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