| /* |
| * lm90.c - Part of lm_sensors, Linux kernel modules for hardware |
| * monitoring |
| * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org> |
| * |
| * Based on the lm83 driver. The LM90 is a sensor chip made by National |
| * Semiconductor. It reports up to two temperatures (its own plus up to |
| * one external one) with a 0.125 deg resolution (1 deg for local |
| * temperature) and a 3-4 deg accuracy. |
| * |
| * This driver also supports the LM89 and LM99, two other sensor chips |
| * made by National Semiconductor. Both have an increased remote |
| * temperature measurement accuracy (1 degree), and the LM99 |
| * additionally shifts remote temperatures (measured and limits) by 16 |
| * degrees, which allows for higher temperatures measurement. |
| * Note that there is no way to differentiate between both chips. |
| * When device is auto-detected, the driver will assume an LM99. |
| * |
| * This driver also supports the LM86, another sensor chip made by |
| * National Semiconductor. It is exactly similar to the LM90 except it |
| * has a higher accuracy. |
| * |
| * This driver also supports the ADM1032, a sensor chip made by Analog |
| * Devices. That chip is similar to the LM90, with a few differences |
| * that are not handled by this driver. Among others, it has a higher |
| * accuracy than the LM90, much like the LM86 does. |
| * |
| * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor |
| * chips made by Maxim. These chips are similar to the LM86. |
| * Note that there is no easy way to differentiate between the three |
| * variants. The extra address and features of the MAX6659 are not |
| * supported by this driver. These chips lack the remote temperature |
| * offset feature. |
| * |
| * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and |
| * MAX6692 chips made by Maxim. These are again similar to the LM86, |
| * but they use unsigned temperature values and can report temperatures |
| * from 0 to 145 degrees. |
| * |
| * This driver also supports the MAX6680 and MAX6681, two other sensor |
| * chips made by Maxim. These are quite similar to the other Maxim |
| * chips. The MAX6680 and MAX6681 only differ in the pinout so they can |
| * be treated identically. |
| * |
| * This driver also supports the ADT7461 chip from Analog Devices. |
| * It's supported in both compatibility and extended mode. It is mostly |
| * compatible with LM90 except for a data format difference for the |
| * temperature value registers. |
| * |
| * Since the LM90 was the first chipset supported by this driver, most |
| * comments will refer to this chipset, but are actually general and |
| * concern all supported chipsets, unless mentioned otherwise. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/jiffies.h> |
| #include <linux/i2c.h> |
| #include <linux/hwmon-sysfs.h> |
| #include <linux/hwmon.h> |
| #include <linux/err.h> |
| #include <linux/mutex.h> |
| #include <linux/sysfs.h> |
| |
| /* |
| * Addresses to scan |
| * Address is fully defined internally and cannot be changed except for |
| * MAX6659, MAX6680 and MAX6681. |
| * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6649, MAX6657 |
| * and MAX6658 have address 0x4c. |
| * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d. |
| * MAX6647 has address 0x4e. |
| * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
| * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
| * 0x4c, 0x4d or 0x4e. |
| */ |
| |
| static const unsigned short normal_i2c[] = { |
| 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
| |
| /* |
| * Insmod parameters |
| */ |
| |
| I2C_CLIENT_INSMOD_8(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, |
| max6646); |
| |
| /* |
| * The LM90 registers |
