Input: add driver for pixcir i2c touchscreens
authorJianchun Bian <jcbian@pixcir.com.cn>
Fri, 30 Dec 2011 23:16:21 +0000 (15:16 -0800)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Fri, 30 Dec 2011 23:25:52 +0000 (15:25 -0800)
This patch adds a driver for PIXCIR's I2C connected touchscreens.

Signed-off-by: Jianchun <jcbian@pixcir.com.cn>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
drivers/input/touchscreen/Kconfig
drivers/input/touchscreen/Makefile
drivers/input/touchscreen/pixcir_i2c_ts.c [new file with mode: 0644]
include/linux/input/pixcir_ts.h [new file with mode: 0644]

index a121e36e5a47fec8a79db8d6475ff2819e2e4192..4af2a18eb3ba9013332de2c961a3076fe28e1d22 100644 (file)
@@ -458,6 +458,18 @@ config TOUCHSCREEN_UCB1400
          To compile this driver as a module, choose M here: the
          module will be called ucb1400_ts.
 
+config TOUCHSCREEN_PIXCIR
+       tristate "PIXCIR I2C touchscreens"
+       depends on I2C
+       help
+         Say Y here if you have a pixcir i2c touchscreen
+         controller.
+
+         If unsure, say N.
+
+         To compile this driver as a module, choose M here: the
+         module will be called pixcir_i2c_ts.
+
 config TOUCHSCREEN_WM831X
        tristate "Support for WM831x touchscreen controllers"
        depends on MFD_WM831X
index f0b4d16d39a6604dba9df51f523f9faa52331feb..496091e884603428da438e7d0cd9d72b27c6f497 100644 (file)
@@ -41,6 +41,7 @@ obj-$(CONFIG_TOUCHSCREEN_HTCPEN)      += htcpen.o
 obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE)        += usbtouchscreen.o
 obj-$(CONFIG_TOUCHSCREEN_PCAP)         += pcap_ts.o
 obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)     += penmount.o
+obj-$(CONFIG_TOUCHSCREEN_PIXCIR)       += pixcir_i2c_ts.o
 obj-$(CONFIG_TOUCHSCREEN_S3C2410)      += s3c2410_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ST1232)       += st1232.o
 obj-$(CONFIG_TOUCHSCREEN_STMPE)                += stmpe-ts.o
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
new file mode 100644 (file)
index 0000000..d5ac09a
--- /dev/null
@@ -0,0 +1,239 @@
+/*
+ * Driver for Pixcir I2C touchscreen controllers.
+ *
+ * Copyright (C) 2010-2011 Pixcir, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/pixcir_ts.h>
+
+struct pixcir_i2c_ts_data {
+       struct i2c_client *client;
+       struct input_dev *input;
+       const struct pixcir_ts_platform_data *chip;
+       bool exiting;
+};
+
+static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
+{
+       struct pixcir_i2c_ts_data *tsdata = data;
+       u8 rdbuf[10], wrbuf[1] = { 0 };
+       u8 touch;
+       int ret;
+
+       ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
+       if (ret != sizeof(wrbuf)) {
+               dev_err(&tsdata->client->dev,
+                       "%s: i2c_master_send failed(), ret=%d\n",
+                       __func__, ret);
+               return;
+       }
+
+       ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
+       if (ret != sizeof(rdbuf)) {
+               dev_err(&tsdata->client->dev,
+                       "%s: i2c_master_recv failed(), ret=%d\n",
+                       __func__, ret);
+               return;
+       }
+
+       touch = rdbuf[0];
+       if (touch) {
+               u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
+               u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
+               u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
+               u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];
+
+               input_report_key(tsdata->input, BTN_TOUCH, 1);
+               input_report_abs(tsdata->input, ABS_X, posx1);
+               input_report_abs(tsdata->input, ABS_Y, posy1);
+
+               input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
+               input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
+               input_mt_sync(tsdata->input);
+
+               if (touch == 2) {
+                       input_report_abs(tsdata->input,
+                                        ABS_MT_POSITION_X, posx2);
+                       input_report_abs(tsdata->input,
+                                        ABS_MT_POSITION_Y, posy2);
+                       input_mt_sync(tsdata->input);
+               }
+       } else {
+               input_report_key(tsdata->input, BTN_TOUCH, 0);
+       }
+
+       input_sync(tsdata->input);
+}
+
