LXR linux/drivers/misc/lis3lv02d/lis3lv02d

   1/*
   2 * lis3lv02d_spi - SPI glue layer for lis3lv02d
   3 *
   4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License version 2 as
   8 *  publishhed by the Free Software Foundation.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/kernel.h>
  13#include <linux/init.h>
  14#include <linux/err.h>
  15#include <linux/input.h>
  16#include <linux/interrupt.h>
  17#include <linux/workqueue.h>
  18#include <linux/spi/spi.h>
  19#include <linux/pm.h>
  20#include <linux/of.h>
  21#include <linux/of_platform.h>
  22#include <linux/of_device.h>
  23
  24#include "lis3lv02d.h"
  25
  26#define DRV_NAME        "lis3lv02d_spi"
  27#define LIS3_SPI_READ   0x80
  28
  29static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
  30{
  31        struct spi_device *spi = lis3->bus_priv;
  32        int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
  33        if (ret < 0)
  34                return -EINVAL;
  35
  36        *v = (u8) ret;
  37        return 0;
  38}
  39
  40static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
  41{
  42        u8 tmp[2] = { reg, val };
  43        struct spi_device *spi = lis3->bus_priv;
  44        return spi_write(spi, tmp, sizeof(tmp));
  45}
  46
  47static int lis3_spi_init(struct lis3lv02d *lis3)
  48{
  49        u8 reg;
  50        int ret;
  51
  52        /* power up the device */
  53        ret = lis3->read(lis3, CTRL_REG1, &reg);
  54        if (ret < 0)
  55                return ret;
  56
  57        reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
  58        return lis3->write(lis3, CTRL_REG1, reg);
  59}
  60
  61static union axis_conversion lis3lv02d_axis_normal =
  62        { .as_array = { 1, 2, 3 } };
  63
  64#ifdef CONFIG_OF
  65static struct of_device_id lis302dl_spi_dt_ids[] = {
  66        { .compatible = "st,lis302dl-spi" },
  67        {}
  68};
  69MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
  70#endif
  71
  72static int lis302dl_spi_probe(struct spi_device *spi)
  73{
  74        int ret;
  75
  76        spi->bits_per_word = 8;
  77        spi->mode = SPI_MODE_0;
  78        ret = spi_setup(spi);
  79        if (ret < 0)
  80                return ret;
  81
  82        lis3_dev.bus_priv       = spi;
  83        lis3_dev.init           = lis3_spi_init;
  84        lis3_dev.read           = lis3_spi_read;
  85        lis3_dev.write          = lis3_spi_write;
  86        lis3_dev.irq            = spi->irq;
  87        lis3_dev.ac             = lis3lv02d_axis_normal;
  88        lis3_dev.pdata          = spi->dev.platform_data;
  89
  90#ifdef CONFIG_OF
  91        if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
  92                lis3_dev.of_node = spi->dev.of_node;
  93                ret = lis3lv02d_init_dt(&lis3_dev);
  94                if (ret)
  95                        return ret;
  96        }
  97#endif
  98        spi_set_drvdata(spi, &lis3_dev);
  99
 100        return lis3lv02d_init_device(&lis3_dev);
 101}
 102
 103static int lis302dl_spi_remove(struct spi_device *spi)
 104{
 105        struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 106        lis3lv02d_joystick_disable(lis3);
 107        lis3lv02d_poweroff(lis3);
 108
 109        return lis3lv02d_remove_fs(&lis3_dev);
 110}
 111
 112#ifdef CONFIG_PM_SLEEP
 113static int lis3lv02d_spi_suspend(struct device *dev)
 114{
 115        struct spi_device *spi = to_spi_device(dev);
 116        struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 117
 118        if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 119                lis3lv02d_poweroff(&lis3_dev);
 120
 121        return 0;
 122}
 123
 124static int lis3lv02d_spi_resume(struct device *dev)
 125{
 126        struct spi_device *spi = to_spi_device(dev);
 127        struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 128
 129        if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 130                lis3lv02d_poweron(lis3);
 131
 132        return 0;
 133}
 134#endif
 135
 136static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
 137                         lis3lv02d_spi_resume);
 138
 139static struct spi_driver lis302dl_spi_driver = {
 140        .driver  = {
 141                .name   = DRV_NAME,
 142                .owner  = THIS_MODULE,
 143                .pm     = &lis3lv02d_spi_pm,
 144                .of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
 145        },
 146        .probe  = lis302dl_spi_probe,
 147        .remove = lis302dl_spi_remove,
 148};
 149
 150module_spi_driver(lis302dl_spi_driver);
 151
 152MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 153MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
 154MODULE_LICENSE("GPL");
 155MODULE_ALIAS("spi:" DRV_NAME);
 156