Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // da9211-regulator.c - Regulator device driver for DA9211/DA9212
0004 // /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
0005 // Copyright (C) 2015  Dialog Semiconductor Ltd.
0006 
0007 #include <linux/err.h>
0008 #include <linux/i2c.h>
0009 #include <linux/module.h>
0010 #include <linux/init.h>
0011 #include <linux/slab.h>
0012 #include <linux/regulator/driver.h>
0013 #include <linux/regulator/machine.h>
0014 #include <linux/regmap.h>
0015 #include <linux/irq.h>
0016 #include <linux/interrupt.h>
0017 #include <linux/gpio/consumer.h>
0018 #include <linux/regulator/of_regulator.h>
0019 #include <linux/regulator/da9211.h>
0020 #include <dt-bindings/regulator/dlg,da9211-regulator.h>
0021 #include "da9211-regulator.h"
0022 
0023 /* DEVICE IDs */
0024 #define DA9211_DEVICE_ID    0x22
0025 #define DA9213_DEVICE_ID    0x23
0026 #define DA9215_DEVICE_ID    0x24
0027 
0028 /* DA9211 REGULATOR IDs */
0029 #define DA9211_ID_BUCKA 0
0030 #define DA9211_ID_BUCKB 1
0031 
0032 struct da9211 {
0033     struct device *dev;
0034     struct regmap *regmap;
0035     struct da9211_pdata *pdata;
0036     struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
0037     int num_regulator;
0038     int chip_irq;
0039     int chip_id;
0040 };
0041 
0042 static const struct regmap_range_cfg da9211_regmap_range[] = {
0043     {
0044         .selector_reg = DA9211_REG_PAGE_CON,
0045         .selector_mask  = DA9211_REG_PAGE_MASK,
0046         .selector_shift = DA9211_REG_PAGE_SHIFT,
0047         .window_start = 0,
0048         .window_len = 256,
0049         .range_min = 0,
0050         .range_max = 5*128,
0051     },
0052 };
0053 
0054 static bool da9211_volatile_reg(struct device *dev, unsigned int reg)
0055 {
0056     switch (reg) {
0057     case DA9211_REG_STATUS_A:
0058     case DA9211_REG_STATUS_B:
0059     case DA9211_REG_EVENT_A:
0060     case DA9211_REG_EVENT_B:
0061         return true;
0062     }
0063     return false;
0064 }
0065 
0066 static const struct regmap_config da9211_regmap_config = {
0067     .reg_bits = 8,
0068     .val_bits = 8,
0069     .max_register = 5 * 128,
0070     .volatile_reg = da9211_volatile_reg,
0071     .cache_type = REGCACHE_RBTREE,
0072     .ranges = da9211_regmap_range,
0073     .num_ranges = ARRAY_SIZE(da9211_regmap_range),
0074 };
0075 
0076 /* Default limits measured in millivolts and milliamps */
0077 #define DA9211_MIN_MV       300
0078 #define DA9211_MAX_MV       1570
0079 #define DA9211_STEP_MV      10
0080 
0081 /* Current limits for DA9211 buck (uA) indices
0082  * corresponds with register values
0083  */
0084 static const int da9211_current_limits[] = {
0085     2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
0086     3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
0087 };
0088 /* Current limits for DA9213 buck (uA) indices
0089  * corresponds with register values
0090  */
0091 static const int da9213_current_limits[] = {
0092     3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
0093     4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
0094 };
0095 /* Current limits for DA9215 buck (uA) indices
0096  * corresponds with register values
0097  */
0098 static const int da9215_current_limits[] = {
0099     4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
0100     5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
0101 };
0102 
0103 static unsigned int da9211_map_buck_mode(unsigned int mode)
0104 {
0105     switch (mode) {
0106     case DA9211_BUCK_MODE_SLEEP:
0107         return REGULATOR_MODE_STANDBY;
0108     case DA9211_BUCK_MODE_SYNC:
0109         return REGULATOR_MODE_FAST;
0110     case DA9211_BUCK_MODE_AUTO:
0111         return REGULATOR_MODE_NORMAL;
0112     default:
0113         return REGULATOR_MODE_INVALID;
0114     }
0115 }
0116 
0117 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
0118 {
0119     int id = rdev_get_id(rdev);
0120     struct da9211 *chip = rdev_get_drvdata(rdev);
0121     unsigned int data;
0122     int ret, mode = 0;
0123 
0124     ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
0125     if (ret < 0)
0126         return ret;
0127 
0128     switch (data & 0x03) {
0129     case DA9211_BUCK_MODE_SYNC:
0130         mode = REGULATOR_MODE_FAST;
0131         break;
0132     case DA9211_BUCK_MODE_AUTO:
0133         mode = REGULATOR_MODE_NORMAL;
0134         break;
0135     case DA9211_BUCK_MODE_SLEEP:
0136         mode = REGULATOR_MODE_STANDBY;
0137         break;
0138     }
0139 
0140     return mode;
