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/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
  28 static 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
  39 static 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
  46 static 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
  60 static union axis_conversion lis3lv02d_axis_normal =
  61         { .as_array = { 1, 2, 3 } };
  62
  63 #ifdef CONFIG_OF
  64 static const struct of_device_id lis302dl_spi_dt_ids[] = {
  65         { .compatible = "st,lis302dl-spi" },
  66         {}
  67 };
  68 MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
  69 #endif
  70
  71 static 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
 102 static 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
 112 static 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
 123 static 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
 135 static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
 136                          lis3lv02d_spi_resume);
 137
 138 static struct spi_driver lis302dl_spi_driver = {
 139         .driver  = {
 140                 .name   = DRV_NAME,
 141                 .owner  = THIS_MODULE,
 142                 .pm     = &lis3lv02d_spi_pm,
 143                 .of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
 144         },
 145         .probe  = lis302dl_spi_probe,
 146         .remove = lis302dl_spi_remove,
 147 };
 148
 149 module_spi_driver(lis302dl_spi_driver);
 150
 151 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 152 MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
 153 MODULE_LICENSE("GPL");
 154 MODULE_ALIAS("spi:" DRV_NAME);