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944 lines
23 KiB
944 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
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* monitoring |
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* Copyright (c) 1998, 1999 Frodo Looijaard <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/of_device.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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#include <linux/util_macros.h> |
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#include <linux/regulator/consumer.h> |
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#include "lm75.h" |
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|
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/* |
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* This driver handles the LM75 and compatible digital temperature sensors. |
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*/ |
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|
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enum lm75_type { /* keep sorted in alphabetical order */ |
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adt75, |
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ds1775, |
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ds75, |
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ds7505, |
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g751, |
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lm75, |
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lm75a, |
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lm75b, |
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max6625, |
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max6626, |
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max31725, |
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mcp980x, |
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pct2075, |
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stds75, |
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stlm75, |
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tcn75, |
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tmp100, |
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tmp101, |
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tmp105, |
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tmp112, |
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tmp175, |
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tmp275, |
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tmp75, |
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tmp75b, |
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tmp75c, |
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tmp1075, |
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}; |
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|
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/** |
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* struct lm75_params - lm75 configuration parameters. |
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* @set_mask: Bits to set in configuration register when configuring |
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* the chip. |
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* @clr_mask: Bits to clear in configuration register when configuring |
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* the chip. |
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* @default_resolution: Default number of bits to represent the temperature |
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* value. |
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* @resolution_limits: Limit register resolution. Optional. Should be set if |
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* the resolution of limit registers does not match the |
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* resolution of the temperature register. |
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* @resolutions: List of resolutions associated with sample times. |
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* Optional. Should be set if num_sample_times is larger |
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* than 1, and if the resolution changes with sample times. |
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* If set, number of entries must match num_sample_times. |
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* @default_sample_time:Sample time to be set by default. |
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* @num_sample_times: Number of possible sample times to be set. Optional. |
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* Should be set if the number of sample times is larger |
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* than one. |
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* @sample_times: All the possible sample times to be set. Mandatory if |
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* num_sample_times is larger than 1. If set, number of |
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* entries must match num_sample_times. |
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*/ |
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|
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struct lm75_params { |
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u8 set_mask; |
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u8 clr_mask; |
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u8 default_resolution; |
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u8 resolution_limits; |
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const u8 *resolutions; |
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unsigned int default_sample_time; |
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u8 num_sample_times; |
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const unsigned int *sample_times; |
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}; |
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|
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/* Addresses scanned */ |
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
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0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
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|
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/* The LM75 registers */ |
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#define LM75_REG_TEMP 0x00 |
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#define LM75_REG_CONF 0x01 |
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#define LM75_REG_HYST 0x02 |
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#define LM75_REG_MAX 0x03 |
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#define PCT2075_REG_IDLE 0x04 |
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|
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/* Each client has this additional data */ |
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struct lm75_data { |
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struct i2c_client *client; |
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struct regmap *regmap; |