0141 }
0142 
0143 static int da9211_buck_set_mode(struct regulator_dev *rdev,
0144                     unsigned int mode)
0145 {
0146     int id = rdev_get_id(rdev);
0147     struct da9211 *chip = rdev_get_drvdata(rdev);
0148     int val = 0;
0149 
0150     switch (mode) {
0151     case REGULATOR_MODE_FAST:
0152         val = DA9211_BUCK_MODE_SYNC;
0153         break;
0154     case REGULATOR_MODE_NORMAL:
0155         val = DA9211_BUCK_MODE_AUTO;
0156         break;
0157     case REGULATOR_MODE_STANDBY:
0158         val = DA9211_BUCK_MODE_SLEEP;
0159         break;
0160     }
0161 
0162     return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
0163                     0x03, val);
0164 }
0165 
0166 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
0167                     int max)
0168 {
0169     int id = rdev_get_id(rdev);
0170     struct da9211 *chip = rdev_get_drvdata(rdev);
0171     int i, max_size;
0172     const int *current_limits;
0173 
0174     switch (chip->chip_id) {
0175     case DA9211:
0176         current_limits = da9211_current_limits;
0177         max_size = ARRAY_SIZE(da9211_current_limits)-1;
0178         break;
0179     case DA9213:
0180         current_limits = da9213_current_limits;
0181         max_size = ARRAY_SIZE(da9213_current_limits)-1;
0182         break;
0183     case DA9215:
0184         current_limits = da9215_current_limits;
0185         max_size = ARRAY_SIZE(da9215_current_limits)-1;
0186         break;
0187     default:
0188         return -EINVAL;
0189     }
0190 
0191     /* search for closest to maximum */
0192     for (i = max_size; i >= 0; i--) {
0193         if (min <= current_limits[i] &&
0194             max >= current_limits[i]) {
0195                 return regmap_update_bits(chip->regmap,
0196                     DA9211_REG_BUCK_ILIM,
0197                     (0x0F << id*4), (i << id*4));
0198         }
0199     }
0200 
0201     return -EINVAL;
0202 }
0203 
0204 static int da9211_get_current_limit(struct regulator_dev *rdev)
0205 {
0206     int id = rdev_get_id(rdev);
0207     struct da9211 *chip = rdev_get_drvdata(rdev);
0208     unsigned int data;
0209     int ret;
0210     const int *current_limits;
0211 
0212     switch (chip->chip_id) {
0213     case DA9211:
0214         current_limits = da9211_current_limits;
0215         break;
0216     case DA9213:
0217         current_limits = da9213_current_limits;
0218         break;
0219     case DA9215:
0220         current_limits = da9215_current_limits;
0221         break;
0222     default:
0223         return -EINVAL;
0224     }
0225 
0226     ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
0227     if (ret < 0)
0228         return ret;
0229 
0230     /* select one of 16 values: 0000 (2000mA or 3000mA)
0231      * to 1111 (5000mA or 6000mA).
0232      */
0233     data = (data >> id*4) & 0x0F;
0234     return current_limits[data];
0235 }
0236 
0237 static const struct regulator_ops da9211_buck_ops = {
0238     .get_mode = da9211_buck_get_mode,
0239     .set_mode = da9211_buck_set_mode,
0240     .enable = regulator_enable_regmap,
0241     .disable = regulator_disable_regmap,
0242     .is_enabled = regulator_is_enabled_regmap,
0243     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0244     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0245     .list_voltage = regulator_list_voltage_linear,
0246     .set_current_limit = da9211_set_current_limit,
0247     .get_current_limit = da9211_get_current_limit,
0248 };
0249 
0250 #define DA9211_BUCK(_id) \
0251 {\
0252     .name = #_id,\
0253     .ops = &da9211_buck_ops,\
0254     .type = REGULATOR_VOLTAGE,\
0255     .id = DA9211_ID_##_id,\
0256     .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
0257     .min_uV = (DA9211_MIN_MV * 1000),\
0258     .uV_step = (DA9211_STEP_MV * 1000),\
0259     .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
0260     .enable_mask = DA9211_BUCKA_EN,\
0261     .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
0262     .vsel_mask = DA9211_VBUCK_MASK,\
0263     .owner = THIS_MODULE,\
0264     .of_map_mode = da9211_map_buck_mode,\
0265 }
0266 
0267 static struct regulator_desc da9211_regulators[] = {
0268     DA9211_BUCK(BUCKA),
0269     DA9211_BUCK(BUCKB),
0270 };
0271 
0272 #ifdef CONFIG_OF
0273 static struct of_regulator_match da9211_matches[] = {
0274     [DA9211_ID_BUCKA] = {
0275         .name = "BUCKA",
0276         .desc = &da9211_regulators[DA9211_ID_BUCKA],
0277     },
0278     [DA9211_ID_BUCKB] = {
0279         .name = "BUCKB",
