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00917b5c55
linux/drivers/hwmon
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Nishanth Menon 00917b5c55 hwmon: (tmp102) Force wait for conversion time for the first valid data 
TMP102 works based on conversions done periodically. However, as per
the TMP102 data sheet[1] the first conversion is triggered immediately
after we program the configuration register. The temperature data
registers do not reflect proper data until the first conversion is
complete (in our case HZ/4).

The driver currently sets the last_update to be jiffies - HZ, just
after the configuration is complete. When TMP102 driver registers
with the thermal framework, it immediately tries to read the sensor
temperature data. This takes place even before the conversion on the
TMP102 is complete and results in an invalid temperature read.

Depending on the value read, this may cause thermal framework to
assume that a critical temperature event has occurred and attempts to
shutdown the system.

Instead of causing an invalid mid-conversion value to be read
erroneously, we mark the last_update to be in-line with the current
jiffies. This allows the tmp102_update_device function to skip update
until the required conversion time is complete. Further, we ensure to
return -EAGAIN result instead of returning spurious temperature (such
as 0C) values to the caller to prevent any wrong decisions made with
such values. NOTE: this allows the read functions not to be blocking
and allows the callers to make the decision if they would like to
block or try again later. At least the current user(thermal) seems to
handle this by retrying later.

A simpler alternative approach could be to sleep in the probe for the
duration required, but that will result in latency that is undesirable
and delay boot sequence un-necessarily.

[1] http://www.ti.com/lit/ds/symlink/tmp102.pdf

Cc: Eduardo Valentin <edubezval@gmail.com>
Reported-by: Aparna Balasubramanian <aparnab@ti.com>
Reported-by: Elvita Lobo <elvita@ti.com>
Reported-by: Yan Liu <yan-liu@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-12-10 08:14:22 -08:00
..
pmbus hwmon: (ltc2978) Add support for LTM4675 2015-08-19 09:08:55 -07:00
ab8500.c hwmon: (ab8500) Call kernel_power_off instead of pm_power_off 2014-10-03 08:19:02 -07:00
abituguru3.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
abituguru.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
abx500.c hwmon: (abx500) drop the use of IRQF_NO_SUSPEND 2015-10-14 07:57:14 -07:00
abx500.h hwmon: Add ST-Ericsson ABX500 hwmon driver 2013-04-16 18:27:52 -07:00
acpi_power_meter.c ACPI: Clean up inclusions of ACPI header files 2013-12-07 01:03:14 +01:00
ad7314.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
ad7414.c hwmon: (ad7414) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:35 -07:00
ad7418.c hwmon: (ad7418) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:35 -07:00
adc128d818.c hwmon: (adc128d818) Do proper sign extension 2015-01-25 21:24:00 -08:00
adcxx.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
adm1021.c hwmon: (adm1021) Avoid forward declaration 2014-08-04 07:01:36 -07:00
adm1025.c hwmon: (adm1025) Fix vrm write operation 2014-08-05 19:44:36 -07:00
adm1026.c hwmon: (adm1026) Fix vrm write operation 2014-08-05 19:44:36 -07:00
adm1029.c hwmon: (adm1029) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:35 -07:00
adm1031.c hwmon: (adm1031) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:37 -07:00
adm9240.c hwmon: (adm9240) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:37 -07:00
ads1015.c hwmon: (ads1015) Use of_property_read_u32 at appropriate places 2014-09-22 11:14:51 -07:00
ads7828.c hwmon: (ads7828) Check return value of devm_regmap_init_i2c 2015-02-22 20:10:30 -08:00
