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Ashish Jangame41f6432012-03-17 15:34:41 +05301/*
2 * HWMON Driver for Dialog DA9052
3 *
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
Ashish Jangame41f6432012-03-17 15:34:41 +053015#include <linux/err.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-sysfs.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/platform_device.h>
23
24#include <linux/mfd/da9052/da9052.h>
25#include <linux/mfd/da9052/reg.h>
26
27struct da9052_hwmon {
28 struct da9052 *da9052;
29 struct device *class_device;
30 struct mutex hwmon_lock;
31};
32
33static const char * const input_names[] = {
34 [DA9052_ADC_VDDOUT] = "VDDOUT",
35 [DA9052_ADC_ICH] = "CHARGING CURRENT",
36 [DA9052_ADC_TBAT] = "BATTERY TEMP",
37 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
38 [DA9052_ADC_IN4] = "ADC IN4",
39 [DA9052_ADC_IN5] = "ADC IN5",
40 [DA9052_ADC_IN6] = "ADC IN6",
41 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
42 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
43};
44
45/* Conversion function for VDDOUT and VBAT */
46static inline int volt_reg_to_mV(int value)
47{
48 return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500;
49}
50
51/* Conversion function for ADC channels 4, 5 and 6 */
52static inline int input_reg_to_mV(int value)
53{
54 return DIV_ROUND_CLOSEST(value * 2500, 1023);
55}
56
57/* Conversion function for VBBAT */
58static inline int vbbat_reg_to_mV(int value)
59{
60 return DIV_ROUND_CLOSEST(value * 2500, 512);
61}
62
63static int da9052_enable_vddout_channel(struct da9052 *da9052)
64{
65 int ret;
66
67 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
68 if (ret < 0)
69 return ret;
70
71 ret |= DA9052_ADCCONT_AUTOVDDEN;
72
73 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
74}
75
76static int da9052_disable_vddout_channel(struct da9052 *da9052)
77{
78 int ret;
79
80 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
81 if (ret < 0)
82 return ret;
83
84 ret &= ~DA9052_ADCCONT_AUTOVDDEN;
85
86 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
87}
88
89static ssize_t da9052_read_vddout(struct device *dev,
90 struct device_attribute *devattr, char *buf)
91{
92 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
93 int ret, vdd;
94
95 mutex_lock(&hwmon->hwmon_lock);
96
97 ret = da9052_enable_vddout_channel(hwmon->da9052);
98 if (ret < 0)
99 goto hwmon_err;
100
101 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
102 if (vdd < 0) {
103 ret = vdd;
104 goto hwmon_err_release;
105 }
106
107 ret = da9052_disable_vddout_channel(hwmon->da9052);
108 if (ret < 0)
109 goto hwmon_err;
110
111 mutex_unlock(&hwmon->hwmon_lock);
112 return sprintf(buf, "%d\n", volt_reg_to_mV(vdd));
113
114hwmon_err_release:
115 da9052_disable_vddout_channel(hwmon->da9052);
116hwmon_err:
117 mutex_unlock(&hwmon->hwmon_lock);
118 return ret;
119}
120
121static ssize_t da9052_read_ich(struct device *dev,
122 struct device_attribute *devattr, char *buf)
123{
124 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
125 int ret;
126
127 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
128 if (ret < 0)
129 return ret;
130
131 /* Equivalent to 3.9mA/bit in register ICHG_AV */
132 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
133}
134
135static ssize_t da9052_read_tbat(struct device *dev,
136 struct device_attribute *devattr, char *buf)
137{
138 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
139
140 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
141}
142
143static ssize_t da9052_read_vbat(struct device *dev,
144 struct device_attribute *devattr, char *buf)
145{
146 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
147 int ret;
148
149 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
150 if (ret < 0)
151 return ret;
152
153 return sprintf(buf, "%d\n", volt_reg_to_mV(ret));
154}
155
156static ssize_t da9052_read_misc_channel(struct device *dev,
157 struct device_attribute *devattr,
158 char *buf)
159{
160 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
161 int channel = to_sensor_dev_attr(devattr)->index;
162 int ret;
163
164 ret = da9052_adc_manual_read(hwmon->da9052, channel);
165 if (ret < 0)
166 return ret;
167
168 return sprintf(buf, "%d\n", input_reg_to_mV(ret));
169}
170
171static ssize_t da9052_read_tjunc(struct device *dev,
172 struct device_attribute *devattr, char *buf)
173{
174 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
175 int tjunc;
176 int toffset;
177
178 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
179 if (tjunc < 0)
180 return tjunc;
181
182 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
183 if (toffset < 0)
184 return toffset;
185
186 /*
187 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
188 * T_OFFSET is a trim value used to improve accuracy of the result
189 */
190 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