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struct regulator *vs; |
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u8 orig_conf; |
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u8 current_conf; |
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u8 resolution; /* In bits, 9 to 16 */ |
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unsigned int sample_time; /* In ms */ |
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enum lm75_type kind; |
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const struct lm75_params *params; |
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}; |
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|
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/*-----------------------------------------------------------------------*/ |
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|
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static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; |
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|
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#define LM75_SAMPLE_CLEAR_MASK (3 << 5) |
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|
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/* The structure below stores the configuration values of the supported devices. |
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* In case of being supported multiple configurations, the default one must |
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* always be the first element of the array |
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*/ |
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static const struct lm75_params device_params[] = { |
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[adt75] = { |
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.clr_mask = 1 << 5, /* not one-shot mode */ |
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.default_resolution = 12, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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}, |
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[ds1775] = { |
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.clr_mask = 3 << 5, |
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.set_mask = 2 << 5, /* 11-bit mode */ |
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.default_resolution = 11, |
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.default_sample_time = 500, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 125, 250, 500, 1000 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[ds75] = { |
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.clr_mask = 3 << 5, |
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.set_mask = 2 << 5, /* 11-bit mode */ |
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.default_resolution = 11, |
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.default_sample_time = 600, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[stds75] = { |
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.clr_mask = 3 << 5, |
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.set_mask = 2 << 5, /* 11-bit mode */ |
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.default_resolution = 11, |
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.default_sample_time = 600, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 150, 300, 600, 1200 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[stlm75] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 6, |
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}, |
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[ds7505] = { |
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.set_mask = 3 << 5, /* 12-bit mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 200, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 25, 50, 100, 200 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[g751] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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}, |
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[lm75] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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}, |
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[lm75a] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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}, |
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[lm75b] = { |
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.default_resolution = 11, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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}, |
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[max6625] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 7, |
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}, |
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[max6626] = { |
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.default_resolution = 12, |
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.default_sample_time = MSEC_PER_SEC / 7, |
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.resolution_limits = 9, |
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}, |
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[max31725] = { |
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.default_resolution = 16, |
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.default_sample_time = MSEC_PER_SEC / 20, |
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}, |
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[tcn75] = { |
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.default_resolution = 9, |
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.default_sample_time = MSEC_PER_SEC / 18, |
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}, |
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[pct2075] = { |
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.default_resolution = 11, |
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.default_sample_time = MSEC_PER_SEC / 10, |
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.num_sample_times = 31, |
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.sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600, |
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700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, |
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1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, |
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2800, 2900, 3000, 3100 }, |
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}, |
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[mcp980x] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode */ |
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.default_resolution = 12, |
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.resolution_limits = 9, |
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.default_sample_time = 240, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 30, 60, 120, 240 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp100] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode */ |
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.default_resolution = 12, |
