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/pm_runtime.h> 32 #include <linux/mutex.h> 33 #include <linux/mfd/core.h> 34 #include <linux/mfd/max77693.h> 35 #include <linux/mfd/max77693-private.h> 36 #include <linux/regulator/machine.h> 37 #include <linux/regmap.h> 38 39 #define I2C_ADDR_PMIC (0xCC >> 1) /* Charger, Flash LED */ 40 #define I2C_ADDR_MUIC (0x4A >> 1) 41 #define I2C_ADDR_HAPTIC (0x90 >> 1) 42 43 static struct mfd_cell max77693_devs[] = { 44 { .name = "max77693-pmic", }, 45 { .name = "max77693-charger", }, 46 { .name = "max77693-flash", }, 47 { .name = "max77693-muic", }, 48 { .name = "max77693-haptic", }, 49 }; 50 51 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest) 52 { 53 unsigned int val; 54 int ret; 55 56 ret = regmap_read(map, reg, &val); 57 *dest = val; 58 59 return ret; 60 } 61 EXPORT_SYMBOL_GPL(max77693_read_reg); 62 63 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf) 64 { 65 int ret; 66 67 ret = regmap_bulk_read(map, reg, buf, count); 68 69 return ret; 70 } 71 EXPORT_SYMBOL_GPL(max77693_bulk_read); 72 73 int max77693_write_reg(struct regmap *map, u8 reg, u8 value) 74 { 75 int ret; 76 77 ret = regmap_write(map, reg, value); 78 79 return ret; 80 } 81 EXPORT_SYMBOL_GPL(max77693_write_reg); 82 83 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf) 84 { 85 int ret; 86 87 ret = regmap_bulk_write(map, reg, buf, count); 88 89 return ret; 90 } 91 EXPORT_SYMBOL_GPL(max77693_bulk_write); 92 93 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask) 94 { 95 int ret; 96 97 ret = regmap_update_bits(map, reg, mask, val); 98 99 return ret; 100 } 101 EXPORT_SYMBOL_GPL(max77693_update_reg); 102 103 static const struct regmap_config max77693_regmap_config = { 104 .reg_bits = 8, 105 .val_bits = 8, 106 .max_register = MAX77693_PMIC_REG_END, 107 }; 108 109 static int max77693_i2c_probe(struct i2c_client *i2c, 110 const struct i2c_device_id *id) 111 { 112 struct max77693_dev *max77693; 113 struct max77693_platform_data *pdata = i2c->dev.platform_data; 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 max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config); 123 if (IS_ERR(max77693->regmap)) { 124 ret = PTR_ERR(max77693->regmap); 125 dev_err(max77693->dev,"failed to allocate register map: %d\n", 126 ret); 127 goto err_regmap; 128 } 129 130 i2c_set_clientdata(i2c, max77693); 131 max77693->dev = &i2c->dev; 132 max77693->i2c = i2c; 133 max77693->irq = i2c->irq; 134 max77693->type = id->driver_data; 135 136 if (!pdata) 137 goto err_regmap; 138 139 max77693->wakeup = pdata->wakeup; 140 141 if (max77693_read_reg(max77693->regmap, 142 MAX77693_PMIC_REG_PMIC_ID2, ®_data) < 0) { 143 dev_err(max77693->dev, "device not found on this channel\n"); 144 ret = -ENODEV; 145 goto err_regmap; 146 } else 147 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data); 148 149 max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC); 150 i2c_set_clientdata(max77693->muic, max77693); 151 152 max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC); 153 i2c_set_clientdata(max77693->haptic, max77693); 154 155 /* 156 * Initialize register map for MUIC device because use regmap-muic 157 * instance of MUIC device when irq of max77693 is initialized 158 * before call max77693-muic probe() function. 159 */ 160 max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic, 161 &max77693_regmap_config); 162 if (IS_ERR(max77693->regmap_muic)) { 163 ret = PTR_ERR(max77693->regmap_muic); 164 dev_err(max77693->dev, 165 "failed to allocate register map: %d\n", ret); 166 goto err_regmap; 167 } 168 169 ret = max77693_irq_init(max77693); 170 if (ret < 0) 171 goto err_irq; 172 173 pm_runtime_set_active(max77693->dev); 174 175 ret = mfd_add_devices(max77693->dev, -1, max77693_devs, 176 ARRAY_SIZE(max77693_devs), NULL, 0, NULL); 177 if (ret < 0) 178 goto err_mfd; 179 180 device_init_wakeup(max77693->dev, pdata->wakeup); 181 182 return ret; 183 184 err_mfd: 185 max77693_irq_exit(max77693); 186 err_irq: 187 i2c_unregister_device(max77693->muic); 188 i2c_unregister_device(max77693->haptic); 189 err_regmap: 190 return ret; 191 } 192 193 static int max77693_i2c_remove(struct i2c_client *i2c) 194 { 195 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 196 197 mfd_remove_devices(max77693->dev); 198 max77693_irq_exit(max77693); 199 i2c_unregister_device(max77693->muic); 200 i2c_unregister_device(max77693->haptic); 201 202 return 0; 203 } 204 205 static const struct i2c_device_id max77693_i2c_id[] = { 206 { "max77693", TYPE_MAX77693 }, 207 { } 208 }; 209 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id); 210 211 static int max77693_suspend(struct device *dev) 212 { 213 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 214 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 215 216 if (device_may_wakeup(dev)) 217 irq_set_irq_wake(max77693->irq, 1); 218 return 0; 219 } 220 221 static int max77693_resume(struct device *dev) 222 { 223 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 224 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 225 226 if (device_may_wakeup(dev)) 227 irq_set_irq_wake(max77693->irq, 0); 228 return max77693_irq_resume(max77693); 229 } 230 231 static const struct dev_pm_ops max77693_pm = { 232 .suspend = max77693_suspend, 233 .resume = max77693_resume, 234 }; 235 236 static struct i2c_driver max77693_i2c_driver = { 237 .driver = { 238 .name = "max77693", 239 .owner = THIS_MODULE, 240 .pm = &max77693_pm, 241 }, 242 .probe = max77693_i2c_probe, 243 .remove = max77693_i2c_remove, 244 .id_table = max77693_i2c_id, 245 }; 246 247 static int __init max77693_i2c_init(void) 248 { 249 return i2c_add_driver(&max77693_i2c_driver); 250 } 251 /* init early so consumer devices can complete system boot */ 252 subsys_initcall(max77693_i2c_init); 253 254 static void __exit max77693_i2c_exit(void) 255 { 256 i2c_del_driver(&max77693_i2c_driver); 257 } 258 module_exit(max77693_i2c_exit); 259 260 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver"); 261 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>"); 262 MODULE_LICENSE("GPL"); 263