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Linux/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 #include <linux/err.h>
 16 
 17 #define DRV_MODULE_VERSION      "0.1"
 18 
 19 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
 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 env_probe(struct platform_device *op)
254 {
255         struct env *p = devm_kzalloc(&op->dev, 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;
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         goto out;
290 }
291 
292 static int env_remove(struct platform_device *op)
293 {
294         struct env *p = platform_get_drvdata(op);
295 
296         if (p) {
297                 sysfs_remove_group(&op->dev.kobj, &env_group);
298                 hwmon_device_unregister(p->hwmon_dev);
299                 of_iounmap(&op->resource[0], p->regs, REG_SIZE);
300         }
301 
302         return 0;
303 }
304 
305 static const struct of_device_id env_match[] = {
306         {
307                 .name = "env-monitor",
308                 .compatible = "SUNW,ebus-pic16f747-env",
309         },
310         {},
311 };
312 MODULE_DEVICE_TABLE(of, env_match);
313 
314 static struct platform_driver env_driver = {
315         .driver = {
316                 .name = "ultra45_env",
317                 .owner = THIS_MODULE,
318                 .of_match_table = env_match,
319         },
320         .probe          = env_probe,
321         .remove         = env_remove,
322 };
323 
324 module_platform_driver(env_driver);
325 

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