target/linux/ramips/patches-4.4/0200-linkit_bootstrap.patch

   1 --- a/drivers/misc/Makefile
   2 +++ b/drivers/misc/Makefile
   3 @@ -57,3 +57,4 @@ obj-$(CONFIG_GENWQE)          += genwqe/
   4  obj-$(CONFIG_ECHO)             += echo/
   5  obj-$(CONFIG_VEXPRESS_SYSCFG)  += vexpress-syscfg.o
   6  obj-$(CONFIG_CXL_BASE)         += cxl/
   7 +obj-$(CONFIG_SOC_MT7620)       += linkit.o
   8 --- /dev/null
   9 +++ b/drivers/misc/linkit.c
  10 @@ -0,0 +1,84 @@
  11 +/*
  12 + *  This program is free software; you can redistribute it and/or modify
  13 + *  it under the terms of the GNU General Public License version 2 as
  14 + *  publishhed by the Free Software Foundation.
  15 + *
  16 + *  Copyright (C) 2015 John Crispin <blogic@openwrt.org>
  17 + */
  18 +
  19 +#include <linux/module.h>
  20 +#include <linux/platform_device.h>
  21 +#include <linux/of.h>
  22 +#include <linux/mtd/mtd.h>
  23 +#include <linux/gpio.h>
  24 +
  25 +#define LINKIT_LATCH_GPIO      11
  26 +
  27 +struct linkit_hw_data {
  28 +       char board[16];
  29 +       char rev[16];
  30 +};
  31 +
  32 +static void sanify_string(char *s)
  33 +{
  34 +       int i;
  35 +
  36 +       for (i = 0; i < 15; i++)
  37 +               if (s[i] <= 0x20)
  38 +                       s[i] = '\0';
  39 +       s[15] = '\0';
  40 +}
  41 +
  42 +static int linkit_probe(struct platform_device *pdev)
  43 +{
  44 +       struct linkit_hw_data hw;
  45 +       struct mtd_info *mtd;
  46 +       size_t retlen;
  47 +       int ret;
  48 +
  49 +       mtd = get_mtd_device_nm("factory");
  50 +       if (IS_ERR(mtd))
  51 +               return PTR_ERR(mtd);
  52 +
  53 +       ret = mtd_read(mtd, 0x400, sizeof(hw), &retlen, (u_char *) &hw);
  54 +       put_mtd_device(mtd);
  55 +
  56 +       sanify_string(hw.board);
  57 +       sanify_string(hw.rev);
  58 +
  59 +       dev_info(&pdev->dev, "Version  : %s\n", hw.board);
  60 +       dev_info(&pdev->dev, "Revision : %s\n", hw.rev);
  61 +
  62 +       if (!strcmp(hw.board, "LINKITS7688")) {
  63 +               dev_info(&pdev->dev, "setting up bootstrap latch\n");
  64 +
  65 +               if (devm_gpio_request(&pdev->dev, LINKIT_LATCH_GPIO, "bootstrap")) {
  66 +                       dev_err(&pdev->dev, "failed to setup bootstrap gpio\n");
  67 +                       return -1;
  68 +               }
  69 +               gpio_direction_output(LINKIT_LATCH_GPIO, 0);
  70 +       }
  71 +
  72 +       return 0;
  73 +}
  74 +
  75 +static const struct of_device_id linkit_match[] = {
  76 +       { .compatible = "mediatek,linkit" },
  77 +       {},
  78 +};
  79 +MODULE_DEVICE_TABLE(of, linkit_match);
  80 +
  81 +static struct platform_driver linkit_driver = {
  82 +       .probe = linkit_probe,
  83 +       .driver = {
  84 +               .name = "mtk-linkit",
  85 +               .owner = THIS_MODULE,
  86 +               .of_match_table = linkit_match,
  87 +       },
  88 +};
  89 +
  90 +int __init linkit_init(void)
  91 +{
  92 +       return platform_driver_register(&linkit_driver);
  93 +}
  94 +late_initcall_sync(linkit_init);