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20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/jiffies.h>
24#include <linux/i2c.h>
25#include <linux/hwmon.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/err.h>
28#include <linux/mutex.h>
29#include <linux/delay.h>
30
31#define ADC_STEP_MV 2
32#define ADC_MAX_LOW_MEASUREMENT_MV 2000
33
34enum powr1220_regs {
35 VMON_STATUS0,
36 VMON_STATUS1,
37 VMON_STATUS2,
38 OUTPUT_STATUS0,
39 OUTPUT_STATUS1,
40 OUTPUT_STATUS2,
41 INPUT_STATUS,
42 ADC_VALUE_LOW,
43 ADC_VALUE_HIGH,
44 ADC_MUX,
45 UES_BYTE0,
46 UES_BYTE1,
47 UES_BYTE2,
48 UES_BYTE3,
49 GP_OUTPUT1,
50 GP_OUTPUT2,
51 GP_OUTPUT3,
52 INPUT_VALUE,
53 RESET,
54 TRIM1_TRIM,
55 TRIM2_TRIM,
56 TRIM3_TRIM,
57 TRIM4_TRIM,
58 TRIM5_TRIM,
59 TRIM6_TRIM,
60 TRIM7_TRIM,
61 TRIM8_TRIM,
62 MAX_POWR1220_REGS
63};
64
65enum powr1220_adc_values {
66 VMON1,
67 VMON2,
68 VMON3,
69 VMON4,
70 VMON5,
71 VMON6,
72 VMON7,
73 VMON8,
74 VMON9,
75 VMON10,
76 VMON11,
77 VMON12,
78 VCCA,
79 VCCINP,
80 MAX_POWR1220_ADC_VALUES
81};
82
83struct powr1220_data {
84 struct i2c_client *client;
85 struct mutex update_lock;
86 bool adc_valid[MAX_POWR1220_ADC_VALUES];
87
88 unsigned long adc_last_updated[MAX_POWR1220_ADC_VALUES];
89
90
91 int adc_maxes[MAX_POWR1220_ADC_VALUES];
92 int adc_values[MAX_POWR1220_ADC_VALUES];
93};
94
95static const char * const input_names[] = {
96 [VMON1] = "vmon1",
97 [VMON2] = "vmon2",
98 [VMON3] = "vmon3",
99 [VMON4] = "vmon4",
100 [VMON5] = "vmon5",
101 [VMON6] = "vmon6",
102 [VMON7] = "vmon7",
103 [VMON8] = "vmon8",
104 [VMON9] = "vmon9",
105 [VMON10] = "vmon10",
106 [VMON11] = "vmon11",
107 [VMON12] = "vmon12",
108 [VCCA] = "vcca",
109 [VCCINP] = "vccinp",
110};
111
112
113static int powr1220_read_adc(struct device *dev, int ch_num)
114{
115 struct powr1220_data *data = dev_get_drvdata(dev);
116 int reading;
117 int result;
118 int adc_range = 0;
119
120 mutex_lock(&data->update_lock);
121
122 if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||
123 !data->adc_valid[ch_num]) {
124
125
126
127
128
129
130 if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||
131 data->adc_maxes[ch_num] == 0)
132 adc_range = 1 << 4;
133
134
135 result = i2c_smbus_write_byte_data(data->client, ADC_MUX,
136 adc_range | ch_num);
137 if (result)
138 goto exit;
139
140
141
142
143
144 udelay(200);
145
146
147 result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);
148 if (result < 0)
149 goto exit;
150
151 reading = result >> 4;
152
153
154 result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);
155 if (result < 0)
156 goto exit;
157
158 reading |= result << 4;
159
160
161 reading *= ADC_STEP_MV;
162 data->adc_values[ch_num] = reading;
163 data->adc_valid[ch_num] = true;
164 data->adc_last_updated[ch_num] = jiffies;
165 result = reading;
166
167 if (reading > data->adc_maxes[ch_num])
168 data->adc_maxes[ch_num] = reading;
169 } else {
170 result = data->adc_values[ch_num];
171 }
172
173exit:
174 mutex_unlock(&data->update_lock);
175
176 return result;
177}
178
179
180static ssize_t powr1220_show_voltage(struct device *dev,
181 struct device_attribute *dev_attr, char *buf)
182{
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
184 int adc_val = powr1220_read_adc(dev, attr->index);
185
186 if (adc_val < 0)
187 return adc_val;
188
189 return sprintf(buf, "%d\n", adc_val);
190}
191
192
193static ssize_t powr1220_show_max(struct device *dev,
194 struct device_attribute *dev_attr, char *buf)
195{
196 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
197 struct powr1220_data *data = dev_get_drvdata(dev);
198
199 return sprintf(buf, "%d\n", data->adc_maxes[attr->index]);
200}
201
202
203static ssize_t powr1220_show_label(struct device *dev,
204 struct device_attribute *dev_attr, char *buf)
205{
206 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
207
208 return sprintf(buf, "%s\n", input_names[attr->index]);
209}
210
211static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, powr1220_show_voltage, NULL,
212 VMON1);
213static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, powr1220_show_voltage, NULL,
214 VMON2);
215static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, powr1220_show_voltage, NULL,
216 VMON3);
217static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, powr1220_show_voltage, NULL,
218 VMON4);
219static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, powr1220_show_voltage, NULL,
220 VMON5);
221static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, powr1220_show_voltage, NULL,
222 VMON6);
223static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, powr1220_show_voltage, NULL,
224 VMON7);
225static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, powr1220_show_voltage, NULL,
226 VMON8);
227static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, powr1220_show_voltage, NULL,
228 VMON9);
229static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, powr1220_show_voltage, NULL,
230 VMON10);
231static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, powr1220_show_voltage, NULL,
232 VMON11);
233static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, powr1220_show_voltage, NULL,
234 VMON12);
235static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, powr1220_show_voltage, NULL,
236 VCCA);
237static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, powr1220_show_voltage, NULL,
238 VCCINP);
239
240static SENSOR_DEVICE_ATTR(in0_highest, S_IRUGO, powr1220_show_max, NULL,
241 VMON1);
242static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, powr1220_show_max, NULL,
243 VMON2);
244static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, powr1220_show_max, NULL,
245 VMON3);
246static SENSOR_DEVICE_ATTR(in3_highest, S_IRUGO, powr1220_show_max, NULL,
247 VMON4);
248static SENSOR_DEVICE_ATTR(in4_highest, S_IRUGO, powr1220_show_max, NULL,
249 VMON5);
250static SENSOR_DEVICE_ATTR(in5_highest, S_IRUGO, powr1220_show_max, NULL,
251 VMON6);
252static SENSOR_DEVICE_ATTR(in6_highest, S_IRUGO, powr1220_show_max, NULL,
253 VMON7);
254static SENSOR_DEVICE_ATTR(in7_highest, S_IRUGO, powr1220_show_max, NULL,
255 VMON8);
256static SENSOR_DEVICE_ATTR(in8_highest, S_IRUGO, powr1220_show_max, NULL,
257 VMON9);
258static SENSOR_DEVICE_ATTR(in9_highest, S_IRUGO, powr1220_show_max, NULL,
259 VMON10);
260static SENSOR_DEVICE_ATTR(in10_highest, S_IRUGO, powr1220_show_max, NULL,
261 VMON11);
262static SENSOR_DEVICE_ATTR(in11_highest, S_IRUGO, powr1220_show_max, NULL,
263 VMON12);
264static SENSOR_DEVICE_ATTR(in12_highest, S_IRUGO, powr1220_show_max, NULL,
265 VCCA);
266static SENSOR_DEVICE_ATTR(in13_highest, S_IRUGO, powr1220_show_max, NULL,
267 VCCINP);
268
269static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, powr1220_show_label, NULL,
270 VMON1);
271static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, powr1220_show_label, NULL,
272 VMON2);
273static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, powr1220_show_label, NULL,
274 VMON3);
275static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, powr1220_show_label, NULL,
276 VMON4);
277static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, powr1220_show_label, NULL,
278 VMON5);
279static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, powr1220_show_label, NULL,
280 VMON6);
281static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, powr1220_show_label, NULL,
282 VMON7);
283static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, powr1220_show_label, NULL,
