599 lines
15 KiB
C
599 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Microchip AT42QT1050 QTouch Sensor Controller
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*
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* Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
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*
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* Base on AT42QT1070 driver by:
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* Bo Shen <voice.shen@atmel.com>
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* Copyright (C) 2011 Atmel
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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/* Chip ID */
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#define QT1050_CHIP_ID 0x00
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#define QT1050_CHIP_ID_VER 0x46
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/* Firmware version */
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#define QT1050_FW_VERSION 0x01
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/* Detection status */
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#define QT1050_DET_STATUS 0x02
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/* Key status */
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#define QT1050_KEY_STATUS 0x03
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/* Key Signals */
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#define QT1050_KEY_SIGNAL_0_MSB 0x06
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#define QT1050_KEY_SIGNAL_0_LSB 0x07
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#define QT1050_KEY_SIGNAL_1_MSB 0x08
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#define QT1050_KEY_SIGNAL_1_LSB 0x09
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#define QT1050_KEY_SIGNAL_2_MSB 0x0c
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#define QT1050_KEY_SIGNAL_2_LSB 0x0d
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#define QT1050_KEY_SIGNAL_3_MSB 0x0e
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#define QT1050_KEY_SIGNAL_3_LSB 0x0f
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#define QT1050_KEY_SIGNAL_4_MSB 0x10
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#define QT1050_KEY_SIGNAL_4_LSB 0x11
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/* Reference data */
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#define QT1050_REF_DATA_0_MSB 0x14
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#define QT1050_REF_DATA_0_LSB 0x15
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#define QT1050_REF_DATA_1_MSB 0x16
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#define QT1050_REF_DATA_1_LSB 0x17
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#define QT1050_REF_DATA_2_MSB 0x1a
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#define QT1050_REF_DATA_2_LSB 0x1b
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#define QT1050_REF_DATA_3_MSB 0x1c
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#define QT1050_REF_DATA_3_LSB 0x1d
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#define QT1050_REF_DATA_4_MSB 0x1e
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#define QT1050_REF_DATA_4_LSB 0x1f
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/* Negative threshold level */
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#define QT1050_NTHR_0 0x21
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#define QT1050_NTHR_1 0x22
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#define QT1050_NTHR_2 0x24
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#define QT1050_NTHR_3 0x25
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#define QT1050_NTHR_4 0x26
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/* Pulse / Scale */
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#define QT1050_PULSE_SCALE_0 0x28
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#define QT1050_PULSE_SCALE_1 0x29
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#define QT1050_PULSE_SCALE_2 0x2b
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#define QT1050_PULSE_SCALE_3 0x2c
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#define QT1050_PULSE_SCALE_4 0x2d
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/* Detection integrator counter / AKS */
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#define QT1050_DI_AKS_0 0x2f
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#define QT1050_DI_AKS_1 0x30
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#define QT1050_DI_AKS_2 0x32
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#define QT1050_DI_AKS_3 0x33
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#define QT1050_DI_AKS_4 0x34
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/* Charge Share Delay */
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#define QT1050_CSD_0 0x36
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#define QT1050_CSD_1 0x37
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#define QT1050_CSD_2 0x39
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#define QT1050_CSD_3 0x3a
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#define QT1050_CSD_4 0x3b
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/* Low Power Mode */
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#define QT1050_LPMODE 0x3d
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/* Calibration and Reset */
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#define QT1050_RES_CAL 0x3f
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#define QT1050_RES_CAL_RESET BIT(7)
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#define QT1050_RES_CAL_CALIBRATE BIT(1)
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#define QT1050_MAX_KEYS 5
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#define QT1050_RESET_TIME 255
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struct qt1050_key_regs {
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unsigned int nthr;
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unsigned int pulse_scale;
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unsigned int di_aks;
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unsigned int csd;
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};
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struct qt1050_key {
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u32 num;
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u32 charge_delay;
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u32 thr_cnt;
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u32 samples;
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u32 scale;
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u32 keycode;
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};
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struct qt1050_priv {
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struct i2c_client *client;
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struct input_dev *input;
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struct regmap *regmap;
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struct qt1050_key keys[QT1050_MAX_KEYS];
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unsigned short keycodes[QT1050_MAX_KEYS];
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u8 reg_keys;
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u8 last_keys;
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};
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static const struct qt1050_key_regs qt1050_key_regs_data[] = {
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{
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.nthr = QT1050_NTHR_0,
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.pulse_scale = QT1050_PULSE_SCALE_0,
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.di_aks = QT1050_DI_AKS_0,
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.csd = QT1050_CSD_0,
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}, {
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.nthr = QT1050_NTHR_1,
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.pulse_scale = QT1050_PULSE_SCALE_1,
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.di_aks = QT1050_DI_AKS_1,
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.csd = QT1050_CSD_1,
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}, {
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.nthr = QT1050_NTHR_2,
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.pulse_scale = QT1050_PULSE_SCALE_2,
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.di_aks = QT1050_DI_AKS_2,
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.csd = QT1050_CSD_2,
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}, {
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.nthr = QT1050_NTHR_3,
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.pulse_scale = QT1050_PULSE_SCALE_3,
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.di_aks = QT1050_DI_AKS_3,
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.csd = QT1050_CSD_3,
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}, {
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.nthr = QT1050_NTHR_4,
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.pulse_scale = QT1050_PULSE_SCALE_4,
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.di_aks = QT1050_DI_AKS_4,
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.csd = QT1050_CSD_4,
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}
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};
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static bool qt1050_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case QT1050_DET_STATUS:
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case QT1050_KEY_STATUS:
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case QT1050_KEY_SIGNAL_0_MSB:
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case QT1050_KEY_SIGNAL_0_LSB:
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case QT1050_KEY_SIGNAL_1_MSB:
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case QT1050_KEY_SIGNAL_1_LSB:
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case QT1050_KEY_SIGNAL_2_MSB:
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case QT1050_KEY_SIGNAL_2_LSB:
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case QT1050_KEY_SIGNAL_3_MSB:
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case QT1050_KEY_SIGNAL_3_LSB:
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case QT1050_KEY_SIGNAL_4_MSB:
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case QT1050_KEY_SIGNAL_4_LSB:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_range qt1050_readable_ranges[] = {
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regmap_reg_range(QT1050_CHIP_ID, QT1050_KEY_STATUS),
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regmap_reg_range(QT1050_KEY_SIGNAL_0_MSB, QT1050_KEY_SIGNAL_1_LSB),
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regmap_reg_range(QT1050_KEY_SIGNAL_2_MSB, QT1050_KEY_SIGNAL_4_LSB),
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regmap_reg_range(QT1050_REF_DATA_0_MSB, QT1050_REF_DATA_1_LSB),
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regmap_reg_range(QT1050_REF_DATA_2_MSB, QT1050_REF_DATA_4_LSB),
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regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
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regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
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regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
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regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
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regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
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regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
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regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
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regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
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};
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static const struct regmap_access_table qt1050_readable_table = {
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.yes_ranges = qt1050_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(qt1050_readable_ranges),
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};
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static const struct regmap_range qt1050_writeable_ranges[] = {
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regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
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regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
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regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
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regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
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regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
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regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
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regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
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regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
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};
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static const struct regmap_access_table qt1050_writeable_table = {
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.yes_ranges = qt1050_writeable_ranges,
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.n_yes_ranges = ARRAY_SIZE(qt1050_writeable_ranges),
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};
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static struct regmap_config qt1050_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = QT1050_RES_CAL,
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.cache_type = REGCACHE_RBTREE,
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.wr_table = &qt1050_writeable_table,
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.rd_table = &qt1050_readable_table,
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.volatile_reg = qt1050_volatile_reg,
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};
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static bool qt1050_identify(struct qt1050_priv *ts)
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{
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unsigned int val;
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int err;
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/* Read Chip ID */
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regmap_read(ts->regmap, QT1050_CHIP_ID, &val);
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if (val != QT1050_CHIP_ID_VER) {
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dev_err(&ts->client->dev, "ID %d not supported\n", val);
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return false;
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}
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/* Read firmware version */
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err = regmap_read(ts->regmap, QT1050_FW_VERSION, &val);
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if (err) {
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dev_err(&ts->client->dev, "could not read the firmware version\n");
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return false;
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}
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dev_info(&ts->client->dev, "AT42QT1050 firmware version %1d.%1d\n",
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val >> 4, val & 0xf);
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return true;
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}
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static irqreturn_t qt1050_irq_threaded(int irq, void *dev_id)
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{
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struct qt1050_priv *ts = dev_id;
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struct input_dev *input = ts->input;
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unsigned long new_keys, changed;
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unsigned int val;
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int i, err;
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/* Read the detected status register, thus clearing interrupt */
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err = regmap_read(ts->regmap, QT1050_DET_STATUS, &val);
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if (err) {
