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Linux/drivers/hwmon/da9055-hwmon.c

  1 /*
  2  * HWMON Driver for Dialog DA9055
  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/delay.h>
 16 #include <linux/err.h>
 17 #include <linux/hwmon.h>
 18 #include <linux/hwmon-sysfs.h>
 19 #include <linux/init.h>
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/completion.h>
 24 
 25 #include <linux/mfd/da9055/core.h>
 26 #include <linux/mfd/da9055/reg.h>
 27 
 28 #define DA9055_ADCIN_DIV        102
 29 #define DA9055_VSYS_DIV 85
 30 
 31 #define DA9055_ADC_VSYS 0
 32 #define DA9055_ADC_ADCIN1       1
 33 #define DA9055_ADC_ADCIN2       2
 34 #define DA9055_ADC_ADCIN3       3
 35 #define DA9055_ADC_TJUNC        4
 36 
 37 struct da9055_hwmon {
 38         struct da9055   *da9055;
 39         struct mutex    hwmon_lock;
 40         struct mutex    irq_lock;
 41         struct completion done;
 42 };
 43 
 44 static const char * const input_names[] = {
 45         [DA9055_ADC_VSYS]       = "VSYS",
 46         [DA9055_ADC_ADCIN1]     = "ADC IN1",
 47         [DA9055_ADC_ADCIN2]     = "ADC IN2",
 48         [DA9055_ADC_ADCIN3]     = "ADC IN3",
 49         [DA9055_ADC_TJUNC]      = "CHIP TEMP",
 50 };
 51 
 52 static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
 53         [DA9055_ADC_VSYS]       = DA9055_ADC_MUX_VSYS,
 54         [DA9055_ADC_ADCIN1]     = DA9055_ADC_MUX_ADCIN1,
 55         [DA9055_ADC_ADCIN2]     = DA9055_ADC_MUX_ADCIN2,
 56         [DA9055_ADC_ADCIN3]     = DA9055_ADC_MUX_ADCIN3,
 57         [DA9055_ADC_TJUNC]      = DA9055_ADC_MUX_T_SENSE,
 58 };
 59 
 60 static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
 61                                         unsigned char channel)
 62 {
 63         int ret;
 64         unsigned short calc_data;
 65         unsigned short data;
 66         unsigned char mux_sel;
 67         struct da9055 *da9055 = hwmon->da9055;
 68 
 69         if (channel > DA9055_ADC_TJUNC)
 70                 return -EINVAL;
 71 
 72         mutex_lock(&hwmon->irq_lock);
 73 
 74         /* Selects desired MUX for manual conversion */
 75         mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
 76 
 77         ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
 78         if (ret < 0)
 79                 goto err;
 80 
 81         /* Wait for an interrupt */
 82         if (!wait_for_completion_timeout(&hwmon->done,
 83                                         msecs_to_jiffies(500))) {
 84                 dev_err(da9055->dev,
 85                         "timeout waiting for ADC conversion interrupt\n");
 86                 ret = -ETIMEDOUT;
 87                 goto err;
 88         }
 89 
 90         ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
 91         if (ret < 0)
 92                 goto err;
 93 
 94         calc_data = (unsigned short)ret;
 95         data = calc_data << 2;
 96 
 97         ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
 98         if (ret < 0)
 99                 goto err;
100 
101         calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
102         data |= calc_data;
103 
104         ret = data;
105 
106 err:
107         mutex_unlock(&hwmon->irq_lock);
108         return ret;
109 }
110 
111 static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
112 {
113         struct da9055_hwmon *hwmon = irq_data;
114 
115         complete(&hwmon->done);
116 
117         return IRQ_HANDLED;
118 }
119 
120 /* Conversion function for VSYS and ADCINx */
121 static inline int volt_reg_to_mv(int value, int channel)
122 {
123         if (channel == DA9055_ADC_VSYS)
124                 return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
125         else
126                 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
127 }
128 
129 static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
130 {
131 
132         return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
133                                 1 << channel);
134 
135 }
136 
137 static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
138 {
139 
140         return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
141 }
142 
143 static ssize_t da9055_read_auto_ch(struct device *dev,
144                                 struct device_attribute *devattr, char *buf)
145 {
146         struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
147         int ret, adc;
148         int channel = to_sensor_dev_attr(devattr)->index;
149 
150         mutex_lock(&hwmon->hwmon_lock);
151 
152         ret = da9055_enable_auto_mode(hwmon->da9055, channel);
153         if (ret < 0)
154                 goto hwmon_err;
155 
156         usleep_range(10000, 10500);
157 
158         adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
159         if (adc < 0) {
160                 ret = adc;
161                 goto hwmon_err_release;
162         }
163 
164         ret = da9055_disable_auto_mode(hwmon->da9055, channel);
165         if (ret < 0)
166                 goto hwmon_err;
167 
168         mutex_unlock(&hwmon->hwmon_lock);
169 
170         return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));
