Merge commit 'main-jb-2012.08.03-B4' into t114-0806
[linux-2.6.git] / drivers / hwmon / ultra45_env.c
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
16 #define DRV_MODULE_VERSION      "0.1"
17
18 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
19 MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
20 MODULE_LICENSE("GPL");
21 MODULE_VERSION(DRV_MODULE_VERSION);
22
23 /* PIC device registers */
24 #define REG_CMD         0x00UL
25 #define  REG_CMD_RESET  0x80
26 #define  REG_CMD_ESTAR  0x01
27 #define REG_STAT        0x01UL
28 #define  REG_STAT_FWVER 0xf0
29 #define  REG_STAT_TGOOD 0x08
30 #define  REG_STAT_STALE 0x04
31 #define  REG_STAT_BUSY  0x02
32 #define  REG_STAT_FAULT 0x01
33 #define REG_DATA        0x40UL
34 #define REG_ADDR        0x41UL
35 #define REG_SIZE        0x42UL
36
37 /* Registers accessed indirectly via REG_DATA/REG_ADDR */
38 #define IREG_FAN0               0x00
39 #define IREG_FAN1               0x01
40 #define IREG_FAN2               0x02
41 #define IREG_FAN3               0x03
42 #define IREG_FAN4               0x04
43 #define IREG_FAN5               0x05
44 #define IREG_LCL_TEMP           0x06
45 #define IREG_RMT1_TEMP          0x07
46 #define IREG_RMT2_TEMP          0x08
47 #define IREG_RMT3_TEMP          0x09
48 #define IREG_LM95221_TEMP       0x0a
49 #define IREG_FIRE_TEMP          0x0b
50 #define IREG_LSI1064_TEMP       0x0c
51 #define IREG_FRONT_TEMP         0x0d
52 #define IREG_FAN_STAT           0x0e
53 #define IREG_VCORE0             0x0f
54 #define IREG_VCORE1             0x10
55 #define IREG_VMEM0              0x11
56 #define IREG_VMEM1              0x12
57 #define IREG_PSU_TEMP           0x13
58
59 struct env {
60         void __iomem    *regs;
61         spinlock_t      lock;
62
63         struct device   *hwmon_dev;
64 };
65
66 static u8 env_read(struct env *p, u8 ireg)
67 {
68         u8 ret;
69
70         spin_lock(&p->lock);
71         writeb(ireg, p->regs + REG_ADDR);
72         ret = readb(p->regs + REG_DATA);
73         spin_unlock(&p->lock);
74
75         return ret;
76 }
77
78 static void env_write(struct env *p, u8 ireg, u8 val)
79 {
80         spin_lock(&p->lock);
81         writeb(ireg, p->regs + REG_ADDR);
82         writeb(val, p->regs + REG_DATA);
83         spin_unlock(&p->lock);
84 }
85
86 /*
87  * There seems to be a adr7462 providing these values, thus a lot
88  * of these calculations are borrowed from the adt7470 driver.
89  */
90 #define FAN_PERIOD_TO_RPM(x)    ((90000 * 60) / (x))
91 #define FAN_RPM_TO_PERIOD       FAN_PERIOD_TO_RPM
92 #define FAN_PERIOD_INVALID      (0xff << 8)
93 #define FAN_DATA_VALID(x)       ((x) && (x) != FAN_PERIOD_INVALID)
94
95 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,
96                               char *buf)
97 {
98         int fan_nr = to_sensor_dev_attr(attr)->index;
99         struct env *p = dev_get_drvdata(dev);
100         int rpm, period;
101         u8 val;
102
103         val = env_read(p, IREG_FAN0 + fan_nr);
104         period = (int) val << 8;
105         if (FAN_DATA_VALID(period))
106                 rpm = FAN_PERIOD_TO_RPM(period);
107         else
108                 rpm = 0;
109
110         return sprintf(buf, "%d\n", rpm);
111 }
112
113 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
114                              const char *buf, size_t count)
115 {
116         int fan_nr = to_sensor_dev_attr(attr)->index;
117         unsigned long rpm;
118         struct env *p = dev_get_drvdata(dev);
119         int period;
120         u8 val;
121         int err;
122
123         err = kstrtoul(buf, 10, &rpm);
124         if (err)
125                 return err;
126
127         if (!rpm)
128                 return -EINVAL;
129
130         period = FAN_RPM_TO_PERIOD(rpm);
131         val = period >> 8;
132         env_write(p, IREG_FAN0 + fan_nr, val);
133
134         return count;
135 }
136
137 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,
138                               char *buf)
139 {
140         int fan_nr = to_sensor_dev_attr(attr)->index;
141         struct env *p = dev_get_drvdata(dev);
142         u8 val = env_read(p, IREG_FAN_STAT);
143         return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
144 }
145
146 #define fan(index)                                                      \
147 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR,        \
148                 show_fan_speed, set_fan_speed, index);                  \
149 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO,                  \
150                 show_fan_fault, NULL, index)
151
152 fan(0);
153 fan(1);
154 fan(2);
155 fan(3);
156 fan(4);
157
158 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
159
160 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
161                          char *buf)
162 {
163         int temp_nr = to_sensor_dev_attr(attr)->index;
164         struct env *p = dev_get_drvdata(dev);
165         s8 val;
166
167         val = env_read(p, IREG_LCL_TEMP + temp_nr);
168         return sprintf(buf, "%d\n", ((int) val) - 64);
169 }
170
171 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
