631 lines
16 KiB
C
631 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define MAX_FINGERS 2
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#define RESET_DELAY 30
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#define PENUP_TIMEOUT (10)
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#define DELTA_MIN 16
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#define MASK_BITS 0x03
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#define SHIFT_8 8
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#define SHIFT_2 2
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#define LENGTH_OF_BUFFER 11
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#define I2C_RETRY_COUNT 5
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#define BU21013_SENSORS_BTN_0_7_REG 0x70
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#define BU21013_SENSORS_BTN_8_15_REG 0x71
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#define BU21013_SENSORS_BTN_16_23_REG 0x72
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#define BU21013_X1_POS_MSB_REG 0x73
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#define BU21013_X1_POS_LSB_REG 0x74
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#define BU21013_Y1_POS_MSB_REG 0x75
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#define BU21013_Y1_POS_LSB_REG 0x76
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#define BU21013_X2_POS_MSB_REG 0x77
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#define BU21013_X2_POS_LSB_REG 0x78
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#define BU21013_Y2_POS_MSB_REG 0x79
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#define BU21013_Y2_POS_LSB_REG 0x7A
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#define BU21013_INT_CLR_REG 0xE8
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#define BU21013_INT_MODE_REG 0xE9
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#define BU21013_GAIN_REG 0xEA
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#define BU21013_OFFSET_MODE_REG 0xEB
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#define BU21013_XY_EDGE_REG 0xEC
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#define BU21013_RESET_REG 0xED
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#define BU21013_CALIB_REG 0xEE
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#define BU21013_DONE_REG 0xEF
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#define BU21013_SENSOR_0_7_REG 0xF0
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#define BU21013_SENSOR_8_15_REG 0xF1
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#define BU21013_SENSOR_16_23_REG 0xF2
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#define BU21013_POS_MODE1_REG 0xF3
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#define BU21013_POS_MODE2_REG 0xF4
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#define BU21013_CLK_MODE_REG 0xF5
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#define BU21013_IDLE_REG 0xFA
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#define BU21013_FILTER_REG 0xFB
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#define BU21013_TH_ON_REG 0xFC
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#define BU21013_TH_OFF_REG 0xFD
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#define BU21013_RESET_ENABLE 0x01
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#define BU21013_SENSORS_EN_0_7 0x3F
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#define BU21013_SENSORS_EN_8_15 0xFC
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#define BU21013_SENSORS_EN_16_23 0x1F
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#define BU21013_POS_MODE1_0 0x02
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#define BU21013_POS_MODE1_1 0x04
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#define BU21013_POS_MODE1_2 0x08
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#define BU21013_POS_MODE2_ZERO 0x01
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#define BU21013_POS_MODE2_AVG1 0x02
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#define BU21013_POS_MODE2_AVG2 0x04
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#define BU21013_POS_MODE2_EN_XY 0x08
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#define BU21013_POS_MODE2_EN_RAW 0x10
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#define BU21013_POS_MODE2_MULTI 0x80
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#define BU21013_CLK_MODE_DIV 0x01
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#define BU21013_CLK_MODE_EXT 0x02
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#define BU21013_CLK_MODE_CALIB 0x80
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#define BU21013_IDLET_0 0x01
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#define BU21013_IDLET_1 0x02
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#define BU21013_IDLET_2 0x04
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#define BU21013_IDLET_3 0x08
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#define BU21013_IDLE_INTERMIT_EN 0x10
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#define BU21013_DELTA_0_6 0x7F
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#define BU21013_FILTER_EN 0x80
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#define BU21013_INT_MODE_LEVEL 0x00
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#define BU21013_INT_MODE_EDGE 0x01
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#define BU21013_GAIN_0 0x01
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#define BU21013_GAIN_1 0x02
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#define BU21013_GAIN_2 0x04
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#define BU21013_OFFSET_MODE_DEFAULT 0x00
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#define BU21013_OFFSET_MODE_MOVE 0x01
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#define BU21013_OFFSET_MODE_DISABLE 0x02
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#define BU21013_TH_ON_0 0x01
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#define BU21013_TH_ON_1 0x02
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#define BU21013_TH_ON_2 0x04
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#define BU21013_TH_ON_3 0x08
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#define BU21013_TH_ON_4 0x10
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#define BU21013_TH_ON_5 0x20
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#define BU21013_TH_ON_6 0x40
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#define BU21013_TH_ON_7 0x80
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#define BU21013_TH_ON_MAX 0xFF
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#define BU21013_TH_OFF_0 0x01
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#define BU21013_TH_OFF_1 0x02
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#define BU21013_TH_OFF_2 0x04
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#define BU21013_TH_OFF_3 0x08
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#define BU21013_TH_OFF_4 0x10
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#define BU21013_TH_OFF_5 0x20
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#define BU21013_TH_OFF_6 0x40
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#define BU21013_TH_OFF_7 0x80
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#define BU21013_TH_OFF_MAX 0xFF
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#define BU21013_X_EDGE_0 0x01
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#define BU21013_X_EDGE_1 0x02
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#define BU21013_X_EDGE_2 0x04
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#define BU21013_X_EDGE_3 0x08
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#define BU21013_Y_EDGE_0 0x10
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#define BU21013_Y_EDGE_1 0x20
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#define BU21013_Y_EDGE_2 0x40
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#define BU21013_Y_EDGE_3 0x80
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#define BU21013_DONE 0x01
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#define BU21013_NUMBER_OF_X_SENSORS (6)
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#define BU21013_NUMBER_OF_Y_SENSORS (11)
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#define DRIVER_TP "bu21013_tp"
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/**
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* struct bu21013_ts - touch panel data structure
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* @client: pointer to the i2c client
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* @in_dev: pointer to the input device structure
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* @props: the device coordinate transformation properties
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* @regulator: pointer to the Regulator used for touch screen
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* @cs_gpiod: chip select GPIO line
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* @int_gpiod: touch interrupt GPIO line
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* @touch_x_max: maximum X coordinate reported by the device
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* @touch_y_max: maximum Y coordinate reported by the device
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* @x_flip: indicates that the driver should invert X coordinate before
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* reporting
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* @y_flip: indicates that the driver should invert Y coordinate before
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* reporting
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* @touch_stopped: touch stop flag
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*
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* Touch panel device data structure
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*/
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struct bu21013_ts {
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struct i2c_client *client;
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struct input_dev *in_dev;
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struct touchscreen_properties props;
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struct regulator *regulator;
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struct gpio_desc *cs_gpiod;
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struct gpio_desc *int_gpiod;
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u32 touch_x_max;
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u32 touch_y_max;
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bool x_flip;
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bool y_flip;
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bool touch_stopped;
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};
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static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf)
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{
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int ret, i;
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for (i = 0; i < I2C_RETRY_COUNT; i++) {
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ret = i2c_smbus_read_i2c_block_data(ts->client,
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BU21013_SENSORS_BTN_0_7_REG,
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LENGTH_OF_BUFFER, buf);
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if (ret == LENGTH_OF_BUFFER)
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return 0;
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}
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return -EINVAL;
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}
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static int bu21013_do_touch_report(struct bu21013_ts *ts)
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{
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struct input_dev *input = ts->in_dev;
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struct input_mt_pos pos[MAX_FINGERS];
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int slots[MAX_FINGERS];
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u8 buf[LENGTH_OF_BUFFER];
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bool has_x_sensors, has_y_sensors;
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int finger_down_count = 0;
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int i;
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if (bu21013_read_block_data(ts, buf) < 0)
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return -EINVAL;
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has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
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has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
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((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
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if (!has_x_sensors || !has_y_sensors)
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return 0;
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for (i = 0; i < MAX_FINGERS; i++) {
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const u8 *data = &buf[4 * i + 3];
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unsigned int x, y;
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x = data[0] << SHIFT_2 | (data[1] & MASK_BITS);
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y = data[2] << SHIFT_2 | (data[3] & MASK_BITS);
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if (x != 0 && y != 0)
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touchscreen_set_mt_pos(&pos[finger_down_count++],
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&ts->props, x, y);
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}
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if (finger_down_count == 2 &&
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(abs(pos[0].x - pos[1].x) < DELTA_MIN ||
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abs(pos[0].y - pos[1].y) < DELTA_MIN)) {
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return 0;
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}
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input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN);
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for (i = 0; i < finger_down_count; i++) {
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input_mt_slot(input, slots[i]);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
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input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
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input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
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}
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input_mt_sync_frame(input);
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input_sync(input);
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return 0;
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}
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static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
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{
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struct bu21013_ts *ts = device_data;
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int keep_polling;
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int error;
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do {
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error = bu21013_do_touch_report(ts);
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if (error) {
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dev_err(&ts->client->dev, "%s failed\n", __func__);
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break;
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}
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if (unlikely(ts->touch_stopped))
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break;
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keep_polling = ts->int_gpiod ?
