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0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // max14577.c - mfd core driver for the Maxim 14577/77836
0004 //
0005 // Copyright (C) 2014 Samsung Electronics
0006 // Chanwoo Choi <cw00.choi@samsung.com>
0007 // Krzysztof Kozlowski <krzk@kernel.org>
0008 //
0009 // This driver is based on max8997.c
0010 
0011 #include <linux/err.h>
0012 #include <linux/module.h>
0013 #include <linux/interrupt.h>
0014 #include <linux/of_device.h>
0015 #include <linux/mfd/core.h>
0016 #include <linux/mfd/max14577.h>
0017 #include <linux/mfd/max14577-private.h>
0018 
0019 /*
0020  * Table of valid charger currents for different Maxim chipsets.
0021  * It is placed here because it is used by both charger and regulator driver.
0022  */
0023 const struct maxim_charger_current maxim_charger_currents[] = {
0024     [MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
0025     [MAXIM_DEVICE_TYPE_MAX14577] = {
0026         .min        = MAX14577_CHARGER_CURRENT_LIMIT_MIN,
0027         .high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START,
0028         .high_step  = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP,
0029         .max        = MAX14577_CHARGER_CURRENT_LIMIT_MAX,
0030     },
0031     [MAXIM_DEVICE_TYPE_MAX77836] = {
0032         .min        = MAX77836_CHARGER_CURRENT_LIMIT_MIN,
0033         .high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START,
0034         .high_step  = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP,
0035         .max        = MAX77836_CHARGER_CURRENT_LIMIT_MAX,
0036     },
0037 };
0038 EXPORT_SYMBOL_GPL(maxim_charger_currents);
0039 
0040 /*
0041  * maxim_charger_calc_reg_current - Calculate register value for current
0042  * @limits: constraints for charger, matching the MBCICHWRC register
0043  * @min_ua: minimal requested current, micro Amps
0044  * @max_ua: maximum requested current, micro Amps
0045  * @dst:    destination to store calculated register value
0046  *
0047  * Calculates the value of MBCICHWRC (Fast Battery Charge Current) register
0048  * for given current and stores it under pointed 'dst'. The stored value
0049  * combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also
0050  * properly shifted.
0051  *
0052  * The calculated register value matches the current which:
0053  *  - is always between <limits.min, limits.max>;
0054  *  - is always less or equal to max_ua;
0055  *  - is the highest possible value;
0056  *  - may be lower than min_ua.
0057  *
0058  * On success returns 0. On error returns -EINVAL (requested min/max current
0059  * is outside of given charger limits) and 'dst' is not set.
0060  */
0061 int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
0062         unsigned int min_ua, unsigned int max_ua, u8 *dst)
0063 {
0064     unsigned int current_bits;
0065 
0066     if (min_ua > max_ua)
0067         return -EINVAL;
0068 
0069     if (min_ua > limits->max || max_ua < limits->min)
0070         return -EINVAL;
0071 
0072     if (max_ua < limits->high_start) {
0073         /*
0074          * Less than high_start, so set the minimal current
0075          * (turn Low Bit off, 0 as high bits).
0076          */
0077         *dst = 0x0;
0078         return 0;
0079     }
0080 
0081     /* max_ua is in range: <high_start, infinite>, cut it to limits.max */
0082     max_ua = min(limits->max, max_ua);
0083     max_ua -= limits->high_start;
0084     /*
0085      * There is no risk of overflow 'max_ua' here because:
0086      *  - max_ua >= limits.high_start
0087      *  - BUILD_BUG checks that 'limits' are: max >= high_start + high_step
0088      */
0089     current_bits = max_ua / limits->high_step;
0090 
0091     /* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */
0092     *dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
0093     /* and set proper High Bits */
0094     *dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
0095 
0096     return 0;
0097 }
0098 EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current);
0099 
0100 static const struct mfd_cell max14577_devs[] = {
0101     {
0102         .name = "max14577-muic",
0103         .of_compatible = "maxim,max14577-muic",
0104     },
0105     {
0106         .name = "max14577-regulator",
0107         .of_compatible = "maxim,max14577-regulator",
0108     },
0109     {
0110         .name = "max14577-charger",
0111         .of_compatible = "maxim,max14577-charger",
0112     },
0113 };
0114 
0115 static const struct mfd_cell max77836_devs[] = {
0116     {
0117         .name = "max77836-muic",
0118         .of_compatible = "maxim,max77836-muic",
0119     },
0120     {
0121         .name = "max77836-regulator",
0122         .of_compatible = "maxim,max77836-regulator",
0123     },
0124     {
0125         .name = "max77836-charger",
0126         .of_compatible = "maxim,max77836-charger",
0127     },
0128     {
0129         .name = "max77836-battery",
0130         .of_compatible = "maxim,max77836-battery",
0131     },
0132 };
0133 
0134 static const struct of_device_id max14577_dt_match[] = {
0135     {
0136         .compatible = "maxim,max14577",
0137         .data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
0138     },
0139     {
0140         .compatible = "maxim,max77836",
0141         .data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
0142     },
0143     {},
0144 };
0145 
0146 static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
0147 {
0148     switch (reg) {
0149     case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
