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Diffstat (limited to '')
| -rw-r--r-- | drivers/hwmon/adt7470.c | 1328 |
1 files changed, 1328 insertions, 0 deletions
diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c new file mode 100644 index 000000000..927f8df05 --- /dev/null +++ b/drivers/hwmon/adt7470.c @@ -0,0 +1,1328 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * A hwmon driver for the Analog Devices ADT7470 + * Copyright (C) 2007 IBM + * + * Author: Darrick J. Wong <darrick.wong@oracle.com> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include <linux/kthread.h> +#include <linux/regmap.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/util_macros.h> + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END }; + +/* ADT7470 registers */ +#define ADT7470_REG_BASE_ADDR 0x20 +#define ADT7470_REG_TEMP_BASE_ADDR 0x20 +#define ADT7470_REG_TEMP_MAX_ADDR 0x29 +#define ADT7470_REG_FAN_BASE_ADDR 0x2A +#define ADT7470_REG_FAN_MAX_ADDR 0x31 +#define ADT7470_REG_PWM_BASE_ADDR 0x32 +#define ADT7470_REG_PWM_MAX_ADDR 0x35 +#define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38 +#define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B +#define ADT7470_REG_CFG 0x40 +#define ADT7470_STRT_MASK 0x01 +#define ADT7470_TEST_MASK 0x02 +#define ADT7470_FSPD_MASK 0x04 +#define ADT7470_T05_STB_MASK 0x80 +#define ADT7470_REG_ALARM1 0x41 +#define ADT7470_R1T_ALARM 0x01 +#define ADT7470_R2T_ALARM 0x02 +#define ADT7470_R3T_ALARM 0x04 +#define ADT7470_R4T_ALARM 0x08 +#define ADT7470_R5T_ALARM 0x10 +#define ADT7470_R6T_ALARM 0x20 +#define ADT7470_R7T_ALARM 0x40 +#define ADT7470_OOL_ALARM 0x80 +#define ADT7470_REG_ALARM2 0x42 +#define ADT7470_R8T_ALARM 0x01 +#define ADT7470_R9T_ALARM 0x02 +#define ADT7470_R10T_ALARM 0x04 +#define ADT7470_FAN1_ALARM 0x10 +#define ADT7470_FAN2_ALARM 0x20 +#define ADT7470_FAN3_ALARM 0x40 +#define ADT7470_FAN4_ALARM 0x80 +#define ADT7470_REG_TEMP_LIMITS_BASE_ADDR 0x44 +#define ADT7470_REG_TEMP_LIMITS_MAX_ADDR 0x57 +#define ADT7470_REG_FAN_MIN_BASE_ADDR 0x58 +#define ADT7470_REG_FAN_MIN_MAX_ADDR 0x5F +#define ADT7470_REG_FAN_MAX_BASE_ADDR 0x60 +#define ADT7470_REG_FAN_MAX_MAX_ADDR 0x67 +#define ADT7470_REG_PWM_CFG_BASE_ADDR 0x68 +#define ADT7470_REG_PWM12_CFG 0x68 +#define ADT7470_PWM2_AUTO_MASK 0x40 +#define ADT7470_PWM1_AUTO_MASK 0x80 +#define ADT7470_PWM_AUTO_MASK 0xC0 +#define ADT7470_REG_PWM34_CFG 0x69 +#define ADT7470_PWM3_AUTO_MASK 0x40 +#define ADT7470_PWM4_AUTO_MASK 0x80 +#define ADT7470_REG_PWM_MIN_BASE_ADDR 0x6A +#define ADT7470_REG_PWM_MIN_MAX_ADDR 0x6D +#define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR 0x6E +#define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR 0x71 +#define ADT7470_REG_CFG_2 0x74 +#define ADT7470_REG_ACOUSTICS12 0x75 +#define ADT7470_REG_ACOUSTICS34 0x76 +#define ADT7470_REG_DEVICE 0x3D +#define ADT7470_REG_VENDOR 0x3E +#define ADT7470_REG_REVISION 0x3F +#define ADT7470_REG_ALARM1_MASK 0x72 +#define ADT7470_REG_ALARM2_MASK 0x73 +#define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C +#define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR 0x7D +#define ADT7470_REG_MAX_ADDR 0x81 + +#define ADT7470_TEMP_COUNT 10 +#define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x)) +#define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2)) +#define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \ + ((x) * 2) + 1) + +#define ADT7470_FAN_COUNT 4 +#define ADT7470_REG_FAN(x) (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2)) +#define ADT7470_REG_FAN_MIN(x) (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2)) +#define ADT7470_REG_FAN_MAX(x) (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2)) + +#define ADT7470_PWM_COUNT 4 +#define ADT7470_REG_PWM(x) (ADT7470_REG_PWM_BASE_ADDR + (x)) +#define ADT7470_REG_PWM_MAX(x) (ADT7470_REG_PWM_MAX_BASE_ADDR + (x)) +#define ADT7470_REG_PWM_MIN(x) (ADT7470_REG_PWM_MIN_BASE_ADDR + (x)) +#define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x)) +#define ADT7470_REG_PWM_CFG(x) (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2)) +#define ADT7470_REG_PWM_AUTO_TEMP(x) (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \ + ((x) / 2)) + +#define ALARM2(x) ((x) << 8) + +#define ADT7470_VENDOR 0x41 +#define ADT7470_DEVICE 0x70 +/* datasheet only mentions a revision 2 */ +#define ADT7470_REVISION 0x02 + +/* "all temps" according to hwmon sysfs interface spec */ +#define ADT7470_PWM_ALL_TEMPS 0x3FF + +/* How often do we reread sensors values? (In jiffies) */ +#define SENSOR_REFRESH_INTERVAL (5 * HZ) + +/* How often do we reread sensor limit values? (In jiffies) */ +#define LIMIT_REFRESH_INTERVAL (60 * HZ) + +/* Wait at least 200ms per sensor for 10 sensors */ +#define TEMP_COLLECTION_TIME 2000 + +/* auto update thing won't fire more than every 2s */ +#define AUTO_UPDATE_INTERVAL 2000 + +/* datasheet says to divide this number by the fan reading to get fan rpm */ +#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) +#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM +#define FAN_PERIOD_INVALID 65535 +#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) + +/* Config registers 1 and 2 include fields for selecting the PWM frequency */ +#define ADT7470_CFG_LF 0x40 +#define ADT7470_FREQ_MASK 0x70 +#define ADT7470_FREQ_SHIFT 4 + +struct adt7470_data { + struct regmap *regmap; + struct mutex lock; + char sensors_valid; + char limits_valid; + unsigned long sensors_last_updated; /* In jiffies */ + unsigned long limits_last_updated; /* In jiffies */ + + int num_temp_sensors; /* -1 = probe */ + int temperatures_probed; + + s8 temp[ADT7470_TEMP_COUNT]; + s8 temp_min[ADT7470_TEMP_COUNT]; + s8 temp_max[ADT7470_TEMP_COUNT]; + u16 fan[ADT7470_FAN_COUNT]; + u16 fan_min[ADT7470_FAN_COUNT]; + u16 fan_max[ADT7470_FAN_COUNT]; + u16 alarm; + u16 alarms_mask; + u8 force_pwm_max; + u8 pwm[ADT7470_PWM_COUNT]; + u8 pwm_max[ADT7470_PWM_COUNT]; + u8 pwm_automatic[ADT7470_PWM_COUNT]; + u8 pwm_min[ADT7470_PWM_COUNT]; + s8 pwm_tmin[ADT7470_PWM_COUNT]; + u8 pwm_auto_temp[ADT7470_PWM_COUNT]; + + struct task_struct *auto_update; + unsigned int auto_update_interval; +}; + +/* + * 16-bit registers on the ADT7470 are low-byte first. The data sheet says + * that the low byte must be read before the high byte. + */ +static inline int adt7470_read_word_data(struct adt7470_data *data, unsigned int reg, + unsigned int *val) +{ + u8 regval[2]; + int err; + + err = regmap_bulk_read(data->regmap, reg, ®val, 2); + if (err < 0) + return err; + + *val = regval[0] | (regval[1] << 8); + + return 0; +} + +static inline int adt7470_write_word_data(struct adt7470_data *data, unsigned int reg, + unsigned int val) +{ + u8 regval[2]; + + regval[0] = val & 0xFF; + regval[1] = val >> 8; + + return regmap_bulk_write(data->regmap, reg, ®val, 2); +} + +/* Probe for temperature sensors. Assumes lock is held */ +static int adt7470_read_temperatures(struct adt7470_data *data) +{ + unsigned long res; + unsigned int pwm_cfg[2]; + int err; + int i; + u8 pwm[ADT7470_FAN_COUNT]; + + /* save pwm[1-4] config register */ + err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0]); + if (err < 0) + return err; + err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1]); + if (err < 0) + return err; + + /* set manual pwm to whatever it is set to now */ + err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &pwm[0], + ADT7470_PWM_COUNT); + if (err < 0) + return err; + + /* put pwm in manual mode */ + err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(0), + ADT7470_PWM_AUTO_MASK, 0); + if (err < 0) + return err; + err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(2), + ADT7470_PWM_AUTO_MASK, 