Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 1 | /* |
| 2 | * max8973-regulator.c -- Maxim max8973 |
| 3 | * |
| 4 | * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator. |
| 5 | * |
| 6 | * Copyright (c) 2012, NVIDIA Corporation. |
| 7 | * |
| 8 | * Author: Laxman Dewangan <ldewangan@nvidia.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation version 2. |
| 13 | * |
| 14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, |
| 15 | * whether express or implied; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 22 | * 02111-1307, USA |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/err.h> |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 29 | #include <linux/of.h> |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 30 | #include <linux/platform_device.h> |
| 31 | #include <linux/regulator/driver.h> |
| 32 | #include <linux/regulator/machine.h> |
| 33 | #include <linux/regulator/max8973-regulator.h> |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 34 | #include <linux/regulator/of_regulator.h> |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 35 | #include <linux/gpio.h> |
| 36 | #include <linux/i2c.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/regmap.h> |
| 39 | |
| 40 | /* Register definitions */ |
| 41 | #define MAX8973_VOUT 0x0 |
| 42 | #define MAX8973_VOUT_DVS 0x1 |
| 43 | #define MAX8973_CONTROL1 0x2 |
| 44 | #define MAX8973_CONTROL2 0x3 |
| 45 | #define MAX8973_CHIPID1 0x4 |
| 46 | #define MAX8973_CHIPID2 0x5 |
| 47 | |
| 48 | #define MAX8973_MAX_VOUT_REG 2 |
| 49 | |
| 50 | /* MAX8973_VOUT */ |
| 51 | #define MAX8973_VOUT_ENABLE BIT(7) |
| 52 | #define MAX8973_VOUT_MASK 0x7F |
| 53 | |
| 54 | /* MAX8973_VOUT_DVS */ |
| 55 | #define MAX8973_DVS_VOUT_MASK 0x7F |
| 56 | |
| 57 | /* MAX8973_CONTROL1 */ |
| 58 | #define MAX8973_SNS_ENABLE BIT(7) |
| 59 | #define MAX8973_FPWM_EN_M BIT(6) |
| 60 | #define MAX8973_NFSR_ENABLE BIT(5) |
| 61 | #define MAX8973_AD_ENABLE BIT(4) |
| 62 | #define MAX8973_BIAS_ENABLE BIT(3) |
| 63 | #define MAX8973_FREQSHIFT_9PER BIT(2) |
| 64 | |
| 65 | #define MAX8973_RAMP_12mV_PER_US 0x0 |
| 66 | #define MAX8973_RAMP_25mV_PER_US 0x1 |
| 67 | #define MAX8973_RAMP_50mV_PER_US 0x2 |
| 68 | #define MAX8973_RAMP_200mV_PER_US 0x3 |
| 69 | |
| 70 | /* MAX8973_CONTROL2 */ |
| 71 | #define MAX8973_WDTMR_ENABLE BIT(6) |
| 72 | #define MAX8973_DISCH_ENBABLE BIT(5) |
| 73 | #define MAX8973_FT_ENABLE BIT(4) |
| 74 | |
| 75 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC |
| 76 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 |
| 77 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 |
| 78 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 |
| 79 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 |
| 80 | |
| 81 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 |
| 82 | #define MAX8973_INDUCTOR_NOMINAL 0x1 |
| 83 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 |
| 84 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 |
| 85 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 |
| 86 | |
| 87 | #define MAX8973_MIN_VOLATGE 606250 |
| 88 | #define MAX8973_MAX_VOLATGE 1400000 |
| 89 | #define MAX8973_VOLATGE_STEP 6250 |
| 90 | #define MAX8973_BUCK_N_VOLTAGE 0x80 |
| 91 | |
| 92 | /* Maxim 8973 chip information */ |
| 93 | struct max8973_chip { |
| 94 | struct device *dev; |
| 95 | struct regulator_desc desc; |
| 96 | struct regulator_dev *rdev; |
| 97 | struct regmap *regmap; |
| 98 | bool enable_external_control; |
| 99 | int dvs_gpio; |
| 100 | int lru_index[MAX8973_MAX_VOUT_REG]; |
| 101 | int curr_vout_val[MAX8973_MAX_VOUT_REG]; |
| 102 | int curr_vout_reg; |
| 103 | int curr_gpio_val; |
| 104 | bool valid_dvs_gpio; |
Guennadi Liakhovetski | db892ff | 2013-06-21 08:30:22 +0200 | [diff] [blame] | 105 | struct regulator_ops ops; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 106 | }; |
| 107 | |
| 108 | /* |
| 109 | * find_voltage_set_register: Find new voltage configuration register (VOUT). |
| 110 | * The finding of the new VOUT register will be based on the LRU mechanism. |
| 111 | * Each VOUT register will have different voltage configured . This |
