1 /* 2 * Battery power supply driver for X-Powers AXP20X and AXP22X PMICs 3 * 4 * Copyright 2016 Free Electrons NextThing Co. 5 * Quentin Schulz <quentin.schulz@free-electrons.com> 6 * 7 * This driver is based on a previous upstreaming attempt by: 8 * Bruno Prémont <bonbons@linux-vserver.org> 9 * 10 * This file is subject to the terms and conditions of the GNU General 11 * Public License. See the file "COPYING" in the main directory of this 12 * archive for more details. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20 #include <linux/err.h> 21 #include <linux/interrupt.h> 22 #include <linux/irq.h> 23 #include <linux/module.h> 24 #include <linux/of.h> 25 #include <linux/of_device.h> 26 #include <linux/platform_device.h> 27 #include <linux/power_supply.h> 28 #include <linux/regmap.h> 29 #include <linux/slab.h> 30 #include <linux/time.h> 31 #include <linux/iio/iio.h> 32 #include <linux/iio/consumer.h> 33 #include <linux/mfd/axp20x.h> 34 35 #define AXP20X_PWR_STATUS_BAT_CHARGING BIT(2) 36 37 #define AXP20X_PWR_OP_BATT_PRESENT BIT(5) 38 #define AXP20X_PWR_OP_BATT_ACTIVATED BIT(3) 39 40 #define AXP209_FG_PERCENT GENMASK(6, 0) 41 #define AXP22X_FG_VALID BIT(7) 42 43 #define AXP20X_CHRG_CTRL1_TGT_VOLT GENMASK(6, 5) 44 #define AXP20X_CHRG_CTRL1_TGT_4_1V (0 << 5) 45 #define AXP20X_CHRG_CTRL1_TGT_4_15V (1 << 5) 46 #define AXP20X_CHRG_CTRL1_TGT_4_2V (2 << 5) 47 #define AXP20X_CHRG_CTRL1_TGT_4_36V (3 << 5) 48 49 #define AXP22X_CHRG_CTRL1_TGT_4_22V (1 << 5) 50 #define AXP22X_CHRG_CTRL1_TGT_4_24V (3 << 5) 51 52 #define AXP20X_CHRG_CTRL1_TGT_CURR GENMASK(3, 0) 53 54 #define AXP20X_V_OFF_MASK GENMASK(2, 0) 55 56 struct axp20x_batt_ps { 57 struct regmap *regmap; 58 struct power_supply *batt; 59 struct device *dev; 60 struct iio_channel *batt_chrg_i; 61 struct iio_channel *batt_dischrg_i; 62 struct iio_channel *batt_v; 63 u8 axp_id; 64 }; 65 66 static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt, 67 int *val) 68 { 69 int ret, reg; 70 71 ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®); 72 if (ret) 73 return ret; 74 75 switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) { 76 case AXP20X_CHRG_CTRL1_TGT_4_1V: 77 *val = 4100000; 78 break; 79 case AXP20X_CHRG_CTRL1_TGT_4_15V: 80 *val = 4150000; 81 break; 82 case AXP20X_CHRG_CTRL1_TGT_4_2V: 83 *val = 4200000; 84 break; 85 case AXP20X_CHRG_CTRL1_TGT_4_36V: 86 *val = 4360000; 87 break; 88 default: 89 return -EINVAL; 90 } 91 92 return 0; 93 } 94 95 static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt, 96 int *val) 97 { 98 int ret, reg; 99 100 ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®); 101 if (ret) 102 return ret; 103 104 switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) { 105 case AXP20X_CHRG_CTRL1_TGT_4_1V: 106 *val = 4100000; 107 break; 108 case AXP20X_CHRG_CTRL1_TGT_4_2V: 109 *val = 4200000; 110 break; 111 case AXP22X_CHRG_CTRL1_TGT_4_22V: 112 *val = 4220000; 113 break; 114 case AXP22X_CHRG_CTRL1_TGT_4_24V: 115 *val = 4240000; 116 break; 117 default: 118 return -EINVAL; 119 } 120 121 return 0; 122 } 123 124 static void raw_to_constant_charge_current(struct axp20x_batt_ps *axp, int *val) 125 { 126 if (axp->axp_id == AXP209_ID) 127 *val = *val * 100000 + 300000; 128 else 129 *val = *val * 150000 + 300000; 130 } 131 132 static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp, 133 int *val) 134 { 135 int ret; 136 137 ret = regmap_read(axp->regmap, AXP20X_CHRG_CTRL1, val); 138 if (ret) 139 