drivers/mfd/max77843.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // MFD core driver for the Maxim MAX77843
0004 //
0005 // Copyright (C) 2015 Samsung Electronics
0006 // Author: Jaewon Kim <jaewon02.kim@samsung.com>
0007 // Author: Beomho Seo <beomho.seo@samsung.com>
0008
0009 #include <linux/err.h>
0010 #include <linux/i2c.h>
0011 #include <linux/init.h>
0012 #include <linux/interrupt.h>
0013 #include <linux/mfd/core.h>
0014 #include <linux/mfd/max77693-common.h>
0015 #include <linux/mfd/max77843-private.h>
0016 #include <linux/of_device.h>
0017 #include <linux/platform_device.h>
0018
0019 static const struct mfd_cell max77843_devs[] = {
0020     {
0021         .name = "max77843-muic",
0022         .of_compatible = "maxim,max77843-muic",
0023     }, {
0024         .name = "max77843-regulator",
0025         .of_compatible = "maxim,max77843-regulator",
0026     }, {
0027         .name = "max77843-charger",
0028         .of_compatible = "maxim,max77843-charger"
0029     }, {
0030         .name = "max77843-fuelgauge",
0031         .of_compatible = "maxim,max77843-fuelgauge",
0032     }, {
0033         .name = "max77843-haptic",
0034         .of_compatible = "maxim,max77843-haptic",
0035     },
0036 };
0037
0038 static const struct regmap_config max77843_charger_regmap_config = {
0039     .reg_bits   = 8,
0040     .val_bits   = 8,
0041     .max_register   = MAX77843_CHG_REG_END,
0042 };
0043
0044 static const struct regmap_config max77843_regmap_config = {
0045     .reg_bits   = 8,
0046     .val_bits   = 8,
0047     .max_register   = MAX77843_SYS_REG_END,
0048 };
0049
0050 static const struct regmap_irq max77843_irqs[] = {
0051     /* TOPSYS interrupts */
0052     { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
0053     { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
0054     { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
0055     { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
0056 };
0057
0058 static const struct regmap_irq_chip max77843_irq_chip = {
0059     .name       = "max77843",
0060     .status_base    = MAX77843_SYS_REG_SYSINTSRC,
0061     .mask_base  = MAX77843_SYS_REG_SYSINTMASK,
0062     .mask_invert    = false,
0063     .num_regs   = 1,
0064     .irqs       = max77843_irqs,
0065     .num_irqs   = ARRAY_SIZE(max77843_irqs),
0066 };
0067
0068 /* Charger and Charger regulator use same regmap. */
0069 static int max77843_chg_init(struct max77693_dev *max77843)
0070 {
0071     int ret;
0072
0073     max77843->i2c_chg = i2c_new_dummy_device(max77843->i2c->adapter, I2C_ADDR_CHG);
0074     if (IS_ERR(max77843->i2c_chg)) {
0075         dev_err(&max77843->i2c->dev,
0076                 "Cannot allocate I2C device for Charger\n");
0077         return PTR_ERR(max77843->i2c_chg);
0078     }
0079     i2c_set_clientdata(max77843->i2c_chg, max77843);
0080
0081     max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
0082             &max77843_charger_regmap_config);
0083     if (IS_ERR(max77843->regmap_chg)) {
0084         ret = PTR_ERR(max77843->regmap_chg);
0085         goto err_chg_i2c;
0086     }
0087
0088     return 0;
0089
0090 err_chg_i2c:
0091     i2c_unregister_device(max77843->i2c_chg);
0092
0093     return ret;
0094 }
0095
0096 static int max77843_probe(struct i2c_client *i2c,
0097               const struct i2c_device_id *id)
0098 {
0099     struct max77693_dev *max77843;
0100     unsigned int reg_data;
0101     int ret;
0102
0103     max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
0104     if (!max77843)
0105         return -ENOMEM;
0106
0107     i2c_set_clientdata(i2c, max77843);
0108     max77843->dev = &i2c->dev;
0109     max77843->i2c = i2c;
0110     max77843->irq = i2c->irq;
0111     max77843->type = id->driver_data;
0112
0113     max77843->regmap = devm_regmap_init_i2c(i2c,
0114             &max77843_regmap_config);
0115     if (IS_ERR(max77843->regmap)) {
0116         dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
0117         return PTR_ERR(max77843->regmap);
0118     }
0119
0120     ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
0121             IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
0122             0, &max77843_irq_chip, &max77843->irq_data_topsys);
0123     if (ret) {
0124         dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
0125         return ret;
0126     }
0127
0128     ret = regmap_read(max77843->regmap,
0129             MAX77843_SYS_REG_PMICID, &reg_data);
0130     if (ret < 0) {
0131         dev_err(&i2c->dev, "Failed to read PMIC ID\n");
0132         goto err_pmic_id;
0133     }
0134     dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
0135
0136     ret = max77843_chg_init(max77843);
0137     if (ret) {
0138         dev_err(&i2c->dev, "Failed to init Charger\n");
0139         goto err_pmic_id;
0140     }
0141
0142     ret = regmap_update_bits(max77843->regmap,
0143                  MAX77843_SYS_REG_INTSRCMASK,
0144                  MAX77843_INTSRC_MASK_MASK,
0145                  (unsigned int)~MAX77843_INTSRC_MASK_MASK);
0146     if (ret < 0) {
0147         dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
0148         goto err_pmic_id;
0149     }
0150
0151     ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
0152                   ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
0153     if (ret < 0) {
0154         dev_err(&i2c->dev, "Failed to add mfd device\n");
0155         goto err_pmic_id;
0156     }
0157
0158     device_init_wakeup(max77843->dev, true);
0159
0160     return 0;
0161
0162 err_pmic_id:
0163     regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
0164
0165     return ret;
0166 }
0167
0168 static const struct of_device_id max77843_dt_match[] = {
0169     { .compatible = "maxim,max77843", },
0170     { },
0171 };
0172
0173 static const struct i2c_device_id max77843_id[] = {
0174     { "max77843", TYPE_MAX77843, },
0175     { },
0176 };
0177
0178 static int __maybe_unused max77843_suspend(struct device *dev)
0179 {
0180     struct i2c_client *i2c = to_i2c_client(dev);
0181     struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
0182
0183     disable_irq(max77843->irq);
0184     if (device_may_wakeup(dev))
0185         enable_irq_wake(max77843->irq);
0186
0187     return 0;
0188 }
0189
0190 static int __maybe_unused max77843_resume(struct device *dev)
0191 {
0192     struct i2c_client *i2c = to_i2c_client(dev);
0193     struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
0194
0195     if (device_may_wakeup(dev))
0196         disable_irq_wake(max77843->irq);
0197     enable_irq(max77843->irq);
0198
0199     return 0;
0200 }
0201
0202 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
0203
0204 static struct i2c_driver max77843_i2c_driver = {
0205     .driver = {
0206         .name = "max77843",
0207         .pm = &max77843_pm,
0208         .of_match_table = max77843_dt_match,
0209         .suppress_bind_attrs = true,
0210     },
0211     .probe = max77843_probe,
0212     .id_table = max77843_id,
0213 };
0214
0215 static int __init max77843_i2c_init(void)
0216 {
0217     return i2c_add_driver(&max77843_i2c_driver);
0218 }
0219 subsys_initcall(max77843_i2c_init);