diff options
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-i2c.c')
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-i2c.c | 930 |
1 files changed, 930 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c new file mode 100644 index 0000000..c4ff973 --- /dev/null +++ b/drivers/media/usb/em28xx/em28xx-i2c.c @@ -0,0 +1,930 @@ +/* + 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; +} |