diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.18/110-input-add-sun4i-lradc.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.18/110-input-add-sun4i-lradc.patch | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/target/linux/sunxi/patches-3.18/110-input-add-sun4i-lradc.patch b/target/linux/sunxi/patches-3.18/110-input-add-sun4i-lradc.patch deleted file mode 100644 index 12b4628f04..0000000000 --- a/target/linux/sunxi/patches-3.18/110-input-add-sun4i-lradc.patch +++ /dev/null @@ -1,400 +0,0 @@ -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 -@@ -9002,6 +9002,13 @@ 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"); |