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29#include <linux/module.h>
30#include <linux/slab.h>
31#include <linux/ioport.h>
32#include <linux/jiffies.h>
33#include <linux/platform_device.h>
34#include <linux/hwmon.h>
35#include <linux/hwmon-sysfs.h>
36#include <linux/err.h>
37#include <linux/init.h>
38#include <linux/mutex.h>
39#include <linux/acpi.h>
40#include <asm/io.h>
41
42static unsigned short force_id;
43module_param(force_id, ushort, 0);
44MODULE_PARM_DESC(force_id, "Override the detected device ID");
45
46static struct platform_device *pdev;
47
48#define DRVNAME "smsc47b397"
49
50
51
52#define REG 0x2e
53#define VAL 0x2f
54
55static inline void superio_outb(int reg, int val)
56{
57 outb(reg, REG);
58 outb(val, VAL);
59}
60
61static inline int superio_inb(int reg)
62{
63 outb(reg, REG);
64 return inb(VAL);
65}
66
67
68static inline void superio_select(int ld)
69{
70 superio_outb(0x07, ld);
71}
72
73static inline void superio_enter(void)
74{
75 outb(0x55, REG);
76}
77
78static inline void superio_exit(void)
79{
80 outb(0xAA, REG);
81}
82
83#define SUPERIO_REG_DEVID 0x20
84#define SUPERIO_REG_DEVREV 0x21
85#define SUPERIO_REG_BASE_MSB 0x60
86#define SUPERIO_REG_BASE_LSB 0x61
87#define SUPERIO_REG_LD8 0x08
88
89#define SMSC_EXTENT 0x02
90
91
92static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
93#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
94
95
96#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
97#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
98
99struct smsc47b397_data {
100 unsigned short addr;
101 const char *name;
102 struct device *hwmon_dev;
103 struct mutex lock;
104
105 struct mutex update_lock;
106 unsigned long last_updated;
107 int valid;
108
109
110 u16 fan[4];
111 u8 temp[4];
112};
113
114static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
115{
116 int res;
117
118 mutex_lock(&data->lock);
119 outb(reg, data->addr);
120 res = inb_p(data->addr + 1);
121 mutex_unlock(&data->lock);
122 return res;
123}
124
125static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
126{
127 struct smsc47b397_data *data = dev_get_drvdata(dev);
128 int i;
129
130 mutex_lock(&data->update_lock);
131
132 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
133 dev_dbg(dev, "starting device update...\n");
134
135
136 for (i = 0; i < 4; i++) {
137 data->temp[i] = smsc47b397_read_value(data,
138 SMSC47B397_REG_TEMP(i));
139
140
141 data->fan[i] = smsc47b397_read_value(data,
142 SMSC47B397_REG_FAN_LSB(i));
143 data->fan[i] |= smsc47b397_read_value(data,
144 SMSC47B397_REG_FAN_MSB(i)) << 8;
145 }
146
147 data->last_updated = jiffies;
148 data->valid = 1;
149
150 dev_dbg(dev, "... device update complete\n");
151 }
152
153 mutex_unlock(&data->update_lock);
154
155 return data;
156}
157
158
159
160static int temp_from_reg(u8 reg)
161{
162 return (s8)reg * 1000;
163}
164
165static ssize_t show_temp(struct device *dev, struct device_attribute
166 *devattr, char *buf)
167{
168 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
169 struct smsc47b397_data *data = smsc47b397_update_device(dev);
170 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
171}
172
173static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
174static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
175static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
176static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
177
178
179
180static int fan_from_reg(u16 reg)
181{
182 if (reg == 0 || reg == 0xffff)
183 return 0;
184 return 90000 * 60 / reg;
185}
186
187static ssize_t show_fan(struct device *dev, struct device_attribute
188 *devattr, char *buf)
189{
190 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
191 struct smsc47b397_data *data = smsc47b397_update_device(dev);
192 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
193}
194static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
195static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
196static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
197static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
198
199static ssize_t show_name(struct device *dev, struct device_attribute
200 *devattr, char *buf)
201{
202 struct smsc47b397_data *data = dev_get_drvdata(dev);
203 return sprintf(buf, "%s\n", data->name);
204}
205static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
206
207static struct attribute *smsc47b397_attributes[] = {
208 &sensor_dev_attr_temp1_input.dev_attr.attr,
209 &sensor_dev_attr_temp2_input.dev_attr.attr,
210 &sensor_dev_attr_temp3_input.dev_attr.attr,
211 &sensor_dev_attr_temp4_input.dev_attr.attr,
212 &sensor_dev_attr_fan1_input.dev_attr.attr,
213 &sensor_dev_attr_fan2_input.dev_attr.attr,
