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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware
0004  *      monitoring
0005  *
0006  * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
0007  *          Philip Edelbrock <phil@netroedge.com>
0008  * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
0009  * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable
0010  *              guidance from Jean Delvare
0011  *
0012  * Driver supports  Analog Devices      ADM9240
0013  *          Dallas Semiconductor    DS1780
0014  *          National Semiconductor  LM81
0015  *
0016  * ADM9240 is the reference, DS1780 and LM81 are register compatibles
0017  *
0018  * Voltage  Six inputs are scaled by chip, VID also reported
0019  * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris
0020  * Fans     2 fans, low speed alarm, automatic fan clock divider
0021  * Alarms   16-bit map of active alarms
0022  * Analog Out   0..1250 mV output
0023  *
0024  * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
0025  *
0026  * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
0027  *
0028  * LM81 extended temp reading not implemented
0029  */
0030 
0031 #include <linux/bits.h>
0032 #include <linux/init.h>
0033 #include <linux/module.h>
0034 #include <linux/slab.h>
0035 #include <linux/i2c.h>
0036 #include <linux/hwmon-sysfs.h>
0037 #include <linux/hwmon.h>
0038 #include <linux/hwmon-vid.h>
0039 #include <linux/err.h>
0040 #include <linux/mutex.h>
0041 #include <linux/regmap.h>
0042 
0043 /* Addresses to scan */
0044 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
0045                     I2C_CLIENT_END };
0046 
0047 enum chips { adm9240, ds1780, lm81 };
0048 
0049 /* ADM9240 registers */
0050 #define ADM9240_REG_MAN_ID      0x3e
0051 #define ADM9240_REG_DIE_REV     0x3f
0052 #define ADM9240_REG_CONFIG      0x40
0053 
0054 #define ADM9240_REG_IN(nr)      (0x20 + (nr))   /* 0..5 */
0055 #define ADM9240_REG_IN_MAX(nr)      (0x2b + (nr) * 2)
0056 #define ADM9240_REG_IN_MIN(nr)      (0x2c + (nr) * 2)
0057 #define ADM9240_REG_FAN(nr)     (0x28 + (nr))   /* 0..1 */
0058 #define ADM9240_REG_FAN_MIN(nr)     (0x3b + (nr))
0059 #define ADM9240_REG_INT(nr)     (0x41 + (nr))
0060 #define ADM9240_REG_INT_MASK(nr)    (0x43 + (nr))
0061 #define ADM9240_REG_TEMP        0x27
0062 #define ADM9240_REG_TEMP_MAX(nr)    (0x39 + (nr)) /* 0, 1 = high, hyst */
0063 #define ADM9240_REG_ANALOG_OUT      0x19
0064 #define ADM9240_REG_CHASSIS_CLEAR   0x46
0065 #define ADM9240_REG_VID_FAN_DIV     0x47
0066 #define ADM9240_REG_I2C_ADDR        0x48
0067 #define ADM9240_REG_VID4        0x49
0068 #define ADM9240_REG_TEMP_CONF       0x4b
0069 
0070 /* generalised scaling with integer rounding */
0071 static inline int SCALE(long val, int mul, int div)
0072 {
0073     if (val < 0)
0074         return (val * mul - div / 2) / div;
0075     else
0076         return (val * mul + div / 2) / div;
0077 }
0078 
0079 /* adm9240 internally scales voltage measurements */
0080 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
0081 
0082 static inline unsigned int IN_FROM_REG(u8 reg, int n)
0083 {
0084     return SCALE(reg, nom_mv[n], 192);
0085 }
0086 
0087 static inline u8 IN_TO_REG(unsigned long val, int n)
0088 {
0089     val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
0090     return SCALE(val, 192, nom_mv[n]);
0091 }
0092 
0093 /* temperature range: -40..125, 127 disables temperature alarm */
0094 static inline s8 TEMP_TO_REG(long val)
0095 {
0096     val = clamp_val(val, -40000, 127000);
0097     return SCALE(val, 1, 1000);
0098 }
0099 
0100 /* two fans, each with low fan speed limit */
0101 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
0102 {
0103     if (!reg) /* error */
0104         return -1;
0105 
0106     if (reg == 255)
0107         return 0;
0108 
0109     return SCALE(1350000, 1, reg * div);
0110 }
0111 
0112 /* analog out 0..1250mV */
0113 static inline u8 AOUT_TO_REG(unsigned long val)
0114 {
0115     val = clamp_val(val, 0, 1250);
0116     return SCALE(val, 255, 1250);
0117 }
0118 
0119 static inline unsigned int AOUT_FROM_REG(u8 reg)
0120 {
0121     return SCALE(reg, 1250, 255);
0122 }
0123 
0124 /* per client data */
0125 struct adm9240_data {
0126     struct device *dev;
0127     struct regmap *regmap;
0128     struct mutex update_lock;
0129 
0130     u8 fan_div[2];      /* rw   fan1_div, read-only accessor */
0131     u8 vrm;         /* --   vrm set on startup, no accessor */
0132 };
0133 
0134 /* write new fan div, callers must hold data->update_lock */
0135 static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
0136 {
0137     unsigned int reg, old, shift = (channel + 2) * 2;
0138     int err;
0139 
0140     err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &reg);
0141     if (err < 0)
0142         return err;
0143     old = (reg >> shift) & 3;
0144     reg &= ~(3 << shift);
0145     reg |= (fan_div << shift);
0146     err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
0147     if (err < 0)
0148         return err;
0149     dev_dbg(data->dev,
0150         "fan%d clock divider changed from %lu to %lu\n",
0151         channel + 1, BIT(old), BIT(fan_div));
0152 
0153     return 0;
0154 }
0155 
0156 /*
0157  * set fan speed low limit:
0158  *
0159  * - value is zero: disable fan speed low limit alarm
0160  *
0161  * - value is below fan speed measurement range: enable fan speed low
0162  *   limit alarm to be asserted while fan speed too slow to measure
0163  *
0164  * - otherwise: select fan clock divider to suit fan speed low limit,
0165  *   measurement code may adjust registers to ensure fan speed reading
0166  */
0167 static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
0168 {
0169     u8 new_div;
0170     u8 fan_min;
0171     int err;
0172 
0173     mutex_lock(&data->update_lock);
0174 
0175     if (!val) {
0176         fan_min = 255;
0177         new_div = data->fan_div[channel];
0178 
0179         dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
0180     } else if (val < 1350000 / (8 * 254)) {
0181         new_div = 3;
0182         fan_min = 254;
0183 
0184         dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
0185             channel + 1, FAN_FROM_REG(254, BIT(new_div)));
0186     } else {
0187         unsigned int new_min = 1350000 / val;
0188 
0189         new_div = 0;
0190         while (new_min > 192 && new_div < 3) {
0191             new_div++;
0192             new_min /= 2;
0193         }
0194         if (!new_min) /* keep > 0 */
0195             new_min++;
0196 
0197         fan_min = new_min;
0198 
0199         dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
0200             channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
0201     }
0202 
0203     if (new_div != data->fan_div[channel]) {
0204         data->fan_div[channel] = new_div;
0205         adm9240_write_fan_div(data, channel, new_div);
0206     }
0207     err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
0208 
0209     mutex_unlock(&data->update_lock);
0210 
0211     return err;
0212 }
0213 
0214 static ssize_t cpu0_vid_show(struct device *dev,
0215                  struct device_attribute *attr, char *buf)
0216 {
0217     struct adm9240_data *data = dev_get_drvdata(dev);
0218     unsigned int regval;
0219     int err;
0220     u8 vid;
0221 
0222     err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
0223     if (err < 0)
0224         return err;
0225     vid = regval & 0x0f;
0226     err = regmap_read(data->regmap, ADM9240_REG_VID4, &regval);
0227     if (err < 0)
0228         return err;
0229     vid |= (regval & 1) << 4;
0230     return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
0231 }
0232 static DEVICE_ATTR_RO(cpu0_vid);
0233 
0234 static ssize_t aout_output_show(struct device *dev,
0235                 struct device_attribute *attr, char *buf)
0236 {
0237     struct adm9240_data *data = dev_get_drvdata(dev);
0238     unsigned int regval;
0239     int err;
0240 
0241     err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, &regval);
0242     if (err)
0243         return err;
0244 
0245     return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
0246 }
0247 
0248 static ssize_t aout_output_store(struct device *dev,
0249                  struct device_attribute *attr,
0250                  const char *buf, size_t count)
0251 {
0252     struct adm9240_data *data = dev_get_drvdata(dev);
0253     long val;
0254     int err;
0255 
0256     err = kstrtol(buf, 10, &val);
0257     if (err)
0258         return err;
0259 
0260     err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
0261     return err < 0 ? err : count;
0262 }
0263 static DEVICE_ATTR_RW(aout_output);
0264 
0265 static struct attribute *adm9240_attrs[] = {
0266     &dev_attr_aout_output.attr,
0267     &dev_attr_cpu0_vid.attr,
0268     NULL
0269 };
0270 
0271 ATTRIBUTE_GROUPS(adm9240);
0272 
0273 /*** sensor chip detect and driver install ***/
0274 
0275 /* Return 0 if detection is successful, -ENODEV otherwise */
0276 static int adm9240_detect(struct i2c_client *new_client,
0277               struct i2c_board_info *info)
0278 {
0279     struct i2c_adapter *adapter = new_client->adapter;
0280     const char *name = "";
0281     int address = new_client->addr;
0282     u8 man_id, die_rev;
0283 
0284     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
0285         return -ENODEV;
0286 
0287     /* verify chip: reg address should match i2c address */
0288     if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
0289         return -ENODEV;
0290 
0291     /* check known chip manufacturer */
0292     man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
0293     if (man_id == 0x23)
0294         name = "adm9240";
0295     else if (man_id == 0xda)
0296         name = "ds1780";
0297     else if (man_id == 0x01)
0298         name = "lm81";
0299     else
0300         return -ENODEV;
0301 
0302     /* successful detect, print chip info */
0303     die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
0304     dev_info(&adapter->dev, "found %s revision %u\n",
0305          man_id == 0x23 ? "ADM9240" :
0306          man_id == 0xda ? "DS1780" : "LM81", die_rev);
0307 
0308     strscpy(info->type, name, I2C_NAME_SIZE);
0309 
0310     return 0;
0311 }
0312 
0313 static int adm9240_init_client(struct adm9240_data *data)
0314 {
0315     unsigned int regval;
0316     u8 conf, mode;
0317     int err;
0318 
0319     err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
0320     if (err < 0)
0321         return err;
0322     err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
0323     if (err < 0)
0324         return err;
0325     mode &= 3;
0326 
0327     data->vrm = vid_which_vrm(); /* need this to report vid as mV */
0328 
0329     dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
0330          data->vrm % 10);
0331 
0332     if (conf & 1) { /* measurement cycle running: report state */
0333 
0334         dev_info(data->dev, "status: config 0x%02x mode %u\n",
0335              conf, mode);
0336 
0337     } else { /* cold start: open limits before starting chip */
0338         int i;
0339 
0340         for (i = 0; i < 6; i++) {
0341             err = regmap_write(data->regmap,
0342                        ADM9240_REG_IN_MIN(i), 0);
0343             if (err < 0)
0344                 return err;
0345             err = regmap_write(data->regmap,
0346                        ADM9240_REG_IN_MAX(i), 255);
0347             if (err < 0)
0348                 return err;
0349         }
0350         for (i = 0; i < 2; i++) {
0351             err = regmap_write(data->regmap,
0352                        ADM9240_REG_FAN_MIN(i), 255);
0353             if (err < 0)
0354                 return err;
0355         }
0356         for (i = 0; i < 2; i++) {
0357             err = regmap_write(data->regmap,
0358                        ADM9240_REG_TEMP_MAX(i), 127);
0359             if (err < 0)
0360                 return err;
0361         }
0362 
0363         /* start measurement cycle */
0364         err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
0365         if (err < 0)
0366             return err;
0367 
0368         dev_info(data->dev,
0369              "cold start: config was 0x%02x mode %u\n", conf, mode);
0370     }
0371 
0372     /* read fan divs */
0373     err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
0374     if (err < 0)
0375         return err;
0376     data->fan_div[0] = (regval >> 4) & 3;
0377     data->fan_div[1] = (regval >> 6) & 3;
0378     return 0;
0379 }
0380 
0381 static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
0382 {
0383     struct adm9240_data *data = dev_get_drvdata(dev);
0384     u8 regs[2];
0385     int err;
0386 
0387     switch (attr) {
0388     case hwmon_chip_alarms:
0389         err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), &regs, 2);
0390         if (err < 0)
0391             return err;
0392         *val = regs[0] | regs[1] << 8;
0393         break;
0394     default:
0395         return -EOPNOTSUPP;
0396     }
0397     return 0;
0398 }
0399 
0400 static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
0401 {
0402     struct adm9240_data *data = dev_get_drvdata(dev);
0403     unsigned int regval;
0404     int err;
0405 
0406     switch (attr) {
0407     case hwmon_intrusion_alarm:
0408         err = regmap_read(data->regmap, ADM9240_REG_INT(1), &regval);
0409         if (err < 0)
0410             return err;
0411         *val = !!(regval & BIT(4));
0412         break;
0413     default:
0414         return -EOPNOTSUPP;
0415     }
0416     return 0;
0417 }
0418 
0419 static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
0420 {
0421     struct adm9240_data *data = dev_get_drvdata(dev);
0422     int err;
0423 
0424     switch (attr) {
0425     case hwmon_intrusion_alarm:
0426         if (val)
0427             return -EINVAL;
0428         err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
0429         if (err < 0)
0430             return err;
0431         dev_dbg(data->dev, "chassis intrusion latch cleared\n");
0432         break;
0433     default:
0434         return -EOPNOTSUPP;
0435     }
0436     return 0;
0437 }
0438 
0439 static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
0440 {
0441     struct adm9240_data *data = dev_get_drvdata(dev);
0442     unsigned int regval;
0443     int reg;
0444     int err;
0445 
0446     switch (attr) {
0447     case hwmon_in_input:
0448         reg = ADM9240_REG_IN(channel);
0449         break;
0450     case hwmon_in_min:
0451         reg = ADM9240_REG_IN_MIN(channel);
0452         break;
0453     case hwmon_in_max:
0454         reg = ADM9240_REG_IN_MAX(channel);
0455         break;
0456     case hwmon_in_alarm:
0457         if (channel < 4) {
0458             reg = ADM9240_REG_INT(0);
0459         } else {
0460             reg = ADM9240_REG_INT(1);
0461             channel -= 4;
0462         }
0463         err = regmap_read(data->regmap, reg, &regval);
0464         if (err < 0)
0465             return err;
0466         *val = !!(regval & BIT(channel));
0467         return 0;
0468     default:
0469         return -EOPNOTSUPP;
0470     }
0471     err = regmap_read(data->regmap, reg, &regval);
0472     if (err < 0)
0473         return err;
0474     *val = IN_FROM_REG(regval, channel);
0475     return 0;
0476 }
0477 
0478 static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
0479 {
0480     struct adm9240_data *data = dev_get_drvdata(dev);
0481     int reg;
0482 
0483     switch (attr) {
0484     case hwmon_in_min:
0485         reg = ADM9240_REG_IN_MIN(channel);
0486         break;
0487     case hwmon_in_max:
0488         reg = ADM9240_REG_IN_MAX(channel);
0489         break;
0490     default:
0491         return -EOPNOTSUPP;
0492     }
0493     return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
0494 }
0495 
0496 static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
0497 {
0498     struct adm9240_data *data = dev_get_drvdata(dev);
0499     unsigned int regval;
0500     int err;
0501 
0502     switch (attr) {
0503     case hwmon_fan_input:
0504         err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), &regval);
0505         if (err < 0)
0506             return err;
0507         if (regval == 255 && data->fan_div[channel] < 3) {
0508             /* adjust fan clock divider on overflow */
0509             err = adm9240_write_fan_div(data, channel,
0510                             ++data->fan_div[channel]);
0511             if (err)
0512                 return err;
0513         }
0514         *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
0515         break;
0516     case hwmon_fan_div:
0517         *val = BIT(data->fan_div[channel]);
0518         break;
0519     case hwmon_fan_min:
0520         err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), &regval);
0521         if (err < 0)
0522             return err;
0523         *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
0524         break;
0525     case hwmon_fan_alarm:
0526         err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
0527         if (err < 0)
0528             return err;
0529         *val = !!(regval & BIT(channel + 6));
0530         break;
0531     default:
0532         return -EOPNOTSUPP;
0533     }
0534     return 0;
0535 }
0536 
0537 static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
0538 {
0539     struct adm9240_data *data = dev_get_drvdata(dev);
0540     int err;
0541 
0542     switch (attr) {
0543     case hwmon_fan_min:
0544         err = adm9240_fan_min_write(data, channel, val);
0545         if (err < 0)
0546             return err;
0547         break;
0548     default:
0549         return -EOPNOTSUPP;
0550     }
0551     return 0;
0552 }
0553 
0554 static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
0555 {
0556     struct adm9240_data *data = dev_get_drvdata(dev);
0557     unsigned int regval;
0558     int err, temp;
0559 
0560     switch (attr) {
0561     case hwmon_temp_input:
0562         err = regmap_read(data->regmap, ADM9240_REG_TEMP, &regval);
0563         if (err < 0)
0564             return err;
0565         temp = regval << 1;
0566         err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, &regval);
0567         if (err < 0)
0568             return err;
0569         temp |= regval >> 7;
0570         *val = sign_extend32(temp, 8) * 500;
0571         break;
0572     case hwmon_temp_max:
0573         err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), &regval);
0574         if (err < 0)
0575             return err;
0576         *val = (s8)regval * 1000;
0577         break;
0578     case hwmon_temp_max_hyst:
0579         err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), &regval);
0580         if (err < 0)
0581             return err;
0582         *val = (s8)regval * 1000;
0583         break;
0584     case hwmon_temp_alarm:
0585         err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
0586         if (err < 0)
0587             return err;
0588         *val = !!(regval & BIT(4));
0589         break;
0590     default:
0591         return -EOPNOTSUPP;
0592     }
0593     return 0;
0594 }
0595 
0596 static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
0597 {
0598     struct adm9240_data *data = dev_get_drvdata(dev);
0599     int reg;
0600 
0601     switch (attr) {
0602     case hwmon_temp_max:
0603         reg = ADM9240_REG_TEMP_MAX(0);
0604         break;
0605     case hwmon_temp_max_hyst:
0606         reg = ADM9240_REG_TEMP_MAX(1);
0607         break;
0608     default:
0609         return -EOPNOTSUPP;
0610     }
0611     return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
0612 }
0613 
0614 static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
0615             int channel, long *val)
0616 {
0617     switch (type) {
0618     case hwmon_chip:
0619         return adm9240_chip_read(dev, attr, val);
0620     case hwmon_intrusion:
0621         return adm9240_intrusion_read(dev, attr, val);
0622     case hwmon_in:
0623         return adm9240_in_read(dev, attr, channel, val);
0624     case hwmon_fan:
0625         return adm9240_fan_read(dev, attr, channel, val);
0626     case hwmon_temp:
0627         return adm9240_temp_read(dev, attr, channel, val);
0628     default:
0629         return -EOPNOTSUPP;
0630     }
0631 }
0632 
0633 static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
0634              int channel, long val)
0635 {
0636     switch (type) {
0637     case hwmon_intrusion:
0638         return adm9240_intrusion_write(dev, attr, val);
0639     case hwmon_in:
0640         return adm9240_in_write(dev, attr, channel, val);
0641     case hwmon_fan:
0642         return adm9240_fan_write(dev, attr, channel, val);
0643     case hwmon_temp:
0644         return adm9240_temp_write(dev, attr, channel, val);
0645     default:
0646         return -EOPNOTSUPP;
0647     }
0648 }
0649 
0650 static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
0651                   u32 attr, int channel)
0652 {
0653     umode_t mode = 0;
0654 
0655     switch (type) {
0656     case hwmon_chip:
0657         switch (attr) {
0658         case hwmon_chip_alarms:
0659             mode = 0444;
0660             break;
0661         default:
0662             break;
0663         }
0664         break;
0665     case hwmon_intrusion:
0666         switch (attr) {
0667         case hwmon_intrusion_alarm:
0668             mode = 0644;
0669             break;
0670         default:
0671             break;
0672         }
0673         break;
0674     case hwmon_temp:
0675         switch (attr) {
0676         case hwmon_temp:
0677         case hwmon_temp_alarm:
0678             mode = 0444;
0679             break;
0680         case hwmon_temp_max:
0681         case hwmon_temp_max_hyst:
0682             mode = 0644;
0683             break;
0684         default:
0685             break;
0686         }
0687         break;
0688     case hwmon_fan:
0689         switch (attr) {
0690         case hwmon_fan_input:
0691         case hwmon_fan_div:
0692         case hwmon_fan_alarm:
0693             mode = 0444;
0694             break;
0695         case hwmon_fan_min:
0696             mode = 0644;
0697             break;
0698         default:
0699             break;
0700         }
0701         break;
0702     case hwmon_in:
0703         switch (attr) {
0704         case hwmon_in_input:
0705         case hwmon_in_alarm:
0706             mode = 0444;
0707             break;
0708         case hwmon_in_min:
0709         case hwmon_in_max:
0710             mode = 0644;
0711             break;
0712         default:
0713             break;
0714         }
0715         break;
0716     default:
0717         break;
0718     }
0719     return mode;
0720 }
0721 
0722 static const struct hwmon_ops adm9240_hwmon_ops = {
0723     .is_visible = adm9240_is_visible,
0724     .read = adm9240_read,
0725     .write = adm9240_write,
0726 };
0727 
0728 static const struct hwmon_channel_info *adm9240_info[] = {
0729     HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
0730     HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
0731     HWMON_CHANNEL_INFO(temp,
0732                HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
0733     HWMON_CHANNEL_INFO(in,
0734                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
0735                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
0736                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
0737                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
0738                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
0739                HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
0740     HWMON_CHANNEL_INFO(fan,
0741                HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
0742                HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
0743     NULL
0744 };
0745 
0746 static const struct hwmon_chip_info adm9240_chip_info = {
0747     .ops = &adm9240_hwmon_ops,
0748     .info = adm9240_info,
0749 };
0750 
0751 static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
0752 {
0753     switch (reg) {
0754     case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
0755     case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
0756     case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
0757     case ADM9240_REG_TEMP:
0758     case ADM9240_REG_TEMP_CONF:
0759     case ADM9240_REG_VID_FAN_DIV:
0760     case ADM9240_REG_VID4:
0761     case ADM9240_REG_ANALOG_OUT:
0762         return true;
0763     default:
0764         return false;
0765     }
0766 }
0767 
0768 static const struct regmap_config adm9240_regmap_config = {
0769     .reg_bits = 8,
0770     .val_bits = 8,
0771     .use_single_read = true,
0772     .use_single_write = true,
0773     .volatile_reg = adm9240_volatile_reg,
0774 };
0775 
0776 static int adm9240_probe(struct i2c_client *client)
0777 {
0778     struct device *dev = &client->dev;
0779     struct device *hwmon_dev;
0780     struct adm9240_data *data;
0781     int err;
0782 
0783     data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
0784     if (!data)
0785         return -ENOMEM;
0786 
0787     data->dev = dev;
0788     mutex_init(&data->update_lock);
0789     data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
0790     if (IS_ERR(data->regmap))
0791         return PTR_ERR(data->regmap);
0792 
0793     err = adm9240_init_client(data);
0794     if (err < 0)
0795         return err;
0796 
0797     hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
0798                              &adm9240_chip_info,
0799                              adm9240_groups);
0800     return PTR_ERR_OR_ZERO(hwmon_dev);
0801 }
0802 
0803 static const struct i2c_device_id adm9240_id[] = {
0804     { "adm9240", adm9240 },
0805     { "ds1780", ds1780 },
0806     { "lm81", lm81 },
0807     { }
0808 };
0809 MODULE_DEVICE_TABLE(i2c, adm9240_id);
0810 
0811 static struct i2c_driver adm9240_driver = {
0812     .class      = I2C_CLASS_HWMON,
0813     .driver = {
0814         .name   = "adm9240",
0815     },
0816     .probe_new  = adm9240_probe,
0817     .id_table   = adm9240_id,
0818     .detect     = adm9240_detect,
0819     .address_list   = normal_i2c,
0820 };
0821 
0822 module_i2c_driver(adm9240_driver);
0823 
0824 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
0825         "Grant Coady <gcoady.lk@gmail.com> and others");
0826 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
0827 MODULE_LICENSE("GPL");
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