mirror of https://github.com/hak5/openwrt-owl.git
327 lines
10 KiB
Diff
327 lines
10 KiB
Diff
From 3f8fd9b9e2daefb7be4c46369f86af1c7bb2f1ca Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Wed, 1 Jan 2014 19:44:49 +0100
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Subject: [PATCH] input: Add new sun4i-lradc-keys driver
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Allwinnner sunxi SoCs have a low resolution adc (called lradc) which is
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specifically designed to have various (tablet) keys (ie home, back, search,
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etc). attached to it using a resistor network. This adds a driver for this.
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There are 2 channels, currently this driver only supports chan0 since there
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are no boards known to use chan1. The devicetree properties are already
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prefixed with chan0 as preparation for chan1 support in the future.
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This has been tested on an olimex a10s-olinuxino-micro, a13-olinuxino, and
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a20-olinuxino-micro.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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.../devicetree/bindings/input/sun4i-lradc-keys.txt | 22 ++
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drivers/input/keyboard/Kconfig | 10 +
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drivers/input/keyboard/Makefile | 1 +
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drivers/input/keyboard/sun4i-lradc-keys.c | 243 +++++++++++++++++++++
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4 files changed, 276 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
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create mode 100644 drivers/input/keyboard/sun4i-lradc-keys.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
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@@ -0,0 +1,22 @@
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+Allwinner sun4i low res adc attached tablet keys
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+------------------------------------------------
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+
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+Required properties:
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+ - compatible: "allwinner,sun4i-lradc-keys"
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+ - reg: mmio address range of the chip
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+ - interrupts: interrupt to which the chip is connected
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+ - allwinner,chan0-step: step in mV between keys must be 150 or 200
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+ - linux,chan0-keycodes: array of dt-bindings/input/input.h KEY_ codes
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+
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+Example:
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+
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+#include <dt-bindings/input/input.h>
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+
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+ lradc: lradc@01c22800 {
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+ compatible = "allwinner,sun4i-lradc-keys";
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+ reg = <0x01c22800 0x100>;
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+ interrupts = <31>;
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+ allwinner,chan0-step = <200>;
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+ linux,chan0-keycodes = <KEY_VOLUMEUP KEY_VOLUMEDOWN
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+ KEY_MENU KEY_ENTER KEY_HOME>;
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+ };
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--- a/drivers/input/keyboard/Kconfig
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+++ b/drivers/input/keyboard/Kconfig
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@@ -544,6 +544,16 @@ config KEYBOARD_STMPE
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To compile this driver as a module, choose M here: the module will be
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called stmpe-keypad.
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+config KEYBOARD_SUN4I_LRADC
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+ tristate "Allwinner sun4i low res adc attached tablet keys support"
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+ depends on ARCH_SUNXI
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+ help
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+ This selects support for the Allwinner low res adc attached tablet
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+ keys found on Allwinner sunxi SoCs.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called sun4i-lradc-keys.
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+
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config KEYBOARD_DAVINCI
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tristate "TI DaVinci Key Scan"
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depends on ARCH_DAVINCI_DM365
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--- a/drivers/input/keyboard/Makefile
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+++ b/drivers/input/keyboard/Makefile
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@@ -50,6 +50,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_k
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obj-$(CONFIG_KEYBOARD_SPEAR) += spear-keyboard.o
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obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o
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obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
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+obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) += sun4i-lradc-keys.o
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obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
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obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
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obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
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--- /dev/null
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+++ b/drivers/input/keyboard/sun4i-lradc-keys.c
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@@ -0,0 +1,243 @@
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+/*
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+ * Allwinner sun4i low res adc attached tablet keys driver
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+ *
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+ * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
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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 as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+/*
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+ * Allwinnner sunxi SoCs have a lradc which is specifically designed to have
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+ * various (tablet) keys (ie home, back, search, etc). attached to it using
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+ * a resistor network. This driver is for the keys on such boards.
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+ *
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+ * There are 2 channels, currently this driver only supports chan0 since there
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+ * are no boards known to use chan1. The devicetree properties are already
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+ * prefixed with chan0 as preparation for chan1 support in the future.
