287 lines
6.9 KiB
C
287 lines
6.9 KiB
C
/*
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* Driver for Semtech SX8654 I2C touchscreen controller.
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*
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* Copyright (c) 2015 Armadeus Systems
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* Sébastien Szymanski <sebastien.szymanski@armadeus.com>
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*
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* Using code from:
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* - sx865x.c
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* Copyright (c) 2013 U-MoBo Srl
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* Pierluigi Passaro <p.passaro@u-mobo.com>
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* - sx8650.c
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* Copyright (c) 2009 Wayne Roberts
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* - tsc2007.c
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* Copyright (c) 2008 Kwangwoo Lee
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* - ads7846.c
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* Copyright (c) 2005 David Brownell
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* Copyright (c) 2006 Nokia Corporation
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* - corgi_ts.c
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* Copyright (C) 2004-2005 Richard Purdie
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* - omap_ts.[hc], ads7846.h, ts_osk.c
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* Copyright (C) 2002 MontaVista Software
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2005 Dirk Behme
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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/* register addresses */
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#define I2C_REG_TOUCH0 0x00
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#define I2C_REG_TOUCH1 0x01
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#define I2C_REG_CHANMASK 0x04
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#define I2C_REG_IRQMASK 0x22
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#define I2C_REG_IRQSRC 0x23
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#define I2C_REG_SOFTRESET 0x3f
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/* commands */
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#define CMD_READ_REGISTER 0x40
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#define CMD_MANUAL 0xc0
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#define CMD_PENTRG 0xe0
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/* value for I2C_REG_SOFTRESET */
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#define SOFTRESET_VALUE 0xde
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/* bits for I2C_REG_IRQSRC */
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#define IRQ_PENTOUCH_TOUCHCONVDONE 0x08
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#define IRQ_PENRELEASE 0x04
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/* bits for RegTouch1 */
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#define CONDIRQ 0x20
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#define FILT_7SA 0x03
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/* bits for I2C_REG_CHANMASK */
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#define CONV_X 0x80
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#define CONV_Y 0x40
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/* coordinates rate: higher nibble of CTRL0 register */
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#define RATE_MANUAL 0x00
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#define RATE_5000CPS 0xf0
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/* power delay: lower nibble of CTRL0 register */
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#define POWDLY_1_1MS 0x0b
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#define MAX_12BIT ((1 << 12) - 1)
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struct sx8654 {
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struct input_dev *input;
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struct i2c_client *client;
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};
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static irqreturn_t sx8654_irq(int irq, void *handle)
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{
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struct sx8654 *sx8654 = handle;
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int irqsrc;
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u8 data[4];
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unsigned int x, y;
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int retval;
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irqsrc = i2c_smbus_read_byte_data(sx8654->client,
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CMD_READ_REGISTER | I2C_REG_IRQSRC);
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dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);
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if (irqsrc < 0)
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goto out;
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if (irqsrc & IRQ_PENRELEASE) {
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dev_dbg(&sx8654->client->dev, "pen release interrupt");
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input_report_key(sx8654->input, BTN_TOUCH, 0);
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input_sync(sx8654->input);
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}
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if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
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dev_dbg(&sx8654->client->dev, "pen touch interrupt");
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retval = i2c_master_recv(sx8654->client, data, sizeof(data));
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if (retval != sizeof(data))
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goto out;
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/* invalid data */
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if (unlikely(data[0] & 0x80 || data[2] & 0x80))
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goto out;
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x = ((data[0] & 0xf) << 8) | (data[1]);
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y = ((data[2] & 0xf) << 8) | (data[3]);
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input_report_abs(sx8654->input, ABS_X, x);
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input_report_abs(sx8654->input, ABS_Y, y);
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input_report_key(sx8654->input, BTN_TOUCH, 1);
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input_sync(sx8654->input);
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dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
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}
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out:
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return IRQ_HANDLED;
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}
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static int sx8654_open(struct input_dev *dev)
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{
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struct sx8654 *sx8654 = input_get_drvdata(dev);
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struct i2c_client *client = sx8654->client;
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int error;
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/* enable pen trigger mode */
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
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RATE_5000CPS | POWDLY_1_1MS);
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if (error) {
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dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
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return error;
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}
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error = i2c_smbus_write_byte(client, CMD_PENTRG);
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if (error) {
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dev_err(&client->dev, "writing command CMD_PENTRG failed");
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return error;
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}
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enable_irq(client->irq);
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return 0;
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}
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static void sx8654_close(struct input_dev *dev)
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{
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struct sx8654 *sx8654 = input_get_drvdata(dev);
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struct i2c_client *client = sx8654->client;
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int error;
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disable_irq(client->irq);
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/* enable manual mode mode */
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error = i2c_smbus_write_byte(client, CMD_MANUAL);
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if (error) {
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dev_err(&client->dev, "writing command CMD_MANUAL failed");
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return;
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}
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
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if (error) {
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dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
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return;
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}
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}
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static int sx8654_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct sx8654 *sx8654;
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struct input_dev *input;
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int error;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -ENXIO;
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sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
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if (!sx8654)
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return -ENOMEM;
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input = devm_input_allocate_device(&client->dev);
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if (!input)
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return -ENOMEM;
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input->name = "SX8654 I2C Touchscreen";
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input->id.bustype = BUS_I2C;
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input->dev.parent = &client->dev;
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input->open = sx8654_open;
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input->close = sx8654_close;
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__set_bit(INPUT_PROP_DIRECT, input->propbit);
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input_set_capability(input, EV_KEY, BTN_TOUCH);
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input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
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sx8654->client = client;
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sx8654->input = input;
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input_set_drvdata(sx8654->input, sx8654);
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error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
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SOFTRESET_VALUE);
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if (error) {
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dev_err(&client->dev, "writing softreset value failed");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
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CONV_X | CONV_Y);
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if (error) {
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dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
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IRQ_PENTOUCH_TOUCHCONVDONE |
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IRQ_PENRELEASE);
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if (error) {
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dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
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return error;
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}
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
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CONDIRQ | FILT_7SA);
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if (error) {
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dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, sx8654_irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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client->name, sx8654);
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if (error) {
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dev_err(&client->dev,
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"Failed to enable IRQ %d, error: %d\n",
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client->irq, error);
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return error;
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}
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/* Disable the IRQ, we'll enable it in sx8654_open() */
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disable_irq(client->irq);
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error = input_register_device(sx8654->input);
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if (error)
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return error;
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i2c_set_clientdata(client, sx8654);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id sx8654_of_match[] = {
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{ .compatible = "semtech,sx8654", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, sx8654_of_match);
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#endif
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static const struct i2c_device_id sx8654_id_table[] = {
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{ "semtech_sx8654", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
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static struct i2c_driver sx8654_driver = {
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.driver = {
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.name = "sx8654",
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.of_match_table = of_match_ptr(sx8654_of_match),
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},
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.id_table = sx8654_id_table,
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.probe = sx8654_probe,
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};
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module_i2c_driver(sx8654_driver);
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MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
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MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
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MODULE_LICENSE("GPL");
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