Vasily Khoruzhick | 808be4b | 2010-07-17 13:57:03 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * iPAQ h1930/h1940/rx1950 battery controler 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 | |
| 24 | #include <plat/adc.h> |
| 25 | |
| 26 | #define BAT_POLL_INTERVAL 10000 /* ms */ |
| 27 | #define JITTER_DELAY 500 /* ms */ |
| 28 | |
| 29 | struct s3c_adc_bat { |
| 30 | struct power_supply psy; |
| 31 | struct s3c_adc_client *client; |
| 32 | struct s3c_adc_bat_pdata *pdata; |
| 33 | int volt_value; |
| 34 | int cur_value; |
| 35 | unsigned int timestamp; |
| 36 | int level; |
| 37 | int status; |
| 38 | int cable_plugged:1; |
| 39 | }; |
| 40 | |
| 41 | static struct delayed_work bat_work; |
| 42 | |
| 43 | static void s3c_adc_bat_ext_power_changed(struct power_supply *psy) |
| 44 | { |
| 45 | schedule_delayed_work(&bat_work, |
| 46 | msecs_to_jiffies(JITTER_DELAY)); |
| 47 | } |
| 48 | |
| 49 | static enum power_supply_property s3c_adc_backup_bat_props[] = { |
| 50 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 51 | POWER_SUPPLY_PROP_VOLTAGE_MIN, |
| 52 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
| 53 | }; |
| 54 | |
| 55 | static int s3c_adc_backup_bat_get_property(struct power_supply *psy, |
| 56 | enum power_supply_property psp, |
| 57 | union power_supply_propval *val) |
| 58 | { |
| 59 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); |
| 60 | |
| 61 | if (!bat) { |
| 62 | dev_err(psy->dev, "%s: no battery infos ?!\n", __func__); |
| 63 | return -EINVAL; |
| 64 | } |
| 65 | |
| 66 | if (bat->volt_value < 0 || |
| 67 | jiffies_to_msecs(jiffies - bat->timestamp) > |
| 68 | BAT_POLL_INTERVAL) { |
| 69 | bat->volt_value = s3c_adc_read(bat->client, |
| 70 | bat->pdata->backup_volt_channel); |
| 71 | bat->volt_value *= bat->pdata->backup_volt_mult; |
| 72 | bat->timestamp = jiffies; |
| 73 | } |
| 74 | |
| 75 | switch (psp) { |
| 76 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 77 | val->intval = bat->volt_value; |
| 78 | return 0; |
| 79 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: |
| 80 | val->intval = bat->pdata->backup_volt_min; |
| 81 | return 0; |
| 82 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
| 83 | val->intval = bat->pdata->backup_volt_max; |
| 84 | return 0; |
| 85 | default: |
| 86 | return -EINVAL; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static struct s3c_adc_bat backup_bat = { |
| 91 | .psy = { |
| 92 | .name = "backup-battery", |
| 93 | .type = POWER_SUPPLY_TYPE_BATTERY, |
| 94 | .properties = s3c_adc_backup_bat_props, |
| 95 | .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props), |
| 96 | .get_property = s3c_adc_backup_bat_get_property, |
| 97 | .use_for_apm = 1, |
| 98 | }, |
| 99 | }; |
| 100 | |
| 101 | static enum power_supply_property s3c_adc_main_bat_props[] = { |
| 102 | POWER_SUPPLY_PROP_STATUS, |
| 103 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, |
| 104 | POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, |
| 105 | POWER_SUPPLY_PROP_CHARGE_NOW, |
| 106 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 107 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 108 | }; |
| 109 | |
| 110 | static int calc_full_volt(int volt_val, int cur_val, int impedance) |
| 111 | { |
| 112 | return volt_val + cur_val * impedance / 1000; |
| 113 | } |
| 114 | |
| 115 | static int s3c_adc_bat_get_property(struct power_supply *psy, |
| 116 | enum power_supply_property psp, |
| 117 | union power_supply_propval *val) |
| 118 | { |
| 119 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); |
