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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> | |
34 | #include <linux/i2c-sensor.h> | |
35 | #include <linux/init.h> | |
36 | #include <asm/io.h> | |
37 | ||
38 | static unsigned short normal_i2c[] = { I2C_CLIENT_END }; | |
39 | /* Address is autodetected, there is no default value */ | |
40 | static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END }; | |
41 | static struct i2c_force_data forces[] = {{NULL}}; | |
42 | ||
43 | enum chips { any_chip, smsc47b397 }; | |
44 | static struct i2c_address_data addr_data = { | |
45 | .normal_i2c = normal_i2c, | |
46 | .normal_isa = normal_isa, | |
47 | .probe = normal_i2c, /* cheat */ | |
48 | .ignore = normal_i2c, /* cheat */ | |
49 | .forces = forces, | |
50 | }; | |
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 | struct i2c_client client; | |
103 | struct semaphore lock; | |
104 | ||
105 | struct semaphore 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 i2c_client *client, u8 reg) | |
115 | { | |
116 | struct smsc47b397_data *data = i2c_get_clientdata(client); | |
117 | int res; | |
118 | ||
119 | down(&data->lock); | |
120 | outb(reg, client->addr); | |
121 | res = inb_p(client->addr + 1); | |
122 | up(&data->lock); | |
123 | return res; | |
124 | } | |
125 | ||
126 | static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) | |
127 | { | |
128 | struct i2c_client *client = to_i2c_client(dev); | |
129 | struct smsc47b397_data *data = i2c_get_clientdata(client); | |
130 | int i; | |
131 | ||
132 | down(&data->update_lock); | |
133 | ||
134 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
135 | dev_dbg(&client->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(client, | |
140 | SMSC47B397_REG_TEMP(i)); | |
141 | ||
142 | /* must read LSB first */ | |
143 | data->fan[i] = smsc47b397_read_value(client, | |
144 | SMSC47B397_REG_FAN_LSB(i)); | |
145 | data->fan[i] |= smsc47b397_read_value(client, | |
146 | SMSC47B397_REG_FAN_MSB(i)) << 8; | |
147 | } | |
148 | ||
149 | data->last_updated = jiffies; | |
150 | data->valid = 1; | |
151 | ||
152 | dev_dbg(&client->dev, "... device update complete\n"); | |
153 | } | |
154 | ||
155 | up(&data->update_lock); | |
156 | ||
157 | return data; | |
158 | } | |
159 | ||
160 | /* TEMP: 0.001C/bit (-128C to +127C) | |
161 | REG: 1C/bit, two's complement */ | |
162 | static int temp_from_reg(u8 reg) | |
163 | { | |
164 | return (s8)reg * 1000; | |
165 | } | |
166 | ||
167 | /* 0 <= nr <= 3 */ | |
168 | static ssize_t show_temp(struct device *dev, char *buf, int nr) | |
169 | { | |
170 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
171 | return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr])); | |
172 | } | |
173 | ||
174 | #define sysfs_temp(num) \ | |
a5099cfc | 175 | static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
176 | { \ |
177 | return show_temp(dev, buf, num-1); \ | |
178 | } \ | |
179 | static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) | |
180 | ||
181 | sysfs_temp(1); | |
182 | sysfs_temp(2); | |
183 | sysfs_temp(3); | |
184 | sysfs_temp(4); | |
185 | ||
186 | #define device_create_file_temp(client, num) \ | |
187 | device_create_file(&client->dev, &dev_attr_temp##num##_input) | |
188 | ||
189 | /* FAN: 1 RPM/bit | |
190 | REG: count of 90kHz pulses / revolution */ | |
191 | static int fan_from_reg(u16 reg) | |
192 | { | |
193 | return 90000 * 60 / reg; | |
194 | } | |
195 | ||
196 | /* 0 <= nr <= 3 */ | |
197 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
198 | { | |
199 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
200 | return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr])); | |
201 | } | |
202 | ||
203 | #define sysfs_fan(num) \ | |
a5099cfc | 204 | static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
205 | { \ |
206 | return show_fan(dev, buf, num-1); \ | |
207 | } \ | |
208 | static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) | |
209 | ||
210 | sysfs_fan(1); | |
211 | sysfs_fan(2); | |
212 | sysfs_fan(3); | |
213 | sysfs_fan(4); | |
214 | ||
215 | #define device_create_file_fan(client, num) \ | |
216 | device_create_file(&client->dev, &dev_attr_fan##num##_input) | |
217 | ||
