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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; | |
e41f6432 AJ |
29 | struct mutex hwmon_lock; |
30 | }; | |
31 | ||
32 | static const char * const input_names[] = { | |
33 | [DA9052_ADC_VDDOUT] = "VDDOUT", | |
34 | [DA9052_ADC_ICH] = "CHARGING CURRENT", | |
35 | [DA9052_ADC_TBAT] = "BATTERY TEMP", | |
36 | [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", | |
37 | [DA9052_ADC_IN4] = "ADC IN4", | |
38 | [DA9052_ADC_IN5] = "ADC IN5", | |
39 | [DA9052_ADC_IN6] = "ADC IN6", | |
40 | [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", | |
41 | [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", | |
42 | }; | |
43 | ||
44 | /* Conversion function for VDDOUT and VBAT */ | |
088ce2ac | 45 | static inline int volt_reg_to_mv(int value) |
e41f6432 | 46 | { |
c09088d9 | 47 | return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500; |
e41f6432 AJ |
48 | } |
49 | ||
50 | /* Conversion function for ADC channels 4, 5 and 6 */ | |
088ce2ac | 51 | static inline int input_reg_to_mv(int value) |
e41f6432 AJ |
52 | { |
53 | return DIV_ROUND_CLOSEST(value * 2500, 1023); | |
54 | } | |
55 | ||
56 | /* Conversion function for VBBAT */ | |
088ce2ac | 57 | static inline int vbbat_reg_to_mv(int value) |
e41f6432 | 58 | { |
c09088d9 | 59 | return DIV_ROUND_CLOSEST(value * 5000, 1023); |
e41f6432 AJ |
60 | } |
61 | ||
d9b24e37 | 62 | static inline int da9052_enable_vddout_channel(struct da9052 *da9052) |
e41f6432 | 63 | { |
d9b24e37 AL |
64 | return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, |
65 | DA9052_ADCCONT_AUTOVDDEN, | |
66 | DA9052_ADCCONT_AUTOVDDEN); | |
e41f6432 AJ |
67 | } |
68 | ||
d9b24e37 | 69 | static inline int da9052_disable_vddout_channel(struct da9052 *da9052) |
e41f6432 | 70 | { |
d9b24e37 AL |
71 | return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, |
72 | DA9052_ADCCONT_AUTOVDDEN, 0); | |
e41f6432 AJ |
73 | } |
74 | ||
75 | static ssize_t da9052_read_vddout(struct device *dev, | |
76 | struct device_attribute *devattr, char *buf) | |
77 | { | |
78 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
79 | int ret, vdd; | |
80 | ||
81 | mutex_lock(&hwmon->hwmon_lock); | |
82 | ||
83 | ret = da9052_enable_vddout_channel(hwmon->da9052); | |
84 | if (ret < 0) | |
85 | goto hwmon_err; | |
86 | ||
87 | vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); | |
88 | if (vdd < 0) { | |
89 | ret = vdd; | |
90 | goto hwmon_err_release; | |
91 | } | |
92 | ||
93 | ret = da9052_disable_vddout_channel(hwmon->da9052); | |
94 | if (ret < 0) | |
95 | goto hwmon_err; | |
96 | ||
97 | mutex_unlock(&hwmon->hwmon_lock); | |
088ce2ac | 98 | return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); |
e41f6432 AJ |
99 | |
100 | hwmon_err_release: | |
101 | da9052_disable_vddout_channel(hwmon->da9052); | |
102 | hwmon_err: | |
103 | mutex_unlock(&hwmon->hwmon_lock); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | static ssize_t da9052_read_ich(struct device *dev, | |
108 | struct device_attribute *devattr, char *buf) | |
109 | { | |
110 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
111 | int ret; | |
112 | ||
113 | ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); | |
114 | if (ret < 0) | |
115 | return ret; | |
116 | ||
117 | /* Equivalent to 3.9mA/bit in register ICHG_AV */ | |
118 | return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); | |
119 | } | |
120 | ||
121 | static ssize_t da9052_read_tbat(struct device *dev, | |
122 | struct device_attribute *devattr, char *buf) | |
123 | { | |
124 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
125 | ||
126 | return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); | |
127 | } | |
128 | ||
129 | static ssize_t da9052_read_vbat(struct device *dev, | |
130 | struct device_attribute *devattr, char *buf) | |
131 | { | |
132 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
133 | int ret; | |
134 | ||
135 | ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); | |
136 | if (ret < 0) | |
137 | return ret; | |
138 | ||
088ce2ac | 139 | return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); |
e41f6432 AJ |
140 | } |
141 | ||
142 | static ssize_t da9052_read_misc_channel(struct device *dev, | |
143 | struct device_attribute *devattr, | |
144 | char *buf) | |
145 | { | |
146 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
147 | int channel = to_sensor_dev_attr(devattr)->index; | |
148 | int ret; | |
149 | ||
150 | ret = da9052_adc_manual_read(hwmon->da9052, channel); | |
151 | if (ret < 0) | |
152 | return ret; | |
153 | ||
088ce2ac | 154 | return sprintf(buf, "%d\n", input_reg_to_mv(ret)); |
e41f6432 AJ |
155 | } |
156 | ||
157 | static ssize_t da9052_read_tjunc(struct device *dev, | |
158 | struct device_attribute *devattr, char *buf) | |
159 | { | |
160 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
161 | int tjunc; | |
162 | int toffset; | |
163 | ||
164 | tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); | |
165 | if (tjunc < 0) | |
166 | return tjunc; | |
167 | ||
168 | toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); | |
