Merge tag 'for-5.13-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[linux-2.6-microblaze.git] / drivers / hwmon / da9055-hwmon.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * HWMON Driver for Dialog DA9055
4  *
5  * Copyright(c) 2012 Dialog Semiconductor Ltd.
6  *
7  * Author: David Dajun Chen <dchen@diasemi.com>
8  */
9
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/hwmon.h>
13 #include <linux/hwmon-sysfs.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/completion.h>
19
20 #include <linux/mfd/da9055/core.h>
21 #include <linux/mfd/da9055/reg.h>
22
23 #define DA9055_ADCIN_DIV        102
24 #define DA9055_VSYS_DIV 85
25
26 #define DA9055_ADC_VSYS 0
27 #define DA9055_ADC_ADCIN1       1
28 #define DA9055_ADC_ADCIN2       2
29 #define DA9055_ADC_ADCIN3       3
30 #define DA9055_ADC_TJUNC        4
31
32 struct da9055_hwmon {
33         struct da9055   *da9055;
34         struct mutex    hwmon_lock;
35         struct mutex    irq_lock;
36         struct completion done;
37 };
38
39 static const char * const input_names[] = {
40         [DA9055_ADC_VSYS]       = "VSYS",
41         [DA9055_ADC_ADCIN1]     = "ADC IN1",
42         [DA9055_ADC_ADCIN2]     = "ADC IN2",
43         [DA9055_ADC_ADCIN3]     = "ADC IN3",
44         [DA9055_ADC_TJUNC]      = "CHIP TEMP",
45 };
46
47 static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
48         [DA9055_ADC_VSYS]       = DA9055_ADC_MUX_VSYS,
49         [DA9055_ADC_ADCIN1]     = DA9055_ADC_MUX_ADCIN1,
50         [DA9055_ADC_ADCIN2]     = DA9055_ADC_MUX_ADCIN2,
51         [DA9055_ADC_ADCIN3]     = DA9055_ADC_MUX_ADCIN3,
52         [DA9055_ADC_TJUNC]      = DA9055_ADC_MUX_T_SENSE,
53 };
54
55 static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
56                                         unsigned char channel)
57 {
58         int ret;
59         unsigned short calc_data;
60         unsigned short data;
61         unsigned char mux_sel;
62         struct da9055 *da9055 = hwmon->da9055;
63
64         if (channel > DA9055_ADC_TJUNC)
65                 return -EINVAL;
66
67         mutex_lock(&hwmon->irq_lock);
68
69         /* Selects desired MUX for manual conversion */
70         mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
71
72         ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
73         if (ret < 0)
74                 goto err;
75
76         /* Wait for an interrupt */
77         if (!wait_for_completion_timeout(&hwmon->done,
78                                         msecs_to_jiffies(500))) {
79                 dev_err(da9055->dev,
80                         "timeout waiting for ADC conversion interrupt\n");
81                 ret = -ETIMEDOUT;
82                 goto err;
83         }
84
85         ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
86         if (ret < 0)
87                 goto err;
88
89         calc_data = (unsigned short)ret;
90         data = calc_data << 2;
91
92         ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
93         if (ret < 0)
94                 goto err;
95
96         calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
97         data |= calc_data;
98
99         ret = data;
100
101 err:
102         mutex_unlock(&hwmon->irq_lock);
103         return ret;
104 }
105
106 static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
107 {
108         struct da9055_hwmon *hwmon = irq_data;
109
110         complete(&hwmon->done);
111
112         return IRQ_HANDLED;
113 }
114
115 /* Conversion function for VSYS and ADCINx */
116 static inline int volt_reg_to_mv(int value, int channel)
117 {
118         if (channel == DA9055_ADC_VSYS)
119                 return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
120         else
121                 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
122 }
123
124 static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
125 {
126
127         return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
128                                 1 << channel);
129
130 }
131
132 static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
133 {
134
135         return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
136 }
137
138 static ssize_t da9055_auto_ch_show(struct device *dev,
139                                    struct device_attribute *devattr,
140                                    char *buf)
141 {
142         struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
143         int ret, adc;
144         int channel = to_sensor_dev_attr(devattr)->index;
145
146         mutex_lock(&hwmon->hwmon_lock);
147
148         ret = da9055_enable_auto_mode(hwmon->da9055, channel);
149         if (ret < 0)
150                 goto hwmon_err;
151
152         usleep_range(10000, 10500);
153
154         adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
155         if (adc < 0) {