214 &sensor_dev_attr_fan3_input.dev_attr.attr,
215 &sensor_dev_attr_fan4_input.dev_attr.attr,
216
217 &dev_attr_name.attr,
218 NULL
219};
220
221static const struct attribute_group smsc47b397_group = {
222 .attrs = smsc47b397_attributes,
223};
224
225static int __devexit smsc47b397_remove(struct platform_device *pdev)
226{
227 struct smsc47b397_data *data = platform_get_drvdata(pdev);
228 struct resource *res;
229
230 hwmon_device_unregister(data->hwmon_dev);
231 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
232 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
233 release_region(res->start, SMSC_EXTENT);
234 kfree(data);
235
236 return 0;
237}
238
239static int smsc47b397_probe(struct platform_device *pdev);
240
241static struct platform_driver smsc47b397_driver = {
242 .driver = {
243 .owner = THIS_MODULE,
244 .name = DRVNAME,
245 },
246 .probe = smsc47b397_probe,
247 .remove = __devexit_p(smsc47b397_remove),
248};
249
250static int __devinit smsc47b397_probe(struct platform_device *pdev)
251{
252 struct device *dev = &pdev->dev;
253 struct smsc47b397_data *data;
254 struct resource *res;
255 int err = 0;
256
257 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
258 if (!request_region(res->start, SMSC_EXTENT,
259 smsc47b397_driver.driver.name)) {
260 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
261 (unsigned long)res->start,
262 (unsigned long)res->start + SMSC_EXTENT - 1);
263 return -EBUSY;
264 }
265
266 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
267 err = -ENOMEM;
268 goto error_release;
269 }
270
271 data->addr = res->start;
272 data->name = "smsc47b397";
273 mutex_init(&data->lock);
274 mutex_init(&data->update_lock);
275 platform_set_drvdata(pdev, data);
276
277 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
278 goto error_free;
279
280 data->hwmon_dev = hwmon_device_register(dev);
281 if (IS_ERR(data->hwmon_dev)) {
282 err = PTR_ERR(data->hwmon_dev);
283 goto error_remove;
284 }
285
286 return 0;
287
288error_remove:
289 sysfs_remove_group(&dev->kobj, &smsc47b397_group);
290error_free:
291 kfree(data);
292error_release:
293 release_region(res->start, SMSC_EXTENT);
294 return err;
295}
296
297static int __init smsc47b397_device_add(unsigned short address)
298{
299 struct resource res = {
300 .start = address,
301 .end = address + SMSC_EXTENT - 1,
302 .name = DRVNAME,
303 .flags = IORESOURCE_IO,
304 };
305 int err;
306
307 err = acpi_check_resource_conflict(&res);
308 if (err)
309 goto exit;
310
311 pdev = platform_device_alloc(DRVNAME, address);
312 if (!pdev) {
313 err = -ENOMEM;
314 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
315 goto exit;
316 }
317
318 err = platform_device_add_resources(pdev, &res, 1);
319 if (err) {
320 printk(KERN_ERR DRVNAME ": Device resource addition failed "
321 "(%d)\n", err);
322 goto exit_device_put;
323 }
324
325 err = platform_device_add(pdev);
326 if (err) {
327 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
328 err);
329 goto exit_device_put;
330 }
331
332 return 0;
333
334exit_device_put:
335 platform_device_put(pdev);
336exit:
337 return err;
338}
339
340static int __init smsc47b397_find(unsigned short *addr)
341{
342 u8 id, rev;
343 char *name;
344
345 superio_enter();
346 id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
347
348 switch(id) {
349 case 0x81:
350 name = "SCH5307-NS";
351 break;
352 case 0x6f:
353 name = "LPC47B397-NC";
354 break;
355 case 0x85:
356 case 0x8c:
357 name = "SCH5317";
358 break;
359 default:
360 superio_exit();
361 return -ENODEV;
362 }
363
364 rev = superio_inb(SUPERIO_REG_DEVREV);
365
366 superio_select(SUPERIO_REG_LD8);
367 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
368 | superio_inb(SUPERIO_REG_BASE_LSB);
369
370 printk(KERN_INFO DRVNAME ": found SMSC %s "
371 "(base address 0x%04x, revision %u)\n",
372 name, *addr, rev);
373
374 superio_exit();
375 return 0;
376}
377
378static int __init smsc47b397_init(void)
379{
380 unsigned short address;
381 int ret;
382
383 if ((ret = smsc47b397_find(&address)))
384 return ret;
385
386 ret = platform_driver_register(&smsc47b397_driver);
387 if (ret)
388 goto exit;
389
390
391 ret = smsc47b397_device_add(address);
392 if (ret)
393 goto exit_driver;
394
395 return 0;
396
397exit_driver:
398 platform_driver_unregister(&smsc47b397_driver);
399exit:
400 return ret;
401}
402
403static void __exit smsc47b397_exit(void)
404{
405 platform_device_unregister(pdev);
406 platform_driver_unregister(&smsc47b397_driver);
407}
408
409MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
410MODULE_DESCRIPTION("SMSC LPC47B397 driver");
411MODULE_LICENSE("GPL");
412
413module_init(smsc47b397_init);
414module_exit(smsc47b397_exit);
415
