![Yong Zhang](/assets/img/avatar_default.png)
This flag is a NOOP and can be removed now. Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
621 lines
16 KiB
C
621 lines
16 KiB
C
/*
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* linux/drivers/input/keyboard/pxa27x_keypad.c
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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@fluxnic.net>.
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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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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/slab.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <mach/hardware.h>
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#include <plat/pxa27x_keypad.h>
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/*
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* Keypad Controller registers
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*/
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#define KPC 0x0000 /* Keypad Control register */
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#define KPDK 0x0008 /* Keypad Direct Key register */
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#define KPREC 0x0010 /* Keypad Rotary Encoder register */
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#define KPMK 0x0018 /* Keypad Matrix Key register */
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#define KPAS 0x0020 /* Keypad Automatic Scan register */
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/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
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#define KPASMKP0 0x0028
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#define KPASMKP1 0x0030
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#define KPASMKP2 0x0038
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#define KPASMKP3 0x0040
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#define KPKDI 0x0048
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/* bit definitions */
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#define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
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#define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
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#define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
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#define KPC_AS (0x1 << 30) /* Automatic Scan bit */
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#define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
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#define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
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#define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
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#define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
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#define KPC_MS_ALL (0xff << 13)
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#define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
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#define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
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#define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
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#define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
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#define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
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#define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
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#define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
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#define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
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#define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
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#define KPDK_DKP (0x1 << 31)
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#define KPDK_DK(n) ((n) & 0xff)
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#define KPREC_OF1 (0x1 << 31)
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#define kPREC_UF1 (0x1 << 30)
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#define KPREC_OF0 (0x1 << 15)
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#define KPREC_UF0 (0x1 << 14)
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#define KPREC_RECOUNT0(n) ((n) & 0xff)
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#define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
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#define KPMK_MKP (0x1 << 31)
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#define KPAS_SO (0x1 << 31)
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#define KPASMKPx_SO (0x1 << 31)
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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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#define KPASMKP_MKC_MASK (0xff)
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#define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
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#define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
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#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
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#define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
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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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void __iomem *mmio_base;
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int irq;
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unsigned short keycodes[MAX_KEYPAD_KEYS];
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int rotary_rel_code[2];
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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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uint32_t direct_key_state;
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unsigned int direct_key_mask;
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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 short keycode;
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int i;
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for (i = 0; i < pdata->matrix_key_map_size; i++) {
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unsigned int key = pdata->matrix_key_map[i];
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unsigned int row = KEY_ROW(key);
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unsigned int col = KEY_COL(key);
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unsigned int scancode = MATRIX_SCAN_CODE(row, col,
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MATRIX_ROW_SHIFT);
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keycode = KEY_VAL(key);
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keypad->keycodes[scancode] = keycode;
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__set_bit(keycode, input_dev->keybit);
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}
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for (i = 0; i < pdata->direct_key_num; i++) {
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keycode = pdata->direct_key_map[i];
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keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
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__set_bit(keycode, input_dev->keybit);
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}
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if (pdata->enable_rotary0) {
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if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
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keycode = pdata->rotary0_up_key;
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keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
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__set_bit(keycode, input_dev->keybit);
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keycode = pdata->rotary0_down_key;
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keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
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__set_bit(keycode, input_dev->keybit);
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keypad->rotary_rel_code[0] = -1;
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} else {
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keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
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__set_bit(pdata->rotary0_rel_code, input_dev->relbit);
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}
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}
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if (pdata->enable_rotary1) {
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if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
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keycode = pdata->rotary1_up_key;
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keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
