MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Fuel gauge driver for Maxim 17042 / 8966 / 8997 |
| 3 | * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. |
| 4 | * |
| 5 | * Copyright (C) 2011 Samsung Electronics |
| 6 | * MyungJoo Ham <myungjoo.ham@samsung.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 as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | * This driver is based on max17040_battery.c |
| 23 | */ |
| 24 | |
| 25 | #include <linux/init.h> |
Paul Gortmaker | 7e6d62d | 2011-07-03 15:28:29 -0400 | [diff] [blame] | 26 | #include <linux/module.h> |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/i2c.h> |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 29 | #include <linux/delay.h> |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 30 | #include <linux/mod_devicetable.h> |
| 31 | #include <linux/power_supply.h> |
| 32 | #include <linux/power/max17042_battery.h> |
| 33 | |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 34 | /* Status register bits */ |
| 35 | #define STATUS_POR_BIT (1 << 1) |
| 36 | #define STATUS_BST_BIT (1 << 3) |
| 37 | #define STATUS_VMN_BIT (1 << 8) |
| 38 | #define STATUS_TMN_BIT (1 << 9) |
| 39 | #define STATUS_SMN_BIT (1 << 10) |
| 40 | #define STATUS_BI_BIT (1 << 11) |
| 41 | #define STATUS_VMX_BIT (1 << 12) |
| 42 | #define STATUS_TMX_BIT (1 << 13) |
| 43 | #define STATUS_SMX_BIT (1 << 14) |
| 44 | #define STATUS_BR_BIT (1 << 15) |
| 45 | |
| 46 | #define VFSOC0_LOCK 0x0000 |
| 47 | #define VFSOC0_UNLOCK 0x0080 |
| 48 | #define MODEL_UNLOCK1 0X0059 |
| 49 | #define MODEL_UNLOCK2 0X00C4 |
| 50 | #define MODEL_LOCK1 0X0000 |
| 51 | #define MODEL_LOCK2 0X0000 |
| 52 | |
| 53 | #define dQ_ACC_DIV 0x4 |
| 54 | #define dP_ACC_100 0x1900 |
| 55 | #define dP_ACC_200 0x3200 |
| 56 | |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 57 | struct max17042_chip { |
| 58 | struct i2c_client *client; |
| 59 | struct power_supply battery; |
| 60 | struct max17042_platform_data *pdata; |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 61 | struct work_struct work; |
| 62 | int init_complete; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value) |
| 66 | { |
| 67 | int ret = i2c_smbus_write_word_data(client, reg, value); |
| 68 | |
| 69 | if (ret < 0) |
| 70 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| 71 | |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | static int max17042_read_reg(struct i2c_client *client, u8 reg) |
| 76 | { |
| 77 | int ret = i2c_smbus_read_word_data(client, reg); |
| 78 | |
| 79 | if (ret < 0) |
| 80 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| 81 | |
| 82 | return ret; |
| 83 | } |
| 84 | |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 85 | static void max17042_set_reg(struct i2c_client *client, |
| 86 | struct max17042_reg_data *data, int size) |
| 87 | { |
| 88 | int i; |
| 89 | |
| 90 | for (i = 0; i < size; i++) |
| 91 | max17042_write_reg(client, data[i].addr, data[i].data); |
| 92 | } |
| 93 | |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 94 | static enum power_supply_property max17042_battery_props[] = { |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 95 | POWER_SUPPLY_PROP_PRESENT, |
| 96 | POWER_SUPPLY_PROP_CYCLE_COUNT, |
| 97 | POWER_SUPPLY_PROP_VOLTAGE_MAX, |
| 98 | POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 99 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 100 | POWER_SUPPLY_PROP_VOLTAGE_AVG, |
| 101 | POWER_SUPPLY_PROP_CAPACITY, |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 102 | POWER_SUPPLY_PROP_CHARGE_FULL, |
| 103 | POWER_SUPPLY_PROP_TEMP, |
| 104 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 105 | POWER_SUPPLY_PROP_CURRENT_AVG, |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 106 | }; |
| 107 | |
