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