218 | static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind); | |
219 | ||
220 | static int smsc47b397_attach_adapter(struct i2c_adapter *adapter) | |
221 | { | |
222 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
223 | return 0; | |
224 | return i2c_detect(adapter, &addr_data, smsc47b397_detect); | |
225 | } | |
226 | ||
227 | static int smsc47b397_detach_client(struct i2c_client *client) | |
228 | { | |
229 | int err; | |
230 | ||
231 | if ((err = i2c_detach_client(client))) { | |
232 | dev_err(&client->dev, "Client deregistration failed, " | |
233 | "client not detached.\n"); | |
234 | return err; | |
235 | } | |
236 | ||
237 | release_region(client->addr, SMSC_EXTENT); | |
238 | kfree(i2c_get_clientdata(client)); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static struct i2c_driver smsc47b397_driver = { | |
244 | .owner = THIS_MODULE, | |
245 | .name = "smsc47b397", | |
246 | .id = I2C_DRIVERID_SMSC47B397, | |
247 | .flags = I2C_DF_NOTIFY, | |
248 | .attach_adapter = smsc47b397_attach_adapter, | |
249 | .detach_client = smsc47b397_detach_client, | |
250 | }; | |
251 | ||
252 | static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind) | |
253 | { | |
254 | struct i2c_client *new_client; | |
255 | struct smsc47b397_data *data; | |
256 | int err = 0; | |
257 | ||
258 | if (!i2c_is_isa_adapter(adapter)) { | |
259 | return 0; | |
260 | } | |
261 | ||
262 | if (!request_region(addr, SMSC_EXTENT, smsc47b397_driver.name)) { | |
263 | dev_err(&adapter->dev, "Region 0x%x already in use!\n", addr); | |
264 | return -EBUSY; | |
265 | } | |
266 | ||
267 | if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { | |
268 | err = -ENOMEM; | |
269 | goto error_release; | |
270 | } | |
271 | memset(data, 0x00, sizeof(struct smsc47b397_data)); | |
272 | ||
273 | new_client = &data->client; | |
274 | i2c_set_clientdata(new_client, data); | |
275 | new_client->addr = addr; | |
276 | init_MUTEX(&data->lock); | |
277 | new_client->adapter = adapter; | |
278 | new_client->driver = &smsc47b397_driver; | |
279 | new_client->flags = 0; | |
280 | ||
281 | strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); | |
282 | ||
283 | init_MUTEX(&data->update_lock); | |
284 | ||
285 | if ((err = i2c_attach_client(new_client))) | |
286 | goto error_free; | |
287 | ||
288 | device_create_file_temp(new_client, 1); | |
289 | device_create_file_temp(new_client, 2); | |
290 | device_create_file_temp(new_client, 3); | |
291 | device_create_file_temp(new_client, 4); | |
292 | ||
293 | device_create_file_fan(new_client, 1); | |
294 | device_create_file_fan(new_client, 2); | |
295 | device_create_file_fan(new_client, 3); | |
296 | device_create_file_fan(new_client, 4); | |
297 | ||
298 | return 0; | |
299 | ||
300 | error_free: | |
301 | kfree(new_client); | |
302 | error_release: | |
303 | release_region(addr, SMSC_EXTENT); | |
304 | return err; | |
305 | } | |
306 | ||
307 | static int __init smsc47b397_find(unsigned int *addr) | |
308 | { | |
309 | u8 id, rev; | |
310 | ||
311 | superio_enter(); | |
312 | id = superio_inb(SUPERIO_REG_DEVID); | |
313 | ||
314 | if (id != 0x6f) { | |
315 | superio_exit(); | |
316 | return -ENODEV; | |
317 | } | |
318 | ||
319 | rev = superio_inb(SUPERIO_REG_DEVREV); | |
320 | ||
321 | superio_select(SUPERIO_REG_LD8); | |
322 | *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) | |
323 | | superio_inb(SUPERIO_REG_BASE_LSB); | |
324 | ||
325 | printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC " | |
326 | "(base address 0x%04x, revision %u)\n", *addr, rev); | |
327 | ||
328 | superio_exit(); | |
329 | return 0; | |
330 | } | |
331 | ||
332 | static int __init smsc47b397_init(void) | |
333 | { | |
334 | int ret; | |
335 | ||
336 | if ((ret = smsc47b397_find(normal_isa))) | |
337 | return ret; | |
338 | ||
339 | return i2c_add_driver(&smsc47b397_driver); | |
340 | } | |
341 | ||
342 | static void __exit smsc47b397_exit(void) | |
343 | { | |
344 | i2c_del_driver(&smsc47b397_driver); | |
345 | } | |
346 | ||
347 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); | |
348 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); | |
349 | MODULE_LICENSE("GPL"); | |
350 | ||
351 | module_init(smsc47b397_init); | |
352 | module_exit(smsc47b397_exit); |