ads7871.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
adt7x10.c hwmon: (adt7x10) Add alarm interrupt support 2013-04-07 21:16:38 -07:00
adt7x10.h hwmon: (adt7x10) Add alarm interrupt support 2013-04-07 21:16:38 -07:00
adt7310.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
adt7410.c hwmon: (adt7x10) Add alarm interrupt support 2013-04-07 21:16:38 -07:00
adt7411.c hwmon: (adt7411) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:40 -07:00
adt7462.c hwmon: (adt7462) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:39 -07:00
adt7470.c hwmon: (adt7470) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:39 -07:00
adt7475.c Update Jean Delvare's e-mail address 2014-01-29 20:40:08 +01:00
amc6821.c hwmon: (amc6821) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:35 -07:00
applesmc.c hwmon : (applesmc) Fix uninitialized variables warnings 2015-11-15 21:52:39 -08:00
asb100.c hwmon: (asb100) Fix vrm write operation 2014-08-05 19:44:36 -07:00
asc7621.c hwmon: (asc7621) Make map tables const 2014-08-04 07:01:38 -07:00
asus_atk0110.c fs.h, drivers/hwmon/asus_atk0110.c: fix DEFINE_SIMPLE_ATTRIBUTE semicolon definition and use 2014-08-06 18:01:23 -07:00
atxp1.c hwmon: (atxp1) Drop auto-detection 2015-05-31 22:58:36 -07:00
coretemp.c hwmon: (coretemp) Increase limit of maximum core ID from 32 to 128. 2015-10-14 07:57:14 -07:00
da9052-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
da9055-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
dell-smm-hwmon.c hwmon: (dell-smm) Blacklist Dell Studio XPS 8100 2015-08-05 08:31:59 -07:00
dme1737.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
ds620.c hwmon: (ds620) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:38 -07:00
ds1621.c hwmon: (ds1621) Update zbits after conversion rate change 2014-08-28 11:18:47 -07:00
emc6w201.c hwmon: (emc6w201) Fix temperature limit range 2014-08-05 17:49:12 -07:00
emc1403.c hwmon: Make regmap configs const 2014-08-04 07:01:35 -07:00
emc2103.c hwmon: (emc2103) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:40 -07:00
f71805f.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
f71882fg.c hwmon: (f71882fg) Add support for f81768d 2015-08-09 13:44:26 -07:00
f75375s.c hwmon: (f75375s) Don't crash the kernel unnecessarily 2013-10-13 16:16:27 -07:00
fam15h_power.c hwmon: (fam15h_power) Add max compute unit accumulated power 2015-10-31 15:43:41 -07:00
fschmd.c hwmon: Fix checkpatch warning 'quoted string split across lines' 2013-04-07 21:16:40 -07:00
g760a.c hwmon: (g760a) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:37 -07:00
g762.c hwmon: (g762) Drop owner assignment from struct i2c_driver 2015-08-09 13:44:26 -07:00
gl518sm.c hwmon: (gl518sm) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:36 -07:00
gl520sm.c hwmon: (gl520sm) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:36 -07:00
gpio-fan.c hwmon: (gpio-fan) Fix module autoload for OF platform driver 2015-09-20 17:50:19 -07:00
hih6130.c hwmon: (hih6130) Fix missing hih6130->write_length setting 2014-08-05 19:40:27 -07:00
htu21.c hwmon: (htu21) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:35 -07:00
hwmon-vid.c hwmon: (hwmon-vid) Add __maybe_unused attribute to dummy variable 2013-09-10 06:28:17 -07:00
hwmon.c hwmon: Do not accept invalid name attributes 2014-03-03 08:01:06 -08:00
i5k_amb.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
i5500_temp.c hwmon: (i5500_temp) Convert to use ATTRIBUTE_GROUPS macro 2015-01-24 14:16:22 +01:00
ibmaem.c hwmon: ibmaem: Use ktime_get_ns() 2014-07-23 15:01:44 -07:00
ibmpex.c hwmon: (ibmpex) Allow format string checking 2015-03-09 09:59:35 -07:00
ibmpowernv.c hwmon: (ibmpowernv) Add OF compatibility table entry 2015-10-14 07:57:14 -07:00
iio_hwmon.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
