343 lines
8.9 KiB
C
343 lines
8.9 KiB
C
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/*
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* NXP LPC32xx SoC Key Scan Interface
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*
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* Authors:
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* Kevin Wells <kevin.wells@nxp.com>
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* Roland Stigge <stigge@antcom.de>
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*
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* Copyright (C) 2010 NXP Semiconductors
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* Copyright (C) 2012 Roland Stigge
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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* This controller supports square key matrices from 1x1 up to 8x8
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/pm.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/input/matrix_keypad.h>
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#define DRV_NAME "lpc32xx_keys"
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/*
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* Key scanner register offsets
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*/
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#define LPC32XX_KS_DEB(x) ((x) + 0x00)
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#define LPC32XX_KS_STATE_COND(x) ((x) + 0x04)
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#define LPC32XX_KS_IRQ(x) ((x) + 0x08)
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#define LPC32XX_KS_SCAN_CTL(x) ((x) + 0x0C)
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#define LPC32XX_KS_FAST_TST(x) ((x) + 0x10)
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#define LPC32XX_KS_MATRIX_DIM(x) ((x) + 0x14) /* 1..8 */
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#define LPC32XX_KS_DATA(x, y) ((x) + 0x40 + ((y) << 2))
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#define LPC32XX_KSCAN_DEB_NUM_DEB_PASS(n) ((n) & 0xFF)
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#define LPC32XX_KSCAN_SCOND_IN_IDLE 0x0
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#define LPC32XX_KSCAN_SCOND_IN_SCANONCE 0x1
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#define LPC32XX_KSCAN_SCOND_IN_IRQGEN 0x2
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#define LPC32XX_KSCAN_SCOND_IN_SCAN_MATRIX 0x3
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#define LPC32XX_KSCAN_IRQ_PENDING_CLR 0x1
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#define LPC32XX_KSCAN_SCTRL_SCAN_DELAY(n) ((n) & 0xFF)
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#define LPC32XX_KSCAN_FTST_FORCESCANONCE 0x1
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#define LPC32XX_KSCAN_FTST_USE32K_CLK 0x2
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#define LPC32XX_KSCAN_MSEL_SELECT(n) ((n) & 0xF)
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struct lpc32xx_kscan_drv {
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struct input_dev *input;
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struct clk *clk;
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void __iomem *kscan_base;
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unsigned int irq;
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u32 matrix_sz; /* Size of matrix in XxY, ie. 3 = 3x3 */
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u32 deb_clks; /* Debounce clocks (based on 32KHz clock) */
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u32 scan_delay; /* Scan delay (based on 32KHz clock) */
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unsigned short *keymap; /* Pointer to key map for the scan matrix */
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unsigned int row_shift;
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u8 lastkeystates[8];
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};
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static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
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{
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struct input_dev *input = kscandat->input;
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unsigned row, changed, scancode, keycode;
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u8 key;
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key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
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changed = key ^ kscandat->lastkeystates[col];
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kscandat->lastkeystates[col] = key;
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for (row = 0; changed; row++, changed >>= 1) {
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if (changed & 1) {
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/* Key state changed, signal an event */
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scancode = MATRIX_SCAN_CODE(row, col,
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kscandat->row_shift);
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keycode = kscandat->keymap[scancode];
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input_event(input, EV_MSC, MSC_SCAN, scancode);
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input_report_key(input, keycode, key & (1 << row));
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}
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}
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}
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static irqreturn_t lpc32xx_kscan_irq(int irq, void *dev_id)
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{
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struct lpc32xx_kscan_drv *kscandat = dev_id;
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int i;
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for (i = 0; i < kscandat->matrix_sz; i++)
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lpc32xx_mod_states(kscandat, i);
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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input_sync(kscandat->input);
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return IRQ_HANDLED;
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}
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static int lpc32xx_kscan_open(struct input_dev *dev)
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{
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struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
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int error;
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error = clk_prepare_enable(kscandat->clk);
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if (error)
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return error;
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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return 0;
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}
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static void lpc32xx_kscan_close(struct input_dev *dev)
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{
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struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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clk_disable_unprepare(kscandat->clk);
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}
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static int lpc32xx_parse_dt(struct device *dev,
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struct lpc32xx_kscan_drv *kscandat)
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{
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struct device_node *np = dev->of_node;
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u32 rows = 0, columns = 0;
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int err;
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err = matrix_keypad_parse_properties(dev, &rows, &columns);
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if (err)
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return err;
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if (rows != columns) {
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dev_err(dev, "rows and columns must be equal!\n");
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return -EINVAL;
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}
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kscandat->matrix_sz = rows;
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kscandat->row_shift = get_count_order(columns);
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of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);
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of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
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if (!kscandat->deb_clks || !kscandat->scan_delay) {
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dev_err(dev, "debounce or scan delay not specified\n");
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return -EINVAL;
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}
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return 0;
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}
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static int lpc32xx_kscan_probe(struct platform_device *pdev)
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{
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struct lpc32xx_kscan_drv *kscandat;
