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| -rw-r--r-- | drivers/hwmon/lm90.c | 1963 |
1 files changed, 1963 insertions, 0 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c new file mode 100644 index 000000000..033c89f83 --- /dev/null +++ b/drivers/hwmon/lm90.c @@ -0,0 +1,1963 @@ +/* + * lm90.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de> + * + * 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. We use the device address to detect MAX6659, which will result + * in a detection as max6657 if it is on address 0x4c. The extra address + * and features of the MAX6659 are only supported if the chip is configured + * explicitly as max6659, or if its address is not 0x4c. + * 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 MAX6695 and MAX6696, two other sensor + * chips made by Maxim. These are also quite similar to other Maxim + * chips, but support three temperature sensors instead of two. MAX6695 + * and MAX6696 only differ in the pinout so they can be treated identically. + * + * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as + * NCT1008 from ON Semiconductor. The chips are supported in both compatibility + * and extended mode. They are mostly compatible with LM90 except for a data + * format difference for the temperature value registers. + * + * This driver also supports the SA56004 from Philips. This device is + * pin-compatible with the LM86, the ED/EDP parts are also address-compatible. + * + * This driver also supports the G781 from GMT. This device is compatible + * with the ADM1032. + * + * This driver also supports TMP451 from Texas Instruments. This device is + * supported in both compatibility and extended mode. It's mostly compatible + * with ADT7461 except for local temperature low byte register and max + * conversion rate. + * + * 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.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/sysfs.h> +#include <linux/interrupt.h> +#include <linux/regulator/consumer.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, ADT7461A, MAX6649, + * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c. + * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D + * have address 0x4d. + * MAX6647 has address 0x4e. + * MAX6659 can have address 0x4c, 0x4d or 0x4e. + * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, + * 0x4c, 0x4d or 0x4e. + * SA56004 can have address 0x48 through 0x4F. + */ + +static const unsigned short normal_i2c[] = { + 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c, + 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; + +enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680, + max6646, w83l771, max6696, sa56004, g781, tmp451 }; + +/* + * 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 + +/* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */ + +#define MAX6657_REG_R_LOCAL_TEMPL 0x11 +#define MAX6696_REG_R_STATUS2 0x12 +#define MAX6659_REG_R_REMOTE_EMERG 0x16 +#define MAX6659_REG_W_REMOTE_EMERG 0x16 +#define MAX6659_REG_R_LOCAL_EMERG 0x17 +#define MAX6659_REG_W_LOCAL_EMERG 0x17 + +/* SA56004 registers */ + +#define SA56004_REG_R_LOCAL_TEMPL 0x22 + +#define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */ + +/* TMP451 registers */ +#define TMP451_REG_R_LOCAL_TEMPL 0x15 + +/* + * Device flags + */ +#define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */ +/* Device features */ +#define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */ +#define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */ +#define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */ +#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */ +#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */ +#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */ +#define LM90_PAUSE_FOR_CONFIG (1 << 8) /* Pause conversion for config */ + +/* LM90 status */ +#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */ +#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */ +#define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */ +#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */ +#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */ +#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */ +#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */ +#define LM90_STATUS_BUSY (1 << 7) /* conversion is ongoing */ + +#define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */ +#define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */ +#define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */ +#define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */ +#define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */ +#define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */ +#define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */ + +/* + * Driver data (common to all clients) + */ + +static const struct i2c_device_id lm90_id[] = { + { "adm1032", adm1032 }, + { "adt7461", adt7461 }, + { "adt7461a", adt7461 }, + { "g781", g781 }, + { "lm90", lm90 }, + { "lm86", lm86 }, + { "lm89", lm86 }, + { "lm99", lm99 }, + { "max6646", max6646 }, + { "max6647", max6646 }, + { "max6649", max6646 }, + { "max6657", max6657 }, + { "max6658", max6657 }, + { "max6659", max6659 }, + { "max6680", max6680 }, + { "max6681", max6680 }, + { "max6695", max6696 }, + { "max6696", max6696 }, + { "nct1008", adt7461 }, + { "w83l771", w83l771 }, + { "sa56004", sa56004 }, + { "tmp451", tmp451 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm90_id); + +static const struct of_device_id lm90_of_match[] = { + { + .compatible = "adi,adm1032", + .data = (void *)adm1032 + }, + { + .compatible = "adi,adt7461", + .data = (void *)adt7461 + }, + { + .compatible = "adi,adt7461a", + .data = (void *)adt7461 + }, + { + .compatible = "gmt,g781", + .data = (void *)g781 + }, + { + .compatible = "national,lm90", + .data = (void *)lm90 + }, + { + .compatible = "national,lm86", + .data = (void *)lm86 + }, + { + .compatible = "national,lm89", + .data = (void *)lm86 + }, + { + .compatible = "national,lm99", + .data = (void *)lm99 + }, + { + .compatible = "dallas,max6646", + .data = (void *)max6646 + }, + { + .compatible = "dallas,max6647", + .data = (void *)max6646 + }, + { + .compatible = "dallas,max6649", + .data = (void *)max6646 + }, + { + .compatible = "dallas,max6657", + .data = (void *)max6657 + }, + { + .compatible = "dallas,max6658", + .data = (void *)max6657 + }, + { + .compatible = "dallas,max6659", + .data = (void *)max6659 + }, + { + .compatible = "dallas,max6680", + .data = (void *)max6680 + }, + { + .compatible = "dallas,max6681", + .data = (void *)max6680 + }, + { + .compatible = "dallas,max6695", + .data = (void *)max6696 + }, + { + .compatible = "dallas,max6696", + .data = (void *)max6696 + }, + { + .compatible = "onnn,nct1008", + .data = (void *)adt7461 + }, + { + .compatible = "winbond,w83l771", + .data = (void *)w83l771 + }, + { + .compatible = "nxp,sa56004", + .data = (void *)sa56004 + }, + { + .compatible = "ti,tmp451", + .data = (void *)tmp451 + }, + { }, +}; +MODULE_DEVICE_TABLE(of, lm90_of_match); + +/* + * chip type specific parameters + */ +struct lm90_params { + u32 flags; /* Capabilities */ + u16 alert_alarms; /* Which alarm bits trigger ALERT# */ + /* Upper 8 bits for max6695/96 */ + u8 max_convrate; /* Maximum conversion rate register value */ + u8 reg_local_ext; /* Extended local temp register (optional) */ +}; + +static const struct lm90_params lm90_params[] = { + [adm1032] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT + | LM90_HAVE_BROKEN_ALERT, + .alert_alarms = 0x7c, + .max_convrate = 10, + }, + [adt7461] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT + | LM90_HAVE_BROKEN_ALERT, + .alert_alarms = 0x7c, + .max_convrate = 10, + }, + [g781] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT + | LM90_HAVE_BROKEN_ALERT, + .alert_alarms = 0x7c, + .max_convrate = 7, + }, + [lm86] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, + .alert_alarms = 0x7b, + .max_convrate = 9, + }, + [lm90] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, + .alert_alarms = 0x7b, + .max_convrate = 9, + }, + [lm99] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, + .alert_alarms = 0x7b, + .max_convrate = 9, + }, + [max6646] = { + .alert_alarms = 0x7c, + .max_convrate = 6, + .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, + }, + [max6657] = { + .flags = LM90_PAUSE_FOR_CONFIG, + .alert_alarms = 0x7c, + .max_convrate = 8, + .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, + }, + [max6659] = { + .flags = LM90_HAVE_EMERGENCY, + .alert_alarms = 0x7c, + .max_convrate = 8, + .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, + }, + [max6680] = { + .flags = LM90_HAVE_OFFSET, + .alert_alarms = 0x7c, + .max_convrate = 7, + }, + [max6696] = { + .flags = LM90_HAVE_EMERGENCY + | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3, + .alert_alarms = 0x1c7c, + .max_convrate = 6, + .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, + }, + [w83l771] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, + .alert_alarms = 0x7c, + .max_convrate = 8, + }, + [sa56004] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, + .alert_alarms = 0x7b, + .max_convrate = 9, + .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL, + }, + [tmp451] = { + .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT + | LM90_HAVE_BROKEN_ALERT, + .alert_alarms = 0x7c, + .max_convrate = 9, + .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL, + }, +}; + +/* + * TEMP8 register index + */ +enum lm90_temp8_reg_index { + LOCAL_LOW = 0, + LOCAL_HIGH, + LOCAL_CRIT, + REMOTE_CRIT, + LOCAL_EMERG, /* max6659 and max6695/96 */ + REMOTE_EMERG, /* max6659 and max6695/96 */ + REMOTE2_CRIT, /* max6695/96 only */ + REMOTE2_EMERG, /* max6695/96 only */ + TEMP8_REG_NUM +}; + +/* + * TEMP11 register index + */ +enum lm90_temp11_reg_index { + REMOTE_TEMP = 0, + REMOTE_LOW, + REMOTE_HIGH, + REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */ + LOCAL_TEMP, + REMOTE2_TEMP, /* max6695/96 only */ + REMOTE2_LOW, /* max6695/96 only */ + REMOTE2_HIGH, /* max6695/96 only */ + TEMP11_REG_NUM +}; + +/* + * Client data (each client gets its own) + */ + +struct lm90_data { + struct i2c_client *client; + u32 channel_config[4]; + struct hwmon_channel_info temp_info; + const struct hwmon_channel_info *info[3]; + struct hwmon_chip_info chip; + struct mutex update_lock; + bool valid; /* true if register values are valid */ + unsigned long last_updated; /* in jiffies */ + int kind; + u32 flags; + + unsigned int update_interval; /* in milliseconds */ + + u8 config_orig; /* Original configuration register value */ + u8 convrate_orig; /* Original conversion rate register value */ + u16 alert_alarms; /* Which alarm bits trigger ALERT# */ + /* Upper 8 bits for max6695/96 */ + u8 max_convrate; /* Maximum conversion rate */ + u8 reg_local_ext; /* local extension register offset */ + + /* registers values */ + s8 temp8[TEMP8_REG_NUM]; + s16 temp11[TEMP11_REG_NUM]; + u8 temp_hyst; + u16 alarms; /* bitvector (upper 8 bits for max6695/96) */ +}; + +/* + * Support functions + */ + +/* + * 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) +{ + 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); + + return err; +} + +static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl) +{ + int 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 + * between 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. + */ + oldh = lm90_read_reg(client, regh); + if (oldh < 0) + return oldh; + l = lm90_read_reg(client, regl); + if (l < 0) + return l; + newh = lm90_read_reg(client, regh); + if (newh < 0) + return newh; + if (oldh != newh) { + l = lm90_read_reg(client, regl); + if (l < 0) + return l; + } + return (newh << 8) | l; +} + +/* + * client->update_lock must be held when calling this function (unless we are + * in detection or initialization steps), and while a remote channel other + * than channel 0 is selected. Also, calling code must make sure to re-select + * external channel 0 before releasing the lock. This is necessary because + * various registers have different meanings as a result of selecting a + * non-default remote channel. + */ +static inline int lm90_select_remote_channel(struct i2c_client *client, + struct lm90_data *data, + int channel) +{ + int config; + + if (data->kind == max6696) { + config = lm90_read_reg(client, LM90_REG_R_CONFIG1); + if (config < 0) + return config; + config &= ~0x08; + if (channel) + config |= 0x08; + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + config); + } + return 0; +} + +static int lm90_write_convrate(struct i2c_client *client, + struct lm90_data *data, int val) +{ + int err; + int config_orig, config_stop; + + /* Save config and pause conversion */ + if (data->flags & LM90_PAUSE_FOR_CONFIG) { + config_orig = lm90_read_reg(client, LM90_REG_R_CONFIG1); + if (config_orig < 0) + return config_orig; + config_stop = config_orig | 0x40; + if (config_orig != config_stop) { + err = i2c_smbus_write_byte_data(client, + LM90_REG_W_CONFIG1, + config_stop); + if (err < 0) + return err; + } + } + + /* Set conv rate */ + err = i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, val); + + /* Revert change to config */ + if (data->flags & LM90_PAUSE_FOR_CONFIG && config_orig != config_stop) + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + config_orig); + + return err; +} + +/* + * Set conversion rate. + * client->update_lock must be held when calling this function (unless we are + * in detection or initialization steps). + */ +static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data, + unsigned int interval) +{ + unsigned int update_interval; + int i, err; + + /* Shift calculations to avoid rounding errors */ + interval <<= 6; + + /* find the nearest update rate */ + for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6; + i < data->max_convrate; i++, update_interval >>= 1) + if (interval >= update_interval * 3 / 4) + break; + + err = lm90_write_convrate(client, data, i); + data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64); + return err; +} + +static int lm90_update_limits(struct device *dev) +{ + struct lm90_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int val; + + val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT); + if (val < 0) + return val; + data->temp8[LOCAL_CRIT] = val; + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); + if (val < 0) + return val; + data->temp8[REMOTE_CRIT] = val; + + val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST); + if (val < 0) + return val; + data->temp_hyst = val; + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); + if (val < 0) + return val; + data->temp11[REMOTE_LOW] = val << 8; + + if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { + val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL); + if (val < 0) + return val; + data->temp11[REMOTE_LOW] |= val; + } + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); + if (val < 0) + return val; + data->temp11[REMOTE_HIGH] = val << 8; + + if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { + val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL); + if (val < 0) + return val; + data->temp11[REMOTE_HIGH] |= val; + } + + if (data->flags & LM90_HAVE_OFFSET) { + val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH, + LM90_REG_R_REMOTE_OFFSL); + if (val < 0) + return val; + data->temp11[REMOTE_OFFSET] = val; + } + + if (data->flags & LM90_HAVE_EMERGENCY) { + val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG); + if (val < 0) + return val; + data->temp8[LOCAL_EMERG] = val; + + val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); + if (val < 0) + return val; + data->temp8[REMOTE_EMERG] = val; + } + + if (data->kind == max6696) { + val = lm90_select_remote_channel(client, data, 1); + if (val < 0) + return val; + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); + if (val < 0) + return val; + data->temp8[REMOTE2_CRIT] = val; + + val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); + if (val < 0) + return val; + data->temp8[REMOTE2_EMERG] = val; + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); + if (val < 0) + return val; + data->temp11[REMOTE2_LOW] = val << 8; + + val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); + if (val < 0) + return val; + data->temp11[REMOTE2_HIGH] = val << 8; + + lm90_select_remote_channel(client, data, 0); + } + + return 0; +} + +static int lm90_update_device(struct device *dev) +{ + struct lm90_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + unsigned long next_update; + int val; + + if (!data->valid) { + val = lm90_update_limits(dev); + if (val < 0) + return val; + } + + next_update = data->last_updated + + msecs_to_jiffies(data->update_interval); + if (time_after(jiffies, next_update) || !data->valid) { + dev_dbg(&client->dev, "Updating lm90 data.\n"); + + data->valid = false; + + val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW); + if (val < 0) + return val; + data->temp8[LOCAL_LOW] = val; + + val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH); + if (val < 0) + return val; + data->temp8[LOCAL_HIGH] = val; + + if (data->reg_local_ext) { + val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP, + data->reg_local_ext); + if (val < 0) + return val; + data->temp11[LOCAL_TEMP] = val; + } else { + val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP); + if (val < 0) + return val; + data->temp11[LOCAL_TEMP] = val << 8; + } + val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, + LM90_REG_R_REMOTE_TEMPL); + if (val < 0) + return val; + data->temp11[REMOTE_TEMP] = val; + + val = lm90_read_reg(client, LM90_REG_R_STATUS); + if (val < 0) + return val; + data->alarms = val & ~LM90_STATUS_BUSY; + + if (data->kind == max6696) { + val = lm90_select_remote_channel(client, data, 1); + if (val < 0) + return val; + + val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, + LM90_REG_R_REMOTE_TEMPL); + if (val < 0) { + lm90_select_remote_channel(client, data, 0); + return val; + } + data->temp11[REMOTE2_TEMP] = val; + + lm90_select_remote_channel(client, data, 0); + + val = lm90_read_reg(client, MAX6696_REG_R_STATUS2); + if (val < 0) + return val; + data->alarms |= val << 8; + } + + /* + * Re-enable ALERT# output if it was originally enabled and + * relevant alarms are all clear + */ + if (!(data->config_orig & 0x80) && + !(data->alarms & data->alert_alarms)) { + val = lm90_read_reg(client, LM90_REG_R_CONFIG1); + if (val < 0) + return val; + + if (val & 0x80) { + dev_dbg(&client->dev, "Re-enabling ALERT#\n"); + i2c_smbus_write_byte_data(client, + LM90_REG_W_CONFIG1, + val & ~0x80); + } + } + + data->last_updated = jiffies; + data->valid = true; + } + + return 0; +} + +/* + * 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; + 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; + 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; + } + 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; + } + if (val <= 0) + return 0; + if (val >= 127750) + return 0x7FC0; + return (val + 125) / 250 * 64; +} + +/* pec used for ADM1032 only */ +static ssize_t pec_show(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 pec_store(struct device *dev, struct device_attribute *dummy, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err < 0) + return err; + + 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_RW(pec); + +static int lm90_get_temp11(struct lm90_data *data, int index) +{ + s16 temp11 = data->temp11[index]; + int temp; + + if (data->kind == adt7461 || data->kind == tmp451) + temp = temp_from_u16_adt7461(data, temp11); + else if (data->kind == max6646) + temp = temp_from_u16(temp11); + else + temp = temp_from_s16(temp11); + + /* +16 degrees offset for temp2 for the LM99 */ + if (data->kind == lm99 && index <= 2) + temp += 16000; + + return temp; +} + +static int lm90_set_temp11(struct lm90_data *data, int index, long val) +{ + static struct reg { + u8 high; + u8 low; + } reg[] = { + [REMOTE_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, + [REMOTE_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL }, + [REMOTE_OFFSET] = { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL }, + [REMOTE2_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, + [REMOTE2_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL } + }; + struct i2c_client *client = data->client; + struct reg *regp = ®[index]; + int err; + + /* +16 degrees offset for temp2 for the LM99 */ + if (data->kind == lm99 && index <= 2) + val -= 16000; + + if (data->kind == adt7461 || data->kind == tmp451) + data->temp11[index] = temp_to_u16_adt7461(data, val); + else if (data->kind == max6646) + data->temp11[index] = temp_to_u8(val) << 8; + else if (data->flags & LM90_HAVE_REM_LIMIT_EXT) + data->temp11[index] = temp_to_s16(val); + else + data->temp11[index] = temp_to_s8(val) << 8; + + lm90_select_remote_channel(client, data, index >= 3); + err = i2c_smbus_write_byte_data(client, regp->high, + data->temp11[index] >> 8); + if (err < 0) + return err; + if (data->flags & LM90_HAVE_REM_LIMIT_EXT) + err = i2c_smbus_write_byte_data(client, regp->low, + data->temp11[index] & 