439 lines
11 KiB
C
439 lines
11 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
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* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
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*
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* License terms:GNU General Public License (GPL) version 2
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*
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* Keypad controller driver for the SKE (Scroll Key Encoder) module used in
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* the Nomadik 8815 and Ux500 platforms.
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*/
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/platform_data/keypad-nomadik-ske.h>
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/* SKE_CR bits */
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#define SKE_KPMLT (0x1 << 6)
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#define SKE_KPCN (0x7 << 3)
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#define SKE_KPASEN (0x1 << 2)
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#define SKE_KPASON (0x1 << 7)
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/* SKE_IMSC bits */
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#define SKE_KPIMA (0x1 << 2)
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/* SKE_ICR bits */
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#define SKE_KPICS (0x1 << 3)
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#define SKE_KPICA (0x1 << 2)
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/* SKE_RIS bits */
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#define SKE_KPRISA (0x1 << 2)
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#define SKE_KEYPAD_ROW_SHIFT 3
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#define SKE_KPD_NUM_ROWS 8
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#define SKE_KPD_NUM_COLS 8
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/* keypad auto scan registers */
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#define SKE_ASR0 0x20
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#define SKE_ASR1 0x24
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#define SKE_ASR2 0x28
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#define SKE_ASR3 0x2C
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#define SKE_NUM_ASRX_REGISTERS (4)
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#define KEY_PRESSED_DELAY 10
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/**
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* struct ske_keypad - data structure used by keypad driver
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* @irq: irq no
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* @reg_base: ske regsiters base address
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* @input: pointer to input device object
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* @board: keypad platform device
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* @keymap: matrix scan code table for keycodes
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* @clk: clock structure pointer
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*/
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struct ske_keypad {
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int irq;
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void __iomem *reg_base;
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struct input_dev *input;
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const struct ske_keypad_platform_data *board;
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unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
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struct clk *clk;
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struct clk *pclk;
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spinlock_t ske_keypad_lock;
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};
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static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
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u8 mask, u8 data)
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{
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u32 ret;
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spin_lock(&keypad->ske_keypad_lock);
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ret = readl(keypad->reg_base + addr);
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ret &= ~mask;
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ret |= data;
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writel(ret, keypad->reg_base + addr);
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spin_unlock(&keypad->ske_keypad_lock);
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}
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/*
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* ske_keypad_chip_init: init keypad controller configuration
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*
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* Enable Multi key press detection, auto scan mode
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*/
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static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
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{
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u32 value;
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int timeout = keypad->board->debounce_ms;
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/* check SKE_RIS to be 0 */
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while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
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cpu_relax();
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if (!timeout)
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return -EINVAL;
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/*
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* set debounce value
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* keypad dbounce is configured in DBCR[15:8]
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* dbounce value in steps of 32/32.768 ms
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*/
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spin_lock(&keypad->ske_keypad_lock);
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value = readl(keypad->reg_base + SKE_DBCR);
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value = value & 0xff;
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value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
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writel(value, keypad->reg_base + SKE_DBCR);
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spin_unlock(&keypad->ske_keypad_lock);
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/* enable multi key detection */
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ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
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/*
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* set up the number of columns
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* KPCN[5:3] defines no. of keypad columns to be auto scanned
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*/
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value = (keypad->board->kcol - 1) << 3;
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ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
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/* clear keypad interrupt for auto(and pending SW) scans */
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ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);
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/* un-mask keypad interrupts */
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ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
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/* enable automatic scan */
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ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
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return 0;
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}
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static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
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{
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int row = 0, code, pos;
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struct input_dev *input = keypad->input;
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u32 ske_ris;
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int key_pressed;
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int num_of_rows;
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/* find out the row */
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num_of_rows = hweight8(status);
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do {
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pos = __ffs(status);
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row = pos;
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status &= ~(1 << pos);
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code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
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ske_ris = readl(keypad->reg_base + SKE_RIS);
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key_pressed = ske_ris & SKE_KPRISA;
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input_event(input, EV_MSC, MSC_SCAN, code);
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input_report_key(input, keypad->keymap[code], key_pressed);
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input_sync(input);
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num_of_rows--;
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} while (num_of_rows);
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}
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static void ske_keypad_read_data(struct ske_keypad *keypad)
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{
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u8 status;
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int col = 0;
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int ske_asr, i;
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/*
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* Read the auto scan registers
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*
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* Each SKE_ASRx (x=0 to x=3) contains two row values.
