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Linux/drivers/hwmon/da9052-hwmon.c

  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 
 27 struct da9052_hwmon {
 28         struct da9052   *da9052;
 29         struct mutex    hwmon_lock;
 30 };
 31 
 32 static const char * const input_names[] = {
 33         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
 34         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
 35         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
 36         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
 37         [DA9052_ADC_IN4]        =       "ADC IN4",
 38         [DA9052_ADC_IN5]        =       "ADC IN5",
 39         [DA9052_ADC_IN6]        =       "ADC IN6",
 40         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
 41         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
 42 };
 43 
 44 /* Conversion function for VDDOUT and VBAT */
 45 static inline int volt_reg_to_mv(int value)
 46 {
 47         return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
 48 }
 49 
 50 /* Conversion function for ADC channels 4, 5 and 6 */
 51 static inline int input_reg_to_mv(int value)
 52 {
 53         return DIV_ROUND_CLOSEST(value * 2500, 1023);
 54 }
 55 
 56 /* Conversion function for VBBAT */
 57 static inline int vbbat_reg_to_mv(int value)
 58 {
 59         return DIV_ROUND_CLOSEST(value * 5000, 1023);
 60 }
 61 
 62 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
 63 {
 64         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
 65                                  DA9052_ADCCONT_AUTOVDDEN,
 66                                  DA9052_ADCCONT_AUTOVDDEN);
 67 }
 68 
 69 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
 70 {
 71         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
 72                                  DA9052_ADCCONT_AUTOVDDEN, 0);
 73 }
 74 
 75 static ssize_t da9052_read_vddout(struct device *dev,
 76                                   struct device_attribute *devattr, char *buf)
 77 {
 78         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 79         int ret, vdd;
 80 
 81         mutex_lock(&hwmon->hwmon_lock);
 82 
 83         ret = da9052_enable_vddout_channel(hwmon->da9052);
 84         if (ret < 0)
 85                 goto hwmon_err;
 86 
 87         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
 88         if (vdd < 0) {
 89                 ret = vdd;
 90                 goto hwmon_err_release;
 91         }
 92 
 93         ret = da9052_disable_vddout_channel(hwmon->da9052);
 94         if (ret < 0)
 95                 goto hwmon_err;
 96 
 97         mutex_unlock(&hwmon->hwmon_lock);
 98         return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
 99 
100 hwmon_err_release:
101         da9052_disable_vddout_channel(hwmon->da9052);
102 hwmon_err:
103         mutex_unlock(&hwmon->hwmon_lock);
104         return ret;
105 }
106 
107 static ssize_t da9052_read_ich(struct device *dev,
108                                struct device_attribute *devattr, char *buf)
109 {
110         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
111         int ret;
112 
113         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
114         if (ret < 0)
115                 return ret;
116 
117         /* Equivalent to 3.9mA/bit in register ICHG_AV */
118         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
119 }
120 
121 static ssize_t da9052_read_tbat(struct device *dev,
122                                 struct device_attribute *devattr, char *buf)
123 {
124         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
125 
126         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
127 }
128 
129 static ssize_t da9052_read_vbat(struct device *dev,
130                                 struct device_attribute *devattr, char *buf)
131 {
132         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
133         int ret;
134 
135         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
136         if (ret < 0)
137                 return ret;
138 
139         return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
140 }
141 
142 static ssize_t da9052_read_misc_channel(struct device *dev,
143                                         struct device_attribute *devattr,
144                                         char *buf)
145 {
146         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
147         int channel = to_sensor_dev_attr(devattr)->index;
148         int ret;
149 
150         ret = da9052_adc_manual_read(hwmon->da9052, channel);
151         if (ret < 0)
152                 return ret;
153 
154         return sprintf(buf, "%d\n", input_reg_to_mv(ret));
155 }
156 
157 static ssize_t da9052_read_tjunc(struct device *dev,
158                                  struct device_attribute *devattr, char *buf)
159 {
160         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
161         int tjunc;
162         int toffset;
163 
164         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
165         if (tjunc < 0)
166                 return tjunc;
167 
168         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
169         if (toffset < 0)
170                 return toffset;
