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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 <jdelvare@suse.de> | |
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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
30 | ||
31 | #include <linux/module.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/ioport.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/hwmon.h> | |
37 | #include <linux/hwmon-sysfs.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/mutex.h> | |
41 | #include <linux/acpi.h> | |
42 | #include <linux/io.h> | |
43 | ||
44 | static unsigned short force_id; | |
45 | module_param(force_id, ushort, 0); | |
46 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); | |
47 | ||
48 | static struct platform_device *pdev; | |
49 | ||
50 | #define DRVNAME "smsc47b397" | |
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 | unsigned short addr; | |
103 | struct mutex lock; | |
104 | ||
105 | struct mutex 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 smsc47b397_data *data, u8 reg) | |
115 | { | |
116 | int res; | |
117 | ||
118 | mutex_lock(&data->lock); | |
119 | outb(reg, data->addr); | |
120 | res = inb_p(data->addr + 1); | |
121 | mutex_unlock(&data->lock); | |
122 | return res; | |
123 | } | |
124 | ||
125 | static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) | |
126 | { | |
127 | struct smsc47b397_data *data = dev_get_drvdata(dev); | |
128 | int i; | |
129 | ||
130 | mutex_lock(&data->update_lock); | |
131 | ||
132 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
133 | dev_dbg(dev, "starting device update...\n"); | |
134 | ||
135 | /* 4 temperature inputs, 4 fan inputs */ | |
136 | for (i = 0; i < 4; i++) { | |
137 | data->temp[i] = smsc47b397_read_value(data, | |
138 | SMSC47B397_REG_TEMP(i)); | |
139 | ||
140 | /* must read LSB first */ | |
141 | data->fan[i] = smsc47b397_read_value(data, | |
142 | SMSC47B397_REG_FAN_LSB(i)); | |
143 | data->fan[i] |= smsc47b397_read_value(data, | |
144 | SMSC47B397_REG_FAN_MSB(i)) << 8; | |
145 | } | |
146 | ||
147 | data->last_updated = jiffies; | |
148 | data->valid = 1; | |
149 | ||
150 | dev_dbg(dev, "... device update complete\n"); | |
151 | } | |
152 | ||
153 | mutex_unlock(&data->update_lock); | |
154 | ||
155 | return data; | |
156 | } | |
157 | ||
158 | /* | |
159 | * TEMP: 0.001C/bit (-128C to +127C) | |
160 | * REG: 1C/bit, two's complement | |
161 | */ | |
162 | static int temp_from_reg(u8 reg) | |
163 | { | |
164 | return (s8)reg * 1000; | |
165 | } | |
166 | ||
167 | static ssize_t show_temp(struct device *dev, struct device_attribute | |
168 | *devattr, char *buf) | |
169 | { | |
170 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
171 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
172 | return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); | |
173 | } | |
174 | ||
175 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
176 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); | |
177 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); | |
178 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); | |
179 | ||
180 | /* | |
181 | * FAN: 1 RPM/bit | |
182 | * REG: count of 90kHz pulses / revolution | |
183 | */ | |
184 | static int fan_from_reg(u16 reg) | |
185 | { | |
186 | if (reg == 0 || reg == 0xffff) | |
187 | return 0; | |
188 | return 90000 * 60 / reg; | |
189 | } | |
190 | ||
191 | static ssize_t show_fan(struct device *dev, struct device_attribute | |
192 | *devattr, char *buf) | |
193 | { | |
194 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
195 | struct smsc47b397_data *data = smsc47b397_update_device(dev); | |
196 | return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); | |
197 | } | |
198 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); | |
199 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); | |
200 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); | |
201 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); | |
202 | ||
203 | static struct attribute *smsc47b397_attrs[] = { | |
204 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
205 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
206 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
207 | &sensor_dev_attr_temp4_input.dev_attr.attr, | |
208 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
209 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
210 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
211 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
212 | ||
213 | NULL | |
214 | }; | |
215 | ||
