2007-03-16 04:58:52 +00:00
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/*
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2008-01-31 05:56:46 +00:00
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* linux/drivers/input/keyboard/pxa27x_keypad.c
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2007-03-16 04:58:52 +00:00
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*
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* Driver for the pxa27x matrix keyboard controller.
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*
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* Created: Feb 22, 2007
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* Author: Rodolfo Giometti <giometti@linux.it>
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*
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* Based on a previous implementations by Kevin O'Connor
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* <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
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* on some suggestions by Nicolas Pitre <nico@cam.org>.
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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 version 2 as
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* published by the Free Software Foundation.
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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/init.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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2007-08-20 09:19:39 +00:00
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#include <linux/clk.h>
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#include <linux/err.h>
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2007-03-16 04:58:52 +00:00
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/irqs.h>
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2008-01-31 05:56:46 +00:00
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#include <asm/arch/pxa27x_keypad.h>
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2007-03-16 04:58:52 +00:00
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2008-01-31 05:56:46 +00:00
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#define DRIVER_NAME "pxa27x-keypad"
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2007-03-16 04:58:52 +00:00
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2008-01-31 05:58:37 +00:00
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#define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
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#define KPAS_RP(n) (((n) >> 4) & 0xf)
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#define KPAS_CP(n) ((n) & 0xf)
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2007-03-16 04:58:52 +00:00
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2008-01-31 05:58:37 +00:00
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#define KPASMKP_MKC_MASK (0xff)
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#define MAX_MATRIX_KEY_NUM (8 * 8)
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struct pxa27x_keypad {
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struct pxa27x_keypad_platform_data *pdata;
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struct clk *clk;
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struct input_dev *input_dev;
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/* matrix key code map */
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unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
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/* state row bits of each column scan */
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uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
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};
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static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
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{
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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struct input_dev *input_dev = keypad->input_dev;
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unsigned int *key;
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int i;
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key = &pdata->matrix_key_map[0];
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for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
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int row = ((*key) >> 28) & 0xf;
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int col = ((*key) >> 24) & 0xf;
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int code = (*key) & 0xffffff;
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keypad->matrix_keycodes[(row << 3) + col] = code;
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set_bit(code, input_dev->keybit);
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}
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}
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static inline unsigned int lookup_matrix_keycode(
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struct pxa27x_keypad *keypad, int row, int col)
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{
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return keypad->matrix_keycodes[(row << 3) + col];
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}
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static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
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{
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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int row, col, num_keys_pressed = 0;
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uint32_t new_state[MAX_MATRIX_KEY_COLS];
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uint32_t kpas = KPAS;
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num_keys_pressed = KPAS_MUKP(kpas);
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memset(new_state, 0, sizeof(new_state));
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if (num_keys_pressed == 0)
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goto scan;
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if (num_keys_pressed == 1) {
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col = KPAS_CP(kpas);
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row = KPAS_RP(kpas);
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/* if invalid row/col, treat as no key pressed */
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if (col >= pdata->matrix_key_cols ||
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row >= pdata->matrix_key_rows)
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goto scan;
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new_state[col] = (1 << row);
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goto scan;
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}
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if (num_keys_pressed > 1) {
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uint32_t kpasmkp0 = KPASMKP0;
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uint32_t kpasmkp1 = KPASMKP1;
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uint32_t kpasmkp2 = KPASMKP2;
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uint32_t kpasmkp3 = KPASMKP3;
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new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
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new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
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new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
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new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
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new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
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new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
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new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
