Root/
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 | #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 | |
44 | static unsigned short force_id; |
45 | module_param(force_id, ushort, 0); |
46 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); |
47 | |
48 | static struct platform_device *pdev; |
49 | |
50 | #define DRVNAME "smsc47b397" |
51 | |
52 | /* Super-I/0 registers and commands */ |
53 | |
54 | #define REG 0x2e /* The register to read/write */ |
55 | #define VAL 0x2f /* The value to read/write */ |
56 | |
57 | static inline void superio_outb(int reg, int val) |
58 | { |
59 | outb(reg, REG); |
60 | outb(val, VAL); |
61 | } |
62 | |
63 | static inline int superio_inb(int reg) |
64 | { |
65 | outb(reg, REG); |
66 | return inb(VAL); |
67 | } |
68 | |
69 | /* select superio logical device */ |
70 | static inline void superio_select(int ld) |
71 | { |
72 | superio_outb(0x07, ld); |
73 | } |
74 | |
75 | static inline void superio_enter(void) |
76 | { |
77 | outb(0x55, REG); |
78 | } |
79 | |
80 | static 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 | /* 0 <= nr <= 3 */ |
94 | static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; |
95 | #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) |
96 | |
97 | /* 0 <= nr <= 3 */ |
98 | #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) |
99 | #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) |
100 | |
101 | struct 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; /* in jiffies */ |
109 | int valid; |
110 | |
111 | /* register values */ |
112 | u16 fan[4]; |
113 | u8 temp[4]; |
114 | }; |
115 | |
116 | static 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 | |
127 | static 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 | /* 4 temperature inputs, 4 fan inputs */ |
138 | for (i = 0; i < 4; i++) { |
139 | data->temp[i] = smsc47b397_read_value(data, |
140 | SMSC47B397_REG_TEMP(i)); |
141 | |
142 | /* must read LSB first */ |
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 | * TEMP: 0.001C/bit (-128C to +127C) |
162 | * REG: 1C/bit, two's complement |
163 | */ |
164 | static int temp_from_reg(u8 reg) |
165 | { |
166 | return (s8)reg * 1000; |
167 | } |
168 | |
169 | static 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 | |
177 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
178 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
179 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); |
180 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); |
181 | |
182 | /* |
183 | * FAN: 1 RPM/bit |
184 | * REG: count of 90kHz pulses / revolution |
185 | */ |
186 | static int fan_from_reg(u16 reg) |
187 | { |
188 | if (reg == 0 || reg == 0xffff) |
189 | return 0; |
190 | return 90000 * 60 / reg; |
191 | } |
192 | |
193 | static 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 | } |
200 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); |
201 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); |
202 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); |
203 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); |
204 | |
205 | static 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 | } |
211 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
212 | |
213 | static 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 | |
227 | static const struct attribute_group smsc47b397_group = { |
228 | .attrs = smsc47b397_attributes, |
229 | }; |
230 | |
231 | static 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 | |
241 | static int smsc47b397_probe(struct platform_device *pdev); |
242 | |
243 | static 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 | |
252 | static 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 | |
290 | error_remove: |
291 | sysfs_remove_group(&dev->kobj, &smsc47b397_group); |
292 | return err; |
293 | } |
294 | |
295 | static 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 | |
330 | exit_device_put: |
331 | platform_device_put(pdev); |
332 | exit: |
333 | return err; |
334 | } |
335 | |
336 | static 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 | |
374 | static 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 | /* Sets global pdev as a side effect */ |
389 | ret = smsc47b397_device_add(address); |
390 | if (ret) |
391 | goto exit_driver; |
392 | |
393 | return 0; |
394 | |
395 | exit_driver: |
396 | platform_driver_unregister(&smsc47b397_driver); |
397 | exit: |
398 | return ret; |
399 | } |
400 | |
401 | static void __exit smsc47b397_exit(void) |
402 | { |
403 | platform_device_unregister(pdev); |
404 | platform_driver_unregister(&smsc47b397_driver); |
405 | } |
406 | |
407 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); |
408 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); |
409 | MODULE_LICENSE("GPL"); |
410 | |
411 | module_init(smsc47b397_init); |
412 | module_exit(smsc47b397_exit); |
413 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9