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Message-Id: <1302105142-12242-1-git-send-email-kzjeef@gmail.com>
Date: Wed, 6 Apr 2011 23:52:22 +0800
From: Jiejing Zhang <kzjeef@...il.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Eric Miao <eric.y.miao@...il.com>, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: kzjeef@...il.com, Zhang Jiejing <jiejing.zhang@...escale.com>
Subject: [PATCH] input: add maxim max11801 resistance touchscreen controller driver.
From: Zhang Jiejing <jiejing.zhang@...escale.com>
Add MAXI max11801 resistance touch screen controller driver,
This driver use Auto Mode and Aperture Mode.
Other max1180x driver can support in this driver, they use
almost same register address and define, you can find a table in
max11801_ts.c
You can find data sheet under this link:
http://www.maxim-ic.com/datasheet/index.mvp/id/5943
Signed-off-by: Zhang Jiejing <jiejing.zhang@...escale.com>
---
drivers/input/touchscreen/Kconfig | 12 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/max11801_ts.c | 293 +++++++++++++++++++++++++++++++
3 files changed, 306 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/max11801_ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 434fd80..a1067af 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -714,4 +714,16 @@ config TOUCHSCREEN_TPS6507X
To compile this driver as a module, choose M here: the
module will be called tps6507x_ts.
+config TOUCHSCREEN_MAX11801
+ tristate "MAX11801 based touchscreens"
+ depends on I2C
+ help
+ Say Y here if you have a MAX11801 based touchscreen
+ controller
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called max11801_ts
+
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index ca94098..d2302f9 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
+obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
diff --git a/drivers/input/touchscreen/max11801_ts.c b/drivers/input/touchscreen/max11801_ts.c
new file mode 100644
index 0000000..cdbd3c6
--- /dev/null
+++ b/drivers/input/touchscreen/max11801_ts.c
@@ -0,0 +1,293 @@
+/*
+ * max11801_ts.c - Driver for MAXI MAX11801 - A Resistive touch screen
+ * controller with i2c interface
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc.
+ * Author: Zhang Jiejing <jiejing.zhang@...escale.com>
+ *
+ * Based on mcs5000_ts.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+/* This driver is aim for support the serial of MAXI touch chips
+ * max11801-max11803, the main different of this 4 chips can get from
+ * this table
+ * -----------------------------------------------------
+ * | CHIP | AUTO MODE SUPPORT(FIFO) | INTERFACE |
+ * |----------------------------------------------------|
+ * | max11800 | YES | SPI |
+ * | max11801 | YES | I2C |
+ * | max11802 | NO | SPI |
+ * | max11803 | NO | I2C |
+ * ------------------------------------------------------
+ *
+ * Currently, this driver only support max11801.
+ *
+ * Data Sheet:
+ * http://www.maxim-ic.com/datasheet/index.mvp/id/5943
+ * */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+/* Register Address define */
+#define GENERNAL_STATUS_REG 0x00
+#define GENERNAL_CONF_REG 0x01
+#define MESURE_RES_CONF_REG 0x02
+#define MESURE_AVER_CONF_REG 0x03
+#define ADC_SAMPLE_TIME_CONF_REG 0x04
+#define PANEL_SETUPTIME_CONF_REG 0x05
+#define DELAY_CONVERSION_CONF_REG 0x06
+#define TOUCH_DETECT_PULLUP_CONF_REG 0x07
