155 lines
3.5 KiB
C
155 lines
3.5 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/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 <linux/pm.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/of_device.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 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
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return lis3->write(lis3, CTRL_REG1, reg);
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}
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static union axis_conversion lis3lv02d_axis_normal =
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{ .as_array = { 1, 2, 3 } };
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#ifdef CONFIG_OF
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static struct of_device_id lis302dl_spi_dt_ids[] = {
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{ .compatible = "st,lis302dl-spi" },
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{}
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};
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MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
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#endif
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static int 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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#ifdef CONFIG_OF
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if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
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lis3_dev.of_node = spi->dev.of_node;
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ret = lis3lv02d_init_dt(&lis3_dev);
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if (ret)
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return ret;
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}
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#endif
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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 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(lis3);
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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_SLEEP
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static int lis3lv02d_spi_suspend(struct device *dev)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct lis3lv02d *lis3 = spi_get_drvdata(spi);
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if (!lis3->pdata || !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 device *dev)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct lis3lv02d *lis3 = spi_get_drvdata(spi);
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if (!lis3->pdata || !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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#endif
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static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
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lis3lv02d_spi_resume);
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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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.pm = &lis3lv02d_spi_pm,
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.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
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},
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.probe = lis302dl_spi_probe,
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.remove = lis302dl_spi_remove,
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};
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module_spi_driver(lis302dl_spi_driver);
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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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