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dev_err(&ts->client->dev, "Fail to read detection status: %d\n",
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err);
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return IRQ_NONE;
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}
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/* Read which key changed, keys are not continuous */
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err = regmap_read(ts->regmap, QT1050_KEY_STATUS, &val);
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if (err) {
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dev_err(&ts->client->dev,
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"Fail to determine the key status: %d\n", err);
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return IRQ_NONE;
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}
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new_keys = (val & 0x70) >> 2 | (val & 0x6) >> 1;
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changed = ts->last_keys ^ new_keys;
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/* Report registered keys only */
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changed &= ts->reg_keys;
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for_each_set_bit(i, &changed, QT1050_MAX_KEYS)
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input_report_key(input, ts->keys[i].keycode,
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test_bit(i, &new_keys));
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ts->last_keys = new_keys;
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input_sync(input);
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return IRQ_HANDLED;
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}
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static const struct qt1050_key_regs *qt1050_get_key_regs(int key_num)
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{
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return &qt1050_key_regs_data[key_num];
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}
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static int qt1050_set_key(struct regmap *map, int number, int on)
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{
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const struct qt1050_key_regs *key_regs;
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key_regs = qt1050_get_key_regs(number);
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return regmap_update_bits(map, key_regs->di_aks, 0xfc,
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on ? BIT(4) : 0x00);
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}
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static int qt1050_apply_fw_data(struct qt1050_priv *ts)
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{
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struct regmap *map = ts->regmap;
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struct qt1050_key *button = &ts->keys[0];
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const struct qt1050_key_regs *key_regs;
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int i, err;
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/* Disable all keys and enable only the specified ones */
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for (i = 0; i < QT1050_MAX_KEYS; i++) {
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err = qt1050_set_key(map, i, 0);
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if (err)
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return err;
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}
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for (i = 0; i < QT1050_MAX_KEYS; i++, button++) {
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/* Keep KEY_RESERVED keys off */
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if (button->keycode == KEY_RESERVED)
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continue;
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err = qt1050_set_key(map, button->num, 1);
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if (err)
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return err;
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key_regs = qt1050_get_key_regs(button->num);
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err = regmap_write(map, key_regs->pulse_scale,
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(button->samples << 4) | (button->scale));
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if (err)
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return err;
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err = regmap_write(map, key_regs->csd, button->charge_delay);
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if (err)
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return err;
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err = regmap_write(map, key_regs->nthr, button->thr_cnt);
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if (err)
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return err;
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}
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return 0;
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}
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static int qt1050_parse_fw(struct qt1050_priv *ts)
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{
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struct device *dev = &ts->client->dev;
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struct fwnode_handle *child;
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int nbuttons;
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nbuttons = device_get_child_node_count(dev);
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if (nbuttons == 0 || nbuttons > QT1050_MAX_KEYS)
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return -ENODEV;
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device_for_each_child_node(dev, child) {
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struct qt1050_key button;
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/* Required properties */
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if (fwnode_property_read_u32(child, "linux,code",
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&button.keycode)) {
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dev_err(dev, "Button without keycode\n");
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goto err;
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}
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if (button.keycode >= KEY_MAX) {
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dev_err(dev, "Invalid keycode 0x%x\n",
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button.keycode);
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goto err;
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}
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if (fwnode_property_read_u32(child, "reg",
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&button.num)) {
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dev_err(dev, "Button without pad number\n");
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goto err;
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}
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if (button.num < 0 || button.num > QT1050_MAX_KEYS - 1)
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goto err;
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ts->reg_keys |= BIT(button.num);
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/* Optional properties */
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if (fwnode_property_read_u32(child,
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"microchip,pre-charge-time-ns",
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&button.charge_delay)) {
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button.charge_delay = 0;
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} else {
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if (button.charge_delay % 2500 == 0)
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button.charge_delay =
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button.charge_delay / 2500;
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else
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button.charge_delay = 0;
