/* * linux/drivers/input/keyboard/pxa27x_keypad.c * * Driver for the pxa27x matrix keyboard controller. * * Created: Feb 22, 2007 * Author: Rodolfo Giometti * * Based on a previous implementations by Kevin O'Connor * and Alex Osborne and * on some suggestions by Nicolas Pitre . * * 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 #include #include #include #include #include #include #include #include #include #include #define DRIVER_NAME "pxa27x-keypad" #define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \ col/2 == 1 ? KPASMKP1 : \ col/2 == 2 ? KPASMKP2 : KPASMKP3) #define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2))) static struct clk *pxa27x_keypad_clk; static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id) { struct platform_device *pdev = dev_id; struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data; struct input_dev *input_dev = platform_get_drvdata(pdev); unsigned long kpc = KPC; int p, row, col, rel; if (kpc & KPC_DI) { unsigned long kpdk = KPDK; if (!(kpdk & KPDK_DKP)) { /* better luck next time */ } else if (kpc & KPC_REE0) { unsigned long kprec = KPREC; KPREC = 0x7f; if (kprec & KPREC_OF0) rel = (kprec & 0xff) + 0x7f; else if (kprec & KPREC_UF0) rel = (kprec & 0xff) - 0x7f - 0xff; else rel = (kprec & 0xff) - 0x7f; if (rel) { input_report_rel(input_dev, REL_WHEEL, rel); input_sync(input_dev); } } } if (kpc & KPC_MI) { /* report the status of every button */ for (row = 0; row < pdata->nr_rows; row++) { for (col = 0; col < pdata->nr_cols; col++) { p = KPASMKP(col) & KPASMKPx_MKC(row, col) ? 1 : 0; pr_debug("keycode %x - pressed %x\n", pdata->keycodes[row][col], p); input_report_key(input_dev, pdata->keycodes[row][col], p); } } input_sync(input_dev); } return IRQ_HANDLED; } static int pxa27x_keypad_open(struct input_dev *dev) { /* Set keypad control register */ KPC |= (KPC_ASACT | KPC_MS_ALL | (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL | KPC_ME | KPC_MIE | KPC_DE | KPC_DIE); KPC &= ~KPC_AS; /* disable automatic scan */ KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */ /* Set rotary count to mid-point value */ KPREC = 0x7F; /* Enable unit clock */ clk_enable(pxa27x_keypad_clk); return 0; } static void pxa27x_keypad_close(struct input_dev *dev) { /* Disable clock unit */ clk_disable(pxa27x_keypad_clk); } #ifdef CONFIG_PM static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state) { struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data; /* Save controller status */ pdata->reg_kpc = KPC; pdata->reg_kprec = KPREC; return 0; } static int pxa27x_keypad_resume(struct platform_device *pdev) { struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data; struct input_dev *input_dev = platform_get_drvdata(pdev); mutex_lock(&input_dev->mutex); if (input_dev->users) { /* Restore controller status */ KPC = pdata->reg_kpc; KPREC = pdata->reg_kprec; /* Enable unit clock */ clk_disable(pxa27x_keypad_clk); clk_enable(pxa27x_keypad_clk); } mutex_unlock(&input_dev->mutex); return 0; } #else #define pxa27x_keypad_suspend NULL #define pxa27x_keypad_resume NULL #endif static int __devinit pxa27x_keypad_probe(struct platform_device *pdev) { struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data; struct input_dev *input_dev; int i, row, col, error; pxa27x_keypad_clk = clk_get(&pdev->dev, "KBDCLK"); if (IS_ERR(pxa27x_keypad_clk)) { error = PTR_ERR(pxa27x_keypad_clk); goto err_clk; } /* Create and register the input driver. */ input_dev = input_allocate_device(); if (!input_dev) { printk(KERN_ERR "Cannot request keypad device\n"); error = -ENOMEM; goto err_alloc; } input_dev->name = DRIVER_NAME; input_dev->id.bustype = BUS_HOST; input_dev->open = pxa27x_keypad_open; input_dev->close = pxa27x_keypad_close; input_dev->dev.parent = &pdev->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL); input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL); for (row = 0; row < pdata->nr_rows; row++) { for (col = 0; col < pdata->nr_cols; col++) { int code = pdata->keycodes[row][col]; if (code > 0) set_bit(code, input_dev->keybit); } } error = request_irq(IRQ_KEYPAD, pxa27x_keypad_irq_handler, IRQF_DISABLED, DRIVER_NAME, pdev); if (error) { printk(KERN_ERR "Cannot request keypad IRQ\n"); goto err_free_dev; } platform_set_drvdata(pdev, input_dev); /* Register the input device */ error = input_register_device(input_dev); if (error) goto err_free_irq; /* * Store rows/cols info into keyboard registers. */ KPC |= (pdata->nr_rows - 1) << 26; KPC |= (pdata->nr_cols - 1) << 23; for (col = 0; col < pdata->nr_cols; col++) KPC |= KPC_MS0 << col; return 0; err_free_irq: platform_set_drvdata(pdev, NULL); free_irq(IRQ_KEYPAD, pdev); err_free_dev: input_free_device(input_dev); err_alloc: clk_put(pxa27x_keypad_clk); err_clk: return error; } static int __devexit pxa27x_keypad_remove(struct platform_device *pdev) { struct input_dev *input_dev = platform_get_drvdata(pdev); input_unregister_device(input_dev); free_irq(IRQ_KEYPAD, pdev); clk_put(pxa27x_keypad_clk); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver pxa27x_keypad_driver = { .probe = pxa27x_keypad_probe, .remove = __devexit_p(pxa27x_keypad_remove), .suspend = pxa27x_keypad_suspend, .resume = pxa27x_keypad_resume, .driver = { .name = DRIVER_NAME, }, }; static int __init pxa27x_keypad_init(void) { return platform_driver_register(&pxa27x_keypad_driver); } static void __exit pxa27x_keypad_exit(void) { platform_driver_unregister(&pxa27x_keypad_driver); } module_init(pxa27x_keypad_init); module_exit(pxa27x_keypad_exit); MODULE_DESCRIPTION("PXA27x Keypad Controller Driver"); MODULE_LICENSE("GPL");