+static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
+{
+       struct pixcir_i2c_ts_data *tsdata = dev_id;
+
+       while (!tsdata->exiting) {
+               pixcir_ts_poscheck(tsdata);
+
+               if (tsdata->chip->attb_read_val())
+                       break;
+
+               msleep(20);
+       }
+
+       return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pixcir_i2c_ts_suspend(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+
+       if (device_may_wakeup(&client->dev))
+               enable_irq_wake(client->irq);
+
+       return 0;
+}
+
+static int pixcir_i2c_ts_resume(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+
+       if (device_may_wakeup(&client->dev))
+               disable_irq_wake(client->irq);
+
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
+                        pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
+
+static int __devinit pixcir_i2c_ts_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+       const struct pixcir_ts_platform_data *pdata = client->dev.platform_data;
+       struct pixcir_i2c_ts_data *tsdata;
+       struct input_dev *input;
+       int error;
+
+       if (!pdata) {
+               dev_err(&client->dev, "platform data not defined\n");
+               return -EINVAL;
+       }
+
+       tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
+       input = input_allocate_device();
+       if (!tsdata || !input) {
+               dev_err(&client->dev, "Failed to allocate driver data!\n");
+               error = -ENOMEM;
+               goto err_free_mem;
+       }
+
+       tsdata->client = client;
+       tsdata->input = input;
+       tsdata->chip = pdata;
+
+       input->name = client->name;
+       input->id.bustype = BUS_I2C;
+       input->dev.parent = &client->dev;
+
+       __set_bit(EV_KEY, input->evbit);
+       __set_bit(EV_ABS, input->evbit);
+       __set_bit(BTN_TOUCH, input->keybit);
+       input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
+       input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
+       input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
+       input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
+
+       input_set_drvdata(input, tsdata);
+
+       error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr,
+                                    IRQF_TRIGGER_FALLING,
+                                    client->name, tsdata);
+       if (error) {
+               dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+               goto err_free_mem;
+       }
+
+       error = input_register_device(input);
+       if (error)
+               goto err_free_irq;
+
+       i2c_set_clientdata(client, tsdata);
+       device_init_wakeup(&client->dev, 1);
+
+       return 0;
+
+err_free_irq:
+       free_irq(client->irq, tsdata);
+err_free_mem:
+       input_free_device(input);
+       kfree(tsdata);
+       return error;
+}
+
+static int __devexit pixcir_i2c_ts_remove(struct i2c_client *client)
+{
+       struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);
+
+       device_init_wakeup(&client->dev, 0);
+
+       tsdata->exiting = true;
+       mb();
+       free_irq(client->irq, tsdata);
+
+       input_unregister_device(tsdata->input);
+       kfree(tsdata);
+
+       return 0;
+}
+
+static const struct i2c_device_id pixcir_i2c_ts_id[] = {
+       { "pixcir_ts", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
+
+static struct i2c_driver pixcir_i2c_ts_driver = {
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "pixcir_ts",
+               .pm     = &pixcir_dev_pm_ops,
+       },
+       .probe          = pixcir_i2c_ts_probe,
+       .remove         = __devexit_p(pixcir_i2c_ts_remove),
+       .id_table       = pixcir_i2c_ts_id,
+};
+
+static int __init pixcir_i2c_ts_init(void)
+{
+       return i2c_add_driver(&pixcir_i2c_ts_driver);
+}
+module_init(pixcir_i2c_ts_init);
+
+static void __exit pixcir_i2c_ts_exit(void)
+{
+       i2c_del_driver(&pixcir_i2c_ts_driver);
+}
+module_exit(pixcir_i2c_ts_exit);
+
+MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
+MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
new file mode 100644 (file)
index 0000000..7163d91
--- /dev/null
@@ -0,0 +1,10 @@
+#ifndef        _PIXCIR_I2C_TS_H
+#define        _PIXCIR_I2C_TS_H
+
+struct pixcir_ts_platform_data {
+       int (*attb_read_val)(void);
+       int x_max;
+       int y_max;
+};
+
+#endif