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e41f6432 AJ |
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 | ||
e41f6432 AJ |
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 int da9052_enable_vddout_channel(struct da9052 *da9052) | |
64 | { | |
65 | int ret; | |
66 | ||
67 | ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); | |
68 | if (ret < 0) | |
69 | return ret; | |
70 | ||
71 | ret |= DA9052_ADCCONT_AUTOVDDEN; | |
72 | ||
73 | return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); | |
74 | } | |
75 | ||
76 | static int da9052_disable_vddout_channel(struct da9052 *da9052) | |
77 | { | |
78 | int ret; | |
79 | ||
80 | ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | ||
84 | ret &= ~DA9052_ADCCONT_AUTOVDDEN; | |
85 | ||
86 | return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); | |
87 | } | |
88 | ||
89 | static ssize_t da9052_read_vddout(struct device *dev, | |
90 | struct device_attribute *devattr, char *buf) | |
91 | { | |
92 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
93 | int ret, vdd; | |
94 | ||
95 | mutex_lock(&hwmon->hwmon_lock); | |
96 | ||
97 | ret = da9052_enable_vddout_channel(hwmon->da9052); | |
98 | if (ret < 0) | |
99 | goto hwmon_err; | |
100 | ||
101 | vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); | |
102 | if (vdd < 0) { | |
103 | ret = vdd; | |
104 | goto hwmon_err_release; | |
105 | } | |
106 | ||
107 | ret = da9052_disable_vddout_channel(hwmon->da9052); | |
108 | if (ret < 0) | |
109 | goto hwmon_err; | |
110 | ||
111 | mutex_unlock(&hwmon->hwmon_lock); | |
112 | return sprintf(buf, "%d\n", volt_reg_to_mV(vdd)); | |
113 | ||
114 | hwmon_err_release: | |
115 | da9052_disable_vddout_channel(hwmon->da9052); | |
116 | hwmon_err: | |
117 | mutex_unlock(&hwmon->hwmon_lock); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | static ssize_t da9052_read_ich(struct device *dev, | |
122 | struct device_attribute *devattr, char *buf) | |
123 | { | |
124 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
125 | int ret; | |
126 | ||
127 | ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); | |
128 | if (ret < 0) | |
129 | return ret; | |
130 | ||
131 | /* Equivalent to 3.9mA/bit in register ICHG_AV */ | |
132 | return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); | |
133 | } | |
134 | ||
135 | static ssize_t da9052_read_tbat(struct device *dev, | |
136 | struct device_attribute *devattr, char *buf) | |
137 | { | |
138 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
139 | ||
140 | return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); | |
141 | } | |
142 | ||
143 | static ssize_t da9052_read_vbat(struct device *dev, | |
144 | struct device_attribute *devattr, char *buf) | |
145 | { | |
146 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
147 | int ret; | |
148 | ||
149 | ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); | |
150 | if (ret < 0) | |
151 | return ret; | |
152 | ||
153 | return sprintf(buf, "%d\n", volt_reg_to_mV(ret)); | |
154 | } | |
155 | ||
156 | static ssize_t da9052_read_misc_channel(struct device *dev, | |
157 | struct device_attribute *devattr, | |
158 | char *buf) | |
159 | { | |
160 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
161 | int channel = to_sensor_dev_attr(devattr)->index; | |
162 | int ret; | |
163 | ||
164 | ret = da9052_adc_manual_read(hwmon->da9052, channel); | |
165 | if (ret < 0) | |
166 | return ret; | |
167 | ||
168 | return sprintf(buf, "%d\n", input_reg_to_mV(ret)); | |
169 | } | |
170 | ||
171 | static ssize_t da9052_read_tjunc(struct device *dev, | |
172 | struct device_attribute *devattr, char *buf) | |
173 | { | |
174 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
175 | int tjunc; | |
176 | int toffset; | |
177 | ||
178 | tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); | |
179 | if (tjunc < 0) | |
180 | return tjunc; | |
181 | ||
182 | toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); | |
183 | if (toffset < 0) | |
184 | return toffset; | |
185 | ||
186 | /* | |
187 | * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 | |
188 | * T_OFFSET is a trim value used to improve accuracy of the result | |
189 | */ | |
190 | return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); | |
191 | } | |
192 | ||
193 | static ssize_t da9052_read_vbbat(struct device *dev, | |
194 | struct device_attribute *devattr, char *buf) | |
195 | { | |
196 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
197 | int ret; | |
198 | ||
199 | ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | ||
203 | return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret)); | |
204 | } | |
205 | ||
206 | static ssize_t da9052_hwmon_show_name(struct device *dev, | |
207 | struct device_attribute *devattr, | |
208 | char *buf) | |
209 | { | |
210 | return sprintf(buf, "da9052-hwmon\n"); | |
211 | } | |
212 | ||
213 | static ssize_t show_label(struct device *dev, | |
214 | struct device_attribute *devattr, char *buf) | |
