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 LT |
37 | #include <linux/init.h> |
38 | #include <asm/io.h> | |
39 | ||
1da177e4 | 40 | /* Address is autodetected, there is no default value */ |
2d8672c5 | 41 | static unsigned short address; |
1da177e4 LT |
42 | |
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 | ||
48 | static inline void superio_outb(int reg, int val) | |
49 | { | |
50 | outb(reg, REG); | |
51 | outb(val, VAL); | |
52 | } | |
53 | ||
54 | static inline int superio_inb(int reg) | |
55 | { | |
56 | outb(reg, REG); | |
57 | return inb(VAL); | |
58 | } | |
59 | ||
60 | /* select superio logical device */ | |
61 | static inline void superio_select(int ld) | |
62 | { | |
63 | superio_outb(0x07, ld); | |
64 | } | |
65 | ||
66 | static inline void superio_enter(void) | |
67 | { | |
68 | outb(0x55, REG); | |
69 | } | |
70 | ||
71 | static 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 */ | |
85 | static 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 | ||
92 | struct smsc47b397_data { | |
93 | struct i2c_client client; | |
943b0830 | 94 | struct class_device *class_dev; |
1da177e4 LT |
95 | 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 | ||
106 | static 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 | ||
118 | static 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 */ | |
154 | static int temp_from_reg(u8 reg) | |
155 | { | |
156 | return (s8)reg * 1000; | |
157 | } | |
158 | ||
159 | /* 0 <= nr <= 3 */ | |
160 | static 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) \ | |
a5099cfc | 167 | static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
168 | { \ |
169 | return show_temp(dev, buf, num-1); \ | |
170 | } \ | |
171 | static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) | |
172 | ||
173 | sysfs_temp(1); | |
174 | sysfs_temp(2); | |
175 | sysfs_temp(3); | |
176 | sysfs_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 */ | |
183 | static int fan_from_reg(u16 reg) | |
184 | { | |
185 | return 90000 * 60 / reg; | |
186 | } | |
187 | ||
188 | /* 0 <= nr <= 3 */ | |
189 | static 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) \ | |
a5099cfc | 196 | static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
197 | { \ |
198 | return show_fan(dev, buf, num-1); \ | |
199 | } \ | |
200 | static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) | |
201 | ||
202 | sysfs_fan(1); | |
203 | sysfs_fan(2); | |
204 | sysfs_fan(3); | |
205 | sysfs_fan(4); | |
206 | ||
207 | #define device_create_file_fan(client, num) \ | |
208 | device_create_file(&client->dev, &dev_attr_fan##num##_input) | |
209 | ||
1da177e4 LT |
210 | static int smsc47b397_detach_client(struct i2c_client *client) |
211 | { | |
943b0830 | 212 | struct smsc47b397_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
213 | int err; |
214 | ||
943b0830 MH |
215 | hwmon_device_unregister(data->class_dev); |
216 | ||
7bef5594 | 217 | if ((err = i2c_detach_client(client))) |
1da177e4 | 218 | return err; |
1da177e4 LT |
219 | |
220 | release_region(client->addr, SMSC_EXTENT); | |
943b0830 | 221 | kfree(data); |
1da177e4 LT |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
2d8672c5 JD |
226 | static int smsc47b397_detect(struct i2c_adapter *adapter); |
227 | ||
1da177e4 LT |
228 | static struct i2c_driver smsc47b397_driver = { |
229 | .owner = THIS_MODULE, | |
230 | .name = "smsc47b397", | |
2d8672c5 | 231 | .attach_adapter = smsc47b397_detect, |
1da177e4 LT |
232 | .detach_client = smsc47b397_detach_client, |
233 | }; | |
234 | ||
