/* * nct7904.c - driver for Nuvoton NCT7904D. * * Copyright (c) 2015 Kontron * Author: Vadim V. Vlasov * * 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. */ #include #include #include #include #include #include #include #define VENDOR_ID_REG 0x7A /* Any bank */ #define NUVOTON_ID 0x50 #define CHIP_ID_REG 0x7B /* Any bank */ #define NCT7904_ID 0xC5 #define DEVICE_ID_REG 0x7C /* Any bank */ #define BANK_SEL_REG 0xFF #define BANK_0 0x00 #define BANK_1 0x01 #define BANK_2 0x02 #define BANK_3 0x03 #define BANK_4 0x04 #define BANK_MAX 0x04 #define FANIN_MAX 12 /* Counted from 1 */ #define VSEN_MAX 21 /* VSEN1..14, 3VDD, VBAT, V3VSB, LTD (not a voltage), VSEN17..19 */ #define FANCTL_MAX 4 /* Counted from 1 */ #define TCPU_MAX 8 /* Counted from 1 */ #define TEMP_MAX 4 /* Counted from 1 */ #define VT_ADC_CTRL0_REG 0x20 /* Bank 0 */ #define VT_ADC_CTRL1_REG 0x21 /* Bank 0 */ #define VT_ADC_CTRL2_REG 0x22 /* Bank 0 */ #define FANIN_CTRL0_REG 0x24 #define FANIN_CTRL1_REG 0x25 #define DTS_T_CTRL0_REG 0x26 #define DTS_T_CTRL1_REG 0x27 #define VT_ADC_MD_REG 0x2E #define VSEN1_HV_REG 0x40 /* Bank 0; 2 regs (HV/LV) per sensor */ #define TEMP_CH1_HV_REG 0x42 /* Bank 0; same as VSEN2_HV */ #define LTD_HV_REG 0x62 /* Bank 0; 2 regs in VSEN range */ #define FANIN1_HV_REG 0x80 /* Bank 0; 2 regs (HV/LV) per sensor */ #define T_CPU1_HV_REG 0xA0 /* Bank 0; 2 regs (HV/LV) per sensor */ #define PRTS_REG 0x03 /* Bank 2 */ #define FANCTL1_FMR_REG 0x00 /* Bank 3; 1 reg per channel */ #define FANCTL1_OUT_REG 0x10 /* Bank 3; 1 reg per channel */ static const unsigned short normal_i2c[] = { 0x2d, 0x2e, I2C_CLIENT_END }; struct nct7904_data { struct i2c_client *client; struct mutex bank_lock; int bank_sel; u32 fanin_mask; u32 vsen_mask; u32 tcpu_mask; u8 fan_mode[FANCTL_MAX]; }; /* Access functions */ static int nct7904_bank_lock(struct nct7904_data *data, unsigned bank) { int ret; mutex_lock(&data->bank_lock); if (data->bank_sel == bank) return 0; ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank); if (ret == 0) data->bank_sel = bank; else data->bank_sel = -1; return ret; } static inline void nct7904_bank_release(struct nct7904_data *data) { mutex_unlock(&data->bank_lock); } /* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */ static int nct7904_read_reg(struct nct7904_data *data, unsigned bank, unsigned reg) { struct i2c_client *client = data->client; int ret; ret = nct7904_bank_lock(data, bank); if (ret == 0) ret = i2c_smbus_read_byte_data(client, reg); nct7904_bank_release(data); return ret; } /* * Read 2-byte register. Returns register in big-endian format or * -ERRNO on error. */ static int nct7904_read_reg16(struct nct7904_data *data, unsigned bank, unsigned reg) { struct i2c_client *client = data->client; int ret, hi; ret = nct7904_bank_lock(data, bank); if (ret == 0) { ret = i2c_smbus_read_byte_data(client, reg); if (ret >= 0) { hi = ret; ret = i2c_smbus_read_byte_data(client, reg + 1); if (ret >= 0) ret |= hi << 8; } } nct7904_bank_release(data); return ret; } /* Write 1-byte register. Returns 0 or -ERRNO on error. */ static int nct7904_write_reg(struct nct7904_data *data, unsigned bank, unsigned reg, u8 val) { struct i2c_client *client = data->client; int ret; ret = nct7904_bank_lock(data, bank); if (ret == 0) ret = i2c_smbus_write_byte_data(client, reg, val); nct7904_bank_release(data); return ret; } /* FANIN ATTR */ static ssize_t show_fan(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); int ret; unsigned cnt, rpm; ret = nct7904_read_reg16(data, BANK_0, FANIN1_HV_REG + index * 2); if (ret < 0) return ret; cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f); if (cnt == 0x1fff) rpm = 0; else rpm = 1350000 / cnt; return sprintf(buf, "%u\n", rpm); } static umode_t nct7904_fanin_is_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7904_data *data = dev_get_drvdata(dev); if (data->fanin_mask & (1 << n)) return a->mode; return 0; } static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan, NULL, 4); static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan, NULL, 5); static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan, NULL, 6); static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan, NULL, 7); static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, show_fan, NULL, 8); static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, show_fan, NULL, 9); static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, show_fan, NULL, 10); static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, show_fan, NULL, 11); static struct attribute *nct7904_fanin_attrs[] = { &sensor_dev_attr_fan1_input.dev_attr.attr, &sensor_dev_attr_fan2_input.dev_attr.attr, &sensor_dev_attr_fan3_input.dev_attr.attr, &sensor_dev_attr_fan4_input.dev_attr.attr, &sensor_dev_attr_fan5_input.dev_attr.attr, &sensor_dev_attr_fan6_input.dev_attr.attr, &sensor_dev_attr_fan7_input.dev_attr.attr, &sensor_dev_attr_fan8_input.dev_attr.attr, &sensor_dev_attr_fan9_input.dev_attr.attr, &sensor_dev_attr_fan10_input.dev_attr.attr, &sensor_dev_attr_fan11_input.dev_attr.attr, &sensor_dev_attr_fan12_input.dev_attr.attr, NULL }; static const struct attribute_group nct7904_fanin_group = { .attrs = nct7904_fanin_attrs, .is_visible = nct7904_fanin_is_visible, }; /* VSEN ATTR */ static ssize_t show_voltage(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); int ret; int volt; ret = nct7904_read_reg16(data, BANK_0, VSEN1_HV_REG + index * 2); if (ret < 0) return ret; volt = ((ret & 0xff00) >> 5) | (ret & 0x7); if (index < 14) volt *= 2; /* 0.002V scale */ else volt *= 6; /* 0.006V scale */ return sprintf(buf, "%d\n", volt); } static ssize_t show_ltemp(struct device *dev, struct device_attribute *devattr, char *buf) { struct nct7904_data *data = dev_get_drvdata(dev); int ret; int temp; ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG); if (ret < 0) return ret; temp = ((ret & 0xff00) >> 5) | (ret & 0x7); temp = sign_extend32(temp, 10) * 125; return sprintf(buf, "%d\n", temp); } static umode_t nct7904_vsen_is_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7904_data *data = dev_get_drvdata(dev); if (data->vsen_mask & (1 << n)) return a->mode; return 0; } static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_voltage, NULL, 0); static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_voltage, NULL, 1); static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_voltage, NULL, 2); static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_voltage, NULL, 3); static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_voltage, NULL, 4); static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_voltage, NULL, 5); static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, show_voltage, NULL, 6); static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, show_voltage, NULL, 7); static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, show_voltage, NULL, 8); static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, show_voltage, NULL, 9); static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, show_voltage, NULL, 10); static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, show_voltage, NULL, 11); static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, show_voltage, NULL, 12); static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, show_voltage, NULL, 13); /* * Next 3 voltage sensors have specific names in the Nuvoton doc * (3VDD, VBAT, 3VSB) but we use vacant numbers for them. */ static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, show_voltage, NULL, 14); static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, show_voltage, NULL, 15); static SENSOR_DEVICE_ATTR(in20_input, S_IRUGO, show_voltage, NULL, 16); /* This is not a voltage, but a local temperature sensor. */ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_ltemp, NULL, 0); static SENSOR_DEVICE_ATTR(in17_input, S_IRUGO, show_voltage, NULL, 18); static SENSOR_DEVICE_ATTR(in18_input, S_IRUGO, show_voltage, NULL, 19); static SENSOR_DEVICE_ATTR(in19_input, S_IRUGO, show_voltage, NULL, 20); static struct attribute *nct7904_vsen_attrs[] = { &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in7_input.dev_attr.attr, &sensor_dev_attr_in8_input.dev_attr.attr, &sensor_dev_attr_in9_input.dev_attr.attr, &sensor_dev_attr_in10_input.dev_attr.attr, &sensor_dev_attr_in11_input.dev_attr.attr, &sensor_dev_attr_in12_input.dev_attr.attr, &sensor_dev_attr_in13_input.dev_attr.attr, &sensor_dev_attr_in14_input.dev_attr.attr, &sensor_dev_attr_in15_input.dev_attr.attr, &sensor_dev_attr_in16_input.dev_attr.attr, &sensor_dev_attr_in20_input.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_in17_input.dev_attr.attr, &sensor_dev_attr_in18_input.dev_attr.attr, &sensor_dev_attr_in19_input.dev_attr.attr, NULL }; static const struct attribute_group nct7904_vsen_group = { .attrs = nct7904_vsen_attrs, .is_visible = nct7904_vsen_is_visible, }; /* CPU_TEMP ATTR */ static ssize_t show_tcpu(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); int ret; int temp; ret = nct7904_read_reg16(data, BANK_0, T_CPU1_HV_REG + index * 2); if (ret < 0) return ret; temp = ((ret & 0xff00) >> 5) | (ret & 0x7); temp = sign_extend32(temp, 10) * 125; return sprintf(buf, "%d\n", temp); } static umode_t nct7904_tcpu_is_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7904_data *data = dev_get_drvdata(dev); if (data->tcpu_mask & (1 << n)) return a->mode; return 0; } /* "temp1_input" reserved for local temp */ static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_tcpu, NULL, 0); static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_tcpu, NULL, 1); static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_tcpu, NULL, 2); static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_tcpu, NULL, 3); static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_tcpu, NULL, 4); static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_tcpu, NULL, 5); static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_tcpu, NULL, 6); static SENSOR_DEVICE_ATTR(temp9_input, S_IRUGO, show_tcpu, NULL, 7); static struct attribute *nct7904_tcpu_attrs[] = { &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp4_input.