| 108 | static int max17042_get_property(struct power_supply *psy, |
| 109 | enum power_supply_property psp, |
| 110 | union power_supply_propval *val) |
| 111 | { |
| 112 | struct max17042_chip *chip = container_of(psy, |
| 113 | struct max17042_chip, battery); |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 114 | int ret; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 115 | |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 116 | if (!chip->init_complete) |
| 117 | return -EAGAIN; |
| 118 | |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 119 | switch (psp) { |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 120 | case POWER_SUPPLY_PROP_PRESENT: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 121 | ret = max17042_read_reg(chip->client, MAX17042_STATUS); |
| 122 | if (ret < 0) |
| 123 | return ret; |
| 124 | |
| 125 | if (ret & MAX17042_STATUS_BattAbsent) |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 126 | val->intval = 0; |
| 127 | else |
| 128 | val->intval = 1; |
| 129 | break; |
| 130 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 131 | ret = max17042_read_reg(chip->client, MAX17042_Cycles); |
| 132 | if (ret < 0) |
| 133 | return ret; |
| 134 | |
| 135 | val->intval = ret; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 136 | break; |
| 137 | case POWER_SUPPLY_PROP_VOLTAGE_MAX: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 138 | ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt); |
| 139 | if (ret < 0) |
| 140 | return ret; |
| 141 | |
| 142 | val->intval = ret >> 8; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 143 | val->intval *= 20000; /* Units of LSB = 20mV */ |
| 144 | break; |
| 145 | case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 146 | ret = max17042_read_reg(chip->client, MAX17042_V_empty); |
| 147 | if (ret < 0) |
| 148 | return ret; |
| 149 | |
| 150 | val->intval = ret >> 7; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 151 | val->intval *= 10000; /* Units of LSB = 10mV */ |
| 152 | break; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 153 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 154 | ret = max17042_read_reg(chip->client, MAX17042_VCELL); |
| 155 | if (ret < 0) |
| 156 | return ret; |
| 157 | |
| 158 | val->intval = ret * 625 / 8; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 159 | break; |
| 160 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 161 | ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL); |
| 162 | if (ret < 0) |
| 163 | return ret; |
| 164 | |
| 165 | val->intval = ret * 625 / 8; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 166 | break; |
| 167 | case POWER_SUPPLY_PROP_CAPACITY: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 168 | ret = max17042_read_reg(chip->client, MAX17042_SOC); |
| 169 | if (ret < 0) |
| 170 | return ret; |
| 171 | |
| 172 | val->intval = ret >> 8; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 173 | break; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 174 | case POWER_SUPPLY_PROP_CHARGE_FULL: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 175 | ret = max17042_read_reg(chip->client, MAX17042_RepSOC); |
| 176 | if (ret < 0) |
| 177 | return ret; |
| 178 | |
| 179 | if ((ret >> 8) >= MAX17042_BATTERY_FULL) |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 180 | val->intval = 1; |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 181 | else if (ret >= 0) |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 182 | val->intval = 0; |
| 183 | break; |
| 184 | case POWER_SUPPLY_PROP_TEMP: |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 185 | ret = max17042_read_reg(chip->client, MAX17042_TEMP); |
| 186 | if (ret < 0) |
| 187 | return ret; |
| 188 | |
