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![Hans de Goede](/assets/img/avatar_default.png)
The Silead touchscreen on the Chuwi Vi8 tablet uses MSSL0002 as ACPI HID, rather then the usual MSSL1680 id. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
638 lines
16 KiB
C
638 lines
16 KiB
C
/* -------------------------------------------------------------------------
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* Copyright (C) 2014-2015, Intel Corporation
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*
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* Derived from:
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* gslX68X.c
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* Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* -------------------------------------------------------------------------
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/delay.h>
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#include <linux/firmware.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/pm.h>
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#include <linux/irq.h>
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#include <linux/regulator/consumer.h>
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#include <asm/unaligned.h>
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#define SILEAD_TS_NAME "silead_ts"
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#define SILEAD_REG_RESET 0xE0
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#define SILEAD_REG_DATA 0x80
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#define SILEAD_REG_TOUCH_NR 0x80
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#define SILEAD_REG_POWER 0xBC
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#define SILEAD_REG_CLOCK 0xE4
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#define SILEAD_REG_STATUS 0xB0
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#define SILEAD_REG_ID 0xFC
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#define SILEAD_REG_MEM_CHECK 0xB0
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#define SILEAD_STATUS_OK 0x5A5A5A5A
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#define SILEAD_TS_DATA_LEN 44
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#define SILEAD_CLOCK 0x04
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#define SILEAD_CMD_RESET 0x88
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#define SILEAD_CMD_START 0x00
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#define SILEAD_POINT_DATA_LEN 0x04
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#define SILEAD_POINT_Y_OFF 0x00
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#define SILEAD_POINT_Y_MSB_OFF 0x01
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#define SILEAD_POINT_X_OFF 0x02
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#define SILEAD_POINT_X_MSB_OFF 0x03
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#define SILEAD_EXTRA_DATA_MASK 0xF0
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#define SILEAD_CMD_SLEEP_MIN 10000
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#define SILEAD_CMD_SLEEP_MAX 20000
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#define SILEAD_POWER_SLEEP 20
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#define SILEAD_STARTUP_SLEEP 30
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#define SILEAD_MAX_FINGERS 10
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enum silead_ts_power {
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SILEAD_POWER_ON = 1,
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SILEAD_POWER_OFF = 0
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};
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struct silead_ts_data {
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struct i2c_client *client;
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struct gpio_desc *gpio_power;
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struct input_dev *input;
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struct regulator_bulk_data regulators[2];
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char fw_name[64];
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struct touchscreen_properties prop;
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u32 max_fingers;
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u32 chip_id;
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struct input_mt_pos pos[SILEAD_MAX_FINGERS];
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int slots[SILEAD_MAX_FINGERS];
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int id[SILEAD_MAX_FINGERS];
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};
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struct silead_fw_data {
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u32 offset;
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u32 val;
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};
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static int silead_ts_request_input_dev(struct silead_ts_data *data)
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{
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struct device *dev = &data->client->dev;
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int error;
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data->input = devm_input_allocate_device(dev);
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if (!data->input) {
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dev_err(dev,
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"Failed to allocate input device\n");
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return -ENOMEM;
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}
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input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
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input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
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touchscreen_parse_properties(data->input, true, &data->prop);
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input_mt_init_slots(data->input, data->max_fingers,
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INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
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INPUT_MT_TRACK);
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if (device_property_read_bool(dev, "silead,home-button"))
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input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
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data->input->name = SILEAD_TS_NAME;
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data->input->phys = "input/ts";
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data->input->id.bustype = BUS_I2C;
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error = input_register_device(data->input);
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if (error) {
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dev_err(dev, "Failed to register input device: %d\n", error);
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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 silead_ts_set_power(struct i2c_client *client,
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enum silead_ts_power state)
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{
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struct silead_ts_data *data = i2c_get_clientdata(client);
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if (data->gpio_power) {
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gpiod_set_value_cansleep(data->gpio_power, state);
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msleep(SILEAD_POWER_SLEEP);
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}
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}
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static void silead_ts_read_data(struct i2c_client *client)
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{
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struct silead_ts_data *data = i2c_get_clientdata(client);
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struct input_dev *input = data->input;
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struct device *dev = &client->dev;
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u8 *bufp, buf[SILEAD_TS_DATA_LEN];
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int touch_nr, softbutton, error, i;
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bool softbutton_pressed = false;
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error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
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SILEAD_TS_DATA_LEN, buf);
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if (error < 0) {
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dev_err(dev, "Data read error %d\n", error);
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return;
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}
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if (buf[0] > data->max_fingers) {
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dev_warn(dev, "More touches reported then supported %d > %d\n",
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buf[0], data->max_fingers);
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buf[0] = data->max_fingers;
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}
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touch_nr = 0;
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bufp = buf + SILEAD_POINT_DATA_LEN;
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for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
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softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
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SILEAD_EXTRA_DATA_MASK) >> 4;
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if (softbutton) {
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/*
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* For now only respond to softbutton == 0x01, some
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* tablets *without* a capacative button send 0x04
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* when crossing the edges of the screen.
