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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * This driver handles the ADT7410 and compatible digital temperature sensors.
6 * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
7 * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
8 * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
9 */
10
11#include <linux/device.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/jiffies.h>
16#include <linux/hwmon.h>
17#include <linux/err.h>
18#include <linux/mutex.h>
19#include <linux/delay.h>
20#include <linux/interrupt.h>
21#include <linux/regmap.h>
22
23#include "adt7x10.h"
24
25/*
26 * ADT7X10 status
27 */
28#define ADT7X10_STAT_T_LOW (1 << 4)
29#define ADT7X10_STAT_T_HIGH (1 << 5)
30#define ADT7X10_STAT_T_CRIT (1 << 6)
31#define ADT7X10_STAT_NOT_RDY (1 << 7)
32
33/*
34 * ADT7X10 config
35 */
36#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
37#define ADT7X10_CT_POLARITY (1 << 2)
38#define ADT7X10_INT_POLARITY (1 << 3)
39#define ADT7X10_EVENT_MODE (1 << 4)
40#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
41#define ADT7X10_FULL (0 << 5 | 0 << 6)
42#define ADT7X10_PD (1 << 5 | 1 << 6)
43#define ADT7X10_RESOLUTION (1 << 7)
44
45/*
46 * ADT7X10 masks
47 */
48#define ADT7X10_T13_VALUE_MASK 0xFFF8
49#define ADT7X10_T_HYST_MASK 0xF
50
51/* straight from the datasheet */
52#define ADT7X10_TEMP_MIN (-55000)
53#define ADT7X10_TEMP_MAX 150000
54
55/* Each client has this additional data */
56struct adt7x10_data {
57 struct regmap *regmap;
58 struct mutex update_lock;
59 u8 config;
60 u8 oldconfig;
61 bool valid; /* true if temperature valid */
62};
63
64enum {
65 adt7x10_temperature = 0,
66 adt7x10_t_alarm_high,
67 adt7x10_t_alarm_low,
68 adt7x10_t_crit,
69};
70
71static const u8 ADT7X10_REG_TEMP[] = {
72 [adt7x10_temperature] = ADT7X10_TEMPERATURE, /* input */
73 [adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH, /* high */
74 [adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW, /* low */
75 [adt7x10_t_crit] = ADT7X10_T_CRIT, /* critical */
76};
77
78static irqreturn_t adt7x10_irq_handler(int irq, void *private)
79{
80 struct device *dev = private;
81 struct adt7x10_data *d = dev_get_drvdata(dev);
82 unsigned int status;
83 int ret;
84
85 ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
86 if (ret < 0)
87 return IRQ_HANDLED;
88
89 if (status & ADT7X10_STAT_T_HIGH)
90 hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
91 if (status & ADT7X10_STAT_T_LOW)
92 hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
93 if (status & ADT7X10_STAT_T_CRIT)
94 hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);
95
96 return IRQ_HANDLED;
97}
98
99static int adt7x10_temp_ready(struct regmap *regmap)
100{
101 unsigned int status;
102 int i, ret;
103
104 for (i = 0; i < 6; i++) {
105 ret = regmap_read(regmap, ADT7X10_STATUS, &status);
106 if (ret < 0)
107 return ret;
108 if (!(status & ADT7X10_STAT_NOT_RDY))
109 return 0;
110 msleep(60);
111 }
112 return -ETIMEDOUT;
113}
114
115static s16 ADT7X10_TEMP_TO_REG(long temp)
116{
117 return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
118 ADT7X10_TEMP_MAX) * 128, 1000);
119}
120
121static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
122{
123 /* in 13 bit mode, bits 0-2 are status flags - mask them out */
124 if (!(data->config & ADT7X10_RESOLUTION))
125 reg &= ADT7X10_T13_VALUE_MASK;
126 /*
127 * temperature is stored in twos complement format, in steps of
128 * 1/128°C
129 */
130 return DIV_ROUND_CLOSEST(reg * 1000, 128);
131}
132
133/*-----------------------------------------------------------------------*/
134
135static int adt7x10_temp_read(struct adt7x10_data *data, int index, long *val)
136{
137 unsigned int regval;
138 int ret;
139
140 mutex_lock(&data->update_lock);
141 if (index == adt7x10_temperature && !data->valid) {
142 /* wait for valid temperature */
143 ret = adt7x10_temp_ready(data->regmap);
144 if (ret) {
145 mutex_unlock(&data->update_lock);
146 return ret;
147 }
148 data->valid = true;
149 }
150 mutex_unlock(&data->update_lock);
151
152 ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], ®val);
153 if (ret)
154 return ret;
155
156 *val = ADT7X10_REG_TO_TEMP(data, regval);
157 return 0;
158}
159
160static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
161{
162 int ret;
163
164 mutex_lock(&data->update_lock);
165 ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
166 ADT7X10_TEMP_TO_REG(temp));
167 mutex_unlock(&data->update_lock);
168 return ret;
169}
170
171static int adt7x10_hyst_read(struct adt7x10_data *data, int index, long *val)
172{
173 int hyst, temp, ret;
174
175 mutex_lock(&data->update_lock);
176 ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
177 if (ret) {
178 mutex_unlock(&data->update_lock);
179 return ret;
180 }
181
182 ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
183 mutex_unlock(&data->update_lock);
184 if (ret)
185 return ret;
186
187 hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;
188
189 /*
190 * hysteresis is stored as a 4 bit offset in the device, convert it
191 * to an absolute value
192 */
193 /* min has positive offset, others have negative */
194 if (index == adt7x10_t_alarm_low)
195 hyst = -hyst;
196
197 *val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
198 return 0;
199}
200
201static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
202{
203 unsigned int regval;
204 int limit, ret;
205
206 mutex_lock(&data->update_lock);
207
208 /* convert absolute hysteresis value to a 4 bit delta value */
209 ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, ®val);
210 if (ret < 0)
211 goto abort;
212
213 limit = ADT7X10_REG_TO_TEMP(data, regval);
214
215 hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
216 regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
217 ADT7X10_T_HYST_MASK);
218 ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
219abort:
220 mutex_unlock(&data->update_lock);
221 return ret;
222}
223
224static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
225{
226 unsigned int status;
227 int ret;
228
229 ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
230 if (ret < 0)
231 return ret;
232
233 *val = !!(status & index);
234
235 return 0;
236}
237
238static umode_t adt7x10_is_visible(const void *data,
239 enum hwmon_sensor_types type,
240 u32 attr, int channel)
241{
242 switch (attr) {
243 case hwmon_temp_max:
244 case hwmon_temp_min:
245 case hwmon_temp_crit:
246 case hwmon_temp_max_hyst:
247 return 0644;
248 case hwmon_temp_input:
249 case hwmon_temp_min_alarm:
250 case hwmon_temp_max_alarm:
251 case hwmon_temp_crit_alarm:
252 case hwmon_temp_min_hyst:
253 case hwmon_temp_crit_hyst:
254 return 0444;
255 default:
256 break;
257 }
258
259 return 0;
260}
261
262static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
263 u32 attr, int channel, long *val)
264{
265 struct adt7x10_data *data = dev_get_drvdata(dev);
266
267 switch (attr) {
268 case hwmon_temp_input:
269 return adt7x10_temp_read(data, adt7x10_temperature, val);
270 case hwmon_temp_max:
271 return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
272 case hwmon_temp_min:
273 return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
274 case hwmon_temp_crit:
275 return adt7x10_temp_read(data, adt7x10_t_crit, val);
276 case hwmon_temp_max_hyst:
277 return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
278 case hwmon_temp_min_hyst:
279 return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
280 case hwmon_temp_crit_hyst:
281 return adt7x10_hyst_read(data, adt7x10_t_crit, val);
282 case hwmon_temp_min_alarm:
283 return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
284 case hwmon_temp_max_alarm:
285 return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
286 case hwmon_temp_crit_alarm:
287 return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
288 default:
289 return -EOPNOTSUPP;
290 }
291}
292
293static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
294 u32 attr, int channel, long val)
295{
296 struct adt7x10_data *data = dev_get_drvdata(dev);
297
298 switch (attr) {
299 case hwmon_temp_max:
300 return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
301 case hwmon_temp_min:
302 return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
303 case hwmon_temp_crit:
304 return adt7x10_temp_write(data, adt7x10_t_crit, val);
305 case hwmon_temp_max_hyst:
306 return adt7x10_hyst_write(data, val);
307 default:
308 return -EOPNOTSUPP;
309 }
310}
311
312static const struct hwmon_channel_info * const adt7x10_info[] = {
313 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
314 HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
315 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
316 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
317 NULL,
318};
319
320static const struct hwmon_ops adt7x10_hwmon_ops = {
321 .is_visible = adt7x10_is_visible,
322 .read = adt7x10_read,
323 .write = adt7x10_write,
324};
325
326static const struct hwmon_chip_info adt7x10_chip_info = {
327 .ops = &adt7x10_hwmon_ops,
328 .info = adt7x10_info,
329};
330
331static void adt7x10_restore_config(void *private)
332{
333 struct adt7x10_data *data = private;
334
335 regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
336}
337
338int adt7x10_probe(struct device *dev, const char *name, int irq,
339 struct regmap *regmap)
340{
341 struct adt7x10_data *data;
342 unsigned int config;
343 struct device *hdev;
344 int ret;
345
346 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
347 if (!data)
348 return -ENOMEM;
349
350 data->regmap = regmap;
351
352 dev_set_drvdata(dev, data);
353 mutex_init(&data->update_lock);
354
355 /* configure as specified */
356 ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
357 if (ret < 0) {
358 dev_dbg(dev, "Can't read config? %d\n", ret);
359 return ret;
360 }
361 data->oldconfig = config;
362
363 /*
364 * Set to 16 bit resolution, continous conversion and comparator mode.
365 */
366 data->config = data->oldconfig;
367 data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
368 ADT7X10_INT_POLARITY);
369 data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
370
371 if (data->config != data->oldconfig) {
372 ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
373 if (ret)
374 return ret;
375 ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
376 if (ret)
377 return ret;
378 }
379 dev_dbg(dev, "Config %02x\n", data->config);
380
381 hdev = devm_hwmon_device_register_with_info(dev, name, data,
382 &adt7x10_chip_info, NULL);
383 if (IS_ERR(hdev))
384 return PTR_ERR(hdev);
385
386 if (irq > 0) {
387 ret = devm_request_threaded_irq(dev, irq, NULL,
388 adt7x10_irq_handler,
389 IRQF_TRIGGER_FALLING |
390 IRQF_ONESHOT,
391 dev_name(dev), hdev);
392 if (ret)
393 return ret;
394 }
395
396 return 0;
397}
398EXPORT_SYMBOL_GPL(adt7x10_probe);
399
400static int adt7x10_suspend(struct device *dev)
401{
402 struct adt7x10_data *data = dev_get_drvdata(dev);
403
404 return regmap_write(data->regmap, ADT7X10_CONFIG,
405 data->config | ADT7X10_PD);
406}
407
408static int adt7x10_resume(struct device *dev)
409{
410 struct adt7x10_data *data = dev_get_drvdata(dev);
411
412 return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
413}
414
415EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
416
417MODULE_AUTHOR("Hartmut Knaack");
418MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
419MODULE_LICENSE("GPL");
1/*
2 * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * This driver handles the ADT7410 and compatible digital temperature sensors.
5 * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
6 * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
7 * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/hwmon.h>
29#include <linux/hwmon-sysfs.h>
30#include <linux/err.h>
31#include <linux/mutex.h>
32#include <linux/delay.h>
33#include <linux/interrupt.h>
34
35#include "adt7x10.h"
36
37/*
38 * ADT7X10 status
39 */
40#define ADT7X10_STAT_T_LOW (1 << 4)
41#define ADT7X10_STAT_T_HIGH (1 << 5)
42#define ADT7X10_STAT_T_CRIT (1 << 6)
43#define ADT7X10_STAT_NOT_RDY (1 << 7)
44
45/*
46 * ADT7X10 config
47 */
48#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
49#define ADT7X10_CT_POLARITY (1 << 2)
50#define ADT7X10_INT_POLARITY (1 << 3)
51#define ADT7X10_EVENT_MODE (1 << 4)
52#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
53#define ADT7X10_FULL (0 << 5 | 0 << 6)
54#define ADT7X10_PD (1 << 5 | 1 << 6)
55#define ADT7X10_RESOLUTION (1 << 7)
56
57/*
58 * ADT7X10 masks
59 */
60#define ADT7X10_T13_VALUE_MASK 0xFFF8
61#define ADT7X10_T_HYST_MASK 0xF
62
63/* straight from the datasheet */
64#define ADT7X10_TEMP_MIN (-55000)
65#define ADT7X10_TEMP_MAX 150000
66
67/* Each client has this additional data */
68struct adt7x10_data {
69 const struct adt7x10_ops *ops;
70 const char *name;
71 struct device *hwmon_dev;
72 struct mutex update_lock;
73 u8 config;
74 u8 oldconfig;
75 bool valid; /* true if registers valid */
76 unsigned long last_updated; /* In jiffies */
77 s16 temp[4]; /* Register values,
78 0 = input
79 1 = high
80 2 = low
81 3 = critical */
82 u8 hyst; /* hysteresis offset */
83};
84
85static int adt7x10_read_byte(struct device *dev, u8 reg)
86{
87 struct adt7x10_data *d = dev_get_drvdata(dev);
88 return d->ops->read_byte(dev, reg);
89}
90
91static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
92{
93 struct adt7x10_data *d = dev_get_drvdata(dev);
94 return d->ops->write_byte(dev, reg, data);
95}
96
97static int adt7x10_read_word(struct device *dev, u8 reg)
98{
99 struct adt7x10_data *d = dev_get_drvdata(dev);
100 return d->ops->read_word(dev, reg);
101}
102
103static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
104{
105 struct adt7x10_data *d = dev_get_drvdata(dev);
106 return d->ops->write_word(dev, reg, data);
107}
108
109static const u8 ADT7X10_REG_TEMP[4] = {
110 ADT7X10_TEMPERATURE, /* input */
111 ADT7X10_T_ALARM_HIGH, /* high */
112 ADT7X10_T_ALARM_LOW, /* low */
113 ADT7X10_T_CRIT, /* critical */
114};
115
116static irqreturn_t adt7x10_irq_handler(int irq, void *private)
117{
118 struct device *dev = private;
119 int status;
120
121 status = adt7x10_read_byte(dev, ADT7X10_STATUS);
122 if (status < 0)
123 return IRQ_HANDLED;
124
125 if (status & ADT7X10_STAT_T_HIGH)
126 sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm");
127 if (status & ADT7X10_STAT_T_LOW)
128 sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm");
129 if (status & ADT7X10_STAT_T_CRIT)
130 sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm");
131
132 return IRQ_HANDLED;
133}
134
135static int adt7x10_temp_ready(struct device *dev)
136{
137 int i, status;
138
139 for (i = 0; i < 6; i++) {
140 status = adt7x10_read_byte(dev, ADT7X10_STATUS);
141 if (status < 0)
142 return status;
143 if (!(status & ADT7X10_STAT_NOT_RDY))
144 return 0;
145 msleep(60);
146 }
147 return -ETIMEDOUT;
148}
149
150static int adt7x10_update_temp(struct device *dev)
151{
152 struct adt7x10_data *data = dev_get_drvdata(dev);
153 int ret = 0;
154
155 mutex_lock(&data->update_lock);
156
157 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
158 || !data->valid) {
159 int temp;
160
161 dev_dbg(dev, "Starting update\n");
162
163 ret = adt7x10_temp_ready(dev); /* check for new value */
164 if (ret)
165 goto abort;
166
167 temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
168 if (temp < 0) {
169 ret = temp;
170 dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
171 ADT7X10_REG_TEMP[0], ret);
172 goto abort;
173 }
174 data->temp[0] = temp;
175 data->last_updated = jiffies;
176 data->valid = true;
177 }
178
179abort:
180 mutex_unlock(&data->update_lock);
181 return ret;
182}
183
184static int adt7x10_fill_cache(struct device *dev)
185{
186 struct adt7x10_data *data = dev_get_drvdata(dev);
187 int ret;
188 int i;
189
190 for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
191 ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
192 if (ret < 0) {
193 dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
194 ADT7X10_REG_TEMP[i], ret);
195 return ret;
196 }
197 data->temp[i] = ret;
198 }
199
200 ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
201 if (ret < 0) {
202 dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
203 ADT7X10_T_HYST, ret);
204 return ret;
205 }
206 data->hyst = ret;
207
208 return 0;
209}
210
211static s16 ADT7X10_TEMP_TO_REG(long temp)
212{
213 return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
214 ADT7X10_TEMP_MAX) * 128, 1000);
215}
216
217static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
218{
219 /* in 13 bit mode, bits 0-2 are status flags - mask them out */
220 if (!(data->config & ADT7X10_RESOLUTION))
221 reg &= ADT7X10_T13_VALUE_MASK;
222 /*
223 * temperature is stored in twos complement format, in steps of
224 * 1/128°C
225 */
226 return DIV_ROUND_CLOSEST(reg * 1000, 128);
227}
228
