UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/drivers/media/usb/em28xx/em28xx-i2c.c

931 lines
24 KiB
C
Raw Blame History

/*
em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
Markus Rechberger <mrechberger@gmail.com>
Mauro Carvalho Chehab <mchehab@infradead.org>
Sascha Sommer <saschasommer@freenet.de>
Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include "em28xx.h"
#include "tuner-xc2028.h"
#include <media/v4l2-common.h>
#include <media/tuner.h>
/* ----------------------------------------------------------- */
static unsigned int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
/*
* em2800_i2c_send_bytes()
* send up to 4 bytes to the em2800 i2c device
*/
static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
{
int ret;
int write_timeout;
u8 b2[6];
if (len < 1 || len > 4)
return -EOPNOTSUPP;
BUG_ON(len < 1 || len > 4);
b2[5] = 0x80 + len - 1;
b2[4] = addr;
b2[3] = buf[0];
if (len > 1)
b2[2] = buf[1];
if (len > 2)
b2[1] = buf[2];
if (len > 3)
b2[0] = buf[3];
/* trigger write */
ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
if (ret != 2 + len) {
em28xx_warn("failed to trigger write to i2c address 0x%x (error=%i)\n",
addr, ret);
return (ret < 0) ? ret : -EIO;
}
/* wait for completion */
for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
write_timeout -= 5) {
ret = dev->em28xx_read_reg(dev, 0x05);
if (ret == 0x80 + len - 1) {
return len;
} else if (ret == 0x94 + len - 1) {
return -ENODEV;
} else if (ret < 0) {
em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
ret);
return ret;
}
msleep(5);
}
em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
return -EIO;
}
/*
* em2800_i2c_recv_bytes()
* read up to 4 bytes from the em2800 i2c device
*/
static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
{
u8 buf2[4];
int ret;
int read_timeout;
int i;
if (len < 1 || len > 4)
return -EOPNOTSUPP;
/* trigger read */
buf2[1] = 0x84 + len - 1;
buf2[0] = addr;
ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
if (ret != 2) {
em28xx_warn("failed to trigger read from i2c address 0x%x (error=%i)\n",
addr, ret);
return (ret < 0) ? ret : -EIO;
}
/* wait for completion */
for (read_timeout = EM2800_I2C_XFER_TIMEOUT; read_timeout > 0;
read_timeout -= 5) {
ret = dev->em28xx_read_reg(dev, 0x05);
if (ret == 0x84 + len - 1) {
break;
} else if (ret == 0x94 + len - 1) {
return -ENODEV;
} else if (ret < 0) {
em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
ret);
return ret;
}
msleep(5);
}
if (ret != 0x84 + len - 1)
em28xx_warn("read from i2c device at 0x%x timed out\n", addr);
/* get the received message */
ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4-len, buf2, len);
if (ret != len) {
em28xx_warn("reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
addr, ret);
return (ret < 0) ? ret : -EIO;
}
for (i = 0; i < len; i++)
buf[i] = buf2[len - 1 - i];
return ret;
}
/*
* em2800_i2c_check_for_device()
* check if there is an i2c device at the supplied address
*/
static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
{
u8 buf;
int ret;
ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
if (ret == 1)
return 0;
return (ret < 0) ? ret : -EIO;
}
/*
* em28xx_i2c_send_bytes()
*/
static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
u16 len, int stop)
{
int write_timeout, ret;
if (len < 1 || len > 64)
return -EOPNOTSUPP;
/*
* NOTE: limited by the USB ctrl message constraints
* Zero length reads always succeed, even if no device is connected
*/
/* Write to i2c device */
ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
if (ret != len) {
if (ret < 0) {
em28xx_warn("writing to i2c device at 0x%x failed (error=%i)\n",
addr, ret);
return ret;
} else {
em28xx_warn("%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
len, addr, ret);
return -EIO;
}
}
/* Check success of the i2c operation */
for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
write_timeout -= 5) {
ret = dev->em28xx_read_reg(dev, 0x05);
if (ret == 0) { /* success */
return len;
} else if (ret == 0x10) {
return -ENODEV;
} else if (ret < 0) {
em28xx_warn("failed to read i2c transfer status from bridge (error=%i)\n",
ret);
return ret;
}
msleep(5);
/*
* NOTE: do we really have to wait for success ?
* Never seen anything else than 0x00 or 0x10
* (even with high payload) ...
