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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
0004  *         monitoring
0005  * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
0006  *
0007  * Based on max6650.c:
0008  * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
0009  */
0010 
0011 #include <linux/kernel.h>   /* Needed for KERN_INFO */
0012 #include <linux/module.h>
0013 #include <linux/init.h>
0014 #include <linux/slab.h>
0015 #include <linux/jiffies.h>
0016 #include <linux/i2c.h>
0017 #include <linux/hwmon.h>
0018 #include <linux/hwmon-sysfs.h>
0019 #include <linux/err.h>
0020 #include <linux/mutex.h>
0021 
0022 /*
0023  * Addresses to scan.
0024  */
0025 
0026 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
0027     0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
0028 
0029 /*
0030  * Insmod parameters
0031  */
0032 
0033 static int pwminv;  /*Inverted PWM output. */
0034 module_param(pwminv, int, 0444);
0035 
0036 static int init = 1; /*Power-on initialization.*/
0037 module_param(init, int, 0444);
0038 
0039 enum chips { amc6821 };
0040 
0041 #define AMC6821_REG_DEV_ID 0x3D
0042 #define AMC6821_REG_COMP_ID 0x3E
0043 #define AMC6821_REG_CONF1 0x00
0044 #define AMC6821_REG_CONF2 0x01
0045 #define AMC6821_REG_CONF3 0x3F
0046 #define AMC6821_REG_CONF4 0x04
0047 #define AMC6821_REG_STAT1 0x02
0048 #define AMC6821_REG_STAT2 0x03
0049 #define AMC6821_REG_TDATA_LOW 0x08
0050 #define AMC6821_REG_TDATA_HI 0x09
0051 #define AMC6821_REG_LTEMP_HI 0x0A
0052 #define AMC6821_REG_RTEMP_HI 0x0B
0053 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
0054 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
0055 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
0056 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
0057 #define AMC6821_REG_LTEMP_CRIT 0x1B
0058 #define AMC6821_REG_RTEMP_CRIT 0x1D
0059 #define AMC6821_REG_PSV_TEMP 0x1C
0060 #define AMC6821_REG_DCY 0x22
0061 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
0062 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
0063 #define AMC6821_REG_DCY_LOW_TEMP 0x21
0064 
0065 #define AMC6821_REG_TACH_LLIMITL 0x10
0066 #define AMC6821_REG_TACH_LLIMITH 0x11
0067 #define AMC6821_REG_TACH_HLIMITL 0x12
0068 #define AMC6821_REG_TACH_HLIMITH 0x13
0069 
0070 #define AMC6821_CONF1_START 0x01
0071 #define AMC6821_CONF1_FAN_INT_EN 0x02
0072 #define AMC6821_CONF1_FANIE 0x04
0073 #define AMC6821_CONF1_PWMINV 0x08
0074 #define AMC6821_CONF1_FAN_FAULT_EN 0x10
0075 #define AMC6821_CONF1_FDRC0 0x20
0076 #define AMC6821_CONF1_FDRC1 0x40
0077 #define AMC6821_CONF1_THERMOVIE 0x80
0078 
0079 #define AMC6821_CONF2_PWM_EN 0x01
0080 #define AMC6821_CONF2_TACH_MODE 0x02
0081 #define AMC6821_CONF2_TACH_EN 0x04
0082 #define AMC6821_CONF2_RTFIE 0x08
0083 #define AMC6821_CONF2_LTOIE 0x10
0084 #define AMC6821_CONF2_RTOIE 0x20
0085 #define AMC6821_CONF2_PSVIE 0x40
0086 #define AMC6821_CONF2_RST 0x80
0087 
0088 #define AMC6821_CONF3_THERM_FAN_EN 0x80
0089 #define AMC6821_CONF3_REV_MASK 0x0F
0090 
0091 #define AMC6821_CONF4_OVREN 0x10
0092 #define AMC6821_CONF4_TACH_FAST 0x20
0093 #define AMC6821_CONF4_PSPR 0x40
0094 #define AMC6821_CONF4_MODE 0x80
0095 
0096 #define AMC6821_STAT1_RPM_ALARM 0x01
0097 #define AMC6821_STAT1_FANS 0x02
0098 #define AMC6821_STAT1_RTH 0x04
0099 #define AMC6821_STAT1_RTL 0x08
0100 #define AMC6821_STAT1_R_THERM 0x10
0101 #define AMC6821_STAT1_RTF 0x20
0102 #define AMC6821_STAT1_LTH 0x40
0103 #define AMC6821_STAT1_LTL 0x80
0104 
0105 #define AMC6821_STAT2_RTC 0x08
0106 #define AMC6821_STAT2_LTC 0x10
0107 #define AMC6821_STAT2_LPSV 0x20
0108 #define AMC6821_STAT2_L_THERM 0x40
0109 #define AMC6821_STAT2_THERM_IN 0x80
0110 
0111 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
0112     IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
0113     IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
0114     TEMP_IDX_LEN, };
0115 
0116 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
0117             AMC6821_REG_LTEMP_LIMIT_MIN,
0118             AMC6821_REG_LTEMP_LIMIT_MAX,
0119             AMC6821_REG_LTEMP_CRIT,
0120             AMC6821_REG_RTEMP_HI,
0121             AMC6821_REG_RTEMP_LIMIT_MIN,
0122             AMC6821_REG_RTEMP_LIMIT_MAX,
0123             AMC6821_REG_RTEMP_CRIT, };
0124 
