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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
00a588f9 | 2 | /* |
00a588f9 DA |
3 | * |
4 | * h3xxx atmel micro companion support, battery subdevice | |
5 | * based on previous kernel 2.4 version | |
6 | * Author : Alessandro Gardich <gremlin@gremlin.it> | |
7 | * Author : Linus Walleij <linus.walleij@linaro.org> | |
00a588f9 DA |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/mfd/ipaq-micro.h> | |
14 | #include <linux/power_supply.h> | |
15 | #include <linux/workqueue.h> | |
16 | ||
17 | #define BATT_PERIOD 100000 /* 100 seconds in milliseconds */ | |
18 | ||
19 | #define MICRO_BATT_CHEM_ALKALINE 0x01 | |
20 | #define MICRO_BATT_CHEM_NICD 0x02 | |
21 | #define MICRO_BATT_CHEM_NIMH 0x03 | |
22 | #define MICRO_BATT_CHEM_LION 0x04 | |
23 | #define MICRO_BATT_CHEM_LIPOLY 0x05 | |
24 | #define MICRO_BATT_CHEM_NOT_INSTALLED 0x06 | |
25 | #define MICRO_BATT_CHEM_UNKNOWN 0xff | |
26 | ||
27 | #define MICRO_BATT_STATUS_HIGH 0x01 | |
28 | #define MICRO_BATT_STATUS_LOW 0x02 | |
29 | #define MICRO_BATT_STATUS_CRITICAL 0x04 | |
30 | #define MICRO_BATT_STATUS_CHARGING 0x08 | |
31 | #define MICRO_BATT_STATUS_CHARGEMAIN 0x10 | |
32 | #define MICRO_BATT_STATUS_DEAD 0x20 /* Battery will not charge */ | |
33 | #define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */ | |
34 | #define MICRO_BATT_STATUS_FULL 0x40 /* Battery fully charged */ | |
35 | #define MICRO_BATT_STATUS_NOBATTERY 0x80 | |
36 | #define MICRO_BATT_STATUS_UNKNOWN 0xff | |
37 | ||
38 | struct micro_battery { | |
39 | struct ipaq_micro *micro; | |
40 | struct workqueue_struct *wq; | |
41 | struct delayed_work update; | |
42 | u8 ac; | |
43 | u8 chemistry; | |
44 | unsigned int voltage; | |
45 | u16 temperature; | |
46 | u8 flag; | |
47 | }; | |
48 | ||
49 | static void micro_battery_work(struct work_struct *work) | |
50 | { | |
51 | struct micro_battery *mb = container_of(work, | |
52 | struct micro_battery, update.work); | |
53 | struct ipaq_micro_msg msg_battery = { | |
54 | .id = MSG_BATTERY, | |
55 | }; | |
56 | struct ipaq_micro_msg msg_sensor = { | |
57 | .id = MSG_THERMAL_SENSOR, | |
58 | }; | |
59 | ||
60 | /* First send battery message */ | |
61 | ipaq_micro_tx_msg_sync(mb->micro, &msg_battery); | |
62 | if (msg_battery.rx_len < 4) | |
63 | pr_info("ERROR"); | |
64 | ||
65 | /* | |
66 | * Returned message format: | |
67 | * byte 0: 0x00 = Not plugged in | |
68 | * 0x01 = AC adapter plugged in | |
69 | * byte 1: chemistry | |
70 | * byte 2: voltage LSB | |
71 | * byte 3: voltage MSB | |
72 | * byte 4: flags | |
73 | * byte 5-9: same for battery 2 | |
74 | */ | |
75 | mb->ac = msg_battery.rx_data[0]; | |
76 | mb->chemistry = msg_battery.rx_data[1]; | |
77 | mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) + | |
78 | msg_battery.rx_data[2]) * 5000L) * 1000 / 1024; | |
79 | mb->flag = msg_battery.rx_data[4]; | |
80 | ||
81 | if (msg_battery.rx_len == 9) | |
82 | pr_debug("second battery ignored\n"); | |
83 | ||
84 | /* Then read the sensor */ | |
85 | ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor); | |
86 | mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0]; | |
87 | ||
88 | queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD)); | |
89 | } | |
90 | ||
91 | static int get_capacity(struct power_supply *b) | |
92 | { | |
297d716f | 93 | struct micro_battery *mb = dev_get_drvdata(b->dev.parent); |
00a588f9 DA |
94 | |
95 | switch (mb->flag & 0x07) { | |
96 | case MICRO_BATT_STATUS_HIGH: | |
97 | return 100; | |
98 | break; | |
99 | case MICRO_BATT_STATUS_LOW: | |
100 | return 50; | |
101 | break; | |
102 | case MICRO_BATT_STATUS_CRITICAL: | |
103 | return 5; | |
104 | break; | |
105 | default: | |
