Commit | Line | Data |
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1da177e4 LT |
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/i2c.h> | |
fde09509 | 34 | #include <linux/i2c-isa.h> |
943b0830 MH |
35 | #include <linux/hwmon.h> |
36 | #include <linux/err.h> | |
1da177e4 | 37 | #include <linux/init.h> |
9a61bf63 | 38 | #include <linux/mutex.h> |
1da177e4 LT |
39 | #include <asm/io.h> |
40 | ||
1da177e4 | 41 | /* Address is autodetected, there is no default value */ |
2d8672c5 | 42 | static unsigned short address; |
1da177e4 LT |
43 | |
44 | /* Super-I/0 registers and commands */ | |
45 | ||
46 | #define REG 0x2e /* The register to read/write */ | |
47 | #define VAL 0x2f /* The value to read/write */ | |
48 | ||
49 | static inline void superio_outb(int reg, int val) | |
50 | { | |
51 | outb(reg, REG); | |
52 | outb(val, VAL); | |
53 | } | |
54 | ||
55 | static inline int superio_inb(int reg) | |
56 | { | |
57 | outb(reg, REG); | |
58 | return inb(VAL); | |
59 | } | |
60 | ||
61 | /* select superio logical device */ | |
62 | static inline void superio_select(int ld) | |
63 | { | |
64 | superio_outb(0x07, ld); | |
65 | } | |
66 | ||
67 | static inline void superio_enter(void) | |
68 | { | |
69 | outb(0x55, REG); | |
70 | } | |
71 | ||
72 | static inline void superio_exit(void) | |
73 | { | |
74 | outb(0xAA, REG); | |
75 | } | |
76 | ||
77 | #define SUPERIO_REG_DEVID 0x20 | |
78 | #define SUPERIO_REG_DEVREV 0x21 | |
79 | #define SUPERIO_REG_BASE_MSB 0x60 | |
80 | #define SUPERIO_REG_BASE_LSB 0x61 | |
81 | #define SUPERIO_REG_LD8 0x08 | |
82 | ||
83 | #define SMSC_EXTENT 0x02 | |
84 | ||
85 | /* 0 <= nr <= 3 */ | |
86 | static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; | |
87 | #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) | |
88 | ||
89 | /* 0 <= nr <= 3 */ | |
90 | #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) | |
91 | #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) | |
92 | ||
93 | struct smsc47b397_data { | |
94 | struct i2c_client client; | |
943b0830 | 95 | struct class_device *class_dev; |
9a61bf63 | 96 | struct mutex lock; |
1da177e4 | 97 | |
9a61bf63 | 98 | struct mutex update_lock; |
1da177e4 LT |
99 | unsigned long last_updated; /* in jiffies */ |
100 | int valid; | |
101 | ||
102 | /* register values */ | |
103 | u16 fan[4]; | |
104 | u8 temp[4]; | |
105 | }; | |
106 | ||
107 | static int smsc47b397_read_value(struct i2c_client *client, u8 reg) | |
108 | { | |
109 | struct smsc47b397_data *data = i2c_get_clientdata(client); | |
110 | int res; | |
111 | ||
9a61bf63 | 112 | mutex_lock(&data->lock); |
1da177e4 LT |
113 | outb(reg, client->addr); |
114 | res = inb_p(client->addr + 1); | |
9a61bf63 | 115 | mutex_unlock(&data->lock); |
1da177e4 LT |
116 | return res; |
117 | } | |
118 | ||
119 | static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) | |
120 | { | |
121 | struct i2c_client *client = to_i2c_client(dev); | |
122 | struct smsc47b397_data *data = i2c_get_clientdata(client); | |
123 | int i; | |
124 | ||
9a61bf63 | 125 | mutex_lock(&data->update_lock); |
1da177e4 LT |
126 | |
127 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
128 | dev_dbg(&client->dev, "starting device update...\n"); | |
129 | ||
130 | /* 4 temperature inputs, 4 fan inputs */ | |
131 | for (i = 0; i < 4; i++) { | |
132 | data->temp[i] = smsc47b397_read_value(client, | |
133 | SMSC47B397_REG_TEMP(i)); | |
134 | ||
135 | /* must read LSB first */ | |
136 | data->fan[i] = smsc47b397_read_value(client, | |
