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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 <[email protected]>
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 
19 MODULE_AUTHOR("David S. Miller ([email protected])");
20 MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
21 MODULE_LICENSE("GPL");
22 MODULE_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 
60 struct env {
61  void __iomem *regs;
62  spinlock_t lock;
63 
64  struct device *hwmon_dev;
65 };
66 
67 static 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 
79 static 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 
96 static 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 
114 static 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 
138 static 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) \
148 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \
149  show_fan_speed, set_fan_speed, index); \
150 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \
151  show_fan_fault, NULL, index)
152 
153 fan(0);
154 fan(1);
155 fan(2);
156 fan(3);
157 fan(4);
158 
159 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
160 
161 static 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 
172 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
173 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
174 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
175 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
176 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
177 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
178 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
179 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
180 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
181 
182 static 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 
193 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
194 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
195 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
196 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
197  3);
198 
199 static 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 
209 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
210 
211 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
212  char *buf)
213 {
214  return sprintf(buf, "ultra45\n");
215 }
216 
217 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
218 
219 static 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 
249 static const struct attribute_group env_group = {
250  .attrs = env_attributes,
251 };
252 
253 static int __devinit 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 
280 out:
281  return err;
282 
283 out_sysfs_remove_group:
284  sysfs_remove_group(&op->dev.kobj, &env_group);
285 
286 out_iounmap:
287  of_iounmap(&op->resource[0], p->regs, REG_SIZE);
288 
289 out_free:
290  kfree(p);
291  goto out;
292 }
293 
294 static int __devexit 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 
308 static const struct of_device_id env_match[] = {
309  {
310  .name = "env-monitor",
311  .compatible = "SUNW,ebus-pic16f747-env",
312  },
313  {},
314 };
315 MODULE_DEVICE_TABLE(of, env_match);
316 
317 static 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 = __devexit_p(env_remove),
325 };
326 
327 module_platform_driver(env_driver);
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