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1 | /* |
2 | smsc47b397.c - Part of lm_sensors, Linux kernel modules |
3 | for hardware monitoring |
4 | |
5 | Supports the SMSC LPC47B397-NC Super-I/O chip. |
6 | |
7 | Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com> |
8 | Copyright (C) 2004 Utilitek Systems, Inc. |
9 | |
10 | derived in part from smsc47m1.c: |
11 | Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> |
12 | Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> |
13 | |
14 | This program is free software; you can redistribute it and/or modify |
15 | it under the terms of the GNU General Public License as published by |
16 | the Free Software Foundation; either version 2 of the License, or |
17 | (at your option) any later version. |
18 | |
19 | This program is distributed in the hope that it will be useful, |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | GNU General Public License for more details. |
23 | |
24 | You should have received a copy of the GNU General Public License |
25 | along with this program; if not, write to the Free Software |
26 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
27 | */ |
28 | |
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 <linux/io.h> |
41 | |
42 | static unsigned short force_id; |
43 | module_param(force_id, ushort, 0); |
44 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); |
45 | |
46 | static struct platform_device *pdev; |
47 | |
48 | #define DRVNAME "smsc47b397" |
49 | |
50 | /* Super-I/0 registers and commands */ |
51 | |
52 | #define REG 0x2e /* The register to read/write */ |
53 | #define VAL 0x2f /* The value to read/write */ |
54 | |
55 | static inline void superio_outb(int reg, int val) |
56 | { |
57 | outb(reg, REG); |
58 | outb(val, VAL); |
59 | } |
60 | |
61 | static inline int superio_inb(int reg) |
62 | { |
63 | outb(reg, REG); |
64 | return inb(VAL); |
65 | } |
66 | |
67 | /* select superio logical device */ |
68 | static inline void superio_select(int ld) |
69 | { |
70 | superio_outb(0x07, ld); |
71 | } |
72 | |
73 | static inline void superio_enter(void) |
74 | { |
75 | outb(0x55, REG); |
76 | } |
77 | |
78 | static 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 | /* 0 <= nr <= 3 */ |
92 | static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; |
93 | #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) |
94 | |
95 | /* 0 <= nr <= 3 */ |
96 | #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) |
97 | #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) |
98 | |
99 | struct 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; /* in jiffies */ |
107 | int valid; |
108 | |
109 | /* register values */ |
110 | u16 fan[4]; |
111 | u8 temp[4]; |
112 | }; |
113 | |
114 | static 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 | |
125 | static 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 | /* 4 temperature inputs, 4 fan inputs */ |
136 | for (i = 0; i < 4; i++) { |
137 | data->temp[i] = smsc47b397_read_value(data, |
138 | SMSC47B397_REG_TEMP(i)); |
139 | |
140 | /* must read LSB first */ |
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 | /* TEMP: 0.001C/bit (-128C to +127C) |
159 | REG: 1C/bit, two's complement */ |
160 | static int temp_from_reg(u8 reg) |
161 | { |
162 | return (s8)reg * 1000; |
163 | } |
164 | |
165 | static 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 | |
173 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
174 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
175 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); |
176 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); |
177 | |
178 | /* FAN: 1 RPM/bit |
179 | REG: count of 90kHz pulses / revolution */ |
180 | static int fan_from_reg(u16 reg) |
181 | { |
182 | if (reg == 0 || reg == 0xffff) |
183 | return 0; |
184 | return 90000 * 60 / reg; |
185 | } |
186 | |
187 | static 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 | } |
194 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); |
195 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); |
196 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); |
197 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); |
198 | |
199 | static 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 | } |
205 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
206 | |
207 | static 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 | |
221 | static const struct attribute_group smsc47b397_group = { |
222 | .attrs = smsc47b397_attributes, |
223 | }; |
224 | |
225 | static 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 | |
239 | static int smsc47b397_probe(struct platform_device *pdev); |
240 | |
241 | static 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 | |
250 | static 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 | |
288 | error_remove: |
289 | sysfs_remove_group(&dev->kobj, &smsc47b397_group); |
290 | error_free: |
291 | kfree(data); |
292 | error_release: |
293 | release_region(res->start, SMSC_EXTENT); |
294 | return err; |
295 | } |
296 | |
297 | static 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 | |
334 | exit_device_put: |
335 | platform_device_put(pdev); |
336 | exit: |
337 | return err; |
338 | } |
339 | |
340 | static 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 | |
378 | static 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 | /* Sets global pdev as a side effect */ |
391 | ret = smsc47b397_device_add(address); |
392 | if (ret) |
393 | goto exit_driver; |
394 | |
395 | return 0; |
396 | |
397 | exit_driver: |
398 | platform_driver_unregister(&smsc47b397_driver); |
399 | exit: |
400 | return ret; |
401 | } |
402 | |
403 | static void __exit smsc47b397_exit(void) |
404 | { |
405 | platform_device_unregister(pdev); |
406 | platform_driver_unregister(&smsc47b397_driver); |
407 | } |
408 | |
409 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); |
410 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); |
411 | MODULE_LICENSE("GPL"); |
412 | |
413 | module_init(smsc47b397_init); |
414 | module_exit(smsc47b397_exit); |
415 |
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