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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 <asm/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); |