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/module.h> 19 #include <linux/mfd/core.h> 20 #include <linux/mfd/max77693-common.h> 21 #include <linux/mfd/max77843-private.h> 22 #include <linux/of_device.h> 23 #include <linux/platform_device.h> 24 25 static const struct mfd_cell max77843_devs[] = { 26 { 27 .name = "max77843-muic", 28 .of_compatible = "maxim,max77843-muic", 29 }, { 30 .name = "max77843-regulator", 31 .of_compatible = "maxim,max77843-regulator", 32 }, { 33 .name = "max77843-charger", 34 .of_compatible = "maxim,max77843-charger" 35 }, { 36 .name = "max77843-fuelgauge", 37 .of_compatible = "maxim,max77843-fuelgauge", 38 }, { 39 .name = "max77843-haptic", 40 .of_compatible = "maxim,max77843-haptic", 41 }, 42 }; 43 44 static const struct regmap_config max77843_charger_regmap_config = { 45 .reg_bits = 8, 46 .val_bits = 8, 47 .max_register = MAX77843_CHG_REG_END, 48 }; 49 50 static const struct regmap_config max77843_regmap_config = { 51 .reg_bits = 8, 52 .val_bits = 8, 53 .max_register = MAX77843_SYS_REG_END, 54 }; 55 56 static const struct regmap_irq max77843_irqs[] = { 57 /* TOPSYS interrupts */ 58 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, }, 59 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, }, 60 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, }, 61 { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, }, 62 }; 63 64 static const struct regmap_irq_chip max77843_irq_chip = { 65 .name = "max77843", 66 .status_base = MAX77843_SYS_REG_SYSINTSRC, 67 .mask_base = MAX77843_SYS_REG_SYSINTMASK, 68 .mask_invert = false, 69 .num_regs = 1, 70 .irqs = max77843_irqs, 71 .num_irqs = ARRAY_SIZE(max77843_irqs), 72 }; 73 74 /* Charger and Charger regulator use same regmap. */ 75 static int max77843_chg_init(struct max77693_dev *max77843) 76 { 77 int ret; 78 79 max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG); 80 if (!max77843->i2c_chg) { 81 dev_err(&max77843->i2c->dev, 82 "Cannot allocate I2C device for Charger\n"); 83 return -ENODEV; 84 } 85 i2c_set_clientdata(max77843->i2c_chg, max77843); 86 87 max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg, 88 &max77843_charger_regmap_config); 89 if (IS_ERR(max77843->regmap_chg)) { 90 ret = PTR_ERR(max77843->regmap_chg); 91 goto err_chg_i2c; 92 } 93 94 return 0; 95 96 err_chg_i2c: 97 i2c_unregister_device(max77843->i2c_chg); 98 99 return ret; 100 } 101 102 static int max77843_probe(struct i2c_client *i2c, 103 const struct i2c_device_id *id) 104 { 105 struct max77693_dev *max77843; 106 unsigned int reg_data; 107 int ret; 108 109 max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL); 110 if (!max77843) 111 return -ENOMEM; 112 113 i2c_set_clientdata(i2c, max77843); 114 max77843->dev = &i2c->dev; 115 max77843->i2c = i2c; 116 max77843->irq = i2c->irq; 117 max77843->type = id->driver_data; 118 119 max77843->regmap = devm_regmap_init_i2c(i2c, 120 &max77843_regmap_config); 121 if (IS_ERR(max77843->regmap)) { 122 dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); 123 return PTR_ERR(max77843->regmap); 124 } 125 126 ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, 127 IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, 128 0, &max77843_irq_chip, &max77843->irq_data_topsys); 129 if (ret) { 130 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); 131 return ret; 132 } 133 134 ret = regmap_read(max77843->regmap, 135 MAX77843_SYS_REG_PMICID, ®_data); 136 if (ret < 0) { 137 dev_err(&i2c->dev, "Failed to read PMIC ID\n"); 138 goto err_pmic_id; 139 } 140 dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); 141 142 ret = max77843_chg_init(max77843); 143 if (ret) { 144 dev_err(&i2c->dev, "Failed to init Charger\n"); 145 goto err_pmic_id; 146 } 147 148 ret = regmap_update_bits(max77843->regmap, 149 MAX77843_SYS_REG_INTSRCMASK, 150 MAX77843_INTSRC_MASK_MASK, 151 (unsigned int)~MAX77843_INTSRC_MASK_MASK); 152 if (ret < 0) { 153 dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); 154 goto err_pmic_id; 155 } 156 157 ret = mfd_add_devices(max77843->dev, -1, max77843_devs, 158 ARRAY_SIZE(max77843_devs), NULL, 0, NULL); 159 if (ret < 0) { 160 dev_err(&i2c->dev, "Failed to add mfd device\n"); 161 goto err_pmic_id; 162 } 163 164 device_init_wakeup(max77843->dev, true); 165 166 return 0; 167 168 err_pmic_id: 169 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys); 170 171 return ret; 172 } 173 174 static int max77843_remove(struct i2c_client *i2c) 175 { 176 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 177 178 mfd_remove_devices(max77843->dev); 179 180 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys); 181 182 i2c_unregister_device(max77843->i2c_chg); 183 184 return 0; 185 } 186 187 static const struct of_device_id max77843_dt_match[] = { 188 { .compatible = "maxim,max77843", }, 189 { }, 190 }; 191 192 static const struct i2c_device_id max77843_id[] = { 193 { "max77843", TYPE_MAX77843, }, 194 { }, 195 }; 196 MODULE_DEVICE_TABLE(i2c, max77843_id); 197 198 static int __maybe_unused max77843_suspend(struct device *dev) 199 { 200 struct i2c_client *i2c = to_i2c_client(dev); 201 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 202 203 disable_irq(max77843->irq); 204 if (device_may_wakeup(dev)) 205 enable_irq_wake(max77843->irq); 206 207 return 0; 208 } 209 210 static int __maybe_unused max77843_resume(struct device *dev) 211 { 212 struct i2c_client *i2c = to_i2c_client(dev); 213 struct max77693_dev *max77843 = i2c_get_clientdata(i2c); 214 215 if (device_may_wakeup(dev)) 216 disable_irq_wake(max77843->irq); 217 enable_irq(max77843->irq); 218 219 return 0; 220 } 221 222 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); 223 224 static struct i2c_driver max77843_i2c_driver = { 225 .driver = { 226 .name = "max77843", 227 .pm = &max77843_pm, 228 .of_match_table = max77843_dt_match, 229 }, 230 .probe = max77843_probe, 231 .remove = max77843_remove, 232 .id_table = max77843_id, 233 }; 234 235 static int __init max77843_i2c_init(void) 236 { 237 return i2c_add_driver(&max77843_i2c_driver); 238 } 239 subsys_initcall(max77843_i2c_init); 240 241 static void __exit max77843_i2c_exit(void) 242 { 243 i2c_del_driver(&max77843_i2c_driver); 244 } 245 module_exit(max77843_i2c_exit); 246