drivers/hwmon/ultra45_env.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
   4  *
   5  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/slab.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/io.h>
  15 #include <linux/hwmon.h>
  16 #include <linux/hwmon-sysfs.h>
  17 #include <linux/err.h>
  18
  19 #define DRV_MODULE_VERSION      "0.1"
  20
  21 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  22 MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
  23 MODULE_LICENSE("GPL");
  24 MODULE_VERSION(DRV_MODULE_VERSION);
  25
  26 /* PIC device registers */
  27 #define REG_CMD         0x00UL
  28 #define  REG_CMD_RESET  0x80
  29 #define  REG_CMD_ESTAR  0x01
  30 #define REG_STAT        0x01UL
  31 #define  REG_STAT_FWVER 0xf0
  32 #define  REG_STAT_TGOOD 0x08
  33 #define  REG_STAT_STALE 0x04
  34 #define  REG_STAT_BUSY  0x02
  35 #define  REG_STAT_FAULT 0x01
  36 #define REG_DATA        0x40UL
  37 #define REG_ADDR        0x41UL
  38 #define REG_SIZE        0x42UL
  39
  40 /* Registers accessed indirectly via REG_DATA/REG_ADDR */
  41 #define IREG_FAN0               0x00
  42 #define IREG_FAN1               0x01
  43 #define IREG_FAN2               0x02
  44 #define IREG_FAN3               0x03
  45 #define IREG_FAN4               0x04
  46 #define IREG_FAN5               0x05
  47 #define IREG_LCL_TEMP           0x06
  48 #define IREG_RMT1_TEMP          0x07
  49 #define IREG_RMT2_TEMP          0x08
  50 #define IREG_RMT3_TEMP          0x09
  51 #define IREG_LM95221_TEMP       0x0a
  52 #define IREG_FIRE_TEMP          0x0b
  53 #define IREG_LSI1064_TEMP       0x0c
  54 #define IREG_FRONT_TEMP         0x0d
  55 #define IREG_FAN_STAT           0x0e
  56 #define IREG_VCORE0             0x0f
  57 #define IREG_VCORE1             0x10
  58 #define IREG_VMEM0              0x11
  59 #define IREG_VMEM1              0x12
  60 #define IREG_PSU_TEMP           0x13
  61
  62 struct env {
  63         void __iomem    *regs;
  64         spinlock_t      lock;
  65
  66         struct device   *hwmon_dev;
  67 };
  68
  69 static u8 env_read(struct env *p, u8 ireg)
  70 {
  71         u8 ret;
  72
  73         spin_lock(&p->lock);
  74         writeb(ireg, p->regs + REG_ADDR);
  75         ret = readb(p->regs + REG_DATA);
  76         spin_unlock(&p->lock);
  77
  78         return ret;
  79 }
  80
  81 static void env_write(struct env *p, u8 ireg, u8 val)
  82 {
  83         spin_lock(&p->lock);
  84         writeb(ireg, p->regs + REG_ADDR);
  85         writeb(val, p->regs + REG_DATA);
  86         spin_unlock(&p->lock);
  87 }
  88
  89 /*
  90  * There seems to be a adr7462 providing these values, thus a lot
  91  * of these calculations are borrowed from the adt7470 driver.
  92  */
  93 #define FAN_PERIOD_TO_RPM(x)    ((90000 * 60) / (x))
  94 #define FAN_RPM_TO_PERIOD       FAN_PERIOD_TO_RPM
  95 #define FAN_PERIOD_INVALID      (0xff << 8)
  96 #define FAN_DATA_VALID(x)       ((x) && (x) != FAN_PERIOD_INVALID)
  97
  98 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,
  99                               char *buf)
 100 {
 101         int fan_nr = to_sensor_dev_attr(attr)->index;
 102         struct env *p = dev_get_drvdata(dev);
 103         int rpm, period;
 104         u8 val;
 105
 106         val = env_read(p, IREG_FAN0 + fan_nr);
 107         period = (int) val << 8;
 108         if (FAN_DATA_VALID(period))
 109                 rpm = FAN_PERIOD_TO_RPM(period);
 110         else
 111                 rpm = 0;
 112
 113         return sprintf(buf, "%d\n", rpm);
 114 }
 115
 116 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
 117                              const char *buf, size_t count)
 118 {
 119         int fan_nr = to_sensor_dev_attr(attr)->index;
 120         unsigned long rpm;
 121         struct env *p = dev_get_drvdata(dev);
 122         int period;
 123         u8 val;
 124         int err;
 125
 126         err = kstrtoul(buf, 10, &rpm);
 127         if (err)
 128                 return err;
 129
 130         if (!rpm)
 131                 return -EINVAL;
 132
 133         period = FAN_RPM_TO_PERIOD(rpm);
 134         val = period >> 8;
 135         env_write(p, IREG_FAN0 + fan_nr, val);
 136
 137         return count;
 138 }
 139
 140 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,
 141                               char *buf)
 142 {
 143         int fan_nr = to_sensor_dev_attr(attr)->index;
 144         struct env *p = dev_get_drvdata(dev);
 145         u8 val = env_read(p, IREG_FAN_STAT);
 146         return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
 147 }
 148
 149 #define fan(index)                                                      \
 150 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR,        \
 151                 show_fan_speed, set_fan_speed, index);                  \
 152 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO,                  \
 153                 show_fan_fault, NULL, index)
 154
 155 fan(0);
 156 fan(1);
 157 fan(2);
 158 fan(3);
 159 fan(4);
 160
 161 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
 162
 163 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 164                          char *buf)
 165 {
 166         int temp_nr = to_sensor_dev_attr(attr)->index;
 167         struct env *p = dev_get_drvdata(dev);
 168         s8 val;
 169
 170         val = env_read(p, IREG_LCL_TEMP + temp_nr);
 171         return sprintf(buf, "%d\n", ((int) val) - 64);
 172 }
 173
 174 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
