tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Battery and Power Management code for the Sharp SL-5x00
3 *
4 * Copyright (C) 2009 Thomas Kunze
5 *
6 * based on tosa_battery.c
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/kernel.h>
14#include <linux/module.h>
15#include <linux/power_supply.h>
16#include <linux/delay.h>
17#include <linux/spinlock.h>
18#include <linux/interrupt.h>
19#include <linux/gpio.h>
20#include <linux/mfd/ucb1x00.h>
21
22#include <asm/mach/sharpsl_param.h>
23#include <asm/mach-types.h>
24#include <mach/collie.h>
25
26static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
27static struct work_struct bat_work;
28static struct ucb1x00 *ucb;
29
30struct collie_bat {
31 int status;
32 struct power_supply psy;
33 int full_chrg;
34
35 struct mutex work_lock; /* protects data */
36
37 bool (*is_present)(struct collie_bat *bat);
38 int gpio_full;
39 int gpio_charge_on;
40
41 int technology;
42
43 int gpio_bat;
44 int adc_bat;
45 int adc_bat_divider;
46 int bat_max;
47 int bat_min;
48
49 int gpio_temp;
50 int adc_temp;
51 int adc_temp_divider;
52};
53
54static struct collie_bat collie_bat_main;
55
56static unsigned long collie_read_bat(struct collie_bat *bat)
57{
58 unsigned long value = 0;
59
60 if (bat->gpio_bat < 0 || bat->adc_bat < 0)
61 return 0;
62 mutex_lock(&bat_lock);
63 gpio_set_value(bat->gpio_bat, 1);
64 msleep(5);
65 ucb1x00_adc_enable(ucb);
66 value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
67 ucb1x00_adc_disable(ucb);
68 gpio_set_value(bat->gpio_bat, 0);
69 mutex_unlock(&bat_lock);
70 value = value * 1000000 / bat->adc_bat_divider;
71
72 return value;
73}
74
75static unsigned long collie_read_temp(struct collie_bat *bat)
76{
77 unsigned long value = 0;
78 if (bat->gpio_temp < 0 || bat->adc_temp < 0)
79 return 0;
80
81 mutex_lock(&bat_lock);
82 gpio_set_value(bat->gpio_temp, 1);
83 msleep(5);
84 ucb1x00_adc_enable(ucb);
85 value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
86 ucb1x00_adc_disable(ucb);
87 gpio_set_value(bat->gpio_temp, 0);
88 mutex_unlock(&bat_lock);
89
90 value = value * 10000 / bat->adc_temp_divider;
91
92 return value;
93}
94
95static int collie_bat_get_property(struct power_supply *psy,
96 enum power_supply_property psp,
97 union power_supply_propval *val)
98{
99 int ret = 0;
100 struct collie_bat *bat = container_of(psy, struct collie_bat, psy);
101
102 if (bat->is_present && !bat->is_present(bat)
103 && psp != POWER_SUPPLY_PROP_PRESENT) {
104 return -ENODEV;
105 }
106
107 switch (psp) {
108 case POWER_SUPPLY_PROP_STATUS:
109 val->intval = bat->status;
110 break;
111 case POWER_SUPPLY_PROP_TECHNOLOGY:
112 val->intval = bat->technology;
113 break;
114 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
115 val->intval = collie_read_bat(bat);
116 break;
117 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
118 if (bat->full_chrg == -1)
119 val->intval = bat->bat_max;
120 else
121 val->intval = bat->full_chrg;
122 break;
123 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
124 val->intval = bat->bat_max;
125 break;
126 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
127 val->intval = bat->bat_min;
128 break;
129 case POWER_SUPPLY_PROP_TEMP:
130 val->intval = collie_read_temp(bat);
131 break;
132 case POWER_SUPPLY_PROP_PRESENT:
133 val->intval = bat->is_present ? bat->is_present(bat) : 1;
134 break;
135 default:
136 ret = -EINVAL;
137 break;
138 }
139 return ret;
140}
141
