target/linux/brcm47xx/patches-3.10/121-MIPS-BCM47XX-Prepare-support-for-GPIO-buttons.patch

   1 From e352ec3c581df40f159771b30c262c2bc7fb802e Mon Sep 17 00:00:00 2001
   2 From: Rafa? Mi?ecki <zajec5@gmail.com>
   3 Date: Thu, 2 Jan 2014 13:31:32 +0100
   4 Subject: [PATCH 030/110] MIPS: BCM47XX: Prepare support for GPIO buttons
   5
   6 So far this adds support for one Netgear model only, but it's designed
   7 and ready to add many more device. We could hopefully import database
   8 from OpenWrt.
   9 Support for SSB is currently disabled, because SSB doesn't implement IRQ
  10 domain yet.
  11
  12 Signed-off-by: Rafa? Mi?ecki <zajec5@gmail.com>
  13 Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
  14 Acked-by: John Crispin <blogic@openwrt.org>
  15 Patchwork: http://patchwork.linux-mips.org/patch/6300/
  16 ---
  17  arch/mips/bcm47xx/Makefile          |    2 +-
  18  arch/mips/bcm47xx/bcm47xx_private.h |    3 ++
  19  arch/mips/bcm47xx/buttons.c         |   95 +++++++++++++++++++++++++++++++++++
  20  arch/mips/bcm47xx/setup.c           |    1 +
  21  4 files changed, 100 insertions(+), 1 deletion(-)
  22  create mode 100644 arch/mips/bcm47xx/buttons.c
  23
  24 --- a/arch/mips/bcm47xx/Makefile
  25 +++ b/arch/mips/bcm47xx/Makefile
  26 @@ -4,5 +4,5 @@
  27  #
  28
  29  obj-y                          += irq.o nvram.o prom.o serial.o setup.o time.o sprom.o
  30 -obj-y                          += board.o leds.o
  31 +obj-y                          += board.o buttons.o leds.o
  32  obj-$(CONFIG_BCM47XX_SSB)      += wgt634u.o
  33 --- a/arch/mips/bcm47xx/bcm47xx_private.h
  34 +++ b/arch/mips/bcm47xx/bcm47xx_private.h
  35 @@ -3,6 +3,9 @@
  36
  37  #include <linux/kernel.h>
  38
  39 +/* buttons.c */
  40 +int __init bcm47xx_buttons_register(void);
  41 +
  42  /* leds.c */
  43  void __init bcm47xx_leds_register(void);
  44
  45 --- /dev/null
  46 +++ b/arch/mips/bcm47xx/buttons.c
  47 @@ -0,0 +1,95 @@
  48 +#include "bcm47xx_private.h"
  49 +
  50 +#include <linux/input.h>
  51 +#include <linux/gpio_keys.h>
  52 +#include <linux/interrupt.h>
  53 +#include <linux/ssb/ssb_embedded.h>
  54 +#include <bcm47xx_board.h>
  55 +#include <bcm47xx.h>
  56 +
  57 +/**************************************************
  58 + * Database
  59 + **************************************************/
  60 +
  61 +static const struct gpio_keys_button
  62 +bcm47xx_buttons_netgear_wndr4500_v1[] __initconst = {
  63 +       {
  64 +               .code           = KEY_WPS_BUTTON,
  65 +               .gpio           = 4,
  66 +               .active_low     = 1,
  67 +       },
  68 +       {
  69 +               .code           = KEY_RFKILL,
  70 +               .gpio           = 5,
  71 +               .active_low     = 1,
  72 +       },
  73 +       {
  74 +               .code           = KEY_RESTART,
  75 +               .gpio           = 6,
  76 +               .active_low     = 1,
  77 +       },
  78 +};
  79 +
  80 +/**************************************************
  81 + * Init
  82 + **************************************************/
  83 +
  84 +static struct gpio_keys_platform_data bcm47xx_button_pdata;
  85 +
  86 +static struct platform_device bcm47xx_buttons_gpio_keys = {
  87 +       .name = "gpio-keys",
  88 +       .dev = {
  89 +               .platform_data = &bcm47xx_button_pdata,
  90 +       }
  91 +};
  92 +
  93 +/* Copy data from __initconst */
  94 +static int __init bcm47xx_buttons_copy(const struct gpio_keys_button *buttons,
  95 +                                      size_t nbuttons)
  96 +{
  97 +       size_t size = nbuttons * sizeof(*buttons);
  98 +
  99 +       bcm47xx_button_pdata.buttons = kmalloc(size, GFP_KERNEL);
 100 +       if (!bcm47xx_button_pdata.buttons)
 101 +               return -ENOMEM;
 102 +       memcpy(bcm47xx_button_pdata.buttons, buttons, size);
 103 +       bcm47xx_button_pdata.nbuttons = nbuttons;
 104 +
 105 +       return 0;
 106 +}
 107 +
 108 +#define bcm47xx_copy_bdata(dev_buttons)                                        \
 109 +       bcm47xx_buttons_copy(dev_buttons, ARRAY_SIZE(dev_buttons));
 110 +
 111 +int __init bcm47xx_buttons_register(void)
 112 +{
 113 +       enum bcm47xx_board board = bcm47xx_board_get();
 114 +       int err;
 115 +
 116 +#ifdef CONFIG_BCM47XX_SSB
 117 +       if (bcm47xx_bus_type == BCM47XX_BUS_TYPE_SSB) {
 118 +               pr_debug("Buttons on SSB are not supported yet.\n");
 119 +               return -ENOTSUPP;
 120 +       }
 121 +#endif
 122 +
 123 +       switch (board) {
 124 +       case BCM47XX_BOARD_NETGEAR_WNDR4500V1:
 125 +               err = bcm47xx_copy_bdata(bcm47xx_buttons_netgear_wndr4500_v1);
 126 +               break;
 127 +       default:
 128 +               pr_debug("No buttons configuration found for this device\n");
 129 +               return -ENOTSUPP;
 130 +       }
 131 +
 132 +       if (err)
 133 +               return -ENOMEM;
 134 +
 135 +       err = platform_device_register(&bcm47xx_buttons_gpio_keys);
 136 +       if (err) {
 137 +               pr_err("Failed to register platform device: %d\n", err);
 138 +               return err;
 139 +       }
 140 +
 141 +       return 0;
 142 +}
 143 --- a/arch/mips/bcm47xx/setup.c
 144 +++ b/arch/mips/bcm47xx/setup.c
 145 @@ -246,6 +246,7 @@ static int __init bcm47xx_register_bus_c
 146  #endif
 147         }
 148
 149 +       bcm47xx_buttons_register();
 150         bcm47xx_leds_register();
 151
 152         return 0;