^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) // Driver for the IMX keypad port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) // Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/input/matrix_keypad.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Keypad Controller registers (halfword)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define KPCR 0x00 /* Keypad Control Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define KPSR 0x02 /* Keypad Status Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define KDDR 0x04 /* Keypad Data Direction Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define KPDR 0x06 /* Keypad Data Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define MAX_MATRIX_KEY_ROWS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define MAX_MATRIX_KEY_COLS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define MATRIX_ROW_SHIFT 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct imx_keypad {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct input_dev *input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) void __iomem *mmio_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct timer_list check_matrix_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * The matrix is stable only if no changes are detected after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * IMX_KEYPAD_SCANS_FOR_STABILITY scans
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define IMX_KEYPAD_SCANS_FOR_STABILITY 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int stable_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) bool enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* Masks for enabled rows/cols */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unsigned short rows_en_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned short cols_en_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned short keycodes[MAX_MATRIX_KEY_NUM];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Matrix states:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * -stable: achieved after a complete debounce process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * -unstable: used in the debouncing process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* Scan the matrix and return the new state in *matrix_volatile_state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static void imx_keypad_scan_matrix(struct imx_keypad *keypad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) unsigned short *matrix_volatile_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned short reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if ((keypad->cols_en_mask & (1 << col)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Discharge keypad capacitance:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * 2. write 1s on column data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * 3. configure columns as totem-pole to discharge capacitance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * 4. configure columns as open-drain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) reg_val = readw(keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) reg_val |= 0xff00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) writew(reg_val, keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) reg_val = readw(keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) reg_val &= ~((keypad->cols_en_mask & 0xff) << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) writew(reg_val, keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) udelay(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) reg_val = readw(keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) reg_val |= (keypad->cols_en_mask & 0xff) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) writew(reg_val, keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * 5. Write a single column to 0, others to 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * 6. Sample row inputs and save data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * 7. Repeat steps 2 - 6 for remaining columns.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) reg_val = readw(keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) reg_val &= ~(1 << (8 + col));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) writew(reg_val, keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * Delay added to avoid propagating the 0 from column to row
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * when scanning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) udelay(5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * 1s in matrix_volatile_state[col] means key pressures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * throw data from non enabled rows.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) reg_val = readw(keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * Return in standby mode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * 9. write 0s to columns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) reg_val = readw(keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) reg_val &= 0x00ff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) writew(reg_val, keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * Compare the new matrix state (volatile) with the stable one stored in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * keypad->matrix_stable_state and fire events if changes are detected.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static void imx_keypad_fire_events(struct imx_keypad *keypad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) unsigned short *matrix_volatile_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct input_dev *input_dev = keypad->input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int row, col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) unsigned short bits_changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) int code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if ((keypad->cols_en_mask & (1 << col)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) continue; /* Column is not enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) bits_changed = keypad->matrix_stable_state[col] ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) matrix_volatile_state[col];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (bits_changed == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) continue; /* Column does not contain changes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if ((keypad->rows_en_mask & (1 << row)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) continue; /* Row is not enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if ((bits_changed & (1 << row)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) continue; /* Row does not contain changes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) input_event(input_dev, EV_MSC, MSC_SCAN, code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) input_report_key(input_dev, keypad->keycodes[code],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) matrix_volatile_state[col] & (1 << row));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) dev_dbg(&input_dev->dev, "Event code: %d, val: %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) keypad->keycodes[code],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) matrix_volatile_state[col] & (1 << row));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) input_sync(input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * imx_keypad_check_for_events is the timer handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static void imx_keypad_check_for_events(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct imx_keypad *keypad = from_timer(keypad, t, check_matrix_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) unsigned short reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) bool state_changed, is_zero_matrix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) imx_keypad_scan_matrix(keypad, matrix_volatile_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) state_changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if ((keypad->cols_en_mask & (1 << i)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) state_changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * If the matrix state is changed from the previous scan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * (Re)Begin the debouncing process, saving the new state in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * keypad->matrix_unstable_state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * Increase the count of number of scans with a stable state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (state_changed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) memcpy(keypad->matrix_unstable_state, matrix_volatile_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) sizeof(matrix_volatile_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) keypad->stable_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) keypad->stable_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * If the matrix is not as stable as we want reschedule scan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * in the near future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mod_timer(&keypad->check_matrix_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) jiffies + msecs_to_jiffies(10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * If the matrix state is stable, fire the events and save the new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * stable state. Note, if the matrix is kept stable for longer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * events have already been generated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) imx_keypad_fire_events(keypad, matrix_volatile_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) memcpy(keypad->matrix_stable_state, matrix_volatile_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) sizeof(matrix_volatile_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) is_zero_matrix = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (matrix_volatile_state[i] != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) is_zero_matrix = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (is_zero_matrix) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * All keys have been released. Enable only the KDI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * interrupt for future key presses (clear the KDI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * status bit and its sync chain before that).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) reg_val |= KBD_STAT_KDIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) reg_val &= ~KBD_STAT_KRIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * Some keys are still pressed. Schedule a rescan in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * attempt to detect multiple key presses and enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * the KRI interrupt to react quickly to key release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) mod_timer(&keypad->check_matrix_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) jiffies + msecs_to_jiffies(60));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) reg_val |= KBD_STAT_KRIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) reg_val &= ~KBD_STAT_KDIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) struct imx_keypad *keypad = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) unsigned short reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /* Disable both interrupt types */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) /* Clear interrupts status bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (keypad->enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* The matrix is supposed to be changed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) keypad->stable_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* Schedule the scanning procedure near in the future */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) mod_timer(&keypad->check_matrix_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) jiffies + msecs_to_jiffies(2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static void imx_keypad_config(struct imx_keypad *keypad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) unsigned short reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * Include enabled rows in interrupt generation (KPCR[7:0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * Configure keypad columns as open-drain (KPCR[15:8])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) reg_val = readw(keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) reg_val |= keypad->rows_en_mask & 0xff; /* rows */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) writew(reg_val, keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* Write 0's to KPDR[15:8] (Colums) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) reg_val = readw(keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) reg_val &= 0x00ff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) writew(reg_val, keypad->mmio_base + KPDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /* Configure columns as output, rows as input (KDDR[15:0]) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) writew(0xff00, keypad->mmio_base + KDDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * Clear Key Depress and Key Release status bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * Clear both synchronizer chain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) KBD_STAT_KDSC | KBD_STAT_KRSS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* Enable KDI and disable KRI (avoid false release events). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) reg_val |= KBD_STAT_KDIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) reg_val &= ~KBD_STAT_KRIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static void imx_keypad_inhibit(struct imx_keypad *keypad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) unsigned short reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* Inhibit KDI and KRI interrupts. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) reg_val = readw(keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) writew(reg_val, keypad->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /* Colums as open drain and disable all rows */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) reg_val = (keypad->cols_en_mask & 0xff) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) writew(reg_val, keypad->mmio_base + KPCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static void imx_keypad_close(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct imx_keypad *keypad = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) dev_dbg(&dev->dev, ">%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /* Mark keypad as being inactive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) keypad->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) synchronize_irq(keypad->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) del_timer_sync(&keypad->check_matrix_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) imx_keypad_inhibit(keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* Disable clock unit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) clk_disable_unprepare(keypad->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static int imx_keypad_open(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct imx_keypad *keypad = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) dev_dbg(&dev->dev, ">%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* Enable the kpp clock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) error = clk_prepare_enable(keypad->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* We became active from now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) keypad->enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) imx_keypad_config(keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /* Sanity control, not all the rows must be actived now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) dev_err(&dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) "too