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.default_sample_time = 320, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp101] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode */ |
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.default_resolution = 12, |
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.default_sample_time = 320, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp105] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 220, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp112] = { |
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.set_mask = 3 << 5, /* 8 samples / second */ |
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.clr_mask = 1 << 7, /* no one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 125, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, |
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}, |
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[tmp175] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 220, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp275] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 220, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp75] = { |
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.set_mask = 3 << 5, /* 12-bit mode */ |
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.clr_mask = 1 << 7, /* not one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = 220, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
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.resolutions = (u8 []) {9, 10, 11, 12 }, |
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}, |
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[tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ |
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.clr_mask = 1 << 7 | 3 << 5, |
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.default_resolution = 12, |
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.default_sample_time = MSEC_PER_SEC / 37, |
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.sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
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MSEC_PER_SEC / 18, |
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MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, |
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.num_sample_times = 4, |
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}, |
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[tmp75c] = { |
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.clr_mask = 1 << 5, /*not one-shot mode*/ |
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.default_resolution = 12, |
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.default_sample_time = MSEC_PER_SEC / 12, |
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}, |
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[tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */ |
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.clr_mask = 1 << 5 | 1 << 6 | 1 << 7, |
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.default_resolution = 12, |
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.default_sample_time = 28, |
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.num_sample_times = 4, |
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.sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
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} |
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}; |
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static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
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{ |
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return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); |
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} |
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static int lm75_write_config(struct lm75_data *data, u8 set_mask, |
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u8 clr_mask) |
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{ |
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u8 value; |
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|
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clr_mask |= LM75_SHUTDOWN; |
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value = data->current_conf & ~clr_mask; |
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value |= set_mask; |
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|
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if (data->current_conf != value) { |
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s32 err; |
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err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF, |
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value); |
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if (err) |
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return err; |
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data->current_conf = value; |
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} |
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return 0; |
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} |
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|
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static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long *val) |
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{ |
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struct lm75_data *data = dev_get_drvdata(dev); |
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unsigned int regval; |
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int err, reg; |
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|
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switch (type) { |
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case hwmon_chip: |
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switch (attr) { |
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case hwmon_chip_update_interval: |
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*val = data->sample_time; |
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break; |
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default: |
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return -EINVAL; |
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} |
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break; |
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case hwmon_temp: |
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switch (attr) { |
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case hwmon_temp_input: |
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reg = LM75_REG_TEMP; |
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break; |
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case hwmon_temp_max: |
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reg = LM75_REG_MAX; |
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break; |
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case hwmon_temp_max_hyst: |
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reg = LM75_REG_HYST; |
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break; |
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default: |