| */ |
| |
| #define LM90_REG_R_MAN_ID 0xFE |
| #define LM90_REG_R_CHIP_ID 0xFF |
| #define LM90_REG_R_CONFIG1 0x03 |
| #define LM90_REG_W_CONFIG1 0x09 |
| #define LM90_REG_R_CONFIG2 0xBF |
| #define LM90_REG_W_CONFIG2 0xBF |
| #define LM90_REG_R_CONVRATE 0x04 |
| #define LM90_REG_W_CONVRATE 0x0A |
| #define LM90_REG_R_STATUS 0x02 |
| #define LM90_REG_R_LOCAL_TEMP 0x00 |
| #define LM90_REG_R_LOCAL_HIGH 0x05 |
| #define LM90_REG_W_LOCAL_HIGH 0x0B |
| #define LM90_REG_R_LOCAL_LOW 0x06 |
| #define LM90_REG_W_LOCAL_LOW 0x0C |
| #define LM90_REG_R_LOCAL_CRIT 0x20 |
| #define LM90_REG_W_LOCAL_CRIT 0x20 |
| #define LM90_REG_R_REMOTE_TEMPH 0x01 |
| #define LM90_REG_R_REMOTE_TEMPL 0x10 |
| #define LM90_REG_R_REMOTE_OFFSH 0x11 |
| #define LM90_REG_W_REMOTE_OFFSH 0x11 |
| #define LM90_REG_R_REMOTE_OFFSL 0x12 |
| #define LM90_REG_W_REMOTE_OFFSL 0x12 |
| #define LM90_REG_R_REMOTE_HIGHH 0x07 |
| #define LM90_REG_W_REMOTE_HIGHH 0x0D |
| #define LM90_REG_R_REMOTE_HIGHL 0x13 |
| #define LM90_REG_W_REMOTE_HIGHL 0x13 |
| #define LM90_REG_R_REMOTE_LOWH 0x08 |
| #define LM90_REG_W_REMOTE_LOWH 0x0E |
| #define LM90_REG_R_REMOTE_LOWL 0x14 |
| #define LM90_REG_W_REMOTE_LOWL 0x14 |
| #define LM90_REG_R_REMOTE_CRIT 0x19 |
| #define LM90_REG_W_REMOTE_CRIT 0x19 |
| #define LM90_REG_R_TCRIT_HYST 0x21 |
| #define LM90_REG_W_TCRIT_HYST 0x21 |
| |
| /* MAX6646/6647/6649/6657/6658/6659 registers */ |
| |
| #define MAX6657_REG_R_LOCAL_TEMPL 0x11 |
| |
| /* |
| * Device flags |
| */ |
| #define LM90_FLAG_ADT7461_EXT 0x01 /* ADT7461 extended mode */ |
| |
| /* |
| * Functions declaration |
| */ |
| |
| static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info); |
| static int lm90_probe(struct i2c_client *client, |
| const struct i2c_device_id *id); |
| static void lm90_init_client(struct i2c_client *client); |
| static int lm90_remove(struct i2c_client *client); |
| static struct lm90_data *lm90_update_device(struct device *dev); |
| |
| /* |
| * Driver data (common to all clients) |
| */ |
| |
| static const struct i2c_device_id lm90_id[] = { |
| { "adm1032", adm1032 }, |
| { "adt7461", adt7461 }, |
| { "lm90", lm90 }, |
| { "lm86", lm86 }, |
| { "lm89", lm86 }, |
| { "lm99", lm99 }, |
| { "max6646", max6646 }, |
| { "max6647", max6646 }, |
| { "max6649", max6646 }, |
| { "max6657", max6657 }, |
| { "max6658", max6657 }, |
| { "max6659", max6657 }, |
| { "max6680", max6680 }, |
| { "max6681", max6680 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, lm90_id); |
| |
| static struct i2c_driver lm90_driver = { |
| .class = I2C_CLASS_HWMON, |
| .driver = { |
| .name = "lm90", |
| }, |
| .probe = lm90_probe, |
| .remove = lm90_remove, |
| .id_table = lm90_id, |
| .detect = lm90_detect, |
| .address_data = &addr_data, |
| }; |
| |
| /* |
| * Client data (each client gets its own) |
| */ |
| |
| struct lm90_data { |
| struct device *hwmon_dev; |
| struct mutex update_lock; |
| char valid; /* zero until following fields are valid */ |
| unsigned long last_updated; /* in jiffies */ |
| int kind; |
| int flags; |
| |
| /* registers values */ |
| s8 temp8[4]; /* 0: local low limit |
| 1: local high limit |
| 2: local critical limit |
| 3: remote critical limit */ |
| s16 temp11[5]; /* 0: remote input |
| 1: remote low limit |
| 2: remote high limit |
| 3: remote offset (except max6646 and max6657) |
| 4: local input */ |
| u8 temp_hyst; |
| u8 alarms; /* bitvector */ |
| }; |
| |
| /* |
| * Conversions |
| * For local temperatures and limits, critical limits and the hysteresis |
| * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
| * For remote temperatures and limits, it uses signed 11-bit values with |
| * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some |
