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95 lines
2.2 KiB
95 lines
2.2 KiB
9 years ago
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--- a/drivers/misc/Makefile
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+++ b/drivers/misc/Makefile
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@@ -56,3 +56,4 @@ obj-$(CONFIG_GENWQE) += genwqe/
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obj-$(CONFIG_ECHO) += echo/
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obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o
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obj-$(CONFIG_CXL_BASE) += cxl/
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+obj-$(CONFIG_SOC_MT7620) += linkit.o
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--- /dev/null
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+++ b/drivers/misc/linkit.c
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@@ -0,0 +1,84 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * publishhed by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/of.h>
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+#include <linux/mtd/mtd.h>
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+#include <linux/gpio.h>
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+
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+#define LINKIT_LATCH_GPIO 11
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+
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+struct linkit_hw_data {
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+ char board[16];
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+ char rev[16];
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+};
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+
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+static void sanify_string(char *s)
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+{
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+ int i;
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+
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+ for (i = 0; i < 15; i++)
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+ if (s[i] <= 0x20)
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+ s[i] = '\0';
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+ s[15] = '\0';
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+}
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+
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+static int linkit_probe(struct platform_device *pdev)
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+{
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+ struct linkit_hw_data hw;
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+ struct mtd_info *mtd;
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+ size_t retlen;
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+ int ret;
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+
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+ mtd = get_mtd_device_nm("factory");
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+ if (IS_ERR(mtd))
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+ return PTR_ERR(mtd);
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+
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+ ret = mtd_read(mtd, 0x400, sizeof(hw), &retlen, (u_char *) &hw);
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+ put_mtd_device(mtd);
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+
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+ sanify_string(hw.board);
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+ sanify_string(hw.rev);
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+
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+ dev_info(&pdev->dev, "Version : %s\n", hw.board);
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+ dev_info(&pdev->dev, "Revision : %s\n", hw.rev);
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+
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+ if (!strcmp(hw.board, "LINKITS7688")) {
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+ dev_info(&pdev->dev, "setting up bootstrap latch\n");
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+
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+ if (devm_gpio_request(&pdev->dev, LINKIT_LATCH_GPIO, "bootstrap")) {
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+ dev_err(&pdev->dev, "failed to setup bootstrap gpio\n");
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+ return -1;
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+ }
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+ gpio_direction_output(LINKIT_LATCH_GPIO, 0);
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id linkit_match[] = {
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+ { .compatible = "mediatek,linkit" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, linkit_match);
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+
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+static struct platform_driver linkit_driver = {
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+ .probe = linkit_probe,
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+ .driver = {
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+ .name = "mtk-linkit",
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+ .owner = THIS_MODULE,
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+ .of_match_table = linkit_match,
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+ },
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+};
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+
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+int __init linkit_init(void)
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+{
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+ return platform_driver_register(&linkit_driver);
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+}
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+late_initcall_sync(linkit_init);
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