| 189 | val->intval = ret; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 190 | /* The value is signed. */ |
| 191 | if (val->intval & 0x8000) { |
| 192 | val->intval = (0x7fff & ~val->intval) + 1; |
| 193 | val->intval *= -1; |
| 194 | } |
| 195 | /* The value is converted into deci-centigrade scale */ |
| 196 | /* Units of LSB = 1 / 256 degree Celsius */ |
| 197 | val->intval = val->intval * 10 / 256; |
| 198 | break; |
| 199 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 200 | if (chip->pdata->enable_current_sense) { |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 201 | ret = max17042_read_reg(chip->client, MAX17042_Current); |
| 202 | if (ret < 0) |
| 203 | return ret; |
| 204 | |
| 205 | val->intval = ret; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 206 | if (val->intval & 0x8000) { |
| 207 | /* Negative */ |
| 208 | val->intval = ~val->intval & 0x7fff; |
| 209 | val->intval++; |
| 210 | val->intval *= -1; |
| 211 | } |
Philip Rakity | 91d8b0d | 2011-08-12 21:19:57 -0700 | [diff] [blame] | 212 | val->intval *= 1562500 / chip->pdata->r_sns; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 213 | } else { |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | break; |
| 217 | case POWER_SUPPLY_PROP_CURRENT_AVG: |
| 218 | if (chip->pdata->enable_current_sense) { |
Ramakrishna Pallala | 60a1f6e | 2011-11-26 04:11:15 +0400 | [diff] [blame] | 219 | ret = max17042_read_reg(chip->client, |
| 220 | MAX17042_AvgCurrent); |
| 221 | if (ret < 0) |
| 222 | return ret; |
| 223 | |
| 224 | val->intval = ret; |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 225 | if (val->intval & 0x8000) { |
| 226 | /* Negative */ |
| 227 | val->intval = ~val->intval & 0x7fff; |
| 228 | val->intval++; |
| 229 | val->intval *= -1; |
| 230 | } |
| 231 | val->intval *= 1562500 / chip->pdata->r_sns; |
| 232 | } else { |
| 233 | return -EINVAL; |
| 234 | } |
| 235 | break; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 236 | default: |
| 237 | return -EINVAL; |
| 238 | } |
| 239 | return 0; |
| 240 | } |
| 241 | |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 242 | static int max17042_write_verify_reg(struct i2c_client *client, |
| 243 | u8 reg, u16 value) |
| 244 | { |
| 245 | int retries = 8; |
| 246 | int ret; |
| 247 | u16 read_value; |
| 248 | |
| 249 | do { |
| 250 | ret = i2c_smbus_write_word_data(client, reg, value); |
| 251 | read_value = max17042_read_reg(client, reg); |
| 252 | if (read_value != value) { |
| 253 | ret = -EIO; |
| 254 | retries--; |
| 255 | } |
| 256 | } while (retries && read_value != value); |
| 257 | |
| 258 | if (ret < 0) |
| 259 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static inline void max17042_override_por( |
| 265 | struct i2c_client *client, u8 reg, u16 value) |
| 266 | { |
| 267 | if (value) |
| 268 | max17042_write_reg(client, reg, value); |
| 269 | } |
| 270 | |
| 271 | static inline void max10742_unlock_model(struct max17042_chip *chip) |
| 272 | { |
| 273 | struct i2c_client *client = chip->client; |
| 274 | max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1); |
| 275 | max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2); |
| 276 | } |
| 277 | |
| 278 | static inline void max10742_lock_model(struct max17042_chip *chip) |
| 279 | { |
| 280 | struct i2c_client *client = chip->client; |
| 281 | max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1); |
| 282 | max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2); |
| 283 | } |
| 284 | |
| 285 | static inline void max17042_write_model_data(struct max17042_chip *chip, |
| 286 | u8 addr, int size) |
| 287 | { |
| 288 | struct i2c_client *client = chip->client; |
| 289 | int i; |
| 290 | for (i = 0; i < size; i++) |
| 291 | max17042_write_reg(client, addr + i, |