| 112 | * Function will look if any of the VOUT register have requested voltage set |
| 113 | * or not. |
| 114 | * - If it is already there then it will make that register as most |
| 115 | * recently used and return as found so that caller need not to set |
| 116 | * the VOUT register but need to set the proper gpios to select this |
| 117 | * VOUT register. |
| 118 | * - If requested voltage is not found then it will use the least |
| 119 | * recently mechanism to get new VOUT register for new configuration |
| 120 | * and will return not_found so that caller need to set new VOUT |
| 121 | * register and then gpios (both). |
| 122 | */ |
| 123 | static bool find_voltage_set_register(struct max8973_chip *tps, |
| 124 | int req_vsel, int *vout_reg, int *gpio_val) |
| 125 | { |
| 126 | int i; |
| 127 | bool found = false; |
| 128 | int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; |
| 129 | int found_index = MAX8973_MAX_VOUT_REG - 1; |
| 130 | |
| 131 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { |
| 132 | if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { |
| 133 | new_vout_reg = tps->lru_index[i]; |
| 134 | found_index = i; |
| 135 | found = true; |
| 136 | goto update_lru_index; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | update_lru_index: |
| 141 | for (i = found_index; i > 0; i--) |
| 142 | tps->lru_index[i] = tps->lru_index[i - 1]; |
| 143 | |
| 144 | tps->lru_index[0] = new_vout_reg; |
| 145 | *gpio_val = new_vout_reg; |
| 146 | *vout_reg = MAX8973_VOUT + new_vout_reg; |
| 147 | return found; |
| 148 | } |
| 149 | |
| 150 | static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) |
| 151 | { |
| 152 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
| 153 | unsigned int data; |
| 154 | int ret; |
| 155 | |
| 156 | ret = regmap_read(max->regmap, max->curr_vout_reg, &data); |
| 157 | if (ret < 0) { |
| 158 | dev_err(max->dev, "register %d read failed, err = %d\n", |
| 159 | max->curr_vout_reg, ret); |
| 160 | return ret; |
| 161 | } |
| 162 | return data & MAX8973_VOUT_MASK; |
| 163 | } |
| 164 | |
| 165 | static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, |
| 166 | unsigned vsel) |
| 167 | { |
| 168 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
| 169 | int ret; |
| 170 | bool found = false; |
| 171 | int vout_reg = max->curr_vout_reg; |
| 172 | int gpio_val = max->curr_gpio_val; |
| 173 | |
| 174 | /* |
| 175 | * If gpios are available to select the VOUT register then least |
| 176 | * recently used register for new configuration. |
| 177 | */ |
| 178 | if (max->valid_dvs_gpio) |
| 179 | found = find_voltage_set_register(max, vsel, |
| 180 | &vout_reg, &gpio_val); |
| 181 | |
| 182 | if (!found) { |
| 183 | ret = regmap_update_bits(max->regmap, vout_reg, |
| 184 | MAX8973_VOUT_MASK, vsel); |
| 185 | if (ret < 0) { |
| 186 | dev_err(max->dev, "register %d update failed, err %d\n", |
| 187 | vout_reg, ret); |
| 188 | return ret; |
| 189 | } |
| 190 | max->curr_vout_reg = vout_reg; |
| 191 | max->curr_vout_val[gpio_val] = vsel; |
| 192 | } |
| 193 | |
| 194 | /* Select proper VOUT register vio gpios */ |
| 195 | if (max->valid_dvs_gpio) { |
| 196 | gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); |
| 197 | max->curr_gpio_val = gpio_val; |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) |
| 203 | { |
| 204 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
| 205 | int ret; |
| 206 | int pwm; |
| 207 | |
| 208 | /* Enable force PWM mode in FAST mode only. */ |
| 209 | switch (mode) { |
| 210 | case REGULATOR_MODE_FAST: |
| 211 | pwm = MAX8973_FPWM_EN_M; |
| 212 | break; |
| 213 | |
| 214 | case REGULATOR_MODE_NORMAL: |
| 215 | pwm = 0; |
| 216 | break; |
| 217 | |
| 218 | default: |
| 219 | return -EINVAL; |
| 220 | } |
| 221 | |
| 222 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, |
| 223 | MAX8973_FPWM_EN_M, pwm); |
| 224 | if (ret < 0) |
| 225 | dev_err(max->dev, "register %d update failed, err %d\n", |
| 226 | MAX8973_CONTROL1, ret); |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) |
| 231 | { |