0xff); + + lm90_select_remote_channel(client, data, 0); + return err; +} + +static int lm90_get_temp8(struct lm90_data *data, int index) +{ + s8 temp8 = data->temp8[index]; + int temp; + + if (data->kind == adt7461 || data->kind == tmp451) + temp = temp_from_u8_adt7461(data, temp8); + else if (data->kind == max6646) + temp = temp_from_u8(temp8); + else + temp = temp_from_s8(temp8); + + /* +16 degrees offset for temp2 for the LM99 */ + if (data->kind == lm99 && index == 3) + temp += 16000; + + return temp; +} + +static int lm90_set_temp8(struct lm90_data *data, int index, long val) +{ + static const u8 reg[TEMP8_REG_NUM] = { + LM90_REG_W_LOCAL_LOW, + LM90_REG_W_LOCAL_HIGH, + LM90_REG_W_LOCAL_CRIT, + LM90_REG_W_REMOTE_CRIT, + MAX6659_REG_W_LOCAL_EMERG, + MAX6659_REG_W_REMOTE_EMERG, + LM90_REG_W_REMOTE_CRIT, + MAX6659_REG_W_REMOTE_EMERG, + }; + struct i2c_client *client = data->client; + int err; + + /* +16 degrees offset for temp2 for the LM99 */ + if (data->kind == lm99 && index == 3) + val -= 16000; + + if (data->kind == adt7461 || data->kind == tmp451) + data->temp8[index] = temp_to_u8_adt7461(data, val); + else if (data->kind == max6646) + data->temp8[index] = temp_to_u8(val); + else + data->temp8[index] = temp_to_s8(val); + + lm90_select_remote_channel(client, data, index >= 6); + err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]); + lm90_select_remote_channel(client, data, 0); + + return err; +} + +static int lm90_get_temphyst(struct lm90_data *data, int index) +{ + int temp; + + if (data->kind == adt7461 || data->kind == tmp451) + temp = temp_from_u8_adt7461(data, data->temp8[index]); + else if (data->kind == max6646) + temp = temp_from_u8(data->temp8[index]); + else + temp = temp_from_s8(data->temp8[index]); + + /* +16 degrees offset for temp2 for the LM99 */ + if (data->kind == lm99 && index == 3) + temp += 16000; + + return temp - temp_from_s8(data->temp_hyst); +} + +static int lm90_set_temphyst(struct lm90_data *data, long val) +{ + struct i2c_client *client = data->client; + int temp; + int err; + + if (data->kind == adt7461 || data->kind == tmp451) + temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]); + else if (data->kind == max6646) + temp = temp_from_u8(data->temp8[LOCAL_CRIT]); + else + temp = temp_from_s8(data->temp8[LOCAL_CRIT]); + + data->temp_hyst = hyst_to_reg(temp - val); + err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, + data->temp_hyst); + return err; +} + +static const u8 lm90_temp_index[3] = { + LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP +}; + +static const u8 lm90_temp_min_index[3] = { + LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW +}; + +static const u8 lm90_temp_max_index[3] = { + LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH +}; + +static const u8 lm90_temp_crit_index[3] = { + LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT +}; + +static const u8 lm90_temp_emerg_index[3] = { + LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG +}; + +static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 }; +static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 }; +static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 }; +static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 }; +static const u8 lm90_fault_bits[3] = { 0, 2, 10 }; + +static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val) +{ + struct lm90_data *data = dev_get_drvdata(dev); + int err; + + mutex_lock(&data->update_lock); + err = lm90_update_device(dev); + mutex_unlock(&data->update_lock); + if (err) + return err; + + switch (attr) { + case hwmon_temp_input: + *val = lm90_get_temp11(data, lm90_temp_index[channel]); + break; + case hwmon_temp_min_alarm: + *val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1; + break; + case hwmon_temp_max_alarm: + *val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1; + break; + case hwmon_temp_crit_alarm: + *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1; + break; + case hwmon_temp_emergency_alarm: + *val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1; + break; + case hwmon_temp_fault: + *val = (data->alarms >> lm90_fault_bits[channel]) & 1; + break; + case hwmon_temp_min: + if (channel == 0) + *val = lm90_get_temp8(data, + lm90_temp_min_index[channel]); + else + *val = lm90_get_temp11(data, + lm90_temp_min_index[channel]); + break; + case hwmon_temp_max: + if (channel == 0) + *val = lm90_get_temp8(data, + lm90_temp_max_index[channel]); + else + *val = lm90_get_temp11(data, + lm90_temp_max_index[channel]); + break; + case hwmon_temp_crit: + *val = lm90_get_temp8(data, lm90_temp_crit_index[channel]); + break; + case hwmon_temp_crit_hyst: + *val = lm90_get_temphyst(data, lm90_temp_crit_index[channel]); + break; + case hwmon_temp_emergency: + *val = lm90_get_temp8(data, lm90_temp_emerg_index[channel]); + break; + case hwmon_temp_emergency_hyst: + *val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel]); + break; + case hwmon_temp_offset: + *val = lm90_get_temp11(data, REMOTE_OFFSET); + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val) +{ + struct lm90_data *data = dev_get_drvdata(dev); + int err; + + mutex_lock(&data->update_lock); + + err = lm90_update_device(dev); + if (err) + goto error; + + switch (attr) { + case hwmon_temp_min: + if (channel == 0) + err = lm90_set_temp8(data, + lm90_temp_min_index[channel], + val); + else + err = lm90_set_temp11(data, + lm90_temp_min_index[channel], + val); + break; + case hwmon_temp_max: + if (channel == 0) + err = lm90_set_temp8(data, + lm90_temp_max_index[channel], + val); + else + err = lm90_set_temp11(data, + lm90_temp_max_index[channel], + val); + break; + case hwmon_temp_crit: + err = lm90_set_temp8(data, lm90_temp_crit_index[channel], val); + break; + case hwmon_temp_crit_hyst: + err = lm90_set_temphyst(data, val); + break; + case hwmon_temp_emergency: + err = lm90_set_temp8(data, lm90_temp_emerg_index[channel], val); + break; + case hwmon_temp_offset: + err = lm90_set_temp11(data, REMOTE_OFFSET, val); + break; + default: + err = -EOPNOTSUPP; + break; + } +error: + mutex_unlock(&data->update_lock); + + return err; +} + +static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel) +{ + switch (attr) { + case hwmon_temp_input: + case hwmon_temp_min_alarm: + case hwmon_temp_max_alarm: + case hwmon_temp_crit_alarm: + case hwmon_temp_emergency_alarm: + case hwmon_temp_emergency_hyst: + case hwmon_temp_fault: + return S_IRUGO; + case hwmon_temp_min: + case hwmon_temp_max: + case hwmon_temp_crit: + case hwmon_temp_emergency: + case hwmon_temp_offset: + return S_IRUGO | S_IWUSR; + case hwmon_temp_crit_hyst: + if (channel == 0) + return S_IRUGO | S_IWUSR; + return S_IRUGO; + default: + return 0; + } +} + +static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val) +{ + struct lm90_data *data = dev_get_drvdata(dev); + int err; + + mutex_lock(&data->update_lock); + err = lm90_update_device(dev); + mutex_unlock(&data->update_lock); + if (err) + return err; + + switch (attr) { + case hwmon_chip_update_interval: + *val = data->update_interval; + break; + case hwmon_chip_alarms: + *val = data->alarms; + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val) +{ + struct lm90_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int err; + + mutex_lock(&data->update_lock); + + err = lm90_update_device(dev); + if (err) + goto error; + + switch (attr) { + case hwmon_chip_update_interval: + err = lm90_set_convrate(client, data, + clamp_val(val, 0, 100000)); + break; + default: + err = -EOPNOTSUPP; + break; + } +error: + mutex_unlock(&data->update_lock); + + return err; +} + +static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel) +{ + switch (attr) { + case hwmon_chip_update_interval: + return S_IRUGO | S_IWUSR; + case hwmon_chip_alarms: + return S_IRUGO; + default: + return 0; + } +} + +static int lm90_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + switch (type) { + case hwmon_chip: + return lm90_chip_read(dev, attr, channel, val); + case hwmon_temp: + return lm90_temp_read(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int lm90_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + switch (type) { + case hwmon_chip: + return lm90_chip_write(dev, attr, channel, val); + case hwmon_temp: + return lm90_temp_write(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_chip: + return lm90_chip_is_visible(data, attr, channel); + case hwmon_temp: + return lm90_temp_is_visible(data, attr, channel); + default: + return 0; + } +} + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int lm90_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + int address = client->addr; + const char *name = NULL; + int man_id, chip_id, config1, config2, convrate; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* detection and identification */ + man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID); + chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID); + config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); + convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE); + if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0) + return -ENODEV; + + if (man_id == 0x01 || man_id == 0x5C || man_id == 0xA1) { + config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2); + if (config2 < 0) + return -ENODEV; + } + + if ((address == 0x4C || address == 0x4D) + && man_id == 0x01) { /* National Semiconductor */ + if ((config1 & 0x2A) == 0x00 + && (config2 & 0xF8) == 0x00 + && 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 */ + && (config1 & 0x3F) == 0x00 + && 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 */ + && (config1 & 0x1B) == 0x00 + && convrate <= 0x0A) { + name = "adt7461"; + } else + if (chip_id == 0x57 /* ADT7461A, NCT1008 */ + && (config1 & 0x1B) == 0x00 + && convrate <= 0x0A) { + name = "adt7461a"; + } + } else + if (man_id == 0x4D) { /* Maxim */ + int emerg, emerg2, status2; + + /* + * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read + * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG + * exists, both readings will reflect the same value. Otherwise, + * the readings will be different. + */ + emerg = i2c_smbus_read_byte_data(client, + MAX6659_REG_R_REMOTE_EMERG); + man_id = i2c_smbus_read_byte_data(client, + LM90_REG_R_MAN_ID); + emerg2 = i2c_smbus_read_byte_data(client, + MAX6659_REG_R_REMOTE_EMERG); + status2 = i2c_smbus_read_byte_data(client, + MAX6696_REG_R_STATUS2); + if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0) + return -ENODEV; + + /* + * 