| 292 | chip->pdata->config_data->cell_char_tbl[i]); |
| 293 | } |
| 294 | |
| 295 | static inline void max17042_read_model_data(struct max17042_chip *chip, |
| 296 | u8 addr, u16 *data, int size) |
| 297 | { |
| 298 | struct i2c_client *client = chip->client; |
| 299 | int i; |
| 300 | |
| 301 | for (i = 0; i < size; i++) |
| 302 | data[i] = max17042_read_reg(client, addr + i); |
| 303 | } |
| 304 | |
| 305 | static inline int max17042_model_data_compare(struct max17042_chip *chip, |
| 306 | u16 *data1, u16 *data2, int size) |
| 307 | { |
| 308 | int i; |
| 309 | |
| 310 | if (memcmp(data1, data2, size)) { |
| 311 | dev_err(&chip->client->dev, "%s compare failed\n", __func__); |
| 312 | for (i = 0; i < size; i++) |
| 313 | dev_info(&chip->client->dev, "0x%x, 0x%x", |
| 314 | data1[i], data2[i]); |
| 315 | dev_info(&chip->client->dev, "\n"); |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | static int max17042_init_model(struct max17042_chip *chip) |
| 322 | { |
| 323 | int ret; |
| 324 | int table_size = |
| 325 | sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16); |
| 326 | u16 *temp_data; |
| 327 | |
| 328 | temp_data = kzalloc(table_size, GFP_KERNEL); |
| 329 | if (!temp_data) |
| 330 | return -ENOMEM; |
| 331 | |
| 332 | max10742_unlock_model(chip); |
| 333 | max17042_write_model_data(chip, MAX17042_MODELChrTbl, |
| 334 | table_size); |
| 335 | max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, |
| 336 | table_size); |
| 337 | |
| 338 | ret = max17042_model_data_compare( |
| 339 | chip, |
| 340 | chip->pdata->config_data->cell_char_tbl, |
| 341 | temp_data, |
| 342 | table_size); |
| 343 | |
| 344 | max10742_lock_model(chip); |
| 345 | kfree(temp_data); |
| 346 | |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | static int max17042_verify_model_lock(struct max17042_chip *chip) |
| 351 | { |
| 352 | int i; |
| 353 | int table_size = |
| 354 | sizeof(chip->pdata->config_data->cell_char_tbl); |
| 355 | u16 *temp_data; |
| 356 | int ret = 0; |
| 357 | |
| 358 | temp_data = kzalloc(table_size, GFP_KERNEL); |
| 359 | if (!temp_data) |
| 360 | return -ENOMEM; |
| 361 | |
| 362 | max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, |
| 363 | table_size); |
| 364 | for (i = 0; i < table_size; i++) |
| 365 | if (temp_data[i]) |
| 366 | ret = -EINVAL; |
| 367 | |
| 368 | kfree(temp_data); |
| 369 | return ret; |
| 370 | } |
| 371 | |
| 372 | static void max17042_write_config_regs(struct max17042_chip *chip) |
| 373 | { |
| 374 | struct max17042_config_data *config = chip->pdata->config_data; |
| 375 | |
| 376 | max17042_write_reg(chip->client, MAX17042_CONFIG, config->config); |
| 377 | max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg); |
| 378 | max17042_write_reg(chip->client, MAX17042_FilterCFG, |
| 379 | config->filter_cfg); |
| 380 | max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg); |
| 381 | } |
| 382 | |
| 383 | static void max17042_write_custom_regs(struct max17042_chip *chip) |
| 384 | { |
| 385 | struct max17042_config_data *config = chip->pdata->config_data; |
| 386 | |
| 387 | max17042_write_verify_reg(chip->client, MAX17042_RCOMP0, |
| 388 | config->rcomp0); |
| 389 | max17042_write_verify_reg(chip->client, MAX17042_TempCo, |
| 390 | config->tcompc0); |
| 391 | max17042_write_reg(chip->client, MAX17042_EmptyTempCo, |
| 392 | config->empty_tempco); |
| 393 | max17042_write_verify_reg(chip->client, MAX17042_K_empty0, |
| 394 | config->kempty0); |
| 395 | max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm, |
| 396 | config->ichgt_term); |
| 397 | } |
| 398 | |
| 399 | static void max17042_update_capacity_regs(struct max17042_chip *chip) |
| 400 | { |
| 401 | struct max17042_config_data *config = chip->pdata->config_data; |
| 402 | |