172 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
173 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
174 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
175 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
176 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
177 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
178 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
179 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
180
181 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,
182                              char *buf)
183 {
184         int index = to_sensor_dev_attr(attr)->index;
185         struct env *p = dev_get_drvdata(dev);
186         u8 val;
187
188         val = readb(p->regs + REG_STAT);
189         return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
190 }
191
192 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
193 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
194 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
195 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
196                           3);
197
198 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,
199                           char *buf)
200 {
201         struct env *p = dev_get_drvdata(dev);
202         u8 val;
203
204         val = readb(p->regs + REG_STAT);
205         return sprintf(buf, "%d\n", val >> 4);
206 }
207
208 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
209
210 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
211                          char *buf)
212 {
213         return sprintf(buf, "ultra45\n");
214 }
215
216 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
217
218 static struct attribute *env_attributes[] = {
219         &sensor_dev_attr_fan0_speed.dev_attr.attr,
220         &sensor_dev_attr_fan0_fault.dev_attr.attr,
221         &sensor_dev_attr_fan1_speed.dev_attr.attr,
222         &sensor_dev_attr_fan1_fault.dev_attr.attr,
223         &sensor_dev_attr_fan2_speed.dev_attr.attr,
224         &sensor_dev_attr_fan2_fault.dev_attr.attr,
225         &sensor_dev_attr_fan3_speed.dev_attr.attr,
226         &sensor_dev_attr_fan3_fault.dev_attr.attr,
227         &sensor_dev_attr_fan4_speed.dev_attr.attr,
228         &sensor_dev_attr_fan4_fault.dev_attr.attr,
229         &sensor_dev_attr_psu_fan_fault.dev_attr.attr,
230         &sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
231         &sensor_dev_attr_cpu0_temp.dev_attr.attr,
232         &sensor_dev_attr_cpu1_temp.dev_attr.attr,
233         &sensor_dev_attr_motherboard_temp.dev_attr.attr,
234         &sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
235         &sensor_dev_attr_fire_temp.dev_attr.attr,
236         &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
237         &sensor_dev_attr_front_panel_temp.dev_attr.attr,
238         &sensor_dev_attr_psu_temp.dev_attr.attr,
239         &sensor_dev_attr_fan_failure.dev_attr.attr,
240         &sensor_dev_attr_env_bus_busy.dev_attr.attr,
241         &sensor_dev_attr_env_data_stale.dev_attr.attr,
242         &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
243         &sensor_dev_attr_firmware_version.dev_attr.attr,
244         &sensor_dev_attr_name.dev_attr.attr,
245         NULL,
246 };
247
248 static const struct attribute_group env_group = {
249         .attrs = env_attributes,
250 };
251
252 static int __devinit env_probe(struct platform_device *op)
253 {
254         struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
255         int err = -ENOMEM;
256
257         if (!p)
258                 goto out;
259
260         spin_lock_init(&p->lock);
261
262         p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
263         if (!p->regs)
264                 goto out_free;
265
266         err = sysfs_create_group(&op->dev.kobj, &env_group);
267         if (err)
268                 goto out_iounmap;
269
270         p->hwmon_dev = hwmon_device_register(&op->dev);
271         if (IS_ERR(p->hwmon_dev)) {
272                 err = PTR_ERR(p->hwmon_dev);
273                 goto out_sysfs_remove_group;
274         }
275
276         platform_set_drvdata(op, p);
277         err = 0;
278
279 out:
280         return err;
281
282 out_sysfs_remove_group:
283         sysfs_remove_group(&op->dev.kobj, &env_group);
284
285 out_iounmap:
286         of_iounmap(&op->resource[0], p->regs, REG_SIZE);
287
288 out_free:
289         kfree(p);
290         goto out;
291 }
292
293 static int __devexit env_remove(struct platform_device *op)
294 {
295         struct env *p = platform_get_drvdata(op);
296
297         if (p) {
298                 sysfs_remove_group(&op->dev.kobj, &env_group);
299                 hwmon_device_unregister(p->hwmon_dev);
300                 of_iounmap(&op->resource[0], p->regs, REG_SIZE);
301                 kfree(p);
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                 .owner = THIS_MODULE,
320                 .of_match_table = env_match,
321         },
322         .probe          = env_probe,
323         .remove         = __devexit_p(env_remove),
324 };
325
326 module_platform_driver(env_driver);