return ret; 140 141 *val &= AXP20X_CHRG_CTRL1_TGT_CURR; 142 143 raw_to_constant_charge_current(axp, val); 144 145 return 0; 146 } 147 148 static int axp20x_battery_get_prop(struct power_supply *psy, 149 enum power_supply_property psp, 150 union power_supply_propval *val) 151 { 152 struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy); 153 struct iio_channel *chan; 154 int ret = 0, reg, val1; 155 156 switch (psp) { 157 case POWER_SUPPLY_PROP_PRESENT: 158 case POWER_SUPPLY_PROP_ONLINE: 159 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE, 160 ®); 161 if (ret) 162 return ret; 163 164 val->intval = !!(reg & AXP20X_PWR_OP_BATT_PRESENT); 165 break; 166 167 case POWER_SUPPLY_PROP_STATUS: 168 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS, 169 ®); 170 if (ret) 171 return ret; 172 173 if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) { 174 val->intval = POWER_SUPPLY_STATUS_CHARGING; 175 return 0; 176 } 177 178 ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i, 179 &val1); 180 if (ret) 181 return ret; 182 183 if (val1) { 184 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 185 return 0; 186 } 187 188 ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &val1); 189 if (ret) 190 return ret; 191 192 /* 193 * Fuel Gauge data takes 7 bits but the stored value seems to be 194 * directly the raw percentage without any scaling to 7 bits. 195 */ 196 if ((val1 & AXP209_FG_PERCENT) == 100) 197 val->intval = POWER_SUPPLY_STATUS_FULL; 198 else 199 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 200 break; 201 202 case POWER_SUPPLY_PROP_HEALTH: 203 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE, 204 &val1); 205 if (ret) 206 return ret; 207 208 if (val1 & AXP20X_PWR_OP_BATT_ACTIVATED) { 209 val->intval = POWER_SUPPLY_HEALTH_DEAD; 210 return 0; 211 } 212 213 val->intval = POWER_SUPPLY_HEALTH_GOOD; 214 break; 215 216 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 217 ret = axp20x_get_constant_charge_current(axp20x_batt, 218 &val->intval); 219 if (ret) 220 return ret; 221 break; 222 223 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 224 val->intval = AXP20X_CHRG_CTRL1_TGT_CURR; 225 raw_to_constant_charge_current(axp20x_batt, &val->intval); 226 227 break; 228 229 case POWER_SUPPLY_PROP_CURRENT_NOW: 230 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS, 231 ®); 232 if (ret) 233 return ret; 234 235 if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) 236 chan = axp20x_batt->batt_chrg_i; 237 else 238 chan = axp20x_batt->batt_dischrg_i; 239 240 ret = iio_read_channel_processed(chan, &val->intval); 241 if (ret) 242 return ret; 243 244 /* IIO framework gives mA but Power Supply framework gives uA */ 245 val->intval *= 1000; 246 break; 247 248 case POWER_SUPPLY_PROP_CAPACITY: 249 /* When no battery is present, return capacity is 100% */ 250 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE, 251 ®); 252 if (ret) 253 return ret; 254 255 if (!(reg & AXP20X_PWR_OP_BATT_PRESENT)) { 256 val->intval = 100; 257 return 0; 258 } 259 260 ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, ®); 261 if (ret) 262 return ret; 263 264 if (axp20x_batt->axp_id == AXP221_ID && 265 !