284 VMON8);
285static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, powr1220_show_label, NULL,
286 VMON9);
287static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, powr1220_show_label, NULL,
288 VMON10);
289static SENSOR_DEVICE_ATTR(in10_label, S_IRUGO, powr1220_show_label, NULL,
290 VMON11);
291static SENSOR_DEVICE_ATTR(in11_label, S_IRUGO, powr1220_show_label, NULL,
292 VMON12);
293static SENSOR_DEVICE_ATTR(in12_label, S_IRUGO, powr1220_show_label, NULL,
294 VCCA);
295static SENSOR_DEVICE_ATTR(in13_label, S_IRUGO, powr1220_show_label, NULL,
296 VCCINP);
297
298static struct attribute *powr1220_attrs[] = {
299 &sensor_dev_attr_in0_input.dev_attr.attr,
300 &sensor_dev_attr_in1_input.dev_attr.attr,
301 &sensor_dev_attr_in2_input.dev_attr.attr,
302 &sensor_dev_attr_in3_input.dev_attr.attr,
303 &sensor_dev_attr_in4_input.dev_attr.attr,
304 &sensor_dev_attr_in5_input.dev_attr.attr,
305 &sensor_dev_attr_in6_input.dev_attr.attr,
306 &sensor_dev_attr_in7_input.dev_attr.attr,
307 &sensor_dev_attr_in8_input.dev_attr.attr,
308 &sensor_dev_attr_in9_input.dev_attr.attr,
309 &sensor_dev_attr_in10_input.dev_attr.attr,
310 &sensor_dev_attr_in11_input.dev_attr.attr,
311 &sensor_dev_attr_in12_input.dev_attr.attr,
312 &sensor_dev_attr_in13_input.dev_attr.attr,
313
314 &sensor_dev_attr_in0_highest.dev_attr.attr,
315 &sensor_dev_attr_in1_highest.dev_attr.attr,
316 &sensor_dev_attr_in2_highest.dev_attr.attr,
317 &sensor_dev_attr_in3_highest.dev_attr.attr,
318 &sensor_dev_attr_in4_highest.dev_attr.attr,
319 &sensor_dev_attr_in5_highest.dev_attr.attr,
320 &sensor_dev_attr_in6_highest.dev_attr.attr,
321 &sensor_dev_attr_in7_highest.dev_attr.attr,
322 &sensor_dev_attr_in8_highest.dev_attr.attr,
323 &sensor_dev_attr_in9_highest.dev_attr.attr,
324 &sensor_dev_attr_in10_highest.dev_attr.attr,
325 &sensor_dev_attr_in11_highest.dev_attr.attr,
326 &sensor_dev_attr_in12_highest.dev_attr.attr,
327 &sensor_dev_attr_in13_highest.dev_attr.attr,
328
329 &sensor_dev_attr_in0_label.dev_attr.attr,
330 &sensor_dev_attr_in1_label.dev_attr.attr,
331 &sensor_dev_attr_in2_label.dev_attr.attr,
332 &sensor_dev_attr_in3_label.dev_attr.attr,
333 &sensor_dev_attr_in4_label.dev_attr.attr,
334 &sensor_dev_attr_in5_label.dev_attr.attr,
335 &sensor_dev_attr_in6_label.dev_attr.attr,
336 &sensor_dev_attr_in7_label.dev_attr.attr,
337 &sensor_dev_attr_in8_label.dev_attr.attr,
338 &sensor_dev_attr_in9_label.dev_attr.attr,
339 &sensor_dev_attr_in10_label.dev_attr.attr,
340 &sensor_dev_attr_in11_label.dev_attr.attr,
341 &sensor_dev_attr_in12_label.dev_attr.attr,
342 &sensor_dev_attr_in13_label.dev_attr.attr,
343
344 NULL
345};
346
347ATTRIBUTE_GROUPS(powr1220);
348
349static int powr1220_probe(struct i2c_client *client,
350 const struct i2c_device_id *id)
351{
352 struct powr1220_data *data;
353 struct device *hwmon_dev;
354
355 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
356 return -ENODEV;
357
358 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
359 if (!data)
360 return -ENOMEM;
361
362 mutex_init(&data->update_lock);
363 data->client = client;
364
365 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
366 client->name, data, powr1220_groups);
367
368 return PTR_ERR_OR_ZERO(hwmon_dev);
369}
370
371static const struct i2c_device_id powr1220_ids[] = {
372 { "powr1220", 0, },
373 { }
374};
375
376MODULE_DEVICE_TABLE(i2c, powr1220_ids);
377
378static struct i2c_driver powr1220_driver = {
379 .class = I2C_CLASS_HWMON,
380 .driver = {
381 .name = "powr1220",
382 },
383 .probe = powr1220_probe,
384 .id_table = powr1220_ids,
385};
386
387module_i2c_driver(powr1220_driver);
388
389MODULE_AUTHOR("Scott Kanowitz");
390MODULE_DESCRIPTION("POWR1220 driver");
391MODULE_LICENSE("GPL");
392
