513 lines
13 KiB
C
513 lines
13 KiB
C
// 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: Jayeeta Banerjee <jayeeta.banerjee@stericsson.com>
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* Author: Sundar Iyer <sundar.iyer@stericsson.com>
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*
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* TC35893 MFD Keypad Controller driver
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/mfd/tc3589x.h>
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#include <linux/device.h>
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/* Maximum supported keypad matrix row/columns size */
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#define TC3589x_MAX_KPROW 8
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#define TC3589x_MAX_KPCOL 12
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/* keypad related Constants */
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#define TC3589x_MAX_DEBOUNCE_SETTLE 0xFF
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#define DEDICATED_KEY_VAL 0xFF
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/* Pull up/down masks */
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#define TC3589x_NO_PULL_MASK 0x0
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#define TC3589x_PULL_DOWN_MASK 0x1
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#define TC3589x_PULL_UP_MASK 0x2
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#define TC3589x_PULLUP_ALL_MASK 0xAA
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#define TC3589x_IO_PULL_VAL(index, mask) ((mask)<<((index)%4)*2)
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/* Bit masks for IOCFG register */
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#define IOCFG_BALLCFG 0x01
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#define IOCFG_IG 0x08
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#define KP_EVCODE_COL_MASK 0x0F
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#define KP_EVCODE_ROW_MASK 0x70
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#define KP_RELEASE_EVT_MASK 0x80
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#define KP_ROW_SHIFT 4
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#define KP_NO_VALID_KEY_MASK 0x7F
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/* bit masks for RESTCTRL register */
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#define TC3589x_KBDRST 0x2
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#define TC3589x_IRQRST 0x10
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#define TC3589x_RESET_ALL 0x1B
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/* KBDMFS register bit mask */
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#define TC3589x_KBDMFS_EN 0x1
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/* CLKEN register bitmask */
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#define KPD_CLK_EN 0x1
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/* RSTINTCLR register bit mask */
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#define IRQ_CLEAR 0x1
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/* bit masks for keyboard interrupts*/
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#define TC3589x_EVT_LOSS_INT 0x8
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#define TC3589x_EVT_INT 0x4
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#define TC3589x_KBD_LOSS_INT 0x2
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#define TC3589x_KBD_INT 0x1
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/* bit masks for keyboard interrupt clear*/
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#define TC3589x_EVT_INT_CLR 0x2
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#define TC3589x_KBD_INT_CLR 0x1
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/**
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* struct tc35893_keypad_platform_data - platform specific keypad data
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* @keymap_data: matrix scan code table for keycodes
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* @krow: mask for available rows, value is 0xFF
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* @kcol: mask for available columns, value is 0xFF
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* @debounce_period: platform specific debounce time
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* @settle_time: platform specific settle down time
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* @irqtype: type of interrupt, falling or rising edge
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* @enable_wakeup: specifies if keypad event can wake up system from sleep
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* @no_autorepeat: flag for auto repetition
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*/
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struct tc3589x_keypad_platform_data {
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const struct matrix_keymap_data *keymap_data;
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u8 krow;
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u8 kcol;
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u8 debounce_period;
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u8 settle_time;
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unsigned long irqtype;
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bool enable_wakeup;
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bool no_autorepeat;
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};
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/**
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* struct tc_keypad - data structure used by keypad driver
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* @tc3589x: pointer to tc35893
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* @input: pointer to input device object
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* @board: keypad platform device
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* @krow: number of rows
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* @kcol: number of columns
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* @keymap: matrix scan code table for keycodes
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* @keypad_stopped: holds keypad status
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*/
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struct tc_keypad {
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struct tc3589x *tc3589x;
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struct input_dev *input;
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const struct tc3589x_keypad_platform_data *board;
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unsigned int krow;
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unsigned int kcol;
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unsigned short *keymap;
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bool keypad_stopped;
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};
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static int tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
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{
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int ret;
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struct tc3589x *tc3589x = keypad->tc3589x;
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const struct tc3589x_keypad_platform_data *board = keypad->board;
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/* validate platform configuration */
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if (board->kcol > TC3589x_MAX_KPCOL || board->krow > TC3589x_MAX_KPROW)
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return -EINVAL;
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/* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
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ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
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(board->krow << KP_ROW_SHIFT) | board->kcol);
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if (ret < 0)
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return ret;
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/* configure dedicated key config, no dedicated key selected */
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ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
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if (ret < 0)
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return ret;
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ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
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if (ret < 0)
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return ret;
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/* Configure settle time */
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ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG,
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board->settle_time);
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if (ret < 0)
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return ret;
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/* Configure debounce time */
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ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE,
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board->debounce_period);
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if (ret < 0)
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return ret;
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/* Start of initialise keypad GPIOs */
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ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
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if (ret < 0)
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return ret;
