target/linux/xburst/patches-2.6.34/100-battery.patch

   1 From 83f97dcbcc93584a7d7930b6fe06562691bd865a Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sat, 24 Apr 2010 12:28:54 +0200
   4 Subject: [PATCH] Add jz4740 battery driver
   5
   6 ---
   7  drivers/power/Kconfig                |   11 +
   8  drivers/power/Makefile               |    1 +
   9  drivers/power/jz4740-battery.c       |  359 ++++++++++++++++++++++++++++++++++
  10  include/linux/power/jz4740-battery.h |   24 +++
  11  4 files changed, 395 insertions(+), 0 deletions(-)
  12  create mode 100644 drivers/power/jz4740-battery.c
  13  create mode 100644 include/linux/power/jz4740-battery.h
  14
  15 diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
  16 index faaa9b4..2f4e51f 100644
  17 --- a/drivers/power/Kconfig
  18 +++ b/drivers/power/Kconfig
  19 @@ -131,4 +131,15 @@ config CHARGER_PCF50633
  20         help
  21          Say Y to include support for NXP PCF50633 Main Battery Charger.
  22
  23 +config BATTERY_JZ4740
  24 +       tristate "Ingenic JZ4720/JZ4740 battery"
  25 +       depends on SOC_JZ4740
  26 +       depends on JZ4740_ADC
  27 +       help
  28 +         Say Y to enable support for the battery on Ingenic JZ4720/JZ4740 based
  29 +         boards.
  30 +
  31 +         This driver can be build as a module. If so, the module will be
  32 +         called jz4740-battery.
  33 +
  34  endif # POWER_SUPPLY
  35 diff --git a/drivers/power/Makefile b/drivers/power/Makefile
  36 index a2ba7c8..3b6b971 100644
  37 --- a/drivers/power/Makefile
  38 +++ b/drivers/power/Makefile
  39 @@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
  40  obj-$(CONFIG_BATTERY_DA9030)   += da9030_battery.o
  41  obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
  42  obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
  43 +obj-$(CONFIG_BATTERY_JZ4740)   += jz4740-battery.o
  44 diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
  45 new file mode 100644
  46 index 0000000..c89b9f7
  47 --- /dev/null
  48 +++ b/drivers/power/jz4740-battery.c
  49 @@ -0,0 +1,359 @@
  50 +/*
  51 + * Battery measurement code for Ingenic JZ SOC.
  52 + *
  53 + * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
  54 + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  55 + *
  56 + * based on tosa_battery.c
  57 + *
  58 + * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
  59 +*
  60 + * This program is free software; you can redistribute it and/or modify
  61 + * it under the terms of the GNU General Public License version 2 as
  62 + * published by the Free Software Foundation.
  63 + *
  64 + */
  65 +
  66 +#include <linux/interrupt.h>
  67 +#include <linux/kernel.h>
  68 +#include <linux/module.h>
  69 +#include <linux/platform_device.h>
  70 +#include <linux/slab.h>
  71 +#include <linux/spinlock.h>
  72 +
  73 +#include <linux/delay.h>
  74 +#include <linux/gpio.h>
  75 +#include <linux/power_supply.h>
  76 +
  77 +#include <linux/power/jz4740-battery.h>
  78 +#include <linux/jz4740-adc.h>
  79 +
  80 +struct jz_battery {
  81 +       struct jz_battery_platform_data *pdata;
  82 +
  83 +       int charge_irq;
  84 +
  85 +       int status;
  86 +       long voltage;
  87 +
  88 +       struct power_supply battery;
  89 +       struct delayed_work work;
  90 +};
  91 +
  92 +static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
  93 +{
  94 +       return container_of(psy, struct jz_battery, battery);
  95 +}
  96 +
  97 +static long jz_battery_read_voltage(struct jz_battery *jz_battery)
  98 +{
  99 +       struct device *adc = jz_battery->battery.dev->parent->parent;
 100 +       enum jz_adc_battery_scale scale;
 101 +
 102 +       if (jz_battery->pdata->info.voltage_max_design > 2500000)
 103 +               scale = JZ_ADC_BATTERY_SCALE_7V5;
 104 +       else
 105 +               scale = JZ_ADC_BATTERY_SCALE_2V5;
 106 +
 107 +       return jz4740_adc_read_battery_voltage(adc, scale);
 108 +}
 109 +
 110 +static int jz_battery_get_capacity(struct power_supply *psy)
 111 +{
 112 +       struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 113 +       struct power_supply_info *info = &jz_battery->pdata->info;
