270 lines
6.5 KiB
C
270 lines
6.5 KiB
C
/*
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* Copyright (c) 2008-2009 Nuvoton technology corporation.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation;version 2 of the License.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/platform_data/keypad-w90p910.h>
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/* Keypad Interface Control Registers */
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#define KPI_CONF 0x00
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#define KPI_3KCONF 0x04
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#define KPI_LPCONF 0x08
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#define KPI_STATUS 0x0C
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#define IS1KEY (0x01 << 16)
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#define INTTR (0x01 << 21)
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#define KEY0R (0x0f << 3)
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#define KEY0C 0x07
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#define DEBOUNCE_BIT 0x08
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#define KSIZE0 (0x01 << 16)
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#define KSIZE1 (0x01 << 17)
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#define KPSEL (0x01 << 19)
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#define ENKP (0x01 << 18)
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#define KGET_RAW(n) (((n) & KEY0R) >> 3)
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#define KGET_COLUMN(n) ((n) & KEY0C)
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#define W90P910_NUM_ROWS 8
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#define W90P910_NUM_COLS 8
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#define W90P910_ROW_SHIFT 3
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struct w90p910_keypad {
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const struct w90p910_keypad_platform_data *pdata;
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struct clk *clk;
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struct input_dev *input_dev;
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void __iomem *mmio_base;
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int irq;
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unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
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};
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static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
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unsigned int status)
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{
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struct input_dev *input_dev = keypad->input_dev;
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unsigned int row = KGET_RAW(status);
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unsigned int col = KGET_COLUMN(status);
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unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
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unsigned int key = keypad->keymap[code];
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, key, 1);
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input_sync(input_dev);
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, key, 0);
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input_sync(input_dev);
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}
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static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
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{
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struct w90p910_keypad *keypad = dev_id;
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unsigned int kstatus, val;
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kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
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val = INTTR | IS1KEY;
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if (kstatus & val)
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w90p910_keypad_scan_matrix(keypad, kstatus);
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return IRQ_HANDLED;
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}
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static int w90p910_keypad_open(struct input_dev *dev)
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{
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struct w90p910_keypad *keypad = input_get_drvdata(dev);
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const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
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unsigned int val, config;
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/* Enable unit clock */
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clk_enable(keypad->clk);
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val = __raw_readl(keypad->mmio_base + KPI_CONF);
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val |= (KPSEL | ENKP);
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val &= ~(KSIZE0 | KSIZE1);
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config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
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val |= config;
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__raw_writel(val, keypad->mmio_base + KPI_CONF);
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return 0;
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}
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static void w90p910_keypad_close(struct input_dev *dev)
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{
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struct w90p910_keypad *keypad = input_get_drvdata(dev);
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/* Disable clock unit */
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clk_disable(keypad->clk);
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}
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static int w90p910_keypad_probe(struct platform_device *pdev)
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{
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const struct w90p910_keypad_platform_data *pdata =
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dev_get_platdata(&pdev->dev);
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const struct matrix_keymap_data *keymap_data;
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struct w90p910_keypad *keypad;
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struct input_dev *input_dev;
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struct resource *res;
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int irq;
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int error;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data defined\n");
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return -EINVAL;
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}
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keymap_data = pdata->keymap_data;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "failed to get keypad irq\n");
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return -ENXIO;
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}
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keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!keypad || !input_dev) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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error = -ENOMEM;
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goto failed_free;
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}
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keypad->pdata = pdata;
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keypad->input_dev = input_dev;
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keypad->irq = irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to get I/O memory\n");
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error = -ENXIO;
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goto failed_free;
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}
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res = request_mem_region(res->start, resource_size(res), pdev->name);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to request I/O memory\n");
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error = -EBUSY;
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goto failed_free;
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}
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keypad->mmio_base = ioremap(res->start, resource_size(res));
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if (keypad->mmio_base == NULL) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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error = -ENXIO;
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goto failed_free_res;
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}
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keypad->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(keypad->clk)) {
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dev_err(&pdev->dev, "failed to get keypad clock\n");
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error = PTR_ERR(keypad->clk);
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goto failed_free_io;
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}
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/* set multi-function pin for w90p910 kpi. */
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mfp_set_groupi(&pdev->dev);
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input_dev->name = pdev->name;
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input_dev->id.bustype = BUS_HOST;
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input_dev->open = w90p910_keypad_open;
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input_dev->close = w90p910_keypad_close;
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input_dev->dev.parent = &pdev->dev;
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error = matrix_keypad_build_keymap(keymap_data, NULL,
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W90P910_NUM_ROWS, W90P910_NUM_COLS,
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keypad->keymap, input_dev);
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if (error) {
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dev_err(&pdev->dev, "failed to build keymap\n");
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goto failed_put_clk;
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}
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error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
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0, pdev->name, keypad);
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if (error) {
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dev_err(&pdev->dev, "failed to request IRQ\n");
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goto failed_put_clk;
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}
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__set_bit(EV_REP, input_dev->evbit);
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(input_dev, keypad);
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/* Register the input device */
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error = input_register_device(input_dev);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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goto failed_free_irq;
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}
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platform_set_drvdata(pdev, keypad);
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return 0;
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failed_free_irq:
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free_irq(irq, keypad);
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failed_put_clk:
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clk_put(keypad->clk);
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failed_free_io:
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iounmap(keypad->mmio_base);
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failed_free_res:
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release_mem_region(res->start, resource_size(res));
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failed_free:
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input_free_device(input_dev);
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kfree(keypad);
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return error;
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}
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static int w90p910_keypad_remove(struct platform_device *pdev)
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{
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struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
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struct resource *res;
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free_irq(keypad->irq, keypad);
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clk_put(keypad->clk);
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input_unregister_device(keypad->input_dev);
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iounmap(keypad->mmio_base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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kfree(keypad);
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return 0;
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}
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static struct platform_driver w90p910_keypad_driver = {
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.probe = w90p910_keypad_probe,
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.remove = w90p910_keypad_remove,
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.driver = {
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.name = "nuc900-kpi",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(w90p910_keypad_driver);
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MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
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MODULE_DESCRIPTION("w90p910 keypad driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:nuc900-keypad");
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