*/
}
em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
return -EIO;
}
/*
* em28xx_i2c_recv_bytes()
* read a byte from the i2c device
*/
static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
{
int ret;
if (len < 1 || len > 64)
return -EOPNOTSUPP;
/*
* NOTE: limited by the USB ctrl message constraints
* Zero length reads always succeed, even if no device is connected
*/
/* Read data from i2c device */
ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
if (ret < 0) {
em28xx_warn("reading from i2c device at 0x%x failed (error=%i)\n",
addr, ret);
return ret;
}
/*
* NOTE: some devices with two i2c busses have the bad habit to return 0
* bytes if we are on bus B AND there was no write attempt to the
* specified slave address before AND no device is present at the
* requested slave address.
* Anyway, the next check will fail with -ENODEV in this case, so avoid
* spamming the system log on device probing and do nothing here.
*/
/* Check success of the i2c operation */
ret = dev->em28xx_read_reg(dev, 0x05);
if (ret < 0) {
em28xx_warn("failed to read i2c transfer status from bridge (error=%i)\n",
ret);
return ret;
}
if (ret > 0) {
if (ret == 0x10) {
return -ENODEV;
} else {
em28xx_warn("unknown i2c error (status=%i)\n", ret);
return -EIO;
}
}
return len;
}
/*
* em28xx_i2c_check_for_device()
* check if there is a i2c_device at the supplied address
*/
static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
{
int ret;
u8 buf;
ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
if (ret == 1)
return 0;
return (ret < 0) ? ret : -EIO;
}
/*
* em25xx_bus_B_send_bytes
* write bytes to the i2c device
*/
static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
u16 len)
{
int ret;
if (len < 1 || len > 64)
return -EOPNOTSUPP;
/*
* NOTE: limited by the USB ctrl message constraints
* Zero length reads always succeed, even if no device is connected
*/
/* Set register and write value */
ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
if (ret != len) {
if (ret < 0) {
em28xx_warn("writing to i2c device at 0x%x failed (error=%i)\n",
addr, ret);
return ret;
} else {
em28xx_warn("%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
len, addr, ret);
return -EIO;
}
}
/* Check success */
ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
/*
* NOTE: the only error we've seen so far is
* 0x01 when the slave device is not present
*/
if (!ret)
return len;
else if (ret > 0)
return -ENODEV;
return ret;
/*
* NOTE: With chip types (other chip IDs) which actually don't support
* this operation, it seems to succeed ALWAYS ! (even if there is no
* slave device or even no second i2c bus provided)
*/
}
/*
* em25xx_bus_B_recv_bytes
* read bytes from the i2c device
*/
static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
u16 len)
{
int ret;
if (len < 1 || len > 64)
return -EOPNOTSUPP;
/*
* NOTE: limited by the USB ctrl message constraints
* Zero length reads always succeed, even if no device is connected
*/
/* Read value */
ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
if (ret < 0) {
em28xx_warn("reading from i2c device at 0x%x failed (error=%i)\n",
addr, ret);
return ret;
}
/*
* NOTE: some devices with two i2c busses have the bad habit to return 0
* bytes if we are on bus B AND there was no write attempt to the
* specified slave address before AND no device is present at the
* requested slave address.
* Anyway, the next check will fail with -ENODEV in this case, so avoid
* spamming the system log on device probing and do nothing here.
