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; 149 unsigned int lut_size; 150 151 if (!bat) { 152 dev_err(psy->dev, "no battery infos ?!\n"); 153 return -EINVAL; 154 } 155 156 lut = bat->pdata->lut_noac; 157 lut_size = bat->pdata->lut_noac_cnt; 158 159 if (bat->volt_value < 0 || bat->cur_value < 0 || 160 jiffies_to_msecs(jiffies - bat->timestamp) > 161 BAT_POLL_INTERVAL) { 162 bat->volt_value = gather_samples(bat->client, 163 bat->pdata->volt_samples, 164 bat->pdata->volt_channel) * bat->pdata->volt_mult; 165 bat->cur_value = gather_samples(bat->client, 166 bat->pdata->current_samples, 167 bat->pdata->current_channel) * bat->pdata->current_mult; 168 bat->timestamp = jiffies; 169 } 170 171 if (bat->cable_plugged && 172 ((bat->pdata->gpio_charge_finished < 0) || 173 !charge_finished(bat))) { 174 lut = bat->pdata->lut_acin; 175 lut_size = bat->pdata->lut_acin_cnt; 176 } 177 178 new_level = 100000; 179 full_volt = calc_full_volt((bat->volt_value / 1000), 180 (bat->cur_value / 1000), bat->pdata->internal_impedance); 181 182 if (full_volt < calc_full_volt(lut->volt, lut->cur, 183 bat->pdata->internal_impedance)) { 184 lut_size--; 185 while (lut_size--) { 186 int lut_volt1; 187 int lut_volt2; 188 189 lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur, 190 bat->pdata->internal_impedance); 191 lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur, 192 bat->pdata->internal_impedance); 193 if (full_volt < lut_volt1 && full_volt >= lut_volt2) { 194 new_level = (lut[1].level + 195 (lut[0].level - lut[1].level) * 196 (full_volt - lut_volt2) / 197 (lut_volt1 - lut_volt2)) * 1000; 198 break; 199 } 200 new_level = lut[1].level * 1000; 201 lut++; 202 } 203 } 204 205 bat->level = new_level; 206 207 switch (psp) { 208 case POWER_SUPPLY_PROP_STATUS: 209 if (bat->pdata->gpio_charge_finished < 0) 210 val->intval = bat->level == 100000 ? 211 POWER_SUPPLY_STATUS_FULL : bat->status; 212 else 213 val->intval = bat->status; 214 return 0; 215 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 216 val->intval = 100000; 217 return 0; 218 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: 219 val->intval = 0; 220 return 0; 221 case POWER_SUPPLY_PROP_CHARGE_NOW: 222 val->intval = bat->level; 223 return 0; 224 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 225 val->intval = bat->volt_value; 226 return 0; 227 case POWER_SUPPLY_PROP_CURRENT_NOW: 228 val->intval = bat->cur_value; 229 return 0; 230 default: 231 return -EINVAL; 232 } 233} 234 235static struct s3c_adc_bat main_bat = { 236 .psy = { 237 .name = "main-battery", 238 .type = POWER_SUPPLY_TYPE_BATTERY, 239 .properties = s3c_adc_main_bat_props, 240 .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props), 241 .get_property = s3c_adc_bat_get_property, 242 .external_power_changed = s3c_adc_bat_ext_power_changed, 243 .use_for_apm = 1, 244 }, 245}; 246 247static void s3c_adc_bat_work(struct work_struct *work) 248{ 249 struct s3c_adc_bat *bat = &main_bat; 250 int is_charged; 251 int is_plugged; 252 static int was_plugged; 253 254 is_plugged = power_supply_am_i_supplied(&bat->psy); 255 bat->cable_plugged = is_plugged; 256 if (is_plugged != was_plugged) { 257 was_plugged = is_plugged; 258 if (is_plugged) { 259 if (bat->pdata->enable_charger) 260 bat->pdata->enable_charger(); 261 bat->status = POWER_SUPPLY_STATUS_CHARGING; 262 } else { 263 if (bat->pdata->disable_charger) 264 bat->pdata->disable_charger(); 265 bat->status = POWER_SUPPLY_STATUS_DISCHARGING; 266 } 267 } else { 268 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) { 269 is_charged = charge_finished(&main_bat); 270 if (is_charged) { 271 if (bat->pdata->disable_charger) 272 bat->pdata->disable_charger(); 273 bat->status = POWER_SUPPLY_STATUS_FULL; 274 } else { 275 if (bat->pdata->enable_charger) 276 bat->pdata->enable_charger(); 277 bat->status = POWER_SUPPLY_STATUS_CHARGING; 278 } 279 } 280 } 281 282 power_supply_changed(&bat->psy); 283} 284 285static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id) 286{ 287 schedule_delayed_work(&bat_work, 288 msecs_to_jiffies(JITTER_DELAY)); 289 return IRQ_HANDLED; 290} 291 292static int s3c_adc_bat_probe(struct platform_device *pdev) 293{ 294 struct s3c_adc_client *client; 295 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 296 int ret; 297 298 client = s3c_adc_register(pdev, NULL, NULL, 0); 299 if (IS_ERR(client)) { 300 dev_err(&pdev->dev, "cannot register adc\n"); 301 return PTR_ERR(client); 302 } 303 304 platform_set_drvdata(pdev, client); 305 306 main_bat.client = client; 307 main_bat.pdata = pdata; 308 main_bat.volt_value = -1; 309 main_bat.cur_value = -1; 310 main_bat.cable_plugged = 0; 311 main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING; 312 313 ret = power_supply_register(&pdev->dev, &main_bat.psy); 314 if (ret) 315 goto err_reg_main; 316 if (pdata->backup_volt_mult) { 317 backup_bat.client = client; 318 backup_bat.pdata = pdev->dev.platform_data; 319 backup_bat.volt_value = -1; 320 ret = power_supply_register(&pdev->dev, &backup_bat.psy); 321 if (ret) 322 goto err_reg_backup; 323 } 324 325 INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work); 326 327 if (pdata->gpio_charge_finished >= 0) { 328 ret = gpio_request(pdata->gpio_charge_finished, "charged"); 329 if (ret) 330 goto err_gpio; 331 332 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished), 333 s3c_adc_bat_charged, 334 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 335 "battery charged", NULL); 336 if (ret) 337 goto err_irq; 338 } 339 340 if (pdata->init) { 341 ret = pdata->init(); 342 if (ret) 343 goto err_platform; 344 } 345 346 dev_info(&pdev->dev, "successfully loaded\n"); 347 device_init_wakeup(&pdev->dev, 1); 348 349 /* Schedule timer to check current status */ 350 schedule_delayed_work(&bat_work, 351 msecs_to_jiffies(JITTER_DELAY)); 352 353 return 0; 354 355err_platform: 356 if (pdata->gpio_charge_finished >= 0) 357 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); 358err_irq: 359 if (pdata->gpio_charge_finished >= 0) 360 gpio_free(pdata->gpio_charge_finished); 361err_gpio: 362 if (pdata->backup_volt_mult) 363 power_supply_unregister(&backup_bat.psy); 364err_reg_backup: 365 power_supply_unregister(&main_bat.psy); 366err_reg_main: 367 return ret; 368} 369 370static int s3c_adc_bat_remove(struct platform_device *pdev) 371{ 372 struct s3c_adc_client *client = platform_get_drvdata(pdev); 373 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 374 375 power_supply_unregister(&main_bat.psy); 376 if (pdata->backup_volt_mult) 377 power_supply_unregister(&backup_bat.psy); 378 379 s3c_adc_release(client); 380 381 if (pdata->gpio_charge_finished >= 0) { 382 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); 383 gpio_free(pdata->gpio_charge_finished); 384 } 385 386 cancel_delayed_work(&bat_work); 387 388 if (pdata->exit) 389 pdata->exit(); 390 391 return 0; 392} 393 394#ifdef CONFIG_PM 395static int s3c_adc_bat_suspend(struct platform_device *pdev, 396 pm_message_t state) 397{ 398 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 399 400 if (pdata->gpio_charge_finished >= 0) { 401 if (device_may_wakeup(&pdev->dev)) 402 enable_irq_wake( 403 gpio_to_irq(pdata->gpio_charge_finished)); 404 else { 405 disable_irq(gpio_to_irq(pdata->gpio_charge_finished)); 406 main_bat.pdata->disable_charger(); 407 } 408 } 409 410 return 0; 411} 412 413static int s3c_adc_bat_resume(struct platform_device *pdev) 414{ 415 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; 416 417 if (pdata->gpio_charge_finished >= 0) { 418 if (device_may_wakeup(&pdev->dev)) 419 disable_irq_wake( 420 gpio_to_irq(pdata->gpio_charge_finished)); 421 else 422 enable_irq(gpio_to_irq(pdata->gpio_charge_finished)); 423 } 424 425 /* Schedule timer to check current status */ 426 schedule_delayed_work(&bat_work, 427 msecs_to_jiffies(JITTER_DELAY)); 428 429 return 0; 430} 431#else 432#define s3c_adc_bat_suspend NULL 433#define s3c_adc_bat_resume NULL 434#endif 435 436static struct platform_driver s3c_adc_bat_driver = { 437 .driver = { 438 .name = "s3c-adc-battery", 439 }, 440 .probe = s3c_adc_bat_probe, 441 .remove = s3c_adc_bat_remove, 442 .suspend = s3c_adc_bat_suspend, 443 .resume = s3c_adc_bat_resume, 444}; 445 446module_platform_driver(s3c_adc_bat_driver); 447 448MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); 449MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver"); 450MODULE_LICENSE("GPL"); 451