106 | break; | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static int get_status(struct power_supply *b) | |
112 | { | |
297d716f | 113 | struct micro_battery *mb = dev_get_drvdata(b->dev.parent); |
00a588f9 DA |
114 | |
115 | if (mb->flag == MICRO_BATT_STATUS_UNKNOWN) | |
116 | return POWER_SUPPLY_STATUS_UNKNOWN; | |
117 | ||
118 | if (mb->flag & MICRO_BATT_STATUS_FULL) | |
119 | return POWER_SUPPLY_STATUS_FULL; | |
120 | ||
121 | if ((mb->flag & MICRO_BATT_STATUS_CHARGING) || | |
122 | (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN)) | |
123 | return POWER_SUPPLY_STATUS_CHARGING; | |
124 | ||
125 | return POWER_SUPPLY_STATUS_DISCHARGING; | |
126 | } | |
127 | ||
128 | static int micro_batt_get_property(struct power_supply *b, | |
129 | enum power_supply_property psp, | |
130 | union power_supply_propval *val) | |
131 | { | |
297d716f | 132 | struct micro_battery *mb = dev_get_drvdata(b->dev.parent); |
00a588f9 DA |
133 | |
134 | switch (psp) { | |
135 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
136 | switch (mb->chemistry) { | |
137 | case MICRO_BATT_CHEM_NICD: | |
138 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd; | |
139 | break; | |
140 | case MICRO_BATT_CHEM_NIMH: | |
141 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; | |
142 | break; | |
143 | case MICRO_BATT_CHEM_LION: | |
144 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
145 | break; | |
146 | case MICRO_BATT_CHEM_LIPOLY: | |
147 | val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO; | |
148 | break; | |
149 | default: | |
150 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; | |
151 | break; | |
3d32a843 | 152 | } |
00a588f9 DA |
153 | break; |
154 | case POWER_SUPPLY_PROP_STATUS: | |
155 | val->intval = get_status(b); | |
156 | break; | |
157 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
158 | val->intval = 4700000; | |
159 | break; | |
160 | case POWER_SUPPLY_PROP_CAPACITY: | |
161 | val->intval = get_capacity(b); | |
162 | break; | |
163 | case POWER_SUPPLY_PROP_TEMP: | |
164 | val->intval = mb->temperature; | |
165 | break; | |
166 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
167 | val->intval = mb->voltage; | |
168 | break; | |
169 | default: | |
170 | return -EINVAL; | |
3d32a843 | 171 | } |
00a588f9 DA |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int micro_ac_get_property(struct power_supply *b, | |
177 | enum power_supply_property psp, | |
178 | union power_supply_propval *val) | |
179 | { | |
297d716f | 180 | struct micro_battery *mb = dev_get_drvdata(b->dev.parent); |
00a588f9 DA |
181 | |
182 | switch (psp) { | |
183 | case POWER_SUPPLY_PROP_ONLINE: | |
184 | val->intval = mb->ac; | |
185 | break; | |
186 | default: | |
187 | return -EINVAL; | |
3d32a843 | 188 | } |
00a588f9 DA |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static enum power_supply_property micro_batt_power_props[] = { | |
194 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
195 | POWER_SUPPLY_PROP_STATUS, | |
196 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, | |
197 | POWER_SUPPLY_PROP_CAPACITY, | |
198 | POWER_SUPPLY_PROP_TEMP, | |
199 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
200 | }; | |
201 | ||
297d716f | 202 | static const struct power_supply_desc micro_batt_power_desc = { |
00a588f9 DA |
203 | .name = "main-battery", |
204 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
205 | .properties = micro_batt_power_props, | |
206 | .num_properties = ARRAY_SIZE(micro_batt_power_props), | |
207 | .get_property = micro_batt_get_property, | |
208 | .use_for_apm = 1, | |
209 | }; | |
210 | ||
211 | static enum power_supply_property micro_ac_power_props[] = { | |
212 | POWER_SUPPLY_PROP_ONLINE, | |
213 | }; | |
