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