0); + if (err < 0) + return err; + + /* write pwm control to whatever it was */ + err = regmap_bulk_write(data->regmap, ADT7470_REG_PWM(0), &pwm[0], + ADT7470_PWM_COUNT); + if (err < 0) + return err; + + /* start reading temperature sensors */ + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG, + ADT7470_T05_STB_MASK, ADT7470_T05_STB_MASK); + if (err < 0) + return err; + + /* Delay is 200ms * number of temp sensors. */ + res = msleep_interruptible((data->num_temp_sensors >= 0 ? + data->num_temp_sensors * 200 : + TEMP_COLLECTION_TIME)); + + /* done reading temperature sensors */ + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG, + ADT7470_T05_STB_MASK, 0); + if (err < 0) + return err; + + /* restore pwm[1-4] config registers */ + err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]); + if (err < 0) + return err; + err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]); + if (err < 0) + return err; + + if (res) + return -EAGAIN; + + /* Only count fans if we have to */ + if (data->num_temp_sensors >= 0) + return 0; + + err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0], + ADT7470_TEMP_COUNT); + if (err < 0) + return err; + for (i = 0; i < ADT7470_TEMP_COUNT; i++) { + if (data->temp[i]) + data->num_temp_sensors = i + 1; + } + data->temperatures_probed = 1; + return 0; +} + +static int adt7470_update_thread(void *p) +{ + struct i2c_client *client = p; + struct adt7470_data *data = i2c_get_clientdata(client); + + while (!kthread_should_stop()) { + mutex_lock(&data->lock); + adt7470_read_temperatures(data); + mutex_unlock(&data->lock); + + if (kthread_should_stop()) + break; + + schedule_timeout_interruptible(msecs_to_jiffies(data->auto_update_interval)); + } + + return 0; +} + +static int adt7470_update_sensors(struct adt7470_data *data) +{ + unsigned int val; + int err; + int i; + + if (!data->temperatures_probed) + err = adt7470_read_temperatures(data); + else + err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0], + ADT7470_TEMP_COUNT); + if (err < 0) + return err; + + for (i = 0; i < ADT7470_FAN_COUNT; i++) { + err = adt7470_read_word_data(data, ADT7470_REG_FAN(i), &val); + if (err < 0) + return err; + data->fan[i] = val; + } + + err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &data->pwm[0], ADT7470_PWM_COUNT); + if (err < 0) + return err; + + for (i = 0; i < ADT7470_PWM_COUNT; i++) { + unsigned int mask; + + if (i % 2) + mask = ADT7470_PWM2_AUTO_MASK; + else + mask = ADT7470_PWM1_AUTO_MASK; + + err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(i), &val); + if (err < 0) + return err; + data->pwm_automatic[i] = !!(val & mask); + + err = regmap_read(data->regmap, ADT7470_REG_PWM_AUTO_TEMP(i), &val); + if (err < 0) + return err; + if (!(i % 2)) + data->pwm_auto_temp[i] = val >> 4; + else + data->pwm_auto_temp[i] = val & 0xF; + } + + err = regmap_read(data->regmap, ADT7470_REG_CFG, &val); + if (err < 0) + return err; + data->force_pwm_max = !!(val & ADT7470_FSPD_MASK); + + err = regmap_read(data->regmap, ADT7470_REG_ALARM1, &val); + if (err < 0) + return err; + data->alarm = val; + if (data->alarm & ADT7470_OOL_ALARM) { + err = regmap_read(data->regmap, ADT7470_REG_ALARM2, &val); + if (err < 0) + return err; + data->alarm |= ALARM2(val); + } + + err = adt7470_read_word_data(data, ADT7470_REG_ALARM1_MASK, &val); + if (err < 0) + return err; + data->alarms_mask = val; + + return 0; +} + +static int adt7470_update_limits(struct adt7470_data *data) +{ + unsigned int val; + int err; + int i; + + for (i = 0; i < ADT7470_TEMP_COUNT; i++) { + err = regmap_read(data->regmap, ADT7470_TEMP_MIN_REG(i), &val); + if (err < 0) + return err; + data->temp_min[i] = (s8)val; + err = regmap_read(data->regmap, ADT7470_TEMP_MAX_REG(i), &val); + if (err < 0) + return err; + data->temp_max[i] = (s8)val; + } + + for (i = 0; i < ADT7470_FAN_COUNT; i++) { + err = adt7470_read_word_data(data, ADT7470_REG_FAN_MIN(i), &val); + if (err < 0) + return err; + data->fan_min[i] = val; + err = adt7470_read_word_data(data, ADT7470_REG_FAN_MAX(i), &val); + if (err < 0) + return err; + data->fan_max[i] = val; + } + + for (i = 0; i < ADT7470_PWM_COUNT; i++) { + err = regmap_read(data->regmap, ADT7470_REG_PWM_MAX(i), &val); + if (err < 0) + return err; + data->pwm_max[i] = val; + err = regmap_read(data->regmap, ADT7470_REG_PWM_MIN(i), &val); + if (err < 0) + return err; + data->pwm_min[i] = val; + err = regmap_read(data->regmap, ADT7470_REG_PWM_TMIN(i), &val); + if (err < 0) + return err; + data->pwm_tmin[i] = (s8)val; + } + + return 0; +} + +static struct adt7470_data *adt7470_update_device(struct device *dev) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + unsigned long local_jiffies = jiffies; + int need_sensors = 1; + int need_limits = 1; + int err; + + /* + * Figure out if we need to update the shadow registers. + * Lockless means that we may occasionally report out of + * date data. + */ + if (time_before(local_jiffies, data->sensors_last_updated + + SENSOR_REFRESH_INTERVAL) && + data->sensors_valid) + need_sensors = 0; + + if (time_before(local_jiffies, data->limits_last_updated + + LIMIT_REFRESH_INTERVAL) && + data->limits_valid) + need_limits = 0; + + if (!need_sensors && !need_limits) + return data; + + mutex_lock(&data->lock); + if (need_sensors) { + err = adt7470_update_sensors(data); + if (err < 0) + goto out; + data->sensors_last_updated = local_jiffies; + data->sensors_valid = 1; + } + + if (need_limits) { + err = adt7470_update_limits(data); + if (err < 0) + goto out; + data->limits_last_updated = local_jiffies; + data->limits_valid = 1; + } +out: + mutex_unlock(&data->lock); + + return err < 0 ? ERR_PTR(err) : data; +} + +static ssize_t auto_update_interval_show(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->auto_update_interval); +} + +static ssize_t auto_update_interval_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = clamp_val(temp, 0, 60000); + + mutex_lock(&data->lock); + data->auto_update_interval = temp; + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t num_temp_sensors_show(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->num_temp_sensors); +} + +static ssize_t num_temp_sensors_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = clamp_val(temp, -1, 10); + + mutex_lock(&data->lock); + data->num_temp_sensors = temp; + if (temp < 0) + data->temperatures_probed = 0; + mutex_unlock(&data->lock); + + return count; +} + +static int adt7470_temp_read(struct device *dev, u32 attr, int channel, long *val) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + switch (attr) { + case hwmon_temp_input: + *val = 1000 * data->temp[channel]; + break; + case hwmon_temp_min: + *val = 1000 * data->temp_min[channel]; + break; + case hwmon_temp_max: + *val = 1000 * data->temp_max[channel]; + break; + case hwmon_temp_alarm: + *val = !!(data->alarm & channel); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int adt7470_temp_write(struct device *dev, u32 attr, int channel, long val) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + int err; + + val = clamp_val(val, -128000, 127000); + val = DIV_ROUND_CLOSEST(val, 1000); + + switch (attr) { + case hwmon_temp_min: + mutex_lock(&data->lock); + data->temp_min[channel] = val; + err = regmap_write(data->regmap, ADT7470_TEMP_MIN_REG(channel), val); + mutex_unlock(&data->lock); + break; + case hwmon_temp_max: + mutex_lock(&data->lock); + data->temp_max[channel] = val; + err = regmap_write(data->regmap, ADT7470_TEMP_MAX_REG(channel), val); + mutex_unlock(&data->lock); + break; + default: + return -EOPNOTSUPP; + } + + return err; +} + +static ssize_t alarm_mask_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%x\n", data->alarms_mask); +} + +static