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 */
56 struct 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
64 enum {
65 adt7x10_temperature = 0,
66 adt7x10_t_alarm_high,
67 adt7x10_t_alarm_low,
68 adt7x10_t_crit,
69 };
70
71 static 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
adt7x10_irq_handler(int irq,void * private)78 static 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
adt7x10_temp_ready(struct regmap * regmap)99 static 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
ADT7X10_TEMP_TO_REG(long temp)115 static 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
ADT7X10_REG_TO_TEMP(struct adt7x10_data * data,s16 reg)121 static 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
adt7x10_temp_read(struct adt7x10_data * data,int index,long * val)135 static 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
adt7x10_temp_write(struct adt7x10_data * data,int index,long temp)160 static 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
adt7x10_hyst_read(struct adt7x10_data * data,int index,long * val)171 static 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
adt7x10_hyst_write(struct adt7x10_data * data,long hyst)201 static 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);
219 abort:
220 mutex_unlock(&data->update_lock);
221 return ret;
222 }
223
adt7x10_alarm_read(struct adt7x10_data * data,int index,long * val)224 static 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
adt7x10_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)238 static 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
adt7x10_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)262 static 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
adt7x10_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)293 static 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
312 static 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
320 static const struct hwmon_ops adt7x10_hwmon_ops = {
321 .is_visible = adt7x10_is_visible,
322 .read = adt7x10_read,
323 .write = adt7x10_write,
324 };
325
326 static const struct hwmon_chip_info adt7x10_chip_info = {
327 .ops = &adt7x10_hwmon_ops,
328 .info = adt7x10_info,
329 };
330
adt7x10_restore_config(void * private)331 static 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
adt7x10_probe(struct device * dev,const char * name,int irq,struct regmap * regmap)338 int 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 }
398 EXPORT_SYMBOL_GPL(adt7x10_probe);
399
adt7x10_suspend(struct device * dev)400 static 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
adt7x10_resume(struct device * dev)408 static 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
415 EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
416
417 MODULE_AUTHOR("Hartmut Knaack");
418 MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
419 MODULE_LICENSE("GPL");
420