blob: 8663bbbe97f5a5cb287e61c61b7758bd38d4f491 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/i2c.h>
Jean Delvarefde09502005-07-19 23:51:07 +020034#include <linux/i2c-isa.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040035#include <linux/hwmon.h>
36#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/init.h>
38#include <asm/io.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040/* Address is autodetected, there is no default value */
Jean Delvare2d8672c2005-07-19 23:56:35 +020041static unsigned short address;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43/* Super-I/0 registers and commands */
44
45#define REG 0x2e /* The register to read/write */
46#define VAL 0x2f /* The value to read/write */
47
48static inline void superio_outb(int reg, int val)
49{
50 outb(reg, REG);
51 outb(val, VAL);
52}
53
54static inline int superio_inb(int reg)
55{
56 outb(reg, REG);
57 return inb(VAL);
58}
59
60/* select superio logical device */
61static inline void superio_select(int ld)
62{
63 superio_outb(0x07, ld);
64}
65
66static inline void superio_enter(void)
67{
68 outb(0x55, REG);
69}
70
71static inline void superio_exit(void)
72{
73 outb(0xAA, REG);
74}
75
76#define SUPERIO_REG_DEVID 0x20
77#define SUPERIO_REG_DEVREV 0x21
78#define SUPERIO_REG_BASE_MSB 0x60
79#define SUPERIO_REG_BASE_LSB 0x61
80#define SUPERIO_REG_LD8 0x08
81
82#define SMSC_EXTENT 0x02
83
84/* 0 <= nr <= 3 */
85static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
86#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
87
88/* 0 <= nr <= 3 */
89#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
90#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
91
92struct smsc47b397_data {
93 struct i2c_client client;
Mark M. Hoffman943b0832005-07-15 21:39:18 -040094 struct class_device *class_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct semaphore lock;
96
97 struct semaphore update_lock;
98 unsigned long last_updated; /* in jiffies */
99 int valid;
100
101 /* register values */
102 u16 fan[4];
103 u8 temp[4];
104};
105
106static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
107{
108 struct smsc47b397_data *data = i2c_get_clientdata(client);
109 int res;
110
111 down(&data->lock);
112 outb(reg, client->addr);
113 res = inb_p(client->addr + 1);
114 up(&data->lock);
115 return res;
116}
117
118static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
119{
120 struct i2c_client *client = to_i2c_client(dev);
121 struct smsc47b397_data *data = i2c_get_clientdata(client);
122 int i;
123
124 down(&data->update_lock);
125
126 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
127 dev_dbg(&client->dev, "starting device update...\n");
128
129 /* 4 temperature inputs, 4 fan inputs */
130 for (i = 0; i < 4; i++) {
131 data->temp[i] = smsc47b397_read_value(client,
132 SMSC47B397_REG_TEMP(i));
133
134 /* must read LSB first */
135 data->fan[i] = smsc47b397_read_value(client,
136 SMSC47B397_REG_FAN_LSB(i));
137 data->fan[i] |= smsc47b397_read_value(client,
138 SMSC47B397_REG_FAN_MSB(i)) << 8;
139 }
140
141 data->last_updated = jiffies;
142 data->valid = 1;
143
144 dev_dbg(&client->dev, "... device update complete\n");
145 }
146
147 up(&data->update_lock);
148
149 return data;
150}
151
152/* TEMP: 0.001C/bit (-128C to +127C)
153 REG: 1C/bit, two's complement */
154static int temp_from_reg(u8 reg)
155{
156 return (s8)reg * 1000;
157}
158
159/* 0 <= nr <= 3 */
160static ssize_t show_temp(struct device *dev, char *buf, int nr)
161{
162 struct smsc47b397_data *data = smsc47b397_update_device(dev);
163 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
164}
165
166#define sysfs_temp(num) \
Yani Ioannoua5099cf2005-05-17 06:42:25 -0400167static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{ \
169 return show_temp(dev, buf, num-1); \
170} \
171static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
172
173sysfs_temp(1);
174sysfs_temp(2);
175sysfs_temp(3);
176sysfs_temp(4);
177
178#define device_create_file_temp(client, num) \
179 device_create_file(&client->dev, &dev_attr_temp##num##_input)
180
181/* FAN: 1 RPM/bit
182 REG: count of 90kHz pulses / revolution */
183static int fan_from_reg(u16 reg)
184{
185 return 90000 * 60 / reg;
186}
187
188/* 0 <= nr <= 3 */
189static ssize_t show_fan(struct device *dev, char *buf, int nr)
190{
191 struct smsc47b397_data *data = smsc47b397_update_device(dev);
192 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
193}
194
195#define sysfs_fan(num) \
Yani Ioannoua5099cf2005-05-17 06:42:25 -0400196static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{ \
198 return show_fan(dev, buf, num-1); \
199} \
200static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
201
202sysfs_fan(1);
203sysfs_fan(2);
204sysfs_fan(3);
205sysfs_fan(4);
206
207#define device_create_file_fan(client, num) \
208 device_create_file(&client->dev, &dev_attr_fan##num##_input)
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210static int smsc47b397_detach_client(struct i2c_client *client)
211{
