1 /* 2 * tps6507x.c -- TPS6507x chip family multi-function driver 3 * 4 * Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com) 5 * 6 * Author: Todd Fischer 7 * todd.fischer@ridgerun.com 8 * 9 * Credits: 10 * 11 * Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC. 12 * 13 * For licencing details see kernel-base/COPYING 14 * 15 */ 16 17 #include <linux/module.h> 18 #include <linux/moduleparam.h> 19 #include <linux/init.h> 20 #include <linux/slab.h> 21 #include <linux/i2c.h> 22 #include <linux/mfd/core.h> 23 #include <linux/mfd/tps6507x.h> 24 25 static struct mfd_cell tps6507x_devs[] = { 26 { 27 .name = "tps6507x-pmic", 28 }, 29 { 30 .name = "tps6507x-ts", 31 }, 32 }; 33 34 35 static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg, 36 int bytes, void *dest) 37 { 38 struct i2c_client *i2c = tps6507x->i2c_client; 39 struct i2c_msg xfer[2]; 40 int ret; 41 42 /* Write register */ 43 xfer[0].addr = i2c->addr; 44 xfer[0].flags = 0; 45 xfer[0].len = 1; 46 xfer[0].buf = ® 47 48 /* Read data */ 49 xfer[1].addr = i2c->addr; 50 xfer[1].flags = I2C_M_RD; 51 xfer[1].len = bytes; 52 xfer[1].buf = dest; 53 54 ret = i2c_transfer(i2c->adapter, xfer, 2); 55 if (ret == 2) 56 ret = 0; 57 else if (ret >= 0) 58 ret = -EIO; 59 60 return ret; 61 } 62 63 static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg, 64 int bytes, void *src) 65 { 66 struct i2c_client *i2c = tps6507x->i2c_client; 67 /* we add 1 byte for device register */ 68 u8 msg[TPS6507X_MAX_REGISTER + 1]; 69 int ret; 70 71 if (bytes > TPS6507X_MAX_REGISTER) 72 return -EINVAL; 73 74 msg[0] = reg; 75 memcpy(&msg[1], src, bytes); 76 77 ret = i2c_master_send(i2c, msg, bytes + 1); 78 if (ret < 0) 79 return ret; 80 if (ret != bytes + 1) 81 return -EIO; 82 return 0; 83 } 84 85 static int tps6507x_i2c_probe(struct i2c_client *i2c, 86 const struct i2c_device_id *id) 87 { 88 struct tps6507x_dev *tps6507x; 89 int ret = 0; 90 91 tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL); 92 if (tps6507x == NULL) 93 return -ENOMEM; 94 95 i2c_set_clientdata(i2c, tps6507x); 96 tps6507x->dev = &i2c->dev; 97 tps6507x->i2c_client = i2c; 98 tps6507x->read_dev = tps6507x_i2c_read_device; 99 tps6507x->write_dev = tps6507x_i2c_write_device; 100 101 ret = mfd_add_devices(tps6507x->dev, -1, 102 tps6507x_devs, ARRAY_SIZE(tps6507x_devs), 103 NULL, 0, NULL); 104 105 if (ret < 0) 106 goto err; 107 108 return ret; 109 110 err: 111 mfd_remove_devices(tps6507x->dev); 112 kfree(tps6507x); 113 return ret; 114 } 115 116 static int tps6507x_i2c_remove(struct i2c_client *i2c) 117 { 118 struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c); 119 120 mfd_remove_devices(tps6507x->dev); 121 kfree(tps6507x); 122 123 return 0; 124 } 125 126 static const struct i2c_device_id tps6507x_i2c_id[] = { 127 { "tps6507x", 0 }, 128 { } 129 }; 130 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id); 131 132 133 static struct i2c_driver tps6507x_i2c_driver = { 134 .driver = { 135 .name = "tps6507x", 136 .owner = THIS_MODULE, 137 }, 138 .probe = tps6507x_i2c_probe, 139 .remove = tps6507x_i2c_remove, 140 .id_table = tps6507x_i2c_id, 141 }; 142 143 static int __init tps6507x_i2c_init(void) 144 { 145 return i2c_add_driver(&tps6507x_i2c_driver); 146 } 147 /* init early so consumer devices can complete system boot */ 148 subsys_initcall(tps6507x_i2c_init); 149 150 static void __exit tps6507x_i2c_exit(void) 151 { 152 i2c_del_driver(&tps6507x_i2c_driver); 153 } 154 module_exit(tps6507x_i2c_exit); 155 156 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver"); 157 MODULE_LICENSE("GPL"); 158