^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * lm92 - Hardware monitoring driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2005-2008 Jean Delvare <jdelvare@suse.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Based on the lm90 driver, with some ideas taken from the lm_sensors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * lm92 driver as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * The LM92 is a sensor chip made by National Semiconductor. It reports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * its own temperature with a 0.0625 deg resolution and a 0.33 deg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * accuracy. Complete datasheet can be obtained from National's website
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * at:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * http://www.national.com/pf/LM/LM92.html
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * This driver also supports the MAX6635 sensor chip made by Maxim.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * This chip is compatible with the LM92, but has a lesser accuracy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * (1.0 deg). Complete datasheet can be obtained from Maxim's website
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * at:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Since the LM92 was the first chipset supported by this driver, most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * comments will refer to this chipset, but are actually general and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * concern all supported chipsets, unless mentioned otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Support could easily be added for the National Semiconductor LM76
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * with the LM92.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * The LM92 and MAX6635 have 2 two-state pins for address selection,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * resulting in 4 possible addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) I2C_CLIENT_END };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) enum chips { lm92, max6635 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* The LM92 registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define LM92_REG_TEMP 0x00 /* 16-bit, RO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * left-justified in 16-bit registers. No rounding is done, with such
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * a resolution it's just not worth it. Note that the MAX6635 doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * make use of the 4 lower bits for limits (i.e. effective resolution
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * for limits is 1 degree Celsius).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static inline int TEMP_FROM_REG(s16 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return reg / 8 * 625 / 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static inline s16 TEMP_TO_REG(long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) val = clamp_val(val, -60000, 160000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return val * 10 / 625 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* Alarm flags are stored in the 3 LSB of the temperature register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static inline u8 ALARMS_FROM_REG(s16 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return reg & 0x0007;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) enum temp_index {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) t_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) t_crit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) t_min,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) t_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) t_hyst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) t_num_regs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static const u8 regs[t_num_regs] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) [t_input] = LM92_REG_TEMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) [t_crit] = LM92_REG_TEMP_CRIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) [t_min] = LM92_REG_TEMP_LOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) [t_max] = LM92_REG_TEMP_HIGH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) [t_hyst] = LM92_REG_TEMP_HYST,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Client data (each client gets its own) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct lm92_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct mutex update_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) char valid; /* zero until following fields are valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unsigned long last_updated; /* in jiffies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* registers values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) s16 temp[t_num_regs]; /* index with enum temp_index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Sysfs attributes and callback functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static struct lm92_data *lm92_update_device(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct lm92_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mutex_lock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (time_after(jiffies, data->last_updated + HZ) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) !data->valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) dev_dbg(&client->dev, "Updating lm92 data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) for (i = 0; i < t_num_regs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) data->temp[i] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) i2c_smbus_read_word_swapped(client, regs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) data->last_updated = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) data->valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) mutex_unlock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct lm92_data *data = lm92_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static ssize_t temp_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct device_attribute *devattr, const char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct lm92_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) int nr = attr->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) err = kstrtol(buf, 10, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mutex_lock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) data->temp[nr] = TEMP_TO_REG(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) i2c_smbus_write_word_swapped(client, regs[nr], data->temp[nr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) mutex_unlock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static ssize_t temp_hyst_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct device_attribute *devattr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct lm92_data *data = lm92_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) - TEMP_FROM_REG(data->temp[t_hyst]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static ssize_t temp1_min_hyst_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct lm92_data *data = lm92_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[t_min])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) + TEMP_FROM_REG(data->temp[t_hyst]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static ssize_t temp_hyst_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct device_attribute *devattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct lm92_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) err = kstrtol(buf, 10, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) val = clamp_val(val, -120000, 220000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) mutex_lock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) data->temp[t_hyst] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) TEMP_TO_REG(TEMP_FROM_REG(data->temp[attr->index]) - val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) i2c_smbus_write_word_swapped(client, LM92_REG_TEMP_HYST,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) data->temp[t_hyst]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) mutex_unlock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct lm92_data *data = lm92_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp[t_input]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int bitnr = to_sensor_dev_attr(attr)->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct lm92_data *data = lm92_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return sprintf(buf, "%d\n", (data->temp[t_input] >> bitnr) & 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_crit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_hyst, t_crit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, t_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static DEVICE_ATTR_RO(temp1_min_hyst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, temp_hyst, t_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static DEVICE_ATTR_RO(alarms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * Detection and registration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static void lm92_init_client(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) u8 config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /* Start the conversions if needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (config & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) config & 0xFE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static struct attribute *lm92_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) &sensor_dev_attr_temp1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) &sensor_dev_attr_temp1_crit.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) &sensor_dev_attr_temp1_min.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) &dev_attr_temp1_min_hyst.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) &sensor_dev_attr_temp1_max.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) &dev_attr_alarms.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) ATTRIBUTE_GROUPS(lm92);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* Return 0 if detection is successful, -ENODEV otherwise */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static int lm92_detect(struct i2c_client *new_client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) struct i2c_board_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct i2c_adapter *adapter = new_client->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) u8 config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) u16 man_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) | I2C_FUNC_SMBUS_WORD_DATA))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) config = i2c_smbus_read_byte_data(new_client, LM92_REG_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) man_id = i2c_smbus_read_word_data(new_client, LM92_REG_MAN_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if ((config & 0xe0) == 0x00 && man_id == 0x0180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) pr_info("lm92: Found National Semiconductor LM92 chip\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) strlcpy(info->type, "lm92", I2C_NAME_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static int lm92_probe(struct i2c_client *new_client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) struct lm92_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) data = devm_kzalloc(&new_client->dev, sizeof(struct lm92_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) data->client = new_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) mutex_init(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Initialize the chipset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) lm92_init_client(new_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) new_client->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) data, lm92_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return PTR_ERR_OR_ZERO(hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * Module and driver stuff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static const struct i2c_device_id lm92_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) { "lm92", lm92 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) { "max6635", max6635 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) MODULE_DEVICE_TABLE(i2c, lm92_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static struct i2c_driver lm92_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) .class = I2C_CLASS_HWMON,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) .name = "lm92",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) .probe_new = lm92_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) .id_table = lm92_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) .detect = lm92_detect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) .address_list = normal_i2c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) module_i2c_driver(lm92_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) MODULE_DESCRIPTION("LM92/MAX6635 driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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