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437 lines
11 KiB
437 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson SA 2010 |
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* |
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* Author: Naveen Kumar G <[email protected]> for ST-Ericsson |
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* Author: Sundar Iyer <[email protected]> for ST-Ericsson |
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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 registers 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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* @pclk: clock structure pointer |
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* @ske_keypad_lock: spinlock protecting the keypad read/writes |
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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 == -1) |
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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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return -EINVAL; |
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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 <[email protected]> / Sundar Iyer <[email protected]>"); |
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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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