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authorLars-Peter Clausen <lars@metafoo.de>2010-06-19 00:08:29 -0400
committerRalf Baechle <ralf@linux-mips.org>2010-08-05 08:26:20 -0400
commitf6a21388bd255773cc80d4423afb4c69d4daa173 (patch)
tree4d331d997e84ca319c935383040d6ac409d7ea14 /drivers/power
parent7f983ba93d449972d5f372f12c6ad32d86ef30b4 (diff)
POWER: Add JZ4740 battery driver.
Add support for the battery voltage measurement part of the JZ4740 ADC unit. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Anton Vorontsov <cbouatmailru@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1416/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/Kconfig11
-rw-r--r--drivers/power/Makefile1
-rw-r--r--drivers/power/jz4740-battery.c445
3 files changed, 457 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 8e9ba177d817..1e5506be39b4 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -142,4 +142,15 @@ config CHARGER_PCF50633
142 help 142 help
143 Say Y to include support for NXP PCF50633 Main Battery Charger. 143 Say Y to include support for NXP PCF50633 Main Battery Charger.
144 144
145config BATTERY_JZ4740
146 tristate "Ingenic JZ4740 battery"
147 depends on MACH_JZ4740
148 depends on MFD_JZ4740_ADC
149 help
150 Say Y to enable support for the battery on Ingenic JZ4740 based
151 boards.
152
153 This driver can be build as a module. If so, the module will be
154 called jz4740-battery.
155
145endif # POWER_SUPPLY 156endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 00050809a6c7..cf95009d9bcd 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -34,3 +34,4 @@ obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
34obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o 34obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
35obj-$(CONFIG_BATTERY_Z2) += z2_battery.o 35obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
36obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o 36obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
37obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
new file mode 100644
index 000000000000..20c4b952e9bd
--- /dev/null
+++ b/drivers/power/jz4740-battery.c
@@ -0,0 +1,445 @@
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
23#include <linux/delay.h>
24#include <linux/gpio.h>
25#include <linux/mfd/core.h>
26#include <linux/power_supply.h>
27
28#include <linux/power/jz4740-battery.h>
29#include <linux/jz4740-adc.h>
30
31struct jz_battery {
32 struct jz_battery_platform_data *pdata;
33 struct platform_device *pdev;
34
35 struct resource *mem;
36 void __iomem *base;
37
38 int irq;
39 int charge_irq;
40
41 struct mfd_cell *cell;
42
43 int status;
44 long voltage;
45
46 struct completion read_completion;
47
48 struct power_supply battery;
49 struct delayed_work work;
50};
51
52static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
53{
54 return container_of(psy, struct jz_battery, battery);
55}
56
57static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
58{
59 struct jz_battery *battery = devid;
60
61 complete(&battery->read_completion);
62 return IRQ_HANDLED;
63}
64
65static long jz_battery_read_voltage(struct jz_battery *battery)
66{
67 unsigned long t;
68 unsigned long val;
69 long voltage;
70
71 INIT_COMPLETION(battery->read_completion);
72
73 enable_irq(battery->irq);
74 battery->cell->enable(battery->pdev);
75
76 t = wait_for_completion_interruptible_timeout(&battery->read_completion,
77 HZ);
78
79 if (t > 0) {
80 val = readw(battery->base) & 0xfff;
81
82 if (battery->pdata->info.voltage_max_design <= 2500000)
83 val = (val * 78125UL) >> 7UL;
84 else
85 val = ((val * 924375UL) >> 9UL) + 33000;
86 voltage = (long)val;
87 } else {
88 voltage = t ? t : -ETIMEDOUT;
89 }
90
91 battery->cell->disable(battery->pdev);
92 disable_irq(battery->irq);
93
94 return voltage;
95}
96
97static int jz_battery_get_capacity(struct power_supply *psy)
98{
99 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
100 struct power_supply_info *info = &jz_battery->pdata->info;
101 long voltage;
102 int ret;
103 int voltage_span;
104
105 voltage = jz_battery_read_voltage(jz_battery);
106
107 if (voltage < 0)
108 return voltage;
109
110 voltage_span = info->voltage_max_design - info->voltage_min_design;
111 ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
112
113 if (ret > 100)
114 ret = 100;
115 else if (ret < 0)
116 ret = 0;
117
118 return ret;
119}
120
121static int jz_battery_get_property(struct power_supply *psy,
122 enum power_supply_property psp, union power_supply_propval *val)
123{
124 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
125 struct power_supply_info *info = &jz_battery->pdata->info;
