Anirudh Ghayal | ccc1d5b | 2012-09-18 16:19:10 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2012, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/regulator/driver.h> |
| 19 | #include <linux/regmap.h> |
| 20 | #include <linux/regulator/onsemi-ncp6335d.h> |
| 21 | |
| 22 | /* registers */ |
| 23 | #define REG_NCP6335D_PID 0x03 |
| 24 | #define REG_NCP6335D_PROGVSEL1 0x10 |
| 25 | #define REG_NCP6335D_PROGVSEL0 0x11 |
| 26 | #define REG_NCP6335D_PGOOD 0x12 |
| 27 | #define REG_NCP6335D_TIMING 0x13 |
| 28 | #define REG_NCP6335D_COMMAND 0x14 |
| 29 | |
| 30 | /* constraints */ |
| 31 | #define NCP6335D_MIN_VOLTAGE_UV 600000 |
| 32 | #define NCP6335D_STEP_VOLTAGE_UV 6250 |
| 33 | #define NCP6335D_MIN_SLEW_NS 166 |
| 34 | #define NCP6335D_MAX_SLEW_NS 1333 |
| 35 | |
| 36 | /* bits */ |
| 37 | #define NCP6335D_ENABLE BIT(7) |
| 38 | #define NCP6335D_DVS_PWM_MODE BIT(5) |
| 39 | #define NCP6335D_PWM_MODE1 BIT(6) |
| 40 | #define NCP6335D_PWM_MODE0 BIT(7) |
| 41 | #define NCP6335D_PGOOD_DISCHG BIT(4) |
Anirudh Ghayal | c91e7e5 | 2012-12-10 11:37:36 +0530 | [diff] [blame] | 42 | #define NCP6335D_SLEEP_MODE BIT(4) |
Anirudh Ghayal | ccc1d5b | 2012-09-18 16:19:10 +0530 | [diff] [blame] | 43 | |
| 44 | #define NCP6335D_VOUT_SEL_MASK 0x7F |
| 45 | #define NCP6335D_SLEW_MASK 0x18 |
| 46 | #define NCP6335D_SLEW_SHIFT 0x3 |
| 47 | |
| 48 | struct ncp6335d_info { |
| 49 | struct regulator_dev *regulator; |
| 50 | struct regulator_init_data *init_data; |
| 51 | struct regmap *regmap; |
| 52 | struct device *dev; |
| 53 | unsigned int vsel_reg; |
| 54 | unsigned int mode_bit; |
| 55 | int curr_voltage; |
| 56 | int slew_rate; |
| 57 | }; |
| 58 | |
| 59 | static void dump_registers(struct ncp6335d_info *dd, |
| 60 | unsigned int reg, const char *func) |
| 61 | { |
| 62 | unsigned int val = 0; |
| 63 | |
| 64 | regmap_read(dd->regmap, reg, &val); |
| 65 | dev_dbg(dd->dev, "%s: NCP6335D: Reg = %x, Val = %x\n", func, reg, val); |
| 66 | } |
| 67 | |
| 68 | static void ncp633d_slew_delay(struct ncp6335d_info *dd, |
| 69 | int prev_uV, int new_uV) |
| 70 | { |
| 71 | u8 val; |
| 72 | int delay; |
| 73 | |
| 74 | val = abs(prev_uV - new_uV) / NCP6335D_STEP_VOLTAGE_UV; |
| 75 | delay = (val * dd->slew_rate / 1000) + 1; |
| 76 | |
| 77 | dev_dbg(dd->dev, "Slew Delay = %d\n", delay); |
| 78 | |
| 79 | udelay(delay); |
| 80 | } |
| 81 | |
| 82 | static int ncp6335d_enable(struct regulator_dev *rdev) |
| 83 | { |
| 84 | int rc; |
| 85 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 86 | |
| 87 | rc = regmap_update_bits(dd->regmap, dd->vsel_reg, |
| 88 | NCP6335D_ENABLE, NCP6335D_ENABLE); |
| 89 | if (rc) |
| 90 | dev_err(dd->dev, "Unable to enable regualtor rc(%d)", rc); |