169 | if (toffset < 0) | |
170 | return toffset; | |
171 | ||
172 | /* | |
173 | * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 | |
174 | * T_OFFSET is a trim value used to improve accuracy of the result | |
175 | */ | |
176 | return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); | |
177 | } | |
178 | ||
179 | static ssize_t da9052_read_vbbat(struct device *dev, | |
180 | struct device_attribute *devattr, char *buf) | |
181 | { | |
182 | struct da9052_hwmon *hwmon = dev_get_drvdata(dev); | |
183 | int ret; | |
184 | ||
185 | ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); | |
186 | if (ret < 0) | |
187 | return ret; | |
188 | ||
088ce2ac | 189 | return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); |
e41f6432 AJ |
190 | } |
191 | ||
e41f6432 AJ |
192 | static ssize_t show_label(struct device *dev, |
193 | struct device_attribute *devattr, char *buf) | |
194 | { | |
195 | return sprintf(buf, "%s\n", | |
196 | input_names[to_sensor_dev_attr(devattr)->index]); | |
197 | } | |
198 | ||
199 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, | |
200 | DA9052_ADC_VDDOUT); | |
201 | static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, | |
202 | DA9052_ADC_VDDOUT); | |
203 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, | |
204 | DA9052_ADC_VBAT); | |
205 | static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, | |
206 | DA9052_ADC_VBAT); | |
207 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
208 | DA9052_ADC_IN4); | |
209 | static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, | |
210 | DA9052_ADC_IN4); | |
211 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
212 | DA9052_ADC_IN5); | |
213 | static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, | |
214 | DA9052_ADC_IN5); | |
215 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, | |
216 | DA9052_ADC_IN6); | |
217 | static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, | |
218 | DA9052_ADC_IN6); | |
219 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, | |
220 | DA9052_ADC_VBBAT); | |
221 | static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, | |
222 | DA9052_ADC_VBBAT); | |
223 | ||
224 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, | |
225 | DA9052_ADC_ICH); | |
226 | static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, | |
227 | DA9052_ADC_ICH); | |
228 | ||
229 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, | |
230 | DA9052_ADC_TBAT); | |
231 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, | |
232 | DA9052_ADC_TBAT); | |
233 | static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, | |
234 | DA9052_ADC_TJUNC); | |
235 | static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, | |
236 | DA9052_ADC_TJUNC); | |
237 | ||
4222eb5f | 238 | static struct attribute *da9052_attrs[] = { |
e41f6432 AJ |
239 | &sensor_dev_attr_in0_input.dev_attr.attr, |
240 | &sensor_dev_attr_in0_label.dev_attr.attr, | |
241 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
242 | &sensor_dev_attr_in3_label.dev_attr.attr, | |
243 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
244 | &sensor_dev_attr_in4_label.dev_attr.attr, | |
245 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
246 | &sensor_dev_attr_in5_label.dev_attr.attr, | |
247 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
248 | &sensor_dev_attr_in6_label.dev_attr.attr, | |
249 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
250 | &sensor_dev_attr_in9_label.dev_attr.attr, | |
251 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
252 | &sensor_dev_attr_curr1_label.dev_attr.attr, | |
253 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
254 | &sensor_dev_attr_temp2_label.dev_attr.attr, | |
255 | &sensor_dev_attr_temp8_input.dev_attr.attr, | |
256 | &sensor_dev_attr_temp8_label.dev_attr.attr, | |
257 | NULL | |
258 | }; | |
259 | ||
4222eb5f | 260 | ATTRIBUTE_GROUPS(da9052); |
e41f6432 | 261 | |
6c931ae1 | 262 | static int da9052_hwmon_probe(struct platform_device *pdev) |
e41f6432 | 263 | { |
4222eb5f | 264 | struct device *dev = &pdev->dev; |
e41f6432 | 265 | struct da9052_hwmon *hwmon; |
4222eb5f | 266 | struct device *hwmon_dev; |
e41f6432 | 267 | |
4222eb5f | 268 | hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); |
e41f6432 AJ |
269 | if (!hwmon) |
270 | return -ENOMEM; | |
271 | ||
272 | mutex_init(&hwmon->hwmon_lock); | |
273 | hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); | |
274 | ||
4222eb5f AL |
275 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", |
276 | hwmon, | |
277 | da9052_groups); | |
278 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
e41f6432 AJ |
279 | } |
280 | ||
281 | static struct platform_driver da9052_hwmon_driver = { | |
282 | .probe = da9052_hwmon_probe, | |
e41f6432 AJ |
283 | .driver = { |
284 | .name = "da9052-hwmon", | |
e41f6432 AJ |
285 | }, |
286 | }; | |
287 | ||
288 | module_platform_driver(da9052_hwmon_driver); | |
289 | ||
290 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
291 | MODULE_DESCRIPTION("DA9052 HWMON driver"); | |
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_ALIAS("platform:da9052-hwmon"); |