// SPDX-License-Identifier: GPL-2.0-or-later /* * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Copyright (C) 2009 T. Mertelj * * Based on max6650.c: * Copyright (C) 2007 Hans J. Koch * * Conversion to regmap and with_info API: * Copyright (C) 2024 Guenter Roeck */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Addresses to scan. */ static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END}; /* * Insmod parameters */ static int pwminv; /*Inverted PWM output. */ module_param(pwminv, int, 0444); static int init = 1; /*Power-on initialization.*/ module_param(init, int, 0444); #define AMC6821_REG_DEV_ID 0x3D #define AMC6821_REG_COMP_ID 0x3E #define AMC6821_REG_CONF1 0x00 #define AMC6821_REG_CONF2 0x01 #define AMC6821_REG_CONF3 0x3F #define AMC6821_REG_CONF4 0x04 #define AMC6821_REG_STAT1 0x02 #define AMC6821_REG_STAT2 0x03 #define AMC6821_REG_TEMP_LO 0x06 #define AMC6821_REG_TDATA_LOW 0x08 #define AMC6821_REG_TDATA_HI 0x09 #define AMC6821_REG_LTEMP_HI 0x0A #define AMC6821_REG_RTEMP_HI 0x0B #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18 #define AMC6821_REG_LTEMP_CRIT 0x1B #define AMC6821_REG_RTEMP_CRIT 0x1D #define AMC6821_REG_PSV_TEMP 0x1C #define AMC6821_REG_DCY 0x22 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25 #define AMC6821_REG_DCY_LOW_TEMP 0x21 #define AMC6821_REG_TACH_LLIMITL 0x10 #define AMC6821_REG_TACH_HLIMITL 0x12 #define AMC6821_REG_TACH_SETTINGL 0x1e #define AMC6821_CONF1_START BIT(0) #define AMC6821_CONF1_FAN_INT_EN BIT(1) #define AMC6821_CONF1_FANIE BIT(2) #define AMC6821_CONF1_PWMINV BIT(3) #define AMC6821_CONF1_FAN_FAULT_EN BIT(4) #define AMC6821_CONF1_FDRC0 BIT(5) #define AMC6821_CONF1_FDRC1 BIT(6) #define AMC6821_CONF1_THERMOVIE BIT(7) #define AMC6821_CONF2_PWM_EN BIT(0) #define AMC6821_CONF2_TACH_MODE BIT(1) #define AMC6821_CONF2_TACH_EN BIT(2) #define AMC6821_CONF2_RTFIE BIT(3) #define AMC6821_CONF2_LTOIE BIT(4) #define AMC6821_CONF2_RTOIE BIT(5) #define AMC6821_CONF2_PSVIE BIT(6) #define AMC6821_CONF2_RST BIT(7) #define AMC6821_CONF3_THERM_FAN_EN BIT(7) #define AMC6821_CONF3_REV_MASK GENMASK(3, 0) #define AMC6821_CONF4_OVREN BIT(4) #define AMC6821_CONF4_TACH_FAST BIT(5) #define AMC6821_CONF4_PSPR BIT(6) #define AMC6821_CONF4_MODE BIT(7) #define AMC6821_STAT1_RPM_ALARM BIT(0) #define AMC6821_STAT1_FANS BIT(1) #define AMC6821_STAT1_RTH BIT(2) #define AMC6821_STAT1_RTL BIT(3) #define AMC6821_STAT1_R_THERM BIT(4) #define AMC6821_STAT1_RTF BIT(5) #define AMC6821_STAT1_LTH BIT(6) #define AMC6821_STAT1_LTL BIT(7) #define AMC6821_STAT2_RTC BIT(3) #define AMC6821_STAT2_LTC BIT(4) #define AMC6821_STAT2_LPSV BIT(5) #define AMC6821_STAT2_L_THERM BIT(6) #define AMC6821_STAT2_THERM_IN BIT(7) #define AMC6821_TEMP_SLOPE_MASK GENMASK(2, 0) #define AMC6821_TEMP_LIMIT_MASK GENMASK(7, 3) /* * Client data (each client gets its own) */ struct amc6821_data { struct regmap *regmap; struct mutex update_lock; }; /* * Return 0 on success or negative error code. * * temps returns set of three temperatures, in °C: * temps[0]: Passive cooling temperature, applies to both channels * temps[1]: Low temperature, start slope calculations * temps[2]: High temperature * * Channel 0: local, channel 1: remote. */ static int amc6821_get_auto_point_temps(struct regmap *regmap, int channel, u8 *temps) { u32 pwm, regval; int err; err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm); if (err) return err; err = regmap_read(regmap, AMC6821_REG_PSV_TEMP, ®val); if (err) return err; temps[0] = regval; err = regmap_read(regmap, channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL, ®val); if (err) return err; temps[1] = FIELD_GET(AMC6821_TEMP_LIMIT_MASK, regval) * 4; /* slope is 32 >> in °C */ regval = 32 >> FIELD_GET(AMC6821_TEMP_SLOPE_MASK, regval); if (regval) temps[2] = temps[1] + DIV_ROUND_CLOSEST(255 - pwm, regval); else temps[2] = 255; return 0; } static int amc6821_temp_read_values(struct regmap *regmap, u32 attr, int channel, long *val) { int reg, err; u32 regval; switch (attr) { case hwmon_temp_input: reg = channel ? AMC6821_REG_RTEMP_HI : AMC6821_REG_LTEMP_HI; break; case hwmon_temp_min: reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN; break; case hwmon_temp_max: reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX; break; case hwmon_temp_crit: reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT; break; default: return -EOPNOTSUPP; } err = regmap_read(regmap, reg, ®val); if (err) return err; *val = sign_extend32(regval, 7) * 1000; return 0; } static int amc6821_read_alarms(struct regmap *regmap, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { int reg, mask, err; u32 regval; switch (type) { case hwmon_temp: switch (attr) { case hwmon_temp_min_alarm: reg = AMC6821_REG_STAT1; mask = channel ? AMC6821_STAT1_RTL : AMC6821_STAT1_LTL; break; case hwmon_temp_max_alarm: reg = AMC6821_REG_STAT1; mask = channel ? AMC6821_STAT1_RTH : AMC6821_STAT1_LTH; break; case hwmon_temp_crit_alarm: reg = AMC6821_REG_STAT2; mask = channel ? AMC6821_STAT2_RTC : AMC6821_STAT2_LTC; break; case hwmon_temp_fault: reg = AMC6821_REG_STAT1; mask = AMC6821_STAT1_RTF; break; default: return -EOPNOTSUPP; } break; case hwmon_fan: switch (attr) { case hwmon_fan_fault: reg = AMC6821_REG_STAT1; mask = AMC6821_STAT1_FANS; break; default: return -EOPNOTSUPP; } break; default: return -EOPNOTSUPP; } err = regmap_read(regmap, reg, ®val); if (err) return err; *val = !!(regval & mask); return 0; } static int amc6821_temp_read(struct device *dev, u32 attr, int channel, long *val) { struct amc6821_data *data = dev_get_drvdata(dev); switch (attr) { case hwmon_temp_input: case hwmon_temp_min: case hwmon_temp_max: case hwmon_temp_crit: return amc6821_temp_read_values(data->regmap, attr, channel, val); case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_crit_alarm: case hwmon_temp_fault: return amc6821_read_alarms(data->regmap, hwmon_temp, attr, channel, val); default: return -EOPNOTSUPP; } } static int amc6821_temp_write(struct device *dev, u32 attr, int channel, long val) { struct amc6821_data *data = dev_get_drvdata(dev); int reg; val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000); switch (attr) { case hwmon_temp_min: reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN; break; case hwmon_temp_max: reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX; break; case hwmon_temp_crit: reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT; break; default: return -EOPNOTSUPP; } return regmap_write(data->regmap, reg, val); } static int amc6821_pwm_read(struct device *dev, u32 attr, long *val) { struct amc6821_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; u32 regval; int err; switch (attr) { case hwmon_pwm_enable: err = regmap_read(regmap, AMC6821_REG_CONF1, ®val); if (err) return err; switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) { case 0: *val = 1; /* manual */ break; case AMC6821_CONF1_FDRC0: *val = 4; /* target rpm (fan1_target) controlled */ break; case AMC6821_CONF1_FDRC1: *val = 2; /* remote temp controlled */ break; default: *val = 3; /* max(local, remote) temp controlled */ break; } return 0; case hwmon_pwm_mode: err = regmap_read(regmap, AMC6821_REG_CONF2, ®val); if (err) return err; *val = !!(regval & AMC6821_CONF2_TACH_MODE); return 0; case hwmon_pwm_auto_channels_temp: err = regmap_read(regmap, AMC6821_REG_CONF1, ®val); if (err) return err; switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) { case 0: case AMC6821_CONF1_FDRC0: *val = 0; /* manual or target rpm controlled */ break; case AMC6821_CONF1_FDRC1: *val = 2; /* remote temp controlled */ break; default: *val = 3; /* max(local, remote) temp controlled */ break; } return 0; case hwmon_pwm_input: err = regmap_read(regmap, AMC6821_REG_DCY, ®val); if (err) return err; *val = regval; return 0; default: return -EOPNOTSUPP; } } static int amc6821_pwm_write(struct device *dev, u32 attr, long val) { struct amc6821_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; u32 mode; switch (attr) { case hwmon_pwm_enable: switch (val) { case 1: mode = 0; break; case 2: mode = AMC6821_CONF1_FDRC1; break; case 3: mode = AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1; break; case 4: mode = AMC6821_CONF1_FDRC0; break; default: return -EINVAL; } return regmap_update_bits(regmap, AMC6821_REG_CONF1, AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1, mode); case hwmon_pwm_mode: if (val < 0 || val > 1) return -EINVAL; return