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David S. Millere0418082008-08-24 20:59:49 -07001/* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
2 *
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
5
6#include <linux/kernel.h>
7#include <linux/types.h>
8#include <linux/slab.h>
9#include <linux/of_device.h>
10#include <linux/io.h>
11#include <linux/hwmon.h>
12#include <linux/hwmon-sysfs.h>
13
14#define DRV_MODULE_VERSION "0.1"
15
16MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
17MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
18MODULE_LICENSE("GPL");
19MODULE_VERSION(DRV_MODULE_VERSION);
20
21/* PIC device registers */
22#define REG_CMD 0x00UL
23#define REG_CMD_RESET 0x80
24#define REG_CMD_ESTAR 0x01
25#define REG_STAT 0x01UL
26#define REG_STAT_FWVER 0xf0
27#define REG_STAT_TGOOD 0x08
28#define REG_STAT_STALE 0x04
29#define REG_STAT_BUSY 0x02
30#define REG_STAT_FAULT 0x01
31#define REG_DATA 0x40UL
32#define REG_ADDR 0x41UL
33#define REG_SIZE 0x42UL
34
35/* Registers accessed indirectly via REG_DATA/REG_ADDR */
36#define IREG_FAN0 0x00
37#define IREG_FAN1 0x01
38#define IREG_FAN2 0x02
39#define IREG_FAN3 0x03
40#define IREG_FAN4 0x04
41#define IREG_FAN5 0x05
42#define IREG_LCL_TEMP 0x06
43#define IREG_RMT1_TEMP 0x07
44#define IREG_RMT2_TEMP 0x08
45#define IREG_RMT3_TEMP 0x09
46#define IREG_LM95221_TEMP 0x0a
47#define IREG_FIRE_TEMP 0x0b
48#define IREG_LSI1064_TEMP 0x0c
49#define IREG_FRONT_TEMP 0x0d
50#define IREG_FAN_STAT 0x0e
51#define IREG_VCORE0 0x0f
52#define IREG_VCORE1 0x10
53#define IREG_VMEM0 0x11
54#define IREG_VMEM1 0x12
55#define IREG_PSU_TEMP 0x13
56
57struct env {
58 void __iomem *regs;
59 spinlock_t lock;
60
61 struct device *hwmon_dev;
62};
63
64static u8 env_read(struct env *p, u8 ireg)
65{
66 u8 ret;
67
68 spin_lock(&p->lock);
69 writeb(ireg, p->regs + REG_ADDR);
70 ret = readb(p->regs + REG_DATA);
71 spin_unlock(&p->lock);
72
73 return ret;
74}
75
76static void env_write(struct env *p, u8 ireg, u8 val)
77{
78 spin_lock(&p->lock);
79 writeb(ireg, p->regs + REG_ADDR);
80 writeb(val, p->regs + REG_DATA);
81 spin_unlock(&p->lock);
82}
83
84/* There seems to be a adr7462 providing these values, thus a lot
85 * of these calculations are borrowed from the adt7470 driver.
86 */
87#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
88#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
89#define FAN_PERIOD_INVALID (0xff << 8)
90#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
91
92static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
93{
94 int fan_nr = to_sensor_dev_attr(attr)->index;
95 struct env *p = dev_get_drvdata(dev);
96 int rpm, period;
97 u8 val;
98
99 val = env_read(p, IREG_FAN0 + fan_nr);
100 period = (int) val << 8;
101 if (FAN_DATA_VALID(period))
102 rpm = FAN_PERIOD_TO_RPM(period);
103 else
104 rpm = 0;
105
106 return sprintf(buf, "%d\n", rpm);
107}
108
109static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
110 const char *buf, size_t count)
111{
112 int fan_nr = to_sensor_dev_attr(attr)->index;
113 int rpm = simple_strtol(buf, NULL, 10);
114 struct env *p = dev_get_drvdata(dev);
115 int period;
116 u8 val;
117
118 if (!rpm)
119 return -EINVAL;
120
121 period = FAN_RPM_TO_PERIOD(rpm);
122 val = period >> 8;
123 env_write(p, IREG_FAN0 + fan_nr, val);
124
125 return count;
126}
127
128static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, char *buf)
129{
130 int fan_nr = to_sensor_dev_attr(attr)->index;
131 struct env *p = dev_get_drvdata(dev);
132 u8 val = env_read(p, IREG_FAN_STAT);
133 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
134}
135
136#define fan(index) \
137static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \
138 show_fan_speed, set_fan_speed, index); \
139static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \
140 show_fan_fault, NULL, index)
141
142fan(0);
143fan(1);
144fan(2);
145fan(3);
146fan(4);
147
148static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
149
150static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
151{
152 int temp_nr = to_sensor_dev_attr(attr)->index;
153 struct env *p = dev_get_drvdata(dev);
154 s8 val;
155
156 val = env_read(p, IREG_LCL_TEMP + temp_nr);
157 return sprintf(buf, "%d\n", ((int) val) - 64);
158}
159
160static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
161static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
162static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
163static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
164static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
165static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
166static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
167static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
168static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
169
170static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, char *buf)