| 120 | |
| 121 | int new_level; |
| 122 | int full_volt; |
| 123 | const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac; |
| 124 | unsigned int lut_size = bat->pdata->lut_noac_cnt; |
| 125 | |
| 126 | if (!bat) { |
| 127 | dev_err(psy->dev, "no battery infos ?!\n"); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | |
| 131 | if (bat->volt_value < 0 || bat->cur_value < 0 || |
| 132 | jiffies_to_msecs(jiffies - bat->timestamp) > |
| 133 | BAT_POLL_INTERVAL) { |
| 134 | bat->volt_value = s3c_adc_read(bat->client, |
| 135 | bat->pdata->volt_channel) * bat->pdata->volt_mult; |
| 136 | bat->cur_value = s3c_adc_read(bat->client, |
| 137 | bat->pdata->current_channel) * bat->pdata->current_mult; |
| 138 | bat->timestamp = jiffies; |
| 139 | } |
| 140 | |
| 141 | if (bat->cable_plugged && |
| 142 | ((bat->pdata->gpio_charge_finished < 0) || |
| 143 | !gpio_get_value(bat->pdata->gpio_charge_finished))) { |
| 144 | lut = bat->pdata->lut_acin; |
| 145 | lut_size = bat->pdata->lut_acin_cnt; |
| 146 | } |
| 147 | |
| 148 | new_level = 100000; |
| 149 | full_volt = calc_full_volt((bat->volt_value / 1000), |
| 150 | (bat->cur_value / 1000), bat->pdata->internal_impedance); |
| 151 | |
| 152 | if (full_volt < calc_full_volt(lut->volt, lut->cur, |
| 153 | bat->pdata->internal_impedance)) { |
| 154 | lut_size--; |
| 155 | while (lut_size--) { |
| 156 | int lut_volt1; |
| 157 | int lut_volt2; |
| 158 | |
| 159 | lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur, |
| 160 | bat->pdata->internal_impedance); |
| 161 | lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur, |
| 162 | bat->pdata->internal_impedance); |
| 163 | if (full_volt < lut_volt1 && full_volt >= lut_volt2) { |
| 164 | new_level = (lut[1].level + |
| 165 | (lut[0].level - lut[1].level) * |
| 166 | (full_volt - lut_volt2) / |
| 167 | (lut_volt1 - lut_volt2)) * 1000; |
| 168 | break; |
| 169 | } |
| 170 | new_level = lut[1].level * 1000; |
| 171 | lut++; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | bat->level = new_level; |
| 176 | |
| 177 | switch (psp) { |
| 178 | case POWER_SUPPLY_PROP_STATUS: |
| 179 | if (bat->pdata->gpio_charge_finished < 0) |
| 180 | val->intval = bat->level == 100000 ? |
| 181 | POWER_SUPPLY_STATUS_FULL : bat->status; |
| 182 | else |
| 183 | val->intval = bat->status; |
| 184 | return 0; |
| 185 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: |
| 186 | val->intval = 100000; |
| 187 | return 0; |
| 188 | case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: |
| 189 | val->intval = 0; |
| 190 | return 0; |
| 191 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
| 192 | val->intval = bat->level; |
| 193 | return 0; |
| 194 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 195 | val->intval = bat->volt_value; |
| 196 | return 0; |
| 197 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 198 | val->intval = bat->cur_value; |
| 199 | return 0; |
| 200 | default: |
| 201 | return -EINVAL; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | static struct s3c_adc_bat main_bat = { |
| 206 | .psy = { |
| 207 | .name = "main-battery", |
| 208 | .type = POWER_SUPPLY_TYPE_BATTERY, |
| 209 | .properties = s3c_adc_main_bat_props, |
| 210 | .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props), |
| 211 | .get_property = s3c_adc_bat_get_property, |
| 212 | .external_power_changed = s3c_adc_bat_ext_power_changed, |
| 213 | .use_for_apm = 1, |
| 214 | }, |
| 215 | }; |
| 216 | |
| 217 | static void s3c_adc_bat_work(struct work_struct *work) |
