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144 lines
3.1 KiB
144 lines
3.1 KiB
/* |
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* tps6507x.c -- TPS6507x chip family multi-function driver |
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* |
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* Copyright (c) 2010 RidgeRun ([email protected]) |
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* |
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* Author: Todd Fischer |
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* [email protected] |
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* |
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* Credits: |
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* |
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* Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC. |
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* |
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* For licencing details see kernel-base/COPYING |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps6507x.h> |
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static const struct mfd_cell tps6507x_devs[] = { |
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{ |
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.name = "tps6507x-pmic", |
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}, |
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{ |
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.name = "tps6507x-ts", |
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}, |
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}; |
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static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg, |
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int bytes, void *dest) |
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{ |
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struct i2c_client *i2c = tps6507x->i2c_client; |
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struct i2c_msg xfer[2]; |
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int ret; |
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/* Write register */ |
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xfer[0].addr = i2c->addr; |
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xfer[0].flags = 0; |
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xfer[0].len = 1; |
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xfer[0].buf = ® |
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/* Read data */ |
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xfer[1].addr = i2c->addr; |
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xfer[1].flags = I2C_M_RD; |
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xfer[1].len = bytes; |
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xfer[1].buf = dest; |
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ret = i2c_transfer(i2c->adapter, xfer, 2); |
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if (ret == 2) |
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ret = 0; |
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else if (ret >= 0) |
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ret = -EIO; |
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return ret; |
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} |
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static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg, |
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int bytes, void *src) |
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{ |
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struct i2c_client *i2c = tps6507x->i2c_client; |
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/* we add 1 byte for device register */ |
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u8 msg[TPS6507X_MAX_REGISTER + 1]; |
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int ret; |
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if (bytes > TPS6507X_MAX_REGISTER) |
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return -EINVAL; |
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msg[0] = reg; |
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memcpy(&msg[1], src, bytes); |
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ret = i2c_master_send(i2c, msg, bytes + 1); |
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if (ret < 0) |
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return ret; |
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if (ret != bytes + 1) |
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return -EIO; |
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return 0; |
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} |
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static int tps6507x_i2c_probe(struct i2c_client *i2c, |
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const struct i2c_device_id *id) |
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{ |
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struct tps6507x_dev *tps6507x; |
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tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev), |
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GFP_KERNEL); |
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if (tps6507x == NULL) |
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return -ENOMEM; |
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i2c_set_clientdata(i2c, tps6507x); |
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tps6507x->dev = &i2c->dev; |
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tps6507x->i2c_client = i2c; |
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tps6507x->read_dev = tps6507x_i2c_read_device; |
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tps6507x->write_dev = tps6507x_i2c_write_device; |
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return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs, |
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ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL); |
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} |
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static const struct i2c_device_id tps6507x_i2c_id[] = { |
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{ "tps6507x", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id); |
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#ifdef CONFIG_OF |
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static const struct of_device_id tps6507x_of_match[] = { |
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{.compatible = "ti,tps6507x", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, tps6507x_of_match); |
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#endif |
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static struct i2c_driver tps6507x_i2c_driver = { |
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.driver = { |
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.name = "tps6507x", |
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.of_match_table = of_match_ptr(tps6507x_of_match), |
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}, |
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.probe = tps6507x_i2c_probe, |
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.id_table = tps6507x_i2c_id, |
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}; |
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static int __init tps6507x_i2c_init(void) |
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{ |
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return i2c_add_driver(&tps6507x_i2c_driver); |
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} |
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/* init early so consumer devices can complete system boot */ |
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subsys_initcall(tps6507x_i2c_init); |
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static void __exit tps6507x_i2c_exit(void) |
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{ |
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i2c_del_driver(&tps6507x_i2c_driver); |
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} |
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module_exit(tps6507x_i2c_exit); |
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MODULE_DESCRIPTION("TPS6507x chip family multi-function driver"); |
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MODULE_LICENSE("GPL");
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