123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400 |
- From 2c1fab89e83245a520871e807e233e66cbdb7c57 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.
- 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>
- --
- Changes in v2:
- -Change devicetree bindings to use a per key subnode, like gpio-keys does
- ---
- .../devicetree/bindings/input/sun4i-lradc-keys.txt | 62 +++++
- MAINTAINERS | 7 +
- drivers/input/keyboard/Kconfig | 10 +
- drivers/input/keyboard/Makefile | 1 +
- drivers/input/keyboard/sun4i-lradc-keys.c | 258 +++++++++++++++++++++
- 5 files changed, 338 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 +1,62 @@
- +Allwinner sun4i low res adc attached tablet keys
- +------------------------------------------------
- +
- +Required properties:
- + - compatible: "allwinner,sun4i-a10-lradc-keys"
- + - reg: mmio address range of the chip
- + - interrupts: interrupt to which the chip is connected
- + - vref-supply: powersupply for the lradc reference voltage
- +
- +Each key is represented as a sub-node of "allwinner,sun4i-a10-lradc-keys":
- +
- +Required subnode-properties:
- + - label: Descriptive name of the key.
- + - linux,code: Keycode to emit.
- + - channel: Channel this key is attached to, mut be 0 or 1.
- + - voltage: Voltage in µV at lradc input when this key is pressed.
- +
- +Example:
- +
- +#include <dt-bindings/input/input.h>
- +
- + lradc: lradc@01c22800 {
- + compatible = "allwinner,sun4i-a10-lradc-keys";
- + reg = <0x01c22800 0x100>;
- + interrupts = <31>;
- + vref-supply = <®_vcc3v0>;
- +
- + button@191 {
- + label = "Volume Up";
- + linux,code = <KEY_VOLUMEUP>;
- + channel = <0>;
- + voltage = <191274>;
- + };
- +
- + button@392 {
- + label = "Volume Down";
- + linux,code = <KEY_VOLUMEDOWN>;
- + channel = <0>;
- + voltage = <392644>;
- + };
- +
- + button@601 {
- + label = "Menu";
- + linux,code = <KEY_MENU>;
- + channel = <0>;
- + voltage = <601151>;
- + };
- +
- + button@795 {
- + label = "Enter";
- + linux,code = <KEY_ENTER>;
- + channel = <0>;
- + voltage = <795090>;
- + };
- +
- + button@987 {
- + label = "Home";
- + linux,code = <KEY_HOMEPAGE>;
- + channel = <0>;
- + voltage = <987387>;
- + };
- + };
- --- a/MAINTAINERS
- +++ b/MAINTAINERS
- @@ -9015,6 +9015,13 @@ F: arch/m68k/sun3*/
- F: arch/m68k/include/asm/sun3*
- F: drivers/net/ethernet/i825xx/sun3*
-
- +SUN4I LOW RES ADC ATTACHED TABLET KEYS DRIVER
- +M: Hans de Goede <hdegoede@redhat.com>
- +L: linux-input@vger.kernel.org
- +S: Maintained
- +F: Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
- +F: drivers/input/keyboard/sun4i-lradc-keys.c
- +
- SUNDANCE NETWORK DRIVER
- M: Denis Kirjanov <kda@linux-powerpc.org>
- L: netdev@vger.kernel.org
- --- a/drivers/input/keyboard/Kconfig
- +++ b/drivers/input/keyboard/Kconfig
- @@ -567,6 +567,16 @@ 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
- @@ -53,6 +53,7 @@ obj-$(CONFIG_KEYBOARD_SPEAR) += spear-k
- obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o
- obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
- obj-$(CONFIG_KEYBOARD_ST_KEYSCAN) += st-keyscan.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 +1,258 @@
- +/*
- + * 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 channel 0 since
- + * there are no boards known to use channel 1.
- + */
- +
- +#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/regulator/consumer.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)
- +
- +struct sun4i_lradc_keymap {
- + u32 voltage;
- + u32 keycode;
- +};
- +
- +struct sun4i_lradc_data {
- + struct device *dev;
- + struct input_dev *input;
- + void __iomem *base;
- + struct regulator *vref_supply;
- + struct sun4i_lradc_keymap *chan0_map;
- + u32 chan0_map_count;
- + u32 chan0_keycode;
- + u32 vref;
- +};
- +
- +static irqreturn_t sun4i_lradc_irq(int irq, void *dev_id)
- +{
- + struct sun4i_lradc_data *lradc = dev_id;
- + u32 i, ints, val, voltage, diff, keycode = 0, closest = 0xffffffff;
- +
- + 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) & 0x3f;
- + voltage = val * lradc->vref / 63;
- +
- + for (i = 0; i < lradc->chan0_map_count; i++) {
- + diff = abs(lradc->chan0_map[i].voltage - voltage);
- + if (diff < closest) {
- + closest = diff;
- + keycode = lradc->chan0_map[i].keycode;
- + }
- + }
- +
- + lradc->chan0_keycode = keycode;
- + 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);
- + int ret;
- +
- + ret = regulator_enable(lradc->vref_supply);
- + if (ret)
- + return ret;
- +
- + /* lradc Vref internally is divided by 2/3 */
- + lradc->vref = regulator_get_voltage(lradc->vref_supply) * 2 / 3;
- +
- + /*
- + * Set sample time to 4 ms / 250 Hz. Wait 2 * 4 ms for key to
- + * stabilize on press, wait (1 + 1) * 4 ms for key release
- + */
- + writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
- + SAMPLE_RATE(0) | 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);
- +
- + regulator_disable(lradc->vref_supply);
- +}
- +
- +static int sun4i_lradc_probe(struct platform_device *pdev)
- +{
- + struct sun4i_lradc_data *lradc;
- + struct device *dev = &pdev->dev;
- + struct device_node *pp, *np = dev->of_node;
- + u32 channel;
- + int i, ret;
- +
- + lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
- + if (!lradc)
- + return -ENOMEM;
- +
- + lradc->chan0_map_count = of_get_child_count(np);
- + lradc->chan0_map = devm_kmalloc(dev, lradc->chan0_map_count *
- + sizeof(struct sun4i_lradc_keymap), GFP_KERNEL);
- + if (!lradc->chan0_map)
- + return -ENOMEM;
- +
- + i = 0;
- + for_each_child_of_node(np, pp) {
- + struct sun4i_lradc_keymap *map = &lradc->chan0_map[i];
- +
- + ret = of_property_read_u32(pp, "channel", &channel);
- + if (ret || channel != 0) {
- + dev_err(dev, "%s: Inval channel prop\n", pp->name);
- + return -EINVAL;
- + }
- +
- + ret = of_property_read_u32(pp, "voltage", &map->voltage);
- + if (ret) {
- + dev_err(dev, "%s: Inval voltage prop\n", pp->name);
- + return -EINVAL;
- + }
- +
- + ret = of_property_read_u32(pp, "linux,code", &map->keycode);
- + if (ret) {
- + dev_err(dev, "%s: Inval linux,code prop\n", pp->name);
- + return -EINVAL;
- + }
- +
- + i++;
- + }
- +
- + lradc->vref_supply = devm_regulator_get(dev, "vref");
- + if (IS_ERR(lradc->vref_supply))
- + return PTR_ERR(lradc->vref_supply);
- +
- + 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 < lradc->chan0_map_count; i++)
- + set_bit(lradc->chan0_map[i].keycode, 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-a10-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-a10-lradc-keys", },
- + { /* sentinel */ }
- +};
- +MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);
- +
- +static struct platform_driver sun4i_lradc_driver = {
- + .driver = {
- + .name = "sun4i-a10-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");
|