 175 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
 176 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
 177 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
 178 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
 179 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
 180 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
 181 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
 182 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
 183
 184 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,
 185                              char *buf)
 186 {
 187         int index = to_sensor_dev_attr(attr)->index;
 188         struct env *p = dev_get_drvdata(dev);
 189         u8 val;
 190
 191         val = readb(p->regs + REG_STAT);
 192         return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
 193 }
 194
 195 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
 196 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
 197 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
 198 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
 199                           3);
 200
 201 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,
 202                           char *buf)
 203 {
 204         struct env *p = dev_get_drvdata(dev);
 205         u8 val;
 206
 207         val = readb(p->regs + REG_STAT);
 208         return sprintf(buf, "%d\n", val >> 4);
 209 }
 210
 211 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
 212
 213 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
 214                          char *buf)
 215 {
 216         return sprintf(buf, "ultra45\n");
 217 }
 218
 219 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 220
 221 static struct attribute *env_attributes[] = {
 222         &sensor_dev_attr_fan0_speed.dev_attr.attr,
 223         &sensor_dev_attr_fan0_fault.dev_attr.attr,
 224         &sensor_dev_attr_fan1_speed.dev_attr.attr,
 225         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 226         &sensor_dev_attr_fan2_speed.dev_attr.attr,
 227         &sensor_dev_attr_fan2_fault.dev_attr.attr,
 228         &sensor_dev_attr_fan3_speed.dev_attr.attr,
 229         &sensor_dev_attr_fan3_fault.dev_attr.attr,
 230         &sensor_dev_attr_fan4_speed.dev_attr.attr,
 231         &sensor_dev_attr_fan4_fault.dev_attr.attr,
 232         &sensor_dev_attr_psu_fan_fault.dev_attr.attr,
 233         &sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
 234         &sensor_dev_attr_cpu0_temp.dev_attr.attr,
 235         &sensor_dev_attr_cpu1_temp.dev_attr.attr,
 236         &sensor_dev_attr_motherboard_temp.dev_attr.attr,
 237         &sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
 238         &sensor_dev_attr_fire_temp.dev_attr.attr,
 239         &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
 240         &sensor_dev_attr_front_panel_temp.dev_attr.attr,
 241         &sensor_dev_attr_psu_temp.dev_attr.attr,
 242         &sensor_dev_attr_fan_failure.dev_attr.attr,
 243         &sensor_dev_attr_env_bus_busy.dev_attr.attr,
 244         &sensor_dev_attr_env_data_stale.dev_attr.attr,
 245         &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
 246         &sensor_dev_attr_firmware_version.dev_attr.attr,
 247         &sensor_dev_attr_name.dev_attr.attr,
 248         NULL,
 249 };
 250
 251 static const struct attribute_group env_group = {
 252         .attrs = env_attributes,
 253 };
 254
 255 static int env_probe(struct platform_device *op)
 256 {
 257         struct env *p = devm_kzalloc(&op->dev, sizeof(*p), GFP_KERNEL);
 258         int err = -ENOMEM;
 259
 260         if (!p)
 261                 goto out;
 262
 263         spin_lock_init(&p->lock);
 264
 265         p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
 266         if (!p->regs)
 267                 goto out;
 268
 269         err = sysfs_create_group(&op->dev.kobj, &env_group);
 270         if (err)
 271                 goto out_iounmap;
 272
 273         p->hwmon_dev = hwmon_device_register(&op->dev);
 274         if (IS_ERR(p->hwmon_dev)) {
 275                 err = PTR_ERR(p->hwmon_dev);
 276                 goto out_sysfs_remove_group;
 277         }
 278
 279         platform_set_drvdata(op, p);
 280         err = 0;
 281
 282 out:
 283         return err;
 284
 285 out_sysfs_remove_group:
 286         sysfs_remove_group(&op->dev.kobj, &env_group);
 287
 288 out_iounmap:
 289         of_iounmap(&op->resource[0], p->regs, REG_SIZE);
 290
 291         goto out;
 292 }
 293
 294 static int env_remove(struct platform_device *op)
 295 {
 296         struct env *p = platform_get_drvdata(op);
 297
 298         if (p) {
 299                 sysfs_remove_group(&op->dev.kobj, &env_group);
 300                 hwmon_device_unregister(p->hwmon_dev);
 301                 of_iounmap(&op->resource[0], p->regs, REG_SIZE);
 302         }
 303
 304         return 0;
 305 }
 306
 307 static const struct of_device_id env_match[] = {
 308         {
 309                 .name = "env-monitor",
 310                 .compatible = "SUNW,ebus-pic16f747-env",
 311         },
 312         {},
 313 };
 314 MODULE_DEVICE_TABLE(of, env_match);
 315
 316 static struct platform_driver env_driver = {
 317         .driver = {
 318                 .name = "ultra45_env",
 319                 .of_match_table = env_match,
 320         },
 321         .probe          = env_probe,
 322         .remove         = env_remove,
 323 };
 324
 325 module_platform_driver(env_driver);