214 | ||
297d716f | 215 | static const struct power_supply_desc micro_ac_power_desc = { |
00a588f9 DA |
216 | .name = "ac", |
217 | .type = POWER_SUPPLY_TYPE_MAINS, | |
218 | .properties = micro_ac_power_props, | |
219 | .num_properties = ARRAY_SIZE(micro_ac_power_props), | |
220 | .get_property = micro_ac_get_property, | |
221 | }; | |
222 | ||
297d716f KK |
223 | static struct power_supply *micro_batt_power, *micro_ac_power; |
224 | ||
00a588f9 DA |
225 | static int micro_batt_probe(struct platform_device *pdev) |
226 | { | |
227 | struct micro_battery *mb; | |
a2c1d531 | 228 | int ret; |
00a588f9 DA |
229 | |
230 | mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL); | |
231 | if (!mb) | |
232 | return -ENOMEM; | |
233 | ||
234 | mb->micro = dev_get_drvdata(pdev->dev.parent); | |
829f0e97 | 235 | mb->wq = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0); |
a2c1d531 KK |
236 | if (!mb->wq) |
237 | return -ENOMEM; | |
238 | ||
00a588f9 DA |
239 | INIT_DELAYED_WORK(&mb->update, micro_battery_work); |
240 | platform_set_drvdata(pdev, mb); | |
241 | queue_delayed_work(mb->wq, &mb->update, 1); | |
a2c1d531 | 242 | |
297d716f KK |
243 | micro_batt_power = power_supply_register(&pdev->dev, |
244 | µ_batt_power_desc, NULL); | |
245 | if (IS_ERR(micro_batt_power)) { | |
246 | ret = PTR_ERR(micro_batt_power); | |
a2c1d531 | 247 | goto batt_err; |
297d716f | 248 | } |
a2c1d531 | 249 | |
297d716f KK |
250 | micro_ac_power = power_supply_register(&pdev->dev, |
251 | µ_ac_power_desc, NULL); | |
252 | if (IS_ERR(micro_ac_power)) { | |
253 | ret = PTR_ERR(micro_ac_power); | |
a2c1d531 | 254 | goto ac_err; |
297d716f | 255 | } |
00a588f9 DA |
256 | |
257 | dev_info(&pdev->dev, "iPAQ micro battery driver\n"); | |
258 | return 0; | |
a2c1d531 KK |
259 | |
260 | ac_err: | |
b9223da4 | 261 | power_supply_unregister(micro_batt_power); |
a2c1d531 KK |
262 | batt_err: |
263 | cancel_delayed_work_sync(&mb->update); | |
264 | destroy_workqueue(mb->wq); | |
265 | return ret; | |
00a588f9 DA |
266 | } |
267 | ||
268 | static int micro_batt_remove(struct platform_device *pdev) | |
269 | ||
270 | { | |
271 | struct micro_battery *mb = platform_get_drvdata(pdev); | |
272 | ||
297d716f KK |
273 | power_supply_unregister(micro_ac_power); |
274 | power_supply_unregister(micro_batt_power); | |
00a588f9 | 275 | cancel_delayed_work_sync(&mb->update); |
f852ec46 | 276 | destroy_workqueue(mb->wq); |
00a588f9 DA |
277 | |
278 | return 0; | |
279 | } | |
280 | ||
298cb0f1 | 281 | static int __maybe_unused micro_batt_suspend(struct device *dev) |
00a588f9 DA |
282 | { |
283 | struct micro_battery *mb = dev_get_drvdata(dev); | |
284 | ||
285 | cancel_delayed_work_sync(&mb->update); | |
286 | return 0; | |
287 | } | |
288 | ||
298cb0f1 | 289 | static int __maybe_unused micro_batt_resume(struct device *dev) |
00a588f9 DA |
290 | { |
291 | struct micro_battery *mb = dev_get_drvdata(dev); | |
292 | ||
293 | queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD)); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static const struct dev_pm_ops micro_batt_dev_pm_ops = { | |
298 | SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume) | |
299 | }; | |
300 | ||
5e37195f | 301 | static struct platform_driver micro_batt_device_driver = { |
00a588f9 DA |
302 | .driver = { |
303 | .name = "ipaq-micro-battery", | |
304 | .pm = µ_batt_dev_pm_ops, | |
305 | }, | |
306 | .probe = micro_batt_probe, | |
307 | .remove = micro_batt_remove, | |
308 | }; | |
309 | module_platform_driver(micro_batt_device_driver); | |
310 | ||
311 | MODULE_LICENSE("GPL"); | |
312 | MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery"); | |
5ee1d39e | 313 | MODULE_ALIAS("platform:ipaq-micro-battery"); |