| 232 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
| 233 | unsigned int data; |
| 234 | int ret; |
| 235 | |
| 236 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); |
| 237 | if (ret < 0) { |
| 238 | dev_err(max->dev, "register %d read failed, err %d\n", |
| 239 | MAX8973_CONTROL1, ret); |
| 240 | return ret; |
| 241 | } |
| 242 | return (data & MAX8973_FPWM_EN_M) ? |
| 243 | REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; |
| 244 | } |
| 245 | |
Guennadi Liakhovetski | db892ff | 2013-06-21 08:30:22 +0200 | [diff] [blame] | 246 | static const struct regulator_ops max8973_dcdc_ops = { |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 247 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
| 248 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, |
| 249 | .list_voltage = regulator_list_voltage_linear, |
| 250 | .set_mode = max8973_dcdc_set_mode, |
| 251 | .get_mode = max8973_dcdc_get_mode, |
| 252 | }; |
| 253 | |
Greg Kroah-Hartman | 3d68dfe | 2012-12-21 13:26:06 -0800 | [diff] [blame] | 254 | static int max8973_init_dcdc(struct max8973_chip *max, |
| 255 | struct max8973_regulator_platform_data *pdata) |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 256 | { |
| 257 | int ret; |
| 258 | uint8_t control1 = 0; |
| 259 | uint8_t control2 = 0; |
| 260 | |
| 261 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) |
| 262 | control1 |= MAX8973_SNS_ENABLE; |
| 263 | |
| 264 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) |
| 265 | control1 |= MAX8973_NFSR_ENABLE; |
| 266 | |
| 267 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) |
| 268 | control1 |= MAX8973_AD_ENABLE; |
| 269 | |
| 270 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) |
| 271 | control1 |= MAX8973_BIAS_ENABLE; |
| 272 | |
| 273 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) |
| 274 | control1 |= MAX8973_FREQSHIFT_9PER; |
| 275 | |
| 276 | /* Set ramp delay */ |
| 277 | if (pdata->reg_init_data && |
| 278 | pdata->reg_init_data->constraints.ramp_delay) { |
| 279 | if (pdata->reg_init_data->constraints.ramp_delay < 25000) |
Axel Lin | b27032c | 2013-04-24 00:14:55 +0800 | [diff] [blame] | 280 | control1 |= MAX8973_RAMP_12mV_PER_US; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 281 | else if (pdata->reg_init_data->constraints.ramp_delay < 50000) |
Axel Lin | b27032c | 2013-04-24 00:14:55 +0800 | [diff] [blame] | 282 | control1 |= MAX8973_RAMP_25mV_PER_US; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 283 | else if (pdata->reg_init_data->constraints.ramp_delay < 200000) |
Axel Lin | b27032c | 2013-04-24 00:14:55 +0800 | [diff] [blame] | 284 | control1 |= MAX8973_RAMP_50mV_PER_US; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 285 | else |
Axel Lin | b27032c | 2013-04-24 00:14:55 +0800 | [diff] [blame] | 286 | control1 |= MAX8973_RAMP_200mV_PER_US; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 287 | } else { |
Axel Lin | b27032c | 2013-04-24 00:14:55 +0800 | [diff] [blame] | 288 | control1 |= MAX8973_RAMP_12mV_PER_US; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 289 | max->desc.ramp_delay = 12500; |
| 290 | } |
| 291 | |
| 292 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
| 293 | control2 |= MAX8973_DISCH_ENBABLE; |
| 294 | |
| 295 | /* Clock advance trip configuration */ |
| 296 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { |
| 297 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: |
| 298 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; |
| 299 | break; |
| 300 | |
| 301 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: |
| 302 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; |
| 303 | break; |
| 304 | |
| 305 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: |
| 306 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; |
| 307 | break; |
| 308 | |
| 309 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: |
| 310 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; |
| 311 | break; |
| 312 | } |
| 313 | |
| 314 | /* Configure inductor value */ |
| 315 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { |
| 316 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: |
