input: Add STMPE keypad driver
Add an input driver for the keypad on STMPE I/O expanders. This driver uses the common support provided by the STMPE MFD driver. Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Rabin Vincent
Samuel Ortiz
Родитель
03f822f5e5
Коммит
76f1084531
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@ -395,6 +395,16 @@ config KEYBOARD_SH_KEYSC
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To compile this driver as a module, choose M here: the
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module will be called sh_keysc.
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config KEYBOARD_STMPE
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tristate "STMPE keypad support"
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depends on MFD_STMPE
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help
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Say Y here if you want to use the keypad controller on STMPE I/O
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expanders.
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To compile this driver as a module, choose M here: the module will be
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called stmpe-keypad.
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config KEYBOARD_DAVINCI
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tristate "TI DaVinci Key Scan"
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depends on ARCH_DAVINCI_DM365
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@ -35,6 +35,7 @@ obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
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obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
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obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
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obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
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obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o
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obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
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obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
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obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
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@ -0,0 +1,386 @@
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License, version 2
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/mfd/stmpe.h>
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/* These are at the same addresses in all STMPE variants */
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#define STMPE_KPC_COL 0x60
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#define STMPE_KPC_ROW_MSB 0x61
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#define STMPE_KPC_ROW_LSB 0x62
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#define STMPE_KPC_CTRL_MSB 0x63
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#define STMPE_KPC_CTRL_LSB 0x64
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#define STMPE_KPC_COMBI_KEY_0 0x65
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#define STMPE_KPC_COMBI_KEY_1 0x66
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#define STMPE_KPC_COMBI_KEY_2 0x67
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#define STMPE_KPC_DATA_BYTE0 0x68
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#define STMPE_KPC_DATA_BYTE1 0x69
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#define STMPE_KPC_DATA_BYTE2 0x6a
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#define STMPE_KPC_DATA_BYTE3 0x6b
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#define STMPE_KPC_DATA_BYTE4 0x6c
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#define STMPE_KPC_CTRL_LSB_SCAN (0x1 << 0)
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#define STMPE_KPC_CTRL_LSB_DEBOUNCE (0x7f << 1)
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#define STMPE_KPC_CTRL_MSB_SCAN_COUNT (0xf << 4)
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#define STMPE_KPC_ROW_MSB_ROWS 0xff
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#define STMPE_KPC_DATA_UP (0x1 << 7)
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#define STMPE_KPC_DATA_ROW (0xf << 3)
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#define STMPE_KPC_DATA_COL (0x7 << 0)
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#define STMPE_KPC_DATA_NOKEY_MASK 0x78
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#define STMPE_KEYPAD_MAX_DEBOUNCE 127
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#define STMPE_KEYPAD_MAX_SCAN_COUNT 15
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#define STMPE_KEYPAD_MAX_ROWS 8
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#define STMPE_KEYPAD_MAX_COLS 8
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#define STMPE_KEYPAD_ROW_SHIFT 3
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#define STMPE_KEYPAD_KEYMAP_SIZE \
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(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)
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/**
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* struct stmpe_keypad_variant - model-specific attributes
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* @auto_increment: whether the KPC_DATA_BYTE register address
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* auto-increments on multiple read
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* @num_data: number of data bytes
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* @num_normal_data: number of normal keys' data bytes
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* @max_cols: maximum number of columns supported
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* @max_rows: maximum number of rows supported
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* @col_gpios: bitmask of gpios which can be used for columns
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* @row_gpios: bitmask of gpios which can be used for rows
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*/
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struct stmpe_keypad_variant {
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bool auto_increment;
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int num_data;
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int num_normal_data;
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int max_cols;
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int max_rows;
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unsigned int col_gpios;
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unsigned int row_gpios;
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};
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static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
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[STMPE1601] = {
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.auto_increment = true,
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.num_data = 5,
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.num_normal_data = 3,
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.max_cols = 8,
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.max_rows = 8,
