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