1 /* 2 * MFD core driver for the Maxim MAX77843 3 * 4 * Copyright (C) 2015 Samsung Electronics 5 * Author: Jaewon Kim <jaewon02.kim@samsung.com> 6 * Author: Beomho Seo <beomho.seo@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/err.h> 15 #include <linux/i2c.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/mfd/core.h> 19 #include <linux/mfd/max77693-common.h> 20 #include <linux/mfd/max77843-private.h> 21 #include <linux/of_device.h> 22 #include <linux/platform_device.h> 23 24 static const struct mfd_cell max77843_devs[] = { 25 { 26 .name = "max77843-muic", 27 .of_compatible = "maxim,max77843-muic", 28 }, { 29 .name = "max77843-regulator", 30 .of_compatible = "maxim,max77843-regulator", 31 }, { 32 .name = "max77843-charger", 33 .of_compatible = "maxim,max77843-charger" 34 }, { 35 .name = "max77843-fuelgauge", 36 .of_compatible = "maxim,max77843-fuelgauge", 37 }, { 38 .name = "max77843-haptic", 39 .of_compatible = "maxim,max77843-haptic", 40 }, 41 }; 42 43 static const struct regmap_config max77843_charger_regmap_config = { 44 .reg_bits = 8, 45 .val_bits = 8, 46 .max_register = MAX77843_CHG_REG_END, 47 }; 48 49 static const struct regmap_config max77843_regmap_config = { 50 .reg_bits = 8, 51 .val_bits = 8, 52 .max_register = MAX77843_SYS_REG_END, 53 }; 54 55 static const struct regmap_irq max77843_irqs[] = { 56 /* TOPSYS interrupts */ 57 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, }, 58 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, }, 59 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, }, 60 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, }, 61 }; 62 63 static const struct regmap_irq_chip max77843_irq_chip = { 64 .name = "max77843", 65 .status_base = MAX77843_SYS_REG_SYSINTSRC, 66 .mask_base = MAX77843_SYS_REG_SYSINTMASK, 67 .mask_invert = false, 68 .num_regs = 1, 69 .irqs = max77843_irqs, 70 .num_irqs = ARRAY_SIZE(max77843_irqs), 71 }; 72 73 /* Charger and Charger regulator use same regmap. */ 74 static int max77843_chg_init(struct max77693_dev *max77843) 75 { 76 int ret; 77 78 max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG); 79 if (!max77843->i2c_chg) { 80 dev_err(&max77843->i2c->dev, 81 "Cannot allocate I2C device for Charger\n"); 82 return -ENODEV; 83 } 84 i2c_set_clientdata(max77843->i2c_chg, max77843); 85 86 max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg, 87 &max77843_charger_regmap_config); 88 if (IS_ERR(max77843->regmap_chg)) { 89 ret = PTR_ERR(max77843->regmap_chg); 90 goto err_chg_i2c; 91 } 92 93 return 0; 94 95 err_chg_i2c: 96 i2c_unregister_device(max77843->i2c_chg); 97 98 return ret; 99 } 100 101 static int max77843_probe(struct i2c_client *i2c, 102 const struct i2c_device_id *id) 103 { 104 struct max77693_dev *max77843; 105 unsigned int reg_data; 106 int ret; 107 108 max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL); 109 if (!max77843) 110 return -ENOMEM; 111 112 i2c_set_clientdata(i2c, max77843); 113 max77843->dev = &i2c->dev; 114 max77843->i2c = i2c; 115 max77843->irq = i2c->irq; 116 max77843->type = id->driver_data; 117 118 max77843->regmap = devm_regmap_init_i2c(i2c, 119 &max77843_regmap_config); 120 if (IS_ERR(max77843->regmap)) { 121 dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); 122 return PTR_ERR(max77843->regmap); 123 } 124 125 ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, 126 IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, 127 0, &max77843_irq_chip, &max77843->irq_data_topsys); 128 if (ret) { 129 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); 130 return ret; 131 } 132 133 ret = regmap_read(max77843->regmap, 134 MAX77843_SYS_REG_PMICID, ®_data); 135 if (ret < 0) { 136 dev_err(&i2c->dev, "Failed to read PMIC ID\n"); 137 goto err_pmic_id; 138 } 139 dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); 140 141 ret = max77843_chg_init(max77843); 142 if (ret) { 143 dev_err(&i2c->dev, "Failed to init Charger\n"); 144 goto err_pmic_id; 145 } 146 147 ret = regmap_update_bits(max77843->regmap, 148 MAX77843_SYS_REG_INTSRCMASK, 149 MAX77843_INTSRC_MASK_MASK, 150 (unsigned int)~MAX77843_INTSRC_MASK_MASK); 151 if (ret < 0) { 152 dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); 153 goto err_pmic_id; 154 } 155 156 ret = mfd_add_devices(max77843->dev, -1, max77843_devs, 157 ARRAY_SIZE(max77843_devs), NULL, 0, NULL); 158 if (ret < 0) { 159 dev_err(&i2c->dev, "Failed to add mfd device\n"); 160 goto err_pmic_id; 161 } 162 163 device_init_wakeup(max77843->dev, true); 164 165 return 0; 166 167 err_pmic_id: 168 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys); 169 170 return ret; 171 } 172 173 static const struct of_device_id max77843_dt_match[] = { 174 { .compatible = "maxim,max77843", }, 175 { }, 176 }; 177 178 static const struct i2c_device_id max77843_id[] = { 179 { "max77843", TYPE_MAX77843, }, 180 { }, 181 }; 182 183 static int __maybe_unused max77843_suspend(struct device *dev) 184 { 185 struct i2c_client *i2c = to_i2c_client(dev); 186 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 187 188 disable_irq(max77843->irq); 189 if (device_may_wakeup(dev)) 190 enable_irq_wake(max77843->irq); 191 192 return 0; 193 } 194 195 static int __maybe_unused max77843_resume(struct device *dev) 196 { 197 struct i2c_client *i2c = to_i2c_client(dev); 198 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 199 200 if (device_may_wakeup(dev)) 201 disable_irq_wake(max77843->irq); 202 enable_irq(max77843->irq); 203 204 return 0; 205 } 206 207 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); 208 209 static struct i2c_driver max77843_i2c_driver = { 210 .driver = { 211 .name = "max77843", 212 .pm = &max77843_pm, 213 .of_match_table = max77843_dt_match, 214 .suppress_bind_attrs = true, 215 }, 216 .probe = max77843_probe, 217 .id_table = max77843_id, 218 }; 219 220 static int __init max77843_i2c_init(void) 221 { 222 return i2c_add_driver(&max77843_i2c_driver); 223 } 224 subsys_initcall(max77843_i2c_init); 225