ipaq_micro_battery.c

  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
 38struct 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
 49static 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
 91static 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
111static 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
128static 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
176static 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
193static 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
202static 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
211static enum power_supply_property micro_ac_power_props[] = {
212	POWER_SUPPLY_PROP_ONLINE,
213};
214
215static 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
223static struct power_supply *micro_batt_power, *micro_ac_power;
224
225static 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",
236				 WQ_MEM_RECLAIM | WQ_PERCPU, 0);
237	if (!mb->wq)
238		return -ENOMEM;
239
240	INIT_DELAYED_WORK(&mb->update, micro_battery_work);
241	platform_set_drvdata(pdev, mb);
242	queue_delayed_work(mb->wq, &mb->update, 1);
243
244	micro_batt_power = power_supply_register(&pdev->dev,
245						 &micro_batt_power_desc, NULL);
246	if (IS_ERR(micro_batt_power)) {
247		ret = PTR_ERR(micro_batt_power);
248		goto batt_err;
249	}
250
251	micro_ac_power = power_supply_register(&pdev->dev,
252					       &micro_ac_power_desc, NULL);
253	if (IS_ERR(micro_ac_power)) {
254		ret = PTR_ERR(micro_ac_power);
255		goto ac_err;
256	}
257
258	dev_info(&pdev->dev, "iPAQ micro battery driver\n");
259	return 0;
260
261ac_err:
262	power_supply_unregister(micro_batt_power);
263batt_err:
264	cancel_delayed_work_sync(&mb->update);
265	destroy_workqueue(mb->wq);
266	return ret;
267}
268
269static void micro_batt_remove(struct platform_device *pdev)
270
271{
272	struct micro_battery *mb = platform_get_drvdata(pdev);
273
274	power_supply_unregister(micro_ac_power);
275	power_supply_unregister(micro_batt_power);
276	cancel_delayed_work_sync(&mb->update);
277	destroy_workqueue(mb->wq);
278}
279
280static int __maybe_unused micro_batt_suspend(struct device *dev)
281{
282	struct micro_battery *mb = dev_get_drvdata(dev);
283
284	cancel_delayed_work_sync(&mb->update);
285	return 0;
286}
287
288static int __maybe_unused micro_batt_resume(struct device *dev)
289{
290	struct micro_battery *mb = dev_get_drvdata(dev);
291
292	queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
293	return 0;
294}
295
296static const struct dev_pm_ops micro_batt_dev_pm_ops = {
297	SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
298};
299
300static struct platform_driver micro_batt_device_driver = {
301	.driver		= {
302		.name	= "ipaq-micro-battery",
303		.pm	= &micro_batt_dev_pm_ops,
304	},
305	.probe		= micro_batt_probe,
306	.remove		= micro_batt_remove,
307};
308module_platform_driver(micro_batt_device_driver);
309
310MODULE_LICENSE("GPL");
311MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
312MODULE_ALIAS("platform:ipaq-micro-battery");