0150         return true;
0151     default:
0152         break;
0153     }
0154     return false;
0155 }
0156 
0157 static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
0158 {
0159     /* Any max14577 volatile registers are also max77836 volatile. */
0160     if (max14577_muic_volatile_reg(dev, reg))
0161         return true;
0162 
0163     switch (reg) {
0164     case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
0165     case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
0166     case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
0167     case MAX77836_PMIC_REG_INTSRC:
0168     case MAX77836_PMIC_REG_TOPSYS_INT:
0169     case MAX77836_PMIC_REG_TOPSYS_STAT:
0170         return true;
0171     default:
0172         break;
0173     }
0174     return false;
0175 }
0176 
0177 static const struct regmap_config max14577_muic_regmap_config = {
0178     .reg_bits   = 8,
0179     .val_bits   = 8,
0180     .volatile_reg   = max14577_muic_volatile_reg,
0181     .max_register   = MAX14577_REG_END,
0182 };
0183 
0184 static const struct regmap_config max77836_pmic_regmap_config = {
0185     .reg_bits   = 8,
0186     .val_bits   = 8,
0187     .volatile_reg   = max77836_muic_volatile_reg,
0188     .max_register   = MAX77836_PMIC_REG_END,
0189 };
0190 
0191 static const struct regmap_irq max14577_irqs[] = {
0192     /* INT1 interrupts */
0193     { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
0194     { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
0195     { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
0196     /* INT2 interrupts */
0197     { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
0198     { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
0199     { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
0200     { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
0201     { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
0202     /* INT3 interrupts */
0203     { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
0204     { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
0205     { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
0206     { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
0207 };
0208 
0209 static const struct regmap_irq_chip max14577_irq_chip = {
0210     .name           = "max14577",
0211     .status_base        = MAX14577_REG_INT1,
0212     .mask_base      = MAX14577_REG_INTMASK1,
0213     .mask_invert        = true,
0214     .num_regs       = 3,
0215     .irqs           = max14577_irqs,
0216     .num_irqs       = ARRAY_SIZE(max14577_irqs),
0217 };
0218 
0219 static const struct regmap_irq max77836_muic_irqs[] = {
0220     /* INT1 interrupts */
0221     { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
0222     { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
0223     { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
0224     { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
0225     /* INT2 interrupts */
0226     { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
0227     { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
0228     { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
0229     { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
0230     { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
0231     { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
0232     /* INT3 interrupts */
0233     { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
0234     { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
0235     { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
0236     { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
0237 };
0238 
0239 static const struct regmap_irq_chip max77836_muic_irq_chip = {
0240     .name           = "max77836-muic",
0241     .status_base        = MAX14577_REG_INT1,
0242     .mask_base      = MAX14577_REG_INTMASK1,
0243     .mask_invert        = true,
0244     .num_regs       = 3,
0245     .irqs           = max77836_muic_irqs,
0246     .num_irqs       = ARRAY_SIZE(max77836_muic_irqs),
0247 };
0248 
0249 static const struct regmap_irq max77836_pmic_irqs[] = {
0250     { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
0251     { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
0252 };
0253 
0254 static const struct regmap_irq_chip max77836_pmic_irq_chip = {
0255     .name           = "max77836-pmic",
0256     .status_base        = MAX77836_PMIC_REG_TOPSYS_INT,
0257     .mask_base      = MAX77836_PMIC_REG_TOPSYS_INT_MASK,
0258     .mask_invert        = false,
0259     .num_regs       = 1,
0260     .irqs           = max77836_pmic_irqs,
0261     .num_irqs       = ARRAY_SIZE(max77836_pmic_irqs),
0262 };
0263 
0264 static void max14577_print_dev_type(struct max14577 *max14577)
0265 {
0266     u8 reg_data, vendor_id, device_id;
0267     int ret;
0268 
0269     ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
0270             &reg_data);
0271     if (ret) {
0272         dev_err(max14577->dev,
0273             "Failed to read DEVICEID register: %d\n", ret);
0274         return;
0275     }
0276 
0277     vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
0278                 DEVID_VENDORID_SHIFT);
0279     device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
0280                 DEVID_DEVICEID_SHIFT);
0281 
0282     dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
0283             max14577->dev_type, device_id, vendor_id);
0284 }
0285 
0286 /*
0287  * Max77836 specific initialization code for driver probe.