| * Maxim chips use unsigned values. |
| */ |
| |
| static inline int temp_from_s8(s8 val) |
| { |
| return val * 1000; |
| } |
| |
| static inline int temp_from_u8(u8 val) |
| { |
| return val * 1000; |
| } |
| |
| static inline int temp_from_s16(s16 val) |
| { |
| return val / 32 * 125; |
| } |
| |
| static inline int temp_from_u16(u16 val) |
| { |
| return val / 32 * 125; |
| } |
| |
| static s8 temp_to_s8(long val) |
| { |
| if (val <= -128000) |
| return -128; |
| if (val >= 127000) |
| return 127; |
| if (val < 0) |
| return (val - 500) / 1000; |
| return (val + 500) / 1000; |
| } |
| |
| static u8 temp_to_u8(long val) |
| { |
| if (val <= 0) |
| return 0; |
| if (val >= 255000) |
| return 255; |
| return (val + 500) / 1000; |
| } |
| |
| static s16 temp_to_s16(long val) |
| { |
| if (val <= -128000) |
| return 0x8000; |
| if (val >= 127875) |
| return 0x7FE0; |
| if (val < 0) |
| return (val - 62) / 125 * 32; |
| return (val + 62) / 125 * 32; |
| } |
| |
| static u8 hyst_to_reg(long val) |
| { |
| if (val <= 0) |
| return 0; |
| if (val >= 30500) |
| return 31; |
| return (val + 500) / 1000; |
| } |
| |
| /* |
| * ADT7461 in compatibility mode is almost identical to LM90 except that |
| * attempts to write values that are outside the range 0 < temp < 127 are |
| * treated as the boundary value. |
| * |
| * ADT7461 in "extended mode" operation uses unsigned integers offset by |
| * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. |
| */ |
| static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) |
| { |
| if (data->flags & LM90_FLAG_ADT7461_EXT) |
| return (val - 64) * 1000; |
| else |
| return temp_from_s8(val); |
| } |
| |
| static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) |
| { |
| if (data->flags & LM90_FLAG_ADT7461_EXT) |
| return (val - 0x4000) / 64 * 250; |
| else |
| return temp_from_s16(val); |
| } |
| |
| static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) |
| { |
| if (data->flags & LM90_FLAG_ADT7461_EXT) { |
| if (val <= -64000) |
| return 0; |
| if (val >= 191000) |
| return 0xFF; |
| return (val + 500 + 64000) / 1000; |
| } else { |
| if (val <= 0) |
| return 0; |
| if (val >= 127000) |
| return 127; |
| return (val + 500) / 1000; |
| } |
| } |
| |
| static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) |
| { |
| if (data->flags & LM90_FLAG_ADT7461_EXT) { |
| if (val <= -64000) |
| return 0; |
| if (val >= 191750) |
| return 0xFFC0; |
| return (val + 64000 + 125) / 250 * 64; |
| } else { |
| if (val <= 0) |
| return 0; |
| if (val >= 127750) |
| return 0x7FC0; |
| return (val + 125) / 250 * 64; |
| } |
| } |
| |
| /* |
| * Sysfs stuff |
| */ |
| |
| static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct lm90_data *data = lm90_update_device(dev); |
| int temp; |
| |
| if (data->kind == adt7461) |
| temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
| else if (data->kind == max6646) |
| temp = temp_from_u8(data->temp8[attr->index]); |
| else |
| temp = temp_from_s8(data->temp8[attr->index]); |
| |
| /* +16 degrees offset for temp2 for the LM99 */ |
| if (data->kind == lm99 && attr->index == 3) |
| temp += 16000; |
| |
| return sprintf(buf, "%d\n", temp); |
| } |
| |
| static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, |
| const char *buf, size_t count) |
| { |
| static const u8 reg[4] = { |
| LM90_REG_W_LOCAL_LOW, |
| LM90_REG_W_LOCAL_HIGH, |
| LM90_REG_W_LOCAL_CRIT, |
| LM90_REG_W_REMOTE_CRIT, |
| }; |
| |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct i2c_client *client = to_i2c_client(dev); |
| struct lm90_data *data = i2c_get_clientdata(client); |
| long val = simple_strtol(buf, NULL, 10); |
| int nr = attr->index; |
| |
| /* +16 degrees offset for temp2 for the LM99 */ |