126 long voltage;
127
128 switch (psp) {
129 case POWER_SUPPLY_PROP_STATUS:
130 val->intval = jz_battery->status;
131 break;
132 case POWER_SUPPLY_PROP_TECHNOLOGY:
133 val->intval = jz_battery->pdata->info.technology;
134 break;
135 case POWER_SUPPLY_PROP_HEALTH:
136 voltage = jz_battery_read_voltage(jz_battery);
137 if (voltage < info->voltage_min_design)
138 val->intval = POWER_SUPPLY_HEALTH_DEAD;
139 else
140 val->intval = POWER_SUPPLY_HEALTH_GOOD;
141 break;
142 case POWER_SUPPLY_PROP_CAPACITY:
143 val->intval = jz_battery_get_capacity(psy);
144 break;
145 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
146 val->intval = jz_battery_read_voltage(jz_battery);
147 if (val->intval < 0)
148 return val->intval;
149 break;
150 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
151 val->intval = info->voltage_max_design;
152 break;
153 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
154 val->intval = info->voltage_min_design;
155 break;
156 case POWER_SUPPLY_PROP_PRESENT:
157 val->intval = 1;
158 break;
159 default:
160 return -EINVAL;
161 }
162 return 0;
163}
164
165static void jz_battery_external_power_changed(struct power_supply *psy)
166{
167 struct jz_battery *jz_battery = psy_to_jz_battery(psy);
168
169 cancel_delayed_work(&jz_battery->work);
170 schedule_delayed_work(&jz_battery->work, 0);
171}
172
173static irqreturn_t jz_battery_charge_irq(int irq, void *data)
174{
175 struct jz_battery *jz_battery = data;
176
177 cancel_delayed_work(&jz_battery->work);
178 schedule_delayed_work(&jz_battery->work, 0);
179
180 return IRQ_HANDLED;
181}
182
183static void jz_battery_update(struct jz_battery *jz_battery)
184{
185 int status;
186 long voltage;
187 bool has_changed = false;
188 int is_charging;
189
190 if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
191 is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
192 is_charging ^= jz_battery->pdata->gpio_charge_active_low;
193 if (is_charging)
194 status = POWER_SUPPLY_STATUS_CHARGING;
195 else
196 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
197
198 if (status != jz_battery->status) {
199 jz_battery->status = status;
200 has_changed = true;
201 }
202 }
203
204 voltage = jz_battery_read_voltage(jz_battery);
205 if (abs(voltage - jz_battery->voltage) < 50000) {
206 jz_battery->voltage = voltage;
207 has_changed = true;
208 }
209
210 if (has_changed)
211 power_supply_changed(&jz_battery->battery);
212}
213
214static enum power_supply_property jz_battery_properties[] = {
215 POWER_SUPPLY_PROP_STATUS,
216 POWER_SUPPLY_PROP_TECHNOLOGY,
217 POWER_SUPPLY_PROP_HEALTH,
218 POWER_SUPPLY_PROP_CAPACITY,
219 POWER_SUPPLY_PROP_VOLTAGE_NOW,
220 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
221 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
222 POWER_SUPPLY_PROP_PRESENT,
223};
224
225static void jz_battery_work(struct work_struct *work)
226{
227 /* Too small interval will increase system workload */
228 const int interval = HZ * 30;
229 struct jz_battery *jz_battery = container_of(work, struct jz_battery,
230 work.work);
231
232 jz_battery_update(jz_battery);
233 schedule_delayed_work(&jz_battery->work, interval);
234}
235
236static int __devinit jz_battery_probe(struct platform_device *pdev)
237{
238 int ret = 0;
239 struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
240 struct jz_battery *jz_battery;
241 struct power_supply *battery;
242
243 jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
244 if (!jz_battery) {
245 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
246 return -ENOMEM;
247 }
248
249 jz_battery->cell = pdev->dev.platform_data;
250
251 jz_battery->irq = platform_get_irq(pdev, 0);
252 if (jz_battery->irq < 0) {
253 ret = jz_battery->irq;
254 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
255 goto err_free;
256 }
257
258 jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
259 if (!jz_battery->mem) {
260 ret = -ENOENT;
261 dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
262 goto err_free;
263 }
264
265 jz_battery->mem = request_mem_region(jz_battery->mem->start,
266 resource_size(jz_battery->mem), pdev->name);
267 if (!jz_battery->mem) {
268 ret = -EBUSY;
269 dev_err(&pdev->dev, "Failed to request mmio memory region\n");
270 goto err_free;
271 }
272
273 jz_battery->base = ioremap_nocache(jz_battery->mem->start,
274 resource_size(jz_battery->mem));
275 if (!jz_battery->base) {
276 ret = -EBUSY;
277 dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
278 goto err_release_mem_region;
279 }
280
281 battery = &jz_battery->battery;
282 battery->name = pdata->info.name;