142static void collie_bat_external_power_changed(struct power_supply *psy)
143{
144 schedule_work(&bat_work);
145}
146
147static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
148{
149 pr_info("collie_bat_gpio irq\n");
150 schedule_work(&bat_work);
151 return IRQ_HANDLED;
152}
153
154static void collie_bat_update(struct collie_bat *bat)
155{
156 int old;
157 struct power_supply *psy = &bat->psy;
158
159 mutex_lock(&bat->work_lock);
160
161 old = bat->status;
162
163 if (bat->is_present && !bat->is_present(bat)) {
164 printk(KERN_NOTICE "%s not present\n", psy->name);
165 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
166 bat->full_chrg = -1;
167 } else if (power_supply_am_i_supplied(psy)) {
168 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
169 gpio_set_value(bat->gpio_charge_on, 1);
170 mdelay(15);
171 }
172
173 if (gpio_get_value(bat->gpio_full)) {
174 if (old == POWER_SUPPLY_STATUS_CHARGING ||
175 bat->full_chrg == -1)
176 bat->full_chrg = collie_read_bat(bat);
177
178 gpio_set_value(bat->gpio_charge_on, 0);
179 bat->status = POWER_SUPPLY_STATUS_FULL;
180 } else {
181 gpio_set_value(bat->gpio_charge_on, 1);
182 bat->status = POWER_SUPPLY_STATUS_CHARGING;
183 }
184 } else {
185 gpio_set_value(bat->gpio_charge_on, 0);
186 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
187 }
188
189 if (old != bat->status)
190 power_supply_changed(psy);
191
192 mutex_unlock(&bat->work_lock);
193}
194
195static void collie_bat_work(struct work_struct *work)
196{
197 collie_bat_update(&collie_bat_main);
198}
199
200
201static enum power_supply_property collie_bat_main_props[] = {
202 POWER_SUPPLY_PROP_STATUS,
203 POWER_SUPPLY_PROP_TECHNOLOGY,
204 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
205 POWER_SUPPLY_PROP_VOLTAGE_NOW,
206 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
207 POWER_SUPPLY_PROP_VOLTAGE_MAX,
208 POWER_SUPPLY_PROP_PRESENT,
209 POWER_SUPPLY_PROP_TEMP,
210};
211
212static enum power_supply_property collie_bat_bu_props[] = {
213 POWER_SUPPLY_PROP_STATUS,
214 POWER_SUPPLY_PROP_TECHNOLOGY,
215 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
216 POWER_SUPPLY_PROP_VOLTAGE_NOW,
217 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
218 POWER_SUPPLY_PROP_VOLTAGE_MAX,
219 POWER_SUPPLY_PROP_PRESENT,
220};
221
222static struct collie_bat collie_bat_main = {
223 .status = POWER_SUPPLY_STATUS_DISCHARGING,
224 .full_chrg = -1,
225 .psy = {
226 .name = "main-battery",
227 .type = POWER_SUPPLY_TYPE_BATTERY,
228 .properties = collie_bat_main_props,
229 .num_properties = ARRAY_SIZE(collie_bat_main_props),
230 .get_property = collie_bat_get_property,
231 .external_power_changed = collie_bat_external_power_changed,
232 .use_for_apm = 1,
233 },
234
235 .gpio_full = COLLIE_GPIO_CO,
236 .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
237
238 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
239
240 .gpio_bat = COLLIE_GPIO_MBAT_ON,
241 .adc_bat = UCB_ADC_INP_AD1,
242 .adc_bat_divider = 155,
243 .bat_max = 4310000,
244 .bat_min = 1551 * 1000000 / 414,
245
246 .gpio_temp = COLLIE_GPIO_TMP_ON,
247 .adc_temp = UCB_ADC_INP_AD0,
248 .adc_temp_divider = 10000,
249};
250
251static struct collie_bat collie_bat_bu = {
252 .status = POWER_SUPPLY_STATUS_UNKNOWN,
253 .full_chrg = -1,
254
255 .psy = {
256 .name = "backup-battery",
257 .type = POWER_SUPPLY_TYPE_BATTERY,
258 .properties = collie_bat_bu_props,
259 .num_properties = ARRAY_SIZE(collie_bat_bu_props),
260 .get_property = collie_bat_get_property,
