projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5c0e09e0 WY |
1 | /* |
| 2 | * Power supply driver for the Active-semi ACT8945A PMIC | |
| 3 | * | |
| 4 | * Copyright (C) 2015 Atmel Corporation | |
| 5 | * | |
| 6 | * Author: Wenyou Yang <wenyou.yang@atmel.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | * | |
| 12 | */ | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/of.h> | |
| 15 | #include <linux/of_gpio.h> | |
| 16 | #include <linux/platform_device.h> | |
| 17 | #include <linux/power_supply.h> | |
| 18 | #include <linux/regmap.h> | |
| 19 | ||
| 20 | static const char *act8945a_charger_model = "ACT8945A"; | |
| 21 | static const char *act8945a_charger_manufacturer = "Active-semi"; | |
| 22 | ||
| 23 | /** | |
| 24 | * ACT8945A Charger Register Map | |
| 25 | */ | |
| 26 | ||
| 27 | /* 0x70: Reserved */ | |
| 28 | #define ACT8945A_APCH_CFG 0x71 | |
| 29 | #define ACT8945A_APCH_STATUS 0x78 | |
| 30 | #define ACT8945A_APCH_CTRL 0x79 | |
| 31 | #define ACT8945A_APCH_STATE 0x7A | |
| 32 | ||
| 33 | /* ACT8945A_APCH_CFG */ | |
| 34 | #define APCH_CFG_OVPSET (0x3 << 0) | |
| 35 | #define APCH_CFG_OVPSET_6V6 (0x0 << 0) | |
| 36 | #define APCH_CFG_OVPSET_7V (0x1 << 0) | |
| 37 | #define APCH_CFG_OVPSET_7V5 (0x2 << 0) | |
| 38 | #define APCH_CFG_OVPSET_8V (0x3 << 0) | |
| 39 | #define APCH_CFG_PRETIMO (0x3 << 2) | |
| 40 | #define APCH_CFG_PRETIMO_40_MIN (0x0 << 2) | |
| 41 | #define APCH_CFG_PRETIMO_60_MIN (0x1 << 2) | |
| 42 | #define APCH_CFG_PRETIMO_80_MIN (0x2 << 2) | |
| 43 | #define APCH_CFG_PRETIMO_DISABLED (0x3 << 2) | |
| 44 | #define APCH_CFG_TOTTIMO (0x3 << 4) | |
| 45 | #define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4) | |
| 46 | #define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4) | |
| 47 | #define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4) | |
| 48 | #define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4) | |
| 49 | #define APCH_CFG_SUSCHG (0x1 << 7) | |
| 50 | ||
| 51 | #define APCH_STATUS_CHGDAT BIT(0) | |
| 52 | #define APCH_STATUS_INDAT BIT(1) | |
| 53 | #define APCH_STATUS_TEMPDAT BIT(2) | |
| 54 | #define APCH_STATUS_TIMRDAT BIT(3) | |
| 55 | #define APCH_STATUS_CHGSTAT BIT(4) | |
| 56 | #define APCH_STATUS_INSTAT BIT(5) | |
| 57 | #define APCH_STATUS_TEMPSTAT BIT(6) | |
| 58 | #define APCH_STATUS_TIMRSTAT BIT(7) | |
| 59 | ||
| 60 | #define APCH_CTRL_CHGEOCOUT BIT(0) | |
| 61 | #define APCH_CTRL_INDIS BIT(1) | |
| 62 | #define APCH_CTRL_TEMPOUT BIT(2) | |
| 63 | #define APCH_CTRL_TIMRPRE BIT(3) | |
| 64 | #define APCH_CTRL_CHGEOCIN BIT(4) | |
| 65 | #define APCH_CTRL_INCON BIT(5) | |
| 66 | #define APCH_CTRL_TEMPIN BIT(6) | |
| 67 | #define APCH_CTRL_TIMRTOT BIT(7) | |
| 68 | ||
| 69 | #define APCH_STATE_ACINSTAT (0x1 << 1) | |
| 70 | #define APCH_STATE_CSTATE (0x3 << 4) | |
| 71 | #define APCH_STATE_CSTATE_SHIFT 4 | |
| 72 | #define APCH_STATE_CSTATE_DISABLED 0x00 | |
| 73 | #define APCH_STATE_CSTATE_EOC 0x01 | |
| 74 | #define APCH_STATE_CSTATE_FAST 0x02 | |
| 75 | #define APCH_STATE_CSTATE_PRE 0x03 | |
| 76 | ||
| 77 | struct act8945a_charger { | |
| 78 | struct regmap *regmap; | |
| 79 | bool battery_temperature; | |
| 80 | }; | |
| 81 | ||