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/* Configure pull-up resistors for all row GPIOs */
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ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
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TC3589x_PULLUP_ALL_MASK);
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if (ret < 0)
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return ret;
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ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
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TC3589x_PULLUP_ALL_MASK);
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if (ret < 0)
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return ret;
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/* Configure pull-up resistors for all column GPIOs */
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ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
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TC3589x_PULLUP_ALL_MASK);
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if (ret < 0)
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return ret;
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ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
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TC3589x_PULLUP_ALL_MASK);
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if (ret < 0)
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return ret;
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ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
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TC3589x_PULLUP_ALL_MASK);
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return ret;
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}
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#define TC35893_DATA_REGS 4
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#define TC35893_KEYCODE_FIFO_EMPTY 0x7f
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#define TC35893_KEYCODE_FIFO_CLEAR 0xff
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#define TC35893_KEYPAD_ROW_SHIFT 0x3
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static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
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{
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struct tc_keypad *keypad = dev;
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struct tc3589x *tc3589x = keypad->tc3589x;
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u8 i, row_index, col_index, kbd_code, up;
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u8 code;
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for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
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kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
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/* loop till fifo is empty and no more keys are pressed */
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if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
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kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
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continue;
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/* valid key is found */
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col_index = kbd_code & KP_EVCODE_COL_MASK;
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row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
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code = MATRIX_SCAN_CODE(row_index, col_index,
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TC35893_KEYPAD_ROW_SHIFT);
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up = kbd_code & KP_RELEASE_EVT_MASK;
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input_event(keypad->input, EV_MSC, MSC_SCAN, code);
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input_report_key(keypad->input, keypad->keymap[code], !up);
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input_sync(keypad->input);
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}
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/* clear IRQ */
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tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
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0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
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/* enable IRQ */
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tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
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0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
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return IRQ_HANDLED;
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}
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static int tc3589x_keypad_enable(struct tc_keypad *keypad)
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{
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struct tc3589x *tc3589x = keypad->tc3589x;
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int ret;
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/* pull the keypad module out of reset */
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ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
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if (ret < 0)
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return ret;
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/* configure KBDMFS */
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ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
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if (ret < 0)
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return ret;
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/* enable the keypad clock */
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ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
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if (ret < 0)
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return ret;
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/* clear pending IRQs */
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ret = tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
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if (ret < 0)
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return ret;
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/* enable the IRQs */
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ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
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TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
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if (ret < 0)
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return ret;
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keypad->keypad_stopped = false;
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return ret;
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}
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static int tc3589x_keypad_disable(struct tc_keypad *keypad)
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{
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struct tc3589x *tc3589x = keypad->tc3589x;
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int ret;
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/* clear IRQ */
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ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
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0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
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if (ret < 0)
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return ret;
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/* disable all interrupts */
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ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
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~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
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if (ret < 0)
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return ret;
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/* disable the keypad module */
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ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
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if (ret < 0)
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return ret;
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/* put the keypad module into reset */
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ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
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keypad->keypad_stopped = true;
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return ret;
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}
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static int tc3589x_keypad_open(struct input_dev *input)
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{
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int error;
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struct tc_keypad *keypad = input_get_drvdata(input);
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/* enable the keypad module */
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error = tc3589x_keypad_enable(keypad);
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if (error < 0) {
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dev_err(&input->dev, "failed to enable keypad module\n");
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return error;
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}
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error = tc3589x_keypad_init_key_hardware(keypad);
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if (error < 0) {
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dev_err(&input->dev, "failed to configure keypad module\n");