2d8672c5 | 235 | static int smsc47b397_detect(struct i2c_adapter *adapter) |
1da177e4 LT |
236 | { |
237 | struct i2c_client *new_client; | |
238 | struct smsc47b397_data *data; | |
239 | int err = 0; | |
240 | ||
2d8672c5 JD |
241 | if (!request_region(address, SMSC_EXTENT, smsc47b397_driver.name)) { |
242 | dev_err(&adapter->dev, "Region 0x%x already in use!\n", | |
243 | address); | |
1da177e4 LT |
244 | return -EBUSY; |
245 | } | |
246 | ||
247 | if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { | |
248 | err = -ENOMEM; | |
249 | goto error_release; | |
250 | } | |
251 | memset(data, 0x00, sizeof(struct smsc47b397_data)); | |
252 | ||
253 | new_client = &data->client; | |
254 | i2c_set_clientdata(new_client, data); | |
2d8672c5 | 255 | new_client->addr = address; |
1da177e4 LT |
256 | init_MUTEX(&data->lock); |
257 | new_client->adapter = adapter; | |
258 | new_client->driver = &smsc47b397_driver; | |
259 | new_client->flags = 0; | |
260 | ||
261 | strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); | |
262 | ||
263 | init_MUTEX(&data->update_lock); | |
264 | ||
265 | if ((err = i2c_attach_client(new_client))) | |
266 | goto error_free; | |
267 | ||
943b0830 MH |
268 | data->class_dev = hwmon_device_register(&new_client->dev); |
269 | if (IS_ERR(data->class_dev)) { | |
270 | err = PTR_ERR(data->class_dev); | |
271 | goto error_detach; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | device_create_file_temp(new_client, 1); |
275 | device_create_file_temp(new_client, 2); | |
276 | device_create_file_temp(new_client, 3); | |
277 | device_create_file_temp(new_client, 4); | |
278 | ||
279 | device_create_file_fan(new_client, 1); | |
280 | device_create_file_fan(new_client, 2); | |
281 | device_create_file_fan(new_client, 3); | |
282 | device_create_file_fan(new_client, 4); | |
283 | ||
284 | return 0; | |
285 | ||
943b0830 MH |
286 | error_detach: |
287 | i2c_detach_client(new_client); | |
1da177e4 | 288 | error_free: |
1f57ff89 | 289 | kfree(data); |
1da177e4 | 290 | error_release: |
2d8672c5 | 291 | release_region(address, SMSC_EXTENT); |
1da177e4 LT |
292 | return err; |
293 | } | |
294 | ||
2d8672c5 | 295 | static int __init smsc47b397_find(unsigned short *addr) |
1da177e4 LT |
296 | { |
297 | u8 id, rev; | |
298 | ||
299 | superio_enter(); | |
300 | id = superio_inb(SUPERIO_REG_DEVID); | |
301 | ||
302 | if (id != 0x6f) { | |
303 | superio_exit(); | |
304 | return -ENODEV; | |
305 | } | |
306 | ||
307 | rev = superio_inb(SUPERIO_REG_DEVREV); | |
308 | ||
309 | superio_select(SUPERIO_REG_LD8); | |
310 | *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) | |
311 | | superio_inb(SUPERIO_REG_BASE_LSB); | |
312 | ||
313 | printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC " | |
314 | "(base address 0x%04x, revision %u)\n", *addr, rev); | |
315 | ||
316 | superio_exit(); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static int __init smsc47b397_init(void) | |
321 | { | |
322 | int ret; | |
323 | ||
2d8672c5 | 324 | if ((ret = smsc47b397_find(&address))) |
1da177e4 LT |
325 | return ret; |
326 | ||
fde09509 | 327 | return i2c_isa_add_driver(&smsc47b397_driver); |
1da177e4 LT |
328 | } |
329 | ||
330 | static void __exit smsc47b397_exit(void) | |
331 | { | |
fde09509 | 332 | i2c_isa_del_driver(&smsc47b397_driver); |
1da177e4 LT |
333 | } |
334 | ||
335 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); | |
336 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); | |
337 | MODULE_LICENSE("GPL"); | |
338 | ||
339 | module_init(smsc47b397_init); | |
340 | module_exit(smsc47b397_exit); |