| 82 | static int act8945a_get_charger_state(struct regmap *regmap, int *val) | |
| 83 | { | |
| 84 | int ret; | |
| 85 | unsigned int status, state; | |
| 86 | ||
| 87 | ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); | |
| 88 | if (ret < 0) | |
| 89 | return ret; | |
| 90 | ||
| 91 | ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); | |
| 92 | if (ret < 0) | |
| 93 | return ret; | |
| 94 | ||
| 95 | state &= APCH_STATE_CSTATE; | |
| 96 | state >>= APCH_STATE_CSTATE_SHIFT; | |
| 97 | ||
| 98 | if (state == APCH_STATE_CSTATE_EOC) { | |
| 99 | if (status & APCH_STATUS_CHGDAT) | |
| 100 | *val = POWER_SUPPLY_STATUS_FULL; | |
| 101 | else | |
| 102 | *val = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
| 103 | } else if ((state == APCH_STATE_CSTATE_FAST) || | |
| 104 | (state == APCH_STATE_CSTATE_PRE)) { | |
| 105 | *val = POWER_SUPPLY_STATUS_CHARGING; | |
| 106 | } else { | |
| 107 | *val = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
| 108 | } | |
| 109 | ||
| 110 | return 0; | |
| 111 | } | |
| 112 | ||
| 113 | static int act8945a_get_charge_type(struct regmap *regmap, int *val) | |
| 114 | { | |
| 115 | int ret; | |
| 116 | unsigned int state; | |
| 117 | ||
| 118 | ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); | |
| 119 | if (ret < 0) | |
| 120 | return ret; | |
| 121 | ||
| 122 | state &= APCH_STATE_CSTATE; | |
| 123 | state >>= APCH_STATE_CSTATE_SHIFT; | |
| 124 | ||
| 125 | switch (state) { | |
| 126 | case APCH_STATE_CSTATE_PRE: | |
| 127 | *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
| 128 | break; | |
| 129 | case APCH_STATE_CSTATE_FAST: | |
| 130 | *val = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
| 131 | break; | |
| 132 | case APCH_STATE_CSTATE_EOC: | |
| 133 | case APCH_STATE_CSTATE_DISABLED: | |
| 134 | default: | |
| 135 | *val = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
| 136 | } | |
| 137 | ||
| 138 | return 0; | |
| 139 | } | |
| 140 | ||
| 141 | static int act8945a_get_battery_health(struct act8945a_charger *charger, | |
| 142 | struct regmap *regmap, int *val) | |
| 143 | { | |
| 144 | int ret; | |
| 145 | unsigned int status; | |
| 146 | ||
| 147 | ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); | |
| 148 | if (ret < 0) | |
| 149 | return ret; | |
| 150 | ||
| 151 | if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT)) | |
| 152 | *val = POWER_SUPPLY_HEALTH_OVERHEAT; | |
| 153 | else if (!(status & APCH_STATUS_INDAT)) | |
| 154 | *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
| 155 | else if (status & APCH_STATUS_TIMRDAT) | |
| 156 | *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
| 157 | else | |
| 158 | *val = POWER_SUPPLY_HEALTH_GOOD; | |
| 159 | ||
| 160 | return 0; | |
| 161 | } | |
| 162 | ||
| 163 | static enum power_supply_property act8945a_charger_props[] = { | |
| 164 | POWER_SUPPLY_PROP_STATUS, | |
| 165 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
| 166 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
| 167 | POWER_SUPPLY_PROP_HEALTH, | |
| 168 | POWER_SUPPLY_PROP_MODEL_NAME, | |
| 169 | POWER_SUPPLY_PROP_MANUFACTURER | |
| 170 | }; | |
| 171 | ||
| 172 | static int act8945a_charger_get_property(struct power_supply *psy, | |
