- 根目录:
- drivers
- input
- keyboard
- stmpe-keypad.c
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License, version 2
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/input/matrix_keypad.h>
#include <linux/mfd/stmpe.h>
/* These are at the same addresses in all STMPE variants */
#define STMPE_KPC_COL 0x60
#define STMPE_KPC_ROW_MSB 0x61
#define STMPE_KPC_ROW_LSB 0x62
#define STMPE_KPC_CTRL_MSB 0x63
#define STMPE_KPC_CTRL_LSB 0x64
#define STMPE_KPC_COMBI_KEY_0 0x65
#define STMPE_KPC_COMBI_KEY_1 0x66
#define STMPE_KPC_COMBI_KEY_2 0x67
#define STMPE_KPC_DATA_BYTE0 0x68
#define STMPE_KPC_DATA_BYTE1 0x69
#define STMPE_KPC_DATA_BYTE2 0x6a
#define STMPE_KPC_DATA_BYTE3 0x6b
#define STMPE_KPC_DATA_BYTE4 0x6c
#define STMPE_KPC_CTRL_LSB_SCAN (0x1 << 0)
#define STMPE_KPC_CTRL_LSB_DEBOUNCE (0x7f << 1)
#define STMPE_KPC_CTRL_MSB_SCAN_COUNT (0xf << 4)
#define STMPE_KPC_ROW_MSB_ROWS 0xff
#define STMPE_KPC_DATA_UP (0x1 << 7)
#define STMPE_KPC_DATA_ROW (0xf << 3)
#define STMPE_KPC_DATA_COL (0x7 << 0)
#define STMPE_KPC_DATA_NOKEY_MASK 0x78
#define STMPE_KEYPAD_MAX_DEBOUNCE 127
#define STMPE_KEYPAD_MAX_SCAN_COUNT 15
#define STMPE_KEYPAD_MAX_ROWS 8
#define STMPE_KEYPAD_MAX_COLS 8
#define STMPE_KEYPAD_ROW_SHIFT 3
#define STMPE_KEYPAD_KEYMAP_MAX_SIZE \
(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)
/**
* struct stmpe_keypad_variant - model-specific attributes
* @auto_increment: whether the KPC_DATA_BYTE register address
* auto-increments on multiple read
* @set_pullup: whether the pins need to have their pull-ups set
* @num_data: number of data bytes
* @num_normal_data: number of normal keys' data bytes
* @max_cols: maximum number of columns supported
* @max_rows: maximum number of rows supported
* @col_gpios: bitmask of gpios which can be used for columns
* @row_gpios: bitmask of gpios which can be used for rows
*/
struct stmpe_keypad_variant {
bool auto_increment;
bool set_pullup;
int num_data;
int num_normal_data;
int max_cols;
int max_rows;
unsigned int col_gpios;
unsigned int row_gpios;
};
static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
[STMPE1601] = {
.auto_increment = true,
.num_data = 5,
.num_normal_data = 3,
.max_cols = 8,
.max_rows = 8,
.col_gpios = 0x000ff, /* GPIO 0 - 7 */
.row_gpios = 0x0ff00, /* GPIO 8 - 15 */
},
[STMPE2401] = {
.auto_increment = false,
.set_pullup = true,
.num_data = 3,
.num_normal_data = 2,
.max_cols = 8,
.max_rows = 12,
.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
.row_gpios = 0x1f7f00, /* GPIO 8-14, 16-20 */
},
[STMPE2403] = {
.auto_increment = true,
.set_pullup = true,
.num_data = 5,
.num_normal_data = 3,
.max_cols = 8,
.max_rows = 12,
.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
},
};
/**
* struct stmpe_keypad - STMPE keypad state container
* @stmpe: pointer to parent STMPE device
* @input: spawned input device
* @variant: STMPE variant
* @debounce_ms: debounce interval, in ms. Maximum is
* %STMPE_KEYPAD_MAX_DEBOUNCE.
* @scan_count: number of key scanning cycles to confirm key data.
* Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
* @no_autorepeat: disable key autorepeat
* @rows: bitmask for the rows
* @cols: bitmask for the columns
* @keymap: the keymap
*/
struct stmpe_keypad {
struct stmpe *stmpe;
struct input_dev *input;
const struct stmpe_keypad_variant *variant;
unsigned int debounce_ms;
unsigned int scan_count;
bool no_autorepeat;
unsigned int rows;
unsigned int cols;
unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_SIZE];
};
static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
{
const struct stmpe_keypad_variant *variant = keypad->variant;
struct stmpe *stmpe = keypad->stmpe;
int ret;
int i;
if (variant->auto_increment)
return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
variant->num_data, data);
for (i = 0; i < variant->num_data; i++) {
ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
if (ret < 0)
return ret;
data[i] = ret;
}
return 0;
}
static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
{
struct stmpe_keypad *keypad = dev;
struct input_dev *input = keypad->input;
const struct stmpe_keypad_variant *variant = keypad->variant;
u8 fifo[variant->num_data];
int ret;
int i;
ret = stmpe_keypad_read_data(keypad, fifo);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < variant->num_normal_data; i++) {
u8 data = fifo[i];
int row = (data & STMPE_KPC_DATA_ROW) >> 3;
int col = data & STMPE_KPC_DATA_COL;
int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
bool up = data & STMPE_KPC_DATA_UP;
if ((data & STMPE_KPC_DATA_NOKEY_MASK)
== STMPE_KPC_DATA_NOKEY_MASK)
continue;
input_event(input, EV_MSC, MSC_SCAN, code);
input_report_key(input, keypad->keymap[code], !up);
input_sync(input);
}
return IRQ_HANDLED;
}
static int stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
{
const struct stmpe_keypad_variant *variant = keypad->variant;
unsigned int col_gpios = variant->col_gpios;
unsigned int row_gpios = variant->row_gpios;
struct stmpe *stmpe = keypad->stmpe;
u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB];
unsigned int pins = 0;
unsigned int pu_pins = 0;
int ret;
int i;
/*
* Figure out which pins need to be set to the keypad alternate
* function.
