diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/input/touchscreen/ad7879-spi.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/input/touchscreen/ad7879-spi.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/ANDROID_3.4.5/drivers/input/touchscreen/ad7879-spi.c b/ANDROID_3.4.5/drivers/input/touchscreen/ad7879-spi.c deleted file mode 100644 index db49abf0..00000000 --- a/ANDROID_3.4.5/drivers/input/touchscreen/ad7879-spi.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * AD7879/AD7889 touchscreen (SPI bus) - * - * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/input.h> /* BUS_SPI */ -#include <linux/pm.h> -#include <linux/spi/spi.h> -#include <linux/module.h> - -#include "ad7879.h" - -#define AD7879_DEVID 0x7A /* AD7879/AD7889 */ - -#define MAX_SPI_FREQ_HZ 5000000 -#define AD7879_CMD_MAGIC 0xE000 -#define AD7879_CMD_READ (1 << 10) -#define AD7879_CMD(reg) (AD7879_CMD_MAGIC | ((reg) & 0xF)) -#define AD7879_WRITECMD(reg) (AD7879_CMD(reg)) -#define AD7879_READCMD(reg) (AD7879_CMD(reg) | AD7879_CMD_READ) - -/* - * ad7879_read/write are only used for initial setup and for sysfs controls. - * The main traffic is done in ad7879_collect(). - */ - -static int ad7879_spi_xfer(struct spi_device *spi, - u16 cmd, u8 count, u16 *tx_buf, u16 *rx_buf) -{ - struct spi_message msg; - struct spi_transfer *xfers; - void *spi_data; - u16 *command; - u16 *_rx_buf = _rx_buf; /* shut gcc up */ - u8 idx; - int ret; - - xfers = spi_data = kzalloc(sizeof(*xfers) * (count + 2), GFP_KERNEL); - if (!spi_data) - return -ENOMEM; - - spi_message_init(&msg); - - command = spi_data; - command[0] = cmd; - if (count == 1) { - /* ad7879_spi_{read,write} gave us buf on stack */ - command[1] = *tx_buf; - tx_buf = &command[1]; - _rx_buf = rx_buf; - rx_buf = &command[2]; - } - - ++xfers; - xfers[0].tx_buf = command; - xfers[0].len = 2; - spi_message_add_tail(&xfers[0], &msg); - ++xfers; - - for (idx = 0; idx < count; ++idx) { - if (rx_buf) - xfers[idx].rx_buf = &rx_buf[idx]; - if (tx_buf) - xfers[idx].tx_buf = &tx_buf[idx]; - xfers[idx].len = 2; - spi_message_add_tail(&xfers[idx], &msg); - } - - ret = spi_sync(spi, &msg); - - if (count == 1) - _rx_buf[0] = command[2]; - - kfree(spi_data); - - return ret; -} - -static int ad7879_spi_multi_read(struct device *dev, - u8 first_reg, u8 count, u16 *buf) -{ - struct spi_device *spi = to_spi_device(dev); - - return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf); -} - -static int ad7879_spi_read(struct device *dev, u8 reg) -{ - struct spi_device *spi = to_spi_device(dev); - u16 ret, dummy; - - return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret; -} - -static int ad7879_spi_write(struct device *dev, u8 reg, u16 val) -{ - struct spi_device *spi = to_spi_device(dev); - u16 dummy; - - return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy); -} - -static const struct ad7879_bus_ops ad7879_spi_bus_ops = { - .bustype = BUS_SPI, - .read = ad7879_spi_read, - .multi_read = ad7879_spi_multi_read, - .write = ad7879_spi_write, -}; - -static int __devinit ad7879_spi_probe(struct spi_device *spi) -{ - struct ad7879 *ts; - int err; - - /* don't exceed max specified SPI CLK frequency */ - if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { - dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz); - return -EINVAL; - } - - spi->bits_per_word = 16; - err = spi_setup(spi); - if (err) { - dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); - return err; - } - - ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops); - if (IS_ERR(ts)) - return PTR_ERR(ts); - - spi_set_drvdata(spi, ts); - - return 0; -} - -static int __devexit ad7879_spi_remove(struct spi_device *spi) -{ - struct ad7879 *ts = spi_get_drvdata(spi); - - ad7879_remove(ts); - spi_set_drvdata(spi, NULL); - - return 0; -} - -static struct spi_driver ad7879_spi_driver = { - .driver = { - .name = "ad7879", - .owner = THIS_MODULE, - .pm = &ad7879_pm_ops, - }, - .probe = ad7879_spi_probe, - .remove = __devexit_p(ad7879_spi_remove), -}; - -module_spi_driver(ad7879_spi_driver); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("spi:ad7879"); |