Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * Driver for TCA8418 I2C keyboard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2011 Fuel7, Inc.  All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Kyle Manna <kyle.manna@fuel7.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * modify it under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * License v2 as published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * This program is distributed in the hope that it will be useful,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * but WITHOUT ANY WARRANTY; without even the implied warranty of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * General Public License for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * You should have received a copy of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * License along with this program; if not, write to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * Boston, MA 021110-1307, USA.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * If you can't comply with GPLv2, alternative licensing terms may be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * arranged. Please contact Fuel7, Inc. (http://fuel7.com/) for proprietary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * alternative licensing inquiries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/input/matrix_keypad.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) /* TCA8418 hardware limits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define TCA8418_MAX_ROWS	8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define TCA8418_MAX_COLS	10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /* TCA8418 register offsets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define REG_CFG			0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define REG_INT_STAT		0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define REG_KEY_LCK_EC		0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define REG_KEY_EVENT_A		0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define REG_KEY_EVENT_B		0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define REG_KEY_EVENT_C		0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define REG_KEY_EVENT_D		0x07
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define REG_KEY_EVENT_E		0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define REG_KEY_EVENT_F		0x09
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define REG_KEY_EVENT_G		0x0A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #define REG_KEY_EVENT_H		0x0B
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define REG_KEY_EVENT_I		0x0C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define REG_KEY_EVENT_J		0x0D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #define REG_KP_LCK_TIMER	0x0E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) #define REG_UNLOCK1		0x0F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #define REG_UNLOCK2		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #define REG_GPIO_INT_STAT1	0x11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) #define REG_GPIO_INT_STAT2	0x12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) #define REG_GPIO_INT_STAT3	0x13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #define REG_GPIO_DAT_STAT1	0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #define REG_GPIO_DAT_STAT2	0x15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define REG_GPIO_DAT_STAT3	0x16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define REG_GPIO_DAT_OUT1	0x17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define REG_GPIO_DAT_OUT2	0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #define REG_GPIO_DAT_OUT3	0x19
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #define REG_GPIO_INT_EN1	0x1A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #define REG_GPIO_INT_EN2	0x1B
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #define REG_GPIO_INT_EN3	0x1C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) #define REG_KP_GPIO1		0x1D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #define REG_KP_GPIO2		0x1E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) #define REG_KP_GPIO3		0x1F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) #define REG_GPI_EM1		0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #define REG_GPI_EM2		0x21
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) #define REG_GPI_EM3		0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) #define REG_GPIO_DIR1		0x23
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) #define REG_GPIO_DIR2		0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define REG_GPIO_DIR3		0x25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #define REG_GPIO_INT_LVL1	0x26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) #define REG_GPIO_INT_LVL2	0x27
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) #define REG_GPIO_INT_LVL3	0x28
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #define REG_DEBOUNCE_DIS1	0x29
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) #define REG_DEBOUNCE_DIS2	0x2A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #define REG_DEBOUNCE_DIS3	0x2B
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #define REG_GPIO_PULL1		0x2C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) #define REG_GPIO_PULL2		0x2D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #define REG_GPIO_PULL3		0x2E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) /* TCA8418 bit definitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) #define CFG_AI			BIT(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) #define CFG_GPI_E_CFG		BIT(6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) #define CFG_OVR_FLOW_M		BIT(5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) #define CFG_INT_CFG		BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) #define CFG_OVR_FLOW_IEN	BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) #define CFG_K_LCK_IEN		BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) #define CFG_GPI_IEN		BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) #define CFG_KE_IEN		BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define INT_STAT_CAD_INT	BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define INT_STAT_OVR_FLOW_INT	BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define INT_STAT_K_LCK_INT	BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define INT_STAT_GPI_INT	BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define INT_STAT_K_INT		BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* TCA8418 register masks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #define KEY_LCK_EC_KEC		0x7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #define KEY_EVENT_CODE		0x7f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #define KEY_EVENT_VALUE		0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct tca8418_keypad {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	unsigned int row_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * Write a byte to the TCA8418
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static int tca8418_write_byte(struct tca8418_keypad *keypad_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			      int reg, u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	error = i2c_smbus_write_byte_data(keypad_data->client, reg, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		dev_err(&keypad_data->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			"%s failed, reg: %d, val: %d, error: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			__func__, reg, val, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^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)  * Read a byte from the TCA8418
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int tca8418_read_byte(struct tca8418_keypad *keypad_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			     int reg, u8 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	error = i2c_smbus_read_byte_data(keypad_data->client, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		dev_err(&keypad_data->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 				"%s failed, reg: %d, error: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 				__func__, reg, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	*val = (u8)error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	struct input_dev *input = keypad_data->input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	unsigned short *keymap = input->keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	int error, col, row;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	u8 reg, state, code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			dev_err(&keypad_data->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				"unable to read REG_KEY_EVENT_A\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		/* Assume that key code 0 signifies empty FIFO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		if (reg <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		state = reg & KEY_EVENT_VALUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		code  = reg & KEY_EVENT_CODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		row = code / TCA8418_MAX_COLS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		col = code % TCA8418_MAX_COLS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		row = (col) ? row : row - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		col = (col) ? col - 1 : TCA8418_MAX_COLS - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		input_event(input, EV_MSC, MSC_SCAN, code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		input_report_key(input, keymap[code], state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	} while (1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	input_sync(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  * Threaded IRQ handler and this can (and will) sleep.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static irqreturn_t tca8418_irq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct tca8418_keypad *keypad_data = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	u8 reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	error = tca8418_read_byte(keypad_data, REG_INT_STAT, &reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		dev_err(&keypad_data->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			"unable to read REG_INT_STAT\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (!reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (reg & INT_STAT_OVR_FLOW_INT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		dev_warn(&keypad_data->client->dev, "overflow occurred\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (reg & INT_STAT_K_INT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		tca8418_read_keypad(keypad_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	/* Clear all interrupts, even IRQs we didn't check (GPI, CAD, LCK) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	reg = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	error = tca8418_write_byte(keypad_data, REG_INT_STAT, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		dev_err(&keypad_data->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			"unable to clear REG_INT_STAT\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return IRQ_HANDLED;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * Configure the TCA8418 for keypad operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static int tca8418_configure(struct tca8418_keypad *keypad_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			     u32 rows, u32 cols)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	int reg, error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	/* Assemble a mask for row and column registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	reg  =  ~(~0 << rows);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	reg += (~(~0 << cols)) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	/* Set registers to keypad mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO1, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO2, reg >> 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	error |= tca8418_write_byte(keypad_data, REG_KP_GPIO3, reg >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* Enable column debouncing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS1, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS2, reg >> 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS3, reg >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	error = tca8418_write_byte(keypad_data, REG_CFG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 				CFG_INT_CFG | CFG_OVR_FLOW_IEN | CFG_KE_IEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static int tca8418_keypad_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 				const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct tca8418_keypad *keypad_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	u32 rows = 0, cols = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	int error, row_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	u8 reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	/* Check i2c driver capabilities */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		dev_err(dev, "%s adapter not supported\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			dev_driver_string(&client->adapter->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	error = matrix_keypad_parse_properties(dev, &rows, &cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (!rows || rows > TCA8418_MAX_ROWS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		dev_err(dev, "invalid rows\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (!cols || cols > TCA8418_MAX_COLS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		dev_err(dev, "invalid columns\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	row_shift = get_count_order(cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	/* Allocate memory for keypad_data and input device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (!keypad_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	keypad_data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	keypad_data->row_shift = row_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	/* Read key lock register, if this fails assume device not present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	error = tca8418_read_byte(keypad_data, REG_KEY_LCK_EC, &reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	/* Configure input device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	if (!input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	keypad_data->input = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	input->name = client->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	input->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	input->id.vendor  = 0x0001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	input->id.product = 0x001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	input->id.version = 0x0001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	error = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL, input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		dev_err(dev, "Failed to build keymap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (device_property_read_bool(dev, "keypad,autorepeat"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		__set_bit(EV_REP, input->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	input_set_capability(input, EV_MSC, MSC_SCAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	error = devm_request_threaded_irq(dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 					  NULL, tca8418_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 					  IRQF_SHARED | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 					  client->name, keypad_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		dev_err(dev, "Unable to claim irq %d; error %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			client->irq, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	/* Initialize the chip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	error = tca8418_configure(keypad_data, rows, cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	error = input_register_device(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		dev_err(dev, "Unable to register input device, error: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static const struct i2c_device_id tca8418_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	{ "tca8418", 8418, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) MODULE_DEVICE_TABLE(i2c, tca8418_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static const struct of_device_id tca8418_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	{ .compatible = "ti,tca8418", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static struct i2c_driver tca8418_keypad_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		.name	= "tca8418_keypad",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		.of_match_table = tca8418_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	.probe		= tca8418_keypad_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	.id_table	= tca8418_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static int __init tca8418_keypad_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return i2c_add_driver(&tca8418_keypad_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) subsys_initcall(tca8418_keypad_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) static void __exit tca8418_keypad_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	i2c_del_driver(&tca8418_keypad_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) module_exit(tca8418_keypad_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) MODULE_AUTHOR("Kyle Manna <kyle.manna@fuel7.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) MODULE_DESCRIPTION("Keypad driver for TCA8418");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) MODULE_LICENSE("GPL");