1 /* 2 * max77693.c - mfd core driver for the MAX 77693 3 * 4 * Copyright (C) 2012 Samsung Electronics 5 * SangYoung Son <hello.son@smasung.com> 6 * 7 * This program is not provided / owned by Maxim Integrated Products. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 * 23 * This driver is based on max8997.c 24 */ 25 26 #include <linux/module.h> 27 #include <linux/slab.h> 28 #include <linux/i2c.h> 29 #include <linux/err.h> 30 #include <linux/interrupt.h> 31 #include <linux/of.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/mutex.h> 34 #include <linux/mfd/core.h> 35 #include <linux/mfd/max77693.h> 36 #include <linux/mfd/max77693-private.h> 37 #include <linux/regulator/machine.h> 38 #include <linux/regmap.h> 39 40 #define I2C_ADDR_PMIC (0xCC >> 1) /* Charger, Flash LED */ 41 #define I2C_ADDR_MUIC (0x4A >> 1) 42 #define I2C_ADDR_HAPTIC (0x90 >> 1) 43 44 static struct mfd_cell max77693_devs[] = { 45 { .name = "max77693-pmic", }, 46 { .name = "max77693-charger", }, 47 { .name = "max77693-flash", }, 48 { .name = "max77693-muic", }, 49 { .name = "max77693-haptic", }, 50 }; 51 52 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest) 53 { 54 unsigned int val; 55 int ret; 56 57 ret = regmap_read(map, reg, &val); 58 *dest = val; 59 60 return ret; 61 } 62 EXPORT_SYMBOL_GPL(max77693_read_reg); 63 64 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf) 65 { 66 int ret; 67 68 ret = regmap_bulk_read(map, reg, buf, count); 69 70 return ret; 71 } 72 EXPORT_SYMBOL_GPL(max77693_bulk_read); 73 74 int max77693_write_reg(struct regmap *map, u8 reg, u8 value) 75 { 76 int ret; 77 78 ret = regmap_write(map, reg, value); 79 80 return ret; 81 } 82 EXPORT_SYMBOL_GPL(max77693_write_reg); 83 84 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf) 85 { 86 int ret; 87 88 ret = regmap_bulk_write(map, reg, buf, count); 89 90 return ret; 91 } 92 EXPORT_SYMBOL_GPL(max77693_bulk_write); 93 94 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask) 95 { 96 int ret; 97 98 ret = regmap_update_bits(map, reg, mask, val); 99 100 return ret; 101 } 102 EXPORT_SYMBOL_GPL(max77693_update_reg); 103 104 static const struct regmap_config max77693_regmap_config = { 105 .reg_bits = 8, 106 .val_bits = 8, 107 .max_register = MAX77693_PMIC_REG_END, 108 }; 109 110 static int max77693_i2c_probe(struct i2c_client *i2c, 111 const struct i2c_device_id *id) 112 { 113 struct max77693_dev *max77693; 114 u8 reg_data; 115 int ret = 0; 116 117 max77693 = devm_kzalloc(&i2c->dev, 118 sizeof(struct max77693_dev), GFP_KERNEL); 119 if (max77693 == NULL) 120 return -ENOMEM; 121 122 i2c_set_clientdata(i2c, max77693); 123 max77693->dev = &i2c->dev; 124 max77693->i2c = i2c; 125 max77693->irq = i2c->irq; 126 max77693->type = id->driver_data; 127 128 max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config); 129 if (IS_ERR(max77693->regmap)) { 130 ret = PTR_ERR(max77693->regmap); 131 dev_err(max77693->dev, "failed to allocate register map: %d\n", 132 ret); 133 return ret; 134 } 135 136 ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2, 137 ®_data); 138 if (ret < 0) { 139 dev_err(max77693->dev, "device not found on this channel\n"); 140 return ret; 141 } else 142 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data); 143 144 max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC); 145 i2c_set_clientdata(max77693->muic, max77693); 146 147 max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC); 148 i2c_set_clientdata(max77693->haptic, max77693); 149 150 /* 151 * Initialize register map for MUIC device because use regmap-muic 152 * instance of MUIC device when irq of max77693 is initialized 153 * before call max77693-muic probe() function. 154 */ 155 max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic, 156 &max77693_regmap_config); 157 if (IS_ERR(max77693->regmap_muic)) { 158 ret = PTR_ERR(max77693->regmap_muic); 159 dev_err(max77693->dev, 160 "failed to allocate register map: %d\n", ret); 161 goto err_regmap_muic; 162 } 163 164 ret = max77693_irq_init(max77693); 165 if (ret < 0) 166 goto err_irq; 167 168 pm_runtime_set_active(max77693->dev); 169 170 ret = mfd_add_devices(max77693->dev, -1, max77693_devs, 171 ARRAY_SIZE(max77693_devs), NULL, 0, NULL); 172 if (ret < 0) 173 goto err_mfd; 174 175 return ret; 176 177 err_mfd: 178 max77693_irq_exit(max77693); 179 err_irq: 180 err_regmap_muic: 181 i2c_unregister_device(max77693->muic); 182 i2c_unregister_device(max77693->haptic); 183 return ret; 184 } 185 186 static int max77693_i2c_remove(struct i2c_client *i2c) 187 { 188 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 189 190 mfd_remove_devices(max77693->dev); 191 max77693_irq_exit(max77693); 192 i2c_unregister_device(max77693->muic); 193 i2c_unregister_device(max77693->haptic); 194 195 return 0; 196 } 197 198 static const struct i2c_device_id max77693_i2c_id[] = { 199 { "max77693", TYPE_MAX77693 }, 200 { } 201 }; 202 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id); 203 204 static int max77693_suspend(struct device *dev) 205 { 206 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 207 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 208 209 if (device_may_wakeup(dev)) 210 irq_set_irq_wake(max77693->irq, 1); 211 return 0; 212 } 213 214 static int max77693_resume(struct device *dev) 215 { 216 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 217 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 218 219 if (device_may_wakeup(dev)) 220 irq_set_irq_wake(max77693->irq, 0); 221 return max77693_irq_resume(max77693); 222 } 223 224 static const struct dev_pm_ops max77693_pm = { 225 .suspend = max77693_suspend, 226 .resume = max77693_resume, 227 }; 228 229 #ifdef CONFIG_OF 230 static struct of_device_id max77693_dt_match[] = { 231 { .compatible = "maxim,max77693" }, 232 {}, 233 }; 234 #endif 235 236 static struct i2c_driver max77693_i2c_driver = { 237 .driver = { 238 .name = "max77693", 239 .owner = THIS_MODULE, 240 .pm = &max77693_pm, 241 .of_match_table = of_match_ptr(max77693_dt_match), 242 }, 243 .probe = max77693_i2c_probe, 244 .remove = max77693_i2c_remove, 245 .id_table = max77693_i2c_id, 246 }; 247 248 static int __init max77693_i2c_init(void) 249 { 250 return i2c_add_driver(&max77693_i2c_driver); 251 } 252 /* init early so consumer devices can complete system boot */ 253 subsys_initcall(max77693_i2c_init); 254 255 static void __exit max77693_i2c_exit(void) 256 { 257 i2c_del_driver(&max77693_i2c_driver); 258 } 259 module_exit(max77693_i2c_exit); 260 261 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver"); 262 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>"); 263 MODULE_LICENSE("GPL"); 264