diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.13/175-lradc-add-driver.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.13/175-lradc-add-driver.patch | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.13/175-lradc-add-driver.patch b/target/linux/sunxi/patches-3.13/175-lradc-add-driver.patch new file mode 100644 index 0000000000..dc69d171b1 --- /dev/null +++ b/target/linux/sunxi/patches-3.13/175-lradc-add-driver.patch @@ -0,0 +1,339 @@ +From 14cf22b1db1b6e6b7333e8a7245055966f5497e3 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 + +diff --git a/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt b/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt +new file mode 100644 +index 0000000..7801264 +--- /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>; ++ }; +diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig +index a673c9f..d8a51cd 100644 +--- 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 +diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile +index a699b61..f3265bd 100644 +--- a/drivers/input/keyboard/Makefile ++++ b/drivers/input/keyboard/Makefile +@@ -50,6 +50,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o + obj-$(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 +diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c +new file mode 100644 +index 0000000..5c55e17 +--- /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"); +-- +1.8.5.5 + |