283 battery->type = POWER_SUPPLY_TYPE_BATTERY;
284 battery->properties = jz_battery_properties;
285 battery->num_properties = ARRAY_SIZE(jz_battery_properties);
286 battery->get_property = jz_battery_get_property;
287 battery->external_power_changed = jz_battery_external_power_changed;
288 battery->use_for_apm = 1;
289
290 jz_battery->pdata = pdata;
291 jz_battery->pdev = pdev;
292
293 init_completion(&jz_battery->read_completion);
294
295 INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
296
297 ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
298 jz_battery);
299 if (ret) {
300 dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
301 goto err_iounmap;
302 }
303 disable_irq(jz_battery->irq);
304
305 if (gpio_is_valid(pdata->gpio_charge)) {
306 ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
307 if (ret) {
308 dev_err(&pdev->dev, "charger state gpio request failed.\n");
309 goto err_free_irq;
310 }
311 ret = gpio_direction_input(pdata->gpio_charge);
312 if (ret) {
313 dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
314 goto err_free_gpio;
315 }
316
317 jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
318
319 if (jz_battery->charge_irq >= 0) {
320 ret = request_irq(jz_battery->charge_irq,
321 jz_battery_charge_irq,
322 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
323 dev_name(&pdev->dev), jz_battery);
324 if (ret) {
325 dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
326 goto err_free_gpio;
327 }
328 }
329 } else {
330 jz_battery->charge_irq = -1;
331 }
332
333 if (jz_battery->pdata->info.voltage_max_design <= 2500000)
334 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
335 JZ_ADC_CONFIG_BAT_MB);
336 else
337 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
338
339 ret = power_supply_register(&pdev->dev, &jz_battery->battery);
340 if (ret) {
341 dev_err(&pdev->dev, "power supply battery register failed.\n");
342 goto err_free_charge_irq;
343 }
344
345 platform_set_drvdata(pdev, jz_battery);
346 schedule_delayed_work(&jz_battery->work, 0);
347
348 return 0;
349
350err_free_charge_irq:
351 if (jz_battery->charge_irq >= 0)
352 free_irq(jz_battery->charge_irq, jz_battery);
353err_free_gpio:
354 if (gpio_is_valid(pdata->gpio_charge))
355 gpio_free(jz_battery->pdata->gpio_charge);
356err_free_irq:
357 free_irq(jz_battery->irq, jz_battery);
358err_iounmap:
359 platform_set_drvdata(pdev, NULL);
360 iounmap(jz_battery->base);
361err_release_mem_region:
362 release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
363err_free:
364 kfree(jz_battery);
365 return ret;
366}
367
368static int __devexit jz_battery_remove(struct platform_device *pdev)
369{
370 struct jz_battery *jz_battery = platform_get_drvdata(pdev);
371
372 cancel_delayed_work_sync(&jz_battery->work);
373
374 if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
375 if (jz_battery->charge_irq >= 0)
376 free_irq(jz_battery->charge_irq, jz_battery);
377 gpio_free(jz_battery->pdata->gpio_charge);
378 }
379
380 power_supply_unregister(&jz_battery->battery);
381
382 free_irq(jz_battery->irq, jz_battery);
383
384 iounmap(jz_battery->base);
385 release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
386
387 return 0;
388}
389
390#ifdef CONFIG_PM
391static int jz_battery_suspend(struct device *dev)
392{
393 struct jz_battery *jz_battery = dev_get_drvdata(dev);
394
395 cancel_delayed_work_sync(&jz_battery->work);
396 jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
397
398 return 0;
399}
400
401static int jz_battery_resume(struct device *dev)
402{
403 struct jz_battery *jz_battery = dev_get_drvdata(dev);
404
405 schedule_delayed_work(&jz_battery->work, 0);
406
407 return 0;
408}
409
410static const struct dev_pm_ops jz_battery_pm_ops = {
411 .suspend = jz_battery_suspend,
412 .resume = jz_battery_resume,
413};
414
415#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
416#else
417#define JZ_BATTERY_PM_OPS NULL
418#endif
419
420static struct platform_driver jz_battery_driver = {
421 .probe = jz_battery_probe,
422 .remove = __devexit_p(jz_battery_remove),
423 .driver = {
424 .name = "jz4740-battery",
425 .owner = THIS_MODULE,
426 .pm = JZ_BATTERY_PM_OPS,
427 },
428};
429
430static int __init jz_battery_init(void)
431{
432 return platform_driver_register(&jz_battery_driver);
433}
434module_init(jz_battery_init);
435
436static void __exit jz_battery_exit(void)
437{
438 platform_driver_unregister(&jz_battery_driver);
439}
440module_exit(jz_battery_exit);
441
442MODULE_ALIAS("platform:jz4740-battery");
443MODULE_LICENSE("GPL");
444MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
445MODULE_DESCRIPTION("JZ4740 SoC battery driver");