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 if (!pdata) { 118 dev_err(&i2c->dev, "No platform data found.\n"); 119 return -EINVAL; 120 } 121 122 max77693 = devm_kzalloc(&i2c->dev, 123 sizeof(struct max77693_dev), GFP_KERNEL); 124 if (max77693 == NULL) 125 return -ENOMEM; 126 127 i2c_set_clientdata(i2c, max77693); 128 max77693->dev = &i2c->dev; 129 max77693->i2c = i2c; 130 max77693->irq = i2c->irq; 131 max77693->type = id->driver_data; 132 133 max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config); 134 if (IS_ERR(max77693->regmap)) { 135 ret = PTR_ERR(max77693->regmap); 136 dev_err(max77693->dev, "failed to allocate register map: %d\n", 137 ret); 138 return ret; 139 } 140 141 max77693->wakeup = pdata->wakeup; 142 143 ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2, 144 ®_data); 145 if (ret < 0) { 146 dev_err(max77693->dev, "device not found on this channel\n"); 147 return ret; 148 } else 149 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data); 150 151 max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC); 152 i2c_set_clientdata(max77693->muic, max77693); 153 154 max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC); 155 i2c_set_clientdata(max77693->haptic, max77693); 156 157 /* 158 * Initialize register map for MUIC device because use regmap-muic 159 * instance of MUIC device when irq of max77693 is initialized 160 * before call max77693-muic probe() function. 161 */ 162 max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic, 163 &max77693_regmap_config); 164 if (IS_ERR(max77693->regmap_muic)) { 165 ret = PTR_ERR(max77693->regmap_muic); 166 dev_err(max77693->dev, 167 "failed to allocate register map: %d\n", ret); 168 goto err_regmap_muic; 169 } 170 171 ret = max77693_irq_init(max77693); 172 if (ret < 0) 173 goto err_irq; 174 175 pm_runtime_set_active(max77693->dev); 176 177 ret = mfd_add_devices(max77693->dev, -1, max77693_devs, 178 ARRAY_SIZE(max77693_devs), NULL, 0, NULL); 179 if (ret < 0) 180 goto err_mfd; 181 182 device_init_wakeup(max77693->dev, pdata->wakeup); 183 184 return ret; 185 186 err_mfd: 187 max77693_irq_exit(max77693); 188 err_irq: 189 err_regmap_muic: 190 i2c_unregister_device(max77693->muic); 191 i2c_unregister_device(max77693->haptic); 192 return ret; 193 } 194 195 static int max77693_i2c_remove(struct i2c_client *i2c) 196 { 197 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 198 199 mfd_remove_devices(max77693->dev); 200 max77693_irq_exit(max77693); 201 i2c_unregister_device(max77693->muic); 202 i2c_unregister_device(max77693->haptic); 203 204 return 0; 205 } 206 207 static const struct i2c_device_id max77693_i2c_id[] = { 208 { "max77693", TYPE_MAX77693 }, 209 { } 210 }; 211 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id); 212 213 static int max77693_suspend(struct device *dev) 214 { 215 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 216 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 217 218 if (device_may_wakeup(dev)) 219 irq_set_irq_wake(max77693->irq, 1); 220 return 0; 221 } 222 223 static int max77693_resume(struct device *dev) 224 { 225 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 226 struct max77693_dev *max77693 = i2c_get_clientdata(i2c); 227 228 if (device_may_wakeup(dev)) 229 irq_set_irq_wake(max77693->irq, 0); 230 return max77693_irq_resume(max77693); 231 } 232 233 static const struct dev_pm_ops max77693_pm = { 234 .suspend = max77693_suspend, 235 .resume = max77693_resume, 236 }; 237 238 static struct i2c_driver max77693_i2c_driver = { 239 .driver = { 240 .name = "max77693", 241 .owner = THIS_MODULE, 242 .pm = &max77693_pm, 243 }, 244 .probe = max77693_i2c_probe, 245 .remove = max77693_i2c_remove, 246 .id_table = max77693_i2c_id, 247 }; 248 249 static int __init max77693_i2c_init(void) 250 { 251 return i2c_add_driver(&max77693_i2c_driver); 252 } 253 /* init early so consumer devices can complete system boot */ 254 subsys_initcall(max77693_i2c_init); 255 256 static void __exit max77693_i2c_exit(void) 257 { 258 i2c_del_driver(&max77693_i2c_driver); 259 } 260 module_exit(max77693_i2c_exit); 261 262 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver"); 263 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>"); 264 MODULE_LICENSE("GPL"); 265