regmap_update_bits(regmap, AMC6821_REG_CONF2, AMC6821_CONF2_TACH_MODE, val ? AMC6821_CONF2_TACH_MODE : 0); break; case hwmon_pwm_input: if (val < 0 || val > 255) return -EINVAL; return regmap_write(regmap, AMC6821_REG_DCY, val); default: return -EOPNOTSUPP; } } static int amc6821_fan_read_rpm(struct regmap *regmap, u32 attr, long *val) { int reg, err; u8 regs[2]; u32 regval; switch (attr) { case hwmon_fan_input: reg = AMC6821_REG_TDATA_LOW; break; case hwmon_fan_min: reg = AMC6821_REG_TACH_LLIMITL; break; case hwmon_fan_max: reg = AMC6821_REG_TACH_HLIMITL; break; case hwmon_fan_target: reg = AMC6821_REG_TACH_SETTINGL; break; default: return -EOPNOTSUPP; } err = regmap_bulk_read(regmap, reg, regs, 2); if (err) return err; regval = (regs[1] << 8) | regs[0]; *val = regval ? 6000000 / regval : 0; return 0; } static int amc6821_fan_read(struct device *dev, u32 attr, long *val) { struct amc6821_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; u32 regval; int err; switch (attr) { case hwmon_fan_input: case hwmon_fan_min: case hwmon_fan_max: case hwmon_fan_target: return amc6821_fan_read_rpm(regmap, attr, val); case hwmon_fan_fault: return amc6821_read_alarms(regmap, hwmon_fan, attr, 0, val); case hwmon_fan_pulses: err = regmap_read(regmap, AMC6821_REG_CONF4, ®val); if (err) return err; *val = (regval & AMC6821_CONF4_PSPR) ? 4 : 2; return 0; default: return -EOPNOTSUPP; } } static int amc6821_fan_write(struct device *dev, u32 attr, long val) { struct amc6821_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; u8 regs[2]; int reg; if (attr == hwmon_fan_pulses) { if (val != 2 && val != 4) return -EINVAL; return regmap_update_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_PSPR, val == 4 ? AMC6821_CONF4_PSPR : 0); } if (val < 0) return -EINVAL; switch (attr) { case hwmon_fan_min: if (!val) /* no unlimited minimum speed */ return -EINVAL; reg = AMC6821_REG_TACH_LLIMITL; break; case hwmon_fan_max: reg = AMC6821_REG_TACH_HLIMITL; break; case hwmon_fan_target: if (!val) /* no unlimited target speed */ return -EINVAL; reg = AMC6821_REG_TACH_SETTINGL; break; default: return -EOPNOTSUPP; } val = val ? 6000000 / clamp_val(val, 1, 6000000) : 0; val = clamp_val(val, 0, 0xffff); regs[0] = val & 0xff; regs[1] = val >> 8; return regmap_bulk_write(data->regmap, reg, regs, 2); } static ssize_t temp_auto_point_temp_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct amc6821_data *data = dev_get_drvdata(dev); int ix = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; u8 temps[3]; int err; mutex_lock(&data->update_lock); err = amc6821_get_auto_point_temps(data->regmap, nr, temps); mutex_unlock(&data->update_lock); if (err) return err; return sysfs_emit(buf, "%d\n", temps[ix] * 1000); } static ssize_t pwm1_auto_point_pwm_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct amc6821_data *data = dev_get_drvdata(dev); int ix = to_sensor_dev_attr(devattr)->index; u32 val; int err; switch (ix) { case 0: val = 0; break; case 1: err = regmap_read(data->regmap, AMC6821_REG_DCY_LOW_TEMP, &val); if (err) return err; break; default: val = 255; break; } return sysfs_emit(buf, "%d\n", val); } /* * Set TEMP[0-4] (low temperature) and SLP[0-2] (slope) of local or remote * TEMP-FAN control register. * * Return 0 on success or negative error code. * * Channel 0: local, channel 1: remote */ static inline int set_slope_register(struct regmap *regmap, int channel, u8 *temps) { u8 regval = FIELD_PREP(AMC6821_TEMP_LIMIT_MASK, temps[1] / 4); u8 tmp, dpwm; int err, dt; u32 pwm; err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm); if (err) return err; dpwm = 255 - pwm; dt = temps[2] - temps[1]; for (tmp = 4; tmp > 0; tmp--) { if (dt * (32 >> tmp) >= dpwm) break; } regval |= FIELD_PREP(AMC6821_TEMP_SLOPE_MASK, tmp); return regmap_write(regmap, channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL, regval); } static ssize_t temp_auto_point_temp_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct amc6821_data *data = dev_get_drvdata(dev); int ix = to_sensor_dev_attr_2(attr)->index; int nr = to_sensor_dev_attr_2(attr)->nr; struct regmap *regmap = data->regmap; u8 temps[3], otemps[3]; long val; int ret; ret = kstrtol(buf, 10, &val); if (ret) return ret; mutex_lock(&data->update_lock); ret = amc6821_get_auto_point_temps(data->regmap, nr, temps); if (ret) goto unlock; switch (ix) { case 0: /* * Passive cooling temperature. Range limit against low limit * of both channels. */ ret = amc6821_get_auto_point_temps(data->regmap, 1 - nr, otemps); if (ret) goto unlock; val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 63000), 1000); val = clamp_val(val, 0, min(temps[1], otemps[1])); ret = regmap_write(regmap, AMC6821_REG_PSV_TEMP, val); break; case 1: /* * Low limit; must be between passive and high limit, * and not exceed 124. Step size is 4 degrees C. */ val = clamp_val(val, DIV_ROUND_UP(temps[0], 4) * 4000, 124000); temps[1] = DIV_ROUND_CLOSEST(val, 4000) * 4; val = temps[1] / 4; /* Auto-adjust high limit if necessary */ temps[2] = clamp_val(temps[2], temps[1] + 1, 255); ret = set_slope_register(regmap, nr, temps); break; case 2: /* high limit, must be higher than low limit */ val = clamp_val(val, (temps[1] + 1) * 1000, 255000); temps[2] = DIV_ROUND_CLOSEST(val, 1000); ret = set_slope_register(regmap, nr, temps); break; default: ret = -EINVAL; break; } unlock: mutex_unlock(&data->update_lock); return ret ? : count; } static ssize_t pwm1_auto_point_pwm_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct amc6821_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; int i, ret; u8 val; ret = kstrtou8(buf, 10, &val); if (ret) return ret; mutex_lock(&data->update_lock); ret = regmap_write(regmap, AMC6821_REG_DCY_LOW_TEMP, val); if (ret) goto unlock; for (i = 0; i < 2; i++) { u8 temps[3]; ret = amc6821_get_auto_point_temps(regmap, i, temps); if (ret) break; ret = set_slope_register(regmap, i, temps); if (ret) break; } unlock: mutex_unlock(&data->update_lock); return ret ? : count; } static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0); static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1); static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2); static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp, 0, 0); static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp, 0, 1); static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp, 0, 2); static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp, 1, 0); static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp, 1, 1); static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp, 1, 2); static struct attribute *amc6821_attrs[] = { &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr, &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr, &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr, &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr, &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr, &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr, &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(amc6821); static int amc6821_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { switch (type) { case hwmon_temp: return amc6821_temp_read(dev, attr, channel, val); case hwmon_fan: return amc6821_fan_read(dev, attr, val); case hwmon_pwm: return amc6821_pwm_read(dev, attr, val); default: return -EOPNOTSUPP; } } static int amc6821_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { switch (type) { case hwmon_temp: return amc6821_temp_write(dev, attr, channel, val); case hwmon_fan: return amc6821_fan_write(dev, attr, val); case hwmon_pwm: return amc6821_pwm_write(dev, attr, val); default: return -EOPNOTSUPP; } } static umode_t amc6821_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { switch (type) { case hwmon_temp: switch (attr) { case hwmon_temp_input: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_crit_alarm: case hwmon_temp_fault: return 0444; case hwmon_temp_min: case hwmon_temp_max: case hwmon_temp_crit: return 0644; default: return 0; } case hwmon_fan: switch (attr) { case hwmon_fan_input: case hwmon_fan_fault: return 0444; case hwmon_fan_pulses: case hwmon_fan_min: case hwmon_fan_max: case hwmon_fan_target: return 0644; default: return 0; } case hwmon_pwm: switch (attr) { case hwmon_pwm_mode: case hwmon_pwm_enable: case hwmon_pwm_input: return 0644; case hwmon_pwm_auto_channels_temp: return 0444; default: return 0; } default: return 0; } } static const struct hwmon_channel_info * const amc6821_info[] = { HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM, HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT), HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_TARGET | HWMON_F_PULSES | HWMON_F_FAULT), HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_MODE | HWMON_PWM_AUTO_CHANNELS_TEMP), NULL }; static const struct hwmon_ops amc6821_hwmon_ops = { .is_visible = amc6821_is_visible, .read = amc6821_read, .write = amc6821_write, }; static const struct hwmon_chip_info amc6821_chip_info = { .ops = &amc6821_hwmon_ops, .info = amc6821_info, }; /* Return 0 if detection is successful, -ENODEV otherwise */ static int amc6821_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int address = client->addr; int dev_id, comp_id; dev_dbg(&adapter->dev, "amc6821_detect called.\n"); if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_dbg(&adapter->dev, "amc6821: I2C bus doesn't support byte mode, " "skipping.\n"); return -ENODEV; } dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID); comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID); if (dev_id != 0x21 || comp_id != 0x49) { dev_dbg(&adapter->dev, "amc6821: detection failed at 0x%02x.\n", address); return -ENODEV; } /* * Bit 7 of the address register is ignored, so we can check the * ID registers again */ dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID); comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID); if (dev_id != 0x21 || comp_id != 0x49) { dev_dbg(&adapter->dev, "amc6821: detection failed at 0x%02x.\n", address); return -ENODEV; } dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address); strscpy(info->type, "amc6821", I2C_NAME_SIZE); return 0; } static int amc6821_init_client(struct amc6821_data *data) { struct regmap *regmap = data->regmap; int err; if (init) { err = regmap_set_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_MODE); if (err) return err; err = regmap_clear_bits(regmap, AMC6821_REG_CONF3, AMC6821_CONF3_THERM_FAN_EN); if (err) return err; err = regmap_clear_bits(regmap, AMC6821_REG_CONF2, AMC6821_CONF2_RTFIE | AMC6821_CONF2_LTOIE | AMC6821_CONF2_RTOIE); if (err) return err; err = regmap_update_bits(regmap, AMC6821_REG_CONF1, AMC6821_CONF1_THERMOVIE | AMC6821_CONF1_FANIE | AMC6821_CONF1_START | AMC6821_CONF1_PWMINV, AMC6821_CONF1_START | (pwminv ? AMC6821_CONF1_PWMINV : 0)); if (err) return err; } return 0; } static bool amc6821_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case AMC6821_REG_STAT1: case AMC6821_REG_STAT2: case AMC6821_REG_TEMP_LO: case AMC6821_REG_TDATA_LOW: case AMC6821_REG_LTEMP_HI: case AMC6821_REG_RTEMP_HI: case AMC6821_REG_TDATA_HI: return true; default: return false; } } static const struct regmap_config amc6821_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = AMC6821_REG_CONF3, .volatile_reg = amc6821_volatile_reg, .cache_type = REGCACHE_MAPLE, }; static int amc6821_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct amc6821_data *data; struct device *hwmon_dev; struct regmap *regmap; int err; data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL); if (!data) return -ENOMEM; regmap = devm_regmap_init_i2c(client, &amc6821_regmap_config); if (IS_ERR(regmap)) return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); data->regmap = regmap; err = amc6821_init_client(data); if (err) return err; hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &amc6821_chip_info, amc6821_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id amc6821_id[] = { { "amc6821", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, amc6821_id); static const struct of_device_id __maybe_unused amc6821_of_match[] = { { .compatible = "ti,amc6821", }, { } }; MODULE_DEVICE_TABLE(of, amc6821_of_match); static struct i2c_driver amc6821_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "amc6821", .of_match_table = of_match_ptr(amc6821_of_match), }, .probe = amc6821_probe, .id_table = amc6821_id, .detect = amc6821_detect, .address_list = normal_i2c, }; module_i2c_driver(amc6821_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("T. Mertelj "); MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");