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*/
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if (softbutton == 0x01)
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softbutton_pressed = true;
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continue;
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}
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/*
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* Bits 4-7 are the touch id, note not all models have
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* hardware touch ids so atm we don't use these.
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*/
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data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
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SILEAD_EXTRA_DATA_MASK) >> 4;
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touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
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get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
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get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
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touch_nr++;
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}
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input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
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for (i = 0; i < touch_nr; i++) {
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input_mt_slot(input, data->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, data->pos[i].x);
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input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
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dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
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data->pos[i].y, data->id[i], data->slots[i]);
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}
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input_mt_sync_frame(input);
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input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
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input_sync(input);
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}
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static int silead_ts_init(struct i2c_client *client)
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{
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struct silead_ts_data *data = i2c_get_clientdata(client);
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int error;
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
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SILEAD_CMD_RESET);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
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data->max_fingers);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
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SILEAD_CLOCK);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
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SILEAD_CMD_START);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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return 0;
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i2c_write_err:
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dev_err(&client->dev, "Registers clear error %d\n", error);
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return error;
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}
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static int silead_ts_reset(struct i2c_client *client)
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{
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int error;
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
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SILEAD_CMD_RESET);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
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SILEAD_CLOCK);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
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SILEAD_CMD_START);
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if (error)
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goto i2c_write_err;
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usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
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return 0;
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i2c_write_err:
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dev_err(&client->dev, "Chip reset error %d\n", error);
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return error;
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}
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static int silead_ts_startup(struct i2c_client *client)
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{
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int error;
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error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
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if (error) {
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dev_err(&client->dev, "Startup error %d\n", error);
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return error;
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}
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msleep(SILEAD_STARTUP_SLEEP);
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return 0;
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}
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static int silead_ts_load_fw(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct silead_ts_data *data = i2c_get_clientdata(client);
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unsigned int fw_size, i;
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const struct firmware *fw;
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struct silead_fw_data *fw_data;
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int error;
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dev_dbg(dev, "Firmware file name: %s", data->fw_name);
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error = request_firmware(&fw, data->fw_name, dev);
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if (error) {
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dev_err(dev, "Firmware request error %d\n", error);
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return error;
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}
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fw_size = fw->size / sizeof(*fw_data);
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fw_data = (struct silead_fw_data *)fw->data;
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for (i = 0; i < fw_size; i++) {
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error = i2c_smbus_write_i2c_block_data(client,
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fw_data[i].offset,
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4,
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(u8 *)&fw_data[i].val);
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if (error) {
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dev_err(dev, "Firmware load error %d\n", error);
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break;
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}
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}
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release_firmware(fw);
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return error ?: 0;
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}
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static u32 silead_ts_get_status(struct i2c_client *client)
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{
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int error;
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__le32 status;
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error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
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sizeof(status), (u8 *)&status);
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if (error < 0) {
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dev_err(&client->dev, "Status read error %d\n", error);
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return error;
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}
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return le32_to_cpu(status);
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}
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static int silead_ts_get_id(struct i2c_client *client)
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{
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struct silead_ts_data *data = i2c_get_clientdata(client);
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__le32 chip_id;
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int error;
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error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
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sizeof(chip_id), (u8 *)&chip_id);
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if (error < 0) {
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dev_err(&client->dev, "Chip ID read error %d\n", error);
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return error;
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}
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data->chip_id = le32_to_cpu(chip_id);
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dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
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return 0;
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}
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static int silead_ts_setup(struct i2c_client *client)
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{
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int error;
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u32 status;
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silead_ts_set_power(client, SILEAD_POWER_OFF);
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silead_ts_set_power(client, SILEAD_POWER_ON);
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error = silead_ts_get_id(client);
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if (error)
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return error;
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error = silead_ts_init(client);