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, &sensor_dev_attr_temp6_input.dev_attr.attr, &sensor_dev_attr_temp7_input.dev_attr.attr, &sensor_dev_attr_temp8_input.dev_attr.attr, &sensor_dev_attr_temp9_input.dev_attr.attr, NULL }; static const struct attribute_group nct7904_tcpu_group = { .attrs = nct7904_tcpu_attrs, .is_visible = nct7904_tcpu_is_visible, }; /* PWM ATTR */ static ssize_t store_pwm(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); unsigned long val; int ret; if (kstrtoul(buf, 10, &val) < 0) return -EINVAL; if (val > 255) return -EINVAL; ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + index, val); return ret ? ret : count; } static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); int val; val = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + index); if (val < 0) return val; return sprintf(buf, "%d\n", val); } static ssize_t store_enable(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); unsigned long val; int ret; if (kstrtoul(buf, 10, &val) < 0) return -EINVAL; if (val < 1 || val > 2 || (val == 2 && !data->fan_mode[index])) return -EINVAL; ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + index, val == 2 ? data->fan_mode[index] : 0); return ret ? ret : count; } /* Return 1 for manual mode or 2 for SmartFan mode */ static ssize_t show_enable(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct nct7904_data *data = dev_get_drvdata(dev); int val; val = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + index); if (val < 0) return val; return sprintf(buf, "%d\n", val ? 2 : 1); } /* 2 attributes per channel: pwm and mode */ static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0); static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_enable, store_enable, 0); static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 1); static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, show_enable, store_enable, 1); static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 2); static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, show_enable, store_enable, 2); static SENSOR_DEVICE_ATTR(pwm4, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 3); static SENSOR_DEVICE_ATTR(pwm4_enable, S_IRUGO | S_IWUSR, show_enable, store_enable, 3); static struct attribute *nct7904_fanctl_attrs[] = { &sensor_dev_attr_pwm1.dev_attr.attr, &sensor_dev_attr_pwm1_enable.dev_attr.attr, &sensor_dev_attr_pwm2.dev_attr.attr, &sensor_dev_attr_pwm2_enable.dev_attr.attr, &sensor_dev_attr_pwm3.dev_attr.attr, &sensor_dev_attr_pwm3_enable.dev_attr.attr, &sensor_dev_attr_pwm4.dev_attr.attr, &sensor_dev_attr_pwm4_enable.dev_attr.attr, NULL }; static const struct attribute_group nct7904_fanctl_group = { .attrs = nct7904_fanctl_attrs, }; static const struct attribute_group *nct7904_groups[] = { &nct7904_fanin_group, &nct7904_vsen_group, &nct7904_tcpu_group, &nct7904_fanctl_group, NULL }; /* Return 0 if detection is successful, -ENODEV otherwise */ static int nct7904_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) return -ENODEV; /* Determine the chip type. */ if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID || i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID || (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 || (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00) return -ENODEV; strlcpy(info->type, "nct7904", I2C_NAME_SIZE); return 0; } static int nct7904_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct nct7904_data *data; struct device *hwmon_dev; struct device *dev = &client->dev; int ret, i; u32 mask; data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; mutex_init(&data->bank_lock); data->bank_sel = -1; /* Setup sensor groups. */ /* FANIN attributes */ ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG); if (ret < 0) return ret; data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8); /* * VSEN attributes * * Note: voltage sensors overlap with external temperature * sensors. So, if we ever decide to support the latter * we will have to adjust 'vsen_mask' accordingly. */ mask = 0; ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG); if (ret >= 0) mask = (ret >> 8) | ((ret & 0xff) << 8); ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG); if (ret >= 0) mask |= (ret << 16); data->vsen_mask = mask; /* CPU_TEMP attributes */ ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG); if (ret < 0) return ret; data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4); for (i = 0; i < FANCTL_MAX; i++) { ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i); if (ret < 0) return ret; data->fan_mode[i] = ret; } hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, nct7904_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id nct7904_id[] = { {"nct7904", 0}, {} }; MODULE_DEVICE_TABLE(i2c, nct7904_id); static struct i2c_driver nct7904_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "nct7904", }, .probe = nct7904_probe, .id_table = nct7904_id, .detect = nct7904_detect, .address_list = normal_i2c, }; module_i2c_driver(nct7904_driver); MODULE_AUTHOR("Vadim V. Vlasov "); MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904"); MODULE_LICENSE("GPL");