| if (data->kind == lm99 && attr->index == 3) |
| val -= 16000; |
| |
| mutex_lock(&data->update_lock); |
| if (data->kind == adt7461) |
| data->temp8[nr] = temp_to_u8_adt7461(data, val); |
| else if (data->kind == max6646) |
| data->temp8[nr] = temp_to_u8(val); |
| else |
| data->temp8[nr] = temp_to_s8(val); |
| i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); |
| mutex_unlock(&data->update_lock); |
| return count; |
| } |
| |
| static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct lm90_data *data = lm90_update_device(dev); |
| int temp; |
| |
| if (data->kind == adt7461) |
| temp = temp_from_u16_adt7461(data, data->temp11[attr->index]); |
| else if (data->kind == max6646) |
| temp = temp_from_u16(data->temp11[attr->index]); |
| else |
| temp = temp_from_s16(data->temp11[attr->index]); |
| |
| /* +16 degrees offset for temp2 for the LM99 */ |
| if (data->kind == lm99 && attr->index <= 2) |
| temp += 16000; |
| |
| return sprintf(buf, "%d\n", temp); |
| } |
| |
| static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, |
| const char *buf, size_t count) |
| { |
| static const u8 reg[6] = { |
| LM90_REG_W_REMOTE_LOWH, |
| LM90_REG_W_REMOTE_LOWL, |
| LM90_REG_W_REMOTE_HIGHH, |
| LM90_REG_W_REMOTE_HIGHL, |
| LM90_REG_W_REMOTE_OFFSH, |
| LM90_REG_W_REMOTE_OFFSL, |
| }; |
| |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct i2c_client *client = to_i2c_client(dev); |
| struct lm90_data *data = i2c_get_clientdata(client); |
| long val = simple_strtol(buf, NULL, 10); |
| int nr = attr->index; |
| |
| /* +16 degrees offset for temp2 for the LM99 */ |
| if (data->kind == lm99 && attr->index <= 2) |
| val -= 16000; |
| |
| mutex_lock(&data->update_lock); |
| if (data->kind == adt7461) |
| data->temp11[nr] = temp_to_u16_adt7461(data, val); |
| else if (data->kind == max6657 || data->kind == max6680) |
| data->temp11[nr] = temp_to_s8(val) << 8; |
| else if (data->kind == max6646) |
| data->temp11[nr] = temp_to_u8(val) << 8; |
| else |
| data->temp11[nr] = temp_to_s16(val); |
| |
| i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], |
| data->temp11[nr] >> 8); |
| if (data->kind != max6657 && data->kind != max6680 |
| && data->kind != max6646) |
| i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], |
| data->temp11[nr] & 0xff); |
| mutex_unlock(&data->update_lock); |
| return count; |
| } |
| |
| static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct lm90_data *data = lm90_update_device(dev); |
| int temp; |
| |
| if (data->kind == adt7461) |
| temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
| else if (data->kind == max6646) |
| temp = temp_from_u8(data->temp8[attr->index]); |
| else |
| temp = temp_from_s8(data->temp8[attr->index]); |
| |
| /* +16 degrees offset for temp2 for the LM99 */ |
| if (data->kind == lm99 && attr->index == 3) |
| temp += 16000; |
| |
| return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst)); |
| } |
| |
| static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
| const char *buf, size_t count) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct lm90_data *data = i2c_get_clientdata(client); |
| long val = simple_strtol(buf, NULL, 10); |
| int temp; |
| |
| mutex_lock(&data->update_lock); |
| if (data->kind == adt7461) |
| temp = temp_from_u8_adt7461(data, data->temp8[2]); |
| else if (data->kind == max6646) |
| temp = temp_from_u8(data->temp8[2]); |
| else |
| temp = temp_from_s8(data->temp8[2]); |
| |
| data->temp_hyst = hyst_to_reg(temp - val); |
| i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
| data->temp_hyst); |
| mutex_unlock(&data->update_lock); |
| return count; |
| } |
| |
| static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
| char *buf) |
| { |
