1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Battery and Power Management code for the Sharp SL-5x00
4 *
5 * Copyright (C) 2009 Thomas Kunze
6 *
7 * based on tosa_battery.c
8 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/power_supply.h>
12 #include <linux/delay.h>
13 #include <linux/spinlock.h>
14 #include <linux/interrupt.h>
15 #include <linux/gpio.h>
16 #include <linux/mfd/ucb1x00.h>
17
18 #include <asm/mach/sharpsl_param.h>
19 #include <asm/mach-types.h>
20 #include <mach/collie.h>
21
22 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
23 static struct work_struct bat_work;
24 static struct ucb1x00 *ucb;
25
26 struct collie_bat {
27 int status;
28 struct power_supply *psy;
29 int full_chrg;
30
31 struct mutex work_lock; /* protects data */
32
33 bool (*is_present)(struct collie_bat *bat);
34 int gpio_full;
35 int gpio_charge_on;
36
37 int technology;
38
39 int gpio_bat;
40 int adc_bat;
41 int adc_bat_divider;
42 int bat_max;
43 int bat_min;
44
45 int gpio_temp;
46 int adc_temp;
47 int adc_temp_divider;
48 };
49
50 static struct collie_bat collie_bat_main;
51
collie_read_bat(struct collie_bat * bat)52 static unsigned long collie_read_bat(struct collie_bat *bat)
53 {
54 unsigned long value = 0;
55
56 if (bat->gpio_bat < 0 || bat->adc_bat < 0)
57 return 0;
58 mutex_lock(&bat_lock);
59 gpio_set_value(bat->gpio_bat, 1);
60 msleep(5);
61 ucb1x00_adc_enable(ucb);
62 value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
63 ucb1x00_adc_disable(ucb);
64 gpio_set_value(bat->gpio_bat, 0);
65 mutex_unlock(&bat_lock);
66 value = value * 1000000 / bat->adc_bat_divider;
67
68 return value;
69 }
70
collie_read_temp(struct collie_bat * bat)71 static unsigned long collie_read_temp(struct collie_bat *bat)
72 {
73 unsigned long value = 0;
74 if (bat->gpio_temp < 0 || bat->adc_temp < 0)
75 return 0;
76
77 mutex_lock(&bat_lock);
78 gpio_set_value(bat->gpio_temp, 1);
79 msleep(5);
80 ucb1x00_adc_enable(ucb);
81 value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
82 ucb1x00_adc_disable(ucb);
83 gpio_set_value(bat->gpio_temp, 0);
84 mutex_unlock(&bat_lock);
85
86 value = value * 10000 / bat->adc_temp_divider;
87
88 return value;
89 }
90
collie_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)91 static int collie_bat_get_property(struct power_supply *psy,
92 enum power_supply_property psp,
93 union power_supply_propval *val)
94 {
95 int ret = 0;
96 struct collie_bat *bat = power_supply_get_drvdata(psy);
97
98 if (bat->is_present && !bat->is_present(bat)
99 && psp != POWER_SUPPLY_PROP_PRESENT) {
100 return -ENODEV;
101 }
102
103 switch (psp) {
104 case POWER_SUPPLY_PROP_STATUS:
105 val->intval = bat->status;
106 break;
107 case POWER_SUPPLY_PROP_TECHNOLOGY:
108 val->intval = bat->technology;
109 break;
110 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
111 val->intval = collie_read_bat(bat);
112 break;
113 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
114 if (bat->full_chrg == -1)
115 val->intval = bat->bat_max;
116 else
117 val->intval = bat->full_chrg;
118 break;
119 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
120 val->intval = bat->bat_max;
121 break;
122 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
123 val->intval = bat->bat_min;
124 break;
125 case POWER_SUPPLY_PROP_TEMP:
126 val->intval = collie_read_temp(bat);
127 break;
128 case POWER_SUPPLY_PROP_PRESENT:
129 val->intval = bat->is_present ? bat->is_present(bat) : 1;
130 break;
131 default:
132 ret = -EINVAL;
133 break;
134 }
135 return ret;
136 }
137
collie_bat_external_power_changed(struct power_supply * psy)138 static void collie_bat_external_power_changed(struct power_supply *psy)
139 {
140 schedule_work(&bat_work);
141 }
142
collie_bat_gpio_isr(int irq,void * data)143 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
144 {
145 pr_info("collie_bat_gpio irq\n");
146 schedule_work(&bat_work);
147 return IRQ_HANDLED;
148 }
149
collie_bat_update(struct collie_bat * bat)150 static void collie_bat_update(struct collie_bat *bat)
