xref: /openbmc/linux/drivers/hwmon/smsc47b397.c (revision b34e08d5) 
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 	const char *name;
104 	struct device *hwmon_dev;
105 	struct mutex lock;
106 
107 	struct mutex update_lock;
108 	unsigned long last_updated; /* in jiffies */
109 	int valid;
110 
111 	/* register values */
112 	u16 fan[4];
113 	u8 temp[4];
114 };
115 
116 static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
117 {
118 	int res;
119 
120 	mutex_lock(&data->lock);
121 	outb(reg, data->addr);
122 	res = inb_p(data->addr + 1);
123 	mutex_unlock(&data->lock);
124 	return res;
125 }
126 
127 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
128 {
129 	struct smsc47b397_data *data = dev_get_drvdata(dev);
130 	int i;
131 
132 	mutex_lock(&data->update_lock);
133 
134 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
135 		dev_dbg(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(data,
140 					SMSC47B397_REG_TEMP(i));
141 
142 			/* must read LSB first */
143 			data->fan[i]  = smsc47b397_read_value(data,
144 					SMSC47B397_REG_FAN_LSB(i));
145 			data->fan[i] |= smsc47b397_read_value(data,
146 					SMSC47B397_REG_FAN_MSB(i)) << 8;
147 		}
148 
149 		data->last_updated = jiffies;
150 		data->valid = 1;
151 
152 		dev_dbg(dev, "... device update complete\n");
153 	}
154 
155 	mutex_unlock(&data->update_lock);
156 
157 	return data;
158 }
159 
160 /*
161  * TEMP: 0.001C/bit (-128C to +127C)
162  * REG: 1C/bit, two's complement
163  */
164 static int temp_from_reg(u8 reg)
165 {
166 	return (s8)reg * 1000;
167 }
168 
169 static ssize_t show_temp(struct device *dev, struct device_attribute
170 			 *devattr, char *buf)
171 {
172 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
173 	struct smsc47b397_data *data = smsc47b397_update_device(dev);
174 	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
175 }
176 
177 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
178 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
179 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
180 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
181 
182 /*
183  * FAN: 1 RPM/bit
184  * REG: count of 90kHz pulses / revolution
185  */
186 static int fan_from_reg(u16 reg)
187 {
188 	if (reg == 0 || reg == 0xffff)
189 		return 0;
190 	return 90000 * 60 / reg;
191 }
192 
193 static ssize_t show_fan(struct device *dev, struct device_attribute
194 			*devattr, char *buf)
195 {
196 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
197 	struct smsc47b397_data *data = smsc47b397_update_device(dev);
198 	return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
199 }
200 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
201 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
202 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
203 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
204 
205 static ssize_t show_name(struct device *dev, struct device_attribute
206 			 *devattr, char *buf)
207 {
208 	struct smsc47b397_data *data = dev_get_drvdata(dev);
209 	return sprintf(buf, "%s\n", data->name);
210 }
211 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
212 
213 static struct attribute *smsc47b397_attributes[] = {
214 	&sensor_dev_attr_temp1_input.dev_attr.attr,
215 	&sensor_dev_attr_temp2_input.dev_attr.attr,
216 	&sensor_dev_attr_temp3_input.dev_attr.attr,
217 	&sensor_dev_attr_temp4_input.dev_attr.attr,
218 	&sensor_dev_attr_fan1_input.dev_attr.attr,
219 	&sensor_dev_attr_fan2_input.dev_attr.attr,
220 	&sensor_dev_attr_fan3_input.dev_attr.attr,
221 	&sensor_dev_attr_fan4_input.dev_attr.attr,
222 
223 	&dev_attr_name.attr,
224 	NULL
225 };
226 
227 static const struct attribute_group smsc47b397_group = {
228 	.attrs = smsc47b397_attributes,
229 };
230 
231 static int smsc47b397_remove(struct platform_device *pdev)
232 {
233 	struct smsc47b397_data *data = platform_get_drvdata(pdev);
234 
235 	hwmon_device_unregister(data->hwmon_dev);
236 	sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
237 
238 	return 0;
239 }
240 
241 static int smsc47b397_probe(struct platform_device *pdev);