| struct lm90_data *data = lm90_update_device(dev); |
| return sprintf(buf, "%d\n", data->alarms); |
| } |
| |
| static ssize_t show_alarm(struct device *dev, struct device_attribute |
| *devattr, char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct lm90_data *data = lm90_update_device(dev); |
| int bitnr = attr->index; |
| |
| return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
| } |
| |
| static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4); |
| static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); |
| static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, |
| set_temp8, 0); |
| static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, |
| set_temp11, 1); |
| static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, |
| set_temp8, 1); |
| static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, |
| set_temp11, 2); |
| static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, |
| set_temp8, 2); |
| static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, |
| set_temp8, 3); |
| static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, |
| set_temphyst, 2); |
| static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3); |
| static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
| set_temp11, 3); |
| |
| /* Individual alarm files */ |
| static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); |
| static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
| static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
| static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
| static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
| static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); |
| static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); |
| /* Raw alarm file for compatibility */ |
| static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
| |
| static struct attribute *lm90_attributes[] = { |
| &sensor_dev_attr_temp1_input.dev_attr.attr, |
| &sensor_dev_attr_temp2_input.dev_attr.attr, |
| &sensor_dev_attr_temp1_min.dev_attr.attr, |
| &sensor_dev_attr_temp2_min.dev_attr.attr, |
| &sensor_dev_attr_temp1_max.dev_attr.attr, |
| &sensor_dev_attr_temp2_max.dev_attr.attr, |
| &sensor_dev_attr_temp1_crit.dev_attr.attr, |
| &sensor_dev_attr_temp2_crit.dev_attr.attr, |
| &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, |
| &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, |
| |
| &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp2_fault.dev_attr.attr, |
| &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
| &dev_attr_alarms.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group lm90_group = { |
| .attrs = lm90_attributes, |
| }; |
| |
| /* pec used for ADM1032 only */ |
| static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); |
| } |
| |
| static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, |
| const char *buf, size_t count) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| long val = simple_strtol(buf, NULL, 10); |
| |
| switch (val) { |
| case 0: |
| client->flags &= ~I2C_CLIENT_PEC; |
| break; |
| case 1: |
| client->flags |= I2C_CLIENT_PEC; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return count; |
| } |
| |
| static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); |
| |
| /* |
| * Real code |
| */ |
| |
| /* The ADM1032 supports PEC but not on write byte transactions, so we need |
| to explicitly ask for a transaction without PEC. */ |
| static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
| { |
| return i2c_smbus_xfer(client->adapter, client->addr, |
| client->flags & ~I2C_CLIENT_PEC, |
| I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); |
| } |
| |
| /* It is assumed that client->update_lock is held (unless we are in |