137 | SMSC47B397_REG_FAN_LSB(i)); | |
138 | data->fan[i] |= smsc47b397_read_value(client, | |
139 | SMSC47B397_REG_FAN_MSB(i)) << 8; | |
140 | } | |
141 | ||
142 | data->last_updated = jiffies; | |
143 | data->valid = 1; | |
144 | ||
145 | dev_dbg(&client->dev, "... device update complete\n"); | |
146 | } | |
147 | ||
9a61bf63 | 148 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
149 | |
150 | return data; | |
151 | } | |
152 | ||
153 | /* TEMP: 0.001C/bit (-128C to +127C) | |
154 | REG: 1C/bit, two's complement */ | |
155 | static int temp_from_reg(u8 reg) | |
156 | { | |
157 | return (s8)reg * 1000; | |
158 | } | |
159 | ||
160 | /* 0 <= nr <= 3 */ | |
161 | static ssize_t show_temp(struct device *dev, char *buf, int nr) | |
162 | { | |
163 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
164 | return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr])); | |
165 | } | |
166 | ||
167 | #define sysfs_temp(num) \ | |
a5099cfc | 168 | static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
169 | { \ |
170 | return show_temp(dev, buf, num-1); \ | |
171 | } \ | |
172 | static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) | |
173 | ||
174 | sysfs_temp(1); | |
175 | sysfs_temp(2); | |
176 | sysfs_temp(3); | |
177 | sysfs_temp(4); | |
178 | ||
179 | #define device_create_file_temp(client, num) \ | |
180 | device_create_file(&client->dev, &dev_attr_temp##num##_input) | |
181 | ||
182 | /* FAN: 1 RPM/bit | |
183 | REG: count of 90kHz pulses / revolution */ | |
184 | static int fan_from_reg(u16 reg) | |
185 | { | |
186 | return 90000 * 60 / reg; | |
187 | } | |
188 | ||
189 | /* 0 <= nr <= 3 */ | |
190 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
191 | { | |
192 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
193 | return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr])); | |
194 | } | |
195 | ||
196 | #define sysfs_fan(num) \ | |
a5099cfc | 197 | static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
198 | { \ |
199 | return show_fan(dev, buf, num-1); \ | |
200 | } \ | |
201 | static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) | |
202 | ||
203 | sysfs_fan(1); | |
204 | sysfs_fan(2); | |
205 | sysfs_fan(3); | |
206 | sysfs_fan(4); | |
207 | ||
208 | #define device_create_file_fan(client, num) \ | |
209 | device_create_file(&client->dev, &dev_attr_fan##num##_input) | |
210 | ||
1da177e4 LT |
211 | static int smsc47b397_detach_client(struct i2c_client *client) |
212 | { | |
943b0830 | 213 | struct smsc47b397_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
214 | int err; |
215 | ||
943b0830 MH |
216 | hwmon_device_unregister(data->class_dev); |
217 | ||
7bef5594 | 218 | if ((err = i2c_detach_client(client))) |
1da177e4 | 219 | return err; |
1da177e4 LT |
220 | |
221 | release_region(client->addr, SMSC_EXTENT); | |
943b0830 | 222 | kfree(data); |
1da177e4 LT |
223 | |
224 | return 0; | |
225 | } | |
226 | ||
2d8672c5 JD |
227 | static int smsc47b397_detect(struct i2c_adapter *adapter); |
228 | ||
1da177e4 | 229 | static struct i2c_driver smsc47b397_driver = { |
cdaf7934 | 230 | .driver = { |
87218842 | 231 | .owner = THIS_MODULE, |
cdaf7934 LR |
232 | .name = "smsc47b397", |
233 | }, | |
2d8672c5 | 234 | .attach_adapter = smsc47b397_detect, |
1da177e4 LT |
235 | .detach_client = smsc47b397_detach_client, |
236 | }; | |
237 | ||
2d8672c5 | 238 | static int smsc47b397_detect(struct i2c_adapter *adapter) |
1da177e4 LT |
239 | { |
240 | struct i2c_client *new_client; | |
241 | struct smsc47b397_data *data; | |
242 | int err = 0; | |