| 218 | { |
| 219 | struct s3c_adc_bat *bat = &main_bat; |
| 220 | int is_charged; |
| 221 | int is_plugged; |
| 222 | static int was_plugged; |
| 223 | |
| 224 | is_plugged = power_supply_am_i_supplied(&bat->psy); |
| 225 | bat->cable_plugged = is_plugged; |
| 226 | if (is_plugged != was_plugged) { |
| 227 | was_plugged = is_plugged; |
| 228 | if (is_plugged) { |
| 229 | if (bat->pdata->enable_charger) |
| 230 | bat->pdata->enable_charger(); |
| 231 | bat->status = POWER_SUPPLY_STATUS_CHARGING; |
| 232 | } else { |
| 233 | if (bat->pdata->disable_charger) |
| 234 | bat->pdata->disable_charger(); |
| 235 | bat->status = POWER_SUPPLY_STATUS_DISCHARGING; |
| 236 | } |
| 237 | } else { |
| 238 | if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) { |
| 239 | is_charged = gpio_get_value( |
| 240 | main_bat.pdata->gpio_charge_finished); |
| 241 | if (is_charged) { |
| 242 | if (bat->pdata->disable_charger) |
| 243 | bat->pdata->disable_charger(); |
| 244 | bat->status = POWER_SUPPLY_STATUS_FULL; |
| 245 | } else { |
| 246 | if (bat->pdata->enable_charger) |
| 247 | bat->pdata->enable_charger(); |
| 248 | bat->status = POWER_SUPPLY_STATUS_CHARGING; |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | power_supply_changed(&bat->psy); |
| 254 | } |
| 255 | |
| 256 | static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id) |
| 257 | { |
| 258 | schedule_delayed_work(&bat_work, |
| 259 | msecs_to_jiffies(JITTER_DELAY)); |
| 260 | return IRQ_HANDLED; |
| 261 | } |
| 262 | |
| 263 | static int __init s3c_adc_bat_probe(struct platform_device *pdev) |
| 264 | { |
| 265 | struct s3c_adc_client *client; |
| 266 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; |
| 267 | int ret; |
| 268 | |
| 269 | client = s3c_adc_register(pdev, NULL, NULL, 0); |
| 270 | if (IS_ERR(client)) { |
| 271 | dev_err(&pdev->dev, "cannot register adc\n"); |
| 272 | return PTR_ERR(client); |
| 273 | } |
| 274 | |
| 275 | platform_set_drvdata(pdev, client); |
| 276 | |
| 277 | main_bat.client = client; |
| 278 | main_bat.pdata = pdata; |
| 279 | main_bat.volt_value = -1; |
| 280 | main_bat.cur_value = -1; |
| 281 | main_bat.cable_plugged = 0; |
| 282 | main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING; |
| 283 | |
| 284 | ret = power_supply_register(&pdev->dev, &main_bat.psy); |
| 285 | if (ret) |
| 286 | goto err_reg_main; |
| 287 | if (pdata->backup_volt_mult) { |
| 288 | backup_bat.client = client; |
| 289 | backup_bat.pdata = pdev->dev.platform_data; |
| 290 | backup_bat.volt_value = -1; |
| 291 | ret = power_supply_register(&pdev->dev, &backup_bat.psy); |
| 292 | if (ret) |
| 293 | goto err_reg_backup; |
| 294 | } |
| 295 | |
| 296 | INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work); |
| 297 | |
| 298 | if (pdata->gpio_charge_finished >= 0) { |
| 299 | ret = gpio_request(pdata->gpio_charge_finished, "charged"); |
| 300 | if (ret) |
| 301 | goto err_gpio; |
| 302 | |
| 303 | ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished), |
| 304 | s3c_adc_bat_charged, |
| 305 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
| 306 | "battery charged", NULL); |
| 307 | if (ret) |
| 308 | goto err_irq; |
| 309 | } |
| 310 | |
| 311 | if (pdata->init) { |
| 312 | ret = pdata->init(); |
| 313 | if (ret) |
| 314 | goto err_platform; |
| 315 | } |
| 316 | |
| 317 | dev_info(&pdev->dev, "successfully loaded\n"); |
| 318 | device_init_wakeup(&pdev->dev, 1); |
| 319 | |
| 320 | /* Schedule timer to check current status */ |
| 321 | schedule_delayed_work(&bat_work, |
