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