1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // MFD core driver for the Maxim MAX77843 4 // 5 // Copyright (C) 2015 Samsung Electronics 6 // Author: Jaewon Kim <jaewon02.kim@samsung.com> 7 // Author: Beomho Seo <beomho.seo@samsung.com> 8 9 #include <linux/err.h> 10 #include <linux/i2c.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/mfd/core.h> 14 #include <linux/mfd/max77693-common.h> 15 #include <linux/mfd/max77843-private.h> 16 #include <linux/platform_device.h> 17 18 static const struct mfd_cell max77843_devs[] = { 19 { 20 .name = "max77843-muic", 21 .of_compatible = "maxim,max77843-muic", 22 }, { 23 .name = "max77843-regulator", 24 .of_compatible = "maxim,max77843-regulator", 25 }, { 26 .name = "max77843-charger", 27 .of_compatible = "maxim,max77843-charger" 28 }, { 29 .name = "max77843-fuelgauge", 30 .of_compatible = "maxim,max77843-fuelgauge", 31 }, { 32 .name = "max77843-haptic", 33 .of_compatible = "maxim,max77843-haptic", 34 }, 35 }; 36 37 static const struct regmap_config max77843_charger_regmap_config = { 38 .reg_bits = 8, 39 .val_bits = 8, 40 .max_register = MAX77843_CHG_REG_END, 41 }; 42 43 static const struct regmap_config max77843_regmap_config = { 44 .reg_bits = 8, 45 .val_bits = 8, 46 .max_register = MAX77843_SYS_REG_END, 47 }; 48 49 static const struct regmap_irq max77843_irqs[] = { 50 /* TOPSYS interrupts */ 51 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, }, 52 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, }, 53 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, }, 54 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, }, 55 }; 56 57 static const struct regmap_irq_chip max77843_irq_chip = { 58 .name = "max77843", 59 .status_base = MAX77843_SYS_REG_SYSINTSRC, 60 .mask_base = MAX77843_SYS_REG_SYSINTMASK, 61 .num_regs = 1, 62 .irqs = max77843_irqs, 63 .num_irqs = ARRAY_SIZE(max77843_irqs), 64 }; 65 66 /* Charger and Charger regulator use same regmap. */ 67 static int max77843_chg_init(struct max77693_dev *max77843) 68 { 69 int ret; 70 71 max77843->i2c_chg = i2c_new_dummy_device(max77843->i2c->adapter, I2C_ADDR_CHG); 72 if (IS_ERR(max77843->i2c_chg)) { 73 dev_err(&max77843->i2c->dev, 74 "Cannot allocate I2C device for Charger\n"); 75 return PTR_ERR(max77843->i2c_chg); 76 } 77 i2c_set_clientdata(max77843->i2c_chg, max77843); 78 79 max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg, 80 &max77843_charger_regmap_config); 81 if (IS_ERR(max77843->regmap_chg)) { 82 ret = PTR_ERR(max77843->regmap_chg); 83 goto err_chg_i2c; 84 } 85 86 return 0; 87 88 err_chg_i2c: 89 i2c_unregister_device(max77843->i2c_chg); 90 91 return ret; 92 } 93 94 static int max77843_probe(struct i2c_client *i2c) 95 { 96 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 97 struct max77693_dev *max77843; 98 unsigned int reg_data; 99 int ret; 100 101 max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL); 102 if (!max77843) 103 return -ENOMEM; 104 105 i2c_set_clientdata(i2c, max77843); 106 max77843->dev = &i2c->dev; 107 max77843->i2c = i2c; 108 max77843->irq = i2c->irq; 109 max77843->type = id->driver_data; 110 111 max77843->regmap = devm_regmap_init_i2c(i2c, 112 &max77843_regmap_config); 113 if (IS_ERR(max77843->regmap)) { 114 dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); 115 return PTR_ERR(max77843->regmap); 116 } 117 118 ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, 119 IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, 120 0, &max77843_irq_chip, &max77843->irq_data_topsys); 121 if (ret) { 122 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); 123 return ret; 124 } 125 126 ret = regmap_read(max77843->regmap, 127 MAX77843_SYS_REG_PMICID, ®_data); 128 if (ret < 0) { 129 dev_err(&i2c->dev, "Failed to read PMIC ID\n"); 130 goto err_pmic_id; 131 } 132 dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); 133 134 ret = max77843_chg_init(max77843); 135 if (ret) { 136 dev_err(&i2c->dev, "Failed to init Charger\n"); 137 goto err_pmic_id; 138 } 139 140 ret = regmap_update_bits(max77843->regmap, 141 MAX77843_SYS_REG_INTSRCMASK, 142 MAX77843_INTSRC_MASK_MASK, 143 (unsigned int)~MAX77843_INTSRC_MASK_MASK); 144 if (ret < 0) { 145 dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); 146 goto err_pmic_id; 147 } 148 149 ret = mfd_add_devices(max77843->dev, -1, max77843_devs, 150 ARRAY_SIZE(max77843_devs), NULL, 0, NULL); 151 if (ret < 0) { 152 dev_err(&i2c->dev, "Failed to add mfd device\n"); 153 goto err_pmic_id; 154 } 155 156 device_init_wakeup(max77843->dev, true); 157 158 return 0; 159 160 err_pmic_id: 161 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys); 162 163 return ret; 164 } 165 166 static const struct of_device_id max77843_dt_match[] = { 167 { .compatible = "maxim,max77843", }, 168 { }, 169 }; 170 171 static const struct i2c_device_id max77843_id[] = { 172 { "max77843", TYPE_MAX77843, }, 173 { }, 174 }; 175 176 static int __maybe_unused max77843_suspend(struct device *dev) 177 { 178 struct i2c_client *i2c = to_i2c_client(dev); 179 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 180 181 disable_irq(max77843->irq); 182 if (device_may_wakeup(dev)) 183 enable_irq_wake(max77843->irq); 184 185 return 0; 186 } 187 188 static int __maybe_unused max77843_resume(struct device *dev) 189 { 190 struct i2c_client *i2c = to_i2c_client(dev); 191 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 192 193 if (device_may_wakeup(dev)) 194 disable_irq_wake(max77843->irq); 195 enable_irq(max77843->irq); 196 197 return 0; 198 } 199 200 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); 201 202 static struct i2c_driver max77843_i2c_driver = { 203 .driver = { 204 .name = "max77843", 205 .pm = &max77843_pm, 206 .of_match_table = max77843_dt_match, 207 .suppress_bind_attrs = true, 208 }, 209 .probe = max77843_probe, 210 .id_table = max77843_id, 211 }; 212 213 static int __init max77843_i2c_init(void) 214 { 215 return i2c_add_driver(&max77843_i2c_driver); 216 } 217 subsys_initcall(max77843_i2c_init); 218