// SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved. */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/bitops.h> #include <linux/delay.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <linux/of.h> #include <linux/input/matrix_keypad.h> #define PM8XXX_MAX_ROWS … #define PM8XXX_MAX_COLS … #define PM8XXX_ROW_SHIFT … #define PM8XXX_MATRIX_MAX_SIZE … #define PM8XXX_MIN_ROWS … #define PM8XXX_MIN_COLS … #define MAX_SCAN_DELAY … #define MIN_SCAN_DELAY … /* in nanoseconds */ #define MAX_ROW_HOLD_DELAY … #define MIN_ROW_HOLD_DELAY … #define MAX_DEBOUNCE_TIME … #define MIN_DEBOUNCE_TIME … #define KEYP_CTRL … #define KEYP_CTRL_EVNTS … #define KEYP_CTRL_EVNTS_MASK … #define KEYP_CTRL_SCAN_COLS_SHIFT … #define KEYP_CTRL_SCAN_COLS_MIN … #define KEYP_CTRL_SCAN_COLS_BITS … #define KEYP_CTRL_SCAN_ROWS_SHIFT … #define KEYP_CTRL_SCAN_ROWS_MIN … #define KEYP_CTRL_SCAN_ROWS_BITS … #define KEYP_CTRL_KEYP_EN … #define KEYP_SCAN … #define KEYP_SCAN_READ_STATE … #define KEYP_SCAN_DBOUNCE_SHIFT … #define KEYP_SCAN_PAUSE_SHIFT … #define KEYP_SCAN_ROW_HOLD_SHIFT … #define KEYP_TEST … #define KEYP_TEST_CLEAR_RECENT_SCAN … #define KEYP_TEST_CLEAR_OLD_SCAN … #define KEYP_TEST_READ_RESET … #define KEYP_TEST_DTEST_EN … #define KEYP_TEST_ABORT_READ … #define KEYP_TEST_DBG_SELECT_SHIFT … /* bits of these registers represent * '0' for key press * '1' for key release */ #define KEYP_RECENT_DATA … #define KEYP_OLD_DATA … #define KEYP_CLOCK_FREQ … /** * struct pmic8xxx_kp - internal keypad data structure * @num_cols: number of columns of keypad * @num_rows: number of row of keypad * @input: input device pointer for keypad * @regmap: regmap handle * @key_sense_irq: key press/release irq number * @key_stuck_irq: key stuck notification irq number * @keycodes: array to hold the key codes * @dev: parent device pointer * @keystate: present key press/release state * @stuckstate: present state when key stuck irq * @ctrl_reg: control register value */ struct pmic8xxx_kp { … }; static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col) { … } /* * Synchronous read protocol for RevB0 onwards: * * 1. Write '1' to ReadState bit in KEYP_SCAN register * 2. Wait 2*32KHz clocks, so that HW can successfully enter read mode * synchronously * 3. Read rows in old array first if events are more than one * 4. Read rows in recent array * 5. Wait 4*32KHz clocks * 6. Write '0' to ReadState bit of KEYP_SCAN register so that hw can * synchronously exit read mode. */ static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp) { … } static int pmic8xxx_kp_read_data(struct pmic8xxx_kp *kp, u16 *state, u16 data_reg, int read_rows) { … } static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state, u16 *old_state) { … } static void __pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, u16 *new_state, u16 *old_state) { … } static bool pmic8xxx_detect_ghost_keys(struct pmic8xxx_kp *kp, u16 *new_state) { … } static int pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, unsigned int events) { … } /* * NOTE: We are reading recent and old data registers blindly * whenever key-stuck interrupt happens, because events counter doesn't * get updated when this interrupt happens due to key stuck doesn't get * considered as key state change. * * We are not using old data register contents after they are being read * because it might report the key which was pressed before the key being stuck * as stuck key because it's pressed status is stored in the old data * register. */ static irqreturn_t pmic8xxx_kp_stuck_irq(int irq, void *data) { … } static irqreturn_t pmic8xxx_kp_irq(int irq, void *data) { … } static int pmic8xxx_kpd_init(struct pmic8xxx_kp *kp, struct platform_device *pdev) { … } static int pmic8xxx_kp_enable(struct pmic8xxx_kp *kp) { … } static int pmic8xxx_kp_disable(struct pmic8xxx_kp *kp) { … } static int pmic8xxx_kp_open(struct input_dev *dev) { … } static void pmic8xxx_kp_close(struct input_dev *dev) { … } /* * keypad controller should be initialized in the following sequence * only, otherwise it might get into FSM stuck state. * * - Initialize keypad control parameters, like no. of rows, columns, * timing values etc., * - configure rows and column gpios pull up/down. * - set irq edge type. * - enable the keypad controller. */ static int pmic8xxx_kp_probe(struct platform_device *pdev) { … } static int pmic8xxx_kp_suspend(struct device *dev) { … } static int pmic8xxx_kp_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(pm8xxx_kp_pm_ops, pmic8xxx_kp_suspend, pmic8xxx_kp_resume); static const struct of_device_id pm8xxx_match_table[] = …; MODULE_DEVICE_TABLE(of, pm8xxx_match_table); static struct platform_driver pmic8xxx_kp_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …;
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