945 lines
23 KiB
C
945 lines
23 KiB
C
// 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 <frodol@dds.nl>
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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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* This driver handles the LM75 and compatible digital temperature sensors.
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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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* 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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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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/* 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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/* 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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/* 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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static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 };
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#define LM75_SAMPLE_CLEAR_MASK (3 << 5)
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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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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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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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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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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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*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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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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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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* 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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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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return regmap_write(data->regmap, reg, (u16)temp);
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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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index = find_closest(val, data->params->sample_times,
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(int)data->params->num_sample_times);
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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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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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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,
|
|
HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
|
|
HWMON_CHANNEL_INFO(temp,
|
|
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops lm75_hwmon_ops = {
|
|
.is_visible = lm75_is_visible,
|
|
.read = lm75_read,
|
|
.write = lm75_write,
|
|
};
|
|
|
|
static const struct hwmon_chip_info lm75_chip_info = {
|
|
.ops = &lm75_hwmon_ops,
|
|
.info = lm75_info,
|
|
};
|
|
|
|
static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return reg != LM75_REG_TEMP;
|
|
}
|
|
|
|
static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
|
|
}
|
|
|
|
static const struct regmap_config lm75_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 16,
|
|
.max_register = PCT2075_REG_IDLE,
|
|
.writeable_reg = lm75_is_writeable_reg,
|
|
.volatile_reg = lm75_is_volatile_reg,
|
|
.val_format_endian = REGMAP_ENDIAN_BIG,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
.use_single_read = true,
|
|
.use_single_write = true,
|
|
};
|
|
|
|
static void lm75_disable_regulator(void *data)
|
|
{
|
|
struct lm75_data *lm75 = data;
|
|
|
|
regulator_disable(lm75->vs);
|
|
}
|
|
|
|
static void lm75_remove(void *data)
|
|
{
|
|
struct lm75_data *lm75 = data;
|
|
struct i2c_client *client = lm75->client;
|
|
|
|
i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf);
|
|
}
|
|
|
|
static const struct i2c_device_id lm75_ids[];
|
|
|
|
static int lm75_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct device *hwmon_dev;
|
|
struct lm75_data *data;
|
|
int status, err;
|
|
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 <frodol@dds.nl>");
|
|
MODULE_DESCRIPTION("LM75 driver");
|
|
MODULE_LICENSE("GPL");
|