171 
172         /*
173          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
174          * T_OFFSET is a trim value used to improve accuracy of the result
175          */
176         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
177 }
178 
179 static ssize_t da9052_read_vbbat(struct device *dev,
180                                  struct device_attribute *devattr, char *buf)
181 {
182         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
183         int ret;
184 
185         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
186         if (ret < 0)
187                 return ret;
188 
189         return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
190 }
191 
192 static ssize_t show_label(struct device *dev,
193                           struct device_attribute *devattr, char *buf)
194 {
195         return sprintf(buf, "%s\n",
196                        input_names[to_sensor_dev_attr(devattr)->index]);
197 }
198 
199 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
200                           DA9052_ADC_VDDOUT);
201 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
202                           DA9052_ADC_VDDOUT);
203 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
204                           DA9052_ADC_VBAT);
205 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
206                           DA9052_ADC_VBAT);
207 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
208                           DA9052_ADC_IN4);
209 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
210                           DA9052_ADC_IN4);
211 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
212                           DA9052_ADC_IN5);
213 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
214                           DA9052_ADC_IN5);
215 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
216                           DA9052_ADC_IN6);
217 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
218                           DA9052_ADC_IN6);
219 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
220                           DA9052_ADC_VBBAT);
221 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
222                           DA9052_ADC_VBBAT);
223 
224 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
225                           DA9052_ADC_ICH);
226 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
227                           DA9052_ADC_ICH);
228 
229 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
230                           DA9052_ADC_TBAT);
231 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
232                           DA9052_ADC_TBAT);
233 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
234                           DA9052_ADC_TJUNC);
235 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
236                           DA9052_ADC_TJUNC);
237 
238 static struct attribute *da9052_attrs[] = {
239         &sensor_dev_attr_in0_input.dev_attr.attr,
240         &sensor_dev_attr_in0_label.dev_attr.attr,
241         &sensor_dev_attr_in3_input.dev_attr.attr,
242         &sensor_dev_attr_in3_label.dev_attr.attr,
243         &sensor_dev_attr_in4_input.dev_attr.attr,
244         &sensor_dev_attr_in4_label.dev_attr.attr,
245         &sensor_dev_attr_in5_input.dev_attr.attr,
246         &sensor_dev_attr_in5_label.dev_attr.attr,
247         &sensor_dev_attr_in6_input.dev_attr.attr,
248         &sensor_dev_attr_in6_label.dev_attr.attr,
249         &sensor_dev_attr_in9_input.dev_attr.attr,
250         &sensor_dev_attr_in9_label.dev_attr.attr,
251         &sensor_dev_attr_curr1_input.dev_attr.attr,
252         &sensor_dev_attr_curr1_label.dev_attr.attr,
253         &sensor_dev_attr_temp2_input.dev_attr.attr,
254         &sensor_dev_attr_temp2_label.dev_attr.attr,
255         &sensor_dev_attr_temp8_input.dev_attr.attr,
256         &sensor_dev_attr_temp8_label.dev_attr.attr,
257         NULL
258 };
259 
260 ATTRIBUTE_GROUPS(da9052);
261 
262 static int da9052_hwmon_probe(struct platform_device *pdev)
263 {
264         struct device *dev = &pdev->dev;
265         struct da9052_hwmon *hwmon;
266         struct device *hwmon_dev;
267 
268         hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
269         if (!hwmon)
270                 return -ENOMEM;
271 
272         mutex_init(&hwmon->hwmon_lock);
273         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
274 
275         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
276                                                            hwmon,
277                                                            da9052_groups);
278         return PTR_ERR_OR_ZERO(hwmon_dev);
279 }
280 
281 static struct platform_driver da9052_hwmon_driver = {
282         .probe = da9052_hwmon_probe,
283         .driver = {
284                 .name = "da9052-hwmon",
285                 .owner = THIS_MODULE,
286         },
287 };
288 
289 module_platform_driver(da9052_hwmon_driver);
290 
291 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
292 MODULE_DESCRIPTION("DA9052 HWMON driver");
293 MODULE_LICENSE("GPL");
294 MODULE_ALIAS("platform:da9052-hwmon");
295 

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