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/*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
*
* License terms:GNU General Public License (GPL) version 2
*
* Keypad controller driver for the SKE (Scroll Key Encoder) module used in
* the Nomadik 8815 and Ux500 platforms.
*/
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_data/keypad-nomadik-ske.h>
/* SKE_CR bits */
#define SKE_KPMLT (0x1 << 6)
#define SKE_KPCN (0x7 << 3)
#define SKE_KPASEN (0x1 << 2)
#define SKE_KPASON (0x1 << 7)
/* SKE_IMSC bits */
#define SKE_KPIMA (0x1 << 2)
/* SKE_ICR bits */
#define SKE_KPICS (0x1 << 3)
#define SKE_KPICA (0x1 << 2)
/* SKE_RIS bits */
#define SKE_KPRISA (0x1 << 2)
#define SKE_KEYPAD_ROW_SHIFT 3
#define SKE_KPD_NUM_ROWS 8
#define SKE_KPD_NUM_COLS 8
/* keypad auto scan registers */
#define SKE_ASR0 0x20
#define SKE_ASR1 0x24
#define SKE_ASR2 0x28
#define SKE_ASR3 0x2C
#define SKE_NUM_ASRX_REGISTERS (4)
#define KEY_PRESSED_DELAY 10
/**
* struct ske_keypad - data structure used by keypad driver
* @irq: irq no
* @reg_base: ske regsiters base address
* @input: pointer to input device object
* @board: keypad platform device
* @keymap: matrix scan code table for keycodes
* @clk: clock structure pointer
*/
struct ske_keypad {
int irq;
void __iomem *reg_base;
struct input_dev *input;
const struct ske_keypad_platform_data *board;
unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
struct clk *clk;
spinlock_t ske_keypad_lock;
};
static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
u8 mask, u8 data)
{
u32 ret;
spin_lock(&keypad->ske_keypad_lock);
ret = readl(keypad->reg_base + addr);
ret &= ~mask;
ret |= data;
writel(ret, keypad->reg_base + addr);
spin_unlock(&keypad->ske_keypad_lock);
}
/*
* ske_keypad_chip_init: init keypad controller configuration
*
* Enable Multi key press detection, auto scan mode
*/
static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
{
u32 value;
int timeout = keypad->board->debounce_ms;
/* check SKE_RIS to be 0 */
while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
cpu_relax();
if (!timeout)
return -EINVAL;
/*
* set debounce value
* keypad dbounce is configured in DBCR[15:8]
* dbounce value in steps of 32/32.768 ms
*/
spin_lock(&keypad->ske_keypad_lock);
value = readl(keypad->reg_base + SKE_DBCR);
value = value & 0xff;
value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
writel(value, keypad->reg_base + SKE_DBCR);
spin_unlock(&keypad->ske_keypad_lock);
/* enable multi key detection */
ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
/*
* set up the number of columns
* KPCN[5:3] defines no. of keypad columns to be auto scanned
*/
value = (keypad->board->kcol - 1) << 3;
ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
/* clear keypad interrupt for auto(and pending SW) scans */
ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);
/* un-mask keypad interrupts */
ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
/* enable automatic scan */
ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
return 0;
}
static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
{
int row = 0, code, pos;
struct input_dev *input = keypad->input;
u32 ske_ris;
int key_pressed;
int num_of_rows;
/* find out the row */
num_of_rows = hweight8(status);
do {
pos = __ffs(status);
row = pos;
status &= ~(1 << pos);
code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
ske_ris = readl(keypad->reg_base + SKE_RIS);
key_pressed = ske_ris & SKE_KPRISA;
input_event(input, EV_MSC, MSC_SCAN, code);
input_report_key(input, keypad->keymap[code], key_pressed);
input_sync(input);
num_of_rows--;
} while (num_of_rows);
}
static void ske_keypad_read_data(struct ske_keypad *keypad)
{
u8 status;
int col = 0;
int ske_asr, i;
/*
* Read the auto scan registers
*
* Each SKE_ASRx (x=0 to x=3) contains two row values.
* lower byte contains row value for column 2*x,
* upper byte contains row value for column 2*x + 1
*/
for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
if (!ske_asr)
continue;
/* now that ASRx is zero, find out the coloumn x and row y */
status = ske_asr & 0xff;
if (status) {
col = i * 2;
ske_keypad_report(keypad, status, col);
}
status = (ske_asr & 0xff00) >> 8;
if (status) {
col = (i * 2) + 1;
ske_keypad_report(keypad, status, col);
}
}
}
static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
{
struct ske_keypad *keypad = dev_id;
int timeout = keypad->board->debounce_ms;
/* disable auto scan interrupt; mask the interrupt generated */
ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
cpu_relax();
/* SKEx registers are stable and can be read */
ske_keypad_read_data(keypad);
/* wait until raw interrupt is clear */
while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
msleep(KEY_PRESSED_DELAY);
/* enable auto scan interrupts */
ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
return IRQ_HANDLED;
}
static int __init ske_keypad_probe(struct platform_device *pdev)
{
const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
struct ske_keypad *keypad;
struct input_dev *input;
struct resource *res;
int irq;
int error;
if (!plat) {
dev_err(&pdev->dev, "invalid keypad platform data\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keypad irq\n");
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "missing platform resources\n");
return -EINVAL;
}
keypad = kzalloc(sizeof(struct ske_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->irq = irq;
keypad->board = plat;
keypad->input = input;
spin_lock_init(&keypad->ske_keypad_lock);
if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
dev_err(&pdev->dev, "failed to request I/O memory\n");
error = -EBUSY;
goto err_free_mem;
}
keypad->reg_base = ioremap(res->start, resource_size(res));
if (!keypad->reg_base) {
dev_err(&pdev->dev, "failed to remap I/O memory\n");
error = -ENXIO;
goto err_free_mem_region;
}
keypad->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(keypad->clk)) {
dev_err(&pdev->dev, "failed to get clk\n
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