171{
172 int index = to_sensor_dev_attr(attr)->index;
173 struct env *p = dev_get_drvdata(dev);
174 u8 val;
175
176 val = readb(p->regs + REG_STAT);
177 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
178}
179
180static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
181static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
182static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
183static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 3);
184
185static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, char *buf)
186{
187 struct env *p = dev_get_drvdata(dev);
188 u8 val;
189
190 val = readb(p->regs + REG_STAT);
191 return sprintf(buf, "%d\n", val >> 4);
192}
193
194static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
195
196static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
197{
198 return sprintf(buf, "ultra45\n");
199}
200
201static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
202
203static struct attribute *env_attributes[] = {
204 &sensor_dev_attr_fan0_speed.dev_attr.attr,
205 &sensor_dev_attr_fan0_fault.dev_attr.attr,
206 &sensor_dev_attr_fan1_speed.dev_attr.attr,
207 &sensor_dev_attr_fan1_fault.dev_attr.attr,
208 &sensor_dev_attr_fan2_speed.dev_attr.attr,
209 &sensor_dev_attr_fan2_fault.dev_attr.attr,
210 &sensor_dev_attr_fan3_speed.dev_attr.attr,
211 &sensor_dev_attr_fan3_fault.dev_attr.attr,
212 &sensor_dev_attr_fan4_speed.dev_attr.attr,
213 &sensor_dev_attr_fan4_fault.dev_attr.attr,
214 &sensor_dev_attr_psu_fan_fault.dev_attr.attr,
215 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
216 &sensor_dev_attr_cpu0_temp.dev_attr.attr,
217 &sensor_dev_attr_cpu1_temp.dev_attr.attr,
218 &sensor_dev_attr_motherboard_temp.dev_attr.attr,
219 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
220 &sensor_dev_attr_fire_temp.dev_attr.attr,
221 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
222 &sensor_dev_attr_front_panel_temp.dev_attr.attr,
223 &sensor_dev_attr_psu_temp.dev_attr.attr,
224 &sensor_dev_attr_fan_failure.dev_attr.attr,
225 &sensor_dev_attr_env_bus_busy.dev_attr.attr,
226 &sensor_dev_attr_env_data_stale.dev_attr.attr,
227 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
228 &sensor_dev_attr_firmware_version.dev_attr.attr,
229 &sensor_dev_attr_name.dev_attr.attr,
230 NULL,
231};
232
233static const struct attribute_group env_group = {
234 .attrs = env_attributes,
235};
236
Grant Likely2dc11582010-08-06 09:25:50 -0600237static int __devinit env_probe(struct platform_device *op,
David S. Millere0418082008-08-24 20:59:49 -0700238 const struct of_device_id *match)
239{
240 struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
241 int err = -ENOMEM;
242
243 if (!p)
244 goto out;
245
246 spin_lock_init(&p->lock);
247
248 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
249 if (!p->regs)
250 goto out_free;
251
252 err = sysfs_create_group(&op->dev.kobj, &env_group);
253 if (err)
254 goto out_iounmap;
255
256 p->hwmon_dev = hwmon_device_register(&op->dev);
257 if (IS_ERR(p->hwmon_dev)) {
258 err = PTR_ERR(p->hwmon_dev);
259 goto out_sysfs_remove_group;
260 }
261
262 dev_set_drvdata(&op->dev, p);
263 err = 0;
264
265out:
266 return err;
267
268out_sysfs_remove_group:
269 sysfs_remove_group(&op->dev.kobj, &env_group);
270
271out_iounmap:
272 of_iounmap(&op->resource[0], p->regs, REG_SIZE);
273
274out_free:
275 kfree(p);
276 goto out;
277}
278
Grant Likely2dc11582010-08-06 09:25:50 -0600279static int __devexit env_remove(struct platform_device *op)
David S. Millere0418082008-08-24 20:59:49 -0700280{
281 struct env *p = dev_get_drvdata(&op->dev);
282
283 if (p) {
284 sysfs_remove_group(&op->dev.kobj, &env_group);
285 hwmon_device_unregister(p->hwmon_dev);
286 of_iounmap(&op->resource[0], p->regs, REG_SIZE);
287 kfree(p);
288 }
289
290 return 0;
291}
292
David S. Millerfd098312008-08-31 01:23:17 -0700293static const struct of_device_id env_match[] = {
David S. Millere0418082008-08-24 20:59:49 -0700294 {
295 .name = "env-monitor",
296 .compatible = "SUNW,ebus-pic16f747-env",
297 },
298 {},
299};
300MODULE_DEVICE_TABLE(of, env_match);
301
302static struct of_platform_driver env_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700303 .driver = {
304 .name = "ultra45_env",
305 .owner = THIS_MODULE,
306 .of_match_table = env_match,
307 },
David S. Millere0418082008-08-24 20:59:49 -0700308 .probe = env_probe,
309 .remove = __devexit_p(env_remove),
310};
311
312static int __init env_init(void)
313{
Grant Likely1ab1d632010-06-24 15:14:37 -0600314 return of_register_platform_driver(&env_driver);
David S. Millere0418082008-08-24 20:59:49 -0700315}
316
317static void __exit env_exit(void)
318{
Grant Likely1ab1d632010-06-24 15:14:37 -0600319 of_unregister_platform_driver(&env_driver);
David S. Millere0418082008-08-24 20:59:49 -0700320}
321
322module_init(env_init);
323module_exit(env_exit);