This patch adds a driver for EETI's I2C connected touchscreens. Signed-off-by: Daniel Mack <daniel@xxxxxxxx> --- Corrected version: read from the device unconditionally in the open callback. This wakes up devices already armed for a transaction. drivers/input/touchscreen/Kconfig | 9 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/eeti_ts.c | 253 +++++++++++++++++++++++++++++++++++ 3 files changed, 263 insertions(+), 0 deletions(-) create mode 100644 drivers/input/touchscreen/eeti_ts.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index b01fd61..53edad0 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -111,6 +111,15 @@ config TOUCHSCREEN_DA9034 Say Y here to enable the support for the touchscreen found on Dialog Semiconductor DA9034 PMIC. +config TOUCHSCREEN_EETI + tristate "EETI touchscreen panel support" + depends on I2C + help + Say Y here to enable support for I2C connected EETI touch panels. + + To compile this driver as a module, choose M here: the + module will be called eeti_ts. + config TOUCHSCREEN_FUJITSU tristate "Fujitsu serial touchscreen" select SERIO diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 6700f7b..91292cf 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o obj-$(CONFIG_TOUCHSCREEN_CORGI) += corgi_ts.o obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o +obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o diff --git a/drivers/input/touchscreen/eeti_ts.c b/drivers/input/touchscreen/eeti_ts.c new file mode 100644 index 0000000..14cd33b --- /dev/null +++ b/drivers/input/touchscreen/eeti_ts.c @@ -0,0 +1,253 @@ +/* + * Touch Screen driver for EETI's I2C connected touch screen panels + * Copyright (c) 2009 Daniel Mack <daniel@xxxxxxxx> + * + * See EETI's software guide for the protocol specification: + * http://home.eeti.com.tw/web20/eg/guide.htm + * + * Based on migor_ts.c + * Copyright (c) 2008 Magnus Damm + * Copyright (c) 2007 Ujjwal Pande <ujjwal@xxxxxxxxxx> + * + * This file 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, or (at your option) any later version. + * + * This file 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/module.h> +#include <linux/kernel.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/timer.h> + +struct eeti_ts_priv { + struct i2c_client *client; + struct input_dev *input; + struct delayed_work work; + int irq; +}; + +#define REPORT_BIT_PRESSED (1 << 0) +#define REPORT_BIT_AD0 (1 << 1) +#define REPORT_BIT_AD1 (1 << 2) +#define REPORT_BIT_HAS_PRESSURE (1 << 6) +#define REPORT_RES_BITS(v) (((v) >> 1) + 11) + +static void eeti_ts_read(struct work_struct *work) +{ + char buf[6]; + unsigned int x, y, res, pressed; + struct eeti_ts_priv *priv = + container_of(work, struct eeti_ts_priv, work.work); + + i2c_master_recv(priv->client, buf, sizeof(buf)); + + /* drop non-report packets */ + if (!(buf[0] & 0x80)) + return; + + pressed = buf[0] & REPORT_BIT_PRESSED; + res = REPORT_RES_BITS(buf[0] & (REPORT_BIT_AD0 | REPORT_BIT_AD1)); + x = buf[2] | (buf[1] << 8); + y = buf[4] | (buf[3] << 8); + + /* fix the range to 11 bits */ + x >>= res - 11; + y >>= res - 11; + + if (buf[0] & REPORT_BIT_HAS_PRESSURE) + input_report_abs(priv->input, ABS_PRESSURE, buf[5]); + + input_report_key(priv->input, BTN_TOUCH, !!pressed); + input_report_abs(priv->input, ABS_X, x); + input_report_abs(priv->input, ABS_Y, y); + input_sync(priv->input); + enable_irq(priv->irq); +} + +static irqreturn_t eeti_ts_isr(int irq, void *dev_id) +{ + struct eeti_ts_priv *priv = dev_id; + + /* postpone I2C transactions as we are atomic */ + disable_irq_nosync(irq); + schedule_delayed_work(&priv->work, HZ / 100); + + return IRQ_HANDLED; +} + +static int eeti_ts_open(struct input_dev *dev) +{ + struct eeti_ts_priv *priv = input_get_drvdata(dev); + /* Read the events once to arm the IRQ */ + eeti_ts_read(&priv->work.work); + + return 0; +} + +static void eeti_ts_close(struct input_dev *dev) +{ + struct eeti_ts_priv *priv = input_get_drvdata(dev); + disable_irq(priv->irq); + cancel_delayed_work_sync(&priv->work); +} + +static int eeti_ts_probe(struct i2c_client *client, + const struct i2c_device_id *idp) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct eeti_ts_priv *priv; + struct input_dev *input; + int err = -ENOMEM; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) + return -EIO; + + /* In contrast to what's described in the datasheet, there seems + * to be no way of probing the presence of that device using I2C + * commands. So we need to blindly believe it is there, and wait + * for interrupts to occur. */ + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(&client->dev, "failed to allocate driver data\n"); + goto err0; + } + + input = input_allocate_device(); + if (!input) { + dev_err(&client->dev, "Failed to allocate input device.\n"); + goto err1; + } + + input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + + /* 11 bit axes */ + input_set_abs_params(input, ABS_X, 0, (1 << 11) - 1, 0, 0); + input_set_abs_params(input, ABS_Y, 0, (1 << 11) - 1, 0, 0); + input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0); + + input->name = client->name; + input->id.bustype = BUS_I2C; + input->dev.parent = &client->dev; + input->open = eeti_ts_open; + input->close = eeti_ts_close; + + input_set_drvdata(input, priv); + + priv->client = client; + priv->input = input; + priv->irq = client->irq; + dev_set_drvdata(&client->dev, priv); + INIT_DELAYED_WORK(&priv->work, eeti_ts_read); + + err = input_register_device(input); + if (err) + goto err1; + + err = request_irq(priv->irq, eeti_ts_isr, IRQF_TRIGGER_FALLING, + client->name, priv); + if (err) { + dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); + goto err2; + } + + /* Disable the irq for now. It will be enabled once the input device + * is opened. */ + disable_irq(priv->irq); + + device_init_wakeup(&client->dev, 1); + return 0; + +err2: + input_unregister_device(input); + input = NULL; /* so we dont try to free it below */ +err1: + input_free_device(input); + kfree(priv); +err0: + dev_set_drvdata(&client->dev, NULL); + return err; +} + +static int eeti_ts_remove(struct i2c_client *client) +{ + struct eeti_ts_priv *priv = dev_get_drvdata(&client->dev); + + free_irq(priv->irq, priv); + input_unregister_device(priv->input); + dev_set_drvdata(&client->dev, NULL); + kfree(priv); + + return 0; +} + +#ifdef CONFIG_PM +static int eeti_ts_suspend(struct i2c_client *client, pm_message_t mesg) +{ + struct eeti_ts_priv *priv = dev_get_drvdata(&client->dev); + + if (device_may_wakