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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /***************************************************************************
0003  *   Copyright (C) 2011-2012 Hans de Goede <hdegoede@redhat.com>           *
0004  *                                                                         *
0005  ***************************************************************************/
0006 
0007 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0008 
0009 #include <linux/module.h>
0010 #include <linux/mod_devicetable.h>
0011 #include <linux/init.h>
0012 #include <linux/slab.h>
0013 #include <linux/jiffies.h>
0014 #include <linux/platform_device.h>
0015 #include <linux/hwmon.h>
0016 #include <linux/hwmon-sysfs.h>
0017 #include <linux/err.h>
0018 #include <linux/mutex.h>
0019 #include "sch56xx-common.h"
0020 
0021 #define DRVNAME "sch5636"
0022 #define DEVNAME "theseus" /* We only support one model for now */
0023 
0024 #define SCH5636_REG_FUJITSU_ID      0x780
0025 #define SCH5636_REG_FUJITSU_REV     0x783
0026 
0027 #define SCH5636_NO_INS          5
0028 #define SCH5636_NO_TEMPS        16
0029 #define SCH5636_NO_FANS         8
0030 
0031 static const u16 SCH5636_REG_IN_VAL[SCH5636_NO_INS] = {
0032     0x22, 0x23, 0x24, 0x25, 0x189 };
0033 static const u16 SCH5636_REG_IN_FACTORS[SCH5636_NO_INS] = {
0034     4400, 1500, 4000, 4400, 16000 };
0035 static const char * const SCH5636_IN_LABELS[SCH5636_NO_INS] = {
0036     "3.3V", "VREF", "VBAT", "3.3AUX", "12V" };
0037 
0038 static const u16 SCH5636_REG_TEMP_VAL[SCH5636_NO_TEMPS] = {
0039     0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181,
0040     0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C };
0041 #define SCH5636_REG_TEMP_CTRL(i)    (0x790 + (i))
0042 #define SCH5636_TEMP_WORKING        0x01
0043 #define SCH5636_TEMP_ALARM      0x02
0044 #define SCH5636_TEMP_DEACTIVATED    0x80
0045 
0046 static const u16 SCH5636_REG_FAN_VAL[SCH5636_NO_FANS] = {
0047     0x2C, 0x2E, 0x30, 0x32, 0x62, 0x64, 0x66, 0x68 };
0048 #define SCH5636_REG_FAN_CTRL(i)     (0x880 + (i))
0049 /* FAULT in datasheet, but acts as an alarm */
0050 #define SCH5636_FAN_ALARM       0x04
0051 #define SCH5636_FAN_NOT_PRESENT     0x08
0052 #define SCH5636_FAN_DEACTIVATED     0x80
0053 
0054 
0055 struct sch5636_data {
0056     unsigned short addr;
0057     struct device *hwmon_dev;
0058 
0059     struct mutex update_lock;
0060     bool valid;         /* true if following fields are valid */
0061     unsigned long last_updated; /* In jiffies */
0062     u8 in[SCH5636_NO_INS];
0063     u8 temp_val[SCH5636_NO_TEMPS];
0064     u8 temp_ctrl[SCH5636_NO_TEMPS];
0065     u16 fan_val[SCH5636_NO_FANS];
0066     u8 fan_ctrl[SCH5636_NO_FANS];
0067 };
0068 
0069 static struct sch5636_data *sch5636_update_device(struct device *dev)
0070 {
0071     struct sch5636_data *data = dev_get_drvdata(dev);
0072     struct sch5636_data *ret = data;
0073     int i, val;
0074 
0075     mutex_lock(&data->update_lock);
0076 
0077     /* Cache the values for 1 second */
0078     if (data->valid && !time_after(jiffies, data->last_updated + HZ))
0079         goto abort;
0080 
0081     for (i = 0; i < SCH5636_NO_INS; i++) {
0082         val = sch56xx_read_virtual_reg(data->addr,
0083                            SCH5636_REG_IN_VAL[i]);
0084         if (unlikely(val < 0)) {
0085             ret = ERR_PTR(val);
0086             goto abort;
0087         }
0088         data->in[i] = val;
0089     }
0090 
0091     for (i = 0; i < SCH5636_NO_TEMPS; i++) {
0092         if (data->temp_ctrl[i] & SCH5636_TEMP_DEACTIVATED)
0093             continue;
0094 
0095         val = sch56xx_read_virtual_reg(data->addr,
0096                            SCH5636_REG_TEMP_VAL[i]);
0097         if (unlikely(val < 0)) {
0098             ret = ERR_PTR(val);
0099             goto abort;
0100         }
0101         data->temp_val[i] = val;
0102 
0103         val = sch56xx_read_virtual_reg(data->addr,
