From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Subject: [PATCH resend v2] input: Add new sun4i-lradc-keys driver Date: Wed, 17 Dec 2014 15:43:31 +0100 Message-ID: <1418827411-13265-2-git-send-email-hdegoede@redhat.com> References: <1418827411-13265-1-git-send-email-hdegoede@redhat.com> Reply-To: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <1418827411-13265-1-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Dmitry Torokhov Cc: Maxime Ripard , linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree , linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, Hans de Goede List-Id: linux-input@vger.kernel.org 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 -- 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-key= s.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..b9c32f6 --- /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 =C2=B5V at lradc input when this key is pressed. + +Example: + +#include + + lradc: lradc@01c22800 { + compatible =3D "allwinner,sun4i-a10-lradc-keys"; + reg =3D <0x01c22800 0x100>; + interrupts =3D <31>; + vref-supply =3D <®_vcc3v0>; + + button@191 { + label =3D "Volume Up"; + linux,code =3D ; + channel =3D <0>; + voltage =3D <191274>; + }; + + button@392 { + label =3D "Volume Down"; + linux,code =3D ; + channel =3D <0>; + voltage =3D <392644>; + }; + + button@601 { + label =3D "Menu"; + linux,code =3D ; + channel =3D <0>; + voltage =3D <601151>; + }; + + button@795 { + label =3D "Enter"; + linux,code =3D ; + channel =3D <0>; + voltage =3D <795090>; + }; + + button@987 { + label =3D "Home"; + linux,code =3D ; + channel =3D <0>; + voltage =3D <987387>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index fdffe96..fb3d33e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9193,6 +9193,13 @@ F: arch/m68k/sun3*/ F: arch/m68k/include/asm/sun3* F: drivers/net/ethernet/i825xx/sun3* =20 +SUN4I LOW RES ADC ATTACHED TABLET KEYS DRIVER +M: Hans de Goede +L: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.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 L: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfi= g index a3958c6..2d11b44 100644 --- 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. =20 +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/Makef= ile index 0a33456..a35269a 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_KEYBOARD_SPEAR) +=3D spear-keyboard.o obj-$(CONFIG_KEYBOARD_STMPE) +=3D stmpe-keypad.o obj-$(CONFIG_KEYBOARD_STOWAWAY) +=3D stowaway.o obj-$(CONFIG_KEYBOARD_ST_KEYSCAN) +=3D st-keyscan.o +obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) +=3D sun4i-lradc-keys.o obj-$(CONFIG_KEYBOARD_SUNKBD) +=3D sunkbd.o obj-$(CONFIG_KEYBOARD_TC3589X) +=3D tc3589x-keypad.o obj-$(CONFIG_KEYBOARD_TEGRA) +=3D tegra-kbc.o diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyb= oard/sun4i-lradc-keys.c new file mode 100644 index 0000000..f11f002 --- /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 + * + * 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 ha= ve + * various (tablet) keys (ie home, back, search, etc). attached to it usin= g + * a resistor network. This driver is for the keys on such boards. + * + * There are 2 channels, currently this driver only supports channel 0 sin= ce + * there are no boards known to use channel 1. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 =3D dev_id; + u32 i, ints, val, voltage, diff, keycode =3D 0, closest =3D 0xffffffff; + + ints =3D 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 =3D=3D 0) { + val =3D readl(lradc->base + LRADC_DATA0) & 0x3f; + voltage =3D val * lradc->vref / 63; + + for (i =3D 0; i < lradc->chan0_map_count; i++) { + diff =3D abs(lradc->chan0_map[i].voltage - voltage); + if (diff < closest) { + closest =3D diff; + keycode =3D lradc->chan0_map[i].keycode; + } + } + + lradc->chan0_keycode =3D 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 =3D 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 =3D input_get_drvdata(dev); + int ret; + + ret =3D regulator_enable(lradc->vref_supply); + if (ret) + return ret; + + /* lradc Vref internally is divided by 2/3 */ + lradc->vref =3D 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 =3D 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 =3D &pdev->dev; + struct device_node *pp, *np =3D dev->of_node; + u32 channel; + int i, ret; + + lradc =3D devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL); + if (!lradc) + return -ENOMEM; + + lradc->chan0_map_count =3D of_get_child_count(np); + lradc->chan0_map =3D devm_kmalloc(dev, lradc->chan0_map_count * + sizeof(struct sun4i_lradc_keymap), GFP_KERNEL); + if (!lradc->chan0_map) + return -ENOMEM; + + i =3D 0; + for_each_child_of_node(np, pp) { + struct sun4i_lradc_keymap *map =3D &lradc->chan0_map[i]; + + ret =3D of_property_read_u32(pp, "channel", &channel); + if (ret || channel !=3D 0) { + dev_err(dev, "%s: Inval channel prop\n", pp->name); + return -EINVAL; + } + + ret =3D of_property_read_u32(pp, "voltage", &map->voltage); + if (ret) { + dev_err(dev, "%s: Inval voltage prop\n", pp->name); + return -EINVAL; + } + + ret =3D 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 =3D devm_regulator_get(dev, "vref"); + if (IS_ERR(lradc->vref_supply)) + return PTR_ERR(lradc->vref_supply); + + lradc->dev =3D dev; + lradc->input =3D devm_input_allocate_device(dev); + if (!lradc->input) + return -ENOMEM; + + lradc->input->name =3D pdev->name; + lradc->input->phys =3D "sun4i_lradc/input0"; + lradc->input->open =3D sun4i_lradc_open; + lradc->input->close =3D sun4i_lradc_close; + lradc->input->id.bustype =3D BUS_HOST; + lradc->input->id.vendor =3D 0x0001; + lradc->input->id.product =3D 0x0001; + lradc->input->id.version =3D 0x0100; + lradc->input->evbit[0] =3D BIT(EV_SYN) | BIT(EV_KEY); + for (i =3D 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 =3D devm_ioremap_resource(dev, + platform_get_resource(pdev, IORESOURCE_MEM, 0)); + if (IS_ERR(lradc->base)) + return PTR_ERR(lradc->base); + + ret =3D devm_request_irq(dev, platform_get_irq(pdev, 0), sun4i_lradc_irq, + 0, "sun4i-a10-lradc-keys", lradc); + if (ret) + return ret; + + ret =3D 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[] =3D { + { .compatible =3D "allwinner,sun4i-a10-lradc-keys", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match); + +static struct platform_driver sun4i_lradc_driver =3D { + .driver =3D { + .name =3D "sun4i-a10-lradc-keys", + .of_match_table =3D of_match_ptr(sun4i_lradc_of_match), + }, + .probe =3D sun4i_lradc_probe, +}; + +module_platform_driver(sun4i_lradc_driver); + +MODULE_DESCRIPTION("Allwinner sun4i low res adc attached tablet keys drive= r"); +MODULE_AUTHOR("Hans de Goede "); +MODULE_LICENSE("GPL"); --=20 2.1.0 --=20 You received this message because you are subscribed to the Google Groups "= linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to linux-sunxi+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit https://groups.google.com/d/optout.