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return error;
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}
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return 0;
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}
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static void tc3589x_keypad_close(struct input_dev *input)
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{
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struct tc_keypad *keypad = input_get_drvdata(input);
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/* disable the keypad module */
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tc3589x_keypad_disable(keypad);
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}
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static const struct tc3589x_keypad_platform_data *
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tc3589x_keypad_of_probe(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct tc3589x_keypad_platform_data *plat;
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u32 cols, rows;
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u32 debounce_ms;
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int proplen;
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if (!np)
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return ERR_PTR(-ENODEV);
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plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
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if (!plat)
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return ERR_PTR(-ENOMEM);
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of_property_read_u32(np, "keypad,num-columns", &cols);
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of_property_read_u32(np, "keypad,num-rows", &rows);
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plat->kcol = (u8) cols;
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plat->krow = (u8) rows;
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if (!plat->krow || !plat->kcol ||
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plat->krow > TC_KPD_ROWS || plat->kcol > TC_KPD_COLUMNS) {
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dev_err(dev,
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"keypad columns/rows not properly specified (%ux%u)\n",
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plat->kcol, plat->krow);
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return ERR_PTR(-EINVAL);
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}
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if (!of_get_property(np, "linux,keymap", &proplen)) {
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dev_err(dev, "property linux,keymap not found\n");
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return ERR_PTR(-ENOENT);
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}
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plat->no_autorepeat = of_property_read_bool(np, "linux,no-autorepeat");
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plat->enable_wakeup = of_property_read_bool(np, "wakeup-source") ||
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/* legacy name */
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of_property_read_bool(np, "linux,wakeup");
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/* The custom delay format is ms/16 */
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of_property_read_u32(np, "debounce-delay-ms", &debounce_ms);
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if (debounce_ms)
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plat->debounce_period = debounce_ms * 16;
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else
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plat->debounce_period = TC_KPD_DEBOUNCE_PERIOD;
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plat->settle_time = TC_KPD_SETTLE_TIME;
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/* FIXME: should be property of the IRQ resource? */
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plat->irqtype = IRQF_TRIGGER_FALLING;
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return plat;
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}
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static int tc3589x_keypad_probe(struct platform_device *pdev)
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{
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struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
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struct tc_keypad *keypad;
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struct input_dev *input;
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const struct tc3589x_keypad_platform_data *plat;
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int error, irq;
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plat = tc3589x_keypad_of_probe(&pdev->dev);
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if (IS_ERR(plat)) {
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dev_err(&pdev->dev, "invalid keypad platform data\n");
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return PTR_ERR(plat);
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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 irq;
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keypad = devm_kzalloc(&pdev->dev, sizeof(struct tc_keypad),
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GFP_KERNEL);
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if (!keypad)
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return -ENOMEM;
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input = devm_input_allocate_device(&pdev->dev);
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if (!input) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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keypad->board = plat;
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keypad->input = input;
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keypad->tc3589x = tc3589x;
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input->id.bustype = BUS_I2C;
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input->name = pdev->name;
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input->dev.parent = &pdev->dev;
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input->open = tc3589x_keypad_open;
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input->close = tc3589x_keypad_close;
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error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
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TC3589x_MAX_KPROW, TC3589x_MAX_KPCOL,
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NULL, input);
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if (error) {
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dev_err(&pdev->dev, "Failed to build keymap\n");
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return error;
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}
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keypad->keymap = input->keycode;
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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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input_set_drvdata(input, keypad);
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tc3589x_keypad_disable(keypad);
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error = devm_request_threaded_irq(&pdev->dev, irq,
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NULL, tc3589x_keypad_irq,
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plat->irqtype | IRQF_ONESHOT,
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"tc3589x-keypad", keypad);
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if (error) {
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dev_err(&pdev->dev,
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"Could not allocate irq %d,error %d\n",
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irq, error);
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return error;
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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, "Could not register input device\n");
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return error;
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}
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/* let platform decide if keypad is a wakeup source or not */
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device_init_wakeup(&pdev->dev, plat->enable_wakeup);
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device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
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platform_set_drvdata(pdev, 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 tc3589x_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 tc_keypad *keypad = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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/* keypad is already off; we do nothing */
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if (keypad->keypad_stopped)
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return 0;
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/* if device is not a wakeup source, disable it for powersave */
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if (!device_may_wakeup(&pdev->dev))
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tc3589x_keypad_disable(keypad);
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else
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enable_irq_wake(irq);
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|
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",
|
|
.pm = &tc3589x_keypad_dev_pm_ops,
|
|
},
|
|
.probe = tc3589x_keypad_probe,
|
|
};
|
|
module_platform_driver(tc3589x_keypad_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
|
|
MODULE_DESCRIPTION("TC35893 Keypad Driver");
|
|
MODULE_ALIAS("platform:tc3589x-keypad");
|