142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
/*
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* tps65912-spi.c -- SPI access for TI TPS65912x PMIC
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*
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* Copyright 2011 Texas Instruments Inc.
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*
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* Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This driver is based on wm8350 implementation.
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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/gpio.h>
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#include <linux/spi/spi.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65912.h>
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static int tps65912_spi_write(struct tps65912 *tps65912, u8 addr,
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int bytes, void *src)
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{
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struct spi_device *spi = tps65912->control_data;
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u8 *data = (u8 *) src;
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int ret;
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/* bit 23 is the read/write bit */
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unsigned long spi_data = 1 << 23 | addr << 15 | *data;
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struct spi_transfer xfer;
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struct spi_message msg;
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u32 tx_buf, rx_buf;
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tx_buf = spi_data;
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rx_buf = 0;
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xfer.tx_buf = &tx_buf;
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xfer.rx_buf = NULL;
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xfer.len = sizeof(unsigned long);
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xfer.bits_per_word = 24;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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ret = spi_sync(spi, &msg);
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return ret;
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}
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static int tps65912_spi_read(struct tps65912 *tps65912, u8 addr,
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int bytes, void *dest)
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{
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struct spi_device *spi = tps65912->control_data;
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/* bit 23 is the read/write bit */
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unsigned long spi_data = 0 << 23 | addr << 15;
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struct spi_transfer xfer;
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struct spi_message msg;
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int ret;
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u8 *data = (u8 *) dest;
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u32 tx_buf, rx_buf;
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tx_buf = spi_data;
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rx_buf = 0;
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xfer.tx_buf = &tx_buf;
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xfer.rx_buf = &rx_buf;
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xfer.len = sizeof(unsigned long);
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xfer.bits_per_word = 24;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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if (spi == NULL)
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return 0;
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ret = spi_sync(spi, &msg);
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if (ret == 0)
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*data = (u8) (rx_buf & 0xFF);
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return ret;
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}
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static int tps65912_spi_probe(struct spi_device *spi)
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{
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struct tps65912 *tps65912;
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tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
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if (tps65912 == NULL)
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return -ENOMEM;
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tps65912->dev = &spi->dev;
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tps65912->control_data = spi;
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tps65912->read = tps65912_spi_read;
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tps65912->write = tps65912_spi_write;
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spi_set_drvdata(spi, tps65912);
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return tps65912_device_init(tps65912);
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}
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static int tps65912_spi_remove(struct spi_device *spi)
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{
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struct tps65912 *tps65912 = spi_get_drvdata(spi);
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tps65912_device_exit(tps65912);
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return 0;
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}
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static struct spi_driver tps65912_spi_driver = {
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.driver = {
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.name = "tps65912",
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.owner = THIS_MODULE,
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},
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.probe = tps65912_spi_probe,
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.remove = tps65912_spi_remove,
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};
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static int __init tps65912_spi_init(void)
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{
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int ret;
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ret = spi_register_driver(&tps65912_spi_driver);
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if (ret != 0)
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pr_err("Failed to register TPS65912 SPI driver: %d\n", ret);
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return 0;
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(tps65912_spi_init);
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static void __exit tps65912_spi_exit(void)
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{
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spi_unregister_driver(&tps65912_spi_driver);
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}
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module_exit(tps65912_spi_exit);
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MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
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MODULE_DESCRIPTION("SPI support for TPS65912 chip family mfd");
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MODULE_LICENSE("GPL");
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