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1/*
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
15#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 * 2000, 1023) + 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 * 5000, 1023);
61}
62
63static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
64{
65 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
66 DA9052_ADCCONT_AUTOVDDEN,
67 DA9052_ADCCONT_AUTOVDDEN);
68}
69
70static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
71{
72 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
73 DA9052_ADCCONT_AUTOVDDEN, 0);
74}
75
76static ssize_t da9052_read_vddout(struct device *dev,
77 struct device_attribute *devattr, char *buf)
78{
79 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
80 int ret, vdd;
81
82 mutex_lock(&hwmon->hwmon_lock);
83
84 ret = da9052_enable_vddout_channel(hwmon->da9052);
85 if (ret < 0)
86 goto hwmon_err;
87
88 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
89 if (vdd < 0) {
90 ret = vdd;
91 goto hwmon_err_release;
92 }
93
94 ret = da9052_disable_vddout_channel(hwmon->da9052);
95 if (ret < 0)
96 goto hwmon_err;
97
98 mutex_unlock(&hwmon->hwmon_lock);
99 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
100
101hwmon_err_release:
102 da9052_disable_vddout_channel(hwmon->da9052);
103hwmon_err:
104 mutex_unlock(&hwmon->hwmon_lock);
105 return ret;
106}
107
108static ssize_t da9052_read_ich(struct device *dev,
109 struct device_attribute *devattr, char *buf)
110{
111 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
112 int ret;
113
114 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
115 if (ret < 0)
116 return ret;
117
118 /* Equivalent to 3.9mA/bit in register ICHG_AV */
119 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
120}
121
122static ssize_t da9052_read_tbat(struct device *dev,
123 struct device_attribute *devattr, char *buf)
124{
125 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
126
127 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
128}
129
130static ssize_t da9052_read_vbat(struct device *dev,
131 struct device_attribute *devattr, char *buf)
132{
133 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
134 int ret;
135
136 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
137 if (ret < 0)
138 return ret;
139
140 return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
141}
142
143static ssize_t da9052_read_misc_channel(struct device *dev,
144 struct device_attribute *devattr,
145 char *buf)
146{
147 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
148 int channel = to_sensor_dev_attr(devattr)->index;
149 int ret;
150
151 ret = da9052_adc_manual_read(hwmon->da9052, channel);
152 if (ret < 0)
153 return ret;
154
155 return sprintf(buf, "%d\n", input_reg_to_mv(ret));
156}
157
158static ssize_t da9052_read_tjunc(struct device *dev,
159 struct device_attribute *devattr, char *buf)
160{
161 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
162 int tjunc;
163 int toffset;
164
165 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
166 if (tjunc < 0)
167 return tjunc;
168
169 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
170 if (toffset < 0)
171 return toffset;
172
173 /*
174 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
175 * T_OFFSET is a trim value used to improve accuracy of the result
176 */
177 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
178}
179
180static ssize_t da9052_read_vbbat(struct device *dev,
181 struct device_attribute *devattr, char *buf)
182{
183 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
184 int ret;
185
186 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
187 if (ret < 0)
188 return ret;
189
190 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
191}
192
193static ssize_t da9052_hwmon_show_name(struct device *dev,
194 struct device_attribute *devattr,
195 char *buf)
196{
197 return sprintf(buf, "da9052-hwmon\n");
198}
199
200static ssize_t show_label(struct device *dev,
201 struct device_attribute *devattr, char *buf)
202{
203 return sprintf(buf, "%s\n",
204 input_names[to_sensor_dev_attr(devattr)->index]);
205}
206
207static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
208 DA9052_ADC_VDDOUT);
209static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
210 DA9052_ADC_VDDOUT);
211static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
212 DA9052_ADC_VBAT);
213static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
214 DA9052_ADC_VBAT);
215static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
216 DA9052_ADC_IN4);
217static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
218 DA9052_ADC_IN4);
219static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
220 DA9052_ADC_IN5);
221static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
222 DA9052_ADC_IN5);
223static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
224 DA9052_ADC_IN6);
225static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
226 DA9052_ADC_IN6);
227static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
228 DA9052_ADC_VBBAT);
229static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
230 DA9052_ADC_VBBAT);
231
232static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
233 DA9052_ADC_ICH);
234static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
235 DA9052_ADC_ICH);
236
237static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
238 DA9052_ADC_TBAT);
239static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
240 DA9052_ADC_TBAT);
241static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
242 DA9052_ADC_TJUNC);
243static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
244 DA9052_ADC_TJUNC);
245
246static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
247
248static struct attribute *da9052_attr[] = {
249 &dev_attr_name.attr,
250 &sensor_dev_attr_in0_input.dev_attr.attr,
251 &sensor_dev_attr_in0_label.dev_attr.attr,
252 &sensor_dev_attr_in3_input.dev_attr.attr,
253 &sensor_dev_attr_in3_label.dev_attr.attr,
254 &sensor_dev_attr_in4_input.dev_attr.attr,
255 &sensor_dev_attr_in4_label.dev_attr.attr,
256 &sensor_dev_attr_in5_input.dev_attr.attr,
257 &sensor_dev_attr_in5_label.dev_attr.attr,
258 &sensor_dev_attr_in6_input.dev_attr.attr,
259 &sensor_dev_attr_in6_label.dev_attr.attr,
260 &sensor_dev_attr_in9_input.dev_attr.attr,
261 &sensor_dev_attr_in9_label.dev_attr.attr,
262 &sensor_dev_attr_curr1_input.dev_attr.attr,
263 &sensor_dev_attr_curr1_label.dev_attr.attr,
264 &sensor_dev_attr_temp2_input.dev_attr.attr,
265 &sensor_dev_attr_temp2_label.dev_attr.attr,
266 &sensor_dev_attr_temp8_input.dev_attr.attr,
267 &sensor_dev_attr_temp8_label.dev_attr.attr,
268 NULL
269};
270
271static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
272
273static int da9052_hwmon_probe(struct platform_device *pdev)
274{
275 struct da9052_hwmon *hwmon;
276 int ret;
277
278 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
279 GFP_KERNEL);
280 if (!hwmon)
281 return -ENOMEM;
282
283 mutex_init(&hwmon->hwmon_lock);
284 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
285
286 platform_set_drvdata(pdev, hwmon);
287
288 ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
289 if (ret)
290 goto err_mem;
291
292 hwmon->class_device = hwmon_device_register(&pdev->dev);
293 if (IS_ERR(hwmon->class_device)) {
294 ret = PTR_ERR(hwmon->class_device);
295 goto err_sysfs;
296 }
297
298 return 0;
299
300err_sysfs:
301 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
302err_mem:
303 return ret;
304}
305
306static int da9052_hwmon_remove(struct platform_device *pdev)
307{
308 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
309
310 hwmon_device_unregister(hwmon->class_device);
311 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
312
313 return 0;
314}
315
316static struct platform_driver da9052_hwmon_driver = {
317 .probe = da9052_hwmon_probe,
318 .remove = da9052_hwmon_remove,
319 .driver = {
320 .name = "da9052-hwmon",
321 .owner = THIS_MODULE,
322 },
323};
324
325module_platform_driver(da9052_hwmon_driver);
326
327MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
328MODULE_DESCRIPTION("DA9052 HWMON driver");
329MODULE_LICENSE("GPL");
330MODULE_ALIAS("platform:da9052-hwmon");