151 {
152 int old;
153 struct power_supply *psy = bat->psy;
154
155 mutex_lock(&bat->work_lock);
156
157 old = bat->status;
158
159 if (bat->is_present && !bat->is_present(bat)) {
160 printk(KERN_NOTICE "%s not present\n", psy->desc->name);
161 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
162 bat->full_chrg = -1;
163 } else if (power_supply_am_i_supplied(psy)) {
164 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
165 gpio_set_value(bat->gpio_charge_on, 1);
166 mdelay(15);
167 }
168
169 if (gpio_get_value(bat->gpio_full)) {
170 if (old == POWER_SUPPLY_STATUS_CHARGING ||
171 bat->full_chrg == -1)
172 bat->full_chrg = collie_read_bat(bat);
173
174 gpio_set_value(bat->gpio_charge_on, 0);
175 bat->status = POWER_SUPPLY_STATUS_FULL;
176 } else {
177 gpio_set_value(bat->gpio_charge_on, 1);
178 bat->status = POWER_SUPPLY_STATUS_CHARGING;
179 }
180 } else {
181 gpio_set_value(bat->gpio_charge_on, 0);
182 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
183 }
184
185 if (old != bat->status)
186 power_supply_changed(psy);
187
188 mutex_unlock(&bat->work_lock);
189 }
190
collie_bat_work(struct work_struct * work)191 static void collie_bat_work(struct work_struct *work)
192 {
193 collie_bat_update(&collie_bat_main);
194 }
195
196
197 static enum power_supply_property collie_bat_main_props[] = {
198 POWER_SUPPLY_PROP_STATUS,
199 POWER_SUPPLY_PROP_TECHNOLOGY,
200 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
201 POWER_SUPPLY_PROP_VOLTAGE_NOW,
202 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
203 POWER_SUPPLY_PROP_VOLTAGE_MAX,
204 POWER_SUPPLY_PROP_PRESENT,
205 POWER_SUPPLY_PROP_TEMP,
206 };
207
208 static enum power_supply_property collie_bat_bu_props[] = {
209 POWER_SUPPLY_PROP_STATUS,
210 POWER_SUPPLY_PROP_TECHNOLOGY,
211 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212 POWER_SUPPLY_PROP_VOLTAGE_NOW,
213 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
214 POWER_SUPPLY_PROP_VOLTAGE_MAX,
215 POWER_SUPPLY_PROP_PRESENT,
216 };
217
218 static const struct power_supply_desc collie_bat_main_desc = {
219 .name = "main-battery",
220 .type = POWER_SUPPLY_TYPE_BATTERY,
221 .properties = collie_bat_main_props,
222 .num_properties = ARRAY_SIZE(collie_bat_main_props),
223 .get_property = collie_bat_get_property,
224 .external_power_changed = collie_bat_external_power_changed,
225 .use_for_apm = 1,
226 };
227
228 static struct collie_bat collie_bat_main = {
229 .status = POWER_SUPPLY_STATUS_DISCHARGING,
230 .full_chrg = -1,
231 .psy = NULL,
232
233 .gpio_full = COLLIE_GPIO_CO,
234 .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
235
236 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
237
238 .gpio_bat = COLLIE_GPIO_MBAT_ON,
239 .adc_bat = UCB_ADC_INP_AD1,
240 .adc_bat_divider = 155,
241 .bat_max = 4310000,
242 .bat_min = 1551 * 1000000 / 414,
243
244 .gpio_temp = COLLIE_GPIO_TMP_ON,
245 .adc_temp = UCB_ADC_INP_AD0,
246 .adc_temp_divider = 10000,
247 };
248
249 static const struct power_supply_desc collie_bat_bu_desc = {
250 .name = "backup-battery",
251 .type = POWER_SUPPLY_TYPE_BATTERY,
252 .properties = collie_bat_bu_props,
253 .num_properties = ARRAY_SIZE(collie_bat_bu_props),
254 .get_property = collie_bat_get_property,
255 .external_power_changed = collie_bat_external_power_changed,
256 };
257
258 static struct collie_bat collie_bat_bu = {
259 .status = POWER_SUPPLY_STATUS_UNKNOWN,
260 .full_chrg = -1,
261 .psy = NULL,
262
263 .gpio_full = -1,
264 .gpio_charge_on = -1,
265
266 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
267
268 .gpio_bat = COLLIE_GPIO_BBAT_ON,
269 .adc_bat = UCB_ADC_INP_AD1,
270 .adc_bat_divider = 155,
271 .bat_max = 3000000,
272 .bat_min = 1900000,
273
274 .gpio_temp = -1,
275 .adc_temp = -1,
276 .adc_temp_divider = -1,
277 };
278
279 static struct gpio collie_batt_gpios[] = {
280 { COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
281 { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