| 173 | enum power_supply_property prop, | |
| 174 | union power_supply_propval *val) | |
| 175 | { | |
| 176 | struct act8945a_charger *charger = power_supply_get_drvdata(psy); | |
| 177 | struct regmap *regmap = charger->regmap; | |
| 178 | int ret = 0; | |
| 179 | ||
| 180 | switch (prop) { | |
| 181 | case POWER_SUPPLY_PROP_STATUS: | |
| 182 | ret = act8945a_get_charger_state(regmap, &val->intval); | |
| 183 | break; | |
| 184 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
| 185 | ret = act8945a_get_charge_type(regmap, &val->intval); | |
| 186 | break; | |
| 187 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
| 188 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
| 189 | break; | |
| 190 | case POWER_SUPPLY_PROP_HEALTH: | |
| 191 | ret = act8945a_get_battery_health(charger, | |
| 192 | regmap, &val->intval); | |
| 193 | break; | |
| 194 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
| 195 | val->strval = act8945a_charger_model; | |
| 196 | break; | |
| 197 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
| 198 | val->strval = act8945a_charger_manufacturer; | |
| 199 | break; | |
| 200 | default: | |
| 201 | return -EINVAL; | |
| 202 | } | |
| 203 | ||
| 204 | return ret; | |
| 205 | } | |
| 206 | ||
| 207 | static const struct power_supply_desc act8945a_charger_desc = { | |
| 208 | .name = "act8945a-charger", | |
| 209 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
| 210 | .get_property = act8945a_charger_get_property, | |
| 211 | .properties = act8945a_charger_props, | |
| 212 | .num_properties = ARRAY_SIZE(act8945a_charger_props), | |
| 213 | }; | |
| 214 | ||
| 215 | #define DEFAULT_TOTAL_TIME_OUT 3 | |
| 216 | #define DEFAULT_PRE_TIME_OUT 40 | |
| 217 | #define DEFAULT_INPUT_OVP_THRESHOLD 6600 | |
| 218 | ||
| 219 | static int act8945a_charger_config(struct device *dev, | |
| 220 | struct act8945a_charger *charger) | |
| 221 | { | |
| 222 | struct device_node *np = dev->of_node; | |
| 223 | enum of_gpio_flags flags; | |
| 224 | struct regmap *regmap = charger->regmap; | |
| 225 | ||
| 226 | u32 total_time_out; | |
| 227 | u32 pre_time_out; | |
| 228 | u32 input_voltage_threshold; | |
| 229 | int chglev_pin; | |
| 230 | ||
| 231 | unsigned int value = 0; | |
| 232 | ||
| 233 | if (!np) { | |
| 234 | dev_err(dev, "no charger of node\n"); | |
| 235 | return -EINVAL; | |
| 236 | } | |
| 237 | ||
| 238 | charger->battery_temperature = of_property_read_bool(np, | |
| 239 | "active-semi,check-battery-temperature"); | |
| 240 | ||
| 241 | chglev_pin = of_get_named_gpio_flags(np, | |
| 242 | "active-semi,chglev-gpios", 0, &flags); | |
| 243 | ||
| 244 | if (gpio_is_valid(chglev_pin)) { | |
| 245 | gpio_set_value(chglev_pin, | |
| 246 | ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1)); | |
| 247 | } | |
| 248 | ||
| 249 | if (of_property_read_u32(np, | |
| 250 | "active-semi,input-voltage-threshold-microvolt", | |
| 251 | &input_voltage_threshold)) | |
| 252 | input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD; | |
| 253 | ||
| 254 | if (of_property_read_u32(np, | |
| 255 | "active-semi,precondition-timeout", | |
| 256 | &pre_time_out)) | |
| 257 | pre_time_out = DEFAULT_PRE_TIME_OUT; | |
