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 #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
  29 static 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
  40 static 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
  47 static 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
  61 static union axis_conversion lis3lv02d_axis_normal =
  62         { .as_array = { 1, 2, 3 } };
  63
  64 #ifdef CONFIG_OF
  65 static struct of_device_id lis302dl_spi_dt_ids[] = {
  66         { .compatible = "st,lis302dl-spi" },
  67         {}
  68 };
  69 MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
  70 #endif
  71
  72 static 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
 103 static 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
 113 static 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
 124 static 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
 136 static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
 137                          lis3lv02d_spi_resume);
 138
 139 static 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
 150 module_spi_driver(lis302dl_spi_driver);
 151
 152 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 153 MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
 154 MODULE_LICENSE("GPL");
 155 MODULE_ALIAS("spi:" DRV_NAME);