ina2xx.c hwmon: (ina2xx) remove no longer used variable 'kind' 2015-10-31 08:46:01 -07:00
ina209.c hwmon: (ina209) Convert to use devm_hwmon_device_register_with_groups 2013-10-18 09:11:57 -07:00
it87.c hwmon: (it87) Add support for IT8732F 2015-08-09 13:44:27 -07:00
jc42.c hwmon: (jc42) Add support for additional IDT temperature sensors 2015-03-09 09:59:35 -07:00
jz4740-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
k8temp.c hwmon: remove DEFINE_PCI_DEVICE_TABLE macro 2014-01-14 21:36:30 -08:00
k10temp.c hwmon: (k10temp) Remove duplicate pci-id define 2015-11-09 10:14:29 +01:00
Kconfig hwmon: (scpi) add thermal-of dependency 2015-11-16 09:54:45 -08:00
lineage-pem.c hwmon: (lineage-pem) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:37 -07:00
lm63.c hwmon: (lm63) Fix smatch warnings 2014-08-04 07:01:36 -07:00
lm70.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
lm73.c hwmon: (lm73) Convert to use devm_hwmon_device_register_with_groups 2013-10-13 16:16:28 -07:00
lm75.c hwmon: (lm75) Add support for TMP75C 2015-10-14 07:57:14 -07:00
lm75.h hwmon: (lm75.h) Update header inclusion 2013-03-18 21:19:49 +01:00
lm77.c hwmon: (lm77) Prevent overflow problem when writing large limits 2014-07-31 09:41:46 -07:00
lm78.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
lm80.c hwmon: (lm80) Rearrange code to avoid forward declarations 2014-05-21 16:02:26 -07:00
lm83.c hwmon: (lm83) Convert to use devm_hwmon_device_register_with_groups 2014-05-21 16:02:26 -07:00
lm85.c hwmon: (lm85) use find_closest() in x_TO_REG() functions 2015-04-17 09:03:55 -04:00
lm87.c hwmon: (lm87) Fix vrm write operation 2014-08-05 19:44:42 -07:00
lm90.c hwmon: (lm90) Convert to use hwmon_device_register_with_groups 2014-04-04 18:01:35 +02:00
lm92.c hwmon: (lm92) Prevent overflow problem when writing large limits 2014-08-05 17:48:52 -07:00
lm93.c hwmon: (lm93) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:36 -07:00
lm95234.c hwmon: (lm95234) Add support for LM95233 2014-12-02 06:11:53 -08:00
lm95241.c hwmon: (lm95241) Avoid initializing the same field twice 2014-03-03 08:01:04 -08:00
lm95245.c hwmon: (lm95245) Add support for LM95235 2014-12-02 03:44:18 -08:00
ltc2945.c hwmon: Make regmap configs const 2014-08-04 07:01:35 -07:00
ltc4151.c hwmon: (ltc4151) Convert to devm_hwmon_device_register_with_groups 2014-06-12 08:36:47 -07:00
ltc4215.c hwmon: (ltc4215) Convert to devm_hwmon_device_register_with_groups 2014-03-03 08:01:05 -08:00
ltc4222.c hwmon: Make regmap configs const 2014-08-04 07:01:35 -07:00
ltc4245.c hwmon: (ltc4245) Remove devicetree conditionals 2014-03-03 08:01:05 -08:00
ltc4260.c hwmon: Make regmap configs const 2014-08-04 07:01:35 -07:00
ltc4261.c hwmon: (ltc4261) fix coccinelle warnings 2013-10-18 09:12:00 -07:00
Makefile ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
max197.c hwmon: (max197) Constify platform_device_id 2015-05-31 22:58:36 -07:00
max1111.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
max1619.c hwmon: (max1619) Convert to use devm_hwmon_device_register_with_groups 2014-05-21 16:02:25 -07:00
max1668.c hwmon: (max1668) Make max1668_addr_list array const 2014-08-04 07:01:39 -07:00
max6639.c hwmon: (max6639) Make normal_i2c array const 2014-08-04 07:01:39 -07:00
max6642.c Update Jean Delvare's e-mail address 2014-01-29 20:40:08 +01:00
max6650.c hwmon: (max6650) Introduce local 'dev' variable 2014-03-03 08:01:06 -08:00
max6697.c hwmon: (max6697) Use of_property_read_bool at appropriate places 2014-08-04 07:01:40 -07:00
max16065.c hwmon: (max16065) Use PTR_ERR_OR_ZERO 2014-08-04 07:01:38 -07:00
max31790.c hwmon: (max31790) Fix dereference of ERR_PTR 2015-10-14 07:57:14 -07:00
mc13783-adc.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
mcp3021.c hwmon: (mcp3021) Fix broken output scaling 2015-07-01 13:56:27 -07:00