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}
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if (fwnode_property_read_u32(child, "microchip,average-samples",
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&button.samples)) {
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button.samples = 0;
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} else {
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if (is_power_of_2(button.samples))
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button.samples = ilog2(button.samples);
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else
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button.samples = 0;
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}
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if (fwnode_property_read_u32(child, "microchip,average-scaling",
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&button.scale)) {
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button.scale = 0;
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} else {
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if (is_power_of_2(button.scale))
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button.scale = ilog2(button.scale);
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else
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button.scale = 0;
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}
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if (fwnode_property_read_u32(child, "microchip,threshold",
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&button.thr_cnt)) {
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button.thr_cnt = 20;
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} else {
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if (button.thr_cnt > 255)
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button.thr_cnt = 20;
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}
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ts->keys[button.num] = button;
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}
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return 0;
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err:
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fwnode_handle_put(child);
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return -EINVAL;
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}
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static int qt1050_probe(struct i2c_client *client)
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{
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struct qt1050_priv *ts;
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struct input_dev *input;
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struct device *dev = &client->dev;
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struct regmap *map;
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unsigned int status, i;
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int err;
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/* Check basic functionality */
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err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
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if (!err) {
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dev_err(&client->dev, "%s adapter not supported\n",
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dev_driver_string(&client->adapter->dev));
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return -ENODEV;
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}
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if (!client->irq) {
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dev_err(dev, "assign a irq line to this device\n");
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return -EINVAL;
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}
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ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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map = devm_regmap_init_i2c(client, &qt1050_regmap_config);
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if (IS_ERR(map))
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return PTR_ERR(map);
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ts->client = client;
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ts->input = input;
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ts->regmap = map;
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i2c_set_clientdata(client, ts);
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/* Identify the qt1050 chip */
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if (!qt1050_identify(ts))
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return -ENODEV;
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/* Get pdata */
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err = qt1050_parse_fw(ts);
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|
if (err) {
|
|
dev_err(dev, "Failed to parse firmware: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
input->name = "AT42QT1050 QTouch Sensor";
|
|
input->dev.parent = &client->dev;
|
|
input->id.bustype = BUS_I2C;
|
|
|
|
/* Add the keycode */
|
|
input->keycode = ts->keycodes;
|
|
input->keycodesize = sizeof(ts->keycodes[0]);
|
|
input->keycodemax = QT1050_MAX_KEYS;
|
|
|
|
__set_bit(EV_KEY, input->evbit);
|
|
for (i = 0; i < QT1050_MAX_KEYS; i++) {
|
|
ts->keycodes[i] = ts->keys[i].keycode;
|
|
__set_bit(ts->keycodes[i], input->keybit);
|
|
}
|
|
|
|
/* Trigger re-calibration */
|
|
err = regmap_update_bits(ts->regmap, QT1050_RES_CAL, 0x7f,
|
|
QT1050_RES_CAL_CALIBRATE);
|
|
if (err) {
|
|
dev_err(dev, "Trigger calibration failed: %d\n", err);
|
|
return err;
|
|
}
|
|
err = regmap_read_poll_timeout(ts->regmap, QT1050_DET_STATUS, status,
|
|
status >> 7 == 1, 10000, 200000);
|
|
if (err) {
|
|
dev_err(dev, "Calibration failed: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* Soft reset to set defaults */
|
|
err = regmap_update_bits(ts->regmap, QT1050_RES_CAL,
|
|
QT1050_RES_CAL_RESET, QT1050_RES_CAL_RESET);
|
|
if (err) {
|
|
dev_err(dev, "Trigger soft reset failed: %d\n", err);
|
|
return err;
|
|
}
|
|
msleep(QT1050_RESET_TIME);
|
|
|
|
/* Set pdata */
|
|
err = qt1050_apply_fw_data(ts);
|
|
if (err) {
|
|
dev_err(dev, "Failed to set firmware data: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = devm_request_threaded_irq(dev, client->irq, NULL,
|
|
qt1050_irq_threaded, IRQF_ONESHOT,
|
|
"qt1050", ts);
|
|
if (err) {
|
|
dev_err(&client->dev, "Failed to request irq: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* Clear #CHANGE line */
|
|
err = regmap_read(ts->regmap, QT1050_DET_STATUS, &status);
|
|
if (err) {
|
|
dev_err(dev, "Failed to clear #CHANGE line level: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* Register the input device */
|
|
err = input_register_device(ts->input);
|
|
if (err) {
|
|
dev_err(&client->dev, "Failed to register input device: %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qt1050_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct qt1050_priv *ts = i2c_get_clientdata(client);
|
|
|
|
disable_irq(client->irq);
|
|
|
|
/*
|
|
* Set measurement interval to 1s (125 x 8ms) if wakeup is allowed
|
|
* else turn off. The 1s interval seems to be a good compromise between
|
|
* low power and response time.
|
|
*/
|
|
return regmap_write(ts->regmap, QT1050_LPMODE,
|
|
device_may_wakeup(dev) ? 125 : 0);
|
|
}
|
|
|
|
static int qt1050_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct qt1050_priv *ts = i2c_get_clientdata(client);
|
|
|
|
enable_irq(client->irq);
|
|
|
|
/* Set measurement interval back to 16ms (2 x 8ms) */
|
|
return regmap_write(ts->regmap, QT1050_LPMODE, 2);
|
|
}
|
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(qt1050_pm_ops, qt1050_suspend, qt1050_resume);
|
|
|
|
static const struct of_device_id __maybe_unused qt1050_of_match[] = {
|
|
{ .compatible = "microchip,qt1050", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qt1050_of_match);
|
|
|
|
static struct i2c_driver qt1050_driver = {
|
|
.driver = {
|
|
.name = "qt1050",
|
|
.of_match_table = of_match_ptr(qt1050_of_match),
|
|
.pm = pm_sleep_ptr(&qt1050_pm_ops),
|
|
},
|
|
.probe_new = qt1050_probe,
|
|
};
|
|
|
|
module_i2c_driver(qt1050_driver);
|
|
|
|
MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de");
|
|
MODULE_DESCRIPTION("Driver for AT42QT1050 QTouch sensor");
|
|
MODULE_LICENSE("GPL v2");
|