0280         .desc = &da9211_regulators[DA9211_ID_BUCKB],
0281     },
0282     };
0283 
0284 static struct da9211_pdata *da9211_parse_regulators_dt(
0285         struct device *dev)
0286 {
0287     struct da9211_pdata *pdata;
0288     struct device_node *node;
0289     int i, num, n;
0290 
0291     node = of_get_child_by_name(dev->of_node, "regulators");
0292     if (!node) {
0293         dev_err(dev, "regulators node not found\n");
0294         return ERR_PTR(-ENODEV);
0295     }
0296 
0297     num = of_regulator_match(dev, node, da9211_matches,
0298                  ARRAY_SIZE(da9211_matches));
0299     of_node_put(node);
0300     if (num < 0) {
0301         dev_err(dev, "Failed to match regulators\n");
0302         return ERR_PTR(-EINVAL);
0303     }
0304 
0305     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
0306     if (!pdata)
0307         return ERR_PTR(-ENOMEM);
0308 
0309     pdata->num_buck = num;
0310 
0311     n = 0;
0312     for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
0313         if (!da9211_matches[i].init_data)
0314             continue;
0315 
0316         pdata->init_data[n] = da9211_matches[i].init_data;
0317         pdata->reg_node[n] = da9211_matches[i].of_node;
0318         pdata->gpiod_ren[n] = devm_fwnode_gpiod_get(dev,
0319                     of_fwnode_handle(pdata->reg_node[n]),
0320                     "enable",
0321                     GPIOD_OUT_HIGH |
0322                         GPIOD_FLAGS_BIT_NONEXCLUSIVE,
0323                     "da9211-enable");
0324         if (IS_ERR(pdata->gpiod_ren[n]))
0325             pdata->gpiod_ren[n] = NULL;
0326         n++;
0327     }
0328 
0329     return pdata;
0330 }
0331 #else
0332 static struct da9211_pdata *da9211_parse_regulators_dt(
0333         struct device *dev)
0334 {
0335     return ERR_PTR(-ENODEV);
0336 }
0337 #endif
0338 
0339 static irqreturn_t da9211_irq_handler(int irq, void *data)
0340 {
0341     struct da9211 *chip = data;
0342     int reg_val, err, ret = IRQ_NONE;
0343 
0344     err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
0345     if (err < 0)
0346         goto error_i2c;
0347 
0348     if (reg_val & DA9211_E_OV_CURR_A) {
0349         regulator_notifier_call_chain(chip->rdev[0],
0350             REGULATOR_EVENT_OVER_CURRENT, NULL);
0351 
0352         err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
0353             DA9211_E_OV_CURR_A);
0354         if (err < 0)
0355             goto error_i2c;
0356 
0357         ret = IRQ_HANDLED;
0358     }
0359 
0360     if (reg_val & DA9211_E_OV_CURR_B) {
0361         regulator_notifier_call_chain(chip->rdev[1],
0362             REGULATOR_EVENT_OVER_CURRENT, NULL);
0363 
0364         err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
0365             DA9211_E_OV_CURR_B);
0366         if (err < 0)
0367             goto error_i2c;
0368 
0369         ret = IRQ_HANDLED;
0370     }
0371 
0372     return ret;
0373 
0374 error_i2c:
0375     dev_err(chip->dev, "I2C error : %d\n", err);
0376     return IRQ_NONE;
0377 }
0378 
0379 static int da9211_regulator_init(struct da9211 *chip)
0380 {
0381     struct regulator_config config = { };
0382     int i, ret;
0383     unsigned int data;
0384 
0385     ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
0386     if (ret < 0) {
0387         dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
0388         return ret;
0389     }
0390 
0391     data &= DA9211_SLAVE_SEL;
0392     /* If configuration for 1/2 bucks is different between platform data
0393      * and the register, driver should exit.
0394      */
0395     if (chip->pdata->num_buck == 1 && data == 0x00)
0396         chip->num_regulator = 1;
0397     else if (chip->pdata->num_buck == 2 && data != 0x00)
0398         chip->num_regulator = 2;
0399     else {
0400         dev_err(chip->dev, "Configuration is mismatched\n");
0401         return -EINVAL;
0402     }
0403 
0404     for (i = 0; i < chip->num_regulator; i++) {
0405         config.init_data = chip->pdata->init_data[i];
0406         config.dev = chip->dev;
0407         config.driver_data = chip;
0408         config.regmap = chip->regmap;
0409         config.of_node = chip->pdata->reg_node[i];
0410 
0411         if (chip->pdata->gpiod_ren[i])
0412             config.ena_gpiod = chip->pdata->gpiod_ren[i];
0413         else
0414             config.ena_gpiod = NULL;
0415 
0416         /*
0417          * Hand the GPIO descriptor management over to the regulator
0418          * core, remove it from GPIO devres management.