0104                            SCH5636_REG_TEMP_CTRL(i));
0105         if (unlikely(val < 0)) {
0106             ret = ERR_PTR(val);
0107             goto abort;
0108         }
0109         data->temp_ctrl[i] = val;
0110         /* Alarms need to be explicitly write-cleared */
0111         if (val & SCH5636_TEMP_ALARM) {
0112             sch56xx_write_virtual_reg(data->addr,
0113                         SCH5636_REG_TEMP_CTRL(i), val);
0114         }
0115     }
0116 
0117     for (i = 0; i < SCH5636_NO_FANS; i++) {
0118         if (data->fan_ctrl[i] & SCH5636_FAN_DEACTIVATED)
0119             continue;
0120 
0121         val = sch56xx_read_virtual_reg16(data->addr,
0122                          SCH5636_REG_FAN_VAL[i]);
0123         if (unlikely(val < 0)) {
0124             ret = ERR_PTR(val);
0125             goto abort;
0126         }
0127         data->fan_val[i] = val;
0128 
0129         val = sch56xx_read_virtual_reg(data->addr,
0130                            SCH5636_REG_FAN_CTRL(i));
0131         if (unlikely(val < 0)) {
0132             ret = ERR_PTR(val);
0133             goto abort;
0134         }
0135         data->fan_ctrl[i] = val;
0136         /* Alarms need to be explicitly write-cleared */
0137         if (val & SCH5636_FAN_ALARM) {
0138             sch56xx_write_virtual_reg(data->addr,
0139                         SCH5636_REG_FAN_CTRL(i), val);
0140         }
0141     }
0142 
0143     data->last_updated = jiffies;
0144     data->valid = true;
0145 abort:
0146     mutex_unlock(&data->update_lock);
0147     return ret;
0148 }
0149 
0150 static int reg_to_rpm(u16 reg)
0151 {
0152     if (reg == 0)
0153         return -EIO;
0154     if (reg == 0xffff)
0155         return 0;
0156 
0157     return 5400540 / reg;
0158 }
0159 
0160 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
0161              char *buf)
0162 {
0163     return sysfs_emit(buf, "%s\n", DEVNAME);
0164 }
0165 
0166 static ssize_t in_value_show(struct device *dev,
0167                  struct device_attribute *devattr, char *buf)
0168 {
0169     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0170     struct sch5636_data *data = sch5636_update_device(dev);
0171     int val;
0172 
0173     if (IS_ERR(data))
0174         return PTR_ERR(data);
0175 
0176     val = DIV_ROUND_CLOSEST(
0177         data->in[attr->index] * SCH5636_REG_IN_FACTORS[attr->index],
0178         255);
0179     return sysfs_emit(buf, "%d\n", val);
0180 }
0181 
0182 static ssize_t in_label_show(struct device *dev,
0183                  struct device_attribute *devattr, char *buf)
0184 {
0185     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0186 
0187     return sysfs_emit(buf, "%s\n",
0188               SCH5636_IN_LABELS[attr->index]);
0189 }
0190 
0191 static ssize_t temp_value_show(struct device *dev,
0192                    struct device_attribute *devattr, char *buf)
0193 {
0194     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0195     struct sch5636_data *data = sch5636_update_device(dev);
0196     int val;
0197 
0198     if (IS_ERR(data))
0199         return PTR_ERR(data);
0200 
0201     val = (data->temp_val[attr->index] - 64) * 1000;
0202     return sysfs_emit(buf, "%d\n", val);
0203 }
0204 
0205 static ssize_t temp_fault_show(struct device *dev,
0206                    struct device_attribute *devattr, char *buf)
0207 {
0208     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0209     struct sch5636_data *data = sch5636_update_device(dev);
0210     int val;
0211 
0212     if (IS_ERR(data))
0213         return PTR_ERR(data);
0214 
0215     val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_WORKING) ? 0 : 1;
0216     return sysfs_emit(buf, "%d\n", val);
0217 }
0218 
0219 static ssize_t temp_alarm_show(struct device *dev,
0220                    struct device_attribute *devattr, char *buf)
0221 {
0222     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0223     struct sch5636_data *data = sch5636_update_device(dev);
