linux/drivers/hwmon/ultra45_env.c
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   1/*
   2 * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
   3 *
   4 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/types.h>
   9#include <linux/slab.h>
  10#include <linux/module.h>
  11#include <linux/of_device.h>
  12#include <linux/io.h>
  13#include <linux/hwmon.h>
  14#include <linux/hwmon-sysfs.h>
  15#include <linux/err.h>
  16
  17#define DRV_MODULE_VERSION      "0.1"
  18
  19MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  20MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
  21MODULE_LICENSE("GPL");
  22MODULE_VERSION(DRV_MODULE_VERSION);
  23
  24/* PIC device registers */
  25#define REG_CMD         0x00UL
  26#define  REG_CMD_RESET  0x80
  27#define  REG_CMD_ESTAR  0x01
  28#define REG_STAT        0x01UL
  29#define  REG_STAT_FWVER 0xf0
  30#define  REG_STAT_TGOOD 0x08
  31#define  REG_STAT_STALE 0x04
  32#define  REG_STAT_BUSY  0x02
  33#define  REG_STAT_FAULT 0x01
  34#define REG_DATA        0x40UL
  35#define REG_ADDR        0x41UL
  36#define REG_SIZE        0x42UL
  37
  38/* Registers accessed indirectly via REG_DATA/REG_ADDR */
  39#define IREG_FAN0               0x00
  40#define IREG_FAN1               0x01
  41#define IREG_FAN2               0x02
  42#define IREG_FAN3               0x03
  43#define IREG_FAN4               0x04
  44#define IREG_FAN5               0x05
  45#define IREG_LCL_TEMP           0x06
  46#define IREG_RMT1_TEMP          0x07
  47#define IREG_RMT2_TEMP          0x08
  48#define IREG_RMT3_TEMP          0x09
  49#define IREG_LM95221_TEMP       0x0a
  50#define IREG_FIRE_TEMP          0x0b
  51#define IREG_LSI1064_TEMP       0x0c
  52#define IREG_FRONT_TEMP         0x0d
  53#define IREG_FAN_STAT           0x0e
  54#define IREG_VCORE0             0x0f
  55#define IREG_VCORE1             0x10
  56#define IREG_VMEM0              0x11
  57#define IREG_VMEM1              0x12
  58#define IREG_PSU_TEMP           0x13
  59
  60struct env {
  61        void __iomem    *regs;
  62        spinlock_t      lock;
  63
  64        struct device   *hwmon_dev;
  65};
  66
  67static u8 env_read(struct env *p, u8 ireg)
  68{
  69        u8 ret;
  70
  71        spin_lock(&p->lock);
  72        writeb(ireg, p->regs + REG_ADDR);
  73        ret = readb(p->regs + REG_DATA);
  74        spin_unlock(&p->lock);
  75
  76        return ret;
  77}
  78
  79static void env_write(struct env *p, u8 ireg, u8 val)
  80{
  81        spin_lock(&p->lock);
  82        writeb(ireg, p->regs + REG_ADDR);
  83        writeb(val, p->regs + REG_DATA);
  84        spin_unlock(&p->lock);
  85}
  86
  87/*
  88 * There seems to be a adr7462 providing these values, thus a lot
  89 * of these calculations are borrowed from the adt7470 driver.
  90 */
  91#define FAN_PERIOD_TO_RPM(x)    ((90000 * 60) / (x))
  92#define FAN_RPM_TO_PERIOD       FAN_PERIOD_TO_RPM
  93#define FAN_PERIOD_INVALID      (0xff << 8)
  94#define FAN_DATA_VALID(x)       ((x) && (x) != FAN_PERIOD_INVALID)
  95
  96static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,
  97                              char *buf)
  98{
  99        int fan_nr = to_sensor_dev_attr(attr)->index;
 100        struct env *p = dev_get_drvdata(dev);
 101        int rpm, period;
 102        u8 val;
 103
 104        val = env_read(p, IREG_FAN0 + fan_nr);
 105        period = (int) val << 8;
 106        if (FAN_DATA_VALID(period))
 107                rpm = FAN_PERIOD_TO_RPM(period);
 108        else
 109                rpm = 0;
 110
 111        return sprintf(buf, "%d\n", rpm);
 112}
 113
 114static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
 115                             const char *buf, size_t count)
 116{
 117        int fan_nr = to_sensor_dev_attr(attr)->index;
 118        unsigned long rpm;
 119        struct env *p = dev_get_drvdata(dev);
 120        int period;
 121        u8 val;
 122        int err;
 123
 124        err = kstrtoul(buf, 10, &rpm);
 125        if (err)
 126                return err;
 127
 128        if (!rpm)
 129                return -EINVAL;
 130
 131        period = FAN_RPM_TO_PERIOD(rpm);
 132        val = period >> 8;
 133        env_write(p, IREG_FAN0 + fan_nr, val);
 134
 135        return count;
 136}
 137
 138static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,
 139                              char *buf)
 140{
 141        int fan_nr = to_sensor_dev_attr(attr)->index;
 142        struct env *p = dev_get_drvdata(dev);
 143        u8 val = env_read(p, IREG_FAN_STAT);
 144        return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
 145}
 146
 147#define fan(index)                                                      \
 148static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR,        \
 149                show_fan_speed, set_fan_speed, index);                  \
 150static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO,                  \
 151                show_fan_fault, NULL, index)
 152
 153fan(0);
 154fan(1);
 155fan(2);
 156fan(3);
 157fan(4);
 158
 159static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
 160
 161static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 162                         char *buf)
 163{
 164        int temp_nr = to_sensor_dev_attr(attr)->index;
 165        struct env *p = dev_get_drvdata(dev);
 166        s8 val;
 167
 168        val = env_read(p, IREG_LCL_TEMP + temp_nr);
 169        return sprintf(buf, "%d\n", ((int) val) - 64);
