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