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/of.h> 23 #include <linux/of_device.h> 24 #include <linux/mfd/core.h> 25 #include <linux/mfd/tps6507x.h> 26 27 static struct mfd_cell tps6507x_devs[] = { 28 { 29 .name = "tps6507x-pmic", 30 }, 31 { 32 .name = "tps6507x-ts", 33 }, 34 }; 35 36 37 static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg, 38 int bytes, void *dest) 39 { 40 struct i2c_client *i2c = tps6507x->i2c_client; 41 struct i2c_msg xfer[2]; 42 int ret; 43 44 /* Write register */ 45 xfer[0].addr = i2c->addr; 46 xfer[0].flags = 0; 47 xfer[0].len = 1; 48 xfer[0].buf = ® 49 50 /* Read data */ 51 xfer[1].addr = i2c->addr; 52 xfer[1].flags = I2C_M_RD; 53 xfer[1].len = bytes; 54 xfer[1].buf = dest; 55 56 ret = i2c_transfer(i2c->adapter, xfer, 2); 57 if (ret == 2) 58 ret = 0; 59 else if (ret >= 0) 60 ret = -EIO; 61 62 return ret; 63 } 64 65 static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg, 66 int bytes, void *src) 67 { 68 struct i2c_client *i2c = tps6507x->i2c_client; 69 /* we add 1 byte for device register */ 70 u8 msg[TPS6507X_MAX_REGISTER + 1]; 71 int ret; 72 73 if (bytes > TPS6507X_MAX_REGISTER) 74 return -EINVAL; 75 76 msg[0] = reg; 77 memcpy(&msg[1], src, bytes); 78 79 ret = i2c_master_send(i2c, msg, bytes + 1); 80 if (ret < 0) 81 return ret; 82 if (ret != bytes + 1) 83 return -EIO; 84 return 0; 85 } 86 87 static int tps6507x_i2c_probe(struct i2c_client *i2c, 88 const struct i2c_device_id *id) 89 { 90 struct tps6507x_dev *tps6507x; 91 92 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev), 93 GFP_KERNEL); 94 if (tps6507x == NULL) 95 return -ENOMEM; 96 97 i2c_set_clientdata(i2c, tps6507x); 98 tps6507x->dev = &i2c->dev; 99 tps6507x->i2c_client = i2c; 100 tps6507x->read_dev = tps6507x_i2c_read_device; 101 tps6507x->write_dev = tps6507x_i2c_write_device; 102 103 return mfd_add_devices(tps6507x->dev, -1, tps6507x_devs, 104 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL); 105 } 106 107 static int tps6507x_i2c_remove(struct i2c_client *i2c) 108 { 109 struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c); 110 111 mfd_remove_devices(tps6507x->dev); 112 return 0; 113 } 114 115 static const struct i2c_device_id tps6507x_i2c_id[] = { 116 { "tps6507x", 0 }, 117 { } 118 }; 119 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id); 120 121 #ifdef CONFIG_OF 122 static struct of_device_id tps6507x_of_match[] = { 123 {.compatible = "ti,tps6507x", }, 124 {}, 125 }; 126 MODULE_DEVICE_TABLE(of, tps6507x_of_match); 127 #endif 128 129 static struct i2c_driver tps6507x_i2c_driver = { 130 .driver = { 131 .name = "tps6507x", 132 .owner = THIS_MODULE, 133 .of_match_table = of_match_ptr(tps6507x_of_match), 134 }, 135 .probe = tps6507x_i2c_probe, 136 .remove = tps6507x_i2c_remove, 137 .id_table = tps6507x_i2c_id, 138 }; 139 140 static int __init tps6507x_i2c_init(void) 141 { 142 return i2c_add_driver(&tps6507x_i2c_driver); 143 } 144 /* init early so consumer devices can complete system boot */ 145 subsys_initcall(tps6507x_i2c_init); 146 147 static void __exit tps6507x_i2c_exit(void) 148 { 149 i2c_del_driver(&tps6507x_i2c_driver); 150 } 151 module_exit(tps6507x_i2c_exit); 152 153 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver"); 154 MODULE_LICENSE("GPL"); 155