242 
243 static struct platform_driver smsc47b397_driver = {
244 	.driver = {
245 		.owner	= THIS_MODULE,
246 		.name	= DRVNAME,
247 	},
248 	.probe		= smsc47b397_probe,
249 	.remove		= smsc47b397_remove,
250 };
251 
252 static int smsc47b397_probe(struct platform_device *pdev)
253 {
254 	struct device *dev = &pdev->dev;
255 	struct smsc47b397_data *data;
256 	struct resource *res;
257 	int err = 0;
258 
259 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
260 	if (!devm_request_region(dev, res->start, SMSC_EXTENT,
261 				 smsc47b397_driver.driver.name)) {
262 		dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
263 			(unsigned long)res->start,
264 			(unsigned long)res->start + SMSC_EXTENT - 1);
265 		return -EBUSY;
266 	}
267 
268 	data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
269 	if (!data)
270 		return -ENOMEM;
271 
272 	data->addr = res->start;
273 	data->name = "smsc47b397";
274 	mutex_init(&data->lock);
275 	mutex_init(&data->update_lock);
276 	platform_set_drvdata(pdev, data);
277 
278 	err = sysfs_create_group(&dev->kobj, &smsc47b397_group);
279 	if (err)
280 		return err;
281 
282 	data->hwmon_dev = hwmon_device_register(dev);
283 	if (IS_ERR(data->hwmon_dev)) {
284 		err = PTR_ERR(data->hwmon_dev);
285 		goto error_remove;
286 	}
287 
288 	return 0;
289 
290 error_remove:
291 	sysfs_remove_group(&dev->kobj, &smsc47b397_group);
292 	return err;
293 }
294 
295 static int __init smsc47b397_device_add(unsigned short address)
296 {
297 	struct resource res = {
298 		.start	= address,
299 		.end	= address + SMSC_EXTENT - 1,
300 		.name	= DRVNAME,
301 		.flags	= IORESOURCE_IO,
302 	};
303 	int err;
304 
305 	err = acpi_check_resource_conflict(&res);
306 	if (err)
307 		goto exit;
308 
309 	pdev = platform_device_alloc(DRVNAME, address);
310 	if (!pdev) {
311 		err = -ENOMEM;
312 		pr_err("Device allocation failed\n");
313 		goto exit;
314 	}
315 
316 	err = platform_device_add_resources(pdev, &res, 1);
317 	if (err) {
318 		pr_err("Device resource addition failed (%d)\n", err);
319 		goto exit_device_put;
320 	}
321 
322 	err = platform_device_add(pdev);
323 	if (err) {
324 		pr_err("Device addition failed (%d)\n", err);
325 		goto exit_device_put;
326 	}
327 
328 	return 0;
329 
330 exit_device_put:
331 	platform_device_put(pdev);
332 exit:
333 	return err;
334 }
335 
336 static int __init smsc47b397_find(void)
337 {
338 	u8 id, rev;
339 	char *name;
340 	unsigned short addr;
341 
342 	superio_enter();
343 	id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
344 
345 	switch (id) {
346 	case 0x81:
347 		name = "SCH5307-NS";
348 		break;
349 	case 0x6f:
350 		name = "LPC47B397-NC";
351 		break;
352 	case 0x85:
353 	case 0x8c:
354 		name = "SCH5317";
355 		break;
356 	default:
357 		superio_exit();
358 		return -ENODEV;
359 	}
360 
361 	rev = superio_inb(SUPERIO_REG_DEVREV);
362 
363 	superio_select(SUPERIO_REG_LD8);
364 	addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
365 		 |  superio_inb(SUPERIO_REG_BASE_LSB);
366 
367 	pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
368 		name, addr, rev);
369 
370 	superio_exit();
371 	return addr;
372 }
373 
374 static int __init smsc47b397_init(void)
375 {
376 	unsigned short address;
377 	int ret;
378 
379 	ret = smsc47b397_find();
380 	if (ret < 0)
381 		return ret;
382 	address = ret;
383 
384 	ret = platform_driver_register(&smsc47b397_driver);
385 	if (ret)
386 		goto exit;
387 
388 	/* Sets global pdev as a side effect */
389 	ret = smsc47b397_device_add(address);
390 	if (ret)
391 		goto exit_driver;
392 
393 	return 0;
394 
395 exit_driver:
396 	platform_driver_unregister(&smsc47b397_driver);
397 exit:
398 	return ret;
399 }
400 
401 static void __exit smsc47b397_exit(void)
402 {
403 	platform_device_unregister(pdev);
404 	platform_driver_unregister(&smsc47b397_driver);
405 }
406 
407 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
408 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
409 MODULE_LICENSE("GPL");
410 
411 module_init(smsc47b397_init);
412 module_exit(smsc47b397_exit);
413