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* lower byte contains row value for column 2*x,
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* upper byte contains row value for column 2*x + 1
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*/
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for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
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ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
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if (!ske_asr)
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continue;
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/* now that ASRx is zero, find out the coloumn x and row y */
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status = ske_asr & 0xff;
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if (status) {
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col = i * 2;
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ske_keypad_report(keypad, status, col);
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}
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status = (ske_asr & 0xff00) >> 8;
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if (status) {
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col = (i * 2) + 1;
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ske_keypad_report(keypad, status, col);
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}
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}
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}
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static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
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{
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struct ske_keypad *keypad = dev_id;
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int timeout = keypad->board->debounce_ms;
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/* disable auto scan interrupt; mask the interrupt generated */
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ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
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ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
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while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
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cpu_relax();
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/* SKEx registers are stable and can be read */
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ske_keypad_read_data(keypad);
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/* wait until raw interrupt is clear */
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while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
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msleep(KEY_PRESSED_DELAY);
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/* enable auto scan interrupts */
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ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
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return IRQ_HANDLED;
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}
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static int __init ske_keypad_probe(struct platform_device *pdev)
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{
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const struct ske_keypad_platform_data *plat =
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dev_get_platdata(&pdev->dev);
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struct ske_keypad *keypad;
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struct input_dev *input;
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struct resource *res;
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int irq;
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int error;
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if (!plat) {
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dev_err(&pdev->dev, "invalid keypad platform data\n");
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return -EINVAL;
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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 -EINVAL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "missing platform resources\n");
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return -EINVAL;
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}
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keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
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input = input_allocate_device();
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if (!keypad || !input) {
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dev_err(&pdev->dev, "failed to allocate keypad memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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keypad->irq = irq;
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keypad->board = plat;
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keypad->input = input;
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spin_lock_init(&keypad->ske_keypad_lock);
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if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
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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 err_free_mem;
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}
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keypad->reg_base = ioremap(res->start, resource_size(res));
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if (!keypad->reg_base) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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error = -ENXIO;
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goto err_free_mem_region;
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}
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keypad->pclk = clk_get(&pdev->dev, "apb_pclk");
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if (IS_ERR(keypad->pclk)) {
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dev_err(&pdev->dev, "failed to get pclk\n");
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error = PTR_ERR(keypad->pclk);
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goto err_iounmap;
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}
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keypad->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(keypad->clk)) {
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dev_err(&pdev->dev, "failed to get clk\n");
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error = PTR_ERR(keypad->clk);
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goto err_pclk;
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}
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input->id.bustype = BUS_HOST;
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input->name = "ux500-ske-keypad";
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input->dev.parent = &pdev->dev;
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error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
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SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
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keypad->keymap, input);
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if (error) {
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dev_err(&pdev->dev, "Failed to build keymap\n");
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goto err_clk;
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}
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input_set_capability(input, EV_MSC, MSC_SCAN);
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if (!plat->no_autorepeat)
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__set_bit(EV_REP, input->evbit);
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error = clk_prepare_enable(keypad->pclk);
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if (error) {
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dev_err(&pdev->dev, "Failed to prepare/enable pclk\n");
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goto err_clk;
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}
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error = clk_prepare_enable(keypad->clk);
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if (error) {
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dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
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goto err_pclk_disable;
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}
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/* go through board initialization helpers */
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if (keypad->board->init)
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keypad->board->init();
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error = ske_keypad_chip_init(keypad);
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if (error) {
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dev_err(&pdev->dev, "unable to init keypad hardware\n");
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goto err_clk_disable;
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}
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error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
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IRQF_ONESHOT, "ske-keypad", keypad);
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if (error) {
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dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
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goto err_clk_disable;
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}
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error = input_register_device(input);
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if (error) {
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dev_err(&pdev->dev,
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"unable to register input device: %d\n", error);
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goto err_free_irq;
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}
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if (plat->wakeup_enable)
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device_init_wakeup(&pdev->dev, true);
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platform_set_drvdata(pdev, keypad);
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return 0;
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err_free_irq:
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free_irq(keypad->irq, keypad);
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err_clk_disable:
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clk_disable_unprepare(keypad->clk);
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err_pclk_disable:
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clk_disable_unprepare(keypad->pclk);
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err_clk:
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clk_put(keypad->clk);
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err_pclk:
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clk_put(keypad->pclk);
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err_iounmap:
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iounmap(keypad->reg_base);
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err_free_mem_region:
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release_mem_region(res->start, resource_size(res));
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err_free_mem:
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input_free_device(input);
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kfree(keypad);
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return error;
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}
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static int ske_keypad_remove(struct platform_device *pdev)
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{
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struct ske_keypad *keypad = platform_get_drvdata(pdev);
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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free_irq(keypad->irq, keypad);
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input_unregister_device(keypad->input);
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clk_disable_unprepare(keypad->clk);
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clk_put(keypad->clk);
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if (keypad->board->exit)
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keypad->board->exit();
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iounmap(keypad->reg_base);
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release_mem_region(res->start, resource_size(res));
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kfree(keypad);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int ske_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 ske_keypad *keypad = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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if (device_may_wakeup(dev))
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enable_irq_wake(irq);
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else
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ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
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return 0;
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}
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static int ske_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 ske_keypad *keypad = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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if (device_may_wakeup(dev))
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disable_irq_wake(irq);
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else
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ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
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ske_keypad_suspend, ske_keypad_resume);
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static struct platform_driver ske_keypad_driver = {
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.driver = {
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.name = "nmk-ske-keypad",
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.pm = &ske_keypad_dev_pm_ops,
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},
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.remove = ske_keypad_remove,
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};
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module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
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MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
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MODULE_ALIAS("platform:nomadik-ske-keypad");
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