mirror of https://gitee.com/openkylin/linux.git
612 lines
15 KiB
C
612 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
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*
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* The LM95245 is a sensor chip made by TI / National Semiconductor.
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* It reports up to two temperatures (its own plus an external one).
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*
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* This driver is based on lm95241.c
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
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/* LM95245 registers */
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/* general registers */
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#define LM95245_REG_RW_CONFIG1 0x03
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#define LM95245_REG_RW_CONVERS_RATE 0x04
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#define LM95245_REG_W_ONE_SHOT 0x0F
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/* diode configuration */
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#define LM95245_REG_RW_CONFIG2 0xBF
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#define LM95245_REG_RW_REMOTE_OFFH 0x11
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#define LM95245_REG_RW_REMOTE_OFFL 0x12
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/* status registers */
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#define LM95245_REG_R_STATUS1 0x02
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#define LM95245_REG_R_STATUS2 0x33
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/* limit registers */
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#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
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#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
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#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
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#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
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/* temperature signed */
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#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
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#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
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#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
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#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
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/* temperature unsigned */
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#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
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#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
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/* id registers */
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#define LM95245_REG_R_MAN_ID 0xFE
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#define LM95245_REG_R_CHIP_ID 0xFF
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/* LM95245 specific bitfields */
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#define CFG_STOP 0x40
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#define CFG_REMOTE_TCRIT_MASK 0x10
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#define CFG_REMOTE_OS_MASK 0x08
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#define CFG_LOCAL_TCRIT_MASK 0x04
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#define CFG_LOCAL_OS_MASK 0x02
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#define CFG2_OS_A0 0x40
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#define CFG2_DIODE_FAULT_OS 0x20
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#define CFG2_DIODE_FAULT_TCRIT 0x10
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#define CFG2_REMOTE_TT 0x08
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#define CFG2_REMOTE_FILTER_DIS 0x00
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#define CFG2_REMOTE_FILTER_EN 0x06
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/* conversation rate in ms */
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#define RATE_CR0063 0x00
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#define RATE_CR0364 0x01
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#define RATE_CR1000 0x02
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#define RATE_CR2500 0x03
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#define STATUS1_ROS 0x10
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#define STATUS1_DIODE_FAULT 0x04
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#define STATUS1_RTCRIT 0x02
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#define STATUS1_LOC 0x01
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#define MANUFACTURER_ID 0x01
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#define LM95235_REVISION 0xB1
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#define LM95245_REVISION 0xB3
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/* Client data (each client gets its own) */
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struct lm95245_data {
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struct regmap *regmap;
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struct mutex update_lock;
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int interval; /* in msecs */
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};
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/* Conversions */
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static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
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{
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return val_h * 1000 + val_l * 1000 / 256;
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}
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static int temp_from_reg_signed(u8 val_h, u8 val_l)
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{
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if (val_h & 0x80)
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return (val_h - 0x100) * 1000;
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return temp_from_reg_unsigned(val_h, val_l);
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}
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static int lm95245_read_conversion_rate(struct lm95245_data *data)
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{
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unsigned int rate;
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int ret;
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ret = regmap_read(data->regmap, LM95245_REG_RW_CONVERS_RATE, &rate);
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if (ret < 0)
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return ret;
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switch (rate) {
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case RATE_CR0063:
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data->interval = 63;
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break;
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case RATE_CR0364:
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data->interval = 364;
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break;
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case RATE_CR1000:
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data->interval = 1000;
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break;
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case RATE_CR2500:
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default:
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data->interval = 2500;
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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 lm95245_set_conversion_rate(struct lm95245_data *data, long interval)
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{
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int ret, rate;
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if (interval <= 63) {
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interval = 63;
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rate = RATE_CR0063;
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} else if (interval <= 364) {
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interval = 364;
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rate = RATE_CR0364;
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} else if (interval <= 1000) {
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interval = 1000;
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rate = RATE_CR1000;
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} else {
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interval = 2500;
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rate = RATE_CR2500;
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}
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ret = regmap_write(data->regmap, LM95245_REG_RW_CONVERS_RATE, rate);
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if (ret < 0)
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return ret;
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data->interval = interval;
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return 0;
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}
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static int lm95245_read_temp(struct device *dev, u32 attr, int channel,
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long *val)
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{
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struct lm95245_data *data = dev_get_drvdata(dev);
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struct regmap *regmap = data->regmap;
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int ret, regl, regh, regvall, regvalh;
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switch (attr) {
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case hwmon_temp_input:
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regl = channel ? LM95245_REG_R_REMOTE_TEMPL_S :
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LM95245_REG_R_LOCAL_TEMPL_S;
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regh = channel ? LM95245_REG_R_REMOTE_TEMPH_S :
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LM95245_REG_R_LOCAL_TEMPH_S;
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ret = regmap_read(regmap, regl, ®vall);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, regh, ®valh);
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if (ret < 0)
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return ret;
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/*
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* Local temp is always signed.
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* Remote temp has both signed and unsigned data.
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* Use signed calculation for remote if signed bit is set
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* or if reported temperature is below signed limit.