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. + * MAX6659 has a third set of upper temperature limit registers. + * Those registers also return values on MAX6657 and MAX6658, + * thus the only way to detect MAX6659 is by its address. + * For this reason it will be mis-detected as MAX6657 if its + * address is 0x4C. + */ + if (chip_id == man_id + && (address == 0x4C || address == 0x4D || address == 0x4E) + && (config1 & 0x1F) == (man_id & 0x0F) + && convrate <= 0x09) { + if (address == 0x4C) + name = "max6657"; + else + name = "max6659"; + } else + /* + * Even though MAX6695 and MAX6696 do not have a chip ID + * register, reading it returns 0x01. Bit 4 of the config1 + * register is unused and should return zero when read. Bit 0 of + * the status2 register is unused and should return zero when + * read. + * + * MAX6695 and MAX6696 have an additional set of temperature + * limit registers. We can detect those chips by checking if + * one of those registers exists. + */ + if (chip_id == 0x01 + && (config1 & 0x10) == 0x00 + && (status2 & 0x01) == 0x00 + && emerg == emerg2 + && convrate <= 0x07) { + name = "max6696"; + } 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 + && (config1 & 0x03) == 0x00 + && 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 + && (config1 & 0x3f) == 0x00 + && convrate <= 0x07) { + name = "max6646"; + } + } else + if (address == 0x4C + && man_id == 0x5C) { /* Winbond/Nuvoton */ + if ((config1 & 0x2A) == 0x00 + && (config2 & 0xF8) == 0x00) { + if (chip_id == 0x01 /* W83L771W/G */ + && convrate <= 0x09) { + name = "w83l771"; + } else + if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ + && convrate <= 0x08) { + name = "w83l771"; + } + } + } else + if (address >= 0x48 && address <= 0x4F + && man_id == 0xA1) { /* NXP Semiconductor/Philips */ + if (chip_id == 0x00 + && (config1 & 0x2A) == 0x00 + && (config2 & 0xFE) == 0x00 + && convrate <= 0x09) { + name = "sa56004"; + } + } else + if ((address == 0x4C || address == 0x4D) + && man_id == 0x47) { /* GMT */ + if (chip_id == 0x01 /* G781 */ + && (config1 & 0x3F) == 0x00 + && convrate <= 0x08) + name = "g781"; + } else + if (address == 0x4C + && man_id == 0x55) { /* Texas Instruments */ + int local_ext; + + local_ext = i2c_smbus_read_byte_data(client, + TMP451_REG_R_LOCAL_TEMPL); + + if (chip_id == 0x00 /* TMP451 */ + && (config1 & 0x1B) == 0x00 + && convrate <= 0x09 + && (local_ext & 0x0F) == 0x00) + name = "tmp451"; + } + + 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 void lm90_restore_conf(void *_data) +{ + struct lm90_data *data = _data; + struct i2c_client *client = data->client; + + /* Restore initial configuration */ + lm90_write_convrate(client, data, data->convrate_orig); + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + data->config_orig); +} + +static int lm90_init_client(struct i2c_client *client, struct lm90_data *data) +{ + int config, convrate; + + convrate = lm90_read_reg(client, LM90_REG_R_CONVRATE); + if (convrate < 0) + return convrate; + data->convrate_orig = convrate; + + /* + * Start the conversions. + */ + config = lm90_read_reg(client, LM90_REG_R_CONFIG1); + if (config < 0) + return config; + data->config_orig = config; + + lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */ + + /* Check Temperature Range Select */ + if (data->kind == adt7461 || data->kind == tmp451) { + 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; + + /* + * Select external channel 0 for max6695/96 + */ + if (data->kind == max6696) + config &= ~0x08; + + config &= 0xBF; /* run */ + if (config != data->config_orig) /* Only write if changed */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); + + return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data); +} + +static bool lm90_is_tripped(struct i2c_client *client, u16 *status) +{ + struct lm90_data *data = i2c_get_clientdata(client); + int st, st2 = 0; + + st = lm90_read_reg(client, LM90_REG_R_STATUS); + if (st < 0) + return false; + + if (data->kind == max6696) { + st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2); + if (st2 < 0) + return false; + } + + *status = st | (st2 << 8); + + if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0) + return false; + + if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || + (st2 & MAX6696_STATUS2_LOT2)) + dev_warn(&client->dev, + "temp%d out of range, please check!\n", 1); + if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || + (st2 & MAX6696_STATUS2_ROT2)) + dev_warn(&client->dev, + "temp%d out of range, please check!\n", 2); + if (st & LM90_STATUS_ROPEN) + dev_warn(&client->dev, + "temp%d diode open, please check!\n", 2); + if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | + MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) + dev_warn(&client->dev, + "temp%d out of range, please check!\n", 3); + if (st2 & MAX6696_STATUS2_R2OPEN) + dev_warn(&client->dev, + "temp%d diode open, please check!