1 /*
2 * Battery measurement code for Ingenic JZ SOC.
3 *
4 * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
5 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * based on tosa_battery.c
8 *
9 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 */
16
17 #include <linux/interrupt.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
22 #include <linux/io.h>
23
24 #include <linux/delay.h>
25 #include <linux/err.h>
26 #include <linux/gpio.h>
27 #include <linux/mfd/core.h>
28 #include <linux/power_supply.h>
29
30 #include <linux/power/jz4740-battery.h>
31 #include <linux/jz4740-adc.h>
32
33 struct jz_battery {
34 struct jz_battery_platform_data *pdata;
35 struct platform_device *pdev;
36
37 void __iomem *base;
38
39 int irq;
40 int charge_irq;
41
42 const struct mfd_cell *cell;
43
44 int status;
45 long voltage;
46
47 struct completion read_completion;
48
49 struct power_supply battery;
50 struct delayed_work work;
51
52 struct mutex lock;
53 };
54
psy_to_jz_battery(struct power_supply * psy)55 static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
56 {
57 return container_of(psy, struct jz_battery, battery);
58 }
59
jz_battery_irq_handler(int irq,void * devid)60 static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
61 {
62 struct jz_battery *battery = devid;
63
64 complete(&battery->read_completion);
65 return IRQ_HANDLED;
66 }
67
jz_battery_read_voltage(struct jz_battery * battery)68 static long jz_battery_read_voltage(struct jz_battery *battery)
69 {
70 long t;
71 unsigned long val;
72 long voltage;
73
74 mutex_lock(&battery->lock);
75
76 reinit_completion(&battery->read_completion);
77
78 enable_irq(battery->irq);
79 battery->cell->enable(battery->pdev);
80
81 t = wait_for_completion_interruptible_timeout(&battery->read_completion,
82 HZ);
83
84 if (t > 0) {
85 val = readw(battery->base) & 0xfff;
86
87 if (battery->pdata->info.voltage_max_design <= 2500000)
88 val = (val * 78125UL) >> 7UL;
89 else
90 val = ((val * 924375UL) >> 9UL) + 33000;
91 voltage = (long)val;
92 } else {
93 voltage = t ? t : -ETIMEDOUT;
94 }
95
96 battery->cell->disable(battery->pdev);
97 disable_irq(battery->irq);
98
99 mutex_unlock(&battery->lock);
100
101 return voltage;
102 }
103
jz_battery_get_capacity(struct power_supply * psy)104 static int jz_battery_get_capacity(struct power_supply *psy)
105 {
106 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
107 struct power_supply_info *info = &jz_battery->pdata->info;
108 long voltage;
109 int ret;
110 int voltage_span;
111
112 voltage = jz_battery_read_voltage(jz_battery);
113
114 if (voltage < 0)
115 return voltage;
116
117 voltage_span = info->voltage_max_design - info->voltage_min_design;
118 ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
119
120 if (ret > 100)
121 ret = 100;
122 else if (ret < 0)
123 ret = 0;
124
125 return ret;
126 }
127
jz_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)128 static int jz_battery_get_property(struct power_supply *psy,
129 enum power_supply_property psp, union power_supply_propval *val)
130 {
131 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
132 struct power_supply_info *info = &jz_battery->pdata->info;
133 long voltage;
134
135 switch (psp) {
136 case POWER_SUPPLY_PROP_STATUS:
137 val->intval = jz_battery->status;
138 break;
139 case POWER_SUPPLY_PROP_TECHNOLOGY:
140 val->intval = jz_battery->pdata->info.technology;
141 break;
142 case POWER_SUPPLY_PROP_HEALTH:
143 voltage = jz_battery_read_voltage(jz_battery);
144 if (voltage < info->voltage_min_design)
145 val->intval = POWER_SUPPLY_HEALTH_DEAD;
146 else
147 val->intval = POWER_SUPPLY_HEALTH_GOOD;
148 break;
149 case POWER_SUPPLY_PROP_CAPACITY:
150 val->intval = jz_battery_get_capacity(psy);
151 break;
152 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
153 val->intval = jz_battery_read_voltage(jz_battery);
154 if (val->intval < 0)
155 return val->intval;
156 break;