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return -EINVAL; |
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} |
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err = regmap_read(data->regmap, reg, ®val); |
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if (err < 0) |
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return err; |
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|
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*val = lm75_reg_to_mc(regval, data->resolution); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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|
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static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
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{ |
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struct lm75_data *data = dev_get_drvdata(dev); |
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u8 resolution; |
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int reg; |
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|
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switch (attr) { |
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case hwmon_temp_max: |
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reg = LM75_REG_MAX; |
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break; |
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case hwmon_temp_max_hyst: |
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reg = LM75_REG_HYST; |
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break; |
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default: |
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return -EINVAL; |
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} |
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|
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/* |
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* Resolution of limit registers is assumed to be the same as the |
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* temperature input register resolution unless given explicitly. |
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*/ |
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if (data->params->resolution_limits) |
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resolution = data->params->resolution_limits; |
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else |
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resolution = data->resolution; |
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|
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temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
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temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
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1000) << (16 - resolution); |
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|
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return regmap_write(data->regmap, reg, (u16)temp); |
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} |
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|
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static int lm75_update_interval(struct device *dev, long val) |
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{ |
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struct lm75_data *data = dev_get_drvdata(dev); |
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unsigned int reg; |
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u8 index; |
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s32 err; |
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|
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index = find_closest(val, data->params->sample_times, |
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(int)data->params->num_sample_times); |
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|
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switch (data->kind) { |
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default: |
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err = lm75_write_config(data, lm75_sample_set_masks[index], |
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LM75_SAMPLE_CLEAR_MASK); |
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if (err) |
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return err; |
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|
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data->sample_time = data->params->sample_times[index]; |
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if (data->params->resolutions) |
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data->resolution = data->params->resolutions[index]; |
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break; |
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case tmp112: |
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err = regmap_read(data->regmap, LM75_REG_CONF, ®); |
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if (err < 0) |
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return err; |
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reg &= ~0x00c0; |
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reg |= (3 - index) << 6; |
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err = regmap_write(data->regmap, LM75_REG_CONF, reg); |
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if (err < 0) |
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return err; |
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data->sample_time = data->params->sample_times[index]; |
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break; |
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case pct2075: |
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err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE, |
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index + 1); |
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if (err) |
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return err; |
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data->sample_time = data->params->sample_times[index]; |
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break; |
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} |
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return 0; |
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} |
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|
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static int lm75_write_chip(struct device *dev, u32 attr, long val) |
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{ |
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switch (attr) { |
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case hwmon_chip_update_interval: |
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return lm75_update_interval(dev, val); |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
|
|
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static int lm75_write(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long val) |
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{ |
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switch (type) { |
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case hwmon_chip: |
