kernel/linux.git/drivers/hwmon/jc42.c, branch linux-4.16.y

hwmon: (jc42) optionally try to disable the SMBUS timeout

2017-11-30T21:12:44+00:00

With a nxp,se97 chip on an atmel sama5d31 board, the I2C adapter driver is not always capable of avoiding the 25-35 ms timeout as specified by the SMBUS protocol. This may cause silent corruption of the last bit of any transfer, e.g. a one is read instead of a zero if the sensor chip times out. This also affects the eeprom half of the nxp-se97 chip, where this silent corruption was originally noticed. Other I2C adapters probably suffer similar issues, e.g. bit-banging comes to mind as risky... The SMBUS register in the nxp chip is not a standard Jedec register, but it is not special to the nxp chips either, at least the atmel chips have the same mechanism. Therefore, do not special case this on the manufacturer, it is opt-in via the device property anyway. Cc: stable@vger.kernel.org # 4.9+ Signed-off-by: Peter Rosin Acked-by: Rob Herring Signed-off-by: Guenter Roeck

hwmon: (jc42) Add support for CAT34TS02C

2017-08-13T15:24:38+00:00

CAT34TS02C is similar to CAT34TS02 but has a different device ID. Signed-off-by: Guenter Roeck

hwmon: (jc42) Add support for GT30TS00, GT34TS02, and CAT34TS04

2017-08-13T15:24:38+00:00

Giantec GT30TS00 GT30TS00 and GT34TS02 as well as ONS CAT34TS04 are used on DDR4 DIMMs. Signed-off-by: Guenter Roeck

hwmon: (jc42) Convert to use new hwmon registration API

2016-09-09T04:34:18+00:00

Simplify code and reduce code size by using the new hwmon registration API. Signed-off-by: Guenter Roeck

hwmon: (jc42) Add support for generic JC-42.4 devicetree binding

2016-07-12T21:24:20+00:00

With this change, JC-42.4 compatible temperature sensors can be configured in devicetree by providing a generic "jedec,jc-42.4-temp" binding. Signed-off-by: Guenter Roeck

hwmon: (jc42) Add I2C_CLASS_HWMON to detection class

2016-07-04T23:27:48+00:00

In 2011, commit 774466add7c ("hwmon: (jc42) Change detection class") changed the detection class of these chips to I2C_CLASS_SPD based on this premise: "makes more sense because these chips always live on memory modules" Today these chips have applications beyond memory modules. Examples are JC42.4 compatible chips such as MCP9804 and MCP9808, but also MCP9805, which is marked as JC42.4 compliant and suggested for use not only for DIMMS, but also as generic temperature sensor. Add I2C_CLASS_HWMON as an additional detection class to allow detection by hwmon class i2c adapters. Signed-off-by: Alison Schofield Cc: Daniel Baluta [groeck: Updated description] Signed-off-by: Guenter Roeck

hwmon: (jc42) Add support for Microchip MCP9808 temperature sensor

2016-06-28T01:58:04+00:00

MCP9808 is not officially compliant to JC-42, similar to MCP9804, but its registers are compatible to JC-42. Signed-off-by: Alison Schofield Cc: Daniel Baluta Signed-off-by: Guenter Roeck

hwmon: (jc42) Add support for additional IDT temperature sensors

2015-03-09T16:59:35+00:00

TS3000GB0 has a new device ID (0x2913). Since IDT's datasheets suggest that the upper 8 bit of the device ID reflect the chip ID and the lower 8 bit reflect the version number, modify the code to accept all chips with ID 0x29xx. Also add support for TS3001 and TSE2004. Some of the datasheets for older chips are no longer available from the IDT web site, so replace explicit links in the documentation with a generic note. Reviewed-by: Jean Delvare Signed-off-by: Guenter Roeck

hwmon: (jc42) Allow negative hysteresis temperatures

2015-01-26T05:24:00+00:00

The driver supports negative high and critical limits, it can return negative hysteresis values, so there is no good reason to not let the user write negative hysteresis values. Signed-off-by: Jean Delvare Cc: Guenter Roeck Signed-off-by: Guenter Roeck

hwmon: (jc42) Fix integer overflow when writing hysteresis value

2015-01-26T05:23:59+00:00

Subtracting an unsigned long from a signed value causes an overflow with large values. Use clamp_val() to reduce the number range prior to subtracting it from the temperature limit. Signed-off-by: Guenter Roeck Reviewed-by: Jean Delvare