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5c0e09e0 WY |
1 | /* |
2 | * Power supply driver for the Active-semi ACT8945A PMIC | |
3 | * | |
4 | * Copyright (C) 2015 Atmel Corporation | |
5 | * | |
6 | * Author: Wenyou Yang <wenyou.yang@atmel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_gpio.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/power_supply.h> | |
18 | #include <linux/regmap.h> | |
19 | ||
20 | static const char *act8945a_charger_model = "ACT8945A"; | |
21 | static const char *act8945a_charger_manufacturer = "Active-semi"; | |
22 | ||
23 | /** | |
24 | * ACT8945A Charger Register Map | |
25 | */ | |
26 | ||
27 | /* 0x70: Reserved */ | |
28 | #define ACT8945A_APCH_CFG 0x71 | |
29 | #define ACT8945A_APCH_STATUS 0x78 | |
30 | #define ACT8945A_APCH_CTRL 0x79 | |
31 | #define ACT8945A_APCH_STATE 0x7A | |
32 | ||
33 | /* ACT8945A_APCH_CFG */ | |
34 | #define APCH_CFG_OVPSET (0x3 << 0) | |
35 | #define APCH_CFG_OVPSET_6V6 (0x0 << 0) | |
36 | #define APCH_CFG_OVPSET_7V (0x1 << 0) | |
37 | #define APCH_CFG_OVPSET_7V5 (0x2 << 0) | |
38 | #define APCH_CFG_OVPSET_8V (0x3 << 0) | |
39 | #define APCH_CFG_PRETIMO (0x3 << 2) | |
40 | #define APCH_CFG_PRETIMO_40_MIN (0x0 << 2) | |
41 | #define APCH_CFG_PRETIMO_60_MIN (0x1 << 2) | |
42 | #define APCH_CFG_PRETIMO_80_MIN (0x2 << 2) | |
43 | #define APCH_CFG_PRETIMO_DISABLED (0x3 << 2) | |
44 | #define APCH_CFG_TOTTIMO (0x3 << 4) | |
45 | #define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4) | |
46 | #define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4) | |
47 | #define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4) | |
48 | #define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4) | |
49 | #define APCH_CFG_SUSCHG (0x1 << 7) | |
50 | ||
51 | #define APCH_STATUS_CHGDAT BIT(0) | |
52 | #define APCH_STATUS_INDAT BIT(1) | |
53 | #define APCH_STATUS_TEMPDAT BIT(2) | |
54 | #define APCH_STATUS_TIMRDAT BIT(3) | |
55 | #define APCH_STATUS_CHGSTAT BIT(4) | |
56 | #define APCH_STATUS_INSTAT BIT(5) | |
57 | #define APCH_STATUS_TEMPSTAT BIT(6) | |
58 | #define APCH_STATUS_TIMRSTAT BIT(7) | |
59 | ||
60 | #define APCH_CTRL_CHGEOCOUT BIT(0) | |
61 | #define APCH_CTRL_INDIS BIT(1) | |
62 | #define APCH_CTRL_TEMPOUT BIT(2) | |
63 | #define APCH_CTRL_TIMRPRE BIT(3) | |
64 | #define APCH_CTRL_CHGEOCIN BIT(4) | |
65 | #define APCH_CTRL_INCON BIT(5) | |
66 | #define APCH_CTRL_TEMPIN BIT(6) | |
67 | #define APCH_CTRL_TIMRTOT BIT(7) | |
68 | ||
69 | #define APCH_STATE_ACINSTAT (0x1 << 1) | |
70 | #define APCH_STATE_CSTATE (0x3 << 4) | |
71 | #define APCH_STATE_CSTATE_SHIFT 4 | |
72 | #define APCH_STATE_CSTATE_DISABLED 0x00 | |
73 | #define APCH_STATE_CSTATE_EOC 0x01 | |
74 | #define APCH_STATE_CSTATE_FAST 0x02 | |
75 | #define APCH_STATE_CSTATE_PRE 0x03 | |
76 | ||
77 | struct act8945a_charger { | |
78 | struct regmap *regmap; | |
79 | bool battery_temperature; | |
80 | }; | |
81 | ||
82 | static int act8945a_get_charger_state(struct regmap *regmap, int *val) | |
83 | { | |
84 | int ret; | |
85 | unsigned int status, state; | |
86 | ||
87 | ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); | |
88 | if (ret < 0) | |
89 | return ret; | |
90 | ||
91 | ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); | |
92 | if (ret < 0) | |
93 | return ret; | |
94 | ||
95 | state &= APCH_STATE_CSTATE; | |
96 | state >>= APCH_STATE_CSTATE_SHIFT; | |
97 | ||
98 | if (state == APCH_STATE_CSTATE_EOC) { | |
99 | if (status & APCH_STATUS_CHGDAT) | |
100 | *val = POWER_SUPPLY_STATUS_FULL; | |
101 | else | |
102 | *val = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
103 | } else if ((state == APCH_STATE_CSTATE_FAST) || | |
104 | (state == APCH_STATE_CSTATE_PRE)) { | |
105 | *val = POWER_SUPPLY_STATUS_CHARGING; | |
106 | } else { | |
107 | *val = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int act8945a_get_charge_type(struct regmap *regmap, int *val) | |
