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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 device   *class_device;
 30         struct mutex    hwmon_lock;
 31 };
 32 
 33 static 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 */
 46 static 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 */
 52 static inline int input_reg_to_mv(int value)
 53 {
 54         return DIV_ROUND_CLOSEST(value * 2500, 1023);
 55 }
 56 
 57 /* Conversion function for VBBAT */
 58 static inline int vbbat_reg_to_mv(int value)
 59 {
 60         return DIV_ROUND_CLOSEST(value * 5000, 1023);
 61 }
 62 
 63 static 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 
 70 static 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 
 76 static 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 
101 hwmon_err_release:
102         da9052_disable_vddout_channel(hwmon->da9052);
103 hwmon_err:
104         mutex_unlock(&hwmon->hwmon_lock);
105         return ret;
106 }
107 
108 static 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 
122 static 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 
130 static 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 
143 static 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 
158 static 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 
180 static 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 
193 static 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 
200 static 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 
207 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
208                           DA9052_ADC_VDDOUT);
209 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
210                           DA9052_ADC_VDDOUT);
211 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
212                           DA9052_ADC_VBAT);
213 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
214                           DA9052_ADC_VBAT);
215 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
216                           DA9052_ADC_IN4);
217 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
218                           DA9052_ADC_IN4);
219 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
220                           DA9052_ADC_IN5);
221 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
222                           DA9052_ADC_IN5);
223 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
224                           DA9052_ADC_IN6);
225 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
226                           DA9052_ADC_IN6);
227 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
228                           DA9052_ADC_VBBAT);
229 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
230                           DA9052_ADC_VBBAT);
231 
232 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
233                           DA9052_ADC_ICH);
234 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
235                           DA9052_ADC_ICH);
236 
237 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
238                           DA9052_ADC_TBAT);
239 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
240                           DA9052_ADC_TBAT);
241 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
242                           DA9052_ADC_TJUNC);
243 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
244                           DA9052_ADC_TJUNC);
245 
246 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
247 
248 static 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 
271 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
272 
273 static 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 
300 err_sysfs:
301         sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
302 err_mem:
303         return ret;
304 }
305 
306 static 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 
316 static 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 
325 module_platform_driver(da9052_hwmon_driver);
326 
327 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
328 MODULE_DESCRIPTION("DA9052 HWMON driver");
329 MODULE_LICENSE("GPL");
330 MODULE_ALIAS("platform:da9052-hwmon");
331 

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