(reg & AXP22X_FG_VALID)) 266 return -EINVAL; 267 268 /* 269 * Fuel Gauge data takes 7 bits but the stored value seems to be 270 * directly the raw percentage without any scaling to 7 bits. 271 */ 272 val->intval = reg & AXP209_FG_PERCENT; 273 break; 274 275 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 276 if (axp20x_batt->axp_id == AXP209_ID) 277 return axp20x_battery_get_max_voltage(axp20x_batt, 278 &val->intval); 279 return axp22x_battery_get_max_voltage(axp20x_batt, 280 &val->intval); 281 282 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 283 ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, ®); 284 if (ret) 285 return ret; 286 287 val->intval = 2600000 + 100000 * (reg & AXP20X_V_OFF_MASK); 288 break; 289 290 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 291 ret = iio_read_channel_processed(axp20x_batt->batt_v, 292 &val->intval); 293 if (ret) 294 return ret; 295 296 /* IIO framework gives mV but Power Supply framework gives uV */ 297 val->intval *= 1000; 298 break; 299 300 default: 301 return -EINVAL; 302 } 303 304 return 0; 305 } 306 307 static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt, 308 int val) 309 { 310 switch (val) { 311 case 4100000: 312 val = AXP20X_CHRG_CTRL1_TGT_4_1V; 313 break; 314 315 case 4150000: 316 if (axp20x_batt->axp_id == AXP221_ID) 317 return -EINVAL; 318 319 val = AXP20X_CHRG_CTRL1_TGT_4_15V; 320 break; 321 322 case 4200000: 323 val = AXP20X_CHRG_CTRL1_TGT_4_2V; 324 break; 325 326 default: 327 /* 328 * AXP20x max voltage can be set to 4.36V and AXP22X max voltage 329 * can be set to 4.22V and 4.24V, but these voltages are too 330 * high for Lithium based batteries (AXP PMICs are supposed to 331 * be used with these kinds of battery). 332 */ 333 return -EINVAL; 334 } 335 336 return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, 337 AXP20X_CHRG_CTRL1_TGT_VOLT, val); 338 } 339 340 static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt, 341 int charge_current) 342 { 343 if (axp_batt->axp_id == AXP209_ID) 344 charge_current = (charge_current - 300000) / 100000; 345 else 346 charge_current = (charge_current - 300000) / 150000; 347 348 if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0) 349 return -EINVAL; 350 351 return regmap_update_bits(axp_batt->regmap, AXP20X_CHRG_CTRL1, 352 AXP20X_CHRG_CTRL1_TGT_CURR, charge_current); 353 } 354 355 static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt, 356 int min_voltage) 357 { 358 int val1 = (min_voltage - 2600000) / 100000; 359 360 if (val1 < 0 || val1 > AXP20X_V_OFF_MASK) 361 return -EINVAL; 362 363 return regmap_update_bits(axp_batt->regmap, AXP20X_V_OFF, 364 AXP20X_V_OFF_MASK, val1); 365 } 366 367 static int axp20x_battery_set_prop(struct power_supply *psy, 368 enum power_supply_property psp, 369 const union power_supply_propval *val) 370 { 371 struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy); 372 373 switch (psp) { 374 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 375 return axp20x_set_voltage_min_design(axp20x_batt, val->intval); 376 377 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 378 return axp20x_battery_set_max_voltage(axp20x_batt, val->intval); 379 380 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 381 return axp20x_set_constant_charge_current(axp20x_batt, 382 val->intval); 383 384 default: 385 return -EINVAL; 386 } 387 } 388 389 static enum power_supply_property axp20x_battery_props[] = { 390 POWER_SUPPLY_PROP_PRESENT, 391 POWER_SUPPLY_PROP_ONLINE, 392 POWER_SUPPLY_PROP_STATUS, 393 POWER_SUPPLY_PROP_VOLTAGE_NOW, 394 POWER_SUPPLY_PROP_CURRENT_NOW, 395 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 396 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 397 POWER_SUPPLY_PROP_HEALTH, 