1/* 2 * iPAQ h1930/h1940/rx1950 battery controller driver 3 * Copyright (c) Vasily Khoruzhick 4 * Based on h1940_battery.c by Arnaud Patard 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive for 8 * more details. 9 * 10 */ 11 12#include <linux/interrupt.h> 13#include <linux/platform_device.h> 14#include <linux/power_supply.h> 15#include <linux/leds.h> 16#include <linux/gpio.h> 17#include <linux/err.h> 18#include <linux/timer.h> 19#include <linux/jiffies.h> 20#include <linux/s3c_adc_battery.h> 21#include <linux/errno.h> 22#include <linux/init.h> 23#include <linux/module.h> 24 25#include <plat/adc.h> 26 27#define BAT_POLL_INTERVAL 10000 /* ms */ 28#define JITTER_DELAY 500 /* ms */ 29 30struct s3c_adc_bat { 31 struct power_supply psy; 32 struct s3c_adc_client *client; 33 struct s3c_adc_bat_pdata *pdata; 34 int volt_value; 35 int cur_value; 36 unsigned int timestamp; 37 int level; 38 int status; 39 int cable_plugged:1; 40}; 41 42static struct delayed_work bat_work; 43 44static void s3c_adc_bat_ext_power_changed(struct power_supply *psy) 45{ 46 schedule_delayed_work(&bat_work, 47 msecs_to_jiffies(JITTER_DELAY)); 48} 49 50static int gather_samples(struct s3c_adc_client *client, int num, int channel) 51{ 52 int value, i; 53 54 /* default to 1 if nothing is set */ 55 if (num < 1) 56 num = 1; 57 58 value = 0; 59 for (i = 0; i < num; i++) 60 value += s3c_adc_read(client, channel); 61 value /= num; 62 63 return value; 64} 65 66static enum power_supply_property s3c_adc_backup_bat_props[] = { 67 POWER_SUPPLY_PROP_VOLTAGE_NOW, 68 POWER_SUPPLY_PROP_VOLTAGE_MIN, 69 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 70}; 71 72static int s3c_adc_backup_bat_get_property(struct power_supply *psy, 73 enum power_supply_property psp, 74 union power_supply_propval *val) 75{ 76 struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); 77 78 if (!bat) { 79 dev_err(psy->dev, "%s: no battery infos ?!\n", __func__); 80 return -EINVAL; 81 } 82 83 if (bat->volt_value < 0 || 84 jiffies_to_msecs(jiffies - bat->timestamp) > 85 BAT_POLL_INTERVAL) { 86 bat->volt_value = gather_samples(bat->client, 87 bat->pdata->backup_volt_samples, 88 bat->pdata->backup_volt_channel); 89 bat->volt_value *= bat->pdata->backup_volt_mult; 90 bat->timestamp = jiffies; 91 } 92 93 switch (psp) { 94 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 95 val->intval = bat->volt_value; 96 return 0; 97 case POWER_SUPPLY_PROP_VOLTAGE_MIN: 98 val->intval = bat->pdata->backup_volt_min; 99 return 0; 100 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 101 val->intval = bat->pdata->backup_volt_max; 102 return 0; 103 default: 104 return -EINVAL; 105 } 106} 107 108static struct s3c_adc_bat backup_bat = { 109 .psy = { 110 .name = "backup-battery", 111 .type = POWER_SUPPLY_TYPE_BATTERY, 112 .properties = s3c_adc_backup_bat_props, 113 .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props), 114 .get_property = s3c_adc_backup_bat_get_property, 115 .use_for_apm = 1, 116 }, 117}; 118 119static enum power_supply_property s3c_adc_main_bat_props[] = { 120 POWER_SUPPLY_PROP_STATUS, 121 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 122 POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, 123 POWER_SUPPLY_PROP_CHARGE_NOW, 124 POWER_SUPPLY_PROP_VOLTAGE_NOW, 125 POWER_SUPPLY_PROP_CURRENT_NOW, 126}; 127 128static int calc_full_volt(int volt_val, int cur_val, int impedance) 129{ 130 return volt_val + cur_val * impedance / 1000; 131} 132 133static int charge_finished(struct s3c_adc_bat *bat) 134{ 135 return bat->pdata->gpio_inverted ? 136 !gpio_get_value(bat->pdata->gpio_charge_finished) : 137 gpio_get_value(bat->pdata->gpio_charge_finished); 138} 139 140static int s3c_adc_bat_get_property(struct power_supply *psy, 141 enum power_supply_property psp, 142 union power_supply_propval *val) 143{ 144 struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); 145 146 int new_level; 147 int full_volt; 148 const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac; 149 unsigned int lut_size = bat->pdata->lut_noac_cnt; 150 151 if (!bat) { 152 dev_err(psy->dev, "no battery infos ?!