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+ */
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+
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+#include <linux/err.h>
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+#include <linux/init.h>
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+#include <linux/input.h>
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+#include <linux/interrupt.h>
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+#include <linux/io.h>
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+#include <linux/module.h>
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+#include <linux/of_platform.h>
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+#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+
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+#define LRADC_CTRL 0x00
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+#define LRADC_INTC 0x04
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+#define LRADC_INTS 0x08
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+#define LRADC_DATA0 0x0c
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+#define LRADC_DATA1 0x10
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+
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+/* LRADC_CTRL bits */
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+#define FIRST_CONVERT_DLY(x) ((x) << 24) /* 8 bits */
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+#define CHAN_SELECT(x) ((x) << 22) /* 2 bits */
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+#define CONTINUE_TIME_SEL(x) ((x) << 16) /* 4 bits */
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+#define KEY_MODE_SEL(x) ((x) << 12) /* 2 bits */
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+#define LEVELA_B_CNT(x) ((x) << 8) /* 4 bits */
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+#define HOLD_EN(x) ((x) << 6)
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+#define LEVELB_VOL(x) ((x) << 4) /* 2 bits */
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+#define SAMPLE_RATE(x) ((x) << 2) /* 2 bits */
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+#define ENABLE(x) ((x) << 0)
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+
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+/* LRADC_INTC and LRADC_INTS bits */
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+#define CHAN1_KEYUP_IRQ BIT(12)
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+#define CHAN1_ALRDY_HOLD_IRQ BIT(11)
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+#define CHAN1_HOLD_IRQ BIT(10)
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+#define CHAN1_KEYDOWN_IRQ BIT(9)
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+#define CHAN1_DATA_IRQ BIT(8)
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+#define CHAN0_KEYUP_IRQ BIT(4)
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+#define CHAN0_ALRDY_HOLD_IRQ BIT(3)
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+#define CHAN0_HOLD_IRQ BIT(2)
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+#define CHAN0_KEYDOWN_IRQ BIT(1)
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+#define CHAN0_DATA_IRQ BIT(0)
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+
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+#define MAX_KEYS 13
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+
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+/* Lookup table to map the adc val to a keycode index for 150 mv step size */
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+static const u8 adc_val_to_key_index_step150[64] = {
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+ 0, 0, 0,
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+ 1, 1, 1, 1, 1,
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+ 2, 2, 2, 2, 2,
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+ 3, 3, 3, 3,
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+ 4, 4, 4, 4, 4,
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+ 5, 5, 5, 5, 5,
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+ 6, 6, 6, 6, 6,
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+ 7, 7, 7, 7,
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+ 8, 8, 8, 8, 8,
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+ 9, 9, 9, 9, 9,
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+ 10, 10, 10, 10,
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+ 11, 11, 11, 11,
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+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12
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+};
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+
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+/* Lookup table to map the adc val to a keycode index for 200 mv step size */
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+static const u8 adc_val_to_key_index_step200[64] = {
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+ 0, 0, 0, 0, 0, 0, 0, 0,
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+ 1, 1, 1, 1, 1, 1, 1,
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+ 2, 2, 2, 2, 2, 2, 2,
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+ 3, 3, 3, 3, 3, 3,
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+ 4, 4, 4, 4, 4, 4,
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+ 5, 5, 5, 5, 5, 5,
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+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
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+};
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+
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+struct sun4i_lradc_data {
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+ struct device *dev;
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+ struct input_dev *input;
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+ void __iomem *base;
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+ u32 chan0_step;
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+ u32 chan0_keycode;
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+ u32 chan0_keycodes[MAX_KEYS];
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+};
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+
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+static irqreturn_t sun4i_lradc_irq(int irq, void *dev_id)
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+{
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+ struct sun4i_lradc_data *lradc = dev_id;
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+ u32 ints, val;
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+
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+ ints = readl(lradc->base + LRADC_INTS);
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+
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+ /*
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+ * lradc supports only one keypress at a time, release does not give
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+ * any info as to which key was released, so we cache the keycode.