0125 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
0126     FAN1_IDX_LEN, };
0127 
0128 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
0129             AMC6821_REG_TACH_LLIMITL,
0130             AMC6821_REG_TACH_HLIMITL, };
0131 
0132 
0133 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
0134             AMC6821_REG_TACH_LLIMITH,
0135             AMC6821_REG_TACH_HLIMITH, };
0136 
0137 /*
0138  * Client data (each client gets its own)
0139  */
0140 
0141 struct amc6821_data {
0142     struct i2c_client *client;
0143     struct mutex update_lock;
0144     bool valid; /* false until following fields are valid */
0145     unsigned long last_updated; /* in jiffies */
0146 
0147     /* register values */
0148     int temp[TEMP_IDX_LEN];
0149 
0150     u16 fan[FAN1_IDX_LEN];
0151     u8 fan1_div;
0152 
0153     u8 pwm1;
0154     u8 temp1_auto_point_temp[3];
0155     u8 temp2_auto_point_temp[3];
0156     u8 pwm1_auto_point_pwm[3];
0157     u8 pwm1_enable;
0158     u8 pwm1_auto_channels_temp;
0159 
0160     u8 stat1;
0161     u8 stat2;
0162 };
0163 
0164 static struct amc6821_data *amc6821_update_device(struct device *dev)
0165 {
0166     struct amc6821_data *data = dev_get_drvdata(dev);
0167     struct i2c_client *client = data->client;
0168     int timeout = HZ;
0169     u8 reg;
0170     int i;
0171 
0172     mutex_lock(&data->update_lock);
0173 
0174     if (time_after(jiffies, data->last_updated + timeout) ||
0175             !data->valid) {
0176 
0177         for (i = 0; i < TEMP_IDX_LEN; i++)
0178             data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
0179                 client, temp_reg[i]);
0180 
0181         data->stat1 = i2c_smbus_read_byte_data(client,
0182             AMC6821_REG_STAT1);
0183         data->stat2 = i2c_smbus_read_byte_data(client,
0184             AMC6821_REG_STAT2);
0185 
0186         data->pwm1 = i2c_smbus_read_byte_data(client,
0187             AMC6821_REG_DCY);
0188         for (i = 0; i < FAN1_IDX_LEN; i++) {
0189             data->fan[i] = i2c_smbus_read_byte_data(
0190                     client,
0191                     fan_reg_low[i]);
0192             data->fan[i] += i2c_smbus_read_byte_data(
0193                     client,
0194                     fan_reg_hi[i]) << 8;
0195         }
0196         data->fan1_div = i2c_smbus_read_byte_data(client,
0197             AMC6821_REG_CONF4);
0198         data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
0199 
0200         data->pwm1_auto_point_pwm[0] = 0;
0201         data->pwm1_auto_point_pwm[2] = 255;
0202         data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
0203             AMC6821_REG_DCY_LOW_TEMP);
0204 
0205         data->temp1_auto_point_temp[0] =
0206             i2c_smbus_read_byte_data(client,
0207                     AMC6821_REG_PSV_TEMP);
0208         data->temp2_auto_point_temp[0] =
0209                 data->temp1_auto_point_temp[0];
0210         reg = i2c_smbus_read_byte_data(client,
0211             AMC6821_REG_LTEMP_FAN_CTRL);
0212         data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
0213         reg &= 0x07;
0214         reg = 0x20 >> reg;
0215         if (reg > 0)
0216             data->temp1_auto_point_temp[2] =
0217                 data->temp1_auto_point_temp[1] +
0218                 (data->pwm1_auto_point_pwm[2] -
0219                 data->pwm1_auto_point_pwm[1]) / reg;
0220         else
0221             data->temp1_auto_point_temp[2] = 255;
0222 
0223         reg = i2c_smbus_read_byte_data(client,
0224             AMC6821_REG_RTEMP_FAN_CTRL);
0225         data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
0226         reg &= 0x07;
0227         reg = 0x20 >> reg;
0228         if (reg > 0)
0229             data->temp2_auto_point_temp[2] =
0230                 data->temp2_auto_point_temp[1] +
0231                 (data->pwm1_auto_point_pwm[2] -
0232                 data->pwm1_auto_point_pwm[1]) / reg;
0233         else
0234             data->temp2_auto_point_temp[2] = 255;
0235 
0236         reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
0237         reg = (reg >> 5) & 0x3;
0238         switch (reg) {
0239         case 0: /*open loop: software sets pwm1*/
0240             data->pwm1_auto_channels_temp = 0;
0241             data->pwm1_enable = 1;
0242             break;
0243         case 2: /*closed loop: remote T (temp2)*/
0244             data->pwm1_auto_channels_temp = 2;
0245             data->pwm1_enable = 2;
0246             break;
0247         case 3: /*closed loop: local and remote T (temp2)*/
0248             data->pwm1_auto_channels_temp = 3;
0249             data->pwm1_enable = 3;
0250             break;
0251         case 1: /*
0252              * semi-open loop: software sets rpm, chip controls
0253              * pwm1, currently not implemented
0254              */
0255             data->pwm1_auto_channels_temp = 0;
0256             data->pwm1_enable = 0;
0257             break;
0258         }
0259 
0260         data->last_updated = jiffies;
0261         data->valid = true;
0262     }
0263     mutex_unlock(&data->update_lock);
0264     return data;
0265 }
0266 
0267 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
0268              char *buf)
0269 {
0270     struct amc6821_data *data = amc6821_update_device(dev);
0271     int ix = to_sensor_dev_attr(devattr)->index;
0272 
0273     return sprintf(buf, "%d\n", data->temp[ix] * 1000);
0274 }
0275 
0276 static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
0277               const char *buf, size_t count)
0278 {
0279     struct amc6821_data *data = dev_get_drvdata(dev);
0280     struct i2c_client *client = data->client;
0281     int ix = to_sensor_dev_attr(attr)->index;
0282     long val;
0283 
0284     int ret = kstrtol(buf, 10, &val);
0285     if (ret)
0286         return ret;
0287     val = clamp_val(val / 1000, -128, 127);
0288 
0289     mutex_lock(&data->update_lock);
0290     data->temp[ix] = val;
0291     if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
0292         dev_err(&client->dev, "Register write error, aborting.\n");
0293         count = -EIO;
0294     }
0295     mutex_unlock(&data->update_lock);
0296     return count;
0297 }
0298 
0299 static ssize_t temp_alarm_show(struct device *dev,
0300                    struct device_attribute *devattr, char *buf)
0301 {
0302     struct amc6821_data *data = amc6821_update_device(dev);
0303     int ix = to_sensor_dev_attr(devattr)->index;
0304     u8 flag;
0305 
0306     switch (ix) {
0307     case IDX_TEMP1_MIN:
0308         flag = data->stat1 & AMC6821_STAT1_LTL;
0309         break;
0310     case IDX_TEMP1_MAX:
0311         flag = data->stat1 & AMC6821_STAT1_LTH;
0312         break;
0313     case IDX_TEMP1_CRIT:
0314         flag = data->stat2 & AMC6821_STAT2_LTC;
0315         break;
0316     case IDX_TEMP2_MIN:
0317         flag = data->stat1 & AMC6821_STAT1_RTL;
0318         break;
0319     case IDX_TEMP2_MAX:
0320         flag = data->stat1 & AMC6821_STAT1_RTH;
0321         break;
0322     case IDX_TEMP2_CRIT:
0323         flag = data->stat2 & AMC6821_STAT2_RTC;
0324         break;
0325     default:
0326         dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
0327         return -EINVAL;
0328     }
0329     if (flag)
0330         return sprintf(buf, "1");
0331     else
0332         return sprintf(buf, "0");
0333 }
0334 
0335 static ssize_t temp2_fault_show(struct device *dev,
0336                 struct device_attribute *devattr, char *buf)
0337 {
0338     struct amc6821_data *data = amc6821_update_device(dev);
0339     if (data->stat1 & AMC6821_STAT1_RTF)
0340         return sprintf(buf, "1");
0341     else
0342         return sprintf(buf, "0");
0343 }
0344 
0345 static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
0346              char *buf)
0347 {
0348     struct amc6821_data *data = amc6821_update_device(dev);
0349     return sprintf(buf, "%d\n", data->pwm1);
0350 }
0351 
0352 static ssize_t pwm1_store(struct device *dev,
0353               struct device_attribute *devattr, const char *buf,
0354               size_t count)
0355 {
0356     struct amc6821_data *data = dev_get_drvdata(dev);
0357     struct i2c_client *client = data->client;
0358     long val;
0359     int ret = kstrtol(buf, 10, &val);
0360     if (ret)
0361         return ret;
0362 
0363     mutex_lock(&data->update_lock);
0364     data->pwm1 = clamp_val(val , 0, 255);
0365     i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
0366     mutex_unlock(&data->update_lock);
0367     return count;
0368 }
0369 
0370 static ssize_t pwm1_enable_show(struct device *dev,
0371                 struct device_attribute *devattr, char *buf)
0372 {
0373     struct amc6821_data *data = amc6821_update_device(dev);
0374     return sprintf(buf, "%d\n", data->pwm1_enable);
0375 }
0376 
0377 static ssize_t pwm1_enable_store(struct device *dev,
0378                  struct device_attribute *attr,
0379                  const char *buf, size_t count)
0380 {
0381     struct amc6821_data *data = dev_get_drvdata(dev);
0382     struct i2c_client *client = data->client;
0383     long val;
0384     int config = kstrtol(buf, 10, &val);
0385     if (config)
0386         return config;
0387 
0388     mutex_lock(&data->update_lock);
0389     config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
0390     if (config < 0) {
0391             dev_err(&client->dev,
0392             "Error reading configuration register, aborting.\n");
0393             count = config;
0394             goto unlock;
0395     }
0396 
0397     switch (val) {
0398     case 1:
0399         config &= ~AMC6821_CONF1_FDRC0;
0400         config &= ~AMC6821_CONF1_FDRC1;
0401         break;
0402     case 2:
0403         config &= ~AMC6821_CONF1_FDRC0;
0404         config |= AMC6821_CONF1_FDRC1;
0405         break;
0406     case 3:
0407         config |= AMC6821_CONF1_FDRC0;
0408         config |= AMC6821_CONF1_FDRC1;
0409         break;
0410     default:
0411         count = -EINVAL;
0412         goto unlock;
0413     }
0414     if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
0415             dev_err(&client->dev,
0416             "Configuration register write error, aborting.\n");
0417             count = -EIO;
0418     }
0419 unlock:
0420     mutex_unlock(&data->update_lock);
0421     return count;
0422 }
0423 
0424 static ssize_t pwm1_auto_channels_temp_show(struct device *dev,
0425                         struct device_attribute *devattr,
0426                         char *buf)
0427 {
0428     struct amc6821_data *data = amc6821_update_device(dev);
0429     return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
0430 }
0431 
0432 static ssize_t temp_auto_point_temp_show(struct device *dev,
0433                      struct device_attribute *devattr,
0434                      char *buf)
0435 {
0436     int ix = to_sensor_dev_attr_2(devattr)->index;
0437     int nr = to_sensor_dev_attr_2(devattr)->nr;
0438     struct amc6821_data *data = amc6821_update_device(dev);
0439     switch (nr) {
0440     case 1:
0441         return sprintf(buf, "%d\n",
0442             data->temp1_auto_point_temp[ix] * 1000);
0443     case 2:
0444         return sprintf(buf, "%d\n",
0445             data->temp2_auto_point_temp[ix] * 1000);
0446     default:
0447         dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
0448         return -EINVAL;
0449     }
0450 }
0451 
0452 static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
0453                     struct device_attribute *devattr,
0454                     char *buf)
0455 {
0456     int ix = to_sensor_dev_attr(devattr)->index;
0457     struct amc6821_data *data = amc6821_update_device(dev);
0458     return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
0459 }
0460 
0461 static inline ssize_t set_slope_register(struct i2c_client *client,
0462         u8 reg,
0463         u8 dpwm,
0464         u8 *ptemp)
0465 {
0466     int dt;
0467     u8 tmp;
0468 
0469     dt = ptemp[2]-ptemp[1];
0470     for (tmp = 4; tmp > 0; tmp--) {
0471         if (dt * (0x20 >> tmp) >= dpwm)
0472             break;
0473     }
0474     tmp |= (ptemp[1] & 0x7C) << 1;
0475     if (i2c_smbus_write_byte_data(client,
0476             reg, tmp)) {
0477         dev_err(&client->dev, "Register write error, aborting.\n");
0478         return -EIO;
0479     }
0480     return 0;
0481 }
0482 
0483 static ssize_t temp_auto_point_temp_store(struct device *dev,
0484                       struct device_attribute *attr,
0485                       const char *buf, size_t count)
0486 {
0487     struct amc6821_data *data = amc6821_update_device(dev);
0488     struct i2c_client *client = data->client;
0489     int ix = to_sensor_dev_attr_2(attr)->index;
0490     int nr = to_sensor_dev_attr_2(attr)->nr;
0491     u8 *ptemp;
0492     u8 reg;
0493     int dpwm;
0494     long val;
0495     int ret = kstrtol(buf, 10, &val);
0496     if (ret)
0497         return ret;
0498 
0499     switch (nr) {
0500     case 1:
0501         ptemp = data->temp1_auto_point_temp;
0502         reg = AMC6821_REG_LTEMP_FAN_CTRL;
0503         break;
0504     case 2:
0505         ptemp = data->temp2_auto_point_temp;
0506         reg = AMC6821_REG_RTEMP_FAN_CTRL;
0507         break;
0508     default:
0509         dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
0510         return -EINVAL;
0511     }
0512 
0513     mutex_lock(&data->update_lock);
0514     data->valid = false;
0515 
0516     switch (ix) {
0517     case 0:
0518         ptemp[0] = clamp_val(val / 1000, 0,
0519                      data->temp1_auto_point_temp[1]);
0520         ptemp[0] = clamp_val(ptemp[0], 0,
0521                      data->temp2_auto_point_temp[1]);
0522         ptemp[0] = clamp_val(ptemp[0], 0, 63);
0523         if (i2c_smbus_write_byte_data(
0524                     client,
0525                     AMC6821_REG_PSV_TEMP,
0526                     ptemp[0])) {
0527                 dev_err(&client->dev,
0528                     "Register write error, aborting.\n");
0529                 count = -EIO;
0530         }
0531         goto EXIT;
0532     case 1:
0533         ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
0534         ptemp[1] &= 0x7C;
0535         ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
0536         break;
0537     case 2:
0538         ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
0539         break;
0540     default:
0541         dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
0542         count = -EINVAL;
0543         goto EXIT;
0544     }
0545     dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
0546     if (set_slope_register(client, reg, dpwm, ptemp))
0547         count = -EIO;
0548 
0549 EXIT:
0550     mutex_unlock(&data->update_lock);
0551     return count;
0552 }
0553 
0554 static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
0555                      struct device_attribute *attr,
0556                      const char *buf, size_t count)
0557 {
0558     struct amc6821_data *data = dev_get_drvdata(dev);
0559     struct i2c_client *client = data->client;
0560     int dpwm;
0561     long val;
0562     int ret = kstrtol(buf, 10, &val);
0563     if (ret)
0564         return ret;
0565 
0566     mutex_lock(&data->update_lock);
0567     data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
0568     if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
0569             data->pwm1_auto_point_pwm[1])) {
0570         dev_err(&client->dev, "Register write error, aborting.\n");
0571         count = -EIO;
0572         goto EXIT;
0573     }
0574     dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
0575     if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
0576             data->temp1_auto_point_temp)) {
0577         count = -EIO;
0578         goto EXIT;
0579     }
0580     if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
0581             data->temp2_auto_point_temp)) {
0582         count = -EIO;
0583         goto EXIT;
0584     }
0585 
0586 EXIT:
0587     data->valid = false;
0588     mutex_unlock(&data->update_lock);
0589     return count;
0590 }
0591 
0592 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
0593             char *buf)
0594 {
0595     struct amc6821_data *data = amc6821_update_device(dev);
0596     int ix = to_sensor_dev_attr(devattr)->index;
0597     if (0 == data->fan[ix])
0598         return sprintf(buf, "0");
0599     return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
0600 }
0601 
0602 static ssize_t fan1_fault_show(struct device *dev,
0603                    struct device_attribute *devattr, char *buf)
0604 {
0605     struct amc6821_data *data = amc6821_update_device(dev);
0606     if (data->stat1 & AMC6821_STAT1_FANS)
0607         return sprintf(buf, "1");
0608     else
0609         return sprintf(buf, "0");
0610 }
0611 
0612 static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
0613              const char *buf, size_t count)
0614 {
0615     struct amc6821_data *data = dev_get_drvdata(dev);
0616     struct i2c_client *client = data->client;
0617     long val;
0618     int ix = to_sensor_dev_attr(attr)->index;
0619     int ret = kstrtol(buf, 10, &val);
0620     if (ret)
0621         return ret;
0622     val = 1 > val ? 0xFFFF : 6000000/val;
0623 
0624     mutex_lock(&data->update_lock);
0625     data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
0626     if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
0627             data->fan[ix] & 0xFF)) {
0628         dev_err(&client->dev, "Register write error, aborting.\n");
0629         count = -EIO;
0630         goto EXIT;
0631     }
0632     if (i2c_smbus_write_byte_data(client,
0633             fan_reg_hi[ix], data->fan[ix] >> 8)) {
0634         dev_err(&client->dev, "Register write error, aborting.\n");
0635         count = -EIO;
0636     }
0637 EXIT:
0638     mutex_unlock(&data->update_lock);
0639     return count;
0640 }
0641 
0642 static ssize_t fan1_div_show(struct device *dev,
0643                  struct device_attribute *devattr, char *buf)
0644 {
0645     struct amc6821_data *data = amc6821_update_device(dev);
0646     return sprintf(buf, "%d\n", data->fan1_div);
0647 }
0648 
0649 static ssize_t fan1_div_store(struct device *dev,
0650                   struct device_attribute *attr, const char *buf,
0651                   size_t count)
0652 {
0653     struct amc6821_data *data = dev_get_drvdata(dev);
0654     struct i2c_client *client = data->client;
0655     long val;
0656     int config = kstrtol(buf, 10, &val);
0657     if (config)
0658         return config;
0659 
0660     mutex_lock(&data->update_lock);
0661     config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
0662     if (config < 0) {
0663         dev_err(&client->dev,
0664             "Error reading configuration register, aborting.\n");
0665         count = config;
0666         goto EXIT;
0667     }
0668     switch (val) {
0669     case 2:
0670         config &= ~AMC6821_CONF4_PSPR;
0671         data->fan1_div = 2;
0672         break;
0673     case 4:
0674         config |= AMC6821_CONF4_PSPR;
0675         data->fan1_div = 4;
0676         break;
0677     default:
0678         count = -EINVAL;
0679         goto EXIT;
0680     }
0681     if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
0682         dev_err(&client->dev,
0683             "Configuration register write error, aborting.\n");
0684         count = -EIO;
0685     }
0686 EXIT:
0687     mutex_unlock(&data->update_lock);
0688     return count;
0689 }
0690 
0691 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, IDX_TEMP1_INPUT);
0692 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, IDX_TEMP1_MIN);
0693 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, IDX_TEMP1_MAX);
0694 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, IDX_TEMP1_CRIT);
0695 static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_alarm, IDX_TEMP1_MIN);
0696 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_alarm, IDX_TEMP1_MAX);
0697 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_alarm, IDX_TEMP1_CRIT);
0698 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, IDX_TEMP2_INPUT);
0699 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, IDX_TEMP2_MIN);
0700 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, IDX_TEMP2_MAX);
0701 static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, IDX_TEMP2_CRIT);
0702 static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp2_fault, 0);
0703 static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_alarm, IDX_TEMP2_MIN);
0704 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_alarm, IDX_TEMP2_MAX);
0705 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_alarm, IDX_TEMP2_CRIT);
0706 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, IDX_FAN1_INPUT);
0707 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan, IDX_FAN1_MIN);
0708 static SENSOR_DEVICE_ATTR_RW(fan1_max, fan, IDX_FAN1_MAX);
0709 static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan1_fault, 0);
0710 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan1_div, 0);
0711 
0712 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm1, 0);
0713 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm1_enable, 0);
0714 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
0715 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
0716 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
0717 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_channels_temp, pwm1_auto_channels_temp,
0718                  0);
0719 static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
0720                    1, 0);
0721 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
0722                    1, 1);
0723 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
0724                    1, 2);
0725 
0726 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
0727                    2, 0);
0728 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
0729                    2, 1);
0730 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
0731                    2, 2);
0732 
0733 static struct attribute *amc6821_attrs[] = {
0734     &sensor_dev_attr_temp1_input.dev_attr.attr,
0735     &sensor_dev_attr_temp1_min.dev_attr.attr,
0736     &sensor_dev_attr_temp1_max.dev_attr.attr,
0737     &sensor_dev_attr_temp1_crit.dev_attr.attr,
0738     &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
0739     &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
0740     &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
0741     &sensor_dev_attr_temp2_input.dev_attr.attr,
0742     &sensor_dev_attr_temp2_min.dev_attr.attr,
0743     &sensor_dev_attr_temp2_max.dev_attr.attr,
0744     &sensor_dev_attr_temp2_crit.dev_attr.attr,
0745     &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
0746     &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
0747     &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
0748     &sensor_dev_attr_temp2_fault.dev_attr.attr,
0749     &sensor_dev_attr_fan1_input.dev_attr.attr,
0750     &sensor_dev_attr_fan1_min.dev_attr.attr,
0751     &sensor_dev_attr_fan1_max.dev_attr.attr,
0752     &sensor_dev_attr_fan1_fault.dev_attr.attr,
0753     &sensor_dev_attr_fan1_div.dev_attr.attr,
0754     &sensor_dev_attr_pwm1.dev_attr.attr,
0755     &sensor_dev_attr_pwm1_enable.dev_attr.attr,
0756     &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
0757     &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
0758     &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
0759     &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
0760     &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
0761     &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
0762     &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
0763     &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
0764     &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
0765     &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
0766     NULL
0767 };
0768 
0769 ATTRIBUTE_GROUPS(amc6821);
0770 
0771 /* Return 0 if detection is successful, -ENODEV otherwise */
0772 static int amc6821_detect(
0773         struct i2c_client *client,
0774         struct i2c_board_info *info)
0775 {
0776     struct i2c_adapter *adapter = client->adapter;
0777     int address = client->addr;
0778     int dev_id, comp_id;
0779 
0780     dev_dbg(&adapter->dev, "amc6821_detect called.\n");
0781 
0782     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
0783         dev_dbg(&adapter->dev,
0784             "amc6821: I2C bus doesn't support byte mode, "
0785             "skipping.\n");
0786         return -ENODEV;
0787     }
0788 
0789     dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
0790     comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
0791     if (dev_id != 0x21 || comp_id != 0x49) {
0792         dev_dbg(&adapter->dev,
0793             "amc6821: detection failed at 0x%02x.\n",
0794             address);
0795         return -ENODEV;
0796     }
0797 
0798     /*
0799      * Bit 7 of the address register is ignored, so we can check the
0800      * ID registers again
0801      */
0802     dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
0803     comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
0804     if (dev_id != 0x21 || comp_id != 0x49) {
0805         dev_dbg(&adapter->dev,
0806             "amc6821: detection failed at 0x%02x.\n",
0807             address);
0808         return -ENODEV;
0809     }
0810 
0811     dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
0812     strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
0813 
0814     return 0;
0815 }
0816 
0817 static int amc6821_init_client(struct i2c_client *client)
0818 {
0819     int config;