| 91 | |
| 92 | dump_registers(dd, dd->vsel_reg, __func__); |
| 93 | |
| 94 | return rc; |
| 95 | } |
| 96 | |
| 97 | static int ncp6335d_disable(struct regulator_dev *rdev) |
| 98 | { |
| 99 | int rc; |
| 100 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 101 | |
| 102 | rc = regmap_update_bits(dd->regmap, dd->vsel_reg, |
| 103 | NCP6335D_ENABLE, 0); |
| 104 | if (rc) |
| 105 | dev_err(dd->dev, "Unable to disable regualtor rc(%d)", rc); |
| 106 | |
| 107 | dump_registers(dd, dd->vsel_reg, __func__); |
| 108 | |
| 109 | return rc; |
| 110 | } |
| 111 | |
| 112 | static int ncp6335d_get_voltage(struct regulator_dev *rdev) |
| 113 | { |
| 114 | unsigned int val; |
| 115 | int rc; |
| 116 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 117 | |
| 118 | rc = regmap_read(dd->regmap, dd->vsel_reg, &val); |
| 119 | if (rc) { |
| 120 | dev_err(dd->dev, "Unable to get volatge rc(%d)", rc); |
| 121 | return rc; |
| 122 | } |
| 123 | dd->curr_voltage = ((val & NCP6335D_VOUT_SEL_MASK) * |
| 124 | NCP6335D_STEP_VOLTAGE_UV) + NCP6335D_MIN_VOLTAGE_UV; |
| 125 | |
| 126 | dump_registers(dd, dd->vsel_reg, __func__); |
| 127 | |
| 128 | return dd->curr_voltage; |
| 129 | } |
| 130 | |
| 131 | static int ncp6335d_set_voltage(struct regulator_dev *rdev, |
| 132 | int min_uV, int max_uV, unsigned *selector) |
| 133 | { |
| 134 | int rc, set_val, new_uV; |
| 135 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 136 | |
| 137 | set_val = DIV_ROUND_UP(min_uV - NCP6335D_MIN_VOLTAGE_UV, |
| 138 | NCP6335D_STEP_VOLTAGE_UV); |
| 139 | new_uV = (set_val * NCP6335D_STEP_VOLTAGE_UV) + |
| 140 | NCP6335D_MIN_VOLTAGE_UV; |
| 141 | if (new_uV > max_uV) { |
| 142 | dev_err(dd->dev, "Unable to set volatge (%d %d)\n", |
| 143 | min_uV, max_uV); |
| 144 | return -EINVAL; |
| 145 | } |
| 146 | |
| 147 | rc = regmap_update_bits(dd->regmap, dd->vsel_reg, |
| 148 | NCP6335D_VOUT_SEL_MASK, (set_val & NCP6335D_VOUT_SEL_MASK)); |
| 149 | if (rc) { |
| 150 | dev_err(dd->dev, "Unable to set volatge (%d %d)\n", |
| 151 | min_uV, max_uV); |
| 152 | } else { |
| 153 | ncp633d_slew_delay(dd, dd->curr_voltage, new_uV); |
| 154 | dd->curr_voltage = new_uV; |
| 155 | } |
| 156 | |
| 157 | dump_registers(dd, dd->vsel_reg, __func__); |
| 158 | |
| 159 | return rc; |
| 160 | } |
| 161 | |
| 162 | static int ncp6335d_set_mode(struct regulator_dev *rdev, |
| 163 | unsigned int mode) |
| 164 | { |
| 165 | int rc; |
| 166 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 167 | |
| 168 | /* only FAST and NORMAL mode types are supported */ |
| 169 | if (mode != REGULATOR_MODE_FAST && mode != REGULATOR_MODE_NORMAL) { |
| 170 | dev_err(dd->dev, "Mode %d not supported\n", mode); |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | |
| 174 | rc = regmap_update_bits(dd->regmap, REG_NCP6335D_COMMAND, dd->mode_bit, |
| 175 | (mode == REGULATOR_MODE_FAST) ? dd->mode_bit : 0); |
| 176 | if (rc) { |
| 177 | dev_err(dd->dev, "Unable to set operating mode rc(%d)", rc); |
| 178 | return rc; |
| 179 | } |
| 180 | |
| 181 | rc = regmap_update_bits(dd->regmap, REG_NCP6335D_COMMAND, |
| 182 | NCP6335D_DVS_PWM_MODE, |
| 183 | (mode == REGULATOR_MODE_FAST) ? |
| 184 | NCP6335D_DVS_PWM_MODE : 0); |
| 185 | if (rc) |
| 186 | dev_err(dd->dev, "Unable to set DVS trans. mode rc(%d)", rc); |
| 187 | |
| 188 | dump_registers(dd, REG_NCP6335D_COMMAND, __func__); |
| 189 | |
| 190 | return rc; |
| 191 | } |
| 192 | |
| 193 | static unsigned int ncp6335d_get_mode(struct regulator_dev *rdev) |
| 194 | { |
| 195 | unsigned int val; |
| 196 | int rc; |
| 197 | struct ncp6335d_info *dd = rdev_get_drvdata(rdev); |
| 198 | |
| 199 | rc = regmap_read(dd->regmap, REG_NCP6335D_COMMAND, &val); |
| 200 | if (rc) { |
| 201 | dev_err(dd->dev, "Unable to get regulator mode rc(%d)\n", rc); |
| 202 | return rc; |
| 203 | } |
| 204 | |
| 205 | dump_registers(dd, REG_NCP6335D_COMMAND, __func__); |
| 206 | |
| 207 | if (val & dd->mode_bit) |
| 208 | return REGULATOR_MODE_FAST; |
| 209 | |
| 210 | return REGULATOR_MODE_NORMAL; |
| 211 | } |
| 212 | |
| 213 | static struct regulator_ops ncp6335d_ops = { |
| 214 | .set_voltage = ncp6335d_set_voltage, |
| 215 | .get_voltage = ncp6335d_get_voltage, |
| 216 | .enable = ncp6335d_enable, |
| 217 | .disable = ncp6335d_disable, |
| 218 | .set_mode = ncp6335d_set_mode, |
| 219 | .get_mode = ncp6335d_get_mode, |
| 220 | }; |
| 221 | |
| 222 | static struct regulator_desc rdesc = { |
| 223 | .name = "ncp6335d", |
| 224 | .owner = THIS_MODULE, |
| 225 | .n_voltages = 128, |
| 226 | .ops = &ncp6335d_ops, |
| 227 | }; |
| 228 | |
| 229 | static int __devinit ncp6335d_init(struct ncp6335d_info *dd, |
| 230 | const struct ncp6335d_platform_data *pdata) |
| 231 | { |
| 232 | int rc; |
| 233 | unsigned int val; |
| 234 | |
| 235 | switch (pdata->default_vsel) { |
| 236 | case NCP6335D_VSEL0: |
| 237 | dd->vsel_reg = REG_NCP6335D_PROGVSEL0; |
| 238 | dd->mode_bit = NCP6335D_PWM_MODE0; |
| 239 | break; |
| 240 | case NCP6335D_VSEL1: |
| 241 | dd->vsel_reg = REG_NCP6335D_PROGVSEL1; |
| 242 | dd->mode_bit = NCP6335D_PWM_MODE1; |
| 243 | break; |
| 244 | default: |
| 245 | dev_err(dd->dev, "Invalid VSEL ID %d\n", pdata->default_vsel); |
| 246 | return -EINVAL; |
| 247 | } |
| 248 | |
| 249 | /* get the current programmed voltage */ |
| 250 | rc = regmap_read(dd->regmap, dd->vsel_reg, &val); |
| 251 | if (rc) { |
| 252 | dev_err(dd->dev, "Unable to get volatge rc(%d)", rc); |
| 253 | return rc; |
| 254 | } |
| 255 | dd->curr_voltage = ((val & NCP6335D_VOUT_SEL_MASK) * |
| 256 | NCP6335D_STEP_VOLTAGE_UV) + NCP6335D_MIN_VOLTAGE_UV; |
| 257 | |
| 258 | /* set discharge */ |
| 259 | rc = regmap_update_bits(dd->regmap, REG_NCP6335D_PGOOD, |
| 260 | NCP6335D_PGOOD_DISCHG, |
| 261 | (pdata->discharge_enable ? |
| 262 | NCP6335D_PGOOD_DISCHG : 0)); |
| 263 | if (rc) { |
| 264 | dev_err(dd->dev, "Unable to set Active Discharge rc(%d)\n", rc); |
| 265 | return -EINVAL; |
| 266 | } |
| 267 | |
| 268 | /* set slew rate */ |
| 269 | if (pdata->slew_rate_ns < NCP6335D_MIN_SLEW_NS || |
| 270 | pdata->slew_rate_ns > NCP6335D_MAX_SLEW_NS) { |
| 271 | dev_err(dd->dev, "Invalid slew rate %d\n", pdata->slew_rate_ns); |
| 272 | return -EINVAL; |
| 273 | } |
| 274 | val = DIV_ROUND_UP(pdata->slew_rate_ns - NCP6335D_MIN_SLEW_NS, |
| 275 | NCP6335D_MIN_SLEW_NS); |
| 276 | val >>= 1; |
| 277 | dd->slew_rate = val * NCP6335D_MIN_SLEW_NS; |
| 278 | |
| 279 | rc = regmap_update_bits(dd->regmap, REG_NCP6335D_TIMING, |
| 280 | NCP6335D_SLEW_MASK, val << NCP6335D_SLEW_SHIFT); |
| 281 | if (rc) |
| 282 | dev_err(dd->dev, "Unable to set slew rate rc(%d)\n", rc); |
| 283 | |
Anirudh Ghayal | c91e7e5 | 2012-12-10 11:37:36 +0530 | [diff] [blame] | 284 | /* Set Sleep mode bit */ |
| 285 | rc = regmap_update_bits(dd->regmap, REG_NCP6335D_COMMAND, |
| 286 | NCP6335D_SLEEP_MODE, pdata->sleep_enable ? |
| 287 | NCP6335D_SLEEP_MODE : 0); |
| 288 | if (rc) |
| 289 | dev_err(dd->dev, "Unable to set sleep mode (%d)\n", rc); |
| 290 | |
| 291 | dump_registers(dd, REG_NCP6335D_COMMAND, __func__); |
Anirudh Ghayal | ccc1d5b | 2012-09-18 16:19:10 +0530 | [diff] [blame] | 292 | dump_registers(dd, REG_NCP6335D_PROGVSEL0, __func__); |
| 293 | dump_registers(dd, REG_NCP6335D_TIMING, __func__); |
| 294 | dump_registers(dd, REG_NCP6335D_PGOOD, __func__); |
| 295 | |
| 296 | return rc; |
| 297 | } |
| 298 | |
| 299 | static struct regmap_config ncp6335d_regmap_config = { |
| 300 | .reg_bits = 8, |
| 301 | .val_bits = 8, |
| 302 | }; |
| 303 | |
| 304 | static int __devinit ncp6335d_regulator_probe(struct i2c_client *client, |
| 305 | const struct i2c_device_id *id) |
| 306 | { |
| 307 | int rc; |
| 308 | unsigned int val = 0; |
| 309 | struct ncp6335d_info *dd; |
| 310 | const struct ncp6335d_platform_data *pdata; |
| 311 | |
| 312 | pdata = client->dev.platform_data; |
| 313 | if (!pdata) { |
| 314 | dev_err(&client->dev, "Platform data not specified\n"); |
| 315 | return -EINVAL; |
| 316 | } |
| 317 | |
| 318 | dd = devm_kzalloc(&client->dev, sizeof(*dd), GFP_KERNEL); |
| 319 | if (!dd) { |
| 320 | dev_err(&client->dev, "Unable to allocate memory\n"); |