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new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
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}
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scan:
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for (col = 0; col < pdata->matrix_key_cols; col++) {
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uint32_t bits_changed;
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bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
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if (bits_changed == 0)
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continue;
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for (row = 0; row < pdata->matrix_key_rows; row++) {
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if ((bits_changed & (1 << row)) == 0)
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continue;
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input_report_key(keypad->input_dev,
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lookup_matrix_keycode(keypad, row, col),
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new_state[col] & (1 << row));
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}
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}
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input_sync(keypad->input_dev);
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memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
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}
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2007-08-20 09:19:39 +00:00
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2008-01-31 05:56:46 +00:00
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static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad = dev_id;
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struct input_dev *input_dev = keypad->input_dev;
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2007-03-16 04:58:52 +00:00
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unsigned long kpc = KPC;
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2008-01-31 05:58:37 +00:00
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int rel;
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2007-03-16 04:58:52 +00:00
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if (kpc & KPC_DI) {
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unsigned long kpdk = KPDK;
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if (!(kpdk & KPDK_DKP)) {
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/* better luck next time */
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} else if (kpc & KPC_REE0) {
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unsigned long kprec = KPREC;
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KPREC = 0x7f;
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if (kprec & KPREC_OF0)
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rel = (kprec & 0xff) + 0x7f;
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else if (kprec & KPREC_UF0)
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rel = (kprec & 0xff) - 0x7f - 0xff;
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else
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rel = (kprec & 0xff) - 0x7f;
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if (rel) {
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input_report_rel(input_dev, REL_WHEEL, rel);
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input_sync(input_dev);
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}
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}
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}
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2008-01-31 05:58:37 +00:00
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if (kpc & KPC_MI)
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pxa27x_keypad_scan_matrix(keypad);
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2007-03-16 04:58:52 +00:00
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return IRQ_HANDLED;
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}
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2008-01-31 05:56:46 +00:00
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static int pxa27x_keypad_open(struct input_dev *dev)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad = input_get_drvdata(dev);
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2007-03-16 04:58:52 +00:00
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/* Set keypad control register */
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KPC |= (KPC_ASACT |
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KPC_MS_ALL |
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(2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
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KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
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KPC &= ~KPC_AS; /* disable automatic scan */
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KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */
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/* Set rotary count to mid-point value */
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KPREC = 0x7F;
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/* Enable unit clock */
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2008-01-31 05:58:37 +00:00
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clk_enable(keypad->clk);
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2007-03-16 04:58:52 +00:00
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return 0;
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}
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2008-01-31 05:56:46 +00:00
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static void pxa27x_keypad_close(struct input_dev *dev)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad = input_get_drvdata(dev);
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2007-03-16 04:58:52 +00:00
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/* Disable clock unit */
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2008-01-31 05:58:37 +00:00
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clk_disable(keypad->clk);
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2007-03-16 04:58:52 +00:00
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}
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#ifdef CONFIG_PM
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2008-01-31 05:56:46 +00:00
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static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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2007-03-16 04:58:52 +00:00
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/* Save controller status */
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pdata->reg_kpc = KPC;
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pdata->reg_kprec = KPREC;
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return 0;
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}
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2008-01-31 05:56:46 +00:00
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static int pxa27x_keypad_resume(struct platform_device *pdev)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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struct input_dev *input_dev = keypad->input_dev;
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2007-03-16 04:58:52 +00:00
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mutex_lock(&input_dev->mutex);
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if (input_dev->users) {
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/* Restore controller status */
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KPC = pdata->reg_kpc;
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KPREC = pdata->reg_kprec;
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/* Enable unit clock */
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2008-01-31 05:58:37 +00:00
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clk_enable(keypad->clk);
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2007-03-16 04:58:52 +00:00