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*/
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if (!channel || (regvalh & 0x80) || regvalh < 0x7f) {
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*val = temp_from_reg_signed(regvalh, regvall);
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return 0;
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}
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ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPL_U,
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®vall);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPH_U,
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®valh);
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if (ret < 0)
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return ret;
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*val = temp_from_reg_unsigned(regvalh, regvall);
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return 0;
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case hwmon_temp_max:
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ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
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®valh);
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if (ret < 0)
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return ret;
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*val = regvalh * 1000;
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return 0;
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case hwmon_temp_crit:
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regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
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LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
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ret = regmap_read(regmap, regh, ®valh);
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if (ret < 0)
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return ret;
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*val = regvalh * 1000;
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return 0;
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case hwmon_temp_max_hyst:
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ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
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®valh);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
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®vall);
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if (ret < 0)
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return ret;
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*val = (regvalh - regvall) * 1000;
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return 0;
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case hwmon_temp_crit_hyst:
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regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
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LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
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ret = regmap_read(regmap, regh, ®valh);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
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®vall);
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if (ret < 0)
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return ret;
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*val = (regvalh - regvall) * 1000;
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return 0;
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case hwmon_temp_type:
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ret = regmap_read(regmap, LM95245_REG_RW_CONFIG2, ®valh);
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if (ret < 0)
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return ret;
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*val = (regvalh & CFG2_REMOTE_TT) ? 1 : 2;
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return 0;
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case hwmon_temp_offset:
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ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFL,
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®vall);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFH,
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®valh);
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if (ret < 0)
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return ret;
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*val = temp_from_reg_signed(regvalh, regvall);
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return 0;
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case hwmon_temp_max_alarm:
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ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
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if (ret < 0)
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return ret;
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*val = !!(regvalh & STATUS1_ROS);
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return 0;
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case hwmon_temp_crit_alarm:
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ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
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if (ret < 0)
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return ret;
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*val = !!(regvalh & (channel ? STATUS1_RTCRIT : STATUS1_LOC));
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return 0;
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case hwmon_temp_fault:
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ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
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if (ret < 0)
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return ret;
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*val = !!(regvalh & STATUS1_DIODE_FAULT);
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm95245_write_temp(struct device *dev, u32 attr, int channel,
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long val)
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{
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struct lm95245_data *data = dev_get_drvdata(dev);
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struct regmap *regmap = data->regmap;
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unsigned int regval;
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int ret, reg;
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switch (attr) {
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case hwmon_temp_max:
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val = clamp_val(val / 1000, 0, 255);
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ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, val);
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return ret;
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case hwmon_temp_crit:
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reg = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
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LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
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val = clamp_val(val / 1000, 0, channel ? 255 : 127);
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ret = regmap_write(regmap, reg, val);
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return ret;
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case hwmon_temp_crit_hyst:
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mutex_lock(&data->update_lock);
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ret = regmap_read(regmap, LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
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®val);
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if (ret < 0) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
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/* Clamp to reasonable range to prevent overflow */
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val = clamp_val(val, -1000000, 1000000);
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val = regval - val / 1000;
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val = clamp_val(val, 0, 31);
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ret = regmap_write(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
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val);
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mutex_unlock(&data->update_lock);
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return ret;
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case hwmon_temp_offset:
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val = clamp_val(val, -128000, 127875);
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val = val * 256 / 1000;
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mutex_lock(&data->update_lock);
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ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFL,
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val & 0xe0);
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if (ret < 0) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
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ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFH,
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(val >> 8) & 0xff);
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mutex_unlock(&data->update_lock);
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return ret;
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case hwmon_temp_type:
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if (val != 1 && val != 2)
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return -EINVAL;
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ret = regmap_update_bits(regmap, LM95245_REG_RW_CONFIG2,
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CFG2_REMOTE_TT,
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val == 1 ? CFG2_REMOTE_TT : 0);
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return ret;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm95245_read_chip(struct device *dev, u32 attr, int channel,
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long *val)
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{
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struct lm95245_data *data = dev_get_drvdata(dev);