0288  * Adds new I2C dummy device, regmap and regmap IRQ chip.
0289  * Unmasks Interrupt Source register.
0290  *
0291  * On success returns 0.
0292  * On failure returns errno and reverts any changes done so far (e.g. remove
0293  * I2C dummy device), except masking the INT SRC register.
0294  */
0295 static int max77836_init(struct max14577 *max14577)
0296 {
0297     int ret;
0298     u8 intsrc_mask;
0299 
0300     max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter,
0301             I2C_ADDR_PMIC);
0302     if (IS_ERR(max14577->i2c_pmic)) {
0303         dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
0304         return PTR_ERR(max14577->i2c_pmic);
0305     }
0306     i2c_set_clientdata(max14577->i2c_pmic, max14577);
0307 
0308     max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
0309             &max77836_pmic_regmap_config);
0310     if (IS_ERR(max14577->regmap_pmic)) {
0311         ret = PTR_ERR(max14577->regmap_pmic);
0312         dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
0313                 ret);
0314         goto err;
0315     }
0316 
0317     /* Un-mask MAX77836 Interrupt Source register */
0318     ret = max14577_read_reg(max14577->regmap_pmic,
0319             MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
0320     if (ret < 0) {
0321         dev_err(max14577->dev, "Failed to read PMIC register\n");
0322         goto err;
0323     }
0324 
0325     intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
0326     intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
0327     ret = max14577_write_reg(max14577->regmap_pmic,
0328             MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
0329     if (ret < 0) {
0330         dev_err(max14577->dev, "Failed to write PMIC register\n");
0331         goto err;
0332     }
0333 
0334     ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
0335             IRQF_ONESHOT | IRQF_SHARED,
0336             0, &max77836_pmic_irq_chip,
0337             &max14577->irq_data_pmic);
0338     if (ret != 0) {
0339         dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
0340                 max14577->irq, ret);
0341         goto err;
0342     }
0343 
0344     return 0;
0345 
0346 err:
0347     i2c_unregister_device(max14577->i2c_pmic);
0348 
0349     return ret;
0350 }
0351 
0352 /*
0353  * Max77836 specific de-initialization code for driver remove.
0354  */
0355 static void max77836_remove(struct max14577 *max14577)
0356 {
0357     regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
0358     i2c_unregister_device(max14577->i2c_pmic);
0359 }
0360 
0361 static int max14577_i2c_probe(struct i2c_client *i2c,
0362                   const struct i2c_device_id *id)
0363 {
0364     struct max14577 *max14577;
0365     struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
0366     struct device_node *np = i2c->dev.of_node;
0367     int ret = 0;
0368     const struct regmap_irq_chip *irq_chip;
0369     const struct mfd_cell *mfd_devs;
0370     unsigned int mfd_devs_size;
0371     int irq_flags;
0372 
0373     if (np) {
0374         pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
0375         if (!pdata)
0376             return -ENOMEM;
0377         i2c->dev.platform_data = pdata;
0378     }
0379 
0380     if (!pdata) {
0381         dev_err(&i2c->dev, "No platform data found.\n");
0382         return -EINVAL;
0383     }
0384 
0385     max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
0386     if (!max14577)
0387         return -ENOMEM;
0388 
0389     i2c_set_clientdata(i2c, max14577);
0390     max14577->dev = &i2c->dev;
0391     max14577->i2c = i2c;
0392     max14577->irq = i2c->irq;
0393 
0394     max14577->regmap = devm_regmap_init_i2c(i2c,
0395             &max14577_muic_regmap_config);
0396     if (IS_ERR(max14577->regmap)) {
0397         ret = PTR_ERR(max14577->regmap);
0398         dev_err(max14577->dev, "Failed to allocate register map: %d\n",
0399                 ret);
0400         return ret;
0401     }
0402 
0403     if (np) {
0404         const struct of_device_id *of_id;
0405 
0406         of_id = of_match_device(max14577_dt_match, &i2c->dev);
0407         if (of_id)
0408             max14577->dev_type =
0409                 (enum maxim_device_type)of_id->data;
0410     } else {
0411         max14577->dev_type = id->driver_data;
0412     }
0413 
0414     max14577_print_dev_type(max14577);
0415 
0416     switch (max14577->dev_type) {
0417     case MAXIM_DEVICE_TYPE_MAX77836:
0418         irq_chip = &max77836_muic_irq_chip;
0419         mfd_devs = max77836_devs;
0420         mfd_devs_size = ARRAY_SIZE(max77836_devs);
0421         irq_flags = IRQF_ONESHOT | IRQF_SHARED;
0422         break;
0423     case MAXIM_DEVICE_TYPE_MAX14577:
0424     default:
0425         irq_chip = &max14577_irq_chip;
0426         mfd_devs = max14577_devs;