0820     int err = -EIO;
0821 
0822     if (init) {
0823         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
0824 
0825         if (config < 0) {
0826                 dev_err(&client->dev,
0827             "Error reading configuration register, aborting.\n");
0828                 return err;
0829         }
0830 
0831         config |= AMC6821_CONF4_MODE;
0832 
0833         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
0834                 config)) {
0835             dev_err(&client->dev,
0836             "Configuration register write error, aborting.\n");
0837             return err;
0838         }
0839 
0840         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
0841 
0842         if (config < 0) {
0843             dev_err(&client->dev,
0844             "Error reading configuration register, aborting.\n");
0845             return err;
0846         }
0847 
0848         dev_info(&client->dev, "Revision %d\n", config & 0x0f);
0849 
0850         config &= ~AMC6821_CONF3_THERM_FAN_EN;
0851 
0852         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
0853                 config)) {
0854             dev_err(&client->dev,
0855             "Configuration register write error, aborting.\n");
0856             return err;
0857         }
0858 
0859         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
0860 
0861         if (config < 0) {
0862             dev_err(&client->dev,
0863             "Error reading configuration register, aborting.\n");
0864             return err;
0865         }
0866 
0867         config &= ~AMC6821_CONF2_RTFIE;
0868         config &= ~AMC6821_CONF2_LTOIE;
0869         config &= ~AMC6821_CONF2_RTOIE;
0870         if (i2c_smbus_write_byte_data(client,
0871                 AMC6821_REG_CONF2, config)) {
0872             dev_err(&client->dev,
0873             "Configuration register write error, aborting.\n");
0874             return err;
0875         }
0876 
0877         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
0878 
0879         if (config < 0) {
0880             dev_err(&client->dev,
0881             "Error reading configuration register, aborting.\n");
0882             return err;
0883         }
0884 
0885         config &= ~AMC6821_CONF1_THERMOVIE;
0886         config &= ~AMC6821_CONF1_FANIE;
0887         config |= AMC6821_CONF1_START;
0888         if (pwminv)
0889             config |= AMC6821_CONF1_PWMINV;
0890         else
0891             config &= ~AMC6821_CONF1_PWMINV;
0892 
0893         if (i2c_smbus_write_byte_data(
0894                 client, AMC6821_REG_CONF1, config)) {
0895             dev_err(&client->dev,
0896             "Configuration register write error, aborting.\n");
0897             return err;
0898         }
0899     }
0900     return 0;
0901 }
0902 
0903 static int amc6821_probe(struct i2c_client *client)
0904 {
0905     struct device *dev = &client->dev;
0906     struct amc6821_data *data;
0907     struct device *hwmon_dev;
0908     int err;
0909 
0910     data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
0911     if (!data)
0912         return -ENOMEM;
0913 
0914     data->client = client;
0915     mutex_init(&data->update_lock);
0916 
0917     /*
0918      * Initialize the amc6821 chip
0919      */
0920     err = amc6821_init_client(client);
0921     if (err)
0922         return err;
0923 
0924     hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
0925                                data,
0926                                amc6821_groups);
0927     return PTR_ERR_OR_ZERO(hwmon_dev);
0928 }
0929 
0930 static const struct i2c_device_id amc6821_id[] = {
0931     { "amc6821", amc6821 },
0932     { }
0933 };
0934 
0935 MODULE_DEVICE_TABLE(i2c, amc6821_id);
0936 
0937 static struct i2c_driver amc6821_driver = {
0938     .class = I2C_CLASS_HWMON,
0939     .driver = {
0940         .name   = "amc6821",
0941     },
0942     .probe_new = amc6821_probe,
0943     .id_table = amc6821_id,
0944     .detect = amc6821_detect,
0945     .address_list = normal_i2c,
0946 };
0947 
0948 module_i2c_driver(amc6821_driver);
0949 
0950 MODULE_LICENSE("GPL");
0951 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
0952 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
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