 114 +       long voltage;
 115 +       int ret;
 116 +       int voltage_span;
 117 +
 118 +       voltage = jz_battery_read_voltage(jz_battery);
 119 +
 120 +       if (voltage < 0)
 121 +               return voltage;
 122 +
 123 +       voltage_span = info->voltage_max_design - info->voltage_min_design;
 124 +       ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
 125 +
 126 +       if (ret > 100)
 127 +               ret = 100;
 128 +       else if (ret < 0)
 129 +               ret = 0;
 130 +
 131 +       return ret;
 132 +}
 133 +
 134 +static int jz_battery_get_property(struct power_supply *psy,
 135 +                               enum power_supply_property psp,
 136 +                               union power_supply_propval *val)
 137 +{
 138 +       struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 139 +       struct power_supply_info *info = &jz_battery->pdata->info;
 140 +       long voltage;
 141 +
 142 +       switch (psp) {
 143 +       case POWER_SUPPLY_PROP_STATUS:
 144 +               val->intval = jz_battery->status;
 145 +               break;
 146 +       case POWER_SUPPLY_PROP_TECHNOLOGY:
 147 +               val->intval = jz_battery->pdata->info.technology;
 148 +               break;
 149 +       case POWER_SUPPLY_PROP_HEALTH:
 150 +               voltage = jz_battery_read_voltage(jz_battery);
 151 +               if (voltage < info->voltage_min_design)
 152 +                       val->intval = POWER_SUPPLY_HEALTH_DEAD;
 153 +               else
 154 +                       val->intval = POWER_SUPPLY_HEALTH_GOOD;
 155 +               break;
 156 +       case POWER_SUPPLY_PROP_CAPACITY:
 157 +               val->intval = jz_battery_get_capacity(psy);
 158 +               break;
 159 +       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 160 +               val->intval = jz_battery_read_voltage(jz_battery);
 161 +               if (val->intval < 0)
 162 +                       return val->intval;
 163 +               break;
 164 +       case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 165 +               val->intval = info->voltage_max_design;
 166 +               break;
 167 +       case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 168 +               val->intval = info->voltage_min_design;
 169 +               break;
 170 +       case POWER_SUPPLY_PROP_PRESENT:
 171 +               val->intval = 1;
 172 +               break;
 173 +       default:
 174 +               return -EINVAL;
 175 +       }
 176 +       return 0;
 177 +}
 178 +
 179 +static void jz_battery_external_power_changed(struct power_supply *psy)
 180 +{
 181 +       struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 182 +
 183 +       cancel_delayed_work(&jz_battery->work);
 184 +       schedule_delayed_work(&jz_battery->work, 0);
 185 +}
 186 +
 187 +static irqreturn_t jz_battery_charge_irq(int irq, void *data)
 188 +{
 189 +       struct jz_battery *jz_battery = data;
 190 +
 191 +       cancel_delayed_work(&jz_battery->work);
 192 +       schedule_delayed_work(&jz_battery->work, 0);
 193 +
 194 +       return IRQ_HANDLED;
 195 +}
 196 +
 197 +static void jz_battery_update(struct jz_battery *jz_battery)
 198 +{
 199 +       int status;
 200 +       long voltage;
 201 +       long voltage_difference;
 202 +       bool has_changed = 0;
 203 +
 204 +       if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
 205 +               int is_charging;
 206 +
 207 +               is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
 208 +               is_charging ^= jz_battery->pdata->gpio_charge_active_low;
 209 +               if (is_charging)
 210 +                       status = POWER_SUPPLY_STATUS_CHARGING;
 211 +               else
 212 +                       status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 213 +
 214 +               if (status != jz_battery->status) {
 215 +                       jz_battery->status = status;
 216 +                       has_changed = 1;
 217 +               }
 218 +       }
 219 +
 220 +       voltage = jz_battery_read_voltage(jz_battery);
