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