diff options
Diffstat (limited to 'drivers/hwmon/w83l786ng.c')
| -rw-r--r-- | drivers/hwmon/w83l786ng.c | 765 |
1 files changed, 765 insertions, 0 deletions
diff --git a/drivers/hwmon/w83l786ng.c b/drivers/hwmon/w83l786ng.c new file mode 100644 index 000000000..2c4646fa8 --- /dev/null +++ b/drivers/hwmon/w83l786ng.c @@ -0,0 +1,765 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * w83l786ng.c - Linux kernel driver for hardware monitoring + * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org> + */ + +/* + * Supports following chips: + * + * Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA + * w83l786ng 3 2 2 2 0x7b 0x5ca3 yes no + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-vid.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/jiffies.h> + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END }; + +/* Insmod parameters */ + +static bool reset; +module_param(reset, bool, 0); +MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended"); + +#define W83L786NG_REG_IN_MIN(nr) (0x2C + (nr) * 2) +#define W83L786NG_REG_IN_MAX(nr) (0x2B + (nr) * 2) +#define W83L786NG_REG_IN(nr) ((nr) + 0x20) + +#define W83L786NG_REG_FAN(nr) ((nr) + 0x28) +#define W83L786NG_REG_FAN_MIN(nr) ((nr) + 0x3B) + +#define W83L786NG_REG_CONFIG 0x40 +#define W83L786NG_REG_ALARM1 0x41 +#define W83L786NG_REG_ALARM2 0x42 +#define W83L786NG_REG_GPIO_EN 0x47 +#define W83L786NG_REG_MAN_ID2 0x4C +#define W83L786NG_REG_MAN_ID1 0x4D +#define W83L786NG_REG_CHIP_ID 0x4E + +#define W83L786NG_REG_DIODE 0x53 +#define W83L786NG_REG_FAN_DIV 0x54 +#define W83L786NG_REG_FAN_CFG 0x80 + +#define W83L786NG_REG_TOLERANCE 0x8D + +static const u8 W83L786NG_REG_TEMP[2][3] = { + { 0x25, /* TEMP 0 in DataSheet */ + 0x35, /* TEMP 0 Over in DataSheet */ + 0x36 }, /* TEMP 0 Hyst in DataSheet */ + { 0x26, /* TEMP 1 in DataSheet */ + 0x37, /* TEMP 1 Over in DataSheet */ + 0x38 } /* TEMP 1 Hyst in DataSheet */ +}; + +static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7}; +static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4}; + +/* FAN Duty Cycle, be used to control */ +static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87}; + + +static inline u8 +FAN_TO_REG(long rpm, int div) +{ + if (rpm == 0) + return 255; + rpm = clamp_val(rpm, 1, 1000000); + return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); +} + +#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \ + ((val) == 255 ? 0 : \ + 1350000 / ((val) * (div)))) + +/* for temp */ +#define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \ + : (val)) / 1000, 0, 0xff)) +#define TEMP_FROM_REG(val) (((val) & 0x80 ? \ + (val) - 0x100 : (val)) * 1000) + +/* + * The analog voltage inputs have 8mV LSB. Since the sysfs output is + * in mV as would be measured on the chip input pin, need to just + * multiply/divide by 8 to translate from/to register values. + */ +#define IN_TO_REG(val) (clamp_val((((val) + 4) / 8), 0, 255)) +#define IN_FROM_REG(val) ((val) * 8) + +#define DIV_FROM_REG(val) (1 << (val)) + +static inline u8 +DIV_TO_REG(long val) +{ + int i; + val = clamp_val(val, 1, 128) >> 1; + for (i = 0; i < 7; i++) { + if (val == 0) + break; + val >>= 1; + } + return (u8)i; +} + +struct w83l786ng_data { + struct i2c_client *client; + struct mutex update_lock; + bool valid; /* true if following fields are valid */ + unsigned long last_updated; /* In jiffies */ + unsigned long last_nonvolatile; /* In jiffies, last time we update the + * nonvolatile registers */ + + u8 in[3]; + u8 in_max[3]; + u8 in_min[3]; + u8 fan[2]; + u8 fan_div[2]; + u8 fan_min[2]; + u8 temp_type[2]; + u8 temp[2][3]; + u8 pwm[2]; + u8 pwm_mode[2]; /* 0->DC variable voltage + * 1->PWM variable duty cycle */ + + u8 pwm_enable[2]; /* 1->manual + * 2->thermal cruise (also called SmartFan I) */ + u8 tolerance[2]; +}; + +static u8 +w83l786ng_read_value(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static int +w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value) +{ + return i2c_smbus_write_byte_data(client, reg, value); +} + +static struct w83l786ng_data *w83l786ng_update_device(struct device *dev) +{ + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int i, j; + u8 reg_tmp, pwmcfg; + + mutex_lock(&data->update_lock); + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + dev_dbg(&client->dev, "Updating w83l786ng data.