0419          */
0420         if (config.ena_gpiod)
0421             devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
0422         chip->rdev[i] = devm_regulator_register(chip->dev,
0423             &da9211_regulators[i], &config);
0424         if (IS_ERR(chip->rdev[i])) {
0425             dev_err(chip->dev,
0426                 "Failed to register DA9211 regulator\n");
0427             return PTR_ERR(chip->rdev[i]);
0428         }
0429 
0430         if (chip->chip_irq != 0) {
0431             ret = regmap_update_bits(chip->regmap,
0432                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
0433             if (ret < 0) {
0434                 dev_err(chip->dev,
0435                     "Failed to update mask reg: %d\n", ret);
0436                 return ret;
0437             }
0438         }
0439     }
0440 
0441     return 0;
0442 }
0443 
0444 /*
0445  * I2C driver interface functions
0446  */
0447 static int da9211_i2c_probe(struct i2c_client *i2c)
0448 {
0449     struct da9211 *chip;
0450     int error, ret;
0451     unsigned int data;
0452 
0453     chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
0454     if (!chip)
0455         return -ENOMEM;
0456 
0457     chip->dev = &i2c->dev;
0458     chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
0459     if (IS_ERR(chip->regmap)) {
0460         error = PTR_ERR(chip->regmap);
0461         dev_err(chip->dev, "Failed to allocate register map: %d\n",
0462             error);
0463         return error;
0464     }
0465 
0466     i2c_set_clientdata(i2c, chip);
0467 
0468     chip->pdata = i2c->dev.platform_data;
0469 
0470     ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
0471     if (ret < 0) {
0472         dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
0473         return ret;
0474     }
0475 
0476     switch (data) {
0477     case DA9211_DEVICE_ID:
0478         chip->chip_id = DA9211;
0479         break;
0480     case DA9213_DEVICE_ID:
0481         chip->chip_id = DA9213;
0482         break;
0483     case DA9215_DEVICE_ID:
0484         chip->chip_id = DA9215;
0485         break;
0486     default:
0487         dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
0488         return -ENODEV;
0489     }
0490 
0491     if (!chip->pdata)
0492         chip->pdata = da9211_parse_regulators_dt(chip->dev);
0493 
0494     if (IS_ERR(chip->pdata)) {
0495         dev_err(chip->dev, "No regulators defined for the platform\n");
0496         return PTR_ERR(chip->pdata);
0497     }
0498 
0499     chip->chip_irq = i2c->irq;
0500 
0501     if (chip->chip_irq != 0) {
0502         ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
0503                     da9211_irq_handler,
0504                     IRQF_TRIGGER_LOW|IRQF_ONESHOT,
0505                     "da9211", chip);
0506         if (ret != 0) {
0507             dev_err(chip->dev, "Failed to request IRQ: %d\n",
0508                 chip->chip_irq);
0509             return ret;
0510         }
0511     } else {
0512         dev_warn(chip->dev, "No IRQ configured\n");
0513     }
0514 
0515     ret = da9211_regulator_init(chip);
0516 
0517     if (ret < 0)
0518         dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
0519 
0520     return ret;
0521 }
0522 
0523 static const struct i2c_device_id da9211_i2c_id[] = {
0524     {"da9211", DA9211},
0525     {"da9212", DA9212},
0526     {"da9213", DA9213},
0527     {"da9223", DA9223},
0528     {"da9214", DA9214},
0529     {"da9224", DA9224},
0530     {"da9215", DA9215},
0531     {"da9225", DA9225},
0532     {},
0533 };
0534 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
0535 
0536 #ifdef CONFIG_OF
0537 static const struct of_device_id da9211_dt_ids[] = {
0538     { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
0539     { .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
0540     { .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
0541     { .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
0542     { .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
0543     { .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
0544     { .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
0545     { .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
0546     {},
0547 };
0548 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
0549 #endif
0550 
0551 static struct i2c_driver da9211_regulator_driver = {
0552     .driver = {
0553         .name = "da9211",
0554         .of_match_table = of_match_ptr(da9211_dt_ids),
0555     },
0556     .probe_new = da9211_i2c_probe,
0557     .id_table = da9211_i2c_id,
0558 };
0559 
0560 module_i2c_driver(da9211_regulator_driver);
0561 
0562 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
0563 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
0564 MODULE_LICENSE("GPL");
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!