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}
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mutex_unlock(&input_dev->mutex);
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return 0;
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}
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#else
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2008-01-31 05:56:46 +00:00
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#define pxa27x_keypad_suspend NULL
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#define pxa27x_keypad_resume NULL
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2007-03-16 04:58:52 +00:00
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#endif
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2008-01-31 05:56:46 +00:00
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static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
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2007-03-16 04:58:52 +00:00
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{
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2008-01-31 05:58:37 +00:00
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struct pxa27x_keypad *keypad;
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2007-03-16 04:58:52 +00:00
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struct input_dev *input_dev;
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2008-01-31 05:58:37 +00:00
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int col, error;
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2007-03-16 04:58:52 +00:00
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2008-01-31 05:58:37 +00:00
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keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
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if (keypad == NULL) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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return -ENOMEM;
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}
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keypad->pdata = pdev->dev.platform_data;
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if (keypad->pdata == NULL) {
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dev_err(&pdev->dev, "no platform data defined\n");
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error = -EINVAL;
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goto failed_free;
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}
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keypad->clk = clk_get(&pdev->dev, "KBDCLK");
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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;
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2007-08-20 09:19:39 +00:00
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}
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2007-03-16 04:58:52 +00:00
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/* Create and register the input driver. */
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input_dev = input_allocate_device();
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if (!input_dev) {
|
2008-01-31 05:58:37 +00:00
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dev_err(&pdev->dev, "failed to allocate input device\n");
|
2007-08-20 09:19:39 +00:00
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error = -ENOMEM;
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2008-01-31 05:58:37 +00:00
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goto failed_put_clk;
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2007-03-16 04:58:52 +00:00
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}
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input_dev->name = DRIVER_NAME;
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input_dev->id.bustype = BUS_HOST;
|
2008-01-31 05:56:46 +00:00
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input_dev->open = pxa27x_keypad_open;
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input_dev->close = pxa27x_keypad_close;
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2007-04-12 05:34:58 +00:00
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input_dev->dev.parent = &pdev->dev;
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2007-03-16 04:58:52 +00:00
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2008-01-31 05:58:37 +00:00
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keypad->input_dev = input_dev;
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input_set_drvdata(input_dev, keypad);
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2007-10-19 06:40:32 +00:00
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
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BIT_MASK(EV_REL);
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input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL);
|
2008-01-31 05:58:37 +00:00
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pxa27x_keypad_build_keycode(keypad);
|
2007-03-16 04:58:52 +00:00
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|
2008-01-31 05:56:46 +00:00
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error = request_irq(IRQ_KEYPAD, pxa27x_keypad_irq_handler, IRQF_DISABLED,
|
2008-01-31 05:58:37 +00:00
|
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DRIVER_NAME, keypad);
|
2007-03-16 04:58:52 +00:00
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if (error) {
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printk(KERN_ERR "Cannot request keypad IRQ\n");
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goto err_free_dev;
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}
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|
2008-01-31 05:58:37 +00:00
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platform_set_drvdata(pdev, keypad);
|
2007-03-16 04:58:52 +00:00
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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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goto err_free_irq;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Store rows/cols info into keyboard registers.
|
|
|
|
*/
|
|
|
|
|
2008-01-31 05:58:37 +00:00
|
|
|
KPC |= (keypad->pdata->matrix_key_rows - 1) << 26;
|
|
|
|
KPC |= (keypad->pdata->matrix_key_cols - 1) << 23;
|
2007-03-16 04:58:52 +00:00
|
|
|
|
2008-01-31 05:58:37 +00:00
|
|
|
for (col = 0; col < keypad->pdata->matrix_key_cols; col++)
|
2007-03-16 04:58:52 +00:00
|
|
|
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);
|
2008-01-31 05:58:37 +00:00
|
|
|
failed_put_clk:
|
|
|
|
clk_put(keypad->clk);
|
|
|
|
failed_free:
|
|
|
|
kfree(keypad);
|
2007-03-16 04:58:52 +00:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
|
2007-03-16 04:58:52 +00:00
|
|
|
{
|
2008-01-31 05:58:37 +00:00
|
|
|
struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
|
2007-03-16 04:58:52 +00:00
|
|
|
|
|
|
|
free_irq(IRQ_KEYPAD, pdev);
|
|
|
|
|
2008-01-31 05:58:37 +00:00
|
|
|
clk_disable(keypad->clk);
|
|
|
|
clk_put(keypad->clk);
|
|
|
|
|
|
|
|
input_unregister_device(keypad->input_dev);
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
kfree(keypad);
|
2007-03-16 04:58:52 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
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,
|
2007-03-16 04:58:52 +00:00
|
|
|
.driver = {
|
|
|
|
.name = DRIVER_NAME,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
static int __init pxa27x_keypad_init(void)
|
2007-03-16 04:58:52 +00:00
|
|
|
{
|
2008-01-31 05:56:46 +00:00
|
|
|
return platform_driver_register(&pxa27x_keypad_driver);
|
2007-03-16 04:58:52 +00:00
|
|
|
}
|
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
static void __exit pxa27x_keypad_exit(void)
|
2007-03-16 04:58:52 +00:00
|
|
|
{
|
2008-01-31 05:56:46 +00:00
|
|
|
platform_driver_unregister(&pxa27x_keypad_driver);
|
2007-03-16 04:58:52 +00:00
|
|
|
}
|
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
module_init(pxa27x_keypad_init);
|
|
|
|
module_exit(pxa27x_keypad_exit);
|
2007-03-16 04:58:52 +00:00
|
|
|
|
2008-01-31 05:56:46 +00:00
|
|
|
MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
|
2007-03-16 04:58:52 +00:00
|
|
|
MODULE_LICENSE("GPL");
|