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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
37struct da9055_hwmon {
38 struct da9055 *da9055;
39 struct mutex hwmon_lock;
40 struct mutex irq_lock;
41 struct completion done;
42};
43
44static 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
52static 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
60static 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
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
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
106err:
107 mutex_unlock(&hwmon->irq_lock);
108 return ret;
109}
110
111static 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
121static 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
129static 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
137static 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
143static 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
172hwmon_err_release:
173 da9055_disable_auto_mode(hwmon->da9055, channel);
174hwmon_err:
175 mutex_unlock(&hwmon->hwmon_lock);
176 return ret;
177}
178
179static 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
196
197
198 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
199 + 3076332, 10000));
200}
201
202static 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
209static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9055_read_auto_ch, NULL,
210 DA9055_ADC_VSYS);
211static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
212 DA9055_ADC_VSYS);
213static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL,
214 DA9055_ADC_ADCIN1);
215static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL,
216 DA9055_ADC_ADCIN1);
217static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL,
218 DA9055_ADC_ADCIN2);
219static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL,
220 DA9055_ADC_ADCIN2);
221static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL,
222 DA9055_ADC_ADCIN3);
223static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
224 DA9055_ADC_ADCIN3);
225
226static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL,
227 DA9055_ADC_TJUNC);
228static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
229 DA9055_ADC_TJUNC);
230
231static 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
246ATTRIBUTE_GROUPS(da9055);
247
248static 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
285static struct platform_driver da9055_hwmon_driver = {
286 .probe = da9055_hwmon_probe,
287 .driver = {
288 .name = "da9055-hwmon",
289 },
290};
291
292module_platform_driver(da9055_hwmon_driver);
293
294MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
295MODULE_DESCRIPTION("DA9055 HWMON driver");
296MODULE_LICENSE("GPL");
297MODULE_ALIAS("platform:da9055-hwmon");
298
