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