157 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
158 val->intval = info->voltage_max_design;
159 break;
160 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
161 val->intval = info->voltage_min_design;
162 break;
163 case POWER_SUPPLY_PROP_PRESENT:
164 val->intval = 1;
165 break;
166 default:
167 return -EINVAL;
168 }
169 return 0;
170 }
171
jz_battery_external_power_changed(struct power_supply * psy)172 static void jz_battery_external_power_changed(struct power_supply *psy)
173 {
174 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
175
176 mod_delayed_work(system_wq, &jz_battery->work, 0);
177 }
178
jz_battery_charge_irq(int irq,void * data)179 static irqreturn_t jz_battery_charge_irq(int irq, void *data)
180 {
181 struct jz_battery *jz_battery = data;
182
183 mod_delayed_work(system_wq, &jz_battery->work, 0);
184
185 return IRQ_HANDLED;
186 }
187
jz_battery_update(struct jz_battery * jz_battery)188 static void jz_battery_update(struct jz_battery *jz_battery)
189 {
190 int status;
191 long voltage;
192 bool has_changed = false;
193 int is_charging;
194
195 if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
196 is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
197 is_charging ^= jz_battery->pdata->gpio_charge_active_low;
198 if (is_charging)
199 status = POWER_SUPPLY_STATUS_CHARGING;
200 else
201 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
202
203 if (status != jz_battery->status) {
204 jz_battery->status = status;
205 has_changed = true;
206 }
207 }
208
209 voltage = jz_battery_read_voltage(jz_battery);
210 if (abs(voltage - jz_battery->voltage) < 50000) {
211 jz_battery->voltage = voltage;
212 has_changed = true;
213 }
214
215 if (has_changed)
216 power_supply_changed(&jz_battery->battery);
217 }
218
219 static enum power_supply_property jz_battery_properties[] = {
220 POWER_SUPPLY_PROP_STATUS,
221 POWER_SUPPLY_PROP_TECHNOLOGY,
222 POWER_SUPPLY_PROP_HEALTH,
223 POWER_SUPPLY_PROP_CAPACITY,
224 POWER_SUPPLY_PROP_VOLTAGE_NOW,
225 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
226 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
227 POWER_SUPPLY_PROP_PRESENT,
228 };
229
jz_battery_work(struct work_struct * work)230 static void jz_battery_work(struct work_struct *work)
231 {
232 /* Too small interval will increase system workload */
233 const int interval = HZ * 30;
234 struct jz_battery *jz_battery = container_of(work, struct jz_battery,
235 work.work);
236
237 jz_battery_update(jz_battery);
238 schedule_delayed_work(&jz_battery->work, interval);
239 }
240
jz_battery_probe(struct platform_device * pdev)241 static int jz_battery_probe(struct platform_device *pdev)
242 {
243 int ret = 0;
244 struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
245 struct jz_battery *jz_battery;
246 struct power_supply *battery;
247 struct resource *mem;
248
249 if (!pdata) {
250 dev_err(&pdev->dev, "No platform_data supplied\n");
251 return -ENXIO;
252 }
253
254 jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
255 if (!jz_battery) {
256 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
257 return -ENOMEM;
258 }
259
260 jz_battery->cell = mfd_get_cell(pdev);
261
262 jz_battery->irq = platform_get_irq(pdev, 0);
263 if (jz_battery->irq < 0) {
264 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
265 return jz_battery->irq;
266 }
267
268 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
269
270 jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
271 if (IS_ERR(jz_battery->base))
272 return PTR_ERR(jz_battery->base);
273
274 battery = &jz_battery->battery;
275 battery->name = pdata->info.name;
276 battery->type = POWER_SUPPLY_TYPE_BATTERY;
277 battery->properties = jz_battery_properties;
278 battery->num_properties = ARRAY_SIZE(jz_battery_properties);
279 battery->get_property = jz_battery_get_property;
280 battery->external_power_changed = jz_battery_external_power_changed;
281 battery->use_for_apm = 1;
282
283 jz_battery->pdata = pdata;
284 jz_battery->pdev = pdev;
285
286 init_completion(&jz_battery->read_completion);
287 mutex_init(&jz_battery->lock);
288
289 INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
290
291 ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
292 jz_battery);
293 if (ret) {
294 dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
295 return ret;
296 }
297 disable_irq(jz_battery->irq);
298
299 if (gpio_is_valid(pdata->gpio_charge)) {
300 ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
301 if (ret) {
302 dev_err(&pdev->dev, "charger state gpio request failed.\n");
303 goto err_free_irq;
304 }
305 ret = gpio_direction_input(pdata->gpio_charge);
306 if (ret) {
307 dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
308 goto err_free_gpio;
309 }
310
311 jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
312
313 if (jz_battery->charge_irq >= 0) {
314 ret = request_irq(jz_battery->charge_irq,
315 jz_battery_charge_irq,
316 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
317 dev_name(&pdev->dev), jz_battery);
318 if (ret) {
319 dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
320 goto err_free_gpio;
321 }
322 }
323 } else {
324 jz_battery->charge_irq = -1;
325 }
326
327 if (jz_battery->pdata->info.voltage_max_design <= 2500000)
328 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
329 JZ_ADC_CONFIG_BAT_MB);
330 else
331 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
332
333 ret = power_supply_register(&pdev->dev, &jz_battery->battery);
334 if (ret) {
335 dev_err(&pdev->dev, "power supply battery register failed.\n");
336 goto err_free_charge_irq;
337 }
338
339 platform_set_drvdata(pdev, jz_battery);
340 schedule_delayed_work(&jz_battery->work, 0);
341
342 return 0;
343
344 err_free_charge_irq:
345 if (jz_battery->charge_irq >= 0)
346 free_irq(jz_battery->charge_irq, jz_battery);
347 err_free_gpio:
348 if (gpio_is_valid(pdata->gpio_charge))
349 gpio_free(jz_battery->pdata->gpio_charge);
350 err_free_irq:
351 free_irq(jz_battery->irq, jz_battery);
352 return ret;
353 }
354
jz_battery_remove(struct platform_device * pdev)355 static int jz_battery_remove(struct platform_device *pdev)
356 {
357 struct jz_battery *jz_battery = platform_get_drvdata(pdev);
358
359 cancel_delayed_work_sync(&jz_battery->work);
360
361 if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
362 if (jz_battery->charge_irq >= 0)
363 free_irq(jz_battery->charge_irq, jz_battery);
364 gpio_free(jz_battery->pdata->gpio_charge);
365 }
366
367 power_supply_unregister(&jz_battery->battery);
368
369 free_irq(jz_battery->irq, jz_battery);
370
371 return 0;
372 }
373
374 #ifdef CONFIG_PM
jz_battery_suspend(struct device * dev)375 static int jz_battery_suspend(struct device *dev)
376 {
377 struct jz_battery *jz_battery = dev_get_drvdata(dev);
378
379 cancel_delayed_work_sync(&jz_battery->work);
380 jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
381
382 return 0;
383 }
384
jz_battery_resume(struct device * dev)385 static int jz_battery_resume(struct device *dev)
386 {
387 struct jz_battery *jz_battery = dev_get_drvdata(dev);
388
389 schedule_delayed_work(&jz_battery->work, 0);
390
391 return 0;
392 }
393
394 static const struct dev_pm_ops jz_battery_pm_ops = {
395 .suspend = jz_battery_suspend,
396 .resume = jz_battery_resume,
397 };
398
399 #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
400 #else
401 #define JZ_BATTERY_PM_OPS NULL
402 #endif
403
404 static struct platform_driver jz_battery_driver = {
405 .probe = jz_battery_probe,
406 .remove = jz_battery_remove,
407 .driver = {
408 .name = "jz4740-battery",
409 .owner = THIS_MODULE,
410 .pm = JZ_BATTERY_PM_OPS,
411 },
412 };
413
414 module_platform_driver(jz_battery_driver);
415
416 MODULE_ALIAS("platform:jz4740-battery");
417 MODULE_LICENSE("GPL");
418 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
419 MODULE_DESCRIPTION("JZ4740 SoC battery driver");
420