144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/*
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* lis3lv02d_spi - SPI glue layer for lis3lv02d
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*
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* publishhed by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/spi/spi.h>
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#include "lis3lv02d.h"
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#define DRV_NAME "lis3lv02d_spi"
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#define LIS3_SPI_READ 0x80
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static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
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{
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struct spi_device *spi = lis3->bus_priv;
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int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
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if (ret < 0)
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return -EINVAL;
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*v = (u8) ret;
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return 0;
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}
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static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
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{
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u8 tmp[2] = { reg, val };
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struct spi_device *spi = lis3->bus_priv;
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return spi_write(spi, tmp, sizeof(tmp));
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}
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static int lis3_spi_init(struct lis3lv02d *lis3)
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{
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u8 reg;
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int ret;
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/* power up the device */
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ret = lis3->read(lis3, CTRL_REG1, ®);
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if (ret < 0)
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return ret;
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reg |= CTRL1_PD0;
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return lis3->write(lis3, CTRL_REG1, reg);
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}
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static struct axis_conversion lis3lv02d_axis_normal = { 1, 2, 3 };
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static int __devinit lis302dl_spi_probe(struct spi_device *spi)
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{
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int ret;
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spi->bits_per_word = 8;
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spi->mode = SPI_MODE_0;
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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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lis3_dev.bus_priv = spi;
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lis3_dev.init = lis3_spi_init;
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lis3_dev.read = lis3_spi_read;
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lis3_dev.write = lis3_spi_write;
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lis3_dev.irq = spi->irq;
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lis3_dev.ac = lis3lv02d_axis_normal;
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lis3_dev.pdata = spi->dev.platform_data;
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spi_set_drvdata(spi, &lis3_dev);
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return lis3lv02d_init_device(&lis3_dev);
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}
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static int __devexit lis302dl_spi_remove(struct spi_device *spi)
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{
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struct lis3lv02d *lis3 = spi_get_drvdata(spi);
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lis3lv02d_joystick_disable();
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lis3lv02d_poweroff(lis3);
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return lis3lv02d_remove_fs(&lis3_dev);
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}
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#ifdef CONFIG_PM
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static int lis3lv02d_spi_suspend(struct spi_device *spi, pm_message_t mesg)
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{
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struct lis3lv02d *lis3 = spi_get_drvdata(spi);
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if (!lis3->pdata->wakeup_flags)
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lis3lv02d_poweroff(&lis3_dev);
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return 0;
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}
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static int lis3lv02d_spi_resume(struct spi_device *spi)
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{
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struct lis3lv02d *lis3 = spi_get_drvdata(spi);
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if (!lis3->pdata->wakeup_flags)
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lis3lv02d_poweron(lis3);
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return 0;
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}
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#else
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#define lis3lv02d_spi_suspend NULL
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#define lis3lv02d_spi_resume NULL
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#endif
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static struct spi_driver lis302dl_spi_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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.probe = lis302dl_spi_probe,
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.remove = __devexit_p(lis302dl_spi_remove),
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.suspend = lis3lv02d_spi_suspend,
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.resume = lis3lv02d_spi_resume,
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};
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static int __init lis302dl_init(void)
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{
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return spi_register_driver(&lis302dl_spi_driver);
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}
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static void __exit lis302dl_exit(void)
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{
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spi_unregister_driver(&lis302dl_spi_driver);
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}
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module_init(lis302dl_init);
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module_exit(lis302dl_exit);
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
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MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("spi:" DRV_NAME);
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