1
2
3
4
5
6
7
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
32struct da9055_hwmon {
33 struct da9055 *da9055;
34 struct mutex hwmon_lock;
35 struct mutex irq_lock;
36 struct completion done;
37};
38
39static 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
47static 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
55static 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
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
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
101err:
102 mutex_unlock(&hwmon->irq_lock);
103 return ret;
104}
105
106static 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
116static 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
124static 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
132static 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
138static 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
168hwmon_err_release:
169 da9055_disable_auto_mode(hwmon->da9055, channel);
170hwmon_err:
171 mutex_unlock(&hwmon->hwmon_lock);
172 return ret;
173}
174
175static 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
192
193
194 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
195 + 3076332, 10000));
196}
197
198static 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
205static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
206static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
207static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
208static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
209static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
210static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
211static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
212static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
213
214static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
215static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);
216
217static 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
232ATTRIBUTE_GROUPS(da9055);
233
234static 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
271static struct platform_driver da9055_hwmon_driver = {
272 .probe = da9055_hwmon_probe,
273 .driver = {
274 .name = "da9055-hwmon",
275 },
276};
277
278module_platform_driver(da9055_hwmon_driver);
279
280MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
281MODULE_DESCRIPTION("DA9055 HWMON driver");
282MODULE_LICENSE("GPL");
283MODULE_ALIAS("platform:da9055-hwmon");
284