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.col_gpios = 0x000ff, /* GPIO 0 - 7 */
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.row_gpios = 0x0ff00, /* GPIO 8 - 15 */
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},
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[STMPE2401] = {
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.auto_increment = false,
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.num_data = 3,
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.num_normal_data = 2,
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.max_cols = 8,
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.max_rows = 12,
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.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
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.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
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},
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[STMPE2403] = {
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.auto_increment = true,
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.num_data = 5,
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.num_normal_data = 3,
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.max_cols = 8,
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.max_rows = 12,
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.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
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.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
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},
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};
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struct stmpe_keypad {
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struct stmpe *stmpe;
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struct input_dev *input;
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const struct stmpe_keypad_variant *variant;
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const struct stmpe_keypad_platform_data *plat;
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unsigned int rows;
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unsigned int cols;
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unsigned short keymap[STMPE_KEYPAD_KEYMAP_SIZE];
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};
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static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
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{
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const struct stmpe_keypad_variant *variant = keypad->variant;
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struct stmpe *stmpe = keypad->stmpe;
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int ret;
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int i;
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if (variant->auto_increment)
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return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
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variant->num_data, data);
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for (i = 0; i < variant->num_data; i++) {
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ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
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if (ret < 0)
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return ret;
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data[i] = ret;
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}
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return 0;
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}
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static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
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{
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struct stmpe_keypad *keypad = dev;
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struct input_dev *input = keypad->input;
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const struct stmpe_keypad_variant *variant = keypad->variant;
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u8 fifo[variant->num_data];
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int ret;
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int i;
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ret = stmpe_keypad_read_data(keypad, fifo);
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if (ret < 0)
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return IRQ_NONE;
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for (i = 0; i < variant->num_normal_data; i++) {
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u8 data = fifo[i];
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int row = (data & STMPE_KPC_DATA_ROW) >> 3;
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int col = data & STMPE_KPC_DATA_COL;
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int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
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bool up = data & STMPE_KPC_DATA_UP;
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if ((data & STMPE_KPC_DATA_NOKEY_MASK)
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== STMPE_KPC_DATA_NOKEY_MASK)
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continue;
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input_event(input, EV_MSC, MSC_SCAN, code);
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input_report_key(input, keypad->keymap[code], !up);
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input_sync(input);
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}
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return IRQ_HANDLED;
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}
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static int __devinit stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
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{
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const struct stmpe_keypad_variant *variant = keypad->variant;
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unsigned int col_gpios = variant->col_gpios;
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unsigned int row_gpios = variant->row_gpios;
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struct stmpe *stmpe = keypad->stmpe;
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unsigned int pins = 0;
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int i;
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/*
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* Figure out which pins need to be set to the keypad alternate
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* function.
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*
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* {cols,rows}_gpios are bitmasks of which pins on the chip can be used
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* for the keypad.
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*
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* keypad->{cols,rows} are a bitmask of which pins (of the ones useable
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* for the keypad) are used on the board.