| 317 | control2 |= MAX8973_INDUCTOR_NOMINAL; |
| 318 | break; |
| 319 | |
| 320 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: |
| 321 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; |
| 322 | break; |
| 323 | |
| 324 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: |
| 325 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; |
| 326 | break; |
| 327 | |
| 328 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: |
| 329 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); |
| 334 | if (ret < 0) { |
| 335 | dev_err(max->dev, "register %d write failed, err = %d", |
| 336 | MAX8973_CONTROL1, ret); |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); |
| 341 | if (ret < 0) { |
| 342 | dev_err(max->dev, "register %d write failed, err = %d", |
| 343 | MAX8973_CONTROL2, ret); |
| 344 | return ret; |
| 345 | } |
| 346 | |
| 347 | /* If external control is enabled then disable EN bit */ |
| 348 | if (max->enable_external_control) { |
| 349 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
| 350 | MAX8973_VOUT_ENABLE, 0); |
| 351 | if (ret < 0) |
| 352 | dev_err(max->dev, "register %d update failed, err = %d", |
| 353 | MAX8973_VOUT, ret); |
| 354 | } |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | static const struct regmap_config max8973_regmap_config = { |
| 359 | .reg_bits = 8, |
| 360 | .val_bits = 8, |
| 361 | .max_register = MAX8973_CHIPID2, |
| 362 | .cache_type = REGCACHE_RBTREE, |
| 363 | }; |
| 364 | |
Greg Kroah-Hartman | 3d68dfe | 2012-12-21 13:26:06 -0800 | [diff] [blame] | 365 | static int max8973_probe(struct i2c_client *client, |
| 366 | const struct i2c_device_id *id) |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 367 | { |
| 368 | struct max8973_regulator_platform_data *pdata; |
| 369 | struct regulator_config config = { }; |
| 370 | struct regulator_dev *rdev; |
| 371 | struct max8973_chip *max; |
| 372 | int ret; |
| 373 | |
| 374 | pdata = client->dev.platform_data; |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 375 | |
| 376 | if (!pdata && !client->dev.of_node) { |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 377 | dev_err(&client->dev, "No Platform data"); |
| 378 | return -EIO; |
| 379 | } |
| 380 | |
| 381 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
| 382 | if (!max) { |
| 383 | dev_err(&client->dev, "Memory allocation for max failed\n"); |
| 384 | return -ENOMEM; |
| 385 | } |
| 386 | |
| 387 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); |
| 388 | if (IS_ERR(max->regmap)) { |
| 389 | ret = PTR_ERR(max->regmap); |
| 390 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); |
| 391 | return ret; |
| 392 | } |
| 393 | |
| 394 | i2c_set_clientdata(client, max); |
Guennadi Liakhovetski | db892ff | 2013-06-21 08:30:22 +0200 | [diff] [blame] | 395 | max->ops = max8973_dcdc_ops; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 396 | max->dev = &client->dev; |
| 397 | max->desc.name = id->name; |
| 398 | max->desc.id = 0; |
Guennadi Liakhovetski | db892ff | 2013-06-21 08:30:22 +0200 | [diff] [blame] | 399 | max->desc.ops = &max->ops; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 400 | max->desc.type = REGULATOR_VOLTAGE; |
| 401 | max->desc.owner = THIS_MODULE; |
| 402 | max->desc.min_uV = MAX8973_MIN_VOLATGE; |
| 403 | max->desc.uV_step = MAX8973_VOLATGE_STEP; |
| 404 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; |
| 405 | |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 406 | if (!pdata || !pdata->enable_ext_control) { |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 407 | max->desc.enable_reg = MAX8973_VOUT; |
| 408 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; |
Guennadi Liakhovetski | db892ff | 2013-06-21 08:30:22 +0200 | [diff] [blame] | 409 | max->ops.enable = regulator_enable_regmap; |
| 410 | max->ops.disable = regulator_disable_regmap; |
| 411 | max->ops.is_enabled = regulator_is_enabled_regmap; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 412 | } |
| 413 | |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 414 | if (pdata) { |
| 415 | max->dvs_gpio = pdata->dvs_gpio; |