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return lm75_write_chip(dev, attr, val); |
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case hwmon_temp: |
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return lm75_write_temp(dev, attr, val); |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
|
|
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static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
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u32 attr, int channel) |
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{ |
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const struct lm75_data *config_data = data; |
|
|
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switch (type) { |
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case hwmon_chip: |
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switch (attr) { |
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case hwmon_chip_update_interval: |
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if (config_data->params->num_sample_times > 1) |
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return 0644; |
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return 0444; |
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} |
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break; |
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case hwmon_temp: |
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switch (attr) { |
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case hwmon_temp_input: |
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return 0444; |
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case hwmon_temp_max: |
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case hwmon_temp_max_hyst: |
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return 0644; |
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} |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
|
|
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static const struct hwmon_channel_info *lm75_info[] = { |
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HWMON_CHANNEL_INFO(chip, |
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HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), |
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HWMON_CHANNEL_INFO(temp, |
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), |
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NULL |
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}; |
|
|
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static const struct hwmon_ops lm75_hwmon_ops = { |
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.is_visible = lm75_is_visible, |
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.read = lm75_read, |
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.write = lm75_write, |
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}; |
|
|
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static const struct hwmon_chip_info lm75_chip_info = { |
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.ops = &lm75_hwmon_ops, |
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.info = lm75_info, |
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}; |
|
|
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static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
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{ |
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return reg != LM75_REG_TEMP; |
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} |
|
|
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static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
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} |
|
|
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static const struct regmap_config lm75_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 16, |
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.max_register = PCT2075_REG_IDLE, |
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.writeable_reg = lm75_is_writeable_reg, |
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.volatile_reg = lm75_is_volatile_reg, |
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.val_format_endian = REGMAP_ENDIAN_BIG, |
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.cache_type = REGCACHE_RBTREE, |
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.use_single_read = true, |
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.use_single_write = true, |
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}; |
|
|
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static void lm75_disable_regulator(void *data) |
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{ |
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struct lm75_data *lm75 = data; |
|
|
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regulator_disable(lm75->vs); |
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} |
|
|
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static void lm75_remove(void *data) |
|
{ |
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struct lm75_data *lm75 = data; |
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struct i2c_client *client = lm75->client; |
|
|
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i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); |
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} |
|
|
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static const struct i2c_device_id lm75_ids[]; |
|
|
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static int lm75_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct lm75_data *data; |
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int status, err; |
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enum lm75_type kind; |
|
|
|
if (client->dev.of_node) |
|
kind = (enum lm75_type)of_device_get_match_data(&client->dev); |
|
else |
|
kind = i2c_match_id(lm75_ids, client)->driver_data; |
|
|
|
if (!i2c_check_functionality(client->adapter, |
|
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
|
return -EIO; |
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->client = client; |
|
data->kind = kind; |
|
|
|
data->vs = devm_regulator_get(dev, "vs"); |
|
if (IS_ERR(data->vs)) |
|
return PTR_ERR(data->vs); |
|
|
|
data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); |
|
if (IS_ERR(data->regmap)) |
|
return PTR_ERR(data->regmap); |
|
|
|
/* Set to LM75 resolution (9 bits, 1/2 degree C) and range. |
|
* Then tweak to be more precise when appropriate. |
|
*/ |
|
|
|
data->params = &device_params[data->kind]; |
|
|
|
/* Save default sample time and resolution*/ |
|
data->sample_time = data->params->default_sample_time; |
|
data->resolution = data->params->default_resolution; |
|
|
|
/* Enable the power */ |
|
err = regulator_enable(data->vs); |
|
if (err) { |
|
dev_err(dev, "failed to enable regulator: %d\n", err); |
|
return err; |
|
} |
|
|
|
err = devm_add_action_or_reset(dev, lm75_disable_regulator, data); |
|
if (err) |
|
return err; |
|
|
|
/* Cache original configuration */ |
|
status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
|
if (status < 0) { |
|
dev_dbg(dev, "Can't read config? %d\n", status); |
|
return status; |
|
} |
|
data->orig_conf = status; |
|
data->current_conf = status; |
|
|
|
err = lm75_write_config(data, data->params->set_mask, |
|
data->params->clr_mask); |
|
if (err) |
|
return err; |
|
|
|
err = devm_add_action_or_reset(dev, lm75_remove, data); |
|
if (err) |
|
return err; |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
|
data, &lm75_chip_info, |
|
NULL); |
|
if (IS_ERR(hwmon_dev)) |
|
return PTR_ERR(hwmon_dev); |
|
|
|
dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id lm75_ids[] = { |
|
{ "adt75", adt75, }, |
|
{ "ds1775", ds1775, }, |
|
{ "ds75", ds75, }, |
|
{ "ds7505", ds7505, }, |
|
{ "g751", g751, }, |
|
{ "lm75", lm75, }, |
|
{ "lm75a", lm75a, }, |
|
{ "lm75b", lm75b, }, |
|
{ "max6625", max6625, }, |
|
{ "max6626", max6626, }, |
|
{ "max31725", max31725, }, |
|
{ "max31726", max31725, }, |
|
{ "mcp980x", mcp980x, }, |
|
{ "pct2075", pct2075, }, |
|
{ "stds75", stds75, }, |
|
{ "stlm75", stlm75, }, |
|
{ "tcn75", tcn75, }, |
|
{ "tmp100", tmp100, }, |
|
{ "tmp101", tmp101, }, |
|
{ "tmp105", tmp105, }, |
|
{ "tmp112", tmp112, }, |
|
{ "tmp175", tmp175, }, |
|
{ "tmp275", tmp275, }, |
|
{ "tmp75", tmp75, }, |
|
{ "tmp75b", tmp75b, }, |
|
{ "tmp75c", tmp75c, }, |
|
{ "tmp1075", tmp1075, }, |
|
{ /* LIST END */ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lm75_ids); |
|
|
|
static const struct of_device_id __maybe_unused lm75_of_match[] = { |
|
{ |
|
.compatible = "adi,adt75", |
|
.data = (void *)adt75 |
|
}, |
|
{ |
|
.compatible = "dallas,ds1775", |
|
.data = (void *)ds1775 |
|
}, |
|
{ |
|
.compatible = "dallas,ds75", |
|
.data = (void *)ds75 |
|
}, |
|
{ |
|
.compatible = "dallas,ds7505", |
|
.data = (void *)ds7505 |
|
}, |
|
{ |
|
.compatible = "gmt,g751", |
|
.data = (void *)g751 |
|
}, |
|
{ |
|
.compatible = "national,lm75", |
|
.data = (void *)lm75 |
|
}, |
|
{ |
|
.compatible = "national,lm75a", |
|
.data = (void *)lm75a |
|
}, |
|
{ |
|
.compatible = "national,lm75b", |
|
.data = (void *)lm75b |
|
}, |
|
{ |
|
.compatible = "maxim,max6625", |
|
.data = (void *)max6625 |
|
}, |
|
{ |
|
.compatible = "maxim,max6626", |
|
.data = (void *)max6626 |
|
}, |
|
{ |
|
.compatible = "maxim,max31725", |
|
.data = (void *)max31725 |
|
}, |
|
{ |
|
.compatible = "maxim,max31726", |
|
.data = (void *)max31725 |
|
}, |
|
{ |
|
.compatible = "maxim,mcp980x", |
|
.data = (void *)mcp980x |
|
}, |
|
{ |
|
.compatible = "nxp,pct2075", |
|
.data = (void *)pct2075 |
|
}, |
|
{ |
|
.compatible = "st,stds75", |
|
.data = (void *)stds75 |
|
}, |
|
{ |
|
.compatible = "st,stlm75", |
|
.data = (void *)stlm75 |
|
}, |
|
{ |
|
.compatible = "microchip,tcn75", |
|
.data = (void *)tcn75 |
|
}, |
|
{ |
|
.compatible = "ti,tmp100", |
|
.data = (void *)tmp100 |
|
}, |
|
{ |
|
.compatible = "ti,tmp101", |
|
.data = (void *)tmp101 |
|
}, |
|
{ |
|
.compatible = "ti,tmp105", |
|
.data = (void *)tmp105 |
|
}, |
|
{ |
|
.compatible = "ti,tmp112", |
|
.data = (void *)tmp112 |
|
}, |
|
{ |
|
.compatible = "ti,tmp175", |
|
.data = (void *)tmp175 |
|
}, |
|
{ |
|
.compatible = "ti,tmp275", |
|
.data = (void *)tmp275 |
|
}, |
|
{ |
|
.compatible = "ti,tmp75", |
|
.data = (void *)tmp75 |
|
}, |
|
{ |
|
.compatible = "ti,tmp75b", |
|
.data = (void *)tmp75b |
|
}, |
|
{ |
|
.compatible = "ti,tmp75c", |
|
.data = (void *)tmp75c |
|
}, |
|
{ |
|
.compatible = "ti,tmp1075", |
|
.data = (void *)tmp1075 |
|
}, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, lm75_of_match); |
|
|
|
#define LM75A_ID 0xA1 |
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */ |
|
static int lm75_detect(struct i2c_client *new_client, |
|
struct i2c_board_info *info) |
|
{ |
|
struct i2c_adapter *adapter = new_client->adapter; |
|
int i; |
|
int conf, hyst, os; |
|
bool is_lm75a = 0; |
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
|
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. |
|
* |
|
* 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); |
|
if (conf & 0xe0) |
|
return -ENODEV; |
|
|
|
/* First check for LM75A */ |
|
if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { |
|
/* |
|
* LM75A returns 0xff on unused registers so |
|
* just to be sure we check for that too. |
|
*/ |
|
if (i2c_smbus_read_byte_data(new_client, 4) != 0xff |
|
|| i2c_smbus_read_byte_data(new_client, 5) != 0xff |
|
|| i2c_smbus_read_byte_data(new_client, 6) != 0xff) |
|
return -ENODEV; |
|
is_lm75a = 1; |
|
hyst = i2c_smbus_read_byte_data(new_client, 2); |
|
os = i2c_smbus_read_byte_data(new_client, 3); |
|
} else { /* Traditional style LM75 detection */ |
|
/* Unused addresses */ |
|
hyst = i2c_smbus_read_byte_data(new_client, 2); |
|
if (i2c_smbus_read_byte_data(new_client, 4) != hyst |
|
|| i2c_smbus_read_byte_data(new_client, 5) != hyst |
|
|| i2c_smbus_read_byte_data(new_client, 6) != hyst |
|
|| i2c_smbus_read_byte_data(new_client, 7) != hyst) |
|
return -ENODEV; |
|
os = i2c_smbus_read_byte_data(new_client, 3); |
|
if (i2c_smbus_read_byte_data(new_client, 4) != os |
|
|| i2c_smbus_read_byte_data(new_client, 5) != os |
|
|| i2c_smbus_read_byte_data(new_client, 6) != os |
|
|| i2c_smbus_read_byte_data(new_client, 7) != os) |
|
return -ENODEV; |
|
} |
|
/* |
|
* It is very unlikely that this is a LM75 if both |
|
* hysteresis and temperature limit registers are 0. |
|
*/ |
|
if (hyst == 0 && os == 0) |
|
return -ENODEV; |
|
|
|
/* Addresses cycling */ |
|
for (i = 8; i <= 248; i += 40) { |
|
if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
|
|| i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
|
|| i2c_smbus_read_byte_data(new_client, i + 3) != os) |
|
return -ENODEV; |
|
if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
|
!= LM75A_ID) |
|
return -ENODEV; |
|
} |
|
|
|
strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
static int lm75_suspend(struct device *dev) |
|
{ |
|
int status; |
|
struct i2c_client *client = to_i2c_client(dev); |
|
|
|
status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
|
if (status < 0) { |
|
dev_dbg(&client->dev, "Can't read config? %d\n", status); |
|
return status; |
|
} |
|
status = status | LM75_SHUTDOWN; |
|
i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
|
return 0; |
|
} |
|
|
|
static int lm75_resume(struct device *dev) |
|
{ |
|
int status; |
|
struct i2c_client *client = to_i2c_client(dev); |
|
|
|
status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
|
if (status < 0) { |
|
dev_dbg(&client->dev, "Can't read config? %d\n", status); |
|
return status; |
|
} |
|
status = status & ~LM75_SHUTDOWN; |
|
i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
|
return 0; |
|
} |
|
|
|
static const struct dev_pm_ops lm75_dev_pm_ops = { |
|
.suspend = lm75_suspend, |
|
.resume = lm75_resume, |
|
}; |
|
#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) |
|
#else |
|
#define LM75_DEV_PM_OPS NULL |
|
#endif /* CONFIG_PM */ |
|
|
|
static struct i2c_driver lm75_driver = { |
|
.class = I2C_CLASS_HWMON, |
|
.driver = { |
|
.name = "lm75", |
|
.of_match_table = of_match_ptr(lm75_of_match), |
|
.pm = LM75_DEV_PM_OPS, |
|
}, |
|
.probe_new = lm75_probe, |
|
.id_table = lm75_ids, |
|
.detect = lm75_detect, |
|
.address_list = normal_i2c, |
|
}; |
|
|
|
module_i2c_driver(lm75_driver); |
|
|
|
MODULE_AUTHOR("Frodo Looijaard <[email protected]>"); |
|
MODULE_DESCRIPTION("LM75 driver"); |
|
MODULE_LICENSE("GPL");
|
|
|