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*/
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for (i = 0; i < variant->max_cols; i++) {
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int num = __ffs(col_gpios);
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if (keypad->cols & (1 << i))
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pins |= 1 << num;
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col_gpios &= ~(1 << num);
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}
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for (i = 0; i < variant->max_rows; i++) {
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int num = __ffs(row_gpios);
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if (keypad->rows & (1 << i))
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pins |= 1 << num;
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row_gpios &= ~(1 << num);
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}
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return stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
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}
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static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
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{
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const struct stmpe_keypad_platform_data *plat = keypad->plat;
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const struct stmpe_keypad_variant *variant = keypad->variant;
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struct stmpe *stmpe = keypad->stmpe;
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int ret;
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if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
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return -EINVAL;
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if (plat->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
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return -EINVAL;
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ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
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if (ret < 0)
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return ret;
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ret = stmpe_keypad_altfunc_init(keypad);
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if (ret < 0)
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return ret;
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ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
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if (ret < 0)
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return ret;
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ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
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if (ret < 0)
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return ret;
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if (variant->max_rows > 8) {
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ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
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STMPE_KPC_ROW_MSB_ROWS,
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keypad->rows >> 8);
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if (ret < 0)
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return ret;
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}
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ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
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STMPE_KPC_CTRL_MSB_SCAN_COUNT,
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plat->scan_count << 4);
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if (ret < 0)
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return ret;
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return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
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STMPE_KPC_CTRL_LSB_SCAN |
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STMPE_KPC_CTRL_LSB_DEBOUNCE,
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STMPE_KPC_CTRL_LSB_SCAN |
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(plat->debounce_ms << 1));
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}
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static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
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{
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struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
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struct stmpe_keypad_platform_data *plat;
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struct stmpe_keypad *keypad;
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struct input_dev *input;
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int ret;
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int irq;
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int i;
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plat = stmpe->pdata->keypad;
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if (!plat)
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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keypad = kzalloc(sizeof(struct stmpe_keypad), GFP_KERNEL);
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if (!keypad)
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return -ENOMEM;
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input = input_allocate_device();
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if (!input) {
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ret = -ENOMEM;
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goto out_freekeypad;
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}
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input->name = "STMPE keypad";
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input->id.bustype = BUS_I2C;
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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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__set_bit(EV_KEY, input->evbit);
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if (!plat->no_autorepeat)
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__set_bit(EV_REP, input->evbit);
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input->keycode = keypad->keymap;
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input->keycodesize = sizeof(keypad->keymap[0]);
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input->keycodemax = ARRAY_SIZE(keypad->keymap);
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matrix_keypad_build_keymap(plat->keymap_data, STMPE_KEYPAD_ROW_SHIFT,
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input->keycode, input->keybit);
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for (i = 0; i < plat->keymap_data->keymap_size; i++) {
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unsigned int key = plat->keymap_data->keymap[i];
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keypad->cols |= 1 << KEY_COL(key);
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keypad->rows |= 1 << KEY_ROW(key);
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}
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keypad->stmpe = stmpe;
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keypad->plat = plat;
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keypad->input = input;
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keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
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ret = stmpe_keypad_chip_init(keypad);
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if (ret < 0)
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goto out_freeinput;
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ret = input_register_device(input);
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if (ret) {
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dev_err(&pdev->dev,
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"unable to register input device: %d\n", ret);
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goto out_freeinput;
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}
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ret = request_threaded_irq(irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT,
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"stmpe-keypad", keypad);
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if (ret) {
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dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
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goto out_unregisterinput;
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}
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platform_set_drvdata(pdev, keypad);
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return 0;
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out_unregisterinput:
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input_unregister_device(input);
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input = NULL;
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out_freeinput:
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input_free_device(input);
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out_freekeypad:
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kfree(keypad);
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return ret;
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}
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static int __devexit stmpe_keypad_remove(struct platform_device *pdev)
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{
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struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
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struct stmpe *stmpe = keypad->stmpe;
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int irq = platform_get_irq(pdev, 0);
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stmpe_disable(stmpe, STMPE_BLOCK_KEYPAD);
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free_irq(irq, keypad);
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input_unregister_device(keypad->input);
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platform_set_drvdata(pdev, NULL);
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kfree(keypad);
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return 0;
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}
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static struct platform_driver stmpe_keypad_driver = {
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.driver.name = "stmpe-keypad",
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.driver.owner = THIS_MODULE,
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.probe = stmpe_keypad_probe,
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.remove = __devexit_p(stmpe_keypad_remove),
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};
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static int __init stmpe_keypad_init(void)
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{
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return platform_driver_register(&stmpe_keypad_driver);
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}
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module_init(stmpe_keypad_init);
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static void __exit stmpe_keypad_exit(void)
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{
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platform_driver_unregister(&stmpe_keypad_driver);
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}
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module_exit(stmpe_keypad_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("STMPExxxx keypad driver");
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MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
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