0224     int val;
0225 
0226     if (IS_ERR(data))
0227         return PTR_ERR(data);
0228 
0229     val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_ALARM) ? 1 : 0;
0230     return sysfs_emit(buf, "%d\n", val);
0231 }
0232 
0233 static ssize_t fan_value_show(struct device *dev,
0234                   struct device_attribute *devattr, char *buf)
0235 {
0236     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0237     struct sch5636_data *data = sch5636_update_device(dev);
0238     int val;
0239 
0240     if (IS_ERR(data))
0241         return PTR_ERR(data);
0242 
0243     val = reg_to_rpm(data->fan_val[attr->index]);
0244     if (val < 0)
0245         return val;
0246 
0247     return sysfs_emit(buf, "%d\n", val);
0248 }
0249 
0250 static ssize_t fan_fault_show(struct device *dev,
0251                   struct device_attribute *devattr, char *buf)
0252 {
0253     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0254     struct sch5636_data *data = sch5636_update_device(dev);
0255     int val;
0256 
0257     if (IS_ERR(data))
0258         return PTR_ERR(data);
0259 
0260     val = (data->fan_ctrl[attr->index] & SCH5636_FAN_NOT_PRESENT) ? 1 : 0;
0261     return sysfs_emit(buf, "%d\n", val);
0262 }
0263 
0264 static ssize_t fan_alarm_show(struct device *dev,
0265                   struct device_attribute *devattr, char *buf)
0266 {
0267     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0268     struct sch5636_data *data = sch5636_update_device(dev);
0269     int val;
0270 
0271     if (IS_ERR(data))
0272         return PTR_ERR(data);
0273 
0274     val = (data->fan_ctrl[attr->index] & SCH5636_FAN_ALARM) ? 1 : 0;
0275     return sysfs_emit(buf, "%d\n", val);
0276 }
0277 
0278 static struct sensor_device_attribute sch5636_attr[] = {
0279     SENSOR_ATTR_RO(name, name, 0),
0280     SENSOR_ATTR_RO(in0_input, in_value, 0),
0281     SENSOR_ATTR_RO(in0_label, in_label, 0),
0282     SENSOR_ATTR_RO(in1_input, in_value, 1),
0283     SENSOR_ATTR_RO(in1_label, in_label, 1),
0284     SENSOR_ATTR_RO(in2_input, in_value, 2),
0285     SENSOR_ATTR_RO(in2_label, in_label, 2),
0286     SENSOR_ATTR_RO(in3_input, in_value, 3),
0287     SENSOR_ATTR_RO(in3_label, in_label, 3),
0288     SENSOR_ATTR_RO(in4_input, in_value, 4),
0289     SENSOR_ATTR_RO(in4_label, in_label, 4),
0290 };
0291 
0292 static struct sensor_device_attribute sch5636_temp_attr[] = {
0293     SENSOR_ATTR_RO(temp1_input, temp_value, 0),
0294     SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
0295     SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
0296     SENSOR_ATTR_RO(temp2_input, temp_value, 1),
0297     SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
0298     SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
0299     SENSOR_ATTR_RO(temp3_input, temp_value, 2),
0300     SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
0301     SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
0302     SENSOR_ATTR_RO(temp4_input, temp_value, 3),
0303     SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
0304     SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
0305     SENSOR_ATTR_RO(temp5_input, temp_value, 4),
0306     SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
0307     SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
0308     SENSOR_ATTR_RO(temp6_input, temp_value, 5),
0309     SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
0310     SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
0311     SENSOR_ATTR_RO(temp7_input, temp_value, 6),
0312     SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
0313     SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
0314     SENSOR_ATTR_RO(temp8_input, temp_value, 7),
0315     SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
0316     SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
0317     SENSOR_ATTR_RO(temp9_input, temp_value, 8),
0318     SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