229/*-----------------------------------------------------------------------*/
230
231/* sysfs attributes for hwmon */
232
233static ssize_t adt7x10_show_temp(struct device *dev,
234 struct device_attribute *da,
235 char *buf)
236{
237 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
238 struct adt7x10_data *data = dev_get_drvdata(dev);
239
240
241 if (attr->index == 0) {
242 int ret;
243
244 ret = adt7x10_update_temp(dev);
245 if (ret)
246 return ret;
247 }
248
249 return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
250 data->temp[attr->index]));
251}
252
253static ssize_t adt7x10_set_temp(struct device *dev,
254 struct device_attribute *da,
255 const char *buf, size_t count)
256{
257 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
258 struct adt7x10_data *data = dev_get_drvdata(dev);
259 int nr = attr->index;
260 long temp;
261 int ret;
262
263 ret = kstrtol(buf, 10, &temp);
264 if (ret)
265 return ret;
266
267 mutex_lock(&data->update_lock);
268 data->temp[nr] = ADT7X10_TEMP_TO_REG(temp);
269 ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]);
270 if (ret)
271 count = ret;
272 mutex_unlock(&data->update_lock);
273 return count;
274}
275
276static ssize_t adt7x10_show_t_hyst(struct device *dev,
277 struct device_attribute *da,
278 char *buf)
279{
280 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
281 struct adt7x10_data *data = dev_get_drvdata(dev);
282 int nr = attr->index;
283 int hyst;
284
285 hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000;
286
287 /*
288 * hysteresis is stored as a 4 bit offset in the device, convert it
289 * to an absolute value
290 */
291 if (nr == 2) /* min has positive offset, others have negative */
292 hyst = -hyst;
293 return sprintf(buf, "%d\n",
294 ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
295}
296
297static ssize_t adt7x10_set_t_hyst(struct device *dev,
298 struct device_attribute *da,
299 const char *buf, size_t count)
300{
301 struct adt7x10_data *data = dev_get_drvdata(dev);
302 int limit, ret;
303 long hyst;
304
305 ret = kstrtol(buf, 10, &hyst);
306 if (ret)
307 return ret;
308 /* convert absolute hysteresis value to a 4 bit delta value */
309 limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
310 hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
311 data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
312 0, ADT7X10_T_HYST_MASK);
313 ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst);
314 if (ret)
315 return ret;
316
317 return count;
318}
319
320static ssize_t adt7x10_show_alarm(struct device *dev,
321 struct device_attribute *da,
322 char *buf)
323{
324 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
325 int ret;
326
327 ret = adt7x10_read_byte(dev, ADT7X10_STATUS);
328 if (ret < 0)
329 return ret;
330
331 return sprintf(buf, "%d\n", !!(ret & attr->index));
332}
333
334static ssize_t adt7x10_show_name(struct device *dev,
335 struct device_attribute *da,
336 char *buf)
337{
338 struct adt7x10_data *data = dev_get_drvdata(dev);
339
340 return sprintf(buf, "%s\n", data->name);
341}
342
343static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7x10_show_temp, NULL, 0);
344static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
345 adt7x10_show_temp, adt7x10_set_temp, 1);
346static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
347 adt7x10_show_temp, adt7x10_set_temp, 2);
348static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
349 adt7x10_show_temp, adt7x10_set_temp, 3);
350static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
351 adt7x10_show_t_hyst, adt7x10_set_t_hyst, 1);
352static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
353 adt7x10_show_t_hyst, NULL, 2);
354static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
355 adt7x10_show_t_hyst, NULL, 3);
356static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7x10_show_alarm,
357 NULL, ADT7X10_STAT_T_LOW);
358static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7x10_show_alarm,
359 NULL, ADT7X10_STAT_T_HIGH);
360static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7x10_show_alarm,
361 NULL, ADT7X10_STAT_T_CRIT);
362static DEVICE_ATTR(name, S_IRUGO, adt7x10_show_name, NULL);
363
364static struct attribute *adt7x10_attributes[] = {
365 &sensor_dev_attr_temp1_input.dev_attr.attr,
366 &sensor_dev_attr_temp1_max.dev_attr.attr,
367 &sensor_dev_attr_temp1_min.dev_attr.attr,
368 &sensor_dev_attr_temp1_crit.dev_attr.attr,
369 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
370 &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
371 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
372 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
373 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
374 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
375 NULL
376};
377
378static const struct attribute_group adt7x10_group = {
379 .attrs = adt7x10_attributes,
380};
381
382int adt7x10_probe(struct device *dev, const char *name, int irq,
383 const struct adt7x10_ops *ops)
384{
385 struct adt7x10_data *data;
386 int ret;
387
388 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
389 if (!data)
390 return -ENOMEM;
391
392 data->ops = ops;
393 data->name = name;
394
395 dev_set_drvdata(dev, data);
396 mutex_init(&data->update_lock);
397
398 /* configure as specified */
399 ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
400 if (ret < 0) {
401 dev_dbg(dev, "Can't read config? %d\n", ret);
402 return ret;
403 }
404 data->oldconfig = ret;
405
406 /*
407 * Set to 16 bit resolution, continous conversion and comparator mode.
408 */
409 data->config = data->oldconfig;
410 data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
411 ADT7X10_INT_POLARITY);
412 data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
413
414 if (data->config != data->oldconfig) {
415 ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
416 if (ret)
417 return ret;
418 }
419 dev_dbg(dev, "Config %02x\n", data->config);
420
421 ret = adt7x10_fill_cache(dev);
422 if (ret)
423 goto exit_restore;
424
425 /* Register sysfs hooks */
426 ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
427 if (ret)
428 goto exit_restore;
429
430 /*
431 * The I2C device will already have it's own 'name' attribute, but for
432 * the SPI device we need to register it. name will only be non NULL if
433 * the device doesn't register the 'name' attribute on its own.
434 */
435 if (name) {
436 ret = device_create_file(dev, &dev_attr_name);
437 if (ret)
438 goto exit_remove;
439 }
440
441 data->hwmon_dev = hwmon_device_register(dev);
442 if (IS_ERR(data->hwmon_dev)) {
443 ret = PTR_ERR(data->hwmon_dev);
444 goto exit_remove_name;
445 }
446
447 if (irq > 0) {
448 ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler,
449 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
450 dev_name(dev), dev);
451 if (ret)
452 goto exit_hwmon_device_unregister;
453 }
454
455 return 0;
456
457exit_hwmon_device_unregister:
458 hwmon_device_unregister(data->hwmon_dev);
459exit_remove_name:
460 if (name)
461 device_remove_file(dev, &dev_attr_name);
462exit_remove:
463 sysfs_remove_group(&dev->kobj, &adt7x10_group);
464exit_restore:
465 adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
466 return ret;
467}
468EXPORT_SYMBOL_GPL(adt7x10_probe);
469
470int adt7x10_remove(struct device *dev, int irq)
471{
472 struct adt7x10_data *data = dev_get_drvdata(dev);
473
474 if (irq > 0)
475 free_irq(irq, dev);
476
477 hwmon_device_unregister(data->hwmon_dev);
478 if (data->name)
479 device_remove_file(dev, &dev_attr_name);
480 sysfs_remove_group(&dev->kobj, &adt7x10_group);
481 if (data->oldconfig != data->config)
482 adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
483 return 0;
484}
485EXPORT_SYMBOL_GPL(adt7x10_remove);
486
487#ifdef CONFIG_PM_SLEEP
488
489static int adt7x10_suspend(struct device *dev)
490{
491 struct adt7x10_data *data = dev_get_drvdata(dev);
492
493 return adt7x10_write_byte(dev, ADT7X10_CONFIG,
494 data->config | ADT7X10_PD);
495}
496
497static int adt7x10_resume(struct device *dev)
498{
499 struct adt7x10_data *data = dev_get_drvdata(dev);
500
501 return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
502}
503
504SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
505EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);
506
507#endif /* CONFIG_PM_SLEEP */
508
509MODULE_AUTHOR("Hartmut Knaack");
510MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
511MODULE_LICENSE("GPL");