menf21bmc_hwmon.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
nct6683.c hwmon: (nct6683) Add missing sysfs attribute initialization 2015-05-29 17:47:42 -07:00
nct6775.c hwmon: (nct6775) Introduce separate temperature labels for NCT6792 and NCT6793 2015-10-30 07:58:58 -07:00
nct7802.c hwmon: (nct7802) Add auto_point attributes 2015-08-09 13:44:27 -07:00
nct7904.c hwmon: (nct7904) Export I2C module alias information 2015-08-05 08:31:59 -07:00
ntc_thermistor.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
pc87360.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
pc87427.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
pcf8591.c Update Jean Delvare's e-mail address 2014-01-29 20:40:08 +01:00
powr1220.c hwmon: Add support for Lattice's POWR1220 power manager IC 2014-08-04 07:01:33 -07:00
pwm-fan.c hwmon: (pwm-fan) Fix module autoload for OF platform driver 2015-09-20 17:50:19 -07:00
s3c-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
sch56xx-common.c hwmon: Fix checkpatch warning 'quoted string split across lines' 2013-04-07 21:16:40 -07:00
sch56xx-common.h
sch5627.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
sch5636.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
scpi-hwmon.c hwmon: (scpi) skip unsupported sensors properly 2015-11-16 09:59:50 -08:00
sht15.c hwmon:change sht15_reverse() 2015-08-10 23:00:10 -07:00
sht21.c hwmon: (sht21) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:38 -07:00
shtc1.c hwmon: add support for Sensirion SHTC1 sensor 2014-06-12 08:36:48 -07:00
sis5595.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
smm665.c hwmon: (smm665) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:37 -07:00
smsc47b397.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
smsc47m1.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
smsc47m192.c hwmon: (smsc47m192) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:39 -07:00
tc74.c hwmon: add driver for Microchip TC74 2015-06-21 22:54:53 -07:00
thmc50.c hwmon: (thmc50) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:39 -07:00
tmp102.c hwmon: (tmp102) Force wait for conversion time for the first valid data 2015-12-10 08:14:22 -08:00
tmp103.c hwmon: (tmp103) Fix resource leak bug in tmp103 temperature sensor driver 2014-09-22 11:11:48 -07:00
tmp401.c hwmon: (tmp401) Do not auto-detect chip on I2C address 0x37 2015-05-29 13:37:06 -07:00
tmp421.c hwmon: (tmp421) Drop FSF mailing address 2014-08-04 07:01:38 -07:00
twl4030-madc-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
ultra45_env.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
vexpress.c hwmon: (pwm-fan, vexpress) Constify of_device_id array 2015-03-16 13:00:32 -07:00
via686a.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
via-cputemp.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
vt1211.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
vt8231.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
w83l785ts.c hwmon: Avoid initializing the same field twice 2014-04-04 18:01:34 +02:00
w83l786ng.c hwmon: (w83l786ng) Convert to devm_hwmon_device_register_with_groups 2014-08-04 07:01:34 -07:00
w83627ehf.c hwmon: (w83627ehf) Use swap() in w82627ehf_swap_tempreg() 2015-07-03 14:39:06 +02:00
w83627hf.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
w83781d.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
w83791d.c hwmon: (w83791d) Fix vrm write operation 2014-08-05 19:44:42 -07:00
w83792d.c hwmon: (w83792d) Additional PWM outputs support 2015-07-03 14:39:05 +02:00
w83793.c hwmon: (w83793) Fix vrm write operation 2014-08-05 19:44:42 -07:00
w83795.c hwmon: (w83795) use find_closest_descending() in pwm_freq_to_reg() 2015-04-17 09:03:55 -04:00
wm831x-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
wm8350-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00