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gpiod_get_value(ts->int_gpiod) : false;
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if (keep_polling)
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usleep_range(2000, 2500);
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} while (keep_polling);
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return IRQ_HANDLED;
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}
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static int bu21013_init_chip(struct bu21013_ts *ts)
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{
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struct i2c_client *client = ts->client;
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int error;
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error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG,
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BU21013_RESET_ENABLE);
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if (error) {
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dev_err(&client->dev, "BU21013_RESET reg write failed\n");
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return error;
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}
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msleep(RESET_DELAY);
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG,
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BU21013_SENSORS_EN_0_7);
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if (error) {
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dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG,
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BU21013_SENSORS_EN_8_15);
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if (error) {
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dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG,
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BU21013_SENSORS_EN_16_23);
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if (error) {
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dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG,
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BU21013_POS_MODE1_0 |
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BU21013_POS_MODE1_1);
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if (error) {
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dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG,
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BU21013_POS_MODE2_ZERO |
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BU21013_POS_MODE2_AVG1 |
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BU21013_POS_MODE2_AVG2 |
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BU21013_POS_MODE2_EN_RAW |
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BU21013_POS_MODE2_MULTI);
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if (error) {
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dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG,
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BU21013_CLK_MODE_DIV |
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BU21013_CLK_MODE_CALIB);
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if (error) {
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dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG,
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BU21013_IDLET_0 |
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BU21013_IDLE_INTERMIT_EN);
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if (error) {
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dev_err(&client->dev, "BU21013_IDLE reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG,
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BU21013_INT_MODE_LEVEL);
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if (error) {
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dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG,
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BU21013_DELTA_0_6 |
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BU21013_FILTER_EN);
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if (error) {
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dev_err(&client->dev, "BU21013_FILTER reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG,
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BU21013_TH_ON_5);
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if (error) {
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dev_err(&client->dev, "BU21013_TH_ON reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG,
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BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
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if (error) {
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dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG,
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BU21013_GAIN_0 | BU21013_GAIN_1);
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if (error) {
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dev_err(&client->dev, "BU21013_GAIN reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG,
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BU21013_OFFSET_MODE_DEFAULT);
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if (error) {
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dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG,
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BU21013_X_EDGE_0 |
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BU21013_X_EDGE_2 |
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BU21013_Y_EDGE_1 |
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BU21013_Y_EDGE_3);
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if (error) {
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dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG,
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BU21013_DONE);
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if (error) {
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dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n");
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return error;
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}
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return 0;
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}
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static void bu21013_power_off(void *_ts)
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{
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struct bu21013_ts *ts = _ts;
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regulator_disable(ts->regulator);
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}
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static void bu21013_disable_chip(void *_ts)
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{
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struct bu21013_ts *ts = _ts;
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gpiod_set_value(ts->cs_gpiod, 0);
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}
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static int bu21013_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct bu21013_ts *ts;