| 322 | msecs_to_jiffies(JITTER_DELAY)); |
| 323 | |
| 324 | return 0; |
| 325 | |
| 326 | err_platform: |
| 327 | if (pdata->gpio_charge_finished >= 0) |
| 328 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); |
| 329 | err_irq: |
| 330 | if (pdata->gpio_charge_finished >= 0) |
| 331 | gpio_free(pdata->gpio_charge_finished); |
| 332 | err_gpio: |
| 333 | if (pdata->backup_volt_mult) |
| 334 | power_supply_unregister(&backup_bat.psy); |
| 335 | err_reg_backup: |
| 336 | power_supply_unregister(&main_bat.psy); |
| 337 | err_reg_main: |
| 338 | return ret; |
| 339 | } |
| 340 | |
| 341 | static int s3c_adc_bat_remove(struct platform_device *pdev) |
| 342 | { |
| 343 | struct s3c_adc_client *client = platform_get_drvdata(pdev); |
| 344 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; |
| 345 | |
| 346 | power_supply_unregister(&main_bat.psy); |
| 347 | if (pdata->backup_volt_mult) |
| 348 | power_supply_unregister(&backup_bat.psy); |
| 349 | |
| 350 | s3c_adc_release(client); |
| 351 | |
| 352 | if (pdata->gpio_charge_finished >= 0) { |
| 353 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); |
| 354 | gpio_free(pdata->gpio_charge_finished); |
| 355 | } |
| 356 | |
| 357 | cancel_delayed_work(&bat_work); |
| 358 | |
| 359 | if (pdata->exit) |
| 360 | pdata->exit(); |
| 361 | |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | #ifdef CONFIG_PM |
| 366 | static int s3c_adc_bat_suspend(struct platform_device *pdev, |
| 367 | pm_message_t state) |
| 368 | { |
| 369 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; |
| 370 | |
| 371 | if (pdata->gpio_charge_finished >= 0) { |
| 372 | if (device_may_wakeup(&pdev->dev)) |
| 373 | enable_irq_wake( |
| 374 | gpio_to_irq(pdata->gpio_charge_finished)); |
| 375 | else { |
| 376 | disable_irq(gpio_to_irq(pdata->gpio_charge_finished)); |
| 377 | main_bat.pdata->disable_charger(); |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int s3c_adc_bat_resume(struct platform_device *pdev) |
| 385 | { |
| 386 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; |
| 387 | |
| 388 | if (pdata->gpio_charge_finished >= 0) { |
| 389 | if (device_may_wakeup(&pdev->dev)) |
| 390 | disable_irq_wake( |
| 391 | gpio_to_irq(pdata->gpio_charge_finished)); |
| 392 | else |
| 393 | enable_irq(gpio_to_irq(pdata->gpio_charge_finished)); |
| 394 | } |
| 395 | |
| 396 | /* Schedule timer to check current status */ |
| 397 | schedule_delayed_work(&bat_work, |
| 398 | msecs_to_jiffies(JITTER_DELAY)); |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | #else |
| 403 | #define s3c_adc_battery_suspend NULL |
| 404 | #define s3c_adc_battery_resume NULL |
| 405 | #endif |
| 406 | |
| 407 | static struct platform_driver s3c_adc_bat_driver = { |
| 408 | .driver = { |
| 409 | .name = "s3c-adc-battery", |
| 410 | }, |
| 411 | .probe = s3c_adc_bat_probe, |
| 412 | .remove = s3c_adc_bat_remove, |
| 413 | .suspend = s3c_adc_bat_suspend, |
| 414 | .resume = s3c_adc_bat_resume, |
| 415 | }; |
| 416 | |
| 417 | static int __init s3c_adc_bat_init(void) |
| 418 | { |
| 419 | return platform_driver_register(&s3c_adc_bat_driver); |
| 420 | } |
| 421 | module_init(s3c_adc_bat_init); |
| 422 | |
| 423 | static void __exit s3c_adc_bat_exit(void) |
| 424 | { |
| 425 | platform_driver_unregister(&s3c_adc_bat_driver); |
| 426 | } |
| 427 | module_exit(s3c_adc_bat_exit); |
| 428 | |
| 429 | MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); |
| 430 | MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controler driver"); |
| 431 | MODULE_LICENSE("GPL"); |