[1/3] Input: DaVinci Key Scan Driver

Message ID	1253811202-21407-1-git-send-email-miguel.aguilar@ridgerun.com (mailing list archive)
State	New, archived
Headers	show Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n8OGrsYu016462 for <patchwork-linux-input@patchwork.kernel.org>; Thu, 24 Sep 2009 16:53:54 GMT From: miguel.aguilar@ridgerun.com To: nsnehaprabha@ti.com, davinci-linux-open-source@linux.davincidsp.com, linux-input@vger.kernel.org Cc: todd.fischer@ridgerun.com, diego.dompe@ridgerun.com, clark.becker@ridgerun.com, santiago.nunez@ridgerun.com, Miguel Aguilar <miguel.aguilar@ridgerun.com> Date: Thu, 24 Sep 2009 10:53:22 -0600 Message-Id: <1253811202-21407-1-git-send-email-miguel.aguilar@ridgerun.com> Subject: [PATCH 1/3] Input: DaVinci Key Scan Driver Sender: linux-input-owner@vger.kernel.org Precedence: bulk

diff --git a/arch/arm/mach-davinci/include/mach/keyscan.h b/arch/arm/mach-davinci/include/mach/keyscan.h new file mode 100644 index 0000000..6d64198 --- /dev/null +++ b/arch/arm/mach-davinci/include/mach/keyscan.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2009 Texas Instruments, Inc + * + * Author: Miguel Aguilar <miguel.aguilar@ridgerun.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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef DAVINCI_KEYSCAN_H +#define DAVINCI_KEYSCAN_H + +#include <linux/io.h> + +struct davinci_ks_platform_data { + unsigned short *keymap; + u32 keymapsize; + u32 rep:1; + u32 strobe; + u32 interval; +}; + +#endif + diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index a6b989a..72e560e 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -361,4 +361,14 @@ config KEYBOARD_XTKBD To compile this driver as a module, choose M here: the module will be called xtkbd. +config KEYBOARD_DAVINCI + tristate "TI DaVinci Key Scan" + depends on ARCH_DAVINCI_DM365 + help + Say Y to enable keypad module support for the TI DaVinci + platforms (DM365) + + To compile this driver as a module, choose M here: the + module will be called davinci_keyscan. + endif diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index b5b5eae..28e42b6 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o obj-$(CONFIG_KEYBOARD_TOSA) += tosakbd.o obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o +obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o diff --git a/drivers/input/keyboard/davinci_keyscan.c b/drivers/input/keyboard/davinci_keyscan.c new file mode 100644 index 0000000..074cf81 --- /dev/null +++ b/drivers/input/keyboard/davinci_keyscan.c @@ -0,0 +1,326 @@ +/* + * DaVinci Key Scan Driver for TI platforms + * + * Copyright (C) 2009 Texas Instruments, Inc + * + * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com> + * + * Intial Code: Sandeep Paulraj <s-paulraj@ti.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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/types.h> +#include <linux/input.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/errno.h> + +#include <asm/irq.h> + +#include <mach/hardware.h> +#include <mach/irqs.h> +#include <mach/keyscan.h> + +/* Key scan registers */ +#define DAVINCI_KEYSCAN_KEYCTRL 0x0000 +#define DAVINCI_KEYSCAN_INTENA 0x0004 +#define DAVINCI_KEYSCAN_INTFLAG 0x0008 +#define DAVINCI_KEYSCAN_INTCLR 0x000c +#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010 +#define DAVINCI_KEYSCAN_INTERVAL 0x0014 +#define DAVINCI_KEYSCAN_CONTTIME 0x0018 +#define DAVINCI_KEYSCAN_CURRENTST 0x001c +#define DAVINCI_KEYSCAN_PREVSTATE 0x0020 +#define DAVINCI_KEYSCAN_EMUCTRL 0x0024 +#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c + +/* Key Control Register (KEYCTRL) */ +#define DAVINCI_KEYSCAN_KEYEN 0x00000001 +#define DAVINCI_KEYSCAN_PREVMODE 0x00000002 +#define DAVINCI_KEYSCAN_CHATOFF 0x00000004 +#define DAVINCI_KEYSCAN_AUTODET 0x00000008 +#define DAVINCI_KEYSCAN_SCANMODE 0x00000010 +#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020 +#define DAVINCI_KEYSCAN_4X4 0x00000040 + +/* Masks for the interrupts */ +#define DAVINCI_KEYSCAN_INT_CONT 0x00000008 +#define DAVINCI_KEYSCAN_INT_OFF 0x00000004 +#define DAVINCI_KEYSCAN_INT_ON 0x00000002 +#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001 +#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f + +struct davinci_ks { + struct input_dev *input; + struct davinci_ks_platform_data *pdata; + int irq; + void __iomem *base; + resource_size_t pbase; + size_t base_size; + unsigned short keymap[]; +}; + +static void davinci_ks_write(struct davinci_ks *davinci_ks, u32 val, u32 addr) +{ + u32 base = (u32)davinci_ks->base; + + __raw_writel(val,(u32 *)(base + addr)); +} + +static u32 davinci_ks_read(struct davinci_ks *davinci_ks, u32 addr) +{ + u32 base = (u32)davinci_ks->base; + + return __raw_readl((u32 *)(base + addr)); +} + +/* Initializing the kp Module */ +static void davinci_ks_initialize(struct davinci_ks *davinci_ks) +{ + u32 strobe = davinci_ks->pdata->strobe; + u32 interval = davinci_ks->pdata->interval; + + /* Enable all interrupts */ + davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL, DAVINCI_KEYSCAN_INTENA); + + /* Clear interrupts if any */ + davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL, DAVINCI_KEYSCAN_INTCLR); + + /* Setup the scan period = strobe + interval */ + davinci_ks_write(davinci_ks, strobe, DAVINCI_KEYSCAN_STRBWIDTH); + davinci_ks_write(davinci_ks, interval, DAVINCI_KEYSCAN_INTERVAL); + davinci_ks_write(davinci_ks, 0x01, DAVINCI_KEYSCAN_CONTTIME); + + /* Enable Keyscan module and enable */ + davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN, + DAVINCI_KEYSCAN_KEYCTRL); +} + +static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id) +{ + struct davinci_ks *davinci_ks = dev_id; + struct device *dev = &davinci_ks->input->dev; + unsigned short *keymap = davinci_ks->keymap; + int keymapsize = davinci_ks->pdata->keymapsize; + u32 prev_status, new_status, changed; + bool release; + int keycode = KEY_UNKNOWN; + int i; + + /* Disable interrupt */ + davinci_ks_write(davinci_ks, 0x0, DAVINCI_KEYSCAN_INTENA); + + /* Reading previous and new status of the key scan */ + prev_status = davinci_ks_read(davinci_ks, DAVINCI_KEYSCAN_PREVSTATE); + new_status = davinci_ks_read(davinci_ks, DAVINCI_KEYSCAN_CURRENTST); + + changed = prev_status ^ new_status; + + if(changed) { + /* + * It goes go through all bits in changed to ensure + * that no key changes are being missed + */ + for(i = 0 ; i < keymapsize; i++) { + if((changed>>i) & 0x1) { + keycode = keymap[i]; + release = (new_status >> i) & 0x1; + dev_info(dev, "davinci_keyscan: key %d %s\n", + keycode, release ? "released" : "pressed"); + input_report_key(davinci_ks->input, keycode, + !release); + input_sync(davinci_ks->input); + } + } + /* Clearing interrupt */ + davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL, + DAVINCI_KEYSCAN_INTCLR); + } + + /* Enable interrupts */ + davinci_ks_write(davinci_ks, 0x1, DAVINCI_KEYSCAN_INTENA); + + return IRQ_HANDLED; +} + +static int __init davinci_ks_probe(struct platform_device *pdev) +{ + struct davinci_ks *davinci_ks; + struct input_dev *key_dev; + struct resource *res, *mem; + struct device * dev = &pdev->dev; + struct davinci_ks_platform_data *pdata = pdev->dev.platform_data; + int ret, i; + + dev_info(dev, "DaVinci Key Scan Driver\n"); + + davinci_ks = kzalloc(sizeof(struct davinci_ks) + + sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL); + if(!davinci_ks) { + dev_dbg(dev, "could not