drivers/pcmcia/pxa2xx_hx4700.c

   1 /*
   2  *  Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License version 2 as
   6  *  published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio.h>
  13 #include <linux/irq.h>
  14
  15 #include <asm/mach-types.h>
  16 #include <mach/hx4700.h>
  17
  18 #include "soc_common.h"
  19
  20 static struct gpio gpios[] = {
  21         { GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
  22         { EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
  23 };
  24
  25 static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  26 {
  27         int ret;
  28
  29         ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
  30         if (ret)
  31                 goto out;
  32
  33         /*
  34          * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
  35          * The asic3 default IRQ type is level trigger low level detect, exactly
  36          * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
  37          * If the IRQ type is not changed, the asic3 interrupt handler will loop
  38          * repeatedly because it is unable to clear the level trigger interrupt.
  39          */
  40         irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);
  41
  42         skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
  43         skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
  44         skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
  45         skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
  46
  47 out:
  48         return ret;
  49 }
  50
  51 static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  52 {
  53         gpio_free_array(gpios, ARRAY_SIZE(gpios));
  54 }
  55
  56 static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  57         struct pcmcia_state *state)
  58 {
  59         state->vs_3v = 1;
  60         state->vs_Xv = 0;
  61 }
  62
  63 static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  64         const socket_state_t *state)
  65 {
  66         switch (state->Vcc) {
  67         case 0:
  68                 gpio_set_value(EGPIO4_CF_3V3_ON, 0);
  69                 break;
  70         case 33:
  71                 gpio_set_value(EGPIO4_CF_3V3_ON, 1);
  72                 break;
  73         default:
  74                 printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
  75                 return -EINVAL;
  76         }
  77
  78         gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);
  79
  80         return 0;
  81 }
  82
  83 static struct pcmcia_low_level hx4700_pcmcia_ops = {
  84         .owner          = THIS_MODULE,
  85         .nr             = 1,
  86         .hw_init        = hx4700_pcmcia_hw_init,
  87         .hw_shutdown    = hx4700_pcmcia_hw_shutdown,
  88         .socket_state   = hx4700_pcmcia_socket_state,
  89         .configure_socket = hx4700_pcmcia_configure_socket,
  90 };
  91
  92 static struct platform_device *hx4700_pcmcia_device;
  93
  94 static int __init hx4700_pcmcia_init(void)
  95 {
  96         struct platform_device *pdev;
  97
  98         if (!machine_is_h4700())
  99                 return -ENODEV;
 100
 101         pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
 102                 &hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
 103         if (IS_ERR(pdev))
 104                 return PTR_ERR(pdev);
 105
 106         hx4700_pcmcia_device = pdev;
 107
 108         return 0;
 109 }
 110
 111 static void __exit hx4700_pcmcia_exit(void)
 112 {
 113         platform_device_unregister(hx4700_pcmcia_device);
 114 }
 115
 116 module_init(hx4700_pcmcia_init);
 117 module_exit(hx4700_pcmcia_exit);
 118
 119 MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
 120 MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
 121 MODULE_LICENSE("GPL");