\n", 3); + + return true; +} + +static irqreturn_t lm90_irq_thread(int irq, void *dev_id) +{ + struct i2c_client *client = dev_id; + u16 status; + + if (lm90_is_tripped(client, &status)) + return IRQ_HANDLED; + else + return IRQ_NONE; +} + +static void lm90_remove_pec(void *dev) +{ + device_remove_file(dev, &dev_attr_pec); +} + +static void lm90_regulator_disable(void *regulator) +{ + regulator_disable(regulator); +} + +static const u32 lm90_chip_config[] = { + HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL | HWMON_C_ALARMS, + 0 +}; + +static const struct hwmon_channel_info lm90_chip_info = { + .type = hwmon_chip, + .config = lm90_chip_config, +}; + + +static const struct hwmon_ops lm90_ops = { + .is_visible = lm90_is_visible, + .read = lm90_read, + .write = lm90_write, +}; + +static int lm90_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct i2c_adapter *adapter = to_i2c_adapter(dev->parent); + struct hwmon_channel_info *info; + struct regulator *regulator; + struct device *hwmon_dev; + struct lm90_data *data; + int err; + + regulator = devm_regulator_get(dev, "vcc"); + if (IS_ERR(regulator)) + return PTR_ERR(regulator); + + err = regulator_enable(regulator); + if (err < 0) { + dev_err(dev, "Failed to enable regulator: %d\n", err); + return err; + } + + err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator); + if (err) + return err; + + data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Set the device type */ + if (client->dev.of_node) + data->kind = (enum chips)of_device_get_match_data(&client->dev); + else + data->kind = id->driver_data; + if (data->kind == adm1032) { + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) + client->flags &= ~I2C_CLIENT_PEC; + } + + /* + * Different devices have different alarm bits triggering the + * ALERT# output + */ + data->alert_alarms = lm90_params[data->kind].alert_alarms; + + /* Set chip capabilities */ + data->flags = lm90_params[data->kind].flags; + + data->chip.ops = &lm90_ops; + data->chip.info = data->info; + + data->info[0] = &lm90_chip_info; + data->info[1] = &data->temp_info; + + info = &data->temp_info; + info->type = hwmon_temp; + info->config = data->channel_config; + + data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | + HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | + HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM; + data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | + HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | + HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT; + + if (data->flags & LM90_HAVE_OFFSET) + data->channel_config[1] |= HWMON_T_OFFSET; + + if (data->flags & LM90_HAVE_EMERGENCY) { + data->channel_config[0] |= HWMON_T_EMERGENCY | + HWMON_T_EMERGENCY_HYST; + data->channel_config[1] |= HWMON_T_EMERGENCY | + HWMON_T_EMERGENCY_HYST; + } + + if (data->flags & LM90_HAVE_EMERGENCY_ALARM) { + data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM; + data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM; + } + + if (data->flags & LM90_HAVE_TEMP3) { + data->channel_config[2] = HWMON_T_INPUT | + HWMON_T_MIN | HWMON_T_MAX | + HWMON_T_CRIT | HWMON_T_CRIT_HYST | + HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST | + HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | + HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM | + HWMON_T_FAULT; + } + + data->reg_local_ext = lm90_params[data->kind].reg_local_ext; + + /* Set maximum conversion rate */ + data->max_convrate = lm90_params[data->kind].max_convrate; + + /* Initialize the LM90 chip */ + err = lm90_init_client(client, data); + if (err < 0) { + dev_err(dev, "Failed to initialize device\n"); + return err; + } + + /* + * The 'pec' attribute is attached to the i2c device and thus created + * separately. + */ + if (client->flags & I2C_CLIENT_PEC) { + err = device_create_file(dev, &dev_attr_pec); + if (err) + return err; + err = devm_add_action_or_reset(dev, lm90_remove_pec, dev); + if (err) + return err; + } + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, + data, &data->chip, + NULL); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + if (client->irq) { + dev_dbg(dev, "IRQ: %d\n", client->irq); + err = devm_request_threaded_irq(dev, client->irq, + NULL, lm90_irq_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "lm90", client); + if (err < 0) { + dev_err(dev, "cannot request IRQ %d\n", client->irq); + return err; + } + } + + return 0; +} + +static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type, + unsigned int flag) +{ + u16 alarms; + + if (type != I2C_PROTOCOL_SMBUS_ALERT) + return; + + if (lm90_is_tripped(client, &alarms)) { + /* + * Disable ALERT# output, because these chips don't implement + * SMBus alert correctly; they should only hold the alert line + * low briefly. + */ + struct lm90_data *data = i2c_get_clientdata(client); + + if ((data->flags & LM90_HAVE_BROKEN_ALERT) && + (alarms & data->alert_alarms)) { + int config; + + dev_dbg(&client->dev, "Disabling ALERT#\n"); + config = lm90_read_reg(client, LM90_REG_R_CONFIG1); + if (config >= 0) + i2c_smbus_write_byte_data(client, + LM90_REG_W_CONFIG1, + config | 0x80); + } + } else { + dev_info(&client->dev, "Everything OK\n"); + } +} + +static struct i2c_driver lm90_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm90", + .of_match_table = of_match_ptr(lm90_of_match), + }, + .probe = lm90_probe, + .alert = lm90_alert, + .id_table = lm90_id, + .detect = lm90_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(lm90_driver); + +MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); +MODULE_DESCRIPTION("LM90/ADM1032 driver"); +MODULE_LICENSE("GPL"); |