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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-26 12:52:52 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-26 12:52:52 (GMT) |
commit | 3cb603284b3d256ae9ae9e65887cee8416bfef15 (patch) | |
tree | a7012e9ca585c4ada1ff8896de326f540b460f80 /drivers/hwmon/lm75.c | |
parent | 2355e4290336fcda4b4a799448f745155a000226 (diff) | |
parent | c5794cfac09a585945e1632451900594db19393b (diff) | |
download | linux-fsl-qoriq-3cb603284b3d256ae9ae9e65887cee8416bfef15.tar.xz |
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (26 commits)
hwmon: (w83627ehf) Better fix for negative temperature values
hwmon: (w83627ehf) Uninline is_word_sized
hwmon: (lm75) Document why clones are not detected
hwmon: (w83627ehf) Move fan pins check to a separate function
hwmon: (w83627ehf) Skip reading unused voltage registers
hwmon: (lm75) Add support for Analog Devices ADT75
hwmon: (pmbus_core) Simplify sign extensions
hwmon: (pmbus) Add support for Lineage Power DC-DC converters
hwmon: (pmbus/ltc2978) Add support for LTC3880 to LTC2978 driver
hwmon: (pmbus/ltc2978) Explicit driver for LTC2978
hwmon: (pmbus) Add support for TEMP2 peak attributes
hwmon: AD7314 driver (ported from IIO)
hwmon: (pmbus) Add support for Intersil power management chips
hwmon: (pmbus) Always call _pmbus_read_byte in core driver
hwmon: (pmbus) Replace EINVAL return codes with more appropriate errors
hwmon: (pmbus) Provide more documentation
hwmon/f71882fg: Make the decision wether to register fan attr. per fan
hwmon/f71882fg: Add a f71882fg_create_fan_sysfs_files helper function
hwmon/f71882fg: Make all fan/pwm attr tables 2 dimensional
hwmon: (exynos4_tmu) Remove IRQF_DISABLED
...
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r-- | drivers/hwmon/lm75.c | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index ef902d5..90126a2 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -35,6 +35,7 @@ */ enum lm75_type { /* keep sorted in alphabetical order */ + adt75, ds1775, ds75, lm75, @@ -213,6 +214,7 @@ static int lm75_remove(struct i2c_client *client) } static const struct i2c_device_id lm75_ids[] = { + { "adt75", adt75, }, { "ds1775", ds1775, }, { "ds75", ds75, }, { "lm75", lm75, }, @@ -247,19 +249,30 @@ static int lm75_detect(struct i2c_client *new_client, I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; - /* Now, we do the remaining detection. There is no identification- - dedicated register so we have to rely on several tricks: - unused bits, registers cycling over 8-address boundaries, - addresses 0x04-0x07 returning the last read value. - The cycling+unused addresses combination is not tested, - since it would significantly slow the detection down and would - hardly add any value. - - The National Semiconductor LM75A is different than earlier - LM75s. It has an ID byte of 0xaX (where X is the chip - revision, with 1 being the only revision in existence) in - register 7, and unused registers return 0xff rather than the - last read value. */ + /* + * Now, we do the remaining detection. There is no identification- + * dedicated register so we have to rely on several tricks: + * unused bits, registers cycling over 8-address boundaries, + * addresses 0x04-0x07 returning the last read value. + * The cycling+unused addresses combination is not tested, + * since it would significantly slow the detection down and would + * hardly add any value. + * + * The National Semiconductor LM75A is different than earlier + * LM75s. It has an ID byte of 0xaX (where X is the chip + * revision, with 1 being the only revision in existence) in + * register 7, and unused registers return 0xff rather than the + * last read value. + * + * Note that this function only detects the original National + * Semiconductor LM75 and the LM75A. Clones from other vendors + * aren't detected, on purpose, because they are typically never + * found on PC hardware. They are found on embedded designs where + * they can be instantiated explicitly so detection is not needed. + * The absence of identification registers on all these clones + * would make their exhaustive detection very difficult and weak, + * and odds are that the driver would bind to unsupported devices. + */ /* Unused bits */ conf = i2c_smbus_read_byte_data(new_client, 1); |