*
* {cols,rows}_gpios are bitmasks of which pins on the chip can be used
* for the keypad.
*
* keypad->{cols,rows} are a bitmask of which pins (of the ones useable
* for the keypad) are used on the board.
*/
for (i = 0; i < variant->max_cols; i++) {
int num = __ffs(col_gpios);
if (keypad->cols & (1 << i)) {
pins |= 1 << num;
pu_pins |= 1 << num;
}
col_gpios &= ~(1 << num);
}
for (i = 0; i < variant->max_rows; i++) {
int num = __ffs(row_gpios);
if (keypad->rows & (1 << i))
pins |= 1 << num;
row_gpios &= ~(1 << num);
}
ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
if (ret)
return ret;
/*
* On STMPE24xx, set pin bias to pull-up on all keypad input
* pins (columns), this incidentally happen to be maximum 8 pins
* and placed at GPIO0-7 so only the LSB of the pull up register
* ever needs to be written.
*/
if (variant->set_pullup) {
u8 val;
ret = stmpe_reg_read(stmpe, pureg);
if (ret)
return ret;
/* Do not touch unused pins, may be used for GPIO */
val = ret & ~pu_pins;
val |= pu_pins;
ret = stmpe_reg_write(stmpe, pureg, val);
}
return 0;
}
static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
{
const struct stmpe_keypad_variant *variant = keypad->variant;
struct stmpe *stmpe = keypad->stmpe;
int ret;
if (keypad->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
return -EINVAL;
if (keypad->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
return -EINVAL;
ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
if (ret < 0)
return ret;
ret = stmpe_keypad_altfunc_init(keypad);
if (ret < 0)
return ret;
ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
if (ret < 0)
return ret;
ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
if (ret < 0)
return ret;
if (variant->max_rows > 8) {
ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
STMPE_KPC_ROW_MSB_ROWS,
keypad->rows >> 8);
if (ret < 0)
return ret;
}
ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
STMPE_KPC_CTRL_MSB_SCAN_COUNT,
keypad->scan_count << 4);
if (ret < 0)
return ret;
return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
STMPE_KPC_CTRL_LSB_SCAN |
STMPE_KPC_CTRL_LSB_DEBOUNCE,
STMPE_KPC_CTRL_LSB_SCAN |
(keypad->debounce_ms << 1));
}
static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
u32 used_rows, u32 used_cols)
{
int row, col;
for (row = 0; row < used_rows; row++) {
for (col = 0; col < used_cols; col++) {
int code = MATRIX_SCAN_CODE(row, col,
STMPE_KEYPAD_ROW_SHIFT);
if (keypad->keymap[code] != KEY_RESERVED) {
keypad->rows |= 1 << row;
keypad->cols |= 1 << col;
}
}
}
}
static int stmpe_keypad_probe(struct platform_device *pdev)
{
struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.of_node;
struct stmpe_keypad *keypad;
struct input_dev *input;
u32 rows;
u32 cols;
int error;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad),
GFP_KERNEL);
if (!keypad)
return -ENOMEM;
keypad->stmpe = stmpe;
keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
input->name = "STMPE keypad";
input->id.bustype = BUS_I2C;
input->dev.parent = &pdev->dev;
error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
if (error)
return error;
error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
keypad->keymap, input);
if (error)
return error;
input_set_capability(input, EV_MSC, MSC_SCAN);
if (!keypad->no_autorepeat)
__set_bit(EV_REP, input->evbit);
stmpe_keypad_fill_used_pins(keypad, rows, cols);
keypad->input = input;
error = stmpe_keypad_chip_init(keypad);
if (error < 0)
return error;
error = devm_request_threaded_irq(&pdev->dev, irq,
NULL, stmpe_keypad_irq,
IRQF_ONESHOT, "stmpe-keypad", keypad);
if (error) {
dev_err(&pdev->dev, "unable to get irq: %d\n", error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev,
"unable to register input device: %d\n", error);
return error;
}
platform_set_drvdata(pdev, keypad);
return 0;
}
static int stmpe_keypad_remove(struct platform_device *pdev)
{
struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD);
return 0;
}
static struct platform_driver stmpe_keypad_driver = {
.driver.name = "stmpe-keypad",
.driver.owner = THIS_MODULE,
.probe = stmpe_keypad_probe,
.remove = stmpe_keypad_remove,
};
module_platform_driver(stmpe_keypad_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STMPExxxx keypad driver");
MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");