*/
/* Check success */
ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
/*
* NOTE: the only error we've seen so far is
* 0x01 when the slave device is not present
*/
if (!ret)
return len;
else if (ret > 0)
return -ENODEV;
return ret;
/*
* NOTE: With chip types (other chip IDs) which actually don't support
* this operation, it seems to succeed ALWAYS ! (even if there is no
* slave device or even no second i2c bus provided)
*/
}
/*
* em25xx_bus_B_check_for_device()
* check if there is a i2c device at the supplied address
*/
static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
{
u8 buf;
int ret;
ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
if (ret < 0)
return ret;
return 0;
/*
* NOTE: With chips which do not support this operation,
* it seems to succeed ALWAYS ! (even if no device connected)
*/
}
static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
{
struct em28xx *dev = i2c_bus->dev;
int rc = -EOPNOTSUPP;
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
rc = em28xx_i2c_check_for_device(dev, addr);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
rc = em2800_i2c_check_for_device(dev, addr);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
rc = em25xx_bus_B_check_for_device(dev, addr);
if (rc == -ENODEV) {
if (i2c_debug)
printk(" no device\n");
}
return rc;
}
static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
struct i2c_msg msg)
{
struct em28xx *dev = i2c_bus->dev;
u16 addr = msg.addr << 1;
int byte, rc = -EOPNOTSUPP;
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
if (i2c_debug) {
for (byte = 0; byte < msg.len; byte++)
printk(" %02x", msg.buf[byte]);
}
return rc;
}
static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
struct i2c_msg msg, int stop)
{
struct em28xx *dev = i2c_bus->dev;
u16 addr = msg.addr << 1;
int byte, rc = -EOPNOTSUPP;
if (i2c_debug) {
for (byte = 0; byte < msg.len; byte++)
printk(" %02x", msg.buf[byte]);
}
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
return rc;
}
/*
* em28xx_i2c_xfer()
* the main i2c transfer function
*/
static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg msgs[], int num)
{
struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
struct em28xx *dev = i2c_bus->dev;
unsigned bus = i2c_bus->bus;
int addr, rc, i;
u8 reg;
rc = rt_mutex_trylock(&dev->i2c_bus_lock);
if (rc < 0)
return rc;
/* Switch I2C bus if needed */
if (bus != dev->cur_i2c_bus &&
i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
if (bus == 1)
reg = EM2874_I2C_SECONDARY_BUS_SELECT;
else
reg = 0;
em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
EM2874_I2C_SECONDARY_BUS_SELECT);
dev->cur_i2c_bus = bus;
}
if (num <= 0) {
rt_mutex_unlock(&dev->i2c_bus_lock);
return 0;
}
for (i = 0; i < num; i++) {
addr = msgs[i].addr << 1;
if (i2c_debug)
printk(KERN_DEBUG "%s at %s: %s %s addr=%02x len=%d:",
dev->name, __func__ ,
(msgs[i].flags & I2C_M_RD) ? "read" : "write",
i == num - 1 ? "stop" : "nonstop",
addr, msgs[i].len);
if (!msgs[i].len) { /* no len: check only for device presence */
rc = i2c_check_for_device(i2c_bus, addr);
if (rc == -ENODEV) {
rt_mutex_unlock(&dev->i2c_bus_lock);
return rc;
}
} else if (msgs[i].flags & I2C_M_RD) {
/* read bytes */
rc = i2c_recv_bytes(i2c_bus, msgs[i]);
} else {
/* write bytes */
rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
}
if (rc < 0) {
if (i2c_debug)
printk(" ERROR: %i\n", rc);
rt_mutex_unlock(&dev->i2c_bus_lock);
return rc;
}
if (i2c_debug)
printk("\n");
}
rt_mutex_unlock(&dev->i2c_bus_lock);
return num;
}
/*
* based on linux/sunrpc/svcauth.h and linux/hash.h
* The original hash function returns a different value, if arch is x86_64
* or i386.
*/
static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
{
unsigned long hash = 0;
unsigned long l = 0;
int len = 0;
unsigned char c;
do {
if (len == length) {
c = (char)len;
len = -1;
} else
c = *buf++;
l = (l << 8) | c;
len++;
if ((len & (32 / 8 - 1)) == 0)
hash = ((hash^l) * 0x9e370001UL);
} while (len);
return (hash >> (32 - bits)) & 0xffffffffUL;
}
/*
* Helper function to read data blocks from i2c clients with 8 or 16 bit
* address width, 8 bit register width and auto incrementation been activated
*/
static int em28xx_i2c_read_block(struct em28xx *dev, unsigned bus, u16 addr,
bool addr_w16, u16 len, u8 *data)
{
int remain = len, rsize, rsize_max, ret;
u8 buf[2];
/* Sanity check */
if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
return -EINVAL;
/* Select address */
buf[0] = addr >> 8;
buf[1] = addr & 0xff;
ret = i2c_master_send(&dev->i2c_client[bus], buf + !addr_w16, 1 + addr_w16);
if (ret < 0)
return ret;
/* Read data */
if (dev->board.is_em2800)
rsize_max = 4;
else
rsize_max = 64;
while (remain > 0) {
if (remain > rsize_max)
rsize = rsize_max;
else
rsize = remain;
ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
if (ret < 0)
return ret;
remain -= rsize;
data += rsize;
}
return len;
}
static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned bus,
u8 **eedata, u16 *eedata_len)
{
const u16 len = 256;
/*
* FIXME common length/size for bytes to read, to display, hash
* calculation and returned device dataset. Simplifies the code a lot,
* but we might have to deal with multiple sizes in the future !