 170}
 171
 172static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
 173static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
 174static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
 175static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
 176static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
 177static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
 178static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
 179static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
 180static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
 181
 182static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,
 183                             char *buf)
 184{
 185        int index = to_sensor_dev_attr(attr)->index;
 186        struct env *p = dev_get_drvdata(dev);
 187        u8 val;
 188
 189        val = readb(p->regs + REG_STAT);
 190        return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
 191}
 192
 193static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
 194static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
 195static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
 196static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
 197                          3);
 198
 199static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,
 200                          char *buf)
 201{
 202        struct env *p = dev_get_drvdata(dev);
 203        u8 val;
 204
 205        val = readb(p->regs + REG_STAT);
 206        return sprintf(buf, "%d\n", val >> 4);
 207}
 208
 209static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
 210
 211static ssize_t show_name(struct device *dev, struct device_attribute *attr,
 212                         char *buf)
 213{
 214        return sprintf(buf, "ultra45\n");
 215}
 216
 217static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 218
 219static struct attribute *env_attributes[] = {
 220        &sensor_dev_attr_fan0_speed.dev_attr.attr,
 221        &sensor_dev_attr_fan0_fault.dev_attr.attr,
 222        &sensor_dev_attr_fan1_speed.dev_attr.attr,
 223        &sensor_dev_attr_fan1_fault.dev_attr.attr,
 224        &sensor_dev_attr_fan2_speed.dev_attr.attr,
 225        &sensor_dev_attr_fan2_fault.dev_attr.attr,
 226        &sensor_dev_attr_fan3_speed.dev_attr.attr,
 227        &sensor_dev_attr_fan3_fault.dev_attr.attr,
 228        &sensor_dev_attr_fan4_speed.dev_attr.attr,
 229        &sensor_dev_attr_fan4_fault.dev_attr.attr,
 230        &sensor_dev_attr_psu_fan_fault.dev_attr.attr,
 231        &sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
 232        &sensor_dev_attr_cpu0_temp.dev_attr.attr,
 233        &sensor_dev_attr_cpu1_temp.dev_attr.attr,
 234        &sensor_dev_attr_motherboard_temp.dev_attr.attr,
 235        &sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
 236        &sensor_dev_attr_fire_temp.dev_attr.attr,
 237        &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
 238        &sensor_dev_attr_front_panel_temp.dev_attr.attr,
 239        &sensor_dev_attr_psu_temp.dev_attr.attr,
 240        &sensor_dev_attr_fan_failure.dev_attr.attr,
 241        &sensor_dev_attr_env_bus_busy.dev_attr.attr,
 242        &sensor_dev_attr_env_data_stale.dev_attr.attr,
 243        &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
 244        &sensor_dev_attr_firmware_version.dev_attr.attr,
 245        &sensor_dev_attr_name.dev_attr.attr,
 246        NULL,
 247};
 248
 249static const struct attribute_group env_group = {
 250        .attrs = env_attributes,
 251};
 252
 253static int env_probe(struct platform_device *op)
 254{
 255        struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
 256        int err = -ENOMEM;
 257
 258        if (!p)
 259                goto out;
 260
 261        spin_lock_init(&p->lock);
 262
 263        p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
 264        if (!p->regs)
 265                goto out_free;
 266
 267        err = sysfs_create_group(&op->dev.kobj, &env_group);
 268        if (err)
 269                goto out_iounmap;
 270
 271        p->hwmon_dev = hwmon_device_register(&op->dev);
 272        if (IS_ERR(p->hwmon_dev)) {
 273                err = PTR_ERR(p->hwmon_dev);
 274                goto out_sysfs_remove_group;
 275        }
 276
 277        platform_set_drvdata(op, p);
 278        err = 0;
 279
 280out:
 281        return err;
 282
 283out_sysfs_remove_group:
 284        sysfs_remove_group(&op->dev.kobj, &env_group);
 285
 286out_iounmap:
 287        of_iounmap(&op->resource[0], p->regs, REG_SIZE);
 288
 289out_free:
 290        kfree(p);
 291        goto out;
 292}
 293
 294static 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                kfree(p);
 303        }
 304
 305        return 0;
 306}
 307
 308static const struct of_device_id env_match[] = {
 309        {
 310                .name = "env-monitor",
 311                .compatible = "SUNW,ebus-pic16f747-env",
 312        },
 313        {},
 314};
 315MODULE_DEVICE_TABLE(of, env_match);
 316
 317static struct platform_driver env_driver = {
 318        .driver = {
 319                .name = "ultra45_env",
 320                .owner = THIS_MODULE,
 321                .of_match_table = env_match,
 322        },
 323        .probe          = env_probe,
 324        .remove         = env_remove,
 325};
 326
 327module_platform_driver(env_driver);
 328
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