allocate memory for private data\n"); + return -ENOMEM; + } + + if (!pdata->keymap) { + dev_dbg(dev, "no keymap from pdata\n"); + return -EINVAL; + } + + memcpy(davinci_ks->keymap, pdata->keymap, + sizeof(unsigned short) * pdata->keymapsize); + + key_dev = input_allocate_device(); + if (!key_dev) { + dev_dbg(dev, "could not allocate input device\n"); + ret = -ENOMEM; + goto fail1; + } + + platform_set_drvdata(pdev, davinci_ks); + + davinci_ks->input = key_dev; + + davinci_ks->irq = platform_get_irq(pdev, 0); + if (davinci_ks->irq < 0) { + dev_err(dev, "no key scan irq\n"); + ret = davinci_ks->irq; + goto fail2; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "no mem resource\n"); + ret = -EINVAL; + goto fail2; + } + + davinci_ks->pbase = res->start; + davinci_ks->base_size = resource_size(res); + + mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size, pdev->name); + if (!mem) { + dev_err(dev, "key scan registers at %08x are not free\n", + davinci_ks->pbase); + ret = -EBUSY; + goto fail2; + } + + davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size); + if (!davinci_ks->base) { + dev_err(dev, "can't ioremap MEM resource.\n"); + ret = -ENOMEM; + goto fail3; + } + + /* Enable auto repeat feature of Linux input subsystem */ + if (pdata->rep) + __set_bit(EV_REP, key_dev->evbit); + + /* Setup input device */ + __set_bit(EV_KEY, key_dev->evbit); + + /* Setup the platform data */ + davinci_ks->pdata = pdata; + + for (i = 0; i < davinci_ks->pdata->keymapsize; i++) + __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit); + + key_dev->name = "davinci_keyscan"; + key_dev->phys = "davinci_keyscan/input0"; + key_dev->dev.parent = &pdev->dev; + key_dev->id.bustype = BUS_HOST; + key_dev->id.vendor = 0x0001; + key_dev->id.product = 0x0001; + key_dev->id.version = 0x0001; + key_dev->keycode = davinci_ks->keymap; + key_dev->keycodesize = sizeof(davinci_ks->keymap[0]); + key_dev->keycodemax = davinci_ks->pdata->keymapsize; + + ret = input_register_device(davinci_ks->input); + if (ret < 0) { + dev_err(dev, "unable to register DaVinci keyscan device\n"); + goto fail4; + } + + ret = request_irq(davinci_ks->irq, davinci_ks_interrupt, IRQF_DISABLED, + "davinci_keyscan", davinci_ks); + if (ret < 0) { + dev_err(dev, "unable to register DaVinci keyscan Interrupt\n"); + goto fail5; + } + + davinci_ks_initialize(davinci_ks); + + return 0; +fail5: + input_unregister_device(davinci_ks->input); + key_dev = NULL; +fail4: + iounmap(davinci_ks->base); +fail3: + release_mem_region(davinci_ks->pbase, davinci_ks->base_size); +fail2: + input_free_device(key_dev); +fail1: + kfree(davinci_ks); + + return ret; +} + +static int __devexit davinci_ks_remove(struct platform_device *pdev) +{ + struct davinci_ks *davinci_ks = platform_get_drvdata(pdev); + + free_irq(davinci_ks->irq, davinci_ks); + + input_unregister_device(davinci_ks->input); + + iounmap(davinci_ks->base); + release_mem_region(davinci_ks->pbase, davinci_ks->base_size); + + platform_set_drvdata(pdev, NULL); + + kfree(davinci_ks); + + return 0; +} + +static struct platform_driver davinci_ks_driver = { + .driver = { + .name = "davinci_keyscan", + .owner = THIS_MODULE, + }, + .remove = __devexit_p(davinci_ks_remove), +}; + +static int __init davinci_ks_init(void) +{ + return platform_driver_probe(&davinci_ks_driver, davinci_ks_probe); +} +module_init(davinci_ks_init); + +static void __exit davinci_ks_exit(void) +{ + platform_driver_unregister(&davinci_ks_driver); +} +module_exit(davinci_ks_exit); + +MODULE_AUTHOR("Miguel Aguilar"); +MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver"); +MODULE_LICENSE("GPL");

[1/3] Input: DaVinci Key Scan Driver

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