 221 +       voltage_difference = voltage - jz_battery->voltage;
 222 +       if (voltage_difference > 50000 || voltage_difference < 50000) {
 223 +               jz_battery->voltage = voltage;
 224 +               has_changed = 1;
 225 +       }
 226 +       if (has_changed)
 227 +               power_supply_changed(&jz_battery->battery);
 228 +}
 229 +
 230 +static enum power_supply_property jz_battery_properties[] = {
 231 +       POWER_SUPPLY_PROP_STATUS,
 232 +       POWER_SUPPLY_PROP_TECHNOLOGY,
 233 +       POWER_SUPPLY_PROP_HEALTH,
 234 +       POWER_SUPPLY_PROP_CAPACITY,
 235 +       POWER_SUPPLY_PROP_VOLTAGE_NOW,
 236 +       POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 237 +       POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 238 +       POWER_SUPPLY_PROP_PRESENT,
 239 +};
 240 +
 241 +static void jz_battery_work(struct work_struct *work)
 242 +{
 243 +       /* Too small interval will increase system workload */
 244 +       const int interval = HZ * 30;
 245 +       struct jz_battery *jz_battery = container_of(work, struct jz_battery,
 246 +                                           work.work);
 247 +
 248 +       jz_battery_update(jz_battery);
 249 +       schedule_delayed_work(&jz_battery->work, interval);
 250 +}
 251 +
 252 +static int __devinit jz_battery_probe(struct platform_device *pdev)
 253 +{
 254 +       int ret = 0;
 255 +       struct jz_battery_platform_data *pdata = pdev->dev.platform_data;
 256 +       struct jz_battery *jz_battery;
 257 +       struct power_supply *battery;
 258 +
 259 +       if (!pdev->dev.platform_data) {
 260 +               dev_err(&pdev->dev, "No platform data\n");
 261 +               return -EINVAL;
 262 +       }
 263 +
 264 +       jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
 265 +
 266 +       if (!jz_battery) {
 267 +               dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 268 +               return -ENOMEM;
 269 +       }
 270 +
 271 +       battery = &jz_battery->battery;
 272 +       battery->name = pdata->info.name;
 273 +       battery->type = POWER_SUPPLY_TYPE_BATTERY;
 274 +       battery->properties     = jz_battery_properties;
 275 +       battery->num_properties = ARRAY_SIZE(jz_battery_properties);
 276 +       battery->get_property = jz_battery_get_property;
 277 +       battery->external_power_changed = jz_battery_external_power_changed;
 278 +       battery->use_for_apm = 1;
 279 +
 280 +       jz_battery->pdata = pdata;
 281 +
 282 +       INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
 283 +
 284 +       if (gpio_is_valid(pdata->gpio_charge)) {
 285 +               ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
 286 +               if (ret) {
 287 +                       dev_err(&pdev->dev, "charger state gpio request failed.\n");
 288 +                       goto err_free;
 289 +               }
 290 +               ret = gpio_direction_input(pdata->gpio_charge);
 291 +               if (ret) {
 292 +                       dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
 293 +                       goto err_free_gpio;
 294 +               }
 295 +
 296 +               jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
 297 +
 298 +               if (jz_battery->charge_irq >= 0) {
 299 +                       ret = request_irq(jz_battery->charge_irq,
 300 +                                   jz_battery_charge_irq,
 301 +                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 302 +                                   dev_name(&pdev->dev), jz_battery);
 303 +                       if (ret) {
 304 +                               dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
 305 +                               goto err_free_gpio;
 306 +                       }
 307 +               }
 308 +       } else {
 309 +               jz_battery->charge_irq = -1;
 310 +       }
 311 +
 312 +
 313 +       ret = power_supply_register(&pdev->dev, &jz_battery->battery);
 314 +       if (ret) {
 315 +               dev_err(&pdev->dev, "power supply battery register failed.\n");