0319     SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
0320     SENSOR_ATTR_RO(temp10_input, temp_value, 9),
0321     SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
0322     SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
0323     SENSOR_ATTR_RO(temp11_input, temp_value, 10),
0324     SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
0325     SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
0326     SENSOR_ATTR_RO(temp12_input, temp_value, 11),
0327     SENSOR_ATTR_RO(temp12_fault, temp_fault, 11),
0328     SENSOR_ATTR_RO(temp12_alarm, temp_alarm, 11),
0329     SENSOR_ATTR_RO(temp13_input, temp_value, 12),
0330     SENSOR_ATTR_RO(temp13_fault, temp_fault, 12),
0331     SENSOR_ATTR_RO(temp13_alarm, temp_alarm, 12),
0332     SENSOR_ATTR_RO(temp14_input, temp_value, 13),
0333     SENSOR_ATTR_RO(temp14_fault, temp_fault, 13),
0334     SENSOR_ATTR_RO(temp14_alarm, temp_alarm, 13),
0335     SENSOR_ATTR_RO(temp15_input, temp_value, 14),
0336     SENSOR_ATTR_RO(temp15_fault, temp_fault, 14),
0337     SENSOR_ATTR_RO(temp15_alarm, temp_alarm, 14),
0338     SENSOR_ATTR_RO(temp16_input, temp_value, 15),
0339     SENSOR_ATTR_RO(temp16_fault, temp_fault, 15),
0340     SENSOR_ATTR_RO(temp16_alarm, temp_alarm, 15),
0341 };
0342 
0343 static struct sensor_device_attribute sch5636_fan_attr[] = {
0344     SENSOR_ATTR_RO(fan1_input, fan_value, 0),
0345     SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
0346     SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
0347     SENSOR_ATTR_RO(fan2_input, fan_value, 1),
0348     SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
0349     SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
0350     SENSOR_ATTR_RO(fan3_input, fan_value, 2),
0351     SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
0352     SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
0353     SENSOR_ATTR_RO(fan4_input, fan_value, 3),
0354     SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
0355     SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
0356     SENSOR_ATTR_RO(fan5_input, fan_value, 4),
0357     SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
0358     SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
0359     SENSOR_ATTR_RO(fan6_input, fan_value, 5),
0360     SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
0361     SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
0362     SENSOR_ATTR_RO(fan7_input, fan_value, 6),
0363     SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
0364     SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
0365     SENSOR_ATTR_RO(fan8_input, fan_value, 7),
0366     SENSOR_ATTR_RO(fan8_fault, fan_fault, 7),
0367     SENSOR_ATTR_RO(fan8_alarm, fan_alarm, 7),
0368 };
0369 
0370 static int sch5636_remove(struct platform_device *pdev)
0371 {
0372     struct sch5636_data *data = platform_get_drvdata(pdev);
0373     int i;
0374 
0375     if (data->hwmon_dev)
0376         hwmon_device_unregister(data->hwmon_dev);
0377 
0378     for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++)
0379         device_remove_file(&pdev->dev, &sch5636_attr[i].dev_attr);
0380 
0381     for (i = 0; i < SCH5636_NO_TEMPS * 3; i++)
0382         device_remove_file(&pdev->dev,
0383                    &sch5636_temp_attr[i].dev_attr);
0384 
0385     for (i = 0; i < SCH5636_NO_FANS * 3; i++)
0386         device_remove_file(&pdev->dev,
0387                    &sch5636_fan_attr[i].dev_attr);
0388 
0389     return 0;
0390 }
0391 
0392 static int sch5636_probe(struct platform_device *pdev)
0393 {
0394     struct sch5636_data *data;
0395     int i, err, val, revision[2];
0396     char id[4];
0397 
0398     data = devm_kzalloc(&pdev->dev, sizeof(struct sch5636_data),
0399                 GFP_KERNEL);
0400     if (!data)
0401         return -ENOMEM;
0402 
0403     data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
0404     mutex_init(&data->update_lock);
0405     platform_set_drvdata(pdev, data);