| 258 | ||
| 259 | if (of_property_read_u32(np, "active-semi,total-timeout", | |
| 260 | &total_time_out)) | |
| 261 | total_time_out = DEFAULT_TOTAL_TIME_OUT; | |
| 262 | ||
| 263 | switch (input_voltage_threshold) { | |
| 264 | case 8000: | |
| 265 | value |= APCH_CFG_OVPSET_8V; | |
| 266 | break; | |
| 267 | case 7500: | |
| 268 | value |= APCH_CFG_OVPSET_7V5; | |
| 269 | break; | |
| 270 | case 7000: | |
| 271 | value |= APCH_CFG_OVPSET_7V; | |
| 272 | break; | |
| 273 | case 6600: | |
| 274 | default: | |
| 275 | value |= APCH_CFG_OVPSET_6V6; | |
| 276 | break; | |
| 277 | } | |
| 278 | ||
| 279 | switch (pre_time_out) { | |
| 280 | case 60: | |
| 281 | value |= APCH_CFG_PRETIMO_60_MIN; | |
| 282 | break; | |
| 283 | case 80: | |
| 284 | value |= APCH_CFG_PRETIMO_80_MIN; | |
| 285 | break; | |
| 286 | case 0: | |
| 287 | value |= APCH_CFG_PRETIMO_DISABLED; | |
| 288 | break; | |
| 289 | case 40: | |
| 290 | default: | |
| 291 | value |= APCH_CFG_PRETIMO_40_MIN; | |
| 292 | break; | |
| 293 | } | |
| 294 | ||
| 295 | switch (total_time_out) { | |
| 296 | case 4: | |
| 297 | value |= APCH_CFG_TOTTIMO_4_HOUR; | |
| 298 | break; | |
| 299 | case 5: | |
| 300 | value |= APCH_CFG_TOTTIMO_5_HOUR; | |
| 301 | break; | |
| 302 | case 0: | |
| 303 | value |= APCH_CFG_TOTTIMO_DISABLED; | |
| 304 | break; | |
| 305 | case 3: | |
| 306 | default: | |
| 307 | value |= APCH_CFG_TOTTIMO_3_HOUR; | |
| 308 | break; | |
| 309 | } | |
| 310 | ||
| 311 | return regmap_write(regmap, ACT8945A_APCH_CFG, value); | |
| 312 | } | |
| 313 | ||
| 314 | static int act8945a_charger_probe(struct platform_device *pdev) | |
| 315 | { | |
| 316 | struct act8945a_charger *charger; | |
| 317 | struct power_supply *psy; | |
| 318 | struct power_supply_config psy_cfg = {}; | |
| 319 | int ret; | |
| 320 | ||
| 321 | charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); | |
| 322 | if (!charger) | |
| 323 | return -ENOMEM; | |
| 324 | ||
| 325 | charger->regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
| 326 | if (!charger->regmap) { | |
| 327 | dev_err(&pdev->dev, "Parent did not provide regmap\n"); | |
| 328 | return -EINVAL; | |
| 329 | } | |
| 330 | ||
| 331 | ret = act8945a_charger_config(pdev->dev.parent, charger); | |
| 332 | if (ret) | |
| 333 | return ret; | |
| 334 | ||
| 335 | psy_cfg.of_node = pdev->dev.parent->of_node; | |
| 336 | psy_cfg.drv_data = charger; | |
| 337 | ||
| 338 | psy = devm_power_supply_register(&pdev->dev, | |
| 339 | &act8945a_charger_desc, | |
| 340 | &psy_cfg); | |
| 341 | if (IS_ERR(psy)) { | |
| 342 | dev_err(&pdev->dev, "failed to register power supply\n"); | |
| 343 | return PTR_ERR(psy); | |
| 344 | } | |
| 345 | ||
| 346 | return 0; | |
| 347 | } | |
| 348 | ||
| 349 | static struct platform_driver act8945a_charger_driver = { | |
| 350 | .driver = { | |
| 351 | .name = "act8945a-charger", | |
| 352 | }, | |
| 353 | .probe = act8945a_charger_probe, | |
| 354 | }; | |
| 355 | module_platform_driver(act8945a_charger_driver); | |
| 356 | ||
| 357 | MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver"); | |
| 358 | MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); | |
| 359 | MODULE_LICENSE("GPL"); |