261 .external_power_changed = collie_bat_external_power_changed,
262 },
263
264 .gpio_full = -1,
265 .gpio_charge_on = -1,
266
267 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
268
269 .gpio_bat = COLLIE_GPIO_BBAT_ON,
270 .adc_bat = UCB_ADC_INP_AD1,
271 .adc_bat_divider = 155,
272 .bat_max = 3000000,
273 .bat_min = 1900000,
274
275 .gpio_temp = -1,
276 .adc_temp = -1,
277 .adc_temp_divider = -1,
278};
279
280static struct gpio collie_batt_gpios[] = {
281 { COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
282 { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
283 { COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
284 { COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
285 { COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
286 { COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
287};
288
289#ifdef CONFIG_PM
290static int collie_bat_suspend(struct ucb1x00_dev *dev)
291{
292 /* flush all pending status updates */
293 flush_work(&bat_work);
294 return 0;
295}
296
297static int collie_bat_resume(struct ucb1x00_dev *dev)
298{
299 /* things may have changed while we were away */
300 schedule_work(&bat_work);
301 return 0;
302}
303#else
304#define collie_bat_suspend NULL
305#define collie_bat_resume NULL
306#endif
307
308static int collie_bat_probe(struct ucb1x00_dev *dev)
309{
310 int ret;
311
312 if (!machine_is_collie())
313 return -ENODEV;
314
315 ucb = dev->ucb;
316
317 ret = gpio_request_array(collie_batt_gpios,
318 ARRAY_SIZE(collie_batt_gpios));
319 if (ret)
320 return ret;
321
322 mutex_init(&collie_bat_main.work_lock);
323
324 INIT_WORK(&bat_work, collie_bat_work);
325
326 ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
327 if (ret)
328 goto err_psy_reg_main;
329 ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
330 if (ret)
331 goto err_psy_reg_bu;
332
333 ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
334 collie_bat_gpio_isr,
335 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
336 "main full", &collie_bat_main);
337 if (!ret) {
338 schedule_work(&bat_work);
339 return 0;
340 }
341 power_supply_unregister(&collie_bat_bu.psy);
342err_psy_reg_bu:
343 power_supply_unregister(&collie_bat_main.psy);
344err_psy_reg_main:
345
346 /* see comment in collie_bat_remove */
347 cancel_work_sync(&bat_work);
348 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
349 return ret;
350}
351
352static void collie_bat_remove(struct ucb1x00_dev *dev)
353{
354 free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
355
356 power_supply_unregister(&collie_bat_bu.psy);
357 power_supply_unregister(&collie_bat_main.psy);
358
359 /*
360 * Now cancel the bat_work. We won't get any more schedules,
361 * since all sources (isr and external_power_changed) are
362 * unregistered now.
363 */
364 cancel_work_sync(&bat_work);
365 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
366}
367
368static struct ucb1x00_driver collie_bat_driver = {
369 .add = collie_bat_probe,
370 .remove = collie_bat_remove,
371 .suspend = collie_bat_suspend,
372 .resume = collie_bat_resume,
373};
374
375static int __init collie_bat_init(void)
376{
377 return ucb1x00_register_driver(&collie_bat_driver);
378}
379
380static void __exit collie_bat_exit(void)
381{
382 ucb1x00_unregister_driver(&collie_bat_driver);
383}
384
385module_init(collie_bat_init);
386module_exit(collie_bat_exit);
387
388MODULE_LICENSE("GPL");
389MODULE_AUTHOR("Thomas Kunze");
390MODULE_DESCRIPTION("Collie battery driver");