diff options
author | Jiri Slaby <jslaby@suse.cz> | 2010-01-22 12:10:52 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-02-26 15:10:52 -0300 |
commit | 6c614044ff00bf3e7403ac6c4ed4e53db8c349f3 (patch) | |
tree | 52ea3e4cdeae03ae444cd155ab96cf87e94c04c4 | |
parent | 0b32d65cd7938d31eebd9c62aab6a59a3c4cf0f8 (diff) |
V4L/DVB: media: dvb/af9015, implement eeprom hashing
This will be useful for matching of IR tables later.
We read the eeprom anyway for dumping. Switch the dumping to
print_hex_dump_bytes and compute hash above that by
hash = 0;
for (u32 VAL) in (eeprom):
hash *= GOLDEN_RATIO_PRIME_32
hash += VAL; // while preserving endinaness
The computation is moved earlier to the flow, namely from
af9015_af9013_frontend_attach to af9015_read_config, so that
we can access the sum in af9015_read_config already.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r-- | drivers/media/dvb/dvb-usb/af9015.c | 65 | ||||
-rw-r--r-- | drivers/media/dvb/dvb-usb/af9015.h | 1 |
2 files changed, 44 insertions, 22 deletions
diff --git a/drivers/media/dvb/dvb-usb/af9015.c b/drivers/media/dvb/dvb-usb/af9015.c index 8b60a601fb8..9f8370f4cc8 100644 --- a/drivers/media/dvb/dvb-usb/af9015.c +++ b/drivers/media/dvb/dvb-usb/af9015.c @@ -21,6 +21,8 @@ * */ +#include <linux/hash.h> + #include "af9015.h" #include "af9013.h" #include "mt2060.h" @@ -553,26 +555,45 @@ exit: return ret; } -/* dump eeprom */ -static int af9015_eeprom_dump(struct dvb_usb_device *d) +/* hash (and dump) eeprom */ +static int af9015_eeprom_hash(struct usb_device *udev) { - u8 reg, val; + static const unsigned int eeprom_size = 256; + unsigned int reg; + int ret; + u8 val, *eeprom; + struct req_t req = {READ_I2C, AF9015_I2C_EEPROM, 0, 0, 1, 1, &val}; - for (reg = 0; ; reg++) { - if (reg % 16 == 0) { - if (reg) - deb_info(KERN_CONT "\n"); - deb_info(KERN_DEBUG "%02x:", reg); - } - if (af9015_read_reg_i2c(d, AF9015_I2C_EEPROM, reg, &val) == 0) - deb_info(KERN_CONT " %02x", val); - else - deb_info(KERN_CONT " --"); - if (reg == 0xff) - break; + eeprom = kmalloc(eeprom_size, GFP_KERNEL); + if (eeprom == NULL) + return -ENOMEM; + + for (reg = 0; reg < eeprom_size; reg++) { + req.addr = reg; + ret = af9015_rw_udev(udev, &req); + if (ret) + goto free; + eeprom[reg] = val; } - deb_info(KERN_CONT "\n"); - return 0; + + if (dvb_usb_af9015_debug & 0x01) + print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, eeprom, + eeprom_size); + + BUG_ON(eeprom_size % 4); + + af9015_config.eeprom_sum = 0; + for (reg = 0; reg < eeprom_size / sizeof(u32); reg++) { + af9015_config.eeprom_sum *= GOLDEN_RATIO_PRIME_32; + af9015_config.eeprom_sum += le32_to_cpu(((u32 *)eeprom)[reg]); + } + + deb_info("%s: eeprom sum=%.8x\n", __func__, af9015_config.eeprom_sum); + + ret = 0; +free: + kfree(eeprom); + return ret; } static int af9015_download_ir_table(struct dvb_usb_device *d) @@ -728,6 +749,11 @@ static int af9015_read_config(struct usb_device *udev) } if (ret) goto error; + + ret = af9015_eeprom_hash(udev); + if (ret) + goto error; + deb_info("%s: IR mode:%d\n", __func__, val); for (i = 0; i < af9015_properties_count; i++) { if (val == AF9015_IR_MODE_DISABLED) { @@ -1125,11 +1151,6 @@ static int af9015_af9013_frontend_attach(struct dvb_usb_adapter *adap) deb_info("%s: init I2C\n", __func__); ret = af9015_i2c_init(adap->dev); - - /* dump eeprom (debug) */ - ret = af9015_eeprom_dump(adap->dev); - if (ret) - return ret; } else { /* select I2C adapter */ i2c_adap = &state->i2c_adap; diff --git a/drivers/media/dvb/dvb-usb/af9015.h b/drivers/media/dvb/dvb-usb/af9015.h index 931c8515830..ef36b183149 100644 --- a/drivers/media/dvb/dvb-usb/af9015.h +++ b/drivers/media/dvb/dvb-usb/af9015.h @@ -107,6 +107,7 @@ struct af9015_config { u16 mt2060_if1[2]; u16 firmware_size; u16 firmware_checksum; + u32 eeprom_sum; u8 *ir_table; u16 ir_table_size; }; |