114 | { | |
115 | int ret; | |
116 | unsigned int state; | |
117 | ||
118 | ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | state &= APCH_STATE_CSTATE; | |
123 | state >>= APCH_STATE_CSTATE_SHIFT; | |
124 | ||
125 | switch (state) { | |
126 | case APCH_STATE_CSTATE_PRE: | |
127 | *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
128 | break; | |
129 | case APCH_STATE_CSTATE_FAST: | |
130 | *val = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
131 | break; | |
132 | case APCH_STATE_CSTATE_EOC: | |
133 | case APCH_STATE_CSTATE_DISABLED: | |
134 | default: | |
135 | *val = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int act8945a_get_battery_health(struct act8945a_charger *charger, | |
142 | struct regmap *regmap, int *val) | |
143 | { | |
144 | int ret; | |
145 | unsigned int status; | |
146 | ||
147 | ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); | |
148 | if (ret < 0) | |
149 | return ret; | |
150 | ||
151 | if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT)) | |
152 | *val = POWER_SUPPLY_HEALTH_OVERHEAT; | |
153 | else if (!(status & APCH_STATUS_INDAT)) | |
154 | *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
155 | else if (status & APCH_STATUS_TIMRDAT) | |
156 | *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
157 | else | |
158 | *val = POWER_SUPPLY_HEALTH_GOOD; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static enum power_supply_property act8945a_charger_props[] = { | |
164 | POWER_SUPPLY_PROP_STATUS, | |
165 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
166 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
167 | POWER_SUPPLY_PROP_HEALTH, | |
168 | POWER_SUPPLY_PROP_MODEL_NAME, | |
169 | POWER_SUPPLY_PROP_MANUFACTURER | |
170 | }; | |
171 | ||
172 | static int act8945a_charger_get_property(struct power_supply *psy, | |
173 | enum power_supply_property prop, | |
174 | union power_supply_propval *val) | |
175 | { | |
176 | struct act8945a_charger *charger = power_supply_get_drvdata(psy); | |
177 | struct regmap *regmap = charger->regmap; | |
178 | int ret = 0; | |
179 | ||
180 | switch (prop) { | |
181 | case POWER_SUPPLY_PROP_STATUS: | |
182 | ret = act8945a_get_charger_state(regmap, &val->intval); | |
183 | break; | |
184 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
185 | ret = act8945a_get_charge_type(regmap, &val->intval); | |
186 | break; | |
187 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
188 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
189 | break; | |
190 | case POWER_SUPPLY_PROP_HEALTH: | |
191 | ret = act8945a_get_battery_health(charger, | |
192 | regmap, &val->intval); | |
193 | break; | |
194 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
195 | val->strval = act8945a_charger_model; | |
196 | break; | |
197 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
198 | val->strval = act8945a_charger_manufacturer; | |
199 | break; | |
200 | default: | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | static const struct power_supply_desc act8945a_charger_desc = { | |
208 | .name = "act8945a-charger", | |
209 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
210 | .get_property = act8945a_charger_get_property, | |
211 | .properties = act8945a_charger_props, | |
212 | .num_properties = ARRAY_SIZE(act8945a_charger_props), | |
213 | }; | |
214 | ||
215 | #define DEFAULT_TOTAL_TIME_OUT 3 | |
216 | #define DEFAULT_PRE_TIME_OUT 40 | |
217 | #define DEFAULT_INPUT_OVP_THRESHOLD 6600 | |
218 | ||
219 | static int act8945a_charger_config(struct device *dev, | |
220 | struct act8945a_charger *charger) | |
221 | { | |
222 | struct device_node *np = dev->of_node; | |
223 | enum of_gpio_flags flags; | |
224 | struct regmap *regmap = charger->regmap; | |
225 | ||
226 | u32 total_time_out; | |
227 | u32 pre_time_out; | |
228 | u32 input_voltage_threshold; | |
229 | int chglev_pin; | |
230 | ||
