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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 * 1000, 512) + 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 * 2500, 512); |
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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