| detection or initialization steps). This matters when PEC is enabled, |
| because we don't want the address pointer to change between the write |
| byte and the read byte transactions. */ |
| static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
| { |
| int err; |
| |
| if (client->flags & I2C_CLIENT_PEC) { |
| err = adm1032_write_byte(client, reg); |
| if (err >= 0) |
| err = i2c_smbus_read_byte(client); |
| } else |
| err = i2c_smbus_read_byte_data(client, reg); |
| |
| if (err < 0) { |
| dev_warn(&client->dev, "Register %#02x read failed (%d)\n", |
| reg, err); |
| return err; |
| } |
| *value = err; |
| |
| return 0; |
| } |
| |
| /* Return 0 if detection is successful, -ENODEV otherwise */ |
| static int lm90_detect(struct i2c_client *new_client, |
| struct i2c_board_info *info) |
| { |
| struct i2c_adapter *adapter = new_client->adapter; |
| int address = new_client->addr; |
| const char *name = NULL; |
| int man_id, chip_id, reg_config1, reg_convrate; |
| |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| return -ENODEV; |
| |
| /* detection and identification */ |
| if ((man_id = i2c_smbus_read_byte_data(new_client, |
| LM90_REG_R_MAN_ID)) < 0 |
| || (chip_id = i2c_smbus_read_byte_data(new_client, |
| LM90_REG_R_CHIP_ID)) < 0 |
| || (reg_config1 = i2c_smbus_read_byte_data(new_client, |
| LM90_REG_R_CONFIG1)) < 0 |
| || (reg_convrate = i2c_smbus_read_byte_data(new_client, |
| LM90_REG_R_CONVRATE)) < 0) |
| return -ENODEV; |
| |
| if ((address == 0x4C || address == 0x4D) |
| && man_id == 0x01) { /* National Semiconductor */ |
| int reg_config2; |
| |
| reg_config2 = i2c_smbus_read_byte_data(new_client, |
| LM90_REG_R_CONFIG2); |
| if (reg_config2 < 0) |
| return -ENODEV; |
| |
| if ((reg_config1 & 0x2A) == 0x00 |
| && (reg_config2 & 0xF8) == 0x00 |
| && reg_convrate <= 0x09) { |
| if (address == 0x4C |
| && (chip_id & 0xF0) == 0x20) { /* LM90 */ |
| name = "lm90"; |
| } else |
| if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ |
| name = "lm99"; |
| dev_info(&adapter->dev, |
| "Assuming LM99 chip at 0x%02x\n", |
| address); |
| dev_info(&adapter->dev, |
| "If it is an LM89, instantiate it " |
| "with the new_device sysfs " |
| "interface\n"); |
| } else |
| if (address == 0x4C |
| && (chip_id & 0xF0) == 0x10) { /* LM86 */ |
| name = "lm86"; |
| } |
| } |
| } else |
| if ((address == 0x4C || address == 0x4D) |
| && man_id == 0x41) { /* Analog Devices */ |
| if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
| && (reg_config1 & 0x3F) == 0x00 |
| && reg_convrate <= 0x0A) { |
| name = "adm1032"; |
| /* The ADM1032 supports PEC, but only if combined |
| transactions are not used. */ |
| if (i2c_check_functionality(adapter, |
| I2C_FUNC_SMBUS_BYTE)) |
| info->flags |= I2C_CLIENT_PEC; |
| } else |
| if (chip_id == 0x51 /* ADT7461 */ |
| && (reg_config1 & 0x1B) == 0x00 |
| && reg_convrate <= 0x0A) { |
| name = "adt7461"; |
| } |
| } else |
| if (man_id == 0x4D) { /* Maxim */ |
| /* |
| * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id |
| * register. Reading from that address will return the last |
| * read value, which in our case is those of the man_id |
| * register. Likewise, the config1 register seems to lack a |
| * low nibble, so the value will be those of the previous |
| * read, so in our case those of the man_id register. |
| */ |
| if (chip_id == man_id |
| && (address == 0x4C || address == 0x4D) |
| && (reg_config1 & 0x1F) == (man_id & 0x0F) |
| && reg_convrate <= 0x09) { |
| name = "max6657"; |
| } else |
| /* |
| * The chip_id register of the MAX6680 and MAX6681 holds the |
| * revision of the chip. The lowest bit of the config1 register |
| * is unused and should return zero when read, so should the |