215 | { | |
216 | return sprintf(buf, "%s\n", | |
217 | input_names[to_sensor_dev_attr(devattr)->index]); | |
218 | } | |
219 | ||
220 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, | |
221 | DA9052_ADC_VDDOUT); | |
222 | static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, | |
223 | DA9052_ADC_VDDOUT); | |
224 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, | |
225 | DA9052_ADC_VBAT); | |
226 | static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, | |
227 | DA9052_ADC_VBAT); | |
228 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
229 | DA9052_ADC_IN4); | |
230 | static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, | |
231 | DA9052_ADC_IN4); | |
232 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
233 | DA9052_ADC_IN5); | |
234 | static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, | |
235 | DA9052_ADC_IN5); | |
236 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
237 | DA9052_ADC_IN6); | |
238 | static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, | |
239 | DA9052_ADC_IN6); | |
240 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, | |
241 | DA9052_ADC_VBBAT); | |
242 | static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, | |
243 | DA9052_ADC_VBBAT); | |
244 | ||
245 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, | |
246 | DA9052_ADC_ICH); | |
247 | static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, | |
248 | DA9052_ADC_ICH); | |
249 | ||
250 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, | |
251 | DA9052_ADC_TBAT); | |
252 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, | |
253 | DA9052_ADC_TBAT); | |
254 | static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, | |
255 | DA9052_ADC_TJUNC); | |
256 | static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, | |
257 | DA9052_ADC_TJUNC); | |
258 | ||
259 | static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL); | |
260 | ||
261 | static struct attribute *da9052_attr[] = { | |
262 | &dev_attr_name.attr, | |
263 | &sensor_dev_attr_in0_input.dev_attr.attr, | |
264 | &sensor_dev_attr_in0_label.dev_attr.attr, | |
265 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
266 | &sensor_dev_attr_in3_label.dev_attr.attr, | |
267 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
268 | &sensor_dev_attr_in4_label.dev_attr.attr, | |
269 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
270 | &sensor_dev_attr_in5_label.dev_attr.attr, | |
271 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
272 | &sensor_dev_attr_in6_label.dev_attr.attr, | |
273 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
274 | &sensor_dev_attr_in9_label.dev_attr.attr, | |
275 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
276 | &sensor_dev_attr_curr1_label.dev_attr.attr, | |
277 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
278 | &sensor_dev_attr_temp2_label.dev_attr.attr, | |
279 | &sensor_dev_attr_temp8_input.dev_attr.attr, | |
280 | &sensor_dev_attr_temp8_label.dev_attr.attr, | |
281 | NULL | |
282 | }; | |
283 | ||
284 | static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr}; | |
285 | ||
6c931ae1 | 286 | static int da9052_hwmon_probe(struct platform_device *pdev) |
e41f6432 AJ |
287 | { |
288 | struct da9052_hwmon *hwmon; | |
289 | int ret; | |
290 | ||
291 | hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon), | |
292 | GFP_KERNEL); | |
293 | if (!hwmon) | |
294 | return -ENOMEM; | |
295 | ||
296 | mutex_init(&hwmon->hwmon_lock); | |
297 | hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); | |
298 | ||
299 | platform_set_drvdata(pdev, hwmon); | |
300 | ||
301 | ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group); | |
302 | if (ret) | |
303 | goto err_mem; | |
304 | ||
305 | hwmon->class_device = hwmon_device_register(&pdev->dev); | |
306 | if (IS_ERR(hwmon->class_device)) { | |
307 | ret = PTR_ERR(hwmon->class_device); | |
308 | goto err_sysfs; | |
309 | } | |
310 | ||
311 | return 0; | |
312 | ||
313 | err_sysfs: | |
314 | sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); | |
315 | err_mem: | |
316 | return ret; | |
317 | } | |
318 | ||
281dfd0b | 319 | static int da9052_hwmon_remove(struct platform_device *pdev) |
e41f6432 AJ |
320 | { |
321 | struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); | |
322 | ||
323 | hwmon_device_unregister(hwmon->class_device); | |
324 | sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static struct platform_driver da9052_hwmon_driver = { | |
330 | .probe = da9052_hwmon_probe, | |
9e5e9b7a | 331 | .remove = da9052_hwmon_remove, |
e41f6432 AJ |
332 | .driver = { |
333 | .name = "da9052-hwmon", | |
334 | .owner = THIS_MODULE, | |
335 | }, | |
336 | }; | |
337 | ||
338 | module_platform_driver(da9052_hwmon_driver); | |
339 | ||
340 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
341 | MODULE_DESCRIPTION("DA9052 HWMON driver"); | |
342 | MODULE_LICENSE("GPL"); | |
343 | MODULE_ALIAS("platform:da9052-hwmon"); |