282 { COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
283 { COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
284 { COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
285 { COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
286 };
287
288 #ifdef CONFIG_PM
289 static int wakeup_enabled;
290
collie_bat_suspend(struct ucb1x00_dev * dev)291 static int collie_bat_suspend(struct ucb1x00_dev *dev)
292 {
293 /* flush all pending status updates */
294 flush_work(&bat_work);
295
296 if (device_may_wakeup(&dev->ucb->dev) &&
297 collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
298 wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
299 else
300 wakeup_enabled = 0;
301
302 return 0;
303 }
304
collie_bat_resume(struct ucb1x00_dev * dev)305 static int collie_bat_resume(struct ucb1x00_dev *dev)
306 {
307 if (wakeup_enabled)
308 disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
309
310 /* things may have changed while we were away */
311 schedule_work(&bat_work);
312 return 0;
313 }
314 #else
315 #define collie_bat_suspend NULL
316 #define collie_bat_resume NULL
317 #endif
318
collie_bat_probe(struct ucb1x00_dev * dev)319 static int collie_bat_probe(struct ucb1x00_dev *dev)
320 {
321 int ret;
322 struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
323
324 if (!machine_is_collie())
325 return -ENODEV;
326
327 ucb = dev->ucb;
328
329 ret = gpio_request_array(collie_batt_gpios,
330 ARRAY_SIZE(collie_batt_gpios));
331 if (ret)
332 return ret;
333
334 mutex_init(&collie_bat_main.work_lock);
335
336 INIT_WORK(&bat_work, collie_bat_work);
337
338 psy_main_cfg.drv_data = &collie_bat_main;
339 collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
340 &collie_bat_main_desc,
341 &psy_main_cfg);
342 if (IS_ERR(collie_bat_main.psy)) {
343 ret = PTR_ERR(collie_bat_main.psy);
344 goto err_psy_reg_main;
345 }
346
347 psy_bu_cfg.drv_data = &collie_bat_bu;
348 collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
349 &collie_bat_bu_desc,
350 &psy_bu_cfg);
351 if (IS_ERR(collie_bat_bu.psy)) {
352 ret = PTR_ERR(collie_bat_bu.psy);
353 goto err_psy_reg_bu;
354 }
355
356 ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
357 collie_bat_gpio_isr,
358 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
359 "main full", &collie_bat_main);
360 if (ret)
361 goto err_irq;
362
363 device_init_wakeup(&ucb->dev, 1);
364 schedule_work(&bat_work);
365
366 return 0;
367
368 err_irq:
369 power_supply_unregister(collie_bat_bu.psy);
370 err_psy_reg_bu:
371 power_supply_unregister(collie_bat_main.psy);
372 err_psy_reg_main:
373
374 /* see comment in collie_bat_remove */
375 cancel_work_sync(&bat_work);
376 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
377 return ret;
378 }
379
collie_bat_remove(struct ucb1x00_dev * dev)380 static void collie_bat_remove(struct ucb1x00_dev *dev)
381 {
382 free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
383
384 power_supply_unregister(collie_bat_bu.psy);
385 power_supply_unregister(collie_bat_main.psy);
386
387 /*
388 * Now cancel the bat_work. We won't get any more schedules,
389 * since all sources (isr and external_power_changed) are
390 * unregistered now.
391 */
392 cancel_work_sync(&bat_work);
393 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
394 }
395
396 static struct ucb1x00_driver collie_bat_driver = {
397 .add = collie_bat_probe,
398 .remove = collie_bat_remove,
399 .suspend = collie_bat_suspend,
400 .resume = collie_bat_resume,
401 };
402
collie_bat_init(void)403 static int __init collie_bat_init(void)
404 {
405 return ucb1x00_register_driver(&collie_bat_driver);
406 }
407
collie_bat_exit(void)408 static void __exit collie_bat_exit(void)
409 {
410 ucb1x00_unregister_driver(&collie_bat_driver);
411 }
412
413 module_init(collie_bat_init);
414 module_exit(collie_bat_exit);
415
416 MODULE_LICENSE("GPL");
417 MODULE_AUTHOR("Thomas Kunze");
418 MODULE_DESCRIPTION("Collie battery driver");
419