 316 +               goto err_free_irq;
 317 +       }
 318 +
 319 +       platform_set_drvdata(pdev, jz_battery);
 320 +       schedule_delayed_work(&jz_battery->work, 0);
 321 +
 322 +       return 0;
 323 +
 324 +err_free_irq:
 325 +       if (jz_battery->charge_irq >= 0)
 326 +               free_irq(jz_battery->charge_irq, jz_battery);
 327 +err_free_gpio:
 328 +       if (gpio_is_valid(pdata->gpio_charge))
 329 +               gpio_free(jz_battery->pdata->gpio_charge);
 330 +err_free:
 331 +       kfree(jz_battery);
 332 +       return ret;
 333 +}
 334 +
 335 +static int __devexit jz_battery_remove(struct platform_device *pdev)
 336 +{
 337 +       struct jz_battery *jz_battery = platform_get_drvdata(pdev);
 338 +
 339 +       cancel_delayed_work_sync(&jz_battery->work);
 340 +
 341 +       if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
 342 +               if (jz_battery->charge_irq >= 0)
 343 +                       free_irq(jz_battery->charge_irq, jz_battery);
 344 +               gpio_free(jz_battery->pdata->gpio_charge);
 345 +       }
 346 +
 347 +       power_supply_unregister(&jz_battery->battery);
 348 +
 349 +       return 0;
 350 +}
 351 +
 352 +#ifdef CONFIG_PM
 353 +static int jz_battery_suspend(struct device *dev)
 354 +{
 355 +       struct jz_battery *jz_battery = dev_get_drvdata(dev);
 356 +
 357 +       cancel_delayed_work_sync(&jz_battery->work);
 358 +       jz_battery->status =  POWER_SUPPLY_STATUS_UNKNOWN;
 359 +
 360 +       return 0;
 361 +}
 362 +
 363 +static int jz_battery_resume(struct device *dev)
 364 +{
 365 +       struct jz_battery *jz_battery = dev_get_drvdata(dev);
 366 +
 367 +       schedule_delayed_work(&jz_battery->work, 0);
 368 +
 369 +       return 0;
 370 +}
 371 +
 372 +static const struct dev_pm_ops jz_battery_pm_ops = {
 373 +       .suspend        = jz_battery_suspend,
 374 +       .resume         = jz_battery_resume,
 375 +};
 376 +
 377 +#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
 378 +
 379 +#else
 380 +#define JZ_BATTERY_PM_OPS NULL
 381 +#endif
 382 +
 383 +static struct platform_driver jz_battery_driver = {
 384 +       .probe          = jz_battery_probe,
 385 +       .remove         = __devexit_p(jz_battery_remove),
 386 +       .driver = {
 387 +               .name = "jz4740-battery",
 388 +               .owner = THIS_MODULE,
 389 +               .pm = JZ_BATTERY_PM_OPS,
 390 +       },
 391 +};
 392 +
 393 +static int __init jz_battery_init(void)
 394 +{
 395 +       return platform_driver_register(&jz_battery_driver);
 396 +}
 397 +module_init(jz_battery_init);
 398 +
 399 +static void __exit jz_battery_exit(void)
 400 +{
 401 +       platform_driver_unregister(&jz_battery_driver);
 402 +}
 403 +module_exit(jz_battery_exit);
 404 +
 405 +MODULE_ALIAS("platform:jz4740-battery");
 406 +MODULE_LICENSE("GPL");
 407 +MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
 408 +MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");
 409 diff --git a/include/linux/power/jz4740-battery.h b/include/linux/power/jz4740-battery.h
 410 new file mode 100644
 411 index 0000000..19c9610
 412 --- /dev/null
 413 +++ b/include/linux/power/jz4740-battery.h
 414 @@ -0,0 +1,24 @@
 415 +/*
 416 + *  Copyright (C) 2009, Jiejing Zhang <kzjeef@gmail.com>
 417 + *
 418 + *  This program is free software; you can redistribute         it and/or modify it
 419 + *  under  the terms of         the GNU General  Public License as published by the
 420 + *  Free Software Foundation;  either version 2 of the License, or (at your
 421 + *  option) any later version.
 422 + *
 423 + *  You should have received a copy of the  GNU General Public License along
 424 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
 425 + *  675 Mass Ave, Cambridge, MA 02139, USA.
 426 + *
 427 + */
 428 +
 429 +#ifndef __JZ4740_BATTERY_H
 430 +#define __JZ4740_BATTERY_H
 431 +
 432 +struct jz_battery_platform_data {
 433 +       struct power_supply_info info;
 434 +       int gpio_charge;        /* GPIO port of Charger state */
 435 +       int gpio_charge_active_low;
 436 +};
 437 +
 438 +#endif
 439 --
 440 1.5.6.5
 441