216 | ATTRIBUTE_GROUPS(smsc47b397); | |
217 | ||
218 | static int smsc47b397_probe(struct platform_device *pdev); | |
219 | ||
220 | static struct platform_driver smsc47b397_driver = { | |
221 | .driver = { | |
222 | .name = DRVNAME, | |
223 | }, | |
224 | .probe = smsc47b397_probe, | |
225 | }; | |
226 | ||
227 | static int smsc47b397_probe(struct platform_device *pdev) | |
228 | { | |
229 | struct device *dev = &pdev->dev; | |
230 | struct smsc47b397_data *data; | |
231 | struct device *hwmon_dev; | |
232 | struct resource *res; | |
233 | ||
234 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
235 | if (!devm_request_region(dev, res->start, SMSC_EXTENT, | |
236 | smsc47b397_driver.driver.name)) { | |
237 | dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", | |
238 | (unsigned long)res->start, | |
239 | (unsigned long)res->start + SMSC_EXTENT - 1); | |
240 | return -EBUSY; | |
241 | } | |
242 | ||
243 | data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL); | |
244 | if (!data) | |
245 | return -ENOMEM; | |
246 | ||
247 | data->addr = res->start; | |
248 | mutex_init(&data->lock); | |
249 | mutex_init(&data->update_lock); | |
250 | ||
251 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397", | |
252 | data, | |
253 | smsc47b397_groups); | |
254 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
255 | } | |
256 | ||
257 | static int __init smsc47b397_device_add(unsigned short address) | |
258 | { | |
259 | struct resource res = { | |
260 | .start = address, | |
261 | .end = address + SMSC_EXTENT - 1, | |
262 | .name = DRVNAME, | |
263 | .flags = IORESOURCE_IO, | |
264 | }; | |
265 | int err; | |
266 | ||
267 | err = acpi_check_resource_conflict(&res); | |
268 | if (err) | |
269 | goto exit; | |
270 | ||
271 | pdev = platform_device_alloc(DRVNAME, address); | |
272 | if (!pdev) { | |
273 | err = -ENOMEM; | |
274 | pr_err("Device allocation failed\n"); | |
275 | goto exit; | |
276 | } | |
277 | ||
278 | err = platform_device_add_resources(pdev, &res, 1); | |
279 | if (err) { | |
280 | pr_err("Device resource addition failed (%d)\n", err); | |
281 | goto exit_device_put; | |
282 | } | |
283 | ||
284 | err = platform_device_add(pdev); | |
285 | if (err) { | |
286 | pr_err("Device addition failed (%d)\n", err); | |
287 | goto exit_device_put; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | ||
292 | exit_device_put: | |
293 | platform_device_put(pdev); | |
294 | exit: | |
295 | return err; | |
296 | } | |
297 | ||
298 | static int __init smsc47b397_find(void) | |
299 | { | |
300 | u8 id, rev; | |
301 | char *name; | |
302 | unsigned short addr; | |
303 | ||
304 | superio_enter(); | |
305 | id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); | |
306 | ||
307 | switch (id) { | |
308 | case 0x81: | |
309 | name = "SCH5307-NS"; | |
310 | break; | |
311 | case 0x6f: | |
312 | name = "LPC47B397-NC"; | |
313 | break; | |
314 | case 0x85: | |
315 | case 0x8c: | |
316 | name = "SCH5317"; | |
317 | break; | |
318 | default: | |
319 | superio_exit(); | |
320 | return -ENODEV; | |
321 | } | |
322 | ||
323 | rev = superio_inb(SUPERIO_REG_DEVREV); | |
324 | ||
325 | superio_select(SUPERIO_REG_LD8); | |
326 | addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) | |
327 | | superio_inb(SUPERIO_REG_BASE_LSB); | |
328 | ||
329 | pr_info("found SMSC %s (base address 0x%04x, revision %u)\n", | |
330 | name, addr, rev); | |
331 | ||
332 | superio_exit(); | |
333 | return addr; | |
334 | } | |
335 | ||
336 | static int __init smsc47b397_init(void) | |
337 | { | |
338 | unsigned short address; | |
339 | int ret; | |
340 | ||
341 | ret = smsc47b397_find(); | |
342 | if (ret < 0) | |
343 | return ret; | |
344 | address = ret; | |
345 | ||
346 | ret = platform_driver_register(&smsc47b397_driver); | |
347 | if (ret) | |
348 | goto exit; | |
349 | ||
350 | /* Sets global pdev as a side effect */ | |
351 | ret = smsc47b397_device_add(address); | |
352 | if (ret) | |
353 | goto exit_driver; | |
354 | ||
355 | return 0; | |
356 | ||
357 | exit_driver: | |
358 | platform_driver_unregister(&smsc47b397_driver); | |
359 | exit: | |
360 | return ret; | |
361 | } | |
362 | ||
363 | static void __exit smsc47b397_exit(void) | |
364 | { | |
365 | platform_device_unregister(pdev); | |
366 | platform_driver_unregister(&smsc47b397_driver); | |
367 | } | |
368 | ||
369 | MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); | |
370 | MODULE_DESCRIPTION("SMSC LPC47B397 driver"); | |
371 | MODULE_LICENSE("GPL"); | |
372 | ||
373 | module_init(smsc47b397_init); | |
374 | module_exit(smsc47b397_exit); |