0406 
0407     for (i = 0; i < 3; i++) {
0408         val = sch56xx_read_virtual_reg(data->addr,
0409                            SCH5636_REG_FUJITSU_ID + i);
0410         if (val < 0) {
0411             pr_err("Could not read Fujitsu id byte at %#x\n",
0412                 SCH5636_REG_FUJITSU_ID + i);
0413             err = val;
0414             goto error;
0415         }
0416         id[i] = val;
0417     }
0418     id[i] = '\0';
0419 
0420     if (strcmp(id, "THS")) {
0421         pr_err("Unknown Fujitsu id: %02x%02x%02x\n",
0422                id[0], id[1], id[2]);
0423         err = -ENODEV;
0424         goto error;
0425     }
0426 
0427     for (i = 0; i < 2; i++) {
0428         val = sch56xx_read_virtual_reg(data->addr,
0429                            SCH5636_REG_FUJITSU_REV + i);
0430         if (val < 0) {
0431             err = val;
0432             goto error;
0433         }
0434         revision[i] = val;
0435     }
0436     pr_info("Found %s chip at %#hx, revision: %d.%02d\n", DEVNAME,
0437         data->addr, revision[0], revision[1]);
0438 
0439     /* Read all temp + fan ctrl registers to determine which are active */
0440     for (i = 0; i < SCH5636_NO_TEMPS; i++) {
0441         val = sch56xx_read_virtual_reg(data->addr,
0442                            SCH5636_REG_TEMP_CTRL(i));
0443         if (unlikely(val < 0)) {
0444             err = val;
0445             goto error;
0446         }
0447         data->temp_ctrl[i] = val;
0448     }
0449 
0450     for (i = 0; i < SCH5636_NO_FANS; i++) {
0451         val = sch56xx_read_virtual_reg(data->addr,
0452                            SCH5636_REG_FAN_CTRL(i));
0453         if (unlikely(val < 0)) {
0454             err = val;
0455             goto error;
0456         }
0457         data->fan_ctrl[i] = val;
0458     }
0459 
0460     for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++) {
0461         err = device_create_file(&pdev->dev,
0462                      &sch5636_attr[i].dev_attr);
0463         if (err)
0464             goto error;
0465     }
0466 
0467     for (i = 0; i < (SCH5636_NO_TEMPS * 3); i++) {
0468         if (data->temp_ctrl[i/3] & SCH5636_TEMP_DEACTIVATED)
0469             continue;
0470 
0471         err = device_create_file(&pdev->dev,
0472                     &sch5636_temp_attr[i].dev_attr);
0473         if (err)
0474             goto error;
0475     }
0476 
0477     for (i = 0; i < (SCH5636_NO_FANS * 3); i++) {
0478         if (data->fan_ctrl[i/3] & SCH5636_FAN_DEACTIVATED)
0479             continue;
0480 
0481         err = device_create_file(&pdev->dev,
0482                     &sch5636_fan_attr[i].dev_attr);
0483         if (err)
0484             goto error;
0485     }
0486 
0487     data->hwmon_dev = hwmon_device_register(&pdev->dev);
0488     if (IS_ERR(data->hwmon_dev)) {
0489         err = PTR_ERR(data->hwmon_dev);
0490         data->hwmon_dev = NULL;
0491         goto error;
0492     }
0493 
0494     /* Note failing to register the watchdog is not a fatal error */
0495     sch56xx_watchdog_register(&pdev->dev, data->addr, (revision[0] << 8) | revision[1],
0496                   &data->update_lock, 0);
0497 
0498     return 0;
0499 
0500 error:
0501     sch5636_remove(pdev);
0502     return err;
0503 }
0504 
0505 static const struct platform_device_id sch5636_device_id[] = {
0506     {
0507         .name = "sch5636",
0508     },
0509     { }
0510 };
0511 MODULE_DEVICE_TABLE(platform, sch5636_device_id);
0512 
0513 static struct platform_driver sch5636_driver = {
0514     .driver = {
0515         .name   = DRVNAME,
0516     },
0517     .probe      = sch5636_probe,
0518     .remove     = sch5636_remove,
0519     .id_table   = sch5636_device_id,
0520 };
0521 
0522 module_platform_driver(sch5636_driver);
0523 
0524 MODULE_DESCRIPTION("SMSC SCH5636 Hardware Monitoring Driver");
0525 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
0526 MODULE_LICENSE("GPL");
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