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struct input_dev *input;
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struct resource *res;
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size_t keymap_size;
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int error;
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int irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "failed to get platform I/O memory\n");
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return -EINVAL;
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}
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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 platform irq\n");
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return -EINVAL;
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}
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kscandat = devm_kzalloc(&pdev->dev, sizeof(*kscandat),
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GFP_KERNEL);
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if (!kscandat)
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return -ENOMEM;
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error = lpc32xx_parse_dt(&pdev->dev, kscandat);
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if (error) {
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dev_err(&pdev->dev, "failed to parse device tree\n");
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return error;
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}
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keymap_size = sizeof(kscandat->keymap[0]) *
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(kscandat->matrix_sz << kscandat->row_shift);
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kscandat->keymap = devm_kzalloc(&pdev->dev, keymap_size, GFP_KERNEL);
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if (!kscandat->keymap)
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return -ENOMEM;
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kscandat->input = input = devm_input_allocate_device(&pdev->dev);
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if (!input) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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/* Setup key input */
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input->name = pdev->name;
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input->phys = "lpc32xx/input0";
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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input->open = lpc32xx_kscan_open;
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input->close = lpc32xx_kscan_close;
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input->dev.parent = &pdev->dev;
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input_set_capability(input, EV_MSC, MSC_SCAN);
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error = matrix_keypad_build_keymap(NULL, NULL,
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kscandat->matrix_sz,
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kscandat->matrix_sz,
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kscandat->keymap, kscandat->input);
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if (error) {
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dev_err(&pdev->dev, "failed to build keymap\n");
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return error;
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}
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input_set_drvdata(kscandat->input, kscandat);
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kscandat->kscan_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(kscandat->kscan_base))
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return PTR_ERR(kscandat->kscan_base);
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/* Get the key scanner clock */
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kscandat->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(kscandat->clk)) {
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dev_err(&pdev->dev, "failed to get clock\n");
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return PTR_ERR(kscandat->clk);
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}
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/* Configure the key scanner */
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error = clk_prepare_enable(kscandat->clk);
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if (error)
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return error;
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writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));
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writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));
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writel(LPC32XX_KSCAN_FTST_USE32K_CLK,
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LPC32XX_KS_FAST_TST(kscandat->kscan_base));
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writel(kscandat->matrix_sz,
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LPC32XX_KS_MATRIX_DIM(kscandat->kscan_base));
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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clk_disable_unprepare(kscandat->clk);
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error = devm_request_irq(&pdev->dev, irq, lpc32xx_kscan_irq, 0,
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pdev->name, kscandat);
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if (error) {
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dev_err(&pdev->dev, "failed to request irq\n");
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return error;
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}
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error = input_register_device(kscandat->input);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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return error;
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}
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platform_set_drvdata(pdev, kscandat);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int lpc32xx_kscan_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
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struct input_dev *input = kscandat->input;
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mutex_lock(&input->mutex);
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if (input->users) {
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/* Clear IRQ and disable clock */
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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clk_disable_unprepare(kscandat->clk);
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}
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mutex_unlock(&input->mutex);
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return 0;
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}
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static int lpc32xx_kscan_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
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struct input_dev *input = kscandat->input;
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int retval = 0;
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mutex_lock(&input->mutex);
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if (input->users) {
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/* Enable clock and clear IRQ */
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retval = clk_prepare_enable(kscandat->clk);
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if (retval == 0)
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writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
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}
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mutex_unlock(&input->mutex);
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return retval;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(lpc32xx_kscan_pm_ops, lpc32xx_kscan_suspend,
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lpc32xx_kscan_resume);
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static const struct of_device_id lpc32xx_kscan_match[] = {
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{ .compatible = "nxp,lpc3220-key" },
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{},
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};
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MODULE_DEVICE_TABLE(of, lpc32xx_kscan_match);
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static struct platform_driver lpc32xx_kscan_driver = {
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.probe = lpc32xx_kscan_probe,
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.driver = {
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.name = DRV_NAME,
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.pm = &lpc32xx_kscan_pm_ops,
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.of_match_table = lpc32xx_kscan_match,
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}
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};
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module_platform_driver(lpc32xx_kscan_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
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MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
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MODULE_DESCRIPTION("Key scanner driver for LPC32XX devices");
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