\n"); + + /* Update the voltages measured value and limits */ + for (i = 0; i < 3; i++) { + data->in[i] = w83l786ng_read_value(client, + W83L786NG_REG_IN(i)); + data->in_min[i] = w83l786ng_read_value(client, + W83L786NG_REG_IN_MIN(i)); + data->in_max[i] = w83l786ng_read_value(client, + W83L786NG_REG_IN_MAX(i)); + } + + /* Update the fan counts and limits */ + for (i = 0; i < 2; i++) { + data->fan[i] = w83l786ng_read_value(client, + W83L786NG_REG_FAN(i)); + data->fan_min[i] = w83l786ng_read_value(client, + W83L786NG_REG_FAN_MIN(i)); + } + + /* Update the fan divisor */ + reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV); + data->fan_div[0] = reg_tmp & 0x07; + data->fan_div[1] = (reg_tmp >> 4) & 0x07; + + pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); + for (i = 0; i < 2; i++) { + data->pwm_mode[i] = + ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1) + ? 0 : 1; + data->pwm_enable[i] = + ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1; + data->pwm[i] = + (w83l786ng_read_value(client, W83L786NG_REG_PWM[i]) + & 0x0f) * 0x11; + } + + + /* Update the temperature sensors */ + for (i = 0; i < 2; i++) { + for (j = 0; j < 3; j++) { + data->temp[i][j] = w83l786ng_read_value(client, + W83L786NG_REG_TEMP[i][j]); + } + } + + /* Update Smart Fan I/II tolerance */ + reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE); + data->tolerance[0] = reg_tmp & 0x0f; + data->tolerance[1] = (reg_tmp >> 4) & 0x0f; + + data->last_updated = jiffies; + data->valid = true; + + } + + mutex_unlock(&data->update_lock); + + return data; +} + +/* following are the sysfs callback functions */ +#define show_in_reg(reg) \ +static ssize_t \ +show_##reg(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct w83l786ng_data *data = w83l786ng_update_device(dev); \ + return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \ +} + +show_in_reg(in) +show_in_reg(in_min) +show_in_reg(in_max) + +#define store_in_reg(REG, reg) \ +static ssize_t \ +store_in_##reg(struct device *dev, struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct w83l786ng_data *data = dev_get_drvdata(dev); \ + struct i2c_client *client = data->client; \ + unsigned long val; \ + int err = kstrtoul(buf, 10, &val); \ + if (err) \ + return err; \ + mutex_lock(&data->update_lock); \ + data->in_##reg[nr] = IN_TO_REG(val); \ + w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \ + data->in_##reg[nr]); \ + mutex_unlock(&data->update_lock); \ + return count; \ +} + +store_in_reg(MIN, min) +store_in_reg(MAX, max) + +static struct sensor_device_attribute sda_in_input[] = { + SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0), + SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1), + SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2), +}; + +static struct sensor_device_attribute sda_in_min[] = { + SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0), + SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1), + SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2), +}; + +static struct sensor_device_attribute sda_in_max[] = { + SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0), + SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1), + SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2), +}; + +#define show_fan_reg(reg) \ +static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct w83l786ng_data *data = w83l786ng_update_device(dev); \ + return sprintf(buf, "%d\n", \ + FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \ +} + +show_fan_reg(fan); +show_fan_reg(fan_min); + +static ssize_t +store_fan_min(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); + w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr), + data->fan_min[nr]); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t +show_fan_div(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = w83l786ng_update_device(dev); + return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr])); +} + +/* + * Note: we save and restore the fan minimum here, because its value is + * determined in part by the fan divisor. This follows the principle of + * least surprise; the user doesn't expect the fan minimum to change just + * because the divisor changed. + */ +static ssize_t +store_fan_div(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + + unsigned long min; + u8 tmp_fan_div; + u8 fan_div_reg; + u8 keep_mask = 0; + u8 new_shift = 0; + + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + /* Save fan_min */ + mutex_lock(&data->update_lock); + min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])); + + data->fan_div[nr] = DIV_TO_REG(val); + + switch (nr) { + case 0: + keep_mask = 0xf8; + new_shift = 0; + break; + case 1: + keep_mask = 0x8f; + new_shift = 4; + break; + } + + fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV) + & keep_mask; + + tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask; + + w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV, + fan_div_reg | tmp_fan_div); + + /* Restore fan_min */ + data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); + w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr), + data->fan_min[nr]); + mutex_unlock(&data->update_lock); + + return count; +} + +static struct sensor_device_attribute sda_fan_input[] = { + SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0), + SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1), +}; + +static struct sensor_device_attribute sda_fan_min[] = { + SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min, + store_fan_min, 0), + SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min, + store_fan_min, 1), +}; + +static struct sensor_device_attribute sda_fan_div[] = { + SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div, + store_fan_div, 0), + SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div, + store_fan_div, 1), +}; + + +/* read/write the temperature, includes measured value and limits */ + +static ssize_t +show_temp(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int index = sensor_attr->index; + struct w83l786ng_data *data = w83l786ng_update_device(dev); + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index])); +} + +static ssize_t +store_temp(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int index = sensor_attr->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->temp[nr][index] = TEMP_TO_REG(val); + w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index], + data->temp[nr][index]); + mutex_unlock(&data->update_lock); + + return count; +} + +static struct sensor_device_attribute_2 sda_temp_input[] = { + SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0), + SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0), +}; + +static struct sensor_device_attribute_2 sda_temp_max[] = { + SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, + show_temp, store_temp, 0, 1), + SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, + show_temp, store_temp, 1, 1), +}; + +static struct sensor_device_attribute_2 sda_temp_max_hyst[] = { + SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR, + show_temp, store_temp, 0, 2), + SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR, + show_temp, store_temp, 1, 2), +}; + +#define show_pwm_reg(reg) \ +static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct w83l786ng_data *data = w83l786ng_update_device(dev); \ + int nr = to_sensor_dev_attr(attr)->index; \ + return sprintf(buf, "%d\n", data->reg[nr]); \ +} + +show_pwm_reg(pwm_mode) +show_pwm_reg(pwm_enable) +show_pwm_reg(pwm) + +static ssize_t +store_pwm_mode(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + u8 reg; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + if (val > 1) + return -EINVAL; + mutex_lock(&data->update_lock); + data->pwm_mode[nr] = val; + reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); + reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]); + if (!val) + reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr]; + w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t +store_pwm(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + val = clamp_val(val, 0, 255); + val = DIV_ROUND_CLOSEST(val, 0x11); + + mutex_lock(&data->update_lock); + data->pwm[nr] = val * 0x11; + val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0; + w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t +store_pwm_enable(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + u8 reg; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + if (!val || val > 2) /* only modes 1 and 2 are supported */ + return -EINVAL; + + mutex_lock(&data->update_lock); + reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); + data->pwm_enable[nr] = val; + reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]); + reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr]; + w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg); + mutex_unlock(&data->update_lock); + return count; +} + +static struct sensor_device_attribute sda_pwm[] = { + SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0), + SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1), +}; + +static struct sensor_device_attribute sda_pwm_mode[] = { + SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode, + store_pwm_mode, 0), + SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode, + store_pwm_mode, 1), +}; + +static struct sensor_device_attribute sda_pwm_enable[] = { + SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable, + store_pwm_enable, 0), + SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable, + store_pwm_enable, 1), +}; + +/* For Smart Fan I/Thermal Cruise and Smart Fan II */ +static ssize_t +show_tolerance(struct device *dev, struct device_attribute *attr, char *buf) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = w83l786ng_update_device(dev); + return sprintf(buf, "%ld\n", (long)data->tolerance[nr]); +} + +static ssize_t +store_tolerance(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct w83l786ng_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + u8 tol_tmp, tol_mask; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + tol_mask = w83l786ng_read_value(client, + W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0); + tol_tmp = clamp_val(val, 0, 15); + tol_tmp &= 0x0f; + data->tolerance[nr] = tol_tmp; + if (nr == 1) + tol_tmp <<= 4; + + w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE, + tol_mask | tol_tmp); + mutex_unlock(&data->update_lock); + return count; +} + +static struct sensor_device_attribute sda_tolerance[] = { + SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO, + show_tolerance, store_tolerance, 0), + SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO, + show_tolerance, store_tolerance, 1), +}; + + +#define IN_UNIT_ATTRS(X) \ + &sda_in_input[X].dev_attr.attr, \ + &sda_in_min[X].dev_attr.attr, \ + &sda_in_max[X].dev_attr.attr + +#define FAN_UNIT_ATTRS(X) \ + &sda_fan_input[X].dev_attr.attr, \ + &sda_fan_min[X].dev_attr.attr, \ + &sda_fan_div[X].dev_attr.attr + +#define TEMP_UNIT_ATTRS(X) \ + &sda_temp_input[X].dev_attr.attr, \ + &sda_temp_max[X].dev_attr.attr, \ + &sda_temp_max_hyst[X].dev_attr.attr + +#define PWM_UNIT_ATTRS(X) \ + &sda_pwm[X].dev_attr.attr, \ + &sda_pwm_mode[X].dev_attr.attr, \ + &sda_pwm_enable[X].dev_attr.attr + +#define TOLERANCE_UNIT_ATTRS(X) \ + &sda_tolerance[X].dev_attr.attr + +static struct attribute *w83l786ng_attrs[] = { + IN_UNIT_ATTRS(0), + IN_UNIT_ATTRS(1), + IN_UNIT_ATTRS(2), + FAN_UNIT_ATTRS(0), + FAN_UNIT_ATTRS(1), + TEMP_UNIT_ATTRS(0), + TEMP_UNIT_ATTRS(1), + PWM_UNIT_ATTRS(0), + PWM_UNIT_ATTRS(1), + TOLERANCE_UNIT_ATTRS(0), + TOLERANCE_UNIT_ATTRS(1), + NULL +}; + +ATTRIBUTE_GROUPS(w83l786ng); + +static int +w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + u16 man_id; + u8 chip_id; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* Detection */ + if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) { + dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n", + client->addr); + return -ENODEV; + } + + /* Identification */ + man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) + + w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2); + chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID); + + if (man_id != 0x5CA3 || /* Winbond */ + chip_id != 0x80) { /* W83L786NG */ + dev_dbg(&adapter->dev, + "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n", + man_id, chip_id); + return -ENODEV; + } + + strscpy(info->type, "w83l786ng", I2C_NAME_SIZE); + + return 0; +} + +static void w83l786ng_init_client(struct i2c_client *client) +{ + u8 tmp; + + if (reset) + w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80); + + /* Start monitoring */ + tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG); + if (!(tmp & 0x01)) + w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01); +} + +static int +w83l786ng_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct w83l786ng_data *data; + struct device *hwmon_dev; + int i; + u8 reg_tmp; + + data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + mutex_init(&data->update_lock); + + /* Initialize the chip */ + w83l786ng_init_client(client); + + /* A few vars need to be filled upon startup */ + for (i = 0; i < 2; i++) { + data->fan_min[i] = w83l786ng_read_value(client, + W83L786NG_REG_FAN_MIN(i)); + } + + /* Update the fan divisor */ + reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV); + data->fan_div[0] = reg_tmp & 0x07; + data->fan_div[1] = (reg_tmp >> 4) & 0x07; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + data, + w83l786ng_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct i2c_device_id w83l786ng_id[] = { + { "w83l786ng", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, w83l786ng_id); + +static struct i2c_driver w83l786ng_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "w83l786ng", + }, + .probe_new = w83l786ng_probe, + .id_table = w83l786ng_id, + .detect = w83l786ng_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(w83l786ng_driver); + +MODULE_AUTHOR("Kevin Lo"); +MODULE_DESCRIPTION("w83l786ng driver"); +MODULE_LICENSE("GPL"); |