| 403 | max17042_write_verify_reg(chip->client, MAX17042_FullCAP, |
| 404 | config->fullcap); |
| 405 | max17042_write_reg(chip->client, MAX17042_DesignCap, |
| 406 | config->design_cap); |
| 407 | max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, |
| 408 | config->fullcapnom); |
| 409 | } |
| 410 | |
| 411 | static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip) |
| 412 | { |
| 413 | u16 vfSoc; |
| 414 | |
| 415 | vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); |
| 416 | max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK); |
| 417 | max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc); |
| 418 | max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK); |
| 419 | } |
| 420 | |
| 421 | static void max17042_load_new_capacity_params(struct max17042_chip *chip) |
| 422 | { |
| 423 | u16 full_cap0, rep_cap, dq_acc, vfSoc; |
| 424 | u32 rem_cap; |
| 425 | |
| 426 | struct max17042_config_data *config = chip->pdata->config_data; |
| 427 | |
| 428 | full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0); |
| 429 | vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); |
| 430 | |
| 431 | /* fg_vfSoc needs to shifted by 8 bits to get the |
| 432 | * perc in 1% accuracy, to get the right rem_cap multiply |
| 433 | * full_cap0, fg_vfSoc and devide by 100 |
| 434 | */ |
| 435 | rem_cap = ((vfSoc >> 8) * full_cap0) / 100; |
| 436 | max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap); |
| 437 | |
| 438 | rep_cap = (u16)rem_cap; |
| 439 | max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap); |
| 440 | |
| 441 | /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */ |
| 442 | dq_acc = config->fullcap / dQ_ACC_DIV; |
| 443 | max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc); |
| 444 | max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200); |
| 445 | |
| 446 | max17042_write_verify_reg(chip->client, MAX17042_FullCAP, |
| 447 | config->fullcap); |
| 448 | max17042_write_reg(chip->client, MAX17042_DesignCap, |
| 449 | config->design_cap); |
| 450 | max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, |
| 451 | config->fullcapnom); |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Block write all the override values coming from platform data. |
| 456 | * This function MUST be called before the POR initialization proceedure |
| 457 | * specified by maxim. |
| 458 | */ |
| 459 | static inline void max17042_override_por_values(struct max17042_chip *chip) |
| 460 | { |
| 461 | struct i2c_client *client = chip->client; |
| 462 | struct max17042_config_data *config = chip->pdata->config_data; |
| 463 | |
| 464 | max17042_override_por(client, MAX17042_TGAIN, config->tgain); |
| 465 | max17042_override_por(client, MAx17042_TOFF, config->toff); |
| 466 | max17042_override_por(client, MAX17042_CGAIN, config->cgain); |
| 467 | max17042_override_por(client, MAX17042_COFF, config->coff); |
| 468 | |
| 469 | max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh); |
| 470 | max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh); |
| 471 | max17042_override_por(client, MAX17042_SALRT_Th, |
| 472 | config->soc_alrt_thresh); |
| 473 | max17042_override_por(client, MAX17042_CONFIG, config->config); |
| 474 | max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer); |
| 475 | |
| 476 | max17042_override_por(client, MAX17042_DesignCap, config->design_cap); |
| 477 | max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term); |
| 478 | |
| 479 | max17042_override_por(client, MAX17042_AtRate, config->at_rate); |
| 480 | max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg); |
| 481 | max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg); |
| 482 | max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg); |
| 483 | max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg); |
