root/drivers/misc/lis3lv02d/lis3lv02d_spi.c

DEFINITIONS

1. lis3_spi_read
2. lis3_spi_write
3. lis3_spi_init
4. lis302dl_spi_probe
5. lis302dl_spi_remove
6. lis3lv02d_spi_suspend
7. lis3lv02d_spi_resume

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * lis3lv02d_spi - SPI glue layer for lis3lv02d
   4  *
   5  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   6  */
   7 
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/err.h>
  11 #include <linux/input.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/pm.h>
  16 #include <linux/of.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/of_device.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 #ifdef CONFIG_OF
  61 static const struct of_device_id lis302dl_spi_dt_ids[] = {
  62         { .compatible = "st,lis302dl-spi" },
  63         {}
  64 };
  65 MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
  66 #endif
  67 
  68 static int lis302dl_spi_probe(struct spi_device *spi)
  69 {
  70         int ret;
  71 
  72         spi->bits_per_word = 8;
  73         spi->mode = SPI_MODE_0;
  74         ret = spi_setup(spi);
  75         if (ret < 0)
  76                 return ret;
  77 
  78         lis3_dev.bus_priv       = spi;
  79         lis3_dev.init           = lis3_spi_init;
  80         lis3_dev.read           = lis3_spi_read;
  81         lis3_dev.write          = lis3_spi_write;
  82         lis3_dev.irq            = spi->irq;
  83         lis3_dev.ac             = lis3lv02d_axis_normal;
  84         lis3_dev.pdata          = spi->dev.platform_data;
  85 
  86 #ifdef CONFIG_OF
  87         if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
  88                 lis3_dev.of_node = spi->dev.of_node;
  89                 ret = lis3lv02d_init_dt(&lis3_dev);
  90                 if (ret)
  91                         return ret;
  92         }
  93 #endif
  94         spi_set_drvdata(spi, &lis3_dev);
  95 
  96         return lis3lv02d_init_device(&lis3_dev);
  97 }
  98 
  99 static int lis302dl_spi_remove(struct spi_device *spi)
 100 {
 101         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 102         lis3lv02d_joystick_disable(lis3);
 103         lis3lv02d_poweroff(lis3);
 104 
 105         return lis3lv02d_remove_fs(&lis3_dev);
 106 }
 107 
 108 #ifdef CONFIG_PM_SLEEP
 109 static int lis3lv02d_spi_suspend(struct device *dev)
 110 {
 111         struct spi_device *spi = to_spi_device(dev);
 112         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 113 
 114         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 115                 lis3lv02d_poweroff(&lis3_dev);
 116 
 117         return 0;
 118 }
 119 
 120 static int lis3lv02d_spi_resume(struct device *dev)
 121 {
 122         struct spi_device *spi = to_spi_device(dev);
 123         struct lis3lv02d *lis3 = spi_get_drvdata(spi);
 124 
 125         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 126                 lis3lv02d_poweron(lis3);
 127 
 128         return 0;
 129 }
 130 #endif
 131 
 132 static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
 133                          lis3lv02d_spi_resume);
 134 
 135 static struct spi_driver lis302dl_spi_driver = {
 136         .driver  = {
 137                 .name   = DRV_NAME,
 138                 .pm     = &lis3lv02d_spi_pm,
 139                 .of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
 140         },
 141         .probe  = lis302dl_spi_probe,
 142         .remove = lis302dl_spi_remove,
 143 };
 144 
 145 module_spi_driver(lis302dl_spi_driver);
 146 
 147 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 148 MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
 149 MODULE_LICENSE("GPL");
 150 MODULE_ALIAS("spi:" DRV_NAME);