+#define AUTO_MODE_TIME_CONF_REG 0x08 /* only for max11800/max11801 */
+#define APERTURE_CONF_REG 0x09 /* only for max11800/max11801 */
+#define AUX_MESURE_CONF_REG 0x0a
+#define OP_MODE_CONF_REG 0x0b
+
+/* FIFO is only in max11800 & max11801 */
+#define FIFO_RD_CMD (0x50 << 1)
+#define MAX11801_FIFO_INT (1 << 2)
+#define MAX11801_FIFO_OVERFLOW (1 << 3)
+
+#define XY_BUFSIZE 4
+#define XY_BUF_OFFSET 4
+
+#define MAX11801_MAX_X 0xfff
+#define MAX11801_MAX_Y 0xfff
+
+#define MEASURE_TAG_OFFSET 2
+#define MEASURE_TAG_MASK (3 << MEASURE_TAG_OFFSET)
+#define EVENT_TAG_OFFSET 0
+#define EVENT_TAG_MASK (3 << EVENT_TAG_OFFSET)
+#define MEASURE_X_TAG (0 << MEASURE_TAG_OFFSET)
+#define MEASURE_Y_TAG (1 << MEASURE_TAG_OFFSET)
+
+/* These are the state of touch event state machine */
+enum {
+ EVENT_INIT,
+ EVENT_MIDDLE,
+ EVENT_RELEASE,
+ EVENT_FIFO_END
+};
+
+struct max11801_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct delayed_work work;
+ struct workqueue_struct *workq;
+};
+
+static u8 read_register(struct i2c_client *client, int addr)
+{
+ /* XXX: The chip ignore LSB of register address */
+ return i2c_smbus_read_byte_data(client, addr << 1);
+}
+
+static int max11801_write_reg(struct i2c_client *client, int addr, int data)
+{
+ /* XXX: The chip ignore LSB of register address */
+ return i2c_smbus_write_byte_data(client, addr << 1, data);
+}
+
+static void max11801_ts_work(struct work_struct *work)
+{
+ struct max11801_data *data = container_of(to_delayed_work(work),
+ struct max11801_data, work);
+ struct i2c_client *client = data->client;
+ int status, i, ret;
+ u8 buf[XY_BUFSIZE];
+ int x = -1;
+ int y = -1;
+
+ status = read_register(data->client, GENERNAL_STATUS_REG);
+ while (status & (MAX11801_FIFO_INT | MAX11801_FIFO_OVERFLOW)) {
+ status = read_register(data->client, GENERNAL_STATUS_REG);
+
+ ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD,
+ XY_BUFSIZE, buf);
+
+ /* We will get 4 bytes buffer that contains X,Y and event tag */
+ if (ret < XY_BUFSIZE)
+ continue;
+
+ for (i = 0; i < XY_BUFSIZE; i += XY_BUFSIZE / 2) {
+ if ((buf[i+1] & MEASURE_TAG_MASK) == MEASURE_X_TAG)
+ x = (buf[i] << XY_BUF_OFFSET) + (buf[i+1] >> XY_BUF_OFFSET);
+ else if ((buf[i+1] & MEASURE_TAG_MASK) == MEASURE_Y_TAG)
+ y = (buf[i] << XY_BUF_OFFSET) + (buf[i+1] >> XY_BUF_OFFSET);
+ }
+
+ if ((buf[1] & EVENT_TAG_MASK) != (buf[3] & EVENT_TAG_MASK))
+ continue;
+
+ switch (buf[1] & EVENT_TAG_MASK) { /* What status of current p */
+ case EVENT_INIT:
+ case EVENT_MIDDLE:
+ input_report_abs(data->input_dev, ABS_X, x);
+ input_report_abs(data->input_dev, ABS_Y, y);
+ input_report_abs(data->input_dev, ABS_PRESSURE, 1);
+ input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1);
+ input_sync(data->input_dev);
+ break;
+ case EVENT_RELEASE:
+ input_report_abs(data->input_dev, ABS_PRESSURE, 0);
+ input_event(data->input_dev, EV_KEY, BTN_TOUCH, 0);
+ input_sync(data->input_dev);
+ break;
+ case EVENT_FIFO_END:
+ break;
+ }
+ }
+ enable_irq(client->irq);
+}
+
+static void max11801_ts_phy_init(struct max11801_data *data)
+{
+ struct i2c_client *client = data->client;
+
+ /* Average X,Y, take 16 samples, average eight media sample */
+ max11801_write_reg(client, MESURE_AVER_CONF_REG, 0xff);
+ /* X,Y panel setup time set to 20us */
+ max11801_write_reg(client, PANEL_SETUPTIME_CONF_REG, 0x11);