| 484 | max17042_override_por(client, MAX17042_MaskSOC, config->masksoc); |
| 485 | |
| 486 | max17042_override_por(client, MAX17042_FullCAP, config->fullcap); |
| 487 | max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom); |
| 488 | max17042_override_por(client, MAX17042_SOC_empty, config->socempty); |
| 489 | max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty); |
| 490 | max17042_override_por(client, MAX17042_dQacc, config->dqacc); |
| 491 | max17042_override_por(client, MAX17042_dPacc, config->dpacc); |
| 492 | |
| 493 | max17042_override_por(client, MAX17042_V_empty, config->vempty); |
| 494 | max17042_override_por(client, MAX17042_TempNom, config->temp_nom); |
| 495 | max17042_override_por(client, MAX17042_TempLim, config->temp_lim); |
| 496 | max17042_override_por(client, MAX17042_FCTC, config->fctc); |
| 497 | max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0); |
| 498 | max17042_override_por(client, MAX17042_TempCo, config->tcompc0); |
| 499 | max17042_override_por(client, MAX17042_EmptyTempCo, |
| 500 | config->empty_tempco); |
| 501 | max17042_override_por(client, MAX17042_K_empty0, config->kempty0); |
| 502 | } |
| 503 | |
| 504 | static int max17042_init_chip(struct max17042_chip *chip) |
| 505 | { |
| 506 | int ret; |
| 507 | int val; |
| 508 | |
| 509 | max17042_override_por_values(chip); |
| 510 | /* After Power up, the MAX17042 requires 500mS in order |
| 511 | * to perform signal debouncing and initial SOC reporting |
| 512 | */ |
| 513 | msleep(500); |
| 514 | |
| 515 | /* Initialize configaration */ |
| 516 | max17042_write_config_regs(chip); |
| 517 | |
| 518 | /* write cell characterization data */ |
| 519 | ret = max17042_init_model(chip); |
| 520 | if (ret) { |
| 521 | dev_err(&chip->client->dev, "%s init failed\n", |
| 522 | __func__); |
| 523 | return -EIO; |
| 524 | } |
| 525 | max17042_verify_model_lock(chip); |
| 526 | if (ret) { |
| 527 | dev_err(&chip->client->dev, "%s lock verify failed\n", |
| 528 | __func__); |
| 529 | return -EIO; |
| 530 | } |
| 531 | /* write custom parameters */ |
| 532 | max17042_write_custom_regs(chip); |
| 533 | |
| 534 | /* update capacity params */ |
| 535 | max17042_update_capacity_regs(chip); |
| 536 | |
| 537 | /* delay must be atleast 350mS to allow VFSOC |
| 538 | * to be calculated from the new configuration |
| 539 | */ |
| 540 | msleep(350); |
| 541 | |
| 542 | /* reset vfsoc0 reg */ |
| 543 | max17042_reset_vfsoc0_reg(chip); |
| 544 | |
| 545 | /* load new capacity params */ |
| 546 | max17042_load_new_capacity_params(chip); |
| 547 | |
| 548 | /* Init complete, Clear the POR bit */ |
| 549 | val = max17042_read_reg(chip->client, MAX17042_STATUS); |
| 550 | max17042_write_reg(chip->client, MAX17042_STATUS, |
| 551 | val & (~STATUS_POR_BIT)); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | |
| 556 | static void max17042_init_worker(struct work_struct *work) |
| 557 | { |
| 558 | struct max17042_chip *chip = container_of(work, |
| 559 | struct max17042_chip, work); |
| 560 | int ret; |
| 561 | |
| 562 | /* Initialize registers according to values from the platform data */ |
| 563 | if (chip->pdata->enable_por_init && chip->pdata->config_data) { |
| 564 | ret = max17042_init_chip(chip); |
| 565 | if (ret) |
| 566 | return; |
| 567 | } |
| 568 | |
| 569 | chip->init_complete = 1; |
| 570 | } |
| 571 | |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 572 | static int __devinit max17042_probe(struct i2c_client *client, |
| 573 | const struct i2c_device_id *id) |
| 574 | { |
| 575 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| 576 | struct max17042_chip *chip; |
| 577 | int ret; |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 578 | int reg; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 579 | |
