From patchwork Tue Mar 18 15:00:02 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Fernandez X-Patchwork-Id: 331452 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 188522C009F for ; Wed, 19 Mar 2014 02:02:56 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932296AbaCRPCd (ORCPT ); Tue, 18 Mar 2014 11:02:33 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:33793 "EHLO mx08-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932070AbaCRPCb (ORCPT ); Tue, 18 Mar 2014 11:02:31 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.14.5/8.14.5) with SMTP id s2IEufNP016046; Tue, 18 Mar 2014 16:01:36 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 1jkm91jyac-1 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NOT); Tue, 18 Mar 2014 16:01:36 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 499B059; Tue, 18 Mar 2014 15:01:08 +0000 (GMT) Received: from mail7.sgp.st.com (unknown [164.129.223.81]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C90442C72F; Tue, 18 Mar 2014 15:01:07 +0000 (GMT) Received: from lmenx315.lme.st.com ([10.201.19.41]) by mail7.sgp.st.com (MOS 4.3.3-GA) with ESMTP id BYX59897 (AUTH frq07381); Tue, 18 Mar 2014 16:00:42 +0100 From: Gabriel FERNANDEZ To: Dmitry Torokhov , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Rob Landley , Russell King , Grant Likely Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, kernel@stlinux.com, Lee Jones , Gabriel Fernandez , Giuseppe Condorelli Subject: [PATCH v2 1/5] drivers: input: keyboard: st-keyscan: add keyscan driver Date: Tue, 18 Mar 2014 16:00:02 +0100 Message-Id: <1395154806-2810-2-git-send-email-gabriel.fernandez@st.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1395154806-2810-1-git-send-email-gabriel.fernandez@st.com> References: <1395154806-2810-1-git-send-email-gabriel.fernandez@st.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.87, 1.0.14, 0.0.0000 definitions=2014-03-18_05:2014-03-18, 2014-03-18, 1970-01-01 signatures=0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds ST Keyscan driver to use the keypad hw a subset of ST boards provide. Specific board setup will be put in the given dt. Signed-off-by: Gabriel Fernandez Signed-off-by: Giuseppe Condorelli --- .../devicetree/bindings/input/st-keyscan.txt | 60 +++++ drivers/input/keyboard/Kconfig | 12 + drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/st-keyscan.c | 260 +++++++++++++++++++++ 4 files changed, 333 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/st-keyscan.txt create mode 100644 drivers/input/keyboard/st-keyscan.c diff --git a/Documentation/devicetree/bindings/input/st-keyscan.txt b/Documentation/devicetree/bindings/input/st-keyscan.txt new file mode 100644 index 0000000..51eb428 --- /dev/null +++ b/Documentation/devicetree/bindings/input/st-keyscan.txt @@ -0,0 +1,60 @@ +* ST Keyscan controller Device Tree bindings + +The ST keyscan controller Device Tree binding is based on the +matrix-keymap. + +Required properties: +- compatible: "st,sti-keyscan" + +- reg: Register base address and size of st-keyscan controller. + +- interrupts: Interrupt number for the st-keyscan controller. + +- clocks: Must contain one entry, for the module clock. + See ../clocks/clock-bindings.txt for details. + +- pinctrl: Should specify pin control groups used for this controller. + See ../pinctrl/pinctrl-bindings.txt for details. + +- linux,keymap: The keymap for keys as described in the binding document + devicetree/bindings/input/matrix-keymap.txt. + +- keypad,num-rows: Number of row lines connected to the keypad controller. + +- keypad,num-columns: Number of column lines connected to the keypad + controller. + +Optional property: +- st,debounce_us: Debouncing interval time in microseconds + +Example: + +keyscan: keyscan@fe4b0000 { + compatible = "st,sti-keyscan"; + reg = <0xfe4b0000 0x2000>; + interrupts = ; + clocks = <&CLK_SYSIN>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_keyscan>; + + keypad,num-rows = <4>; + keypad,num-columns = <4>; + st,debounce_us = <5000>; + + linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_F13) + MATRIX_KEY(0x00, 0x01, KEY_F9) + MATRIX_KEY(0x00, 0x02, KEY_F5) + MATRIX_KEY(0x00, 0x03, KEY_F1) + MATRIX_KEY(0x01, 0x00, KEY_F14) + MATRIX_KEY(0x01, 0x01, KEY_F10) + MATRIX_KEY(0x01, 0x02, KEY_F6) + MATRIX_KEY(0x01, 0x03, KEY_F2) + MATRIX_KEY(0x02, 0x00, KEY_F15) + MATRIX_KEY(0x02, 0x01, KEY_F11) + MATRIX_KEY(0x02, 0x02, KEY_F7) + MATRIX_KEY(0x02, 0x03, KEY_F3) + MATRIX_KEY(0x03, 0x00, KEY_F16) + MATRIX_KEY(0x03, 0x01, KEY_F12) + MATRIX_KEY(0x03, 0x02, KEY_F8) + MATRIX_KEY(0x03, 0x03, KEY_F4) >; + }; diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index a673c9f..06b2c76 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -512,6 +512,18 @@ config KEYBOARD_STOWAWAY To compile this driver as a module, choose M here: the module will be called stowaway. +config KEYBOARD_ST_KEYSCAN + tristate "STMicroelectronics keyscan support" + depends on ARCH_STI + select INPUT_EVDEV + select INPUT_MATRIXKMAP + help + Say Y here if you want to use a keypad attached to the keyscan block + on some STMicroelectronics SoC devices. + + To compile this driver as a module, choose M here: the + module will be called st-keyscan. + config KEYBOARD_SUNKBD tristate "Sun Type 4 and Type 5 keyboard" select SERIO diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index a699b61..5fd020a 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-$(CONFIG_KEYBOARD_ST_KEYSCAN) += st-keyscan.o obj-$(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/st-keyscan.c b/drivers/input/keyboard/st-keyscan.c new file mode 100644 index 0000000..65cb3ac --- /dev/null +++ b/drivers/input/keyboard/st-keyscan.c @@ -0,0 +1,260 @@ +/* + * STMicroelectronics Key Scanning driver + * + * Copyright (c) 2014 STMicroelectonics Ltd. + * Author: Stuart Menefy + * + * Based on sh_keysc.c, copyright 2008 Magnus Damm + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include + +#define ST_KEYSCAN_MAXKEYS 16 + +#define KEYSCAN_CONFIG_OFF 0x0 +#define KEYSCAN_CONFIG_ENABLE 0x1 +#define KEYSCAN_DEBOUNCE_TIME_OFF 0x4 +#define KEYSCAN_MATRIX_STATE_OFF 0x8 +#define KEYSCAN_MATRIX_DIM_OFF 0xc +#define KEYSCAN_MATRIX_DIM_X_SHIFT 0x0 +#define KEYSCAN_MATRIX_DIM_Y_SHIFT 0x2 + +struct st_keyscan { + void __iomem *base; + int irq; + struct clk *clk; + struct input_dev *input_dev; + unsigned int last_state; + unsigned int n_rows; + unsigned int n_cols; + unsigned int debounce_us; +}; + +static irqreturn_t keyscan_isr(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct st_keyscan *keypad = platform_get_drvdata(pdev); + unsigned short *keycode = keypad->input_dev->keycode; + int state; + int change; + + state = readl(keypad->base + KEYSCAN_MATRIX_STATE_OFF) & 0xffff; + change = keypad->last_state ^ state; + + while (change) { + int scancode = __ffs(change); + int down = state & BIT(scancode); + + input_report_key(keypad->input_dev, keycode[scancode], down); + + change ^= BIT(scancode); + }; + input_sync(keypad->input_dev); + + keypad->last_state = state; + + return IRQ_HANDLED; +} + +static int keyscan_start(struct st_keyscan *keypad) +{ + clk_enable(keypad->clk); + + writel(keypad->debounce_us * (clk_get_rate(keypad->clk) / 1000000), + keypad->base + KEYSCAN_DEBOUNCE_TIME_OFF); + + writel(((keypad->n_cols - 1) << KEYSCAN_MATRIX_DIM_X_SHIFT) | + ((keypad->n_rows - 1) << KEYSCAN_MATRIX_DIM_Y_SHIFT), + keypad->base + KEYSCAN_MATRIX_DIM_OFF); + + writel(KEYSCAN_CONFIG_ENABLE, keypad->base + KEYSCAN_CONFIG_OFF); + + return 0; +} + +static void keyscan_stop(struct st_keyscan *keypad) +{ + writel(0, keypad->base + KEYSCAN_CONFIG_OFF); + + clk_disable(keypad->clk); +} + +static int keyscan_open(struct input_dev *dev) +{ + struct st_keyscan *keypad = input_get_drvdata(dev); + + return keyscan_start(keypad); +} + +static void keyscan_close(struct input_dev *dev) +{ + struct st_keyscan *keypad = input_get_drvdata(dev); + + keyscan_stop(keypad); +} + +static int keypad_matrix_key_parse_dt(struct st_keyscan *keypad_data) +{ + struct device *dev = keypad_data->input_dev->dev.parent; + struct device_node *np = dev->of_node; + int error; + + error = matrix_keypad_parse_of_params(dev, &keypad_data->n_rows, + &keypad_data->n_cols); + if (error) { + dev_err(dev, "failed to parse keypad params\n"); + return error; + } + + of_property_read_u32(np, "st,debounce_us", &keypad_data->debounce_us); + + dev_info(dev, "n_rows=%d n_col=%d debounce=%d\n", + keypad_data->n_rows, + keypad_data->n_cols, + keypad_data->debounce_us); + + return 0; +} + +static int __init keyscan_probe(struct platform_device *pdev) +{ + struct st_keyscan *keypad_data; + struct input_dev *input_dev; + struct resource *res; + int error; + + if (!pdev->dev.of_node) { + dev_err(&pdev->dev, "no keymap defined\n"); + return -EINVAL; + } + + keypad_data = devm_kzalloc(&pdev->dev, + sizeof(*keypad_data), GFP_KERNEL); + if (!keypad_data) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + keypad_data->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(keypad_data->base)) + return PTR_ERR(keypad_data->base); + + keypad_data->irq = platform_get_irq(pdev, 0); + if (keypad_data->irq < 0) { + dev_err(&pdev->dev, "no IRQ specified\n"); + return -EINVAL; + } + + error = devm_request_irq(&pdev->dev, keypad_data->irq, keyscan_isr, 0, + pdev->name, pdev); + if (error) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return error; + } + + input_dev = devm_input_allocate_device(&pdev->dev); + + if (!input_dev) { + dev_err(&pdev->dev, "failed to allocate the input device\n"); + return -ENOMEM; + } + + keypad_data->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(keypad_data->clk)) { + dev_err(&pdev->dev, "cannot get clock"); + return PTR_ERR(keypad_data->clk); + } + + keypad_data->input_dev = input_dev; + + input_dev->name = pdev->name; + input_dev->phys = "keyscan-keys/input0"; + input_dev->dev.parent = &pdev->dev; + input_dev->open = keyscan_open; + input_dev->close = keyscan_close; + + input_dev->id.bustype = BUS_HOST; + + error = keypad_matrix_key_parse_dt(keypad_data); + if (error) + return error; + + error = matrix_keypad_build_keymap(NULL, NULL, + keypad_data->n_rows, keypad_data->n_cols, + NULL, input_dev); + if (error) { + dev_err(&pdev->dev, "failed to build keymap\n"); + return error; + } + + input_set_drvdata(input_dev, keypad_data); + + error = input_register_device(input_dev); + if (error) { + dev_err(&pdev->dev, "failed to register input device\n"); + return error; + } + + platform_set_drvdata(pdev, keypad_data); + + device_set_wakeup_capable(&pdev->dev, 1); + + return 0; +} + +static int keyscan_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct st_keyscan *keypad = platform_get_drvdata(pdev); + + if (device_may_wakeup(dev)) + enable_irq_wake(keypad->irq); + else + keyscan_stop(keypad); + + return 0; +} + +static int keyscan_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct st_keyscan *keypad = platform_get_drvdata(pdev); + + if (device_may_wakeup(dev)) + disable_irq_wake(keypad->irq); + else + keyscan_start(keypad); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops, keyscan_suspend, keyscan_resume); + +static const struct of_device_id keyscan_of_match[] = { + { .compatible = "st,sti-keyscan" }, + { }, +}; +MODULE_DEVICE_TABLE(of, keyscan_of_match); + +struct platform_driver keyscan_device_driver = { + .probe = keyscan_probe, + .driver = { + .name = "st-keyscan", + .pm = &keyscan_dev_pm_ops, + .of_match_table = of_match_ptr(keyscan_of_match), + } +}; + +module_platform_driver(keyscan_device_driver); + +MODULE_AUTHOR("Stuart Menefy "); +MODULE_DESCRIPTION("STMicroelectronics keyscan device driver"); +MODULE_LICENSE("GPL");