microcode start + 46)
762 err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
765 dev_err(&dev->intf->dev,
766 "failed to read hardware configuration data from eeprom (err=%d)\n",
771 /* Calculate hardware config dataset start address */
772 hwconf_offset = mc_start + data[0] + (data[1] << 8);
774 /* Read hardware config dataset */
776 * NOTE: the microcode copy can be multiple pages long, but
777 * we assume the hardware config dataset is the same as in
778 * the old eeprom and not longer than 256 bytes.
779 * tveeprom is currently also limited to 256 bytes.
781 err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
784 dev_err(&dev->intf->dev,
785 "failed to read hardware configuration data from eeprom (err=%d)\n",
790 /* Verify hardware config dataset */
791 /* NOTE: not all devices provide this type of dataset */
792 if (data[0] != 0x1a || data[1] != 0xeb ||
793 data[2] != 0x67 || data[3] != 0x95) {
794 dev_info(&dev->intf->dev,
795 "\tno hardware configuration dataset found in eeprom\n");
801 * TODO: decrypt eeprom data for camera bridges
805 } else if (!dev->eeprom_addrwidth_16bit &&
806 data[0] == 0x1a && data[1] == 0xeb &&
807 data[2] == 0x67 && data[3] == 0x95) {
808 dev->hash = em28xx_hash_mem(data, len, 32);
809 dev_info(&dev->intf->dev,
810 "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
812 dev_info(&dev->intf->dev,
815 dev_info(&dev->intf->dev,
816 "unknown eeprom format or eeprom corrupted !\n");
823 dev_config = (void *)*eedata;
825 switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
827 dev_info(&dev->intf->dev, "\tNo audio on board.\n");
830 dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n");
833 if (dev->chip_id < CHIP_ID_EM2860)
834 dev_info(&dev->intf->dev,
835 "\tI2S audio, sample rate=32k\n");
837 dev_info(&dev->intf->dev,
838 "\tI2S audio, 3 sample rates\n");
841 if (dev->chip_id < CHIP_ID_EM2860)
842 dev_info(&dev->intf->dev,
843 "\tI2S audio, 3 sample rates\n");
845 dev_info(&dev->intf->dev,
846 "\tI2S audio, 5 sample rates\n");
850 if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
851 dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n");
853 if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
854 dev_info(&dev->intf->dev, "\tUSB Self power capable\n");
856 switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
858 dev_info(&dev->intf->dev, "\t500mA max power\n");
861 dev_info(&dev->intf->dev, "\t400mA max power\n");
864 dev_info(&dev->intf->dev, "\t300mA max power\n");
867 dev_info(&dev->intf->dev, "\t200mA max power\n");
870 dev_info(&dev->intf->dev,
871 "\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
872 dev_config->string_idx_table,
873 le16_to_cpu(dev_config->string1),
874 le16_to_cpu(dev_config->string2),
875 le16_to_cpu(dev_config->string3));
884 /* ----------------------------------------------------------- */
889 static u32 functionality(struct i2c_adapter *i2c_adap)
891 struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
893 if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX ||
894 i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) {
895 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
896 } else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
897 return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
898 ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
901 WARN(1, "Unknown i2c bus algorithm.\n");
905 static const struct i2c_algorithm em28xx_algo = {
906 .master_xfer = em28xx_i2c_xfer,
907 .functionality = functionality,
910 static const struct i2c_adapter em28xx_adap_template = {
911 .owner = THIS_MODULE,
913 .algo = &em28xx_algo,
916 static const struct i2c_client em28xx_client_template = {
917 .name = "em28xx internal",
920 /* ----------------------------------------------------------- */
924 * incomplete list of known devices
926 static char *i2c_devs[128] = {
927 [0x1c >> 1] = "lgdt330x",
928 [0x3e >> 1] = "remote IR sensor",
929 [0x4a >> 1] = "saa7113h",
930 [0x52 >> 1] = "drxk",
931 [0x60 >> 1] = "remote IR sensor",
932 [0x8e >> 1] = "remote IR sensor",
933 [0x86 >> 1] = "tda9887",
934 [0x80 >> 1] = "msp34xx",
935 [0x88 >> 1] = "msp34xx",
936 [0xa0 >> 1] = "eeprom",
937 [0xb0 >> 1] = "tda9874",
938 [0xb8 >> 1] = "tvp5150a",
939 [0xba >> 1] = "webcam sensor or tvp5150a",
940 [0xc0 >> 1] = "tuner (analog)",
941 [0xc2 >> 1] = "tuner (analog)",
942 [0xc4 >> 1] = "tuner (analog)",
943 [0xc6 >> 1] = "tuner (analog)",
948 * check i2c address range for devices
950 void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
952 u8 i2c_devicelist[128];
956 memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
958 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
959 dev->i2c_client[bus].addr = i;
960 rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
963 i2c_devicelist[i] = i;
964 dev_info(&dev->intf->dev,
965 "found i2c device @ 0x%x on bus %d [%s]\n",
966 i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
969 if (bus == dev->def_i2c_bus)
970 dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
971 ARRAY_SIZE(i2c_devicelist), 32);
975 * em28xx_i2c_register()
978 int em28xx_i2c_register(struct em28xx *dev, unsigned int bus,
979 enum em28xx_i2c_algo_type algo_type)
983 if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg ||
984 !dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req))
987 if (bus >= NUM_I2C_BUSES)
990 dev->i2c_adap[bus] = em28xx_adap_template;
991 dev->i2c_adap[bus].dev.parent = &dev->intf->dev;
992 strcpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev));
994 dev->i2c_bus[bus].bus = bus;
995 dev->i2c_bus[bus].algo_type = algo_type;
996 dev->i2c_bus[bus].dev = dev;
997 dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
999 retval = i2c_add_adapter(&dev->i2c_adap[bus]);
1001 dev_err(&dev->intf->dev,
1002 "%s: i2c_add_adapter failed! retval [%d]\n",
1007 dev->i2c_client[bus] = em28xx_client_template;
1008 dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
1010 /* Up to now, all eeproms are at bus 0 */
1012 retval = em28xx_i2c_eeprom(dev, bus,
1013 &dev->eedata, &dev->eedata_len);
1014 if (retval < 0 && retval != -ENODEV) {
1015 dev_err(&dev->intf->dev,
1016 "%s: em28xx_i2_eeprom failed! retval [%d]\n",
1022 em28xx_do_i2c_scan(dev, bus);
1028 * em28xx_i2c_unregister()
1029 * unregister i2c_bus
1031 int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus)
1033 if (bus >= NUM_I2C_BUSES)
1036 i2c_del_adapter(&dev->i2c_adap[bus]);