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/i2c.h>
33 #include <linux/i2c-sensor.h>
34 #include <linux/init.h>
35 #include <asm/io.h>
36
37 static unsigned short normal_i2c[] = { I2C_CLIENT_END };
38 /* Address is autodetected, there is no default value */
39 static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
40 static struct i2c_force_data forces[] = {{NULL}};
41
42 enum chips { any_chip, smsc47b397 };
43 static struct i2c_address_data addr_data = {
44 .normal_i2c = normal_i2c,
45 .normal_isa = normal_isa,
46 .probe = normal_i2c, /* cheat */
47 .ignore = normal_i2c, /* cheat */
48 .forces = forces,
49 };
50
51 /* Super-I/0 registers and commands */
52
53 #define REG 0x2e /* The register to read/write */
54 #define VAL 0x2f /* The value to read/write */
55
56 static inline void superio_outb(int reg, int val)
57 {
58 outb(reg, REG);
59 outb(val, VAL);
60 }
61
62 static inline int superio_inb(int reg)
63 {
64 outb(reg, REG);
65 return inb(VAL);
66 }
67
68 /* select superio logical device */
69 static inline void superio_select(int ld)
70 {
71 superio_outb(0x07, ld);
72 }
73
74 static inline void superio_enter(void)
75 {
76 outb(0x55, REG);
77 }
78
79 static inline void superio_exit(void)
80 {
81 outb(0xAA, REG);
82 }
83
84 #define SUPERIO_REG_DEVID 0x20
85 #define SUPERIO_REG_DEVREV 0x21
86 #define SUPERIO_REG_BASE_MSB 0x60
87 #define SUPERIO_REG_BASE_LSB 0x61
88 #define SUPERIO_REG_LD8 0x08
89
90 #define SMSC_EXTENT 0x02
91
92 /* 0 <= nr <= 3 */
93 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
94 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
95
96 /* 0 <= nr <= 3 */
97 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
98 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
99
100 struct smsc47b397_data {
101 struct i2c_client client;
102 struct semaphore lock;
103
104 struct semaphore update_lock;
105 unsigned long last_updated; /* in jiffies */
106 int valid;
107
108 /* register values */
109 u16 fan[4];
110 u8 temp[4];
111 };
112
113 static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
114 {
115 struct smsc47b397_data *data = i2c_get_clientdata(client);
116 int res;
117
118 down(&data->lock);
119 outb(reg, client->addr);
120 res = inb_p(client->addr + 1);
121 up(&data->lock);
122 return res;
123 }
124
125 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
126 {
127 struct i2c_client *client = to_i2c_client(dev);
128 struct smsc47b397_data *data = i2c_get_clientdata(client);
129 int i;
130
131 down(&data->update_lock);
132
133 if (time_after(jiffies - data->last_updated, (unsigned long)HZ)
134 || time_before(jiffies, data->last_updated) || !data->valid) {
135
136 dev_dbg(&client->dev, "starting device update...\n");
137
138 /* 4 temperature inputs, 4 fan inputs */
139 for (i = 0; i < 4; i++) {
140 data->temp[i] = smsc47b397_read_value(client,
141 SMSC47B397_REG_TEMP(i));
142
143 /* must read LSB first */
144 data->fan[i] = smsc47b397_read_value(client,
145 SMSC47B397_REG_FAN_LSB(i));
146 data->fan[i] |= smsc47b397_read_value(client,
147 SMSC47B397_REG_FAN_MSB(i)) << 8;
148 }
149
150 data->last_updated = jiffies;
151 data->valid = 1;
152
153 dev_dbg(&client->dev, "... device update complete\n");
154 }
155
156 up(&data->update_lock);
157
158 return data;
159 }
160
161 /* TEMP: 0.001C/bit (-128C to +127C)
162 REG: 1C/bit, two's complement */
163 static int temp_from_reg(u8 reg)
164 {
165 return (s8)reg * 1000;
166 }
167
168 /* 0 <= nr <= 3 */
169 static ssize_t show_temp(struct device *dev, char *buf, int nr)
170 {
171 struct smsc47b397_data *data = smsc47b397_update_device(dev);
172 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
173 }
174
175 #define sysfs_temp(num) \
176 static ssize_t show_temp##num(struct device *dev, char *buf) \
177 { \
178 return show_temp(dev, buf, num-1); \
179 } \
180 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
181
182 sysfs_temp(1);
183 sysfs_temp(2);
184 sysfs_temp(3);
185 sysfs_temp(4);
186
187 #define device_create_file_temp(client, num) \
188 device_create_file(&client->dev, &dev_attr_temp##num##_input)
189
190 /* FAN: 1 RPM/bit
191 REG: count of 90kHz pulses / revolution */
192 static int fan_from_reg(u16 reg)
193 {