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__set_bit(keycode, input_dev->keybit);
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keycode = pdata->rotary1_down_key;
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keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
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__set_bit(keycode, input_dev->keybit);
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keypad->rotary_rel_code[1] = -1;
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} else {
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keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
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__set_bit(pdata->rotary1_rel_code, input_dev->relbit);
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}
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}
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__clear_bit(KEY_RESERVED, input_dev->keybit);
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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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struct input_dev *input_dev = keypad->input_dev;
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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 = keypad_readl(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 = keypad_readl(KPASMKP0);
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uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
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uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
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uint32_t kpasmkp3 = keypad_readl(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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int code;
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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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code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, keypad->keycodes[code],
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new_state[col] & (1 << row));
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}
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}
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input_sync(input_dev);
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memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
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}
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#define DEFAULT_KPREC (0x007f007f)
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static inline int rotary_delta(uint32_t kprec)
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{
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if (kprec & KPREC_OF0)
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return (kprec & 0xff) + 0x7f;
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else if (kprec & KPREC_UF0)
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return (kprec & 0xff) - 0x7f - 0xff;
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else
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return (kprec & 0xff) - 0x7f;
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}
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static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
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{
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struct input_dev *dev = keypad->input_dev;
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if (delta == 0)
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return;
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if (keypad->rotary_rel_code[r] == -1) {
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int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
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unsigned char keycode = keypad->keycodes[code];
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/* simulate a press-n-release */
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input_event(dev, EV_MSC, MSC_SCAN, code);
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input_report_key(dev, keycode, 1);
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input_sync(dev);
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input_event(dev, EV_MSC, MSC_SCAN, code);
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input_report_key(dev, keycode, 0);
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input_sync(dev);
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} else {
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input_report_rel(dev, keypad->rotary_rel_code[r], delta);
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input_sync(dev);
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}
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}
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static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
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{
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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uint32_t kprec;
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/* read and reset to default count value */
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kprec = keypad_readl(KPREC);
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keypad_writel(KPREC, DEFAULT_KPREC);
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if (pdata->enable_rotary0)
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report_rotary_event(keypad, 0, rotary_delta(kprec));
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if (pdata->enable_rotary1)
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report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
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}
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static void pxa27x_keypad_scan_direct(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 new_state;
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uint32_t kpdk, bits_changed;
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int i;
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kpdk = keypad_readl(KPDK);
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if (pdata->enable_rotary0 || pdata->enable_rotary1)
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pxa27x_keypad_scan_rotary(keypad);
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new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
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bits_changed = keypad->direct_key_state ^ new_state;
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if (bits_changed == 0)
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return;
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for (i = 0; i < pdata->direct_key_num; i++) {
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if (bits_changed & (1 << i)) {
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int code = MAX_MATRIX_KEY_NUM + i;
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, keypad->keycodes[code],
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new_state & (1 << i));
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}
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}
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input_sync(input_dev);
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keypad->direct_key_state = new_state;
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}
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static void clear_wakeup_event(struct pxa27x_keypad *keypad)
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{
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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if (pdata->clear_wakeup_event)
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(pdata->clear_wakeup_event)();
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}
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static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
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{
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struct pxa27x_keypad *keypad = dev_id;
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unsigned long kpc = keypad_readl(KPC);
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clear_wakeup_event(keypad);
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if (kpc & KPC_DI)
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pxa27x_keypad_scan_direct(keypad);
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if (kpc & KPC_MI)
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pxa27x_keypad_scan_matrix(keypad);
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return IRQ_HANDLED;
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}
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static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
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{
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struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
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unsigned int mask = 0, direct_key_num = 0;
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unsigned long kpc = 0;
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/* enable matrix keys with automatic scan */