| 321 | return -ENOMEM; |
| 322 | } |
| 323 | |
| 324 | dd->regmap = devm_regmap_init_i2c(client, &ncp6335d_regmap_config); |
| 325 | if (IS_ERR(dd->regmap)) { |
| 326 | dev_err(&client->dev, "Error allocating regmap\n"); |
| 327 | return PTR_ERR(dd->regmap); |
| 328 | } |
| 329 | |
| 330 | rc = regmap_read(dd->regmap, REG_NCP6335D_PID, &val); |
| 331 | if (rc) { |
| 332 | dev_err(&client->dev, "Unable to identify NCP6335D, rc(%d)\n", |
| 333 | rc); |
| 334 | return rc; |
| 335 | } |
| 336 | dev_info(&client->dev, "Detected Regulator NCP6335D PID = %d\n", val); |
| 337 | |
| 338 | dd->init_data = pdata->init_data; |
| 339 | dd->dev = &client->dev; |
| 340 | i2c_set_clientdata(client, dd); |
| 341 | |
| 342 | rc = ncp6335d_init(dd, pdata); |
| 343 | if (rc) { |
| 344 | dev_err(&client->dev, "Unable to intialize the regulator\n"); |
| 345 | return -EINVAL; |
| 346 | } |
| 347 | |
| 348 | dd->regulator = regulator_register(&rdesc, &client->dev, |
| 349 | dd->init_data, dd, NULL); |
| 350 | if (IS_ERR(dd->regulator)) { |
| 351 | dev_err(&client->dev, "Unable to register regulator rc(%ld)", |
| 352 | PTR_ERR(dd->regulator)); |
| 353 | return PTR_ERR(dd->regulator); |
| 354 | } |
| 355 | |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | static int __devexit ncp6335d_regulator_remove(struct i2c_client *client) |
| 360 | { |
| 361 | struct ncp6335d_info *dd = i2c_get_clientdata(client); |
| 362 | |
| 363 | regulator_unregister(dd->regulator); |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static const struct i2c_device_id ncp6335d_id[] = { |
| 369 | {"ncp6335d", -1}, |
| 370 | { }, |
| 371 | }; |
| 372 | |
| 373 | static struct i2c_driver ncp6335d_regulator_driver = { |
| 374 | .driver = { |
| 375 | .name = "ncp6335d-regulator", |
| 376 | }, |
| 377 | .probe = ncp6335d_regulator_probe, |
| 378 | .remove = __devexit_p(ncp6335d_regulator_remove), |
| 379 | .id_table = ncp6335d_id, |
| 380 | }; |
Utsab Bose | 43a4ba6 | 2012-11-06 11:39:45 +0530 | [diff] [blame] | 381 | static int __init ncp6335d_regulator_init(void) |
| 382 | { |
| 383 | return i2c_add_driver(&ncp6335d_regulator_driver); |
| 384 | } |
| 385 | subsys_initcall(ncp6335d_regulator_init); |
Anirudh Ghayal | ccc1d5b | 2012-09-18 16:19:10 +0530 | [diff] [blame] | 386 | |
Utsab Bose | 43a4ba6 | 2012-11-06 11:39:45 +0530 | [diff] [blame] | 387 | static void __exit ncp6335d_regulator_exit(void) |
| 388 | { |
| 389 | i2c_del_driver(&ncp6335d_regulator_driver); |
| 390 | } |
| 391 | module_exit(ncp6335d_regulator_exit); |
Anirudh Ghayal | ccc1d5b | 2012-09-18 16:19:10 +0530 | [diff] [blame] | 392 | MODULE_DESCRIPTION("OnSemi-NCP6335D regulator driver"); |
| 393 | MODULE_LICENSE("GPL v2"); |