398 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 399 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 400 POWER_SUPPLY_PROP_CAPACITY, 401 }; 402 403 static int axp20x_battery_prop_writeable(struct power_supply *psy, 404 enum power_supply_property psp) 405 { 406 return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN || 407 psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN || 408 psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT; 409 } 410 411 static const struct power_supply_desc axp20x_batt_ps_desc = { 412 .name = "axp20x-battery", 413 .type = POWER_SUPPLY_TYPE_BATTERY, 414 .properties = axp20x_battery_props, 415 .num_properties = ARRAY_SIZE(axp20x_battery_props), 416 .property_is_writeable = axp20x_battery_prop_writeable, 417 .get_property = axp20x_battery_get_prop, 418 .set_property = axp20x_battery_set_prop, 419 }; 420 421 static const struct of_device_id axp20x_battery_ps_id[] = { 422 { 423 .compatible = "x-powers,axp209-battery-power-supply", 424 .data = (void *)AXP209_ID, 425 }, { 426 .compatible = "x-powers,axp221-battery-power-supply", 427 .data = (void *)AXP221_ID, 428 }, { /* sentinel */ }, 429 }; 430 MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id); 431 432 static int axp20x_power_probe(struct platform_device *pdev) 433 { 434 struct axp20x_batt_ps *axp20x_batt; 435 struct power_supply_config psy_cfg = {}; 436 437 if (!of_device_is_available(pdev->dev.of_node)) 438 return -ENODEV; 439 440 axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt), 441 GFP_KERNEL); 442 if (!axp20x_batt) 443 return -ENOMEM; 444 445 axp20x_batt->dev = &pdev->dev; 446 447 axp20x_batt->batt_v = devm_iio_channel_get(&pdev->dev, "batt_v"); 448 if (IS_ERR(axp20x_batt->batt_v)) { 449 if (PTR_ERR(axp20x_batt->batt_v) == -ENODEV) 450 return -EPROBE_DEFER; 451 return PTR_ERR(axp20x_batt->batt_v); 452 } 453 454 axp20x_batt->batt_chrg_i = devm_iio_channel_get(&pdev->dev, 455 "batt_chrg_i"); 456 if (IS_ERR(axp20x_batt->batt_chrg_i)) { 457 if (PTR_ERR(axp20x_batt->batt_chrg_i) == -ENODEV) 458 return -EPROBE_DEFER; 459 return PTR_ERR(axp20x_batt->batt_chrg_i); 460 } 461 462 axp20x_batt->batt_dischrg_i = devm_iio_channel_get(&pdev->dev, 463 "batt_dischrg_i"); 464 if (IS_ERR(axp20x_batt->batt_dischrg_i)) { 465 if (PTR_ERR(axp20x_batt->batt_dischrg_i) == -ENODEV) 466 return -EPROBE_DEFER; 467 return PTR_ERR(axp20x_batt->batt_dischrg_i); 468 } 469 470 axp20x_batt->regmap = dev_get_regmap(pdev->dev.parent, NULL); 471 platform_set_drvdata(pdev, axp20x_batt); 472 473 psy_cfg.drv_data = axp20x_batt; 474 psy_cfg.of_node = pdev->dev.of_node; 475 476 axp20x_batt->axp_id = (uintptr_t)of_device_get_match_data(&pdev->dev); 477 478 axp20x_batt->batt = devm_power_supply_register(&pdev->dev, 479 &axp20x_batt_ps_desc, 480 &psy_cfg); 481 if (IS_ERR(axp20x_batt->batt)) { 482 dev_err(&pdev->dev, "failed to register power supply: %ld\n", 483 PTR_ERR(axp20x_batt->batt)); 484 return PTR_ERR(axp20x_batt->batt); 485 } 486 487 return 0; 488 } 489 490 static struct platform_driver axp20x_batt_driver = { 491 .probe = axp20x_power_probe, 492 .driver = { 493 .name = "axp20x-battery-power-supply", 494 .of_match_table = axp20x_battery_ps_id, 495 }, 496 }; 497 498 module_platform_driver(axp20x_batt_driver); 499 500 MODULE_DESCRIPTION("Battery power supply driver for AXP20X and AXP22X PMICs"); 501 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); 502 MODULE_LICENSE("GPL"); 503