*/
int i, err;
struct em28xx_eeprom *dev_config;
u8 buf, *data;
*eedata = NULL;
*eedata_len = 0;
/* EEPROM is always on i2c bus 0 on all known devices. */
dev->i2c_client[bus].addr = 0xa0 >> 1;
/* Check if board has eeprom */
err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
if (err < 0) {
em28xx_info("board has no eeprom\n");
return -ENODEV;
}
data = kzalloc(len, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
/* Read EEPROM content */
err = em28xx_i2c_read_block(dev, bus, 0x0000,
dev->eeprom_addrwidth_16bit,
len, data);
if (err != len) {
em28xx_errdev("failed to read eeprom (err=%d)\n", err);
goto error;
}
/* Display eeprom content */
for (i = 0; i < len; i++) {
if (0 == (i % 16)) {
if (dev->eeprom_addrwidth_16bit)
em28xx_info("i2c eeprom %04x:", i);
else
em28xx_info("i2c eeprom %02x:", i);
}
printk(" %02x", data[i]);
if (15 == (i % 16))
printk("\n");
}
if (dev->eeprom_addrwidth_16bit)
em28xx_info("i2c eeprom %04x: ... (skipped)\n", i);
if (dev->eeprom_addrwidth_16bit &&
data[0] == 0x26 && data[3] == 0x00) {
/* new eeprom format; size 4-64kb */
u16 mc_start;
u16 hwconf_offset;
dev->hash = em28xx_hash_mem(data, len, 32);
mc_start = (data[1] << 8) + 4; /* usually 0x0004 */
em28xx_info("EEPROM ID = %02x %02x %02x %02x, EEPROM hash = 0x%08lx\n",
data[0], data[1], data[2], data[3], dev->hash);
em28xx_info("EEPROM info:\n");
em28xx_info("\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
mc_start, data[2]);
/*
* boot configuration (address 0x0002):
* [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz
* [1] always selects 12 kb RAM
* [2] USB device speed: 1 = force Full Speed; 0 = auto detect
* [4] 1 = force fast mode and no suspend for device testing
* [5:7] USB PHY tuning registers; determined by device
* characterization
*/
/*
* Read hardware config dataset offset from address
* (microcode start + 46)
*/
err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
data);
if (err != 2) {
em28xx_errdev("failed to read hardware configuration data from eeprom (err=%d)\n",
err);
goto error;
}
/* Calculate hardware config dataset start address */
hwconf_offset = mc_start + data[0] + (data[1] << 8);
/* Read hardware config dataset */
/*
* NOTE: the microcode copy can be multiple pages long, but
* we assume the hardware config dataset is the same as in
* the old eeprom and not longer than 256 bytes.
* tveeprom is currently also limited to 256 bytes.
*/
err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
data);
if (err != len) {
em28xx_errdev("failed to read hardware configuration data from eeprom (err=%d)\n",
err);
goto error;
}
/* Verify hardware config dataset */
/* NOTE: not all devices provide this type of dataset */
if (data[0] != 0x1a || data[1] != 0xeb ||
data[2] != 0x67 || data[3] != 0x95) {
em28xx_info("\tno hardware configuration dataset found in eeprom\n");
kfree(data);
return 0;
}
/* TODO: decrypt eeprom data for camera bridges (em25xx, em276x+) */
} else if (!dev->eeprom_addrwidth_16bit &&
data[0] == 0x1a && data[1] == 0xeb &&
data[2] == 0x67 && data[3] == 0x95) {
dev->hash = em28xx_hash_mem(data, len, 32);
em28xx_info("EEPROM ID = %02x %02x %02x %02x, EEPROM hash = 0x%08lx\n",
data[0], data[1], data[2], data[3], dev->hash);
em28xx_info("EEPROM info:\n");
} else {
em28xx_info("unknown eeprom format or eeprom corrupted !\n");
err = -ENODEV;
goto error;
}
*eedata = data;
*eedata_len = len;
dev_config = (void *)eedata;
switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
case 0:
em28xx_info("\tNo audio on board.\n");
break;
case 1:
em28xx_info("\tAC97 audio (5 sample rates)\n");
break;
case 2:
em28xx_info("\tI2S audio, sample rate=32k\n");
break;
case 3:
em28xx_info("\tI2S audio, 3 sample rates\n");
break;
}
if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
em28xx_info("\tUSB Remote wakeup capable\n");
if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
em28xx_info("\tUSB Self power capable\n");
switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