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400212 struct smsc47b397_data *data = i2c_get_clientdata(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 int err;
214
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400215 hwmon_device_unregister(data->class_dev);
216
Jean Delvare7bef5592005-07-27 22:14:49 +0200217 if ((err = i2c_detach_client(client)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 release_region(client->addr, SMSC_EXTENT);
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400221 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 return 0;
224}
225
Jean Delvare2d8672c2005-07-19 23:56:35 +0200226static int smsc47b397_detect(struct i2c_adapter *adapter);
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static struct i2c_driver smsc47b397_driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100229 .driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100230 .name = "smsc47b397",
231 },
Jean Delvare2d8672c2005-07-19 23:56:35 +0200232 .attach_adapter = smsc47b397_detect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 .detach_client = smsc47b397_detach_client,
234};
235
Jean Delvare2d8672c2005-07-19 23:56:35 +0200236static int smsc47b397_detect(struct i2c_adapter *adapter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 struct i2c_client *new_client;
239 struct smsc47b397_data *data;
240 int err = 0;
241
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100242 if (!request_region(address, SMSC_EXTENT,
243 smsc47b397_driver.driver.name)) {
Jean Delvare2d8672c2005-07-19 23:56:35 +0200244 dev_err(&adapter->dev, "Region 0x%x already in use!\n",
245 address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return -EBUSY;
247 }
248
Deepak Saxenaba9c2e82005-10-17 23:08:32 +0200249 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 err = -ENOMEM;
251 goto error_release;
252 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 new_client = &data->client;
255 i2c_set_clientdata(new_client, data);
Jean Delvare2d8672c2005-07-19 23:56:35 +0200256 new_client->addr = address;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 init_MUTEX(&data->lock);
258 new_client->adapter = adapter;
259 new_client->driver = &smsc47b397_driver;
260 new_client->flags = 0;
261
262 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
263
264 init_MUTEX(&data->update_lock);
265
266 if ((err = i2c_attach_client(new_client)))
267 goto error_free;
268
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400269 data->class_dev = hwmon_device_register(&new_client->dev);
270 if (IS_ERR(data->class_dev)) {
271 err = PTR_ERR(data->class_dev);
272 goto error_detach;
273 }
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 device_create_file_temp(new_client, 1);
276 device_create_file_temp(new_client, 2);
277 device_create_file_temp(new_client, 3);
278 device_create_file_temp(new_client, 4);
279
280 device_create_file_fan(new_client, 1);
281 device_create_file_fan(new_client, 2);
282 device_create_file_fan(new_client, 3);
283 device_create_file_fan(new_client, 4);
284
285 return 0;
286
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400287error_detach:
288 i2c_detach_client(new_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289error_free:
Alexey Dobriyan1f57ff82005-08-26 01:49:14 +0400290 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291error_release:
Jean Delvare2d8672c2005-07-19 23:56:35 +0200292 release_region(address, SMSC_EXTENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 return err;
294}
295
Jean Delvare2d8672c2005-07-19 23:56:35 +0200296static int __init smsc47b397_find(unsigned short *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
298 u8 id, rev;
299
300 superio_enter();
301 id = superio_inb(SUPERIO_REG_DEVID);
302
Mark M. Hoffman7ab83a92005-10-17 23:01:45 +0200303 if ((id != 0x6f) && (id != 0x81)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 superio_exit();
305 return -ENODEV;
306 }
307
308 rev = superio_inb(SUPERIO_REG_DEVREV);
309
310 superio_select(SUPERIO_REG_LD8);
311 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
312 | superio_inb(SUPERIO_REG_BASE_LSB);
313
Mark M. Hoffman7ab83a92005-10-17 23:01:45 +0200314 printk(KERN_INFO "smsc47b397: found SMSC %s "
315 "(base address 0x%04x, revision %u)\n",
316 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318 superio_exit();
319 return 0;
320}
321
322static int __init smsc47b397_init(void)
323{
324 int ret;
325
Jean Delvare2d8672c2005-07-19 23:56:35 +0200326 if ((ret = smsc47b397_find(&address)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return ret;
328
Jean Delvarefde09502005-07-19 23:51:07 +0200329 return i2c_isa_add_driver(&smsc47b397_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332static void __exit smsc47b397_exit(void)
333{
Jean Delvarefde09502005-07-19 23:51:07 +0200334 i2c_isa_del_driver(&smsc47b397_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
337MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
338MODULE_DESCRIPTION("SMSC LPC47B397 driver");
339MODULE_LICENSE("GPL");
340
341module_init(smsc47b397_init);
342module_exit(smsc47b397_exit);