| 580 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) |
| 581 | return -EIO; |
| 582 | |
| 583 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 584 | if (!chip) |
| 585 | return -ENOMEM; |
| 586 | |
| 587 | chip->client = client; |
| 588 | chip->pdata = client->dev.platform_data; |
| 589 | |
| 590 | i2c_set_clientdata(client, chip); |
| 591 | |
| 592 | chip->battery.name = "max17042_battery"; |
| 593 | chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; |
| 594 | chip->battery.get_property = max17042_get_property; |
| 595 | chip->battery.properties = max17042_battery_props; |
| 596 | chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props); |
| 597 | |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 598 | /* When current is not measured, |
| 599 | * CURRENT_NOW and CURRENT_AVG properties should be invisible. */ |
| 600 | if (!chip->pdata->enable_current_sense) |
| 601 | chip->battery.num_properties -= 2; |
| 602 | |
Philip Rakity | 4cfa892 | 2011-08-12 21:18:18 -0700 | [diff] [blame] | 603 | if (chip->pdata->r_sns == 0) |
| 604 | chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; |
| 605 | |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 606 | if (chip->pdata->init_data) |
| 607 | max17042_set_reg(client, chip->pdata->init_data, |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 608 | chip->pdata->num_init_data); |
Donggeun Kim | 086ef50 | 2011-06-30 18:07:41 +0900 | [diff] [blame] | 609 | |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 610 | if (!chip->pdata->enable_current_sense) { |
| 611 | max17042_write_reg(client, MAX17042_CGAIN, 0x0000); |
| 612 | max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); |
| 613 | max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); |
| 614 | } |
| 615 | |
Ramakrishna Pallala | f3a71a6 | 2012-03-13 22:03:52 +0400 | [diff] [blame^] | 616 | reg = max17042_read_reg(chip->client, MAX17042_STATUS); |
| 617 | |
| 618 | if (reg & STATUS_POR_BIT) { |
| 619 | INIT_WORK(&chip->work, max17042_init_worker); |
| 620 | schedule_work(&chip->work); |
| 621 | } else { |
| 622 | chip->init_complete = 1; |
| 623 | } |
| 624 | |
| 625 | ret = power_supply_register(&client->dev, &chip->battery); |
| 626 | if (ret) { |
| 627 | dev_err(&client->dev, "failed: power supply register\n"); |
| 628 | kfree(chip); |
| 629 | } |
| 630 | return ret; |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 631 | } |
| 632 | |
| 633 | static int __devexit max17042_remove(struct i2c_client *client) |
| 634 | { |
| 635 | struct max17042_chip *chip = i2c_get_clientdata(client); |
| 636 | |
| 637 | power_supply_unregister(&chip->battery); |
MyungJoo Ham | 359ab9f | 2011-01-14 14:46:11 +0900 | [diff] [blame] | 638 | kfree(chip); |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | static const struct i2c_device_id max17042_id[] = { |
| 643 | { "max17042", 0 }, |
| 644 | { } |
| 645 | }; |
| 646 | MODULE_DEVICE_TABLE(i2c, max17042_id); |
| 647 | |
| 648 | static struct i2c_driver max17042_i2c_driver = { |
| 649 | .driver = { |
| 650 | .name = "max17042", |
| 651 | }, |
| 652 | .probe = max17042_probe, |
| 653 | .remove = __devexit_p(max17042_remove), |
| 654 | .id_table = max17042_id, |
| 655 | }; |
| 656 | |
| 657 | static int __init max17042_init(void) |
| 658 | { |
| 659 | return i2c_add_driver(&max17042_i2c_driver); |
| 660 | } |
| 661 | module_init(max17042_init); |
| 662 | |
| 663 | static void __exit max17042_exit(void) |
| 664 | { |
| 665 | i2c_del_driver(&max17042_i2c_driver); |
| 666 | } |
| 667 | module_exit(max17042_exit); |
| 668 | |
| 669 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| 670 | MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); |
| 671 | MODULE_LICENSE("GPL"); |