0427         mfd_devs_size = ARRAY_SIZE(max14577_devs);
0428         irq_flags = IRQF_ONESHOT;
0429         break;
0430     }
0431 
0432     ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
0433                   irq_flags, 0, irq_chip,
0434                   &max14577->irq_data);
0435     if (ret != 0) {
0436         dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
0437                 max14577->irq, ret);
0438         return ret;
0439     }
0440 
0441     /* Max77836 specific initialization code (additional regmap) */
0442     if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
0443         ret = max77836_init(max14577);
0444         if (ret < 0)
0445             goto err_max77836;
0446     }
0447 
0448     ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
0449             mfd_devs_size, NULL, 0, NULL);
0450     if (ret < 0)
0451         goto err_mfd;
0452 
0453     device_init_wakeup(max14577->dev, 1);
0454 
0455     return 0;
0456 
0457 err_mfd:
0458     if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
0459         max77836_remove(max14577);
0460 err_max77836:
0461     regmap_del_irq_chip(max14577->irq, max14577->irq_data);
0462 
0463     return ret;
0464 }
0465 
0466 static int max14577_i2c_remove(struct i2c_client *i2c)
0467 {
0468     struct max14577 *max14577 = i2c_get_clientdata(i2c);
0469 
0470     mfd_remove_devices(max14577->dev);
0471     regmap_del_irq_chip(max14577->irq, max14577->irq_data);
0472     if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
0473         max77836_remove(max14577);
0474 
0475     return 0;
0476 }
0477 
0478 static const struct i2c_device_id max14577_i2c_id[] = {
0479     { "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
0480     { "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
0481     { }
0482 };
0483 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
0484 
0485 #ifdef CONFIG_PM_SLEEP
0486 static int max14577_suspend(struct device *dev)
0487 {
0488     struct i2c_client *i2c = to_i2c_client(dev);
0489     struct max14577 *max14577 = i2c_get_clientdata(i2c);
0490 
0491     if (device_may_wakeup(dev))
0492         enable_irq_wake(max14577->irq);
0493     /*
0494      * MUIC IRQ must be disabled during suspend because if it happens
0495      * while suspended it will be handled before resuming I2C.
0496      *
0497      * When device is woken up from suspend (e.g. by ADC change),
0498      * an interrupt occurs before resuming I2C bus controller.
0499      * Interrupt handler tries to read registers but this read
0500      * will fail because I2C is still suspended.
0501      */
0502     disable_irq(max14577->irq);
0503 
0504     return 0;
0505 }
0506 
0507 static int max14577_resume(struct device *dev)
0508 {
0509     struct i2c_client *i2c = to_i2c_client(dev);
0510     struct max14577 *max14577 = i2c_get_clientdata(i2c);
0511 
0512     if (device_may_wakeup(dev))
0513         disable_irq_wake(max14577->irq);
0514     enable_irq(max14577->irq);
0515 
0516     return 0;
0517 }
0518 #endif /* CONFIG_PM_SLEEP */
0519 
0520 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
0521 
0522 static struct i2c_driver max14577_i2c_driver = {
0523     .driver = {
0524         .name = "max14577",
0525         .pm = &max14577_pm,
0526         .of_match_table = max14577_dt_match,
0527     },
0528     .probe = max14577_i2c_probe,
0529     .remove = max14577_i2c_remove,
0530     .id_table = max14577_i2c_id,
0531 };
0532 
0533 static int __init max14577_i2c_init(void)
0534 {
0535     BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
0536     BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
0537 
0538     /* Valid charger current values must be provided for each chipset */
0539     BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);
0540 
0541     /* Check for valid values for charger */
0542     BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START +
0543             MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
0544             MAX14577_CHARGER_CURRENT_LIMIT_MAX);
0545     BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
0546 
0547     BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START +
0548             MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
0549             MAX77836_CHARGER_CURRENT_LIMIT_MAX);
0550     BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
0551 
0552     return i2c_add_driver(&max14577_i2c_driver);
0553 }
0554 module_init(max14577_i2c_init);
0555 
0556 static void __exit max14577_i2c_exit(void)
0557 {
0558     i2c_del_driver(&max14577_i2c_driver);
0559 }
0560 module_exit(max14577_i2c_exit);
0561 
0562 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
0563 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
0564 MODULE_LICENSE("GPL");
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