git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 31dd6a26 TF |
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 | }, | |
| 75259966 TF |
29 | { |
| 30 | .name = "tps6507x-ts", | |
| 31 | }, | |
| 31dd6a26 TF |
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 | ||
| a8d6aa08 | 71 | if (bytes > TPS6507X_MAX_REGISTER) |
| 31dd6a26 TF |
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); | |
| 04a06423 | 92 | if (tps6507x == NULL) |
| 31dd6a26 | 93 | return -ENOMEM; |
| 31dd6a26 TF |
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); | |
| 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"); |