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struct input_dev *in_dev;
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struct input_absinfo *info;
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u32 max_x = 0, max_y = 0;
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int error;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(&client->dev, "i2c smbus byte data not supported\n");
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return -EIO;
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}
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if (!client->irq) {
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dev_err(&client->dev, "No IRQ set up\n");
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return -EINVAL;
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}
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->client = client;
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ts->x_flip = device_property_read_bool(&client->dev, "rohm,flip-x");
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ts->y_flip = device_property_read_bool(&client->dev, "rohm,flip-y");
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in_dev = devm_input_allocate_device(&client->dev);
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if (!in_dev) {
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dev_err(&client->dev, "device memory alloc failed\n");
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return -ENOMEM;
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}
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ts->in_dev = in_dev;
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input_set_drvdata(in_dev, ts);
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/* register the device to input subsystem */
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in_dev->name = DRIVER_TP;
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in_dev->id.bustype = BUS_I2C;
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device_property_read_u32(&client->dev, "rohm,touch-max-x", &max_x);
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device_property_read_u32(&client->dev, "rohm,touch-max-y", &max_y);
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input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0);
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input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
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touchscreen_parse_properties(in_dev, true, &ts->props);
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/* Adjust for the legacy "flip" properties, if present */
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if (!ts->props.invert_x &&
|
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device_property_read_bool(&client->dev, "rohm,flip-x")) {
|
|
info = &in_dev->absinfo[ABS_MT_POSITION_X];
|
|
info->maximum -= info->minimum;
|
|
info->minimum = 0;
|
|
}
|
|
|
|
if (!ts->props.invert_y &&
|
|
device_property_read_bool(&client->dev, "rohm,flip-y")) {
|
|
info = &in_dev->absinfo[ABS_MT_POSITION_Y];
|
|
info->maximum -= info->minimum;
|
|
info->minimum = 0;
|
|
}
|
|
|
|
error = input_mt_init_slots(in_dev, MAX_FINGERS,
|
|
INPUT_MT_DIRECT | INPUT_MT_TRACK |
|
|
INPUT_MT_DROP_UNUSED);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to initialize MT slots");
|
|
return error;
|
|
}
|
|
|
|
ts->regulator = devm_regulator_get(&client->dev, "avdd");
|
|
if (IS_ERR(ts->regulator)) {
|
|
dev_err(&client->dev, "regulator_get failed\n");
|
|
return PTR_ERR(ts->regulator);
|
|
}
|
|
|
|
error = regulator_enable(ts->regulator);
|
|
if (error) {
|
|
dev_err(&client->dev, "regulator enable failed\n");
|
|
return error;
|
|
}
|
|
|
|
error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to install power off handler\n");
|
|
return error;
|
|
}
|
|
|
|
/* Named "CS" on the chip, DT binding is "reset" */
|
|
ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
|
|
error = PTR_ERR_OR_ZERO(ts->cs_gpiod);
|
|
if (error) {
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(&client->dev, "failed to get CS GPIO\n");
|
|
return error;
|
|
}
|
|
gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS");
|
|
|
|
error = devm_add_action_or_reset(&client->dev,
|
|
bu21013_disable_chip, ts);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"failed to install chip disable handler\n");
|
|
return error;
|
|
}
|
|
|
|
/* Named "INT" on the chip, DT binding is "touch" */
|
|
ts->int_gpiod = devm_gpiod_get_optional(&client->dev,
|
|
"touch", GPIOD_IN);
|
|
error = PTR_ERR_OR_ZERO(ts->int_gpiod);
|
|
if (error) {
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(&client->dev, "failed to get INT GPIO\n");
|
|
return error;
|
|
}
|
|
|
|
if (ts->int_gpiod)
|
|
gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
|
|
|
|
/* configure the touch panel controller */
|
|
error = bu21013_init_chip(ts);
|
|
if (error) {
|
|
dev_err(&client->dev, "error in bu21013 config\n");
|
|
return error;
|
|
}
|
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, bu21013_gpio_irq,
|
|
IRQF_ONESHOT, DRIVER_TP, ts);
|
|
if (error) {
|
|
dev_err(&client->dev, "request irq %d failed\n",
|
|
client->irq);
|
|
return error;
|
|
}
|
|
|
|
error = input_register_device(in_dev);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to register input device\n");
|
|
return error;
|
|
}
|
|
|
|
i2c_set_clientdata(client, ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bu21013_remove(struct i2c_client *client)
|
|
{
|
|
struct bu21013_ts *ts = i2c_get_clientdata(client);
|
|
|
|
/* Make sure IRQ will exit quickly even if there is contact */
|
|
ts->touch_stopped = true;
|
|
/* The resources will be freed by devm */
|
|
}
|
|
|
|
static int __maybe_unused bu21013_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct bu21013_ts *ts = i2c_get_clientdata(client);
|
|
|
|
ts->touch_stopped = true;
|
|
mb();
|
|
disable_irq(client->irq);
|
|
|
|
if (!device_may_wakeup(&client->dev))
|
|
regulator_disable(ts->regulator);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused bu21013_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct bu21013_ts *ts = i2c_get_clientdata(client);
|
|
int error;
|
|
|
|
if (!device_may_wakeup(&client->dev)) {
|
|
error = regulator_enable(ts->regulator);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"failed to re-enable regulator when resuming\n");
|
|
return error;
|
|
}
|
|
|
|
error = bu21013_init_chip(ts);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"failed to reinitialize chip when resuming\n");
|
|
return error;
|
|
}
|
|
}
|
|
|
|
ts->touch_stopped = false;
|
|
mb();
|
|
enable_irq(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume);
|
|
|
|
static const struct i2c_device_id bu21013_id[] = {
|
|
{ DRIVER_TP, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, bu21013_id);
|
|
|
|
static struct i2c_driver bu21013_driver = {
|
|
.driver = {
|
|
.name = DRIVER_TP,
|
|
.pm = &bu21013_dev_pm_ops,
|
|
},
|
|
.probe = bu21013_probe,
|
|
.remove = bu21013_remove,
|
|
.id_table = bu21013_id,
|
|
};
|
|
|
|
module_i2c_driver(bu21013_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
|
|
MODULE_DESCRIPTION("bu21013 touch screen controller driver");
|