1 files changed, 286 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/sx8654.c b/drivers/input/touchscreen/sx8654.c
new file mode 100644
index 000000000000..aecb9ad2e701
--- /dev/null
+++ b/drivers/input/touchscreen/sx8654.c
@@ -0,0 +1,286 @@
+/*
+ * 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;
+        int 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");