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if (error)
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return error;
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error = silead_ts_reset(client);
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if (error)
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return error;
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error = silead_ts_load_fw(client);
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if (error)
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return error;
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error = silead_ts_startup(client);
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if (error)
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return error;
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status = silead_ts_get_status(client);
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if (status != SILEAD_STATUS_OK) {
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dev_err(&client->dev,
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"Initialization error, status: 0x%X\n", status);
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return -ENODEV;
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}
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return 0;
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}
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static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
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{
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struct silead_ts_data *data = id;
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struct i2c_client *client = data->client;
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silead_ts_read_data(client);
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return IRQ_HANDLED;
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}
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static void silead_ts_read_props(struct i2c_client *client)
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{
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struct silead_ts_data *data = i2c_get_clientdata(client);
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struct device *dev = &client->dev;
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const char *str;
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int error;
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error = device_property_read_u32(dev, "silead,max-fingers",
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&data->max_fingers);
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if (error) {
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dev_dbg(dev, "Max fingers read error %d\n", error);
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data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
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}
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error = device_property_read_string(dev, "firmware-name", &str);
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if (!error)
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snprintf(data->fw_name, sizeof(data->fw_name),
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"silead/%s", str);
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else
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dev_dbg(dev, "Firmware file name read error. Using default.");
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}
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#ifdef CONFIG_ACPI
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static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
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const struct i2c_device_id *id)
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{
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const struct acpi_device_id *acpi_id;
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struct device *dev = &data->client->dev;
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int i;
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if (ACPI_HANDLE(dev)) {
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acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!acpi_id)
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return -ENODEV;
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snprintf(data->fw_name, sizeof(data->fw_name),
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"silead/%s.fw", acpi_id->id);
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for (i = 0; i < strlen(data->fw_name); i++)
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data->fw_name[i] = tolower(data->fw_name[i]);
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} else {
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snprintf(data->fw_name, sizeof(data->fw_name),
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"silead/%s.fw", id->name);
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}
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return 0;
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}
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#else
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static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
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const struct i2c_device_id *id)
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{
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snprintf(data->fw_name, sizeof(data->fw_name),
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"silead/%s.fw", id->name);
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return 0;
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}
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#endif
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static void silead_disable_regulator(void *arg)
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{
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struct silead_ts_data *data = arg;
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regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
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}
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static int silead_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct silead_ts_data *data;
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struct device *dev = &client->dev;
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int error;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_I2C |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK |
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I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
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dev_err(dev, "I2C functionality check failed\n");
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return -ENXIO;
|
|
}
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
data->client = client;
|
|
|
|
error = silead_ts_set_default_fw_name(data, id);
|
|
if (error)
|
|
return error;
|
|
|
|
silead_ts_read_props(client);
|
|
|
|
/* We must have the IRQ provided by DT or ACPI subsytem */
|
|
if (client->irq <= 0)
|
|
return -ENODEV;
|
|
|
|
data->regulators[0].supply = "vddio";
|
|
data->regulators[1].supply = "avdd";
|
|
error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
|
|
data->regulators);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Enable regulators at probe and disable them at remove, we need
|
|
* to keep the chip powered otherwise it forgets its firmware.
|
|
*/
|
|
error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
|
|
data->regulators);
|
|
if (error)
|
|
return error;
|
|
|
|
error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Power GPIO pin */
|
|
data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
|
|
if (IS_ERR(data->gpio_power)) {
|
|
if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
|
|
dev_err(dev, "Shutdown GPIO request failed\n");
|
|
return PTR_ERR(data->gpio_power);
|
|
}
|
|
|
|
error = silead_ts_setup(client);
|
|
if (error)
|
|
return error;
|
|
|
|
error = silead_ts_request_input_dev(data);
|
|
if (error)
|
|
return error;
|
|
|
|
error = devm_request_threaded_irq(dev, client->irq,
|
|
NULL, silead_ts_threaded_irq_handler,
|
|
IRQF_ONESHOT, client->name, data);
|
|
if (error) {
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(dev, "IRQ request failed %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused silead_ts_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
disable_irq(client->irq);
|
|
silead_ts_set_power(client, SILEAD_POWER_OFF);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused silead_ts_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int error, status;
|
|
|
|
silead_ts_set_power(client, SILEAD_POWER_ON);
|
|
|
|
error = silead_ts_reset(client);
|
|
if (error)
|
|
return error;
|
|
|
|
error = silead_ts_startup(client);
|
|
if (error)
|
|
return error;
|
|
|
|
status = silead_ts_get_status(client);
|
|
if (status != SILEAD_STATUS_OK) {
|
|
dev_err(dev, "Resume error, status: 0x%02x\n", status);
|
|
return -ENODEV;
|
|
}
|
|
|
|
enable_irq(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
|
|
|
|
static const struct i2c_device_id silead_ts_id[] = {
|
|
{ "gsl1680", 0 },
|
|
{ "gsl1688", 0 },
|
|
{ "gsl3670", 0 },
|
|
{ "gsl3675", 0 },
|
|
{ "gsl3692", 0 },
|
|
{ "mssl1680", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, silead_ts_id);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id silead_ts_acpi_match[] = {
|
|
{ "GSL1680", 0 },
|
|
{ "GSL1688", 0 },
|
|
{ "GSL3670", 0 },
|
|
{ "GSL3675", 0 },
|
|
{ "GSL3692", 0 },
|
|
{ "MSSL1680", 0 },
|
|
{ "MSSL0001", 0 },
|
|
{ "MSSL0002", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id silead_ts_of_match[] = {
|
|
{ .compatible = "silead,gsl1680" },
|
|
{ .compatible = "silead,gsl1688" },
|
|
{ .compatible = "silead,gsl3670" },
|
|
{ .compatible = "silead,gsl3675" },
|
|
{ .compatible = "silead,gsl3692" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, silead_ts_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver silead_ts_driver = {
|
|
.probe = silead_ts_probe,
|
|
.id_table = silead_ts_id,
|
|
.driver = {
|
|
.name = SILEAD_TS_NAME,
|
|
.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
|
|
.of_match_table = of_match_ptr(silead_ts_of_match),
|
|
.pm = &silead_ts_pm,
|
|
},
|
|
};
|
|
module_i2c_driver(silead_ts_driver);
|
|
|
|
MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
|
|
MODULE_DESCRIPTION("Silead I2C touchscreen driver");
|
|
MODULE_LICENSE("GPL");
|