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if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
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kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
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kpc |= KPC_MKRN(pdata->matrix_key_rows) |
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KPC_MKCN(pdata->matrix_key_cols);
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}
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/* enable rotary key, debounce interval same as direct keys */
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if (pdata->enable_rotary0) {
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mask |= 0x03;
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direct_key_num = 2;
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kpc |= KPC_REE0;
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}
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if (pdata->enable_rotary1) {
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mask |= 0x0c;
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direct_key_num = 4;
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kpc |= KPC_REE1;
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}
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if (pdata->direct_key_num > direct_key_num)
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direct_key_num = pdata->direct_key_num;
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keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
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/* enable direct key */
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if (direct_key_num)
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kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
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keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
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keypad_writel(KPREC, DEFAULT_KPREC);
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keypad_writel(KPKDI, pdata->debounce_interval);
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}
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static int pxa27x_keypad_open(struct input_dev *dev)
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{
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struct pxa27x_keypad *keypad = input_get_drvdata(dev);
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/* Enable unit clock */
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clk_enable(keypad->clk);
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pxa27x_keypad_config(keypad);
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return 0;
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}
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static void pxa27x_keypad_close(struct input_dev *dev)
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{
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struct pxa27x_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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#ifdef CONFIG_PM
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static int pxa27x_keypad_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 pxa27x_keypad *keypad = platform_get_drvdata(pdev);
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clk_disable(keypad->clk);
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(keypad->irq);
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return 0;
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}
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static int pxa27x_keypad_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 pxa27x_keypad *keypad = platform_get_drvdata(pdev);
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struct input_dev *input_dev = keypad->input_dev;
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(keypad->irq);
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mutex_lock(&input_dev->mutex);
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if (input_dev->users) {
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/* Enable unit clock */
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clk_enable(keypad->clk);
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pxa27x_keypad_config(keypad);
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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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static const struct dev_pm_ops pxa27x_keypad_pm_ops = {
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.suspend = pxa27x_keypad_suspend,
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.resume = pxa27x_keypad_resume,
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};
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#endif
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|
|
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static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
|
|
{
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|
struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
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|
struct pxa27x_keypad *keypad;
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struct input_dev *input_dev;
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struct resource *res;
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int irq, error;
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|
|
|
if (pdata == NULL) {
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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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|
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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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|
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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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return -ENXIO;
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}
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keypad = kzalloc(sizeof(struct pxa27x_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 memory\n");
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error = -ENOMEM;
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goto failed_free;
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}
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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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|
|
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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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|
|
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keypad->mmio_base = ioremap(res->start, resource_size(res));
|
|
if (keypad->mmio_base == NULL) {
|
|
dev_err(&pdev->dev, "failed to remap I/O memory\n");
|
|
error = -ENXIO;
|
|
goto failed_free_mem;
|
|
}
|
|
|
|
keypad->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(keypad->clk)) {
|
|
dev_err(&pdev->dev, "failed to get keypad clock\n");
|
|
error = PTR_ERR(keypad->clk);
|
|
goto failed_free_io;
|
|
}
|
|
|
|
input_dev->name = pdev->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->keycode = keypad->keycodes;
|
|
input_dev->keycodesize = sizeof(keypad->keycodes[0]);
|
|
input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
|
|
|
|
input_set_drvdata(input_dev, keypad);
|
|
|
|
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
|
|
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
|
|
|
|
pxa27x_keypad_build_keycode(keypad);
|
|
|
|
if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
|
|
(pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
|
|
input_dev->evbit[0] |= BIT_MASK(EV_REL);
|
|
}
|
|
|
|
error = request_irq(irq, pxa27x_keypad_irq_handler, 0,
|
|
pdev->name, keypad);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to request IRQ\n");
|
|
goto failed_put_clk;
|
|
}
|
|
|
|
/* Register the input device */
|
|
error = input_register_device(input_dev);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to register input device\n");
|
|
goto failed_free_irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, keypad);
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
return 0;
|
|
|
|
failed_free_irq:
|
|
free_irq(irq, pdev);
|
|
failed_put_clk:
|
|
clk_put(keypad->clk);
|
|
failed_free_io:
|
|
iounmap(keypad->mmio_base);
|
|
failed_free_mem:
|
|
release_mem_region(res->start, resource_size(res));
|
|
failed_free:
|
|
input_free_device(input_dev);
|
|
kfree(keypad);
|
|
return error;
|
|
}
|
|
|
|
static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
|
|
{
|
|
struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct resource *res;
|
|
|
|
free_irq(keypad->irq, pdev);
|
|
clk_put(keypad->clk);
|
|
|
|
input_unregister_device(keypad->input_dev);
|
|
iounmap(keypad->mmio_base);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(keypad);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:pxa27x-keypad");
|
|
|
|
static struct platform_driver pxa27x_keypad_driver = {
|
|
.probe = pxa27x_keypad_probe,
|
|
.remove = __devexit_p(pxa27x_keypad_remove),
|
|
.driver = {
|
|
.name = "pxa27x-keypad",
|
|
.owner = THIS_MODULE,
|
|
#ifdef CONFIG_PM
|
|
.pm = &pxa27x_keypad_pm_ops,
|
|
#endif
|
|
},
|
|
};
|
|
|
|
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");
|