/*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Jayeeta Banerjee <jayeeta.banerjee@stericsson.com>
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
*
* License Terms: GNU General Public License, version 2
*
* TC35893 MFD Keypad Controller driver
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/input/matrix_keypad.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/mfd/tc3589x.h>
/* Maximum supported keypad matrix row/columns size */
#define TC3589x_MAX_KPROW 8
#define TC3589x_MAX_KPCOL 12
/* keypad related Constants */
#define TC3589x_MAX_DEBOUNCE_SETTLE 0xFF
#define DEDICATED_KEY_VAL 0xFF
/* Pull up/down masks */
#define TC3589x_NO_PULL_MASK 0x0
#define TC3589x_PULL_DOWN_MASK 0x1
#define TC3589x_PULL_UP_MASK 0x2
#define TC3589x_PULLUP_ALL_MASK 0xAA
#define TC3589x_IO_PULL_VAL(index, mask) ((mask)<<((index)%4)*2))
/* Bit masks for IOCFG register */
#define IOCFG_BALLCFG 0x01
#define IOCFG_IG 0x08
#define KP_EVCODE_COL_MASK 0x0F
#define KP_EVCODE_ROW_MASK 0x70
#define KP_RELEASE_EVT_MASK 0x80
#define KP_ROW_SHIFT 4
#define KP_NO_VALID_KEY_MASK 0x7F
/* bit masks for RESTCTRL register */
#define TC3589x_KBDRST 0x2
#define TC3589x_IRQRST 0x10
#define TC3589x_RESET_ALL 0x1B
/* KBDMFS register bit mask */
#define TC3589x_KBDMFS_EN 0x1
/* CLKEN register bitmask */
#define KPD_CLK_EN 0x1
/* RSTINTCLR register bit mask */
#define IRQ_CLEAR 0x1
/* bit masks for keyboard interrupts*/
#define TC3589x_EVT_LOSS_INT 0x8
#define TC3589x_EVT_INT 0x4
#define TC3589x_KBD_LOSS_INT 0x2
#define TC3589x_KBD_INT 0x1
/* bit masks for keyboard interrupt clear*/
#define TC3589x_EVT_INT_CLR 0x2
#define TC3589x_KBD_INT_CLR 0x1
#define TC3589x_KBD_KEYMAP_SIZE 64
/**
* struct tc_keypad - data structure used by keypad driver
* @input: pointer to input device object
* @board: keypad platform device
* @krow: number of rows
* @kcol: number of coloumns
* @keymap: matrix scan code table for keycodes
*/
struct tc_keypad {
struct tc3589x *tc3589x;
struct input_dev *input;
const struct tc3589x_keypad_platform_data *board;
unsigned int krow;
unsigned int kcol;
unsigned short keymap[TC3589x_KBD_KEYMAP_SIZE];
bool keypad_stopped;
};
static int __devinit tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
{
int ret;
struct tc3589x *tc3589x = keypad->tc3589x;
u8 settle_time = keypad->board->settle_time;
u8 dbounce_period = keypad->board->debounce_period;
u8 rows = keypad->board->krow & 0xf; /* mask out the nibble */
u8 column = keypad->board->kcol & 0xf; /* mask out the nibble */
/* validate platform configurations */
if (keypad->board->kcol > TC3589x_MAX_KPCOL ||
keypad->board->krow > TC3589x_MAX_KPROW ||
keypad->board->debounce_period > TC3589x_MAX_DEBOUNCE_SETTLE ||
keypad->board->settle_time > TC3589x_MAX_DEBOUNCE_SETTLE)
return -EINVAL;
/* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
(rows << KP_ROW_SHIFT) | column);
if (ret < 0)
return ret;
/* configure dedicated key config, no dedicated key selected */
ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
if (ret < 0)
return ret;
ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
if (ret < 0)
return ret;
/* Configure settle time */
ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG, settle_time);
if (ret < 0)
return ret;
/* Configure debounce time */
ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE, dbounce_period);
if (ret < 0)
return ret;
/* Start of initialise keypad GPIOs */
ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
if (ret < 0)
return ret;
/* Configure pull-up resistors for all row GPIOs */
ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
TC3589x_PULLUP_ALL_MASK);
if (ret < 0)
return ret;
ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
TC3589x_PULLUP_ALL_MASK);
if (ret < 0)
return ret;
/* Configure pull-up resistors for all column GPIOs */
ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
TC3589x_PULLUP_ALL_MASK);
if (ret < 0)
return ret;
ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
TC3589x_PULLUP_ALL_MASK);
if (ret < 0)
return ret;
ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
TC3589x_PULLUP_ALL_MASK);
return ret;
}
#define TC35893_DATA_REGS 4
#define TC35893_KEYCODE_FIFO_EMPTY 0x7f
#define TC35893_KEYCODE_FIFO_CLEAR 0xff
#define TC35893_KEYPAD_ROW_SHIFT 0x3
static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
{
struct tc_keypad *keypad = dev;
struct tc3589x *tc3589x = keypad->tc3589x;
u8 i, row_index, col_index, kbd_code, up;
u8 code;
for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
/* loop till fifo is empty and no more keys are pressed */
if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
continue;
/* valid key is found */
col_index = kbd_code & KP_EVCODE_COL_MASK;
row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
code = MATRIX_SCAN_CODE(row_index, col_index,
TC35893_KEYPAD_ROW_SHIFT);
up = kbd_code & KP_RELEASE_EVT_MASK;
input_event(keypad->input, EV_MSC, MSC_SCAN, code);
input_report_key(keypad->input, keypad->keymap[code], !up);
input_sync(keypad->input);
}
/* clear IRQ */
tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
/* enable IRQ */
tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
return IRQ_HANDLED;
}
static int tc3589x_keypad_enable(struct tc_keypad *keypad)
{
struct tc3589x *tc3589x = keypad->tc3589x;
int ret;
/* pull the keypad module out of reset */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
if (ret < 0)
return ret;
/* configure KBDMFS */
ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
if (ret < 0)
return ret;
/* enable the keypad clock */
ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
if (ret < 0)
return ret;
/* clear pending IRQs */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
if (ret < 0)
return ret;
/* enable the IRQs */
ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
if (ret < 0)
return ret;
keypad->keypad_stopped = false;
return ret;
}
static int tc3589x_keypad_disable(struct tc_keypad *keypad)
{
struct tc3589x *tc3589x = keypad->tc3589x;
int ret;
/* clear IRQ */
ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
if (ret < 0)
return ret;
/* disable all interrupts */
ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
if (ret < 0)
return ret;
/* disable the keypad module */
ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
if (ret < 0)
return ret;
/* put the keypad module into reset */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
keypad->keypad_stopped = true;
return ret;
}
static int tc3589x_keypad_open(struct input_dev *input)
{
int error;
struct tc_keypad *keypad = input_get_drvdata(input);
/* enable the keypad module */
error = tc3589x_keypad_enable(keypad);
if (error < 0) {
dev_err(&input->dev, "failed to enable keypad module\n");
return error;
}
error = tc3589x_keypad_init_key_hardware(keypad);
if (error < 0) {
dev_err(&input->dev, "failed to configure keypad module\n");
return error;
}
return 0;
}
static void tc3589x_keypad_close(struct input_dev *input)
{
struct tc_keypad *keypad = input_get_drvdata(input);
/* disable the keypad module */
tc3589x_keypad_disable(keypad);
}
static int __devinit tc3589x_keypad_probe(struct platform_device *pdev)
{
struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
struct tc_keypad *keypad;
struct input_dev *input;
const struct tc3589x_keypad_platform_data *plat;
int error, irq;
plat = tc3589x->pdata->keypad;
if (!plat) {
dev_err(&pdev->dev, "invalid keypad platform data\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
keypad = kzalloc(sizeof(struct tc_keypad), GFP_KERNEL);
input = input_allocate_device();
if (!keypad || !input) {
dev_err(&pdev->dev, "failed to allocate keypad memory\n");
error = -ENOMEM;
goto err_free_mem;
}
keypad->board = plat;
keypad->input = input;
keypad->tc3589x = tc3589x;
input->id.bustype = BUS_I2C;
input->name = pdev->name;
input->dev.parent = &pdev->dev;
input->keycode = keypad->keymap;
input->keycodesize = sizeof(keypad->keymap[0]);
input->keycodemax = ARRAY_SIZE(keypad->keymap);
input->open = tc3589x_keypad_open;
input->close = tc3589x_keypad_close;
input_set_drvdata(input, keypad);
input_set_capability(input, EV_MSC, MSC_SCAN);
__set_bit(EV_KEY, input->evbit);
if (!plat->no_autorepeat)
__set_bit(EV_REP, input->evbit);
matrix_keypad_build_keymap(plat->keymap_data, 0x3,
input->keycode, input->keybit);
error = request_threaded_irq(irq, NULL,
tc3589x_keypad_irq, plat->irqtype,
"tc3589x-keypad", keypad);
if (error < 0) {
dev_err(&pdev->dev,
"Could not allocate irq %d,error %d\n",
irq, error);
goto err_free_mem;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "Could not register input device\n");
goto err_free_irq;
}
/* let platform decide if keypad is a wakeup source or not */
device_init_wakeup(&pdev->dev, plat->enable_wakeup);
device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
platform_set_drvdata(pdev, keypad);
return 0;
err_free_irq:
free_irq(irq, keypad);
err_free_mem:
input_free_device(input);
kfree(keypad);
return error;
}
static int __devexit tc3589x_keypad_remove(struct platform_device *pdev)
{
struct tc_keypad *keypad = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
if (!keypad->keypad_stopped)
tc3589x_keypad_disable(keypad);
free_irq(irq, keypad);
input_unregister_device(keypad->input);
kfree(keypad);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tc3589x_keypad_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct tc_keypad *keypad = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
/* keypad is already off; we do nothing */
if (keypad->keypad_stopped)
return 0;
/* if device is not a wakeup source, disable it for powersave */
if (!device_may_wakeup(&pdev->dev))
tc3589x_keypad_disable(keypad);
else
enable_irq_wake(irq);
return 0;
}
static int tc3589x_keypad_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct tc_keypad *keypad = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
if (!keypad->keypad_stopped)
return 0;
/* enable the device to resume normal operations */
if (!device_may_wakeup(&pdev->dev))
tc3589x_keypad_enable(keypad);
else
disable_irq_wake(irq);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(tc3589x_keypad_dev_pm_ops,
tc3589x_keypad_suspend, tc3589x_keypad_resume);
static struct platform_driver tc3589x_keypad_driver = {
.driver = {
.name = "tc3589x-keypad",
.owner = THIS_MODULE,
.pm = &tc3589x_keypad_dev_pm_ops,
},
.probe = tc3589x_keypad_probe,
.remove = __devexit_p(tc3589x_keypad_remove),
};
static int __init tc3589x_keypad_init(void)
{
return platform_driver_register(&tc3589x_keypad_driver);
}
module_init(tc3589x_keypad_init);
static void __exit tc3589x_keypad_exit(void)
{
return platform_driver_unregister(&tc3589x_keypad_driver);
}
module_exit(tc3589x_keypad_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
MODULE_DESCRIPTION("TC35893 Keypad Driver");
MODULE_ALIAS("platform:tc3589x-keypad");