drivers/pcmcia/pxa2xx_palmtx.c

   1 /*
   2  * linux/drivers/pcmcia/pxa2xx_palmtx.c
   3  *
   4  * Driver for Palm T|X PCMCIA
   5  *
   6  * Copyright (C) 2007-2011 Marek Vasut <marek.vasut@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/gpio.h>
  17
  18 #include <asm/mach-types.h>
  19 #include <mach/palmtx.h>
  20 #include "soc_common.h"
  21
  22 static struct gpio palmtx_pcmcia_gpios[] = {
  23         { GPIO_NR_PALMTX_PCMCIA_POWER1, GPIOF_INIT_LOW, "PCMCIA Power 1" },
  24         { GPIO_NR_PALMTX_PCMCIA_POWER2, GPIOF_INIT_LOW, "PCMCIA Power 2" },
  25         { GPIO_NR_PALMTX_PCMCIA_RESET,  GPIOF_INIT_HIGH,"PCMCIA Reset" },
  26 };
  27
  28 static int palmtx_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  29 {
  30         int ret;
  31
  32         ret = gpio_request_array(palmtx_pcmcia_gpios,
  33                                 ARRAY_SIZE(palmtx_pcmcia_gpios));
  34
  35         skt->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTX_PCMCIA_READY;
  36         skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
  37
  38         return ret;
  39 }
  40
  41 static void palmtx_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  42 {
  43         gpio_free_array(palmtx_pcmcia_gpios, ARRAY_SIZE(palmtx_pcmcia_gpios));
  44 }
  45
  46 static void palmtx_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  47                                         struct pcmcia_state *state)
  48 {
  49         state->detect = 1; /* always inserted */
  50         state->vs_3v  = 1;
  51         state->vs_Xv  = 0;
  52 }
  53
  54 static int
  55 palmtx_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  56                                 const socket_state_t *state)
  57 {
  58         gpio_set_value(GPIO_NR_PALMTX_PCMCIA_POWER1, 1);
  59         gpio_set_value(GPIO_NR_PALMTX_PCMCIA_POWER2, 1);
  60         gpio_set_value(GPIO_NR_PALMTX_PCMCIA_RESET,
  61                         !!(state->flags & SS_RESET));
  62
  63         return 0;
  64 }
  65
  66 static struct pcmcia_low_level palmtx_pcmcia_ops = {
  67         .owner                  = THIS_MODULE,
  68
  69         .first                  = 0,
  70         .nr                     = 1,
  71
  72         .hw_init                = palmtx_pcmcia_hw_init,
  73         .hw_shutdown            = palmtx_pcmcia_hw_shutdown,
  74
  75         .socket_state           = palmtx_pcmcia_socket_state,
  76         .configure_socket       = palmtx_pcmcia_configure_socket,
  77 };
  78
  79 static struct platform_device *palmtx_pcmcia_device;
  80
  81 static int __init palmtx_pcmcia_init(void)
  82 {
  83         int ret;
  84
  85         if (!machine_is_palmtx())
  86                 return -ENODEV;
  87
  88         palmtx_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
  89         if (!palmtx_pcmcia_device)
  90                 return -ENOMEM;
  91
  92         ret = platform_device_add_data(palmtx_pcmcia_device, &palmtx_pcmcia_ops,
  93                                         sizeof(palmtx_pcmcia_ops));
  94
  95         if (!ret)
  96                 ret = platform_device_add(palmtx_pcmcia_device);
  97
  98         if (ret)
  99                 platform_device_put(palmtx_pcmcia_device);
 100
 101         return ret;
 102 }
 103
 104 static void __exit palmtx_pcmcia_exit(void)
 105 {
 106         platform_device_unregister(palmtx_pcmcia_device);
 107 }
 108
 109 module_init(palmtx_pcmcia_init);
 110 module_exit(palmtx_pcmcia_exit);
 111
 112 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 113 MODULE_DESCRIPTION("PCMCIA support for Palm T|X");
 114 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 115 MODULE_LICENSE("GPL");