171 
172 hwmon_err_release:
173         da9055_disable_auto_mode(hwmon->da9055, channel);
174 hwmon_err:
175         mutex_unlock(&hwmon->hwmon_lock);
176         return ret;
177 }
178 
179 static ssize_t da9055_read_tjunc(struct device *dev,
180                                  struct device_attribute *devattr, char *buf)
181 {
182         struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
183         int tjunc;
184         int toffset;
185 
186         tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
187         if (tjunc < 0)
188                 return tjunc;
189 
190         toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
191         if (toffset < 0)
192                 return toffset;
193 
194         /*
195          * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
196          * T_OFFSET is a trim value used to improve accuracy of the result
197          */
198         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
199                                                         + 3076332, 10000));
200 }
201 
202 static ssize_t show_label(struct device *dev,
203                           struct device_attribute *devattr, char *buf)
204 {
205         return sprintf(buf, "%s\n",
206                        input_names[to_sensor_dev_attr(devattr)->index]);
207 }
208 
209 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9055_read_auto_ch, NULL,
210                           DA9055_ADC_VSYS);
211 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
212                           DA9055_ADC_VSYS);
213 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL,
214                           DA9055_ADC_ADCIN1);
215 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL,
216                           DA9055_ADC_ADCIN1);
217 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL,
218                           DA9055_ADC_ADCIN2);
219 static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL,
220                           DA9055_ADC_ADCIN2);
221 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL,
222                           DA9055_ADC_ADCIN3);
223 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
224                           DA9055_ADC_ADCIN3);
225 
226 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL,
227                           DA9055_ADC_TJUNC);
228 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
229                           DA9055_ADC_TJUNC);
230 
231 static struct attribute *da9055_attrs[] = {
232         &sensor_dev_attr_in0_input.dev_attr.attr,
233         &sensor_dev_attr_in0_label.dev_attr.attr,
234         &sensor_dev_attr_in1_input.dev_attr.attr,
235         &sensor_dev_attr_in1_label.dev_attr.attr,
236         &sensor_dev_attr_in2_input.dev_attr.attr,
237         &sensor_dev_attr_in2_label.dev_attr.attr,
238         &sensor_dev_attr_in3_input.dev_attr.attr,
239         &sensor_dev_attr_in3_label.dev_attr.attr,
240 
241         &sensor_dev_attr_temp1_input.dev_attr.attr,
242         &sensor_dev_attr_temp1_label.dev_attr.attr,
243         NULL
244 };
245 
246 ATTRIBUTE_GROUPS(da9055);
247 
248 static int da9055_hwmon_probe(struct platform_device *pdev)
249 {
250         struct device *dev = &pdev->dev;
251         struct da9055_hwmon *hwmon;
252         struct device *hwmon_dev;
253         int hwmon_irq, ret;
254 
255         hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);
256         if (!hwmon)
257                 return -ENOMEM;
258 
259         mutex_init(&hwmon->hwmon_lock);
260         mutex_init(&hwmon->irq_lock);
261 
262         init_completion(&hwmon->done);
263         hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
264 
265         hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
266         if (hwmon_irq < 0)
267                 return hwmon_irq;
268 
269         ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
270                                         NULL, da9055_auxadc_irq,
271                                         IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
272                                         "adc-irq", hwmon);
273         if (ret != 0) {
274                 dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
275                         ret);
276                 return ret;
277         }
278 
279         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
280                                                            hwmon,
281                                                            da9055_groups);
282         return PTR_ERR_OR_ZERO(hwmon_dev);
283 }
284 
285 static struct platform_driver da9055_hwmon_driver = {
286         .probe = da9055_hwmon_probe,
287         .driver = {
288                 .name = "da9055-hwmon",
289                 .owner = THIS_MODULE,
290         },
291 };
292 
293 module_platform_driver(da9055_hwmon_driver);
294 
295 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
296 MODULE_DESCRIPTION("DA9055 HWMON driver");
297 MODULE_LICENSE("GPL");
298 MODULE_ALIAS("platform:da9055-hwmon");
299 

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