+ /* Rough pullup time (2uS), Fine pullup time (10us) */
+ max11801_write_reg(client, TOUCH_DETECT_PULLUP_CONF_REG, 0x10);
+ /* Auto mode init period = 5ms , scan period = 5ms*/
+ max11801_write_reg(client, AUTO_MODE_TIME_CONF_REG, 0xaa);
+ /* Aperture X,Y set to +- 4LSB */
+ max11801_write_reg(client, APERTURE_CONF_REG, 0x33);
+ /* Enable Power, enable Automode, enable Aperture, enable Average X,Y */
+ max11801_write_reg(client, OP_MODE_CONF_REG, 0x36);
+}
+
+static irqreturn_t max11801_irq(int irq, void *dev)
+{
+ struct max11801_data *data = dev;
+ disable_irq_nosync(irq);
+ queue_delayed_work(data->workq, &data->work, 0);
+ return IRQ_HANDLED;
+}
+
+static int __devinit max11801_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max11801_data *data;
+ struct input_dev *input_dev;
+ int ret;
+
+ data = kzalloc(sizeof(struct max11801_data), GFP_KERNEL);
+ if (!data) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ ret = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ data->client = client;
+ data->input_dev = input_dev;
+ max11801_ts_phy_init(data);
+ INIT_DELAYED_WORK(&data->work, max11801_ts_work);
+ data->workq = create_singlethread_workqueue("max11801_ts");
+ if (!data->workq) {
+ dev_err(&client->dev, "Failed to create workqueue\n");
+ ret = -ENOMEM;
+ goto err_free_wq;
+ }
+
+ input_dev->name = "max11801_ts";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+ __set_bit(ABS_X, input_dev->absbit);
+ __set_bit(ABS_Y, input_dev->absbit);
+ __set_bit(ABS_PRESSURE, input_dev->absbit);
+ input_set_abs_params(input_dev, ABS_X, 0, MAX11801_MAX_X, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_Y, 0, 0);
+ input_set_drvdata(input_dev, data);
+
+ ret = request_irq(client->irq, max11801_irq,
+ IRQF_TRIGGER_LOW, "max11801_ts", data);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ goto err_free_dev;
+ }
+
+ ret = input_register_device(data->input_dev);
+ if (ret < 0)
+ goto err_free_irq;
+ i2c_set_clientdata(client, data);
+ return 0;
+
+err_free_irq:
+ free_irq(client->irq, data);
+err_free_wq:
+ destroy_workqueue(data->workq);
+err_free_dev:
+ input_free_device(input_dev);
+err_free_mem:
+ kfree(data);
+ return ret;
+}
+
+static __devexit int max11801_ts_remove(struct i2c_client *client)
+{
+ struct max11801_data *data = i2c_get_clientdata(client);
+
+ free_irq(client->irq, data);
+ cancel_delayed_work_sync(&data->work);
+ destroy_workqueue(data->workq);
+ input_unregister_device(data->input_dev);
+ input_free_device(data->input_dev);
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id max11801_ts_id[] = {
+ {"max11801", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max11801_ts_id);
+
+static struct i2c_driver max11801_ts_driver = {
+ .probe = max11801_ts_probe,
+ .remove = __devexit_p(max11801_ts_remove),
+ .driver = {
+ .name = "max11801_ts",
+ },
+ .id_table = max11801_ts_id,
+};
+
+static int __init max11801_ts_init(void)
+{
+ return i2c_add_driver(&max11801_ts_driver);
+}
+
+static void __exit max11801_ts_exit(void)
+{
+ i2c_del_driver(&max11801_ts_driver);
+}
+
+module_init(max11801_ts_init);
+module_exit(max11801_ts_exit);
+
+MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@...escale.com>");
+MODULE_DESCRIPTION("Touchscreen driver for MAXI MAX11801 controller");
+MODULE_LICENSE("GPL");
--
1.7.1
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