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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);
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;
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 = power_supply_get_drvdata(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->desc->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 const struct power_supply_desc collie_bat_main_desc = {
223 .name = "main-battery",
224 .type = POWER_SUPPLY_TYPE_BATTERY,
225 .properties = collie_bat_main_props,
226 .num_properties = ARRAY_SIZE(collie_bat_main_props),
227 .get_property = collie_bat_get_property,
228 .external_power_changed = collie_bat_external_power_changed,
229 .use_for_apm = 1,
230};
231
232static struct collie_bat collie_bat_main = {
233 .status = POWER_SUPPLY_STATUS_DISCHARGING,
234 .full_chrg = -1,
235 .psy = NULL,
236
237 .gpio_full = COLLIE_GPIO_CO,
238 .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
239
240 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
241
242 .gpio_bat = COLLIE_GPIO_MBAT_ON,
243 .adc_bat = UCB_ADC_INP_AD1,
244 .adc_bat_divider = 155,
245 .bat_max = 4310000,
246 .bat_min = 1551 * 1000000 / 414,
247
248 .gpio_temp = COLLIE_GPIO_TMP_ON,
249 .adc_temp = UCB_ADC_INP_AD0,
250 .adc_temp_divider = 10000,
251};
252
253static const struct power_supply_desc collie_bat_bu_desc = {
254 .name = "backup-battery",
255 .type = POWER_SUPPLY_TYPE_BATTERY,
256 .properties = collie_bat_bu_props,
257 .num_properties = ARRAY_SIZE(collie_bat_bu_props),
258 .get_property = collie_bat_get_property,
259 .external_power_changed = collie_bat_external_power_changed,
260};
261
262static struct collie_bat collie_bat_bu = {
263 .status = POWER_SUPPLY_STATUS_UNKNOWN,
264 .full_chrg = -1,
265 .psy = NULL,
266
267 .gpio_full = -1,
268 .gpio_charge_on = -1,
269
270 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
271
272 .gpio_bat = COLLIE_GPIO_BBAT_ON,
273 .adc_bat = UCB_ADC_INP_AD1,
274 .adc_bat_divider = 155,
275 .bat_max = 3000000,
276 .bat_min = 1900000,
277
278 .gpio_temp = -1,
279 .adc_temp = -1,
280 .adc_temp_divider = -1,
281};
282
283static struct gpio collie_batt_gpios[] = {
284 { COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
285 { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
286 { COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
287 { COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
288 { COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
289 { COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
290};
291
292#ifdef CONFIG_PM
293static int wakeup_enabled;
294
295static int collie_bat_suspend(struct ucb1x00_dev *dev)
296{
297
298 flush_work(&bat_work);
299
300 if (device_may_wakeup(&dev->ucb->dev) &&
301 collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
302 wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
303 else
304 wakeup_enabled = 0;
305
306 return 0;
307}
308
309static int collie_bat_resume(struct ucb1x00_dev *dev)
310{
311 if (wakeup_enabled)
312 disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
313
314
315 schedule_work(&bat_work);
316 return 0;
317}
318#else
319#define collie_bat_suspend NULL
320#define collie_bat_resume NULL
321#endif
322
323static int collie_bat_probe(struct ucb1x00_dev *dev)
324{
325 int ret;
326 struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
327
328 if (!machine_is_collie())
329 return -ENODEV;
330
331 ucb = dev->ucb;
332
333 ret = gpio_request_array(collie_batt_gpios,
334 ARRAY_SIZE(collie_batt_gpios));
335 if (ret)
336 return ret;
337
338 mutex_init(&collie_bat_main.work_lock);
339
340 INIT_WORK(&bat_work, collie_bat_work);
341
342 psy_main_cfg.drv_data = &collie_bat_main;
343 collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
344 &collie_bat_main_desc,
345 &psy_main_cfg);
346 if (IS_ERR(collie_bat_main.psy)) {
347 ret = PTR_ERR(collie_bat_main.psy);
348 goto err_psy_reg_main;
349 }
350
351 psy_bu_cfg.drv_data = &collie_bat_bu;
352 collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
353 &collie_bat_bu_desc,
354 &psy_bu_cfg);
355 if (IS_ERR(collie_bat_bu.psy)) {
356 ret = PTR_ERR(collie_bat_bu.psy);
357 goto err_psy_reg_bu;
358 }
359
360 ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
361 collie_bat_gpio_isr,
362 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
363 "main full", &collie_bat_main);
364 if (ret)
365 goto err_irq;
366
367 device_init_wakeup(&ucb->dev, 1);
368 schedule_work(&bat_work);
369
370 return 0;
371
372err_irq:
373 power_supply_unregister(collie_bat_bu.psy);
374err_psy_reg_bu:
375 power_supply_unregister(collie_bat_main.psy);
376err_psy_reg_main:
377
378
379 cancel_work_sync(&bat_work);
380 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
381 return ret;
382}
383
384static void collie_bat_remove(struct ucb1x00_dev *dev)
385{
386 free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
387
388 power_supply_unregister(collie_bat_bu.psy);
389 power_supply_unregister(collie_bat_main.psy);
390
391
392
393
394
395
396 cancel_work_sync(&bat_work);
397 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
398}
399
400static struct ucb1x00_driver collie_bat_driver = {
401 .add = collie_bat_probe,
402 .remove = collie_bat_remove,
403 .suspend = collie_bat_suspend,
404 .resume = collie_bat_resume,
405};
406
407static int __init collie_bat_init(void)
408{
409 return ucb1x00_register_driver(&collie_bat_driver);
410}
411
412static void __exit collie_bat_exit(void)
413{
414 ucb1x00_unregister_driver(&collie_bat_driver);
415}
416
417module_init(collie_bat_init);
418module_exit(collie_bat_exit);
419
420MODULE_LICENSE("GPL");
421MODULE_AUTHOR("Thomas Kunze");
422MODULE_DESCRIPTION("Collie battery driver");
423