\n"); 153 return -EINVAL; 154 } 155 156 if (bat->volt_value < 0 || bat->cur_value < 0 || 157 jiffies_to_msecs(jiffies - bat->timestamp) > 158 BAT_POLL_INTERVAL) { 159 bat->volt_value = gather_samples(bat->client, 160 bat->pdata->volt_samples, 161 bat->pdata->volt_channel) * bat->pdata->volt_mult; 162 bat->cur_value = gather_samples(bat->client, 163 bat->pdata->current_samples, 164 bat->pdata->current_channel) * bat->pdata->current_mult; 165 bat->timestamp = jiffies; 166 } 167 168 if (bat->cable_plugged && 169 ((bat->pdata->gpio_charge_finished < 0) || 170 !charge_finished(bat))) { 171 lut = bat->pdata->lut_acin; 172 lut_size = bat->pdata->lut_acin_cnt; 173 } 174 175 new_level = 100000; 176 full_volt = calc_full_volt((bat->volt_value / 1000), 177 (bat->cur_value / 1000), bat->pdata->internal_impedance); 178 179 if (full_volt < calc_full_volt(lut->volt, lut->cur, 180 bat->pdata->internal_impedance)) { 181 lut_size--; 182 while (lut_size--) { 183 int lut_volt1; 184 int lut_volt2; 185 186 lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur, 187 bat->pdata->internal_impedance); 188 lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur, 189 bat->pdata->internal_impedance); 190 if (full_volt < lut_volt1 && full_volt >= lut_volt2) { 191 new_level = (lut[1].level + 192 (lut[0].level - lut[1].level) * 193 (full_volt - lut_volt2) / 194 (lut_volt1 - lut_volt2)) * 1000; 195 break; 196 } 197 new_level = lut[1].level * 1000; 198 lut++; 199 } 200 } 201 202 bat->level = new_level; 203 204 switch (psp) { 205 case POWER_SUPPLY_PROP_STATUS: 206 if (bat->pdata->gpio_charge_finished < 0) 207 val->intval = bat->level == 100000 ? 208 POWER_SUPPLY_STATUS_FULL : bat->status; 209 else 210 val->intval = bat->status; 211 return 0; 212 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 213 val->intval = 100000; 214 return 0; 215 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: 216 val->intval = 0; 217 return 0; 218 case POWER_SUPPLY_PROP_CHARGE_NOW: 219 val->intval = bat->level; 220 return 0; 221 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 222 val->intval = bat->volt_value; 223 return 0; 224 case POWER_SUPPLY_PROP_CURRENT_NOW: 225 val->intval = bat->cur_value; 226 return 0; 227 default: 228 return -EINVAL; 229 } 230} 231 232static struct s3c_adc_bat main_bat = { 233 .psy = { 234 .name = "main-battery", 235 .type = POWER_SUPPLY_TYPE_BATTERY, 236 .properties = s3c_adc_main_bat_props, 237 .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props), 238 .get_property = s3c_adc_bat_get_property, 239 .external_power_changed = s3c_adc_bat_ext_power_changed, 240 .use_for_apm = 1, 241 }, 242}; 243 244static void s3c_adc_bat_work(struct work_struct *work) 245{ 246 struct s3c_adc_bat *bat = &main_bat; 247 int is_charged; 248 int is_plugged; 249 static int was_plugged; 250 251 is_plugged = power_supply_am_i_supplied(&bat->psy); 252 bat->cable_plugged = is_plugged; 253 if (is_plugged != was_plugged) { 254 was_plugged = is_plugged; 255 if (is_plugged) { 256 if (bat->pdata->enable_charger) 257 bat->pdata->enable_charger(); 258 bat->status = POWER_SUPPLY_STATUS_CHARGING; 259 } else { 260 if (bat->pdata->disable_charger) 261 bat->pdata->disable_charger(); 262 bat->status = POWER_SUPPLY_STATUS_DISCHARGING; 263 } 264 } else { 265 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) { 266 is_charged = charge_finished(&main_bat); 267 if (is_charged) { 268 if (bat->pdata->disable_charger) 269 bat->pdata->disable_charger(); 270 bat->status = POWER_SUPPLY_STATUS_FULL; 271 } else { 272 if (bat->pdata->enable_charger) 273 bat->pdata->enable_charger(); 274 bat->status = POWER_SUPPLY_STATUS_CHARGING; 275 } 276 } 277 } 278 279 power_supply_changed(&bat->psy); 280} 281 282static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id) 283{ 284 schedule_delayed_work(&bat_work, 285 msecs_to_jiffies(JITTER_DELAY)); 286 return IRQ_HANDLED; 287} 288 289static int __devinit s3c_adc_bat_probe(struct platform_device *pdev) 290{ 291 struct s3c_adc_client *client; 292 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 293 int ret; 294 295 client = s3c_adc_register(pdev, NULL, NULL, 0); 296 if (IS_ERR(client)) { 297 dev_err(&pdev->dev, "cannot register adc\n"); 298 return PTR_ERR(client); 299 } 300 301 platform_set_drvdata(pdev, client); 302 303 main_bat.client = client; 304 main_bat.pdata = pdata; 305 main_bat.volt_value = -1; 306 main_bat.cur_value = -1; 307 main_bat.cable_plugged = 0; 308 main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING; 309 310 ret = power_supply_register(&pdev->dev, &main_bat.psy); 311 if (ret) 312 goto err_reg_main; 313 if (pdata->backup_volt_mult) { 314 backup_bat.client = client; 315 backup_bat.pdata = pdev->dev.platform_data; 316 backup_bat.volt_value = -1; 317 ret = power_supply_register(&pdev->dev, &backup_bat.psy); 318 if (ret) 319 goto err_reg_backup; 320 } 321 322 INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work); 323 324 if (pdata->gpio_charge_finished >= 0) { 325 ret = gpio_request(pdata->gpio_charge_finished, "charged"); 326 if (ret) 327 goto err_gpio; 328 329 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished), 330 s3c_adc_bat_charged, 331 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 332 "battery charged", NULL); 333 if (ret) 334 goto err_irq; 335 } 336 337 if (pdata->init) { 338 ret = pdata->init(); 339 if (ret) 340 goto err_platform; 341 } 342 343 dev_info(&pdev->dev, "successfully loaded\n"); 344 device_init_wakeup(&pdev->dev, 1); 345 346 /* Schedule timer to check current status */ 347 schedule_delayed_work(&bat_work, 348 msecs_to_jiffies(JITTER_DELAY)); 349 350 return 0; 351 352err_platform: 353 if (pdata->gpio_charge_finished >= 0) 354 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); 355err_irq: 356 if (pdata->gpio_charge_finished >= 0) 357 gpio_free(pdata->gpio_charge_finished); 358err_gpio: 359 if (pdata->backup_volt_mult) 360 power_supply_unregister(&backup_bat.psy); 361err_reg_backup: 362 power_supply_unregister(&main_bat.psy); 363err_reg_main: 364 return ret; 365} 366 367static int s3c_adc_bat_remove(struct platform_device *pdev) 368{ 369 struct s3c_adc_client *client = platform_get_drvdata(pdev); 370 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 371 372 power_supply_unregister(&main_bat.psy); 373 if (pdata->backup_volt_mult) 374 power_supply_unregister(&backup_bat.psy); 375 376 s3c_adc_release(client); 377 378 if (pdata->gpio_charge_finished >= 0) { 379 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); 380 gpio_free(pdata->gpio_charge_finished); 381 } 382 383 cancel_delayed_work(&bat_work); 384 385 if (pdata->exit) 386 pdata->exit(); 387 388 return 0; 389} 390 391#ifdef CONFIG_PM 392static int s3c_adc_bat_suspend(struct platform_device *pdev, 393 pm_message_t state) 394{ 395 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 396 397 if (pdata->gpio_charge_finished >= 0) { 398 if (device_may_wakeup(&pdev->dev)) 399 enable_irq_wake( 400 gpio_to_irq(pdata->gpio_charge_finished)); 401 else { 402 disable_irq(gpio_to_irq(pdata->gpio_charge_finished)); 403 main_bat.pdata->disable_charger(); 404 } 405 } 406 407 return 0; 408} 409 410static int s3c_adc_bat_resume(struct platform_device *pdev) 411{ 412 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 413 414 if (pdata->gpio_charge_finished >= 0) { 415 if (device_may_wakeup(&pdev->dev)) 416 disable_irq_wake( 417 gpio_to_irq(pdata->gpio_charge_finished)); 418 else 419 enable_irq(gpio_to_irq(pdata->gpio_charge_finished)); 420 } 421 422 /* Schedule timer to check current status */ 423 schedule_delayed_work(&bat_work, 424 msecs_to_jiffies(JITTER_DELAY)); 425 426 return 0; 427} 428#else 429#define s3c_adc_bat_suspend NULL 430#define s3c_adc_bat_resume NULL 431#endif 432 433static struct platform_driver s3c_adc_bat_driver = { 434 .driver = { 435 .name = "s3c-adc-battery", 436 }, 437 .probe = s3c_adc_bat_probe, 438 .remove = s3c_adc_bat_remove, 439 .suspend = s3c_adc_bat_suspend, 440 .resume = s3c_adc_bat_resume, 441}; 442 443module_platform_driver(s3c_adc_bat_driver); 444 445MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); 446MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver"); 447MODULE_LICENSE("GPL"); 448