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switch (attr) {
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case hwmon_chip_update_interval:
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*val = data->interval;
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm95245_write_chip(struct device *dev, u32 attr, int channel,
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long val)
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{
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struct lm95245_data *data = dev_get_drvdata(dev);
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int ret;
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switch (attr) {
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case hwmon_chip_update_interval:
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mutex_lock(&data->update_lock);
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ret = lm95245_set_conversion_rate(data, val);
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mutex_unlock(&data->update_lock);
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return ret;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm95245_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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switch (type) {
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case hwmon_chip:
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return lm95245_read_chip(dev, attr, channel, val);
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case hwmon_temp:
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return lm95245_read_temp(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm95245_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 lm95245_write_chip(dev, attr, channel, val);
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case hwmon_temp:
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return lm95245_write_temp(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static umode_t lm95245_temp_is_visible(const void *data, u32 attr, int channel)
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{
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switch (attr) {
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case hwmon_temp_input:
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case hwmon_temp_max_alarm:
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case hwmon_temp_max_hyst:
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case hwmon_temp_crit_alarm:
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case hwmon_temp_fault:
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return 0444;
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case hwmon_temp_type:
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case hwmon_temp_max:
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case hwmon_temp_crit:
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case hwmon_temp_offset:
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return 0644;
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case hwmon_temp_crit_hyst:
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return (channel == 0) ? 0644 : 0444;
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default:
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return 0;
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}
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}
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static umode_t lm95245_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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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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return 0644;
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default:
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return 0;
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}
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case hwmon_temp:
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return lm95245_temp_is_visible(data, attr, channel);
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default:
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return 0;
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}
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}
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm95245_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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int address = new_client->addr;
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const char *name;
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int rev, id;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
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if (id != MANUFACTURER_ID)
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return -ENODEV;
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rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
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switch (rev) {
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case LM95235_REVISION:
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if (address != 0x18 && address != 0x29 && address != 0x4c)
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return -ENODEV;
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name = "lm95235";
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break;
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case LM95245_REVISION:
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name = "lm95245";
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break;
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default:
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return -ENODEV;
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}
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strlcpy(info->type, name, I2C_NAME_SIZE);
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return 0;
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}
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static int lm95245_init_client(struct lm95245_data *data)
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{
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int ret;
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ret = lm95245_read_conversion_rate(data);
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if (ret < 0)
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return ret;
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return regmap_update_bits(data->regmap, LM95245_REG_RW_CONFIG1,
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CFG_STOP, 0);
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}
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static bool lm95245_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LM95245_REG_RW_CONFIG1:
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case LM95245_REG_RW_CONVERS_RATE:
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case LM95245_REG_W_ONE_SHOT:
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case LM95245_REG_RW_CONFIG2:
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case LM95245_REG_RW_REMOTE_OFFH:
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case LM95245_REG_RW_REMOTE_OFFL:
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case LM95245_REG_RW_REMOTE_OS_LIMIT:
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case LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT:
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case LM95245_REG_RW_REMOTE_TCRIT_LIMIT:
|
|
case LM95245_REG_RW_COMMON_HYSTERESIS:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool lm95245_is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case LM95245_REG_R_STATUS1:
|
|
case LM95245_REG_R_STATUS2:
|
|
case LM95245_REG_R_LOCAL_TEMPH_S:
|
|
case LM95245_REG_R_LOCAL_TEMPL_S:
|
|
case LM95245_REG_R_REMOTE_TEMPH_S:
|
|
case LM95245_REG_R_REMOTE_TEMPL_S:
|
|
case LM95245_REG_R_REMOTE_TEMPH_U:
|
|
case LM95245_REG_R_REMOTE_TEMPL_U:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static const struct regmap_config lm95245_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.writeable_reg = lm95245_is_writeable_reg,
|
|
.volatile_reg = lm95245_is_volatile_reg,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
.use_single_read = true,
|
|
.use_single_write = true,
|
|
};
|
|
|
|
static const struct hwmon_channel_info *lm95245_info[] = {
|
|
HWMON_CHANNEL_INFO(chip,
|
|
HWMON_C_UPDATE_INTERVAL),
|
|
HWMON_CHANNEL_INFO(temp,
|
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_HYST |
|
|
HWMON_T_CRIT_ALARM,
|
|
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
|
|
HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_FAULT |
|
|
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
|
|
HWMON_T_TYPE | HWMON_T_OFFSET),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops lm95245_hwmon_ops = {
|
|
.is_visible = lm95245_is_visible,
|
|
.read = lm95245_read,
|
|
.write = lm95245_write,
|
|
};
|
|
|
|
static const struct hwmon_chip_info lm95245_chip_info = {
|
|
.ops = &lm95245_hwmon_ops,
|
|
.info = lm95245_info,
|
|
};
|
|
|
|
static int lm95245_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct lm95245_data *data;
|
|
struct device *hwmon_dev;
|
|
int ret;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->regmap = devm_regmap_init_i2c(client, &lm95245_regmap_config);
|
|
if (IS_ERR(data->regmap))
|
|
return PTR_ERR(data->regmap);
|
|
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the LM95245 chip */
|
|
ret = lm95245_init_client(data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
|
|
data,
|
|
&lm95245_chip_info,
|
|
NULL);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
/* Driver data (common to all clients) */
|
|
static const struct i2c_device_id lm95245_id[] = {
|
|
{ "lm95235", 0 },
|
|
{ "lm95245", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm95245_id);
|
|
|
|
static const struct of_device_id __maybe_unused lm95245_of_match[] = {
|
|
{ .compatible = "national,lm95235" },
|
|
{ .compatible = "national,lm95245" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, lm95245_of_match);
|
|
|
|
static struct i2c_driver lm95245_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm95245",
|
|
.of_match_table = of_match_ptr(lm95245_of_match),
|
|
},
|
|
.probe = lm95245_probe,
|
|
.id_table = lm95245_id,
|
|
.detect = lm95245_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(lm95245_driver);
|
|
|
|
MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
|
|
MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
|
|
MODULE_LICENSE("GPL");
|