156                 ret = adc;
157                 goto hwmon_err_release;
158         }
159
160         ret = da9055_disable_auto_mode(hwmon->da9055, channel);
161         if (ret < 0)
162                 goto hwmon_err;
163
164         mutex_unlock(&hwmon->hwmon_lock);
165
166         return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));
167
168 hwmon_err_release:
169         da9055_disable_auto_mode(hwmon->da9055, channel);
170 hwmon_err:
171         mutex_unlock(&hwmon->hwmon_lock);
172         return ret;
173 }
174
175 static ssize_t da9055_tjunc_show(struct device *dev,
176                                  struct device_attribute *devattr, char *buf)
177 {
178         struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
179         int tjunc;
180         int toffset;
181
182         tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
183         if (tjunc < 0)
184                 return tjunc;
185
186         toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
187         if (toffset < 0)
188                 return toffset;
189
190         /*
191          * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
192          * T_OFFSET is a trim value used to improve accuracy of the result
193          */
194         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
195                                                         + 3076332, 10000));
196 }
197
198 static ssize_t label_show(struct device *dev,
199                           struct device_attribute *devattr, char *buf)
200 {
201         return sprintf(buf, "%s\n",
202                        input_names[to_sensor_dev_attr(devattr)->index]);
203 }
204
205 static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
206 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
207 static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
208 static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
209 static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
210 static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
211 static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
212 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
213
214 static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
215 static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);
216
217 static struct attribute *da9055_attrs[] = {
218         &sensor_dev_attr_in0_input.dev_attr.attr,
219         &sensor_dev_attr_in0_label.dev_attr.attr,
220         &sensor_dev_attr_in1_input.dev_attr.attr,
221         &sensor_dev_attr_in1_label.dev_attr.attr,
222         &sensor_dev_attr_in2_input.dev_attr.attr,
223         &sensor_dev_attr_in2_label.dev_attr.attr,
224         &sensor_dev_attr_in3_input.dev_attr.attr,
225         &sensor_dev_attr_in3_label.dev_attr.attr,
226
227         &sensor_dev_attr_temp1_input.dev_attr.attr,
228         &sensor_dev_attr_temp1_label.dev_attr.attr,
229         NULL
230 };
231
232 ATTRIBUTE_GROUPS(da9055);
233
234 static int da9055_hwmon_probe(struct platform_device *pdev)
235 {
236         struct device *dev = &pdev->dev;
237         struct da9055_hwmon *hwmon;
238         struct device *hwmon_dev;
239         int hwmon_irq, ret;
240
241         hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);
242         if (!hwmon)
243                 return -ENOMEM;
244
245         mutex_init(&hwmon->hwmon_lock);
246         mutex_init(&hwmon->irq_lock);
247
248         init_completion(&hwmon->done);
249         hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
250
251         hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
252         if (hwmon_irq < 0)
253                 return hwmon_irq;
254
255         ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
256                                         NULL, da9055_auxadc_irq,
257                                         IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
258                                         "adc-irq", hwmon);
259         if (ret != 0) {
260                 dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
261                         ret);
262                 return ret;
263         }
264
265         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
266                                                            hwmon,
267                                                            da9055_groups);
268         return PTR_ERR_OR_ZERO(hwmon_dev);
269 }
270
271 static struct platform_driver da9055_hwmon_driver = {
272         .probe = da9055_hwmon_probe,
273         .driver = {
274                 .name = "da9055-hwmon",
275         },
276 };
277
278 module_platform_driver(da9055_hwmon_driver);
279
280 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
281 MODULE_DESCRIPTION("DA9055 HWMON driver");
282 MODULE_LICENSE("GPL");
283 MODULE_ALIAS("platform:da9055-hwmon");