ssize_t alarm_mask_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + long mask; + int err; + + if (kstrtoul(buf, 0, &mask)) + return -EINVAL; + + if (mask & ~0xffff) + return -EINVAL; + + mutex_lock(&data->lock); + data->alarms_mask = mask; + err = adt7470_write_word_data(data, ADT7470_REG_ALARM1_MASK, mask); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +static int adt7470_fan_read(struct device *dev, u32 attr, int channel, long *val) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + switch (attr) { + case hwmon_fan_input: + if (FAN_DATA_VALID(data->fan[channel])) + *val = FAN_PERIOD_TO_RPM(data->fan[channel]); + else + *val = 0; + break; + case hwmon_fan_min: + if (FAN_DATA_VALID(data->fan_min[channel])) + *val = FAN_PERIOD_TO_RPM(data->fan_min[channel]); + else + *val = 0; + break; + case hwmon_fan_max: + if (FAN_DATA_VALID(data->fan_max[channel])) + *val = FAN_PERIOD_TO_RPM(data->fan_max[channel]); + else + *val = 0; + break; + case hwmon_fan_alarm: + *val = !!(data->alarm & (1 << (12 + channel))); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int adt7470_fan_write(struct device *dev, u32 attr, int channel, long val) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + int err; + + if (val <= 0) + return -EINVAL; + + val = FAN_RPM_TO_PERIOD(val); + val = clamp_val(val, 1, 65534); + + switch (attr) { + case hwmon_fan_min: + mutex_lock(&data->lock); + data->fan_min[channel] = val; + err = adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(channel), val); + mutex_unlock(&data->lock); + break; + case hwmon_fan_max: + mutex_lock(&data->lock); + data->fan_max[channel] = val; + err = adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(channel), val); + mutex_unlock(&data->lock); + break; + default: + return -EOPNOTSUPP; + } + + return err; +} + +static ssize_t force_pwm_max_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->force_pwm_max); +} + +static ssize_t force_pwm_max_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + int err; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + mutex_lock(&data->lock); + data->force_pwm_max = temp; + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG, + ADT7470_FSPD_MASK, + temp ? ADT7470_FSPD_MASK : 0); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +/* These are the valid PWM frequencies to the nearest Hz */ +static const int adt7470_freq_map[] = { + 11, 15, 22, 29, 35, 44, 59, 88, 1400, 22500 +}; + +static int pwm1_freq_get(struct device *dev) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + unsigned int cfg_reg_1, cfg_reg_2; + int index; + int err; + + mutex_lock(&data->lock); + err = regmap_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1); + if (err < 0) + goto out; + err = regmap_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2); + if (err < 0) + goto out; + mutex_unlock(&data->lock); + + index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT; + if (!(cfg_reg_1 & ADT7470_CFG_LF)) + index += 8; + if (index >= ARRAY_SIZE(adt7470_freq_map)) + index = ARRAY_SIZE(adt7470_freq_map) - 1; + + return adt7470_freq_map[index]; + +out: + mutex_unlock(&data->lock); + return err; +} + +static int adt7470_pwm_read(struct device *dev, u32 attr, int channel, long *val) +{ + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + switch (attr) { + case hwmon_pwm_input: + *val = data->pwm[channel]; + break; + case hwmon_pwm_enable: + *val = 1 + data->pwm_automatic[channel]; + break; + case hwmon_pwm_freq: + *val = pwm1_freq_get(dev); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int pwm1_freq_set(struct device *dev, long freq) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + unsigned int low_freq = ADT7470_CFG_LF; + int index; + int err; + + /* Round the user value given to the closest available frequency */ + index = find_closest(freq, adt7470_freq_map, + ARRAY_SIZE(adt7470_freq_map)); + + if (index >= 8) { + index -= 8; + low_freq = 0; + } + + mutex_lock(&data->lock); + /* Configuration Register 1 */ + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG, + ADT7470_CFG_LF, low_freq); + if (err < 0) + goto out; + + /* Configuration Register 2 */ + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG_2, + ADT7470_FREQ_MASK, + index << ADT7470_FREQ_SHIFT); +out: + mutex_unlock(&data->lock); + + return err; +} + +static int adt7470_pwm_write(struct device *dev, u32 attr, int channel, long val) +{ + struct adt7470_data *data = dev_get_drvdata(dev); + unsigned int pwm_auto_reg_mask; + int err; + + switch (attr) { + case hwmon_pwm_input: + val = clamp_val(val, 0, 255); + mutex_lock(&data->lock); + data->pwm[channel] = val; + err = regmap_write(data->regmap, ADT7470_REG_PWM(channel), + data->pwm[channel]); + mutex_unlock(&data->lock); + break; + case hwmon_pwm_enable: + if (channel % 2) + pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK; + else + pwm_auto_reg_mask = ADT7470_PWM1_AUTO_MASK; + + if (val != 2 && val != 1) + return -EINVAL; + val--; + + mutex_lock(&data->lock); + data->pwm_automatic[channel] = val; + err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(channel), + pwm_auto_reg_mask, + val ? pwm_auto_reg_mask : 0); + mutex_unlock(&data->lock); + break; + case hwmon_pwm_freq: + err = pwm1_freq_set(dev, val); + break; + default: + return -EOPNOTSUPP; + } + + return err; +} + +static ssize_t pwm_max_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->pwm_max[attr->index]); +} + +static ssize_t pwm_max_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + int err; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = clamp_val(temp, 0, 255); + + mutex_lock(&data->lock); + data->pwm_max[attr->index] = temp; + err = regmap_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index), + temp); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +static ssize_t pwm_min_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->pwm_min[attr->index]); +} + +static ssize_t pwm_min_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + int err; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = clamp_val(temp, 0, 255); + + mutex_lock(&data->lock); + data->pwm_min[attr->index] = temp; + err = regmap_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index), + temp); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +static ssize_t pwm_tmax_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + /* the datasheet says that tmax = tmin + 20C */ + return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index])); +} + +static ssize_t pwm_tmin_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = adt7470_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]); +} + +static ssize_t pwm_tmin_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = dev_get_drvdata(dev); + long temp; + int err; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = clamp_val(temp, -128000, 127000); + temp = DIV_ROUND_CLOSEST(temp, 1000); + + mutex_lock(&data->lock); + data->pwm_tmin[attr->index] = temp; + err = regmap_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index), + temp); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +static ssize_t pwm_auto_temp_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = adt7470_update_device(dev); + u8 ctrl; + + if (IS_ERR(data)) + return PTR_ERR(data); + + ctrl = data->pwm_auto_temp[attr->index]; + if (ctrl) + return sprintf(buf, "%d\n", 1 << (ctrl - 1)); + else + return sprintf(buf, "%d\n", ADT7470_PWM_ALL_TEMPS); +} + +static int cvt_auto_temp(int input) +{ + if (input == ADT7470_PWM_ALL_TEMPS) + return 0; + if (input < 1 || !is_power_of_2(input)) + return -EINVAL; + return ilog2(input) + 1; +} + +static ssize_t pwm_auto_temp_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct adt7470_data *data = dev_get_drvdata(dev); + int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index); + unsigned int mask, val; + long temp; + int err; + + if (kstrtol(buf, 10, &temp)) + return -EINVAL; + + temp = cvt_auto_temp(temp); + if (temp < 0) + return temp; + + mutex_lock(&data->lock); + data->pwm_automatic[attr->index] = temp; + + if (!