many keys pressed, control pins initialisation\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) goto open_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) open_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) imx_keypad_close(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static const struct of_device_id imx_keypad_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) { .compatible = "fsl,imx21-kpp", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) MODULE_DEVICE_TABLE(of, imx_keypad_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) static int imx_keypad_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) const struct matrix_keymap_data *keymap_data =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct imx_keypad *keypad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct input_dev *input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) int irq, error, i, row, col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (!keymap_data && !pdev->dev.of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) dev_err(&pdev->dev, "no keymap defined\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) input_dev = devm_input_allocate_device(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (!input_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) dev_err(&pdev->dev, "failed to allocate the input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (!keypad) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) dev_err(&pdev->dev, "not enough memory for driver data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) keypad->input_dev = input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) keypad->irq = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) keypad->stable_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) timer_setup(&keypad->check_matrix_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) imx_keypad_check_for_events, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (IS_ERR(keypad->mmio_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) return PTR_ERR(keypad->mmio_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) keypad->clk = devm_clk_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (IS_ERR(keypad->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) dev_err(&pdev->dev, "failed to get keypad clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return PTR_ERR(keypad->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) /* Init the Input device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) input_dev->name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) input_dev->id.bustype = BUS_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) input_dev->dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) input_dev->open = imx_keypad_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) input_dev->close = imx_keypad_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) error = matrix_keypad_build_keymap(keymap_data, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) MAX_MATRIX_KEY_ROWS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) MAX_MATRIX_KEY_COLS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) keypad->keycodes, input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) dev_err(&pdev->dev, "failed to build keymap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* Search for rows and cols enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) i = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (keypad->keycodes[i] != KEY_RESERVED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) keypad->rows_en_mask |= 1 << row;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) keypad->cols_en_mask |= 1 << col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) __set_bit(EV_REP, input_dev->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) input_set_capability(input_dev, EV_MSC, MSC_SCAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) input_set_drvdata(input_dev, keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /* Ensure that the keypad will stay dormant until opened */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) error = clk_prepare_enable(keypad->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) imx_keypad_inhibit(keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) clk_disable_unprepare(keypad->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) error = devm_request_irq(&pdev->dev, irq, imx_keypad_irq_handler, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) pdev->name, keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) dev_err(&pdev->dev, "failed to request IRQ\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) /* Register the input device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) error = input_register_device(input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) dev_err(&pdev->dev, "failed to register input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) platform_set_drvdata(pdev, keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) device_init_wakeup(&pdev->dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) static int __maybe_unused imx_kbd_noirq_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) struct imx_keypad *kbd = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct input_dev *input_dev = kbd->input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) unsigned short reg_val = readw(kbd->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) /* imx kbd can wake up system even clock is disabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) mutex_lock(&input_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) if (input_dev->users)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) clk_disable_unprepare(kbd->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) mutex_unlock(&input_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (device_may_wakeup(&pdev->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) if (reg_val & KBD_STAT_KPKD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) reg_val |= KBD_STAT_KRIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (reg_val & KBD_STAT_KPKR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) reg_val |= KBD_STAT_KDIE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) writew(reg_val, kbd->mmio_base + KPSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) enable_irq_wake(kbd->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) static int __maybe_unused imx_kbd_noirq_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) struct imx_keypad *kbd = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) struct input_dev *input_dev = kbd->input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (device_may_wakeup(&pdev->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) disable_irq_wake(kbd->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) mutex_lock(&input_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (input_dev->users) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) ret = clk_prepare_enable(kbd->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) goto err_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) err_clk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) mutex_unlock(&input_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) static const struct dev_pm_ops imx_kbd_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_kbd_noirq_suspend, imx_kbd_noirq_resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static struct platform_driver imx_keypad_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) .name = "imx-keypad",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) .pm = &imx_kbd_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) .of_match_table = of_match_ptr(imx_keypad_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) .probe = imx_keypad_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) module_platform_driver(imx_keypad_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) MODULE_DESCRIPTION("IMX Keypad Port Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) MODULE_ALIAS("platform:imx-keypad");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags