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11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-sysfs.h>
18#include <linux/err.h>
19#include <linux/mutex.h>
20#include <linux/delay.h>
21
22#define ADC_STEP_MV 2
23#define ADC_MAX_LOW_MEASUREMENT_MV 2000
24
25enum powr1220_regs {
26 VMON_STATUS0,
27 VMON_STATUS1,
28 VMON_STATUS2,
29 OUTPUT_STATUS0,
30 OUTPUT_STATUS1,
31 OUTPUT_STATUS2,
32 INPUT_STATUS,
33 ADC_VALUE_LOW,
34 ADC_VALUE_HIGH,
35 ADC_MUX,
36 UES_BYTE0,
37 UES_BYTE1,
38 UES_BYTE2,
39 UES_BYTE3,
40 GP_OUTPUT1,
41 GP_OUTPUT2,
42 GP_OUTPUT3,
43 INPUT_VALUE,
44 RESET,
45 TRIM1_TRIM,
46 TRIM2_TRIM,
47 TRIM3_TRIM,
48 TRIM4_TRIM,
49 TRIM5_TRIM,
50 TRIM6_TRIM,
51 TRIM7_TRIM,
52 TRIM8_TRIM,
53 MAX_POWR1220_REGS
54};
55
56enum powr1220_adc_values {
57 VMON1,
58 VMON2,
59 VMON3,
60 VMON4,
61 VMON5,
62 VMON6,
63 VMON7,
64 VMON8,
65 VMON9,
66 VMON10,
67 VMON11,
68 VMON12,
69 VCCA,
70 VCCINP,
71 MAX_POWR1220_ADC_VALUES
72};
73
74struct powr1220_data {
75 struct i2c_client *client;
76 struct mutex update_lock;
77 bool adc_valid[MAX_POWR1220_ADC_VALUES];
78
79 unsigned long adc_last_updated[MAX_POWR1220_ADC_VALUES];
80
81
82 int adc_maxes[MAX_POWR1220_ADC_VALUES];
83 int adc_values[MAX_POWR1220_ADC_VALUES];
84};
85
86static const char * const input_names[] = {
87 [VMON1] = "vmon1",
88 [VMON2] = "vmon2",
89 [VMON3] = "vmon3",
90 [VMON4] = "vmon4",
91 [VMON5] = "vmon5",
92 [VMON6] = "vmon6",
93 [VMON7] = "vmon7",
94 [VMON8] = "vmon8",
95 [VMON9] = "vmon9",
96 [VMON10] = "vmon10",
97 [VMON11] = "vmon11",
98 [VMON12] = "vmon12",
99 [VCCA] = "vcca",
100 [VCCINP] = "vccinp",
101};
102
103
104static int powr1220_read_adc(struct device *dev, int ch_num)
105{
106 struct powr1220_data *data = dev_get_drvdata(dev);
107 int reading;
108 int result;
109 int adc_range = 0;
110
111 mutex_lock(&data->update_lock);
112
113 if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||
114 !data->adc_valid[ch_num]) {
115
116
117
118
119
120
121 if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||
122 data->adc_maxes[ch_num] == 0)
123 adc_range = 1 << 4;
124
125
126 result = i2c_smbus_write_byte_data(data->client, ADC_MUX,
127 adc_range | ch_num);
128 if (result)
129 goto exit;
130
131
132
133
134
135 udelay(200);
136
137
138 result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);
139 if (result < 0)
140 goto exit;
141
142 reading = result >> 4;
143
144
145 result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);
146 if (result < 0)
147 goto exit;
148
149 reading |= result << 4;
150
151
152 reading *= ADC_STEP_MV;
153 data->adc_values[ch_num] = reading;
154 data->adc_valid[ch_num] = true;
155 data->adc_last_updated[ch_num] = jiffies;
156 result = reading;
157
158 if (reading > data->adc_maxes[ch_num])
159 data->adc_maxes[ch_num] = reading;
160 } else {
161 result = data->adc_values[ch_num];
162 }
163
164exit:
165 mutex_unlock(&data->update_lock);
166
167 return result;
168}
169
170
171static ssize_t powr1220_voltage_show(struct device *dev,
172 struct device_attribute *dev_attr,
173 char *buf)
174{
175 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
176 int adc_val = powr1220_read_adc(dev, attr->index);
177
178 if (adc_val < 0)
179 return adc_val;
180
181 return sprintf(buf, "%d\n", adc_val);
182}
183
184
185static ssize_t powr1220_max_show(struct device *dev,
186 struct device_attribute *dev_attr, char *buf)
187{
188 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
189 struct powr1220_data *data = dev_get_drvdata(dev);
190
191 return sprintf(buf, "%d\n", data->adc_maxes[attr->index]);
192}
193
194
195static ssize_t powr1220_label_show(struct device *dev,
196 struct device_attribute *dev_attr,
197 char *buf)
198{
199 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
200
201 return sprintf(buf, "%s\n", input_names[attr->index]);
202}
203
204static SENSOR_DEVICE_ATTR_RO(in0_input, powr1220_voltage, VMON1);
205static SENSOR_DEVICE_ATTR_RO(in1_input, powr1220_voltage, VMON2);
206static SENSOR_DEVICE_ATTR_RO(in2_input, powr1220_voltage, VMON3);
207static SENSOR_DEVICE_ATTR_RO(in3_input, powr1220_voltage, VMON4);
208static SENSOR_DEVICE_ATTR_RO(in4_input, powr1220_voltage, VMON5);
209static SENSOR_DEVICE_ATTR_RO(in5_input, powr1220_voltage, VMON6);
210static SENSOR_DEVICE_ATTR_RO(in6_input, powr1220_voltage, VMON7);
211static SENSOR_DEVICE_ATTR_RO(in7_input, powr1220_voltage, VMON8);
212static SENSOR_DEVICE_ATTR_RO(in8_input, powr1220_voltage, VMON9);
213static SENSOR_DEVICE_ATTR_RO(in9_input, powr1220_voltage, VMON10);
214static SENSOR_DEVICE_ATTR_RO(in10_input, powr1220_voltage, VMON11);
215static SENSOR_DEVICE_ATTR_RO(in11_input, powr1220_voltage, VMON12);
216static SENSOR_DEVICE_ATTR_RO(in12_input, powr1220_voltage, VCCA);
217static SENSOR_DEVICE_ATTR_RO(in13_input, powr1220_voltage, VCCINP);
218
219static SENSOR_DEVICE_ATTR_RO(in0_highest, powr1220_max, VMON1);
220static SENSOR_DEVICE_ATTR_RO(in1_highest, powr1220_max, VMON2);
221static SENSOR_DEVICE_ATTR_RO(in2_highest, powr1220_max, VMON3);
222static SENSOR_DEVICE_ATTR_RO(in3_highest, powr1220_max, VMON4);
223static SENSOR_DEVICE_ATTR_RO(in4_highest, powr1220_max, VMON5);
224static SENSOR_DEVICE_ATTR_RO(in5_highest, powr1220_max, VMON6);
225static SENSOR_DEVICE_ATTR_RO(in6_highest, powr1220_max, VMON7);
226static SENSOR_DEVICE_ATTR_RO(in7_highest, powr1220_max, VMON8);
227static SENSOR_DEVICE_ATTR_RO(in8_highest, powr1220_max, VMON9);
228static SENSOR_DEVICE_ATTR_RO(in9_highest, powr1220_max, VMON10);
229static SENSOR_DEVICE_ATTR_RO(in10_highest, powr1220_max, VMON11);
230static SENSOR_DEVICE_ATTR_RO(in11_highest, powr1220_max, VMON12);
231static SENSOR_DEVICE_ATTR_RO(in12_highest, powr1220_max, VCCA);
232static SENSOR_DEVICE_ATTR_RO(in13_highest, powr1220_max, VCCINP);
233
234static SENSOR_DEVICE_ATTR_RO(in0_label, powr1220_label, VMON1);
235static SENSOR_DEVICE_ATTR_RO(in1_label, powr1220_label, VMON2);
236static SENSOR_DEVICE_ATTR_RO(in2_label, powr1220_label, VMON3);
237static SENSOR_DEVICE_ATTR_RO(in3_label, powr1220_label, VMON4);
238static SENSOR_DEVICE_ATTR_RO(in4_label, powr1220_label, VMON5);
239static SENSOR_DEVICE_ATTR_RO(in5_label, powr1220_label, VMON6);
240static SENSOR_DEVICE_ATTR_RO(in6_label, powr1220_label, VMON7);
241static SENSOR_DEVICE_ATTR_RO(in7_label, powr1220_label, VMON8);
242static SENSOR_DEVICE_ATTR_RO(in8_label, powr1220_label, VMON9);
243static SENSOR_DEVICE_ATTR_RO(in9_label, powr1220_label, VMON10);
244static SENSOR_DEVICE_ATTR_RO(in10_label, powr1220_label, VMON11);
245static SENSOR_DEVICE_ATTR_RO(in11_label, powr1220_label, VMON12);
246static SENSOR_DEVICE_ATTR_RO(in12_label, powr1220_label, VCCA);
247static SENSOR_DEVICE_ATTR_RO(in13_label, powr1220_label, VCCINP);
248
249static struct attribute *powr1220_attrs[] = {
250 &sensor_dev_attr_in0_input.dev_attr.attr,
251 &sensor_dev_attr_in1_input.dev_attr.attr,
252 &sensor_dev_attr_in2_input.dev_attr.attr,
253 &sensor_dev_attr_in3_input.dev_attr.attr,
254 &sensor_dev_attr_in4_input.dev_attr.attr,
255 &sensor_dev_attr_in5_input.dev_attr.attr,
256 &sensor_dev_attr_in6_input.dev_attr.attr,
257 &sensor_dev_attr_in7_input.dev_attr.attr,
258 &sensor_dev_attr_in8_input.dev_attr.attr,
259 &sensor_dev_attr_in9_input.dev_attr.attr,
260 &sensor_dev_attr_in10_input.dev_attr.attr,
261 &sensor_dev_attr_in11_input.dev_attr.attr,
262 &sensor_dev_attr_in12_input.dev_attr.attr,
263 &sensor_dev_attr_in13_input.dev_attr.attr,
264
265 &sensor_dev_attr_in0_highest.dev_attr.attr,
266 &sensor_dev_attr_in1_highest.dev_attr.attr,
267 &sensor_dev_attr_in2_highest.dev_attr.attr,
268 &sensor_dev_attr_in3_highest.dev_attr.attr,
269 &sensor_dev_attr_in4_highest.dev_attr.attr,
270 &sensor_dev_attr_in5_highest.dev_attr.attr,
271 &sensor_dev_attr_in6_highest.dev_attr.attr,
272 &sensor_dev_attr_in7_highest.dev_attr.attr,
273 &sensor_dev_attr_in8_highest.dev_attr.attr,
274 &sensor_dev_attr_in9_highest.dev_attr.attr,
275 &sensor_dev_attr_in10_highest.dev_attr.attr,
276 &sensor_dev_attr_in11_highest.dev_attr.attr,
277 &sensor_dev_attr_in12_highest.dev_attr.attr,
278 &sensor_dev_attr_in13_highest.dev_attr.attr,
279
280 &sensor_dev_attr_in0_label.dev_attr.attr,
281 &sensor_dev_attr_in1_label.dev_attr.attr,
282 &sensor_dev_attr_in2_label.dev_attr.attr,
283 &sensor_dev_attr_in3_label.dev_attr.attr,
284 &sensor_dev_attr_in4_label.dev_attr.attr,
285 &sensor_dev_attr_in5_label.dev_attr.attr,
286 &sensor_dev_attr_in6_label.dev_attr.attr,
287 &sensor_dev_attr_in7_label.dev_attr.attr,
288 &sensor_dev_attr_in8_label.dev_attr.attr,
289 &sensor_dev_attr_in9_label.dev_attr.attr,
290 &sensor_dev_attr_in10_label.dev_attr.attr,
291 &sensor_dev_attr_in11_label.dev_attr.attr,
292 &sensor_dev_attr_in12_label.dev_attr.attr,
293 &sensor_dev_attr_in13_label.dev_attr.attr,
294
295 NULL
296};
297
298ATTRIBUTE_GROUPS(powr1220);
299
300static int powr1220_probe(struct i2c_client *client,
301 const struct i2c_device_id *id)
302{
303 struct powr1220_data *data;
304 struct device *hwmon_dev;
305
306 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
307 return -ENODEV;
308
309 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
310 if (!data)
311 return -ENOMEM;
312
313 mutex_init(&data->update_lock);
314 data->client = client;
315
316 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
317 client->name, data, powr1220_groups);
318
319 return PTR_ERR_OR_ZERO(hwmon_dev);
320}
321
322static const struct i2c_device_id powr1220_ids[] = {
323 { "powr1220", 0, },
324 { }
325};
326
327MODULE_DEVICE_TABLE(i2c, powr1220_ids);
328
329static struct i2c_driver powr1220_driver = {
330 .class = I2C_CLASS_HWMON,
331 .driver = {
332 .name = "powr1220",
333 },
334 .probe = powr1220_probe,
335 .id_table = powr1220_ids,
336};
337
338module_i2c_driver(powr1220_driver);
339
340MODULE_AUTHOR("Scott Kanowitz");
341MODULE_DESCRIPTION("POWR1220 driver");
342MODULE_LICENSE("GPL");
343