| 416 | max->enable_external_control = pdata->enable_ext_control; |
| 417 | max->curr_gpio_val = pdata->dvs_def_state; |
| 418 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; |
| 419 | } else { |
| 420 | max->dvs_gpio = -EINVAL; |
| 421 | max->curr_vout_reg = MAX8973_VOUT; |
| 422 | } |
| 423 | |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 424 | max->lru_index[0] = max->curr_vout_reg; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 425 | |
| 426 | if (gpio_is_valid(max->dvs_gpio)) { |
| 427 | int gpio_flags; |
| 428 | int i; |
| 429 | |
| 430 | gpio_flags = (pdata->dvs_def_state) ? |
| 431 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; |
| 432 | ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, |
| 433 | gpio_flags, "max8973-dvs"); |
| 434 | if (ret) { |
| 435 | dev_err(&client->dev, |
| 436 | "gpio_request for gpio %d failed, err = %d\n", |
| 437 | max->dvs_gpio, ret); |
| 438 | return ret; |
| 439 | } |
| 440 | max->valid_dvs_gpio = true; |
| 441 | |
| 442 | /* |
| 443 | * Initialize the lru index with vout_reg id |
| 444 | * The index 0 will be most recently used and |
| 445 | * set with the max->curr_vout_reg */ |
| 446 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) |
| 447 | max->lru_index[i] = i; |
| 448 | max->lru_index[0] = max->curr_vout_reg; |
| 449 | max->lru_index[max->curr_vout_reg] = 0; |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 450 | } else { |
| 451 | max->valid_dvs_gpio = false; |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 452 | } |
| 453 | |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 454 | if (pdata) { |
| 455 | ret = max8973_init_dcdc(max, pdata); |
| 456 | if (ret < 0) { |
| 457 | dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); |
| 458 | return ret; |
| 459 | } |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | config.dev = &client->dev; |
Guennadi Liakhovetski | 42dc302 | 2013-06-24 12:50:16 +0200 | [diff] [blame] | 463 | config.init_data = pdata ? pdata->reg_init_data : |
| 464 | of_get_regulator_init_data(&client->dev, client->dev.of_node); |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 465 | config.driver_data = max; |
| 466 | config.of_node = client->dev.of_node; |
| 467 | config.regmap = max->regmap; |
| 468 | |
| 469 | /* Register the regulators */ |
| 470 | rdev = regulator_register(&max->desc, &config); |
| 471 | if (IS_ERR(rdev)) { |
| 472 | ret = PTR_ERR(rdev); |
| 473 | dev_err(max->dev, "regulator register failed, err %d\n", ret); |
| 474 | return ret; |
| 475 | } |
| 476 | |
| 477 | max->rdev = rdev; |
| 478 | return 0; |
| 479 | } |
| 480 | |
Greg Kroah-Hartman | 3d68dfe | 2012-12-21 13:26:06 -0800 | [diff] [blame] | 481 | static int max8973_remove(struct i2c_client *client) |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 482 | { |
| 483 | struct max8973_chip *max = i2c_get_clientdata(client); |
| 484 | |
| 485 | regulator_unregister(max->rdev); |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static const struct i2c_device_id max8973_id[] = { |
| 490 | {.name = "max8973",}, |
| 491 | {}, |
| 492 | }; |
| 493 | |
| 494 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
| 495 | |
| 496 | static struct i2c_driver max8973_i2c_driver = { |
| 497 | .driver = { |
| 498 | .name = "max8973", |
| 499 | .owner = THIS_MODULE, |
| 500 | }, |
| 501 | .probe = max8973_probe, |
Greg Kroah-Hartman | 3d68dfe | 2012-12-21 13:26:06 -0800 | [diff] [blame] | 502 | .remove = max8973_remove, |
Laxman Dewangan | 5928f53 | 2012-11-19 06:58:29 +0530 | [diff] [blame] | 503 | .id_table = max8973_id, |
| 504 | }; |
| 505 | |
| 506 | static int __init max8973_init(void) |
| 507 | { |
| 508 | return i2c_add_driver(&max8973_i2c_driver); |
| 509 | } |
| 510 | subsys_initcall(max8973_init); |
| 511 | |
| 512 | static void __exit max8973_cleanup(void) |
| 513 | { |
| 514 | i2c_del_driver(&max8973_i2c_driver); |
| 515 | } |
| 516 | module_exit(max8973_cleanup); |
| 517 | |
| 518 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); |
| 519 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); |
| 520 | MODULE_LICENSE("GPL v2"); |