| * second to last bit of config1 (software reset). |
| */ |
| if (chip_id == 0x01 |
| && (reg_config1 & 0x03) == 0x00 |
| && reg_convrate <= 0x07) { |
| name = "max6680"; |
| } else |
| /* |
| * The chip_id register of the MAX6646/6647/6649 holds the |
| * revision of the chip. The lowest 6 bits of the config1 |
| * register are unused and should return zero when read. |
| */ |
| if (chip_id == 0x59 |
| && (reg_config1 & 0x3f) == 0x00 |
| && reg_convrate <= 0x07) { |
| name = "max6646"; |
| } |
| } |
| |
| if (!name) { /* identification failed */ |
| dev_dbg(&adapter->dev, |
| "Unsupported chip at 0x%02x (man_id=0x%02X, " |
| "chip_id=0x%02X)\n", address, man_id, chip_id); |
| return -ENODEV; |
| } |
| |
| strlcpy(info->type, name, I2C_NAME_SIZE); |
| |
| return 0; |
| } |
| |
| static int lm90_probe(struct i2c_client *new_client, |
| const struct i2c_device_id *id) |
| { |
| struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); |
| struct lm90_data *data; |
| int err; |
| |
| data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
| if (!data) { |
| err = -ENOMEM; |
| goto exit; |
| } |
| i2c_set_clientdata(new_client, data); |
| mutex_init(&data->update_lock); |
| |
| /* Set the device type */ |
| data->kind = id->driver_data; |
| if (data->kind == adm1032) { |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) |
| new_client->flags &= ~I2C_CLIENT_PEC; |
| } |
| |
| /* Initialize the LM90 chip */ |
| lm90_init_client(new_client); |
| |
| /* Register sysfs hooks */ |
| if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
| goto exit_free; |
| if (new_client->flags & I2C_CLIENT_PEC) { |
| if ((err = device_create_file(&new_client->dev, |
| &dev_attr_pec))) |
| goto exit_remove_files; |
| } |
| if (data->kind != max6657 && data->kind != max6646) { |
| if ((err = device_create_file(&new_client->dev, |
| &sensor_dev_attr_temp2_offset.dev_attr))) |
| goto exit_remove_files; |
| } |
| |
| data->hwmon_dev = hwmon_device_register(&new_client->dev); |
| if (IS_ERR(data->hwmon_dev)) { |
| err = PTR_ERR(data->hwmon_dev); |
| goto exit_remove_files; |
| } |
| |
| return 0; |
| |
| exit_remove_files: |
| sysfs_remove_group(&new_client->dev.kobj, &lm90_group); |
| device_remove_file(&new_client->dev, &dev_attr_pec); |
| exit_free: |
| kfree(data); |
| exit: |
| return err; |
| } |
| |
| static void lm90_init_client(struct i2c_client *client) |
| { |
| u8 config, config_orig; |
| struct lm90_data *data = i2c_get_clientdata(client); |
| |
| /* |
| * Start the conversions. |
| */ |
| i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, |
| 5); /* 2 Hz */ |
| if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
| dev_warn(&client->dev, "Initialization failed!\n"); |
| return; |
| } |
| config_orig = config; |
| |
| /* Check Temperature Range Select */ |
| if (data->kind == adt7461) { |
| if (config & 0x04) |
| data->flags |= LM90_FLAG_ADT7461_EXT; |
| } |
| |
| /* |
| * Put MAX6680/MAX8881 into extended resolution (bit 0x10, |
| * 0.125 degree resolution) and range (0x08, extend range |
| * to -64 degree) mode for the remote temperature sensor. |
| */ |
| if (data->kind == max6680) { |
| config |= 0x18; |
| } |
| |
| config &= 0xBF; /* run */ |
| if (config != config_orig) /* Only write if changed */ |
| i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); |
| } |
| |
| static int lm90_remove(struct i2c_client *client) |
| { |
| struct lm90_data *data = i2c_get_clientdata(client); |
| |
| hwmon_device_unregister(data->hwmon_dev); |
| sysfs_remove_group(&client->dev.kobj, &lm90_group); |
| device_remove_file(&client->dev, &dev_attr_pec); |
| if (data->kind != max6657 && data->kind != max6646) |
| device_remove_file(&client->dev, |