191}
192
193static ssize_t da9052_read_vbbat(struct device *dev,
194 struct device_attribute *devattr, char *buf)
195{
196 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
197 int ret;
198
199 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
200 if (ret < 0)
201 return ret;
202
203 return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret));
204}
205
206static ssize_t da9052_hwmon_show_name(struct device *dev,
207 struct device_attribute *devattr,
208 char *buf)
209{
210 return sprintf(buf, "da9052-hwmon\n");
211}
212
213static ssize_t show_label(struct device *dev,
214 struct device_attribute *devattr, char *buf)
215{
216 return sprintf(buf, "%s\n",
217 input_names[to_sensor_dev_attr(devattr)->index]);
218}
219
220static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
221 DA9052_ADC_VDDOUT);
222static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
223 DA9052_ADC_VDDOUT);
224static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
225 DA9052_ADC_VBAT);
226static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
227 DA9052_ADC_VBAT);
228static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
229 DA9052_ADC_IN4);
230static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
231 DA9052_ADC_IN4);
232static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
233 DA9052_ADC_IN5);
234static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
235 DA9052_ADC_IN5);
236static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
237 DA9052_ADC_IN6);
238static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
239 DA9052_ADC_IN6);
240static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
241 DA9052_ADC_VBBAT);
242static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
243 DA9052_ADC_VBBAT);
244
245static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
246 DA9052_ADC_ICH);
247static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
248 DA9052_ADC_ICH);
249
250static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
251 DA9052_ADC_TBAT);
252static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
253 DA9052_ADC_TBAT);
254static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
255 DA9052_ADC_TJUNC);
256static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
257 DA9052_ADC_TJUNC);
258
259static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
260
261static struct attribute *da9052_attr[] = {
262 &dev_attr_name.attr,
263 &sensor_dev_attr_in0_input.dev_attr.attr,
264 &sensor_dev_attr_in0_label.dev_attr.attr,
265 &sensor_dev_attr_in3_input.dev_attr.attr,
266 &sensor_dev_attr_in3_label.dev_attr.attr,
267 &sensor_dev_attr_in4_input.dev_attr.attr,
268 &sensor_dev_attr_in4_label.dev_attr.attr,
269 &sensor_dev_attr_in5_input.dev_attr.attr,
270 &sensor_dev_attr_in5_label.dev_attr.attr,
271 &sensor_dev_attr_in6_input.dev_attr.attr,
272 &sensor_dev_attr_in6_label.dev_attr.attr,
273 &sensor_dev_attr_in9_input.dev_attr.attr,
274 &sensor_dev_attr_in9_label.dev_attr.attr,
275 &sensor_dev_attr_curr1_input.dev_attr.attr,
276 &sensor_dev_attr_curr1_label.dev_attr.attr,
277 &sensor_dev_attr_temp2_input.dev_attr.attr,
278 &sensor_dev_attr_temp2_label.dev_attr.attr,
279 &sensor_dev_attr_temp8_input.dev_attr.attr,
280 &sensor_dev_attr_temp8_label.dev_attr.attr,
281 NULL
282};
283
284static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
285
286static int __devinit da9052_hwmon_probe(struct platform_device *pdev)
287{
288 struct da9052_hwmon *hwmon;
289 int ret;
290
291 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
292 GFP_KERNEL);
293 if (!hwmon)
294 return -ENOMEM;
295
296 mutex_init(&hwmon->hwmon_lock);
297 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
298
299 platform_set_drvdata(pdev, hwmon);
300
301 ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
302 if (ret)
303 goto err_mem;
304
305 hwmon->class_device = hwmon_device_register(&pdev->dev);
306 if (IS_ERR(hwmon->class_device)) {
307 ret = PTR_ERR(hwmon->class_device);
308 goto err_sysfs;
309 }
310
311 return 0;
312
313err_sysfs:
314 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
315err_mem:
316 return ret;
317}
318
319static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
320{
321 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
322
323 hwmon_device_unregister(hwmon->class_device);
324 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
325
326 return 0;
327}
328
329static struct platform_driver da9052_hwmon_driver = {
330 .probe = da9052_hwmon_probe,
331 .remove = __devexit_p(da9052_hwmon_remove),
332 .driver = {
333 .name = "da9052-hwmon",
334 .owner = THIS_MODULE,
335 },
336};
337
338module_platform_driver(da9052_hwmon_driver);
339
340MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
341MODULE_DESCRIPTION("DA9052 HWMON driver");
342MODULE_LICENSE("GPL");
343MODULE_ALIAS("platform:da9052-hwmon");