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bde435a9ca
This patch adds spi->mode support for the AMBA pl022 driver and allows spidev to correctly alter SPI modes. Unused fields used in the pl022 header file for the pl022_config_chip have been removed. The ab8500 client driver selects the data transfer size instead of the platform data. For platforms that use the amba pl022 driver, the unused fields in the controller data structure have been removed and the .mode field in the SPI board info structure is used instead. Signed-off-by: Kevin Wells <wellsk40@gmail.com> Tested-by: Linus Walleij <linus.walleij@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License v2
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* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/mfd/ab8500.h>
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/*
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* This funtion writes to any AB8500 registers using
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* SPI protocol & before it writes it packs the data
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* in the below 24 bit frame format
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*
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* *|------------------------------------|
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* *| 23|22...18|17.......10|9|8|7......0|
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* *| r/w bank adr data |
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* * ------------------------------------
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*
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* This function shouldn't be called from interrupt
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* context
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*/
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static int ab8500_spi_write(struct ab8500 *ab8500, u16 addr, u8 data)
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{
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struct spi_device *spi = container_of(ab8500->dev, struct spi_device,
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dev);
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unsigned long spi_data = addr << 10 | data;
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struct spi_transfer xfer;
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struct spi_message msg;
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ab8500->tx_buf[0] = spi_data;
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ab8500->rx_buf[0] = 0;
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xfer.tx_buf = ab8500->tx_buf;
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xfer.rx_buf = NULL;
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xfer.len = sizeof(unsigned long);
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(spi, &msg);
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}
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static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr)
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{
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struct spi_device *spi = container_of(ab8500->dev, struct spi_device,
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dev);
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unsigned long spi_data = 1 << 23 | addr << 10;
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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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ab8500->tx_buf[0] = spi_data;
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ab8500->rx_buf[0] = 0;
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xfer.tx_buf = ab8500->tx_buf;
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xfer.rx_buf = ab8500->rx_buf;
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xfer.len = sizeof(unsigned long);
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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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if (!ret)
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/*
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* Only the 8 lowermost bytes are
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* defined with value, the rest may
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* vary depending on chip/board noise.
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*/
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ret = ab8500->rx_buf[0] & 0xFFU;
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return ret;
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}
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static int __devinit ab8500_spi_probe(struct spi_device *spi)
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{
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struct ab8500 *ab8500;
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int ret;
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spi->bits_per_word = 24;
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ret = spi_setup(spi);
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if (ret < 0)
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return ret;
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ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
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if (!ab8500)
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return -ENOMEM;
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ab8500->dev = &spi->dev;
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ab8500->irq = spi->irq;
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ab8500->read = ab8500_spi_read;
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ab8500->write = ab8500_spi_write;
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spi_set_drvdata(spi, ab8500);
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ret = ab8500_init(ab8500);
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if (ret)
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kfree(ab8500);
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return ret;
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}
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static int __devexit ab8500_spi_remove(struct spi_device *spi)
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{
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struct ab8500 *ab8500 = spi_get_drvdata(spi);
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ab8500_exit(ab8500);
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kfree(ab8500);
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return 0;
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}
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static struct spi_driver ab8500_spi_driver = {
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.driver = {
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.name = "ab8500",
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.owner = THIS_MODULE,
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},
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.probe = ab8500_spi_probe,
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.remove = __devexit_p(ab8500_spi_remove)
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};
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static int __init ab8500_spi_init(void)
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{
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return spi_register_driver(&ab8500_spi_driver);
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}
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subsys_initcall(ab8500_spi_init);
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static void __exit ab8500_spi_exit(void)
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{
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spi_unregister_driver(&ab8500_spi_driver);
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}
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module_exit(ab8500_spi_exit);
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MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com");
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MODULE_DESCRIPTION("AB8500 SPI");
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MODULE_LICENSE("GPL v2");
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