/* * OMAP4 Keypad Driver * * Copyright (C) 2010 Texas Instruments * * Author: Abraham Arce <x0066660@ti.com> * Initial Code: Syed Rafiuddin <rafiuddin.syed@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/platform_device.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/input.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include <plat/omap4-keypad.h> /* OMAP4 registers */ #define OMAP4_KBD_REVISION 0x00 #define OMAP4_KBD_SYSCONFIG 0x10 #define OMAP4_KBD_SYSSTATUS 0x14 #define OMAP4_KBD_IRQSTATUS 0x18 #define OMAP4_KBD_IRQENABLE 0x1C #define OMAP4_KBD_WAKEUPENABLE 0x20 #define OMAP4_KBD_PENDING 0x24 #define OMAP4_KBD_CTRL 0x28 #define OMAP4_KBD_DEBOUNCINGTIME 0x2C #define OMAP4_KBD_LONGKEYTIME 0x30 #define OMAP4_KBD_TIMEOUT 0x34 #define OMAP4_KBD_STATEMACHINE 0x38 #define OMAP4_KBD_ROWINPUTS 0x3C #define OMAP4_KBD_COLUMNOUTPUTS 0x40 #define OMAP4_KBD_FULLCODE31_0 0x44 #define OMAP4_KBD_FULLCODE63_32 0x48 /* OMAP4 bit definitions */ #define OMAP4_DEF_IRQENABLE_EVENTEN (1 << 0) #define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1) #define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2) #define OMAP4_DEF_WUP_EVENT_ENA (1 << 0) #define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1) #define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1) #define OMAP4_DEF_CTRLPTVVALUE (1 << 2) #define OMAP4_DEF_CTRLPTV (1 << 1) /* OMAP4 values */ #define OMAP4_VAL_IRQDISABLE 0x00 #define OMAP4_VAL_DEBOUNCINGTIME 0x07 #define OMAP4_VAL_FUNCTIONALCFG 0x1E #define OMAP4_MASK_IRQSTATUSDISABLE 0xFFFF struct omap4_keypad { struct input_dev *input; void __iomem *base; int irq; unsigned int rows; unsigned int cols; unsigned int row_shift; unsigned char key_state[8]; unsigned short keymap[]; }; /* Interrupt handler */ static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id) { struct omap4_keypad *keypad_data = dev_id; struct input_dev *input_dev = keypad_data->input; unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)]; unsigned int col, row, code, changed; u32 *new_state = (u32 *) key_state; /* Disable interrupts */ __raw_writel(OMAP4_VAL_IRQDISABLE, keypad_data->base + OMAP4_KBD_IRQENABLE); *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0); *(new_state + 1) = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE63_32); for (row = 0; row < keypad_data->rows; row++) { changed = key_state[row] ^ keypad_data->key_state[row]; if (!changed) continue; for (col = 0; col < keypad_data->cols; col++) { if (changed & (1 << col)) { code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift); input_event(input_dev, EV_MSC, MSC_SCAN, code); input_report_key(input_dev, keypad_data->keymap[code], key_state[row] & (1 << col)); } } } input_sync(input_dev); memcpy(keypad_data->key_state, key_state, sizeof(keypad_data->key_state)); /* clear pending interrupts */ __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS), keypad_data->base + OMAP4_KBD_IRQSTATUS); /* enable interrupts */ __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY, keypad_data->base + OMAP4_KBD_IRQENABLE); return IRQ_HANDLED; } static int omap4_keypad_open(struct input_dev *input) { struct omap4_keypad *keypad_data = input_get_drvdata(input); pm_runtime_get_sync(input->dev.parent); disable_irq(keypad_data->irq); __raw_writel(OMAP4_VAL_FUNCTIONALCFG, keypad_data->base + OMAP4_KBD_CTRL); __raw_writel(OMAP4_VAL_DEBOUNCINGTIME, keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME); __raw_writel(OMAP4_VAL_IRQDISABLE, keypad_data->base + OMAP4_KBD_IRQSTATUS); __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY, keypad_data->base + OMAP4_KBD_IRQENABLE); __raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA, keypad_data->base + OMAP4_KBD_WAKEUPENABLE); enable_irq(keypad_data->irq); return 0; } static void omap4_keypad_close(struct input_dev *input) { struct omap4_keypad *keypad_data = input_get_drvdata(input); disable_irq(keypad_data->irq); /* Disable interrupts */ __raw_writel(OMAP4_VAL_IRQDISABLE, keypad_data->base + OMAP4_KBD_IRQENABLE); /* clear pending interrupts */ __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS), keypad_data->base + OMAP4_KBD_IRQSTATUS); enable_irq(keypad_data->irq); pm_runtime_put_sync(input->dev.parent); } static int __devinit omap4_keypad_probe(struct platform_device *pdev) { const struct omap4_keypad_platform_data *pdata; struct omap4_keypad *keypad_data; struct input_dev *input_dev; struct resource *res; resource_size_t size; unsigned int row_shift, max_keys; int irq; int error; /* platform data */ pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev, "no platform data defined\n"); return -EINVAL; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "no base address specified\n"); return -EINVAL; } irq = platform_get_irq(pdev, 0); if (!irq) { dev_err(&pdev->dev, "no keyboard irq assigned\n"); return -EINVAL; } if (!pdata->keymap_data) { dev_err(&pdev->dev, "no keymap data defined\n"); return -EINVAL; } row_shift = get_count_order(pdata->cols); max_keys = pdata->rows << row_shift; keypad_data = kzalloc(sizeof(struct omap4_keypad) + max_keys * sizeof(keypad_data->keymap[0]), GFP_KERNEL); if (!keypad_data) { dev_err(&pdev->dev, "keypad_data memory allocation failed\n"); return -ENOMEM; } size = resource_size(res); res = request_mem_region(res->start, size, pdev->name); if (!res) { dev_err(&pdev->dev, "can't request mem region\n"); error = -EBUSY; goto err_free_keypad; } keypad_data->base = ioremap(res->start, resource_size(res)); if (!keypad_data->base) { dev_err(&pdev->dev, "can't ioremap mem resource\n"); error = -ENOMEM; goto err_release_mem; } keypad_data->irq = irq; keypad_data->row_shift = row_shift; keypad_data->rows = pdata->rows; keypad_data->cols = pdata->cols; /* input device allocation */ keypad_data->input = input_dev = input_allocate_device(); if (!input_dev) { error = -ENOMEM; goto err_unmap; } input_dev->name = pdev->name; input_dev->dev.parent = &pdev->dev; input_dev->id.bustype = BUS_HOST; input_dev->id.vendor = 0x0001; input_dev->id.product = 0x0001; input_dev->id.version = 0x0001; input_dev->open = omap4_keypad_open; input_dev->close = omap4_keypad_close; input_dev->keycode = keypad_data->keymap; input_dev->keycodesize = sizeof(keypad_data->keymap[0]); input_dev->keycodemax = max_keys; __set_bit(EV_KEY, input_dev->evbit); __set_bit(EV_REP, input_dev->evbit); input_set_capability(input_dev, EV_MSC, MSC_SCAN); input_set_drvdata(input_dev, keypad_data); matrix_keypad_build_keymap(pdata->keymap_data, row_shift, input_dev->keycode, input_dev->keybit); error = request_irq(keypad_data->irq, omap4_keypad_interrupt, IRQF_TRIGGER_RISING, "omap4-keypad", keypad_data); if (error) { dev_err(&pdev->dev, "failed to register interrupt\n"); goto err_free_input; } pm_runtime_enable(&pdev->dev); error = input_register_device(keypad_data->input); if (error < 0) { dev_err(&pdev->dev, "failed to register input device\n"); goto err_pm_disable; } platform_set_drvdata(pdev, keypad_data); return 0; err_pm_disable: pm_runtime_disable(&pdev->dev); free_irq(keypad_data->irq, keypad_data); err_free_input: input_free_device(input_dev); err_unmap: iounmap(keypad_data->base); err_release_mem: release_mem_region(res->start, size); err_free_keypad: kfree(keypad_data); return error; } static int __devexit omap4_keypad_remove(struct platform_device *pdev) { struct omap4_keypad *keypad_data = platform_get_drvdata(pdev); struct resource *res; free_irq(keypad_data->irq, keypad_data); pm_runtime_disable(&pdev->dev); input_unregister_device(keypad_data->input); iounmap(keypad_data->base); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(res->start, resource_size(res)); kfree(keypad_data); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver omap4_keypad_driver = { .probe = omap4_keypad_probe, .remove = __devexit_p(omap4_keypad_remove), .driver = { .name = "omap4-keypad", .owner = THIS_MODULE, }, }; module_platform_driver(omap4_keypad_driver); MODULE_AUTHOR("Texas Instruments"); MODULE_DESCRIPTION("OMAP4 Keypad Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:omap4-keypad");