| &sensor_dev_attr_temp2_offset.dev_attr); |
| |
| kfree(data); |
| return 0; |
| } |
| |
| static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
| { |
| int err; |
| u8 oldh, newh, l; |
| |
| /* |
| * There is a trick here. We have to read two registers to have the |
| * sensor temperature, but we have to beware a conversion could occur |
| * inbetween the readings. The datasheet says we should either use |
| * the one-shot conversion register, which we don't want to do |
| * (disables hardware monitoring) or monitor the busy bit, which is |
| * impossible (we can't read the values and monitor that bit at the |
| * exact same time). So the solution used here is to read the high |
| * byte once, then the low byte, then the high byte again. If the new |
| * high byte matches the old one, then we have a valid reading. Else |
| * we have to read the low byte again, and now we believe we have a |
| * correct reading. |
| */ |
| if ((err = lm90_read_reg(client, regh, &oldh)) |
| || (err = lm90_read_reg(client, regl, &l)) |
| || (err = lm90_read_reg(client, regh, &newh))) |
| return err; |
| if (oldh != newh) { |
| err = lm90_read_reg(client, regl, &l); |
| if (err) |
| return err; |
| } |
| *value = (newh << 8) | l; |
| |
| return 0; |
| } |
| |
| static struct lm90_data *lm90_update_device(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct lm90_data *data = i2c_get_clientdata(client); |
| |
| mutex_lock(&data->update_lock); |
| |
| if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
| u8 h, l; |
| |
| dev_dbg(&client->dev, "Updating lm90 data.\n"); |
| lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); |
| lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); |
| lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); |
| lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); |
| lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); |
| |
| if (data->kind == max6657 || data->kind == max6646) { |
| lm90_read16(client, LM90_REG_R_LOCAL_TEMP, |
| MAX6657_REG_R_LOCAL_TEMPL, |
| &data->temp11[4]); |
| } else { |
| if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, |
| &h) == 0) |
| data->temp11[4] = h << 8; |
| } |
| lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
| LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); |
| |
| if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { |
| data->temp11[1] = h << 8; |
| if (data->kind != max6657 && data->kind != max6680 |
| && data->kind != max6646 |
| && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, |
| &l) == 0) |
| data->temp11[1] |= l; |
| } |
| if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { |
| data->temp11[2] = h << 8; |
| if (data->kind != max6657 && data->kind != max6680 |
| && data->kind != max6646 |
| && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, |
| &l) == 0) |
| data->temp11[2] |= l; |
| } |
| |
| if (data->kind != max6657 && data->kind != max6646) { |
| if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, |
| &h) == 0 |
| && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
| &l) == 0) |
| data->temp11[3] = (h << 8) | l; |
| } |
| lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
| |
| data->last_updated = jiffies; |
| data->valid = 1; |
| } |
| |
| mutex_unlock(&data->update_lock); |
| |
| return data; |
| } |
| |
| static int __init sensors_lm90_init(void) |
| { |
| return i2c_add_driver(&lm90_driver); |
| } |
| |
| static void __exit sensors_lm90_exit(void) |
| { |
| i2c_del_driver(&lm90_driver); |
| } |
| |
| MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); |
| MODULE_DESCRIPTION("LM90/ADM1032 driver"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(sensors_lm90_init); |
| module_exit(sensors_lm90_exit); |