194 return 90000 * 60 / reg;
195 }
196
197 /* 0 <= nr <= 3 */
198 static ssize_t show_fan(struct device *dev, char *buf, int nr)
199 {
200 struct smsc47b397_data *data = smsc47b397_update_device(dev);
201 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
202 }
203
204 #define sysfs_fan(num) \
205 static ssize_t show_fan##num(struct device *dev, char *buf) \
206 { \
207 return show_fan(dev, buf, num-1); \
208 } \
209 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
210
211 sysfs_fan(1);
212 sysfs_fan(2);
213 sysfs_fan(3);
214 sysfs_fan(4);
215
216 #define device_create_file_fan(client, num) \
217 device_create_file(&client->dev, &dev_attr_fan##num##_input)
218
219 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind);
220
221 static int smsc47b397_attach_adapter(struct i2c_adapter *adapter)
222 {
223 if (!(adapter->class & I2C_CLASS_HWMON))
224 return 0;
225 return i2c_detect(adapter, &addr_data, smsc47b397_detect);
226 }
227
228 static int smsc47b397_detach_client(struct i2c_client *client)
229 {
230 int err;
231
232 if ((err = i2c_detach_client(client))) {
233 dev_err(&client->dev, "Client deregistration failed, "
234 "client not detached.\n");
235 return err;
236 }
237
238 release_region(client->addr, SMSC_EXTENT);
239 kfree(i2c_get_clientdata(client));
240
241 return 0;
242 }
243
244 static struct i2c_driver smsc47b397_driver = {
245 .owner = THIS_MODULE,
246 .name = "smsc47b397",
247 .id = I2C_DRIVERID_SMSC47B397,
248 .flags = I2C_DF_NOTIFY,
249 .attach_adapter = smsc47b397_attach_adapter,
250 .detach_client = smsc47b397_detach_client,
251 };
252
253 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind)
254 {
255 struct i2c_client *new_client;
256 struct smsc47b397_data *data;
257 int err = 0;
258
259 if (!i2c_is_isa_adapter(adapter)) {
260 return 0;
261 }
262
263 if (!request_region(addr, SMSC_EXTENT, smsc47b397_driver.name)) {
264 dev_err(&adapter->dev, "Region 0x%x already in use!\n", addr);
265 return -EBUSY;
266 }
267
268 if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
269 err = -ENOMEM;
270 goto error_release;
271 }
272 memset(data, 0x00, sizeof(struct smsc47b397_data));
273
274 new_client = &data->client;
275 i2c_set_clientdata(new_client, data);
276 new_client->addr = addr;
277 init_MUTEX(&data->lock);
278 new_client->adapter = adapter;
279 new_client->driver = &smsc47b397_driver;
280 new_client->flags = 0;
281
282 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
283
284 init_MUTEX(&data->update_lock);
285
286 if ((err = i2c_attach_client(new_client)))
287 goto error_free;
288
289 device_create_file_temp(new_client, 1);
290 device_create_file_temp(new_client, 2);
291 device_create_file_temp(new_client, 3);
292 device_create_file_temp(new_client, 4);
293
294 device_create_file_fan(new_client, 1);
295 device_create_file_fan(new_client, 2);
296 device_create_file_fan(new_client, 3);
297 device_create_file_fan(new_client, 4);
298
299 return 0;
300
301 error_free:
302 kfree(new_client);
303 error_release:
304 release_region(addr, SMSC_EXTENT);
305 return err;
306 }
307
308 static int __init smsc47b397_find(unsigned int *addr)
309 {
310 u8 id, rev;
311
312 superio_enter();
313 id = superio_inb(SUPERIO_REG_DEVID);
314
315 if (id != 0x6f) {
316 superio_exit();
317 return -ENODEV;
318 }
319
320 rev = superio_inb(SUPERIO_REG_DEVREV);
321
322 superio_select(SUPERIO_REG_LD8);
323 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
324 | superio_inb(SUPERIO_REG_BASE_LSB);
325
326 printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC "
327 "(base address 0x%04x, revision %u)\n", *addr, rev);
328
329 superio_exit();
330 return 0;
331 }
332
333 static int __init smsc47b397_init(void)
334 {
335 int ret;
336
337 if ((ret = smsc47b397_find(normal_isa)))
338 return ret;
339
340 return i2c_add_driver(&smsc47b397_driver);
341 }
342
343 static void __exit smsc47b397_exit(void)
344 {
345 i2c_del_driver(&smsc47b397_driver);
346 }
347
348 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
349 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
350 MODULE_LICENSE("GPL");
351
352 module_init(smsc47b397_init);
353 module_exit(smsc47b397_exit);
354
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