drivers/misc/lis3lv02d/lis3lv02d_spi.c

   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
  21 #include "lis3lv02d.h"
  22
  23 #define DRV_NAME        "lis3lv02d_spi"
  24 #define LIS3_SPI_READ   0x80
  25
  26 static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
  27 {
  28         struct spi_device *spi = lis3->bus_priv;
  29         int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
  30         if (ret < 0)
  31                 return -EINVAL;
  32
  33         *v = (u8) ret;
  34         return 0;
  35 }
  36
  37 static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
  38 {
  39         u8 tmp[2] = { reg, val };
  40         struct spi_device *spi = lis3->bus_priv;
  41         return spi_write(spi, tmp, sizeof(tmp));
  42 }
  43
  44 static int lis3_spi_init(struct lis3lv02d *lis3)
  45 {
  46         u8 reg;
  47         int ret;
  48
  49         /* power up the device */
  50         ret = lis3->read(lis3, CTRL_REG1, &reg);
  51         if (ret < 0)
  52                 return ret;
  53
  54         reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
  55         return lis3->write(lis3, CTRL_REG1, reg);
  56 }
  57
  58 static union axis_conversion lis3lv02d_axis_normal =
  59         { .as_array = { 1, 2, 3 } };
  60
  61 static int __devinit lis302dl_spi_probe(struct spi_device *spi)
  62 {
  63         int ret;
  64
  65         spi->bits_per_word = 8;
  66         spi->mode = SPI_MODE_0;
  67         ret = spi_setup(spi);
  68         if (ret < 0)
  69                 return ret;
  70
  71         lis3_dev.bus_priv       = spi;
  72         lis3_dev.init           = lis3_spi_init;
  73         lis3_dev.read           = lis3_spi_read;
  74         lis3_dev.write          = lis3_spi_write;
  75         lis3_dev.irq            = spi->irq;
  76         lis3_dev.ac             = lis3lv02d_axis_normal;
  77         lis3_dev.pdata          = spi->dev.platform_data;
  78         spi_set_drvdata(spi, &lis3_dev);
  79
  80         return lis3lv02d_init_device(&lis3_dev);
  81 }
  82
  83 static int __devexit lis302dl_spi_remove(struct spi_device *spi)
  84 {
  85         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
  86         lis3lv02d_joystick_disable(lis3);
  87         lis3lv02d_poweroff(lis3);
  88
  89         return lis3lv02d_remove_fs(&lis3_dev);
  90 }
  91
  92 #ifdef CONFIG_PM_SLEEP
  93 static int lis3lv02d_spi_suspend(struct device *dev)
  94 {
  95         struct spi_device *spi = to_spi_device(dev);
  96         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
  97
  98         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
  99                 lis3lv02d_poweroff(&lis3_dev);
 100
 101         return 0;
 102 }
 103
 104 static int lis3lv02d_spi_resume(struct device *dev)
 105 {
 106         struct spi_device *spi = to_spi_device(dev);
 107         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 108
 109         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 110                 lis3lv02d_poweron(lis3);
 111
 112         return 0;
 113 }
 114 #endif
 115
 116 static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
 117                          lis3lv02d_spi_resume);
 118
 119 static struct spi_driver lis302dl_spi_driver = {
 120         .driver  = {
 121                 .name   = DRV_NAME,
 122                 .owner  = THIS_MODULE,
 123                 .pm     = &lis3lv02d_spi_pm,
 124         },
 125         .probe  = lis302dl_spi_probe,
 126         .remove = __devexit_p(lis302dl_spi_remove),
 127 };
 128
 129 static int __init lis302dl_init(void)
 130 {
 131         return spi_register_driver(&lis302dl_spi_driver);
 132 }
 133
 134 static void __exit lis302dl_exit(void)
 135 {
 136         spi_unregister_driver(&lis302dl_spi_driver);
 137 }
 138
 139 module_init(lis302dl_init);
 140 module_exit(lis302dl_exit);
 141
 142 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 143 MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
 144 MODULE_LICENSE("GPL");
 145 MODULE_ALIAS("spi:" DRV_NAME);