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90368fa397
Bail out immediately if reading any of the registers used for chip detection fails, or if it returns an unexpected value. Drop all log messages from detection code. Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
400 lines
9.3 KiB
C
400 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
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* Jean Delvare <jdelvare@suse.de>
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*
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* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
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* It reports up to two temperatures (its own plus up to
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* one external one). Complete datasheet can be
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* obtained from Maxim's website at:
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* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/util_macros.h>
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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#define MAX1619_REG_LOCAL_TEMP 0x00
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#define MAX1619_REG_REMOTE_TEMP 0x01
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#define MAX1619_REG_STATUS 0x02
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#define MAX1619_REG_CONFIG 0x03
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#define MAX1619_REG_CONVRATE 0x04
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#define MAX1619_REG_REMOTE_HIGH 0x07
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#define MAX1619_REG_REMOTE_LOW 0x08
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#define MAX1619_REG_REMOTE_CRIT 0x10
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#define MAX1619_REG_REMOTE_CRIT_HYST 0x11
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#define MAX1619_REG_MAN_ID 0xFE
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#define MAX1619_REG_CHIP_ID 0xFF
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static int get_alarms(struct regmap *regmap)
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{
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static u32 regs[2] = { MAX1619_REG_STATUS, MAX1619_REG_CONFIG };
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u8 regdata[2];
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int ret;
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ret = regmap_multi_reg_read(regmap, regs, regdata, 2);
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if (ret)
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return ret;
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/* OVERT status bit may be reversed */
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if (!(regdata[1] & 0x20))
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regdata[0] ^= 0x02;
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return regdata[0] & 0x1e;
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}
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static int max1619_temp_read(struct regmap *regmap, u32 attr, int channel, long *val)
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{
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int reg = -1, alarm_bit = 0;
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u32 temp;
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int ret;
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switch (attr) {
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case hwmon_temp_input:
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reg = channel ? MAX1619_REG_REMOTE_TEMP : MAX1619_REG_LOCAL_TEMP;
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break;
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case hwmon_temp_min:
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reg = MAX1619_REG_REMOTE_LOW;
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break;
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case hwmon_temp_max:
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reg = MAX1619_REG_REMOTE_HIGH;
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break;
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case hwmon_temp_crit:
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reg = MAX1619_REG_REMOTE_CRIT;
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break;
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case hwmon_temp_crit_hyst:
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reg = MAX1619_REG_REMOTE_CRIT_HYST;
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break;
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case hwmon_temp_min_alarm:
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alarm_bit = 3;
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break;
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case hwmon_temp_max_alarm:
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alarm_bit = 4;
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break;
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case hwmon_temp_crit_alarm:
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alarm_bit = 1;
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break;
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case hwmon_temp_fault:
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alarm_bit = 2;
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break;
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default:
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return -EOPNOTSUPP;
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}
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if (reg >= 0) {
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ret = regmap_read(regmap, reg, &temp);
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if (ret < 0)
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return ret;
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*val = sign_extend32(temp, 7) * 1000;
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} else {
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ret = get_alarms(regmap);
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if (ret < 0)
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return ret;
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*val = !!(ret & BIT(alarm_bit));
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}
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return 0;
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}
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static u16 update_intervals[] = { 16000, 8000, 4000, 2000, 1000, 500, 250, 125 };
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static int max1619_chip_read(struct regmap *regmap, u32 attr, long *val)
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{
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int alarms, ret;
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u32 regval;
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switch (attr) {
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case hwmon_chip_update_interval:
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ret = regmap_read(regmap, MAX1619_REG_CONVRATE, ®val);
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if (ret < 0)
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return ret;
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*val = update_intervals[regval & 7];
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break;
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case hwmon_chip_alarms:
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alarms = get_alarms(regmap);
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if (alarms < 0)
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return alarms;
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*val = alarms;
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int max1619_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 regmap *regmap = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_chip:
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return max1619_chip_read(regmap, attr, val);
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case hwmon_temp:
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return max1619_temp_read(regmap, 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 max1619_chip_write(struct regmap *regmap, 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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val = find_closest_descending(val, update_intervals, ARRAY_SIZE(update_intervals));
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return regmap_write(regmap, MAX1619_REG_CONVRATE, 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 max1619_temp_write(struct regmap *regmap,
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u32 attr, int channel, long val)
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{
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int reg;
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switch (attr) {
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case hwmon_temp_min:
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reg = MAX1619_REG_REMOTE_LOW;
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break;
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case hwmon_temp_max:
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reg = MAX1619_REG_REMOTE_HIGH;
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break;
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case hwmon_temp_crit:
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reg = MAX1619_REG_REMOTE_CRIT;
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break;
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case hwmon_temp_crit_hyst:
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reg = MAX1619_REG_REMOTE_CRIT_HYST;
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break;
