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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 unsigned int regs[2] = {ADT7X10_T_HYST, ADT7X10_REG_TEMP[index]};
174 int hyst, ret;
175 u16 regdata[2];
176
177 ret = regmap_multi_reg_read(data->regmap, regs, regdata, 2);
178 if (ret)
179 return ret;
180
181 hyst = (regdata[0] & ADT7X10_T_HYST_MASK) * 1000;
182
183 /*
184 * hysteresis is stored as a 4 bit offset in the device, convert it
185 * to an absolute value
186 */
187 /* min has positive offset, others have negative */
188 if (index == adt7x10_t_alarm_low)
189 hyst = -hyst;
190
191 *val = ADT7X10_REG_TO_TEMP(data, regdata[1]) - hyst;
192 return 0;
193}
194
195static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
196{
197 unsigned int regval;
198 int limit, ret;
199
200 mutex_lock(&data->update_lock);
201
202 /* convert absolute hysteresis value to a 4 bit delta value */
203 ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, ®val);
204 if (ret < 0)
205 goto abort;
206
207 limit = ADT7X10_REG_TO_TEMP(data, regval);
208
209 hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
210 regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
211 ADT7X10_T_HYST_MASK);
212 ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
213abort:
214 mutex_unlock(&data->update_lock);
215 return ret;
216}
217
218static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
219{
220 unsigned int status;
221 int ret;
222
223 ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
224 if (ret < 0)
225 return ret;
226
227 *val = !!(status & index);
228
229 return 0;
230}
231
232static umode_t adt7x10_is_visible(const void *data,
233 enum hwmon_sensor_types type,
234 u32 attr, int channel)
235{
236 switch (attr) {
237 case hwmon_temp_max:
238 case hwmon_temp_min:
239 case hwmon_temp_crit:
240 case hwmon_temp_max_hyst:
241 return 0644;
242 case hwmon_temp_input:
243 case hwmon_temp_min_alarm:
244 case hwmon_temp_max_alarm:
245 case hwmon_temp_crit_alarm:
246 case hwmon_temp_min_hyst:
247 case hwmon_temp_crit_hyst:
248 return 0444;
249 default:
250 break;
251 }
252
253 return 0;
254}
255
256static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
257 u32 attr, int channel, long *val)
258{
259 struct adt7x10_data *data = dev_get_drvdata(dev);
260
261 switch (attr) {
262 case hwmon_temp_input:
263 return adt7x10_temp_read(data, adt7x10_temperature, val);
264 case hwmon_temp_max:
265 return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
266 case hwmon_temp_min:
267 return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
268 case hwmon_temp_crit:
269 return adt7x10_temp_read(data, adt7x10_t_crit, val);
270 case hwmon_temp_max_hyst:
271 return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
272 case hwmon_temp_min_hyst:
273 return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
274 case hwmon_temp_crit_hyst:
275 return adt7x10_hyst_read(data, adt7x10_t_crit, val);
276 case hwmon_temp_min_alarm:
277 return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
278 case hwmon_temp_max_alarm:
279 return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
280 case hwmon_temp_crit_alarm:
281 return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
282 default:
283 return -EOPNOTSUPP;
284 }
285}
286
287static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
288 u32 attr, int channel, long val)
289{
290 struct adt7x10_data *data = dev_get_drvdata(dev);
291
292 switch (attr) {
293 case hwmon_temp_max:
294 return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
295 case hwmon_temp_min:
296 return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
297 case hwmon_temp_crit:
298 return adt7x10_temp_write(data, adt7x10_t_crit, val);
299 case hwmon_temp_max_hyst:
300 return adt7x10_hyst_write(data, val);
301 default:
302 return -EOPNOTSUPP;
303 }
304}
305
306static const struct hwmon_channel_info * const adt7x10_info[] = {
307 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
308 HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
309 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
310 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
311 NULL,
312};
313
314static const struct hwmon_ops adt7x10_hwmon_ops = {
315 .is_visible = adt7x10_is_visible,
316 .read = adt7x10_read,
317 .write = adt7x10_write,
318};
319
320static const struct hwmon_chip_info adt7x10_chip_info = {
321 .ops = &adt7x10_hwmon_ops,
322 .info = adt7x10_info,
323};
324
325static void adt7x10_restore_config(void *private)
326{
327 struct adt7x10_data *data = private;
328
329 regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
330}
331
332int adt7x10_probe(struct device *dev, const char *name, int irq,
333 struct regmap *regmap)
334{
335 struct adt7x10_data *data;
336 unsigned int config;
337 struct device *hdev;
338 int ret;
339
340 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
341 if (!data)
342 return -ENOMEM;
343
344 data->regmap = regmap;
345
346 dev_set_drvdata(dev, data);
347 mutex_init(&data->update_lock);
348
349 /* configure as specified */
350 ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
351 if (ret < 0) {
352 dev_dbg(dev, "Can't read config? %d\n", ret);
353 return ret;
354 }
355 data->oldconfig = config;
356
357 /*
358 * Set to 16 bit resolution, continous conversion and comparator mode.
359 */
360 data->config = data->oldconfig;
361 data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
362 ADT7X10_INT_POLARITY);
363 data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
364
365 if (data->config != data->oldconfig) {
366 ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
367 if (ret)
368 return ret;
369 ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
370 if (ret)
371 return ret;
372 }
373 dev_dbg(dev, "Config %02x\n", data->config);
374
375 hdev = devm_hwmon_device_register_with_info(dev, name, data,
376 &adt7x10_chip_info, NULL);
377 if (IS_ERR(hdev))
378 return PTR_ERR(hdev);
379
380 if (irq > 0) {
381 ret = devm_request_threaded_irq(dev, irq, NULL,
382 adt7x10_irq_handler,
383 IRQF_TRIGGER_FALLING |
384 IRQF_ONESHOT,
385 dev_name(dev), hdev);
386 if (ret)
387 return ret;
388 }
389
390 return 0;
391}
392EXPORT_SYMBOL_GPL(adt7x10_probe);
393
394static int adt7x10_suspend(struct device *dev)
395{
396 struct adt7x10_data *data = dev_get_drvdata(dev);
397
398 return regmap_write(data->regmap, ADT7X10_CONFIG,
399 data->config | ADT7X10_PD);
400}
401
402static int adt7x10_resume(struct device *dev)
403{
404 struct adt7x10_data *data = dev_get_drvdata(dev);
405
406 return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
407}
408
409EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
410
411MODULE_AUTHOR("Hartmut Knaack");
412MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
413MODULE_LICENSE("GPL");