243 | ||
cdaf7934 LR |
244 | if (!request_region(address, SMSC_EXTENT, |
245 | smsc47b397_driver.driver.name)) { | |
2d8672c5 JD |
246 | dev_err(&adapter->dev, "Region 0x%x already in use!\n", |
247 | address); | |
1da177e4 LT |
248 | return -EBUSY; |
249 | } | |
250 | ||
ba9c2e8d | 251 | if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { |
1da177e4 LT |
252 | err = -ENOMEM; |
253 | goto error_release; | |
254 | } | |
1da177e4 LT |
255 | |
256 | new_client = &data->client; | |
257 | i2c_set_clientdata(new_client, data); | |
2d8672c5 | 258 | new_client->addr = address; |
9a61bf63 | 259 | mutex_init(&data->lock); |
1da177e4 LT |
260 | new_client->adapter = adapter; |
261 | new_client->driver = &smsc47b397_driver; | |
262 | new_client->flags = 0; | |
263 | ||
264 | strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); | |
265 | ||
9a61bf63 | 266 | mutex_init(&data->update_lock); |
1da177e4 LT |
267 | |
268 | if ((err = i2c_attach_client(new_client))) | |
269 | goto error_free; | |
270 | ||
943b0830 MH |
271 | data->class_dev = hwmon_device_register(&new_client->dev); |
272 | if (IS_ERR(data->class_dev)) { | |
273 | err = PTR_ERR(data->class_dev); | |
274 | goto error_detach; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | device_create_file_temp(new_client, 1); |
278 | device_create_file_temp(new_client, 2); | |
279 | device_create_file_temp(new_client, 3); | |
280 | device_create_file_temp(new_client, 4); | |
281 | ||
282 | device_create_file_fan(new_client, 1); | |
283 | device_create_file_fan(new_client, 2); | |
284 | device_create_file_fan(new_client, 3); | |
285 | device_create_file_fan(new_client, 4); | |
286 | ||
287 | return 0; | |
288 | ||
943b0830 MH |
289 | error_detach: |
290 | i2c_detach_client(new_client); | |
1da177e4 | 291 | error_free: |
1f57ff89 | 292 | kfree(data); |
1da177e4 | 293 | error_release: |
2d8672c5 | 294 | release_region(address, SMSC_EXTENT); |
1da177e4 LT |
295 | return err; |
296 | } | |
297 | ||
2d8672c5 | 298 | static int __init smsc47b397_find(unsigned short *addr) |
1da177e4 LT |
299 | { |
300 | u8 id, rev; | |
301 | ||
302 | superio_enter(); | |
303 | id = superio_inb(SUPERIO_REG_DEVID); | |
304 | ||
7ab83a91 | 305 | if ((id != 0x6f) && (id != 0x81)) { |
1da177e4 LT |
306 | superio_exit(); |
307 | return -ENODEV; | |
308 | } | |
309 | ||
310 | rev = superio_inb(SUPERIO_REG_DEVREV); | |
311 | ||
312 | superio_select(SUPERIO_REG_LD8); | |
313 | *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) | |
314 | | superio_inb(SUPERIO_REG_BASE_LSB); | |
315 | ||
7ab83a91 MH |
316 | printk(KERN_INFO "smsc47b397: found SMSC %s " |
317 | "(base address 0x%04x, revision %u)\n", | |
318 | id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev); | |
1da177e4 LT |
319 | |
320 | superio_exit(); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static int __init smsc47b397_init(void) | |
325 | { | |
326 | int ret; | |
327 | ||
2d8672c5 | 328 | if ((ret = smsc47b397_find(&address))) |
1da177e4 LT |
329 | return ret; |
330 | ||
fde09509 | 331 | return i2c_isa_add_driver(&smsc47b397_driver); |
1da177e4 LT |
332 | } |
333 | ||
334 | static void __exit smsc47b397_exit(void) | |
335 | { | |
fde09509 | 336 | i2c_isa_del_driver(&smsc47b397_driver); |
1da177e4 LT |
337 | } |
338 | ||
339 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); | |
340 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); | |
341 | MODULE_LICENSE("GPL"); | |
342 | ||
343 | module_init(smsc47b397_init); | |
344 | module_exit(smsc47b397_exit); |