231 | unsigned int value = 0; | |
232 | ||
233 | if (!np) { | |
234 | dev_err(dev, "no charger of node\n"); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | charger->battery_temperature = of_property_read_bool(np, | |
239 | "active-semi,check-battery-temperature"); | |
240 | ||
241 | chglev_pin = of_get_named_gpio_flags(np, | |
242 | "active-semi,chglev-gpios", 0, &flags); | |
243 | ||
244 | if (gpio_is_valid(chglev_pin)) { | |
245 | gpio_set_value(chglev_pin, | |
246 | ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1)); | |
247 | } | |
248 | ||
249 | if (of_property_read_u32(np, | |
250 | "active-semi,input-voltage-threshold-microvolt", | |
251 | &input_voltage_threshold)) | |
252 | input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD; | |
253 | ||
254 | if (of_property_read_u32(np, | |
255 | "active-semi,precondition-timeout", | |
256 | &pre_time_out)) | |
257 | pre_time_out = DEFAULT_PRE_TIME_OUT; | |
258 | ||
259 | if (of_property_read_u32(np, "active-semi,total-timeout", | |
260 | &total_time_out)) | |
261 | total_time_out = DEFAULT_TOTAL_TIME_OUT; | |
262 | ||
263 | switch (input_voltage_threshold) { | |
264 | case 8000: | |
265 | value |= APCH_CFG_OVPSET_8V; | |
266 | break; | |
267 | case 7500: | |
268 | value |= APCH_CFG_OVPSET_7V5; | |
269 | break; | |
270 | case 7000: | |
271 | value |= APCH_CFG_OVPSET_7V; | |
272 | break; | |
273 | case 6600: | |
274 | default: | |
275 | value |= APCH_CFG_OVPSET_6V6; | |
276 | break; | |
277 | } | |
278 | ||
279 | switch (pre_time_out) { | |
280 | case 60: | |
281 | value |= APCH_CFG_PRETIMO_60_MIN; | |
282 | break; | |
283 | case 80: | |
284 | value |= APCH_CFG_PRETIMO_80_MIN; | |
285 | break; | |
286 | case 0: | |
287 | value |= APCH_CFG_PRETIMO_DISABLED; | |
288 | break; | |
289 | case 40: | |
290 | default: | |
291 | value |= APCH_CFG_PRETIMO_40_MIN; | |
292 | break; | |
293 | } | |
294 | ||
295 | switch (total_time_out) { | |
296 | case 4: | |
297 | value |= APCH_CFG_TOTTIMO_4_HOUR; | |
298 | break; | |
299 | case 5: | |
300 | value |= APCH_CFG_TOTTIMO_5_HOUR; | |
301 | break; | |
302 | case 0: | |
303 | value |= APCH_CFG_TOTTIMO_DISABLED; | |
304 | break; | |
305 | case 3: | |
306 | default: | |
307 | value |= APCH_CFG_TOTTIMO_3_HOUR; | |
308 | break; | |
309 | } | |
310 | ||
311 | return regmap_write(regmap, ACT8945A_APCH_CFG, value); | |
312 | } | |
313 | ||
314 | static int act8945a_charger_probe(struct platform_device *pdev) | |
315 | { | |
316 | struct act8945a_charger *charger; | |
317 | struct power_supply *psy; | |
318 | struct power_supply_config psy_cfg = {}; | |
319 | int ret; | |
320 | ||
321 | charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); | |
322 | if (!charger) | |
323 | return -ENOMEM; | |
324 | ||
325 | charger->regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
326 | if (!charger->regmap) { | |
327 | dev_err(&pdev->dev, "Parent did not provide regmap\n"); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | ret = act8945a_charger_config(pdev->dev.parent, charger); | |
332 | if (ret) | |
333 | return ret; | |
334 | ||
335 | psy_cfg.of_node = pdev->dev.parent->of_node; | |
336 | psy_cfg.drv_data = charger; | |
337 | ||
338 | psy = devm_power_supply_register(&pdev->dev, | |
339 | &act8945a_charger_desc, | |
340 | &psy_cfg); | |
341 | if (IS_ERR(psy)) { | |
342 | dev_err(&pdev->dev, "failed to register power supply\n"); | |
343 | return PTR_ERR(psy); | |
344 | } | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static struct platform_driver act8945a_charger_driver = { | |
350 | .driver = { | |
351 | .name = "act8945a-charger", | |
352 | }, | |
353 | .probe = act8945a_charger_probe, | |
354 | }; | |
355 | module_platform_driver(act8945a_charger_driver); | |
356 | ||
357 | MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver"); | |
358 | MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); | |
359 | MODULE_LICENSE("GPL"); |