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default:
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return -EOPNOTSUPP;
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}
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val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
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return regmap_write(regmap, reg, val);
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}
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static int max1619_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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struct regmap *regmap = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_chip:
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return max1619_chip_write(regmap, attr, val);
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case hwmon_temp:
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return max1619_temp_write(regmap, 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 max1619_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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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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case hwmon_chip_alarms:
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return 0444;
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default:
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break;
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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_min:
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case hwmon_temp_max:
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case hwmon_temp_crit:
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case hwmon_temp_crit_hyst:
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return 0644;
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case hwmon_temp_min_alarm:
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case hwmon_temp_max_alarm:
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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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default:
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break;
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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 * const max1619_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS | HWMON_C_UPDATE_INTERVAL),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT,
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HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
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HWMON_T_CRIT | HWMON_T_CRIT_HYST |
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HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
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HWMON_T_CRIT_ALARM | HWMON_T_FAULT),
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NULL
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};
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static const struct hwmon_ops max1619_hwmon_ops = {
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.is_visible = max1619_is_visible,
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.read = max1619_read,
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.write = max1619_write,
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};
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static const struct hwmon_chip_info max1619_chip_info = {
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.ops = &max1619_hwmon_ops,
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.info = max1619_info,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int max1619_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = client->adapter;
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int regval;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG);
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if (regval < 0 || (regval & 0x03))
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE);
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if (regval < 0 || regval > 0x07)
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS);
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if (regval < 0 || (regval & 0x61))
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID);
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if (regval != 0x4d)
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID);
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if (regval != 0x04)
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return -ENODEV;
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strscpy(info->type, "max1619", I2C_NAME_SIZE);
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return 0;
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}
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static int max1619_init_chip(struct regmap *regmap)
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{
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int ret;
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ret = regmap_write(regmap, MAX1619_REG_CONVRATE, 5); /* 2 Hz */
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if (ret)
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return ret;
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/* Start conversions */
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return regmap_clear_bits(regmap, MAX1619_REG_CONFIG, 0x40);
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}
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/* regmap */
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static int max1619_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(context, reg);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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}
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static int max1619_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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int offset = reg < MAX1619_REG_REMOTE_CRIT ? 6 : 2;
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return i2c_smbus_write_byte_data(context, reg + offset, val);
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}
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static bool max1619_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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return reg <= MAX1619_REG_STATUS;
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}
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static bool max1619_regmap_is_writeable(struct device *dev, unsigned int reg)
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{
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return reg > MAX1619_REG_STATUS && reg <= MAX1619_REG_REMOTE_CRIT_HYST;
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}
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static const struct regmap_config max1619_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX1619_REG_REMOTE_CRIT_HYST,
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.cache_type = REGCACHE_MAPLE,
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.volatile_reg = max1619_regmap_is_volatile,
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.writeable_reg = max1619_regmap_is_writeable,
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};
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static const struct regmap_bus max1619_regmap_bus = {
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.reg_write = max1619_reg_write,
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.reg_read = max1619_reg_read,
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};
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static int max1619_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 regmap *regmap;
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int ret;
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regmap = devm_regmap_init(dev, &max1619_regmap_bus, client,
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&max1619_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ret = max1619_init_chip(regmap);
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if (ret)
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return ret;
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
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regmap, &max1619_chip_info, NULL);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct i2c_device_id max1619_id[] = {
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{ "max1619" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max1619_id);
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#ifdef CONFIG_OF
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static const struct of_device_id max1619_of_match[] = {
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{ .compatible = "maxim,max1619", },
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{},
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};
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MODULE_DEVICE_TABLE(of, max1619_of_match);
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#endif
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static struct i2c_driver max1619_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "max1619",
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.of_match_table = of_match_ptr(max1619_of_match),
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},
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.probe = max1619_probe,
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.id_table = max1619_id,
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.detect = max1619_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(max1619_driver);
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MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("MAX1619 sensor driver");
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MODULE_LICENSE("GPL");
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