case 0:
em28xx_info("\t500mA max power\n");
break;
case 1:
em28xx_info("\t400mA max power\n");
break;
case 2:
em28xx_info("\t300mA max power\n");
break;
case 3:
em28xx_info("\t200mA max power\n");
break;
}
em28xx_info("\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
dev_config->string_idx_table,
le16_to_cpu(dev_config->string1),
le16_to_cpu(dev_config->string2),
le16_to_cpu(dev_config->string3));
return 0;
error:
kfree(data);
return err;
}
/* ----------------------------------------------------------- */
/*
* functionality()
*/
static u32 functionality(struct i2c_adapter *i2c_adap)
{
struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
if ((i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) ||
(i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)) {
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
} else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
}
WARN(1, "Unknown i2c bus algorithm.\n");
return 0;
}
static struct i2c_algorithm em28xx_algo = {
.master_xfer = em28xx_i2c_xfer,
.functionality = functionality,
};
static struct i2c_adapter em28xx_adap_template = {
.owner = THIS_MODULE,
.name = "em28xx",
.algo = &em28xx_algo,
};
static struct i2c_client em28xx_client_template = {
.name = "em28xx internal",
};
/* ----------------------------------------------------------- */
/*
* i2c_devs
* incomplete list of known devices
*/
static char *i2c_devs[128] = {
[0x3e >> 1] = "remote IR sensor",
[0x4a >> 1] = "saa7113h",
[0x52 >> 1] = "drxk",
[0x60 >> 1] = "remote IR sensor",
[0x8e >> 1] = "remote IR sensor",
[0x86 >> 1] = "tda9887",
[0x80 >> 1] = "msp34xx",
[0x88 >> 1] = "msp34xx",
[0xa0 >> 1] = "eeprom",
[0xb0 >> 1] = "tda9874",
[0xb8 >> 1] = "tvp5150a",
[0xba >> 1] = "webcam sensor or tvp5150a",
[0xc0 >> 1] = "tuner (analog)",
[0xc2 >> 1] = "tuner (analog)",
[0xc4 >> 1] = "tuner (analog)",
[0xc6 >> 1] = "tuner (analog)",
};
/*
* do_i2c_scan()
* check i2c address range for devices
*/
void em28xx_do_i2c_scan(struct em28xx *dev, unsigned bus)
{
u8 i2c_devicelist[128];
unsigned char buf;
int i, rc;
memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
dev->i2c_client[bus].addr = i;
rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
if (rc < 0)
continue;
i2c_devicelist[i] = i;
em28xx_info("found i2c device @ 0x%x on bus %d [%s]\n",
i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
}
if (bus == dev->def_i2c_bus)
dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
ARRAY_SIZE(i2c_devicelist), 32);
}
/*
* em28xx_i2c_register()
* register i2c bus
*/
int em28xx_i2c_register(struct em28xx *dev, unsigned bus,
enum em28xx_i2c_algo_type algo_type)
{
int retval;
BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
if (bus >= NUM_I2C_BUSES)
return -ENODEV;
dev->i2c_adap[bus] = em28xx_adap_template;
dev->i2c_adap[bus].dev.parent = &dev->udev->dev;
strcpy(dev->i2c_adap[bus].name, dev->name);
dev->i2c_bus[bus].bus = bus;
dev->i2c_bus[bus].algo_type = algo_type;
dev->i2c_bus[bus].dev = dev;
dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
i2c_set_adapdata(&dev->i2c_adap[bus], &dev->v4l2_dev);
retval = i2c_add_adapter(&dev->i2c_adap[bus]);
if (retval < 0) {
em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
__func__, retval);
return retval;
}
dev->i2c_client[bus] = em28xx_client_template;
dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
/* Up to now, all eeproms are at bus 0 */
if (!bus) {
retval = em28xx_i2c_eeprom(dev, bus, &dev->eedata, &dev->eedata_len);
if ((retval < 0) && (retval != -ENODEV)) {
em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
__func__, retval);
return retval;
}
}
if (i2c_scan)
em28xx_do_i2c_scan(dev, bus);
return 0;
}
/*
* em28xx_i2c_unregister()
* unregister i2c_bus
*/
int em28xx_i2c_unregister(struct em28xx *dev, unsigned bus)
{
if (bus >= NUM_I2C_BUSES)
return -ENODEV;
i2c_del_adapter(&dev->i2c_adap[bus]);
return 0;
}
Reference in New Issue View Git Blame Copy Permalink