diff options
| author | David Stevenson <david@avoncliff.com> | 2012-12-18 01:37:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-15 23:43:05 -0800 |
| commit | 867ff9880d5d71a38433c0471bc09bcc10851f36 (patch) | |
| tree | bc723c92a38a39d5bdb27584ebdb069d297322f3 /drivers/w1/slaves/w1_therm.c | |
| parent | e5279ff6c9f5e950feac6e6f48621db912324c07 (diff) | |
w1_therm: Retries: remove old code add CRC
w1_therm includes some obsolete code to detect bad_roms, this is no
longer relevant.
The retry code is only used for this bad_rom test, however there is a
CRC check that detects a bad read, but does not trigger a retry. This
patch removes all the bad_rom code and uses the CRC check to trigger
retries.
Signed-off-by: David Stevenson <david@avoncliff.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/slaves/w1_therm.c')
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 25 |
1 files changed, 6 insertions, 19 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index 92d08e7fcba..5ef583d520f 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -45,10 +45,6 @@ MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature famil static int w1_strong_pullup = 1; module_param_named(strong_pullup, w1_strong_pullup, int, 0); -static u8 bad_roms[][9] = { - {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87}, - {} - }; static ssize_t w1_therm_read(struct device *device, struct device_attribute *attr, char *buf); @@ -168,16 +164,6 @@ static inline int w1_convert_temp(u8 rom[9], u8 fid) return 0; } -static int w1_therm_check_rom(u8 rom[9]) -{ - int i; - - for (i=0; i<sizeof(bad_roms)/9; ++i) - if (!memcmp(bad_roms[i], rom, 9)) - return 1; - - return 0; -} static ssize_t w1_therm_read(struct device *device, struct device_attribute *attr, char *buf) @@ -194,10 +180,11 @@ static ssize_t w1_therm_read(struct device *device, memset(rom, 0, sizeof(rom)); - verdict = 0; - crc = 0; - while (max_trying--) { + + verdict = 0; + crc = 0; + if (!w1_reset_select_slave(sl)) { int count = 0; unsigned int tm = 750; @@ -249,7 +236,7 @@ static ssize_t w1_therm_read(struct device *device, } } - if (!w1_therm_check_rom(rom)) + if (verdict) break; } @@ -260,7 +247,7 @@ static ssize_t w1_therm_read(struct device *device, if (verdict) memcpy(sl->rom, rom, sizeof(sl->rom)); else - dev_warn(device, "18S20 doesn't respond to CONVERT_TEMP.\n"); + dev_warn(device, "Read failed CRC check\n"); for (i = 0; i < 9; ++i) c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", sl->rom[i]); |