(attr->index % 2)) { + mask = 0xF0; + val = (temp << 4) & 0xF0; + } else { + mask = 0x0F; + val = temp & 0x0F; + } + + err = regmap_update_bits(data->regmap, pwm_auto_reg, mask, val); + mutex_unlock(&data->lock); + + return err < 0 ? err : count; +} + +static DEVICE_ATTR_RW(alarm_mask); +static DEVICE_ATTR_RW(num_temp_sensors); +static DEVICE_ATTR_RW(auto_update_interval); + +static SENSOR_DEVICE_ATTR_RW(force_pwm_max, force_pwm_max, 0); + +static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm_min, 0); +static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm_min, 1); +static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm_min, 2); +static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_pwm, pwm_min, 3); + +static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm_max, 0); +static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm_max, 1); +static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm_max, 2); +static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point2_pwm, pwm_max, 3); + +static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_tmin, 0); +static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_temp, pwm_tmin, 1); +static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_temp, pwm_tmin, 2); +static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_temp, pwm_tmin, 3); + +static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_temp, pwm_tmax, 0); +static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point2_temp, pwm_tmax, 1); +static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point2_temp, pwm_tmax, 2); +static SENSOR_DEVICE_ATTR_RO(pwm4_auto_point2_temp, pwm_tmax, 3); + +static SENSOR_DEVICE_ATTR_RW(pwm1_auto_channels_temp, pwm_auto_temp, 0); +static SENSOR_DEVICE_ATTR_RW(pwm2_auto_channels_temp, pwm_auto_temp, 1); +static SENSOR_DEVICE_ATTR_RW(pwm3_auto_channels_temp, pwm_auto_temp, 2); +static SENSOR_DEVICE_ATTR_RW(pwm4_auto_channels_temp, pwm_auto_temp, 3); + +static struct attribute *adt7470_attrs[] = { + &dev_attr_alarm_mask.attr, + &dev_attr_num_temp_sensors.attr, + &dev_attr_auto_update_interval.attr, + &sensor_dev_attr_force_pwm_max.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm4_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm4_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm4_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm4_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr, + &sensor_dev_attr_pwm4_auto_channels_temp.dev_attr.attr, + NULL +}; + +ATTRIBUTE_GROUPS(adt7470); + +static int adt7470_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + switch (type) { + case hwmon_temp: + return adt7470_temp_read(dev, attr, channel, val); + case hwmon_fan: + return adt7470_fan_read(dev, attr, channel, val); + case hwmon_pwm: + return adt7470_pwm_read(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int adt7470_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long val) +{ + switch (type) { + case hwmon_temp: + return adt7470_temp_write(dev, attr, channel, val); + case hwmon_fan: + return adt7470_fan_write(dev, attr, channel, val); + case hwmon_pwm: + return adt7470_pwm_write(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static umode_t adt7470_is_visible(const void *_data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + umode_t mode = 0; + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp: + case hwmon_temp_alarm: + mode = 0444; + break; + case hwmon_temp_min: + case hwmon_temp_max: + mode = 0644; + break; + default: + break; + } + break; + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: + case hwmon_fan_alarm: + mode = 0444; + break; + case hwmon_fan_min: + case hwmon_fan_max: + mode = 0644; + break; + default: + break; + } + break; + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_input: + case hwmon_pwm_enable: + mode = 0644; + break; + case hwmon_pwm_freq: + if (channel == 0) + mode = 0644; + else + mode = 0; + break; + default: + break; + } + break; + default: + break; + } + + return mode; +} + +static const struct hwmon_ops adt7470_hwmon_ops = { + .is_visible = adt7470_is_visible, + .read = adt7470_read, + .write = adt7470_write, +}; + +static const struct hwmon_channel_info *adt7470_info[] = { + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM, + HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM), + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM), + HWMON_CHANNEL_INFO(pwm, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_FREQ, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE), + NULL +}; + +static const struct hwmon_chip_info adt7470_chip_info = { + .ops = &adt7470_hwmon_ops, + .info = adt7470_info, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int adt7470_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + int vendor, device, revision; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR); + if (vendor != ADT7470_VENDOR) + return -ENODEV; + + device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE); + if (device != ADT7470_DEVICE) + return -ENODEV; + + revision = i2c_smbus_read_byte_data(client, ADT7470_REG_REVISION); + if (revision != ADT7470_REVISION) + return -ENODEV; + + strscpy(info->type, "adt7470", I2C_NAME_SIZE); + + return 0; +} + +static const struct regmap_config adt7470_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .use_single_read = true, + .use_single_write = true, +}; + +static int adt7470_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct adt7470_data *data; + struct device *hwmon_dev; + int err; + + data = devm_kzalloc(dev, sizeof(struct adt7470_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->num_temp_sensors = -1; + data->auto_update_interval = AUTO_UPDATE_INTERVAL; + data->regmap = devm_regmap_init_i2c(client, &adt7470_regmap_config); + if (IS_ERR(data->regmap)) + return PTR_ERR(data->regmap); + + i2c_set_clientdata(client, data); + mutex_init(&data->lock); + + dev_info(&client->dev, "%s chip found\n", client->name); + + /* Initialize the ADT7470 chip */ + err = regmap_update_bits(data->regmap, ADT7470_REG_CFG, + ADT7470_STRT_MASK | ADT7470_TEST_MASK, + ADT7470_STRT_MASK | ADT7470_TEST_MASK); + if (err < 0) + return err; + + /* Register sysfs hooks */ + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, + &adt7470_chip_info, + adt7470_groups); + + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + data->auto_update = kthread_run(adt7470_update_thread, client, "%s", + dev_name(hwmon_dev)); + if (IS_ERR(data->auto_update)) + return PTR_ERR(data->auto_update); + + return 0; +} + +static void adt7470_remove(struct i2c_client *client) +{ + struct adt7470_data *data = i2c_get_clientdata(client); + + kthread_stop(data->auto_update); +} + +static const struct i2c_device_id adt7470_id[] = { + { "adt7470", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adt7470_id); + +static struct i2c_driver adt7470_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "adt7470", + }, + .probe_new = adt7470_probe, + .remove = adt7470_remove, + .id_table = adt7470_id, + .detect = adt7470_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(adt7470_driver); + +MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); +MODULE_DESCRIPTION("ADT7470 driver"); +MODULE_LICENSE("GPL"); |