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Diffstat (limited to 'kernel/drivers/input/touchscreen/jornada720_ts.c')
-rw-r--r--kernel/drivers/input/touchscreen/jornada720_ts.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/kernel/drivers/input/touchscreen/jornada720_ts.c b/kernel/drivers/input/touchscreen/jornada720_ts.c
new file mode 100644
index 000000000..ea3b6a5b8
--- /dev/null
+++ b/kernel/drivers/input/touchscreen/jornada720_ts.c
@@ -0,0 +1,153 @@
+/*
+ * drivers/input/touchscreen/jornada720_ts.c
+ *
+ * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
+ *
+ * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
+ * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
+ *
+ * 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.
+ *
+ * HP Jornada 710/720/729 Touchscreen Driver
+ */
+
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/jornada720.h>
+#include <mach/irqs.h>
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
+MODULE_LICENSE("GPL v2");
+
+struct jornada_ts {
+ struct input_dev *dev;
+ int x_data[4]; /* X sample values */
+ int y_data[4]; /* Y sample values */
+};
+
+static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
+{
+ /* 3 low word X samples */
+ jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
+ jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
+ jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
+
+ /* 3 low word Y samples */
+ jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
+ jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
+ jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
+
+ /* combined x samples bits */
+ jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
+
+ /* combined y samples bits */
+ jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
+}
+
+static int jornada720_ts_average(int coords[4])
+{
+ int coord, high_bits = coords[3];
+
+ coord = coords[0] | ((high_bits & 0x03) << 8);
+ coord += coords[1] | ((high_bits & 0x0c) << 6);
+ coord += coords[2] | ((high_bits & 0x30) << 4);
+
+ return coord / 3;
+}
+
+static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
+ struct input_dev *input = jornada_ts->dev;
+ int x, y;
+
+ /* If GPIO_GPIO9 is set to high then report pen up */
+ if (GPLR & GPIO_GPIO(9)) {
+ input_report_key(input, BTN_TOUCH, 0);
+ input_sync(input);
+ } else {
+ jornada_ssp_start();
+
+ /* proper reply to request is always TXDUMMY */
+ if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
+ jornada720_ts_collect_data(jornada_ts);
+
+ x = jornada720_ts_average(jornada_ts->x_data);
+ y = jornada720_ts_average(jornada_ts->y_data);
+
+ input_report_key(input, BTN_TOUCH, 1);
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+ input_sync(input);
+ }
+
+ jornada_ssp_end();
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int jornada720_ts_probe(struct platform_device *pdev)
+{
+ struct jornada_ts *jornada_ts;
+ struct input_dev *input_dev;
+ int error;
+
+ jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
+ if (!jornada_ts)
+ return -ENOMEM;
+
+ input_dev = devm_input_allocate_device(&pdev->dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, jornada_ts);
+
+ jornada_ts->dev = input_dev;
+
+ input_dev->name = "HP Jornada 7xx Touchscreen";
+ input_dev->phys = "jornadats/input0";
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->dev.parent = &pdev->dev;
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+ input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
+
+ error = devm_request_irq(&pdev->dev, IRQ_GPIO9,
+ jornada720_ts_interrupt,
+ IRQF_TRIGGER_RISING,
+ "HP7XX Touchscreen driver", pdev);
+ if (error) {
+ dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
+ return error;
+ }
+
+ error = input_register_device(jornada_ts->dev);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:jornada_ts");
+
+static struct platform_driver jornada720_ts_driver = {
+ .probe = jornada720_ts_probe,
+ .driver = {
+ .name = "jornada_ts",
+ },
+};
+module_platform_driver(jornada720_ts_driver);