Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 1 | /* |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 2 | * iPAQ h1930/h1940/rx1950 battery controller driver |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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> |
Vasily Khoruzhick | 815efa1 | 2011-08-12 17:55:18 +0300 | [diff] [blame] | 23 | #include <linux/module.h> |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 24 | |
| 25 | #include <plat/adc.h> |
| 26 | |
| 27 | #define BAT_POLL_INTERVAL 10000 /* ms */ |
| 28 | #define JITTER_DELAY 500 /* ms */ |
| 29 | |
| 30 | struct 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 | |
| 42 | static struct delayed_work bat_work; |
| 43 | |
| 44 | static 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 | |
Heiko Stübner | 34aed73 | 2011-12-29 12:52:07 +0100 | [diff] [blame] | 50 | static 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 | |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 66 | static 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 | |
| 72 | static 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) { |
Heiko Stübner | 34aed73 | 2011-12-29 12:52:07 +0100 | [diff] [blame] | 86 | bat->volt_value = gather_samples(bat->client, |
| 87 | bat->pdata->backup_volt_samples, |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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 | |
| 108 | static 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 | |
| 119 | static 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 | |
| 128 | static int calc_full_volt(int volt_val, int cur_val, int impedance) |
| 129 | { |
| 130 | return volt_val + cur_val * impedance / 1000; |
| 131 | } |
| 132 | |
Vasily Khoruzhick | c66ae9b | 2010-12-13 12:26:21 +0200 | [diff] [blame] | 133 | static 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 | |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 140 | static 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) { |
Heiko Stübner | 34aed73 | 2011-12-29 12:52:07 +0100 | [diff] [blame] | 159 | bat->volt_value = gather_samples(bat->client, |
| 160 | bat->pdata->volt_samples, |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 161 | bat->pdata->volt_channel) * bat->pdata->volt_mult; |
Heiko Stübner | 34aed73 | 2011-12-29 12:52:07 +0100 | [diff] [blame] | 162 | bat->cur_value = gather_samples(bat->client, |
| 163 | bat->pdata->current_samples, |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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) || |
Vasily Khoruzhick | c66ae9b | 2010-12-13 12:26:21 +0200 | [diff] [blame] | 170 | !charge_finished(bat))) { |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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 | |
| 232 | static 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 | |
| 244 | static 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) { |
Vasily Khoruzhick | c66ae9b | 2010-12-13 12:26:21 +0200 | [diff] [blame] | 266 | is_charged = charge_finished(&main_bat); |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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 | |
| 282 | static 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 | |
Mark Brown | f704d45 | 2011-05-24 18:46:02 +0800 | [diff] [blame] | 289 | static int __devinit s3c_adc_bat_probe(struct platform_device *pdev) |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 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 | |
| 352 | err_platform: |
| 353 | if (pdata->gpio_charge_finished >= 0) |
| 354 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); |
| 355 | err_irq: |
| 356 | if (pdata->gpio_charge_finished >= 0) |
| 357 | gpio_free(pdata->gpio_charge_finished); |
| 358 | err_gpio: |
| 359 | if (pdata->backup_volt_mult) |
| 360 | power_supply_unregister(&backup_bat.psy); |
| 361 | err_reg_backup: |
| 362 | power_supply_unregister(&main_bat.psy); |
| 363 | err_reg_main: |
| 364 | return ret; |
| 365 | } |
| 366 | |
| 367 | static 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 |
| 392 | static 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 | |
| 410 | static 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 |
Heiko Stuebner | f8d878d | 2011-03-14 21:12:39 +0100 | [diff] [blame] | 429 | #define s3c_adc_bat_suspend NULL |
| 430 | #define s3c_adc_bat_resume NULL |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 431 | #endif |
| 432 | |
| 433 | static 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 | |
Axel Lin | 300bac7 | 2011-11-26 12:01:10 +0800 | [diff] [blame] | 443 | module_platform_driver(s3c_adc_bat_driver); |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 444 | |
| 445 | MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 446 | MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver"); |
Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame] | 447 | MODULE_LICENSE("GPL"); |