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+ */
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+ if ((ints & CHAN0_KEYDOWN_IRQ) && lradc->chan0_keycode == 0) {
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+ val = readl(lradc->base + LRADC_DATA0);
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+ if (lradc->chan0_step == 150)
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+ val = adc_val_to_key_index_step150[val];
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+ else
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+ val = adc_val_to_key_index_step200[val];
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+
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+ lradc->chan0_keycode = lradc->chan0_keycodes[val];
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+ input_report_key(lradc->input, lradc->chan0_keycode, 1);
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+ }
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+
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+ if (ints & CHAN0_KEYUP_IRQ) {
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+ input_report_key(lradc->input, lradc->chan0_keycode, 0);
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+ lradc->chan0_keycode = 0;
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+ }
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+
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+ input_sync(lradc->input);
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+
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+ writel(ints, lradc->base + LRADC_INTS);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int sun4i_lradc_open(struct input_dev *dev)
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+{
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+ struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
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+
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+ /*
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+ * Set sample time to 16 ms / 62.5 Hz. Wait 2 * 16 ms for key to
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+ * stabilize on press, wait (1 + 1) * 16 ms for key release
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+ */
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+ writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
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+ SAMPLE_RATE(2) | ENABLE(1), lradc->base + LRADC_CTRL);
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+
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+ writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC);
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+
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+ return 0;
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+}
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+
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+static void sun4i_lradc_close(struct input_dev *dev)
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+{
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+ struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
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+
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+ /* Disable lradc, leave other settings unchanged */
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+ writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
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+ SAMPLE_RATE(2), lradc->base + LRADC_CTRL);
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+ writel(0, lradc->base + LRADC_INTC);
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+}
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+
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+static int sun4i_lradc_probe(struct platform_device *pdev)
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+{
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+ struct sun4i_lradc_data *lradc;
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+ struct device *dev = &pdev->dev;
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+ struct device_node *np = dev->of_node;
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+ int i, ret;
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+
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+ lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
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+ if (!lradc)
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+ return -ENOMEM;
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+
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+ ret = of_property_read_u32(np, "allwinner,chan0-step",
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+ &lradc->chan0_step);
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+ if (ret || (lradc->chan0_step != 150 && lradc->chan0_step != 200)) {
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+ dev_err(dev, "Invalid allwinner,chan0-step dt-property\n");
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+ return -EINVAL;
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+ }
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+
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+ for (i = 0; i < MAX_KEYS; i++)
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+ of_property_read_u32_index(np, "linux,chan0-keycodes",
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+ i, &lradc->chan0_keycodes[i]);
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+
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+ lradc->dev = dev;
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+ lradc->input = devm_input_allocate_device(dev);
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+ if (!lradc->input)
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+ return -ENOMEM;
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+
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+ lradc->input->name = pdev->name;
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+ lradc->input->phys = "sun4i_lradc/input0";
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+ lradc->input->open = sun4i_lradc_open;
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+ lradc->input->close = sun4i_lradc_close;
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+ lradc->input->id.bustype = BUS_HOST;
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+ lradc->input->id.vendor = 0x0001;
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+ lradc->input->id.product = 0x0001;
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+ lradc->input->id.version = 0x0100;
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+ lradc->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY);
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+ for (i = 0; i < MAX_KEYS; i++)
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+ set_bit(lradc->chan0_keycodes[i], lradc->input->keybit);
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+ input_set_drvdata(lradc->input, lradc);
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+
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+ lradc->base = devm_ioremap_resource(dev,
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+ platform_get_resource(pdev, IORESOURCE_MEM, 0));
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+ if (IS_ERR(lradc->base))
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+ return PTR_ERR(lradc->base);
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+
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+ ret = devm_request_irq(dev, platform_get_irq(pdev, 0), sun4i_lradc_irq,
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+ 0, "sun4i-lradc-keys", lradc);
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+ if (ret)
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+ return ret;
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+
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+ ret = input_register_device(lradc->input);
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+ if (ret)
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+ return ret;
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+
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+ platform_set_drvdata(pdev, lradc);
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+ return 0;
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+}
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+
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+static const struct of_device_id sun4i_lradc_of_match[] = {
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+ { .compatible = "allwinner,sun4i-lradc-keys", },
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+ { /* sentinel */ }
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+};
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+MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);
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+
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+static struct platform_driver sun4i_lradc_driver = {
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "sun4i-lradc-keys",
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+ .of_match_table = of_match_ptr(sun4i_lradc_of_match),
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+ },
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+ .probe = sun4i_lradc_probe,
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+};
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+
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+module_platform_driver(sun4i_lradc_driver);
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+
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+MODULE_DESCRIPTION("Allwinner sun4i low res adc attached tablet keys driver");
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+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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+MODULE_LICENSE("GPL");
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