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/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 max77843 *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 PTR_ERR(max77843->i2c_chg); 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 max77843 *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; 116 117 max77843->regmap = devm_regmap_init_i2c(i2c, 118 &max77843_regmap_config); 119 if (IS_ERR(max77843->regmap)) { 120 dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); 121 return PTR_ERR(max77843->regmap); 122 } 123 124 ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, 125 IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, 126 0, &max77843_irq_chip, &max77843->irq_data); 127 if (ret) { 128 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); 129 return ret; 130 } 131 132 ret = regmap_read(max77843->regmap, 133 MAX77843_SYS_REG_PMICID, ®_data); 134 if (ret < 0) { 135 dev_err(&i2c->dev, "Failed to read PMIC ID\n"); 136 goto err_pmic_id; 137 } 138 dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); 139 140 ret = max77843_chg_init(max77843); 141 if (ret) { 142 dev_err(&i2c->dev, "Failed to init Charger\n"); 143 goto err_pmic_id; 144 } 145 146 ret = regmap_update_bits(max77843->regmap, 147 MAX77843_SYS_REG_INTSRCMASK, 148 MAX77843_INTSRC_MASK_MASK, 149 (unsigned int)~MAX77843_INTSRC_MASK_MASK); 150 if (ret < 0) { 151 dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); 152 goto err_pmic_id; 153 } 154 155 ret = mfd_add_devices(max77843->dev, -1, max77843_devs, 156 ARRAY_SIZE(max77843_devs), NULL, 0, NULL); 157 if (ret < 0) { 158 dev_err(&i2c->dev, "Failed to add mfd device\n"); 159 goto err_pmic_id; 160 } 161 162 device_init_wakeup(max77843->dev, true); 163 164 return 0; 165 166 err_pmic_id: 167 regmap_del_irq_chip(max77843->irq, max77843->irq_data); 168 169 return ret; 170 } 171 172 static int max77843_remove(struct i2c_client *i2c) 173 { 174 struct max77843 *max77843 = i2c_get_clientdata(i2c); 175 176 mfd_remove_devices(max77843->dev); 177 178 regmap_del_irq_chip(max77843->irq, max77843->irq_data); 179 180 i2c_unregister_device(max77843->i2c_chg); 181 182 return 0; 183 } 184 185 static const struct of_device_id max77843_dt_match[] = { 186 { .compatible = "maxim,max77843", }, 187 { }, 188 }; 189 190 static const struct i2c_device_id max77843_id[] = { 191 { "max77843", }, 192 { }, 193 }; 194 MODULE_DEVICE_TABLE(i2c, max77843_id); 195 196 static int __maybe_unused max77843_suspend(struct device *dev) 197 { 198 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 199 struct max77843 *max77843 = i2c_get_clientdata(i2c); 200 201 disable_irq(max77843->irq); 202 if (device_may_wakeup(dev)) 203 enable_irq_wake(max77843->irq); 204 205 return 0; 206 } 207 208 static int __maybe_unused max77843_resume(struct device *dev) 209 { 210 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 211 struct max77843 *max77843 = i2c_get_clientdata(i2c); 212 213 if (device_may_wakeup(dev)) 214 disable_irq_wake(max77843->irq); 215 enable_irq(max77843->irq); 216 217 return 0; 218 } 219 220 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); 221 222 static struct i2c_driver max77843_i2c_driver = { 223 .driver = { 224 .name = "max77843", 225 .pm = &max77843_pm, 226 .of_match_table = max77843_dt_match, 227 }, 228 .probe = max77843_probe, 229 .remove = max77843_remove, 230 .id_table = max77843_id, 231 }; 232 233 static int __init max77843_i2c_init(void) 234 { 235 return i2c_add_driver(&max77843_i2c_driver); 236 } 237 subsys_initcall(max77843_i2c_init); 238 239 static void __exit max77843_i2c_exit(void) 240 { 241 i2c_del_driver(&max77843_i2c_driver); 242 } 243 module_exit(max77843_i2c_exit); 244