1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
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>
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
micro_battery_work(struct work_struct * work)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
get_capacity(struct power_supply * b)91 static int get_capacity(struct power_supply *b)
92 {
93 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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
get_status(struct power_supply * b)111 static int get_status(struct power_supply *b)
112 {
113 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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
micro_batt_get_property(struct power_supply * b,enum power_supply_property psp,union power_supply_propval * val)128 static int micro_batt_get_property(struct power_supply *b,
129 enum power_supply_property psp,
130 union power_supply_propval *val)
131 {
132 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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;
152 };
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;
171 };
172
173 return 0;
174 }
175
micro_ac_get_property(struct power_supply * b,enum power_supply_property psp,union power_supply_propval * val)176 static int micro_ac_get_property(struct power_supply *b,
177 enum power_supply_property psp,
178 union power_supply_propval *val)
179 {
180 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
181
182 switch (psp) {
183 case POWER_SUPPLY_PROP_ONLINE:
184 val->intval = mb->ac;
185 break;
186 default:
187 return -EINVAL;
188 };
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
202 static const struct power_supply_desc micro_batt_power_desc = {
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
215 static const struct power_supply_desc micro_ac_power_desc = {
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
223 static struct power_supply *micro_batt_power, *micro_ac_power;
224
micro_batt_probe(struct platform_device * pdev)225 static int micro_batt_probe(struct platform_device *pdev)
226 {
227 struct micro_battery *mb;
228 int ret;
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 = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0);
236 if (!mb->wq)
237 return -ENOMEM;
238
239 INIT_DELAYED_WORK(&mb->update, micro_battery_work);
240 platform_set_drvdata(pdev, mb);
241 queue_delayed_work(mb->wq, &mb->update, 1);
242
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);
247 goto batt_err;
248 }
249
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);
254 goto ac_err;
255 }
256
257 dev_info(&pdev->dev, "iPAQ micro battery driver\n");
258 return 0;
259
260 ac_err:
261 power_supply_unregister(micro_batt_power);
262 batt_err:
263 cancel_delayed_work_sync(&mb->update);
264 destroy_workqueue(mb->wq);
265 return ret;
266 }
267
micro_batt_remove(struct platform_device * pdev)268 static int micro_batt_remove(struct platform_device *pdev)
269
270 {
271 struct micro_battery *mb = platform_get_drvdata(pdev);
272
273 power_supply_unregister(micro_ac_power);
274 power_supply_unregister(micro_batt_power);
275 cancel_delayed_work_sync(&mb->update);
276 destroy_workqueue(mb->wq);
277
278 return 0;
279 }
280
micro_batt_suspend(struct device * dev)281 static int __maybe_unused micro_batt_suspend(struct device *dev)
282 {
283 struct micro_battery *mb = dev_get_drvdata(dev);
284
285 cancel_delayed_work_sync(&mb->update);
286 return 0;
287 }
288
micro_batt_resume(struct device * dev)289 static int __maybe_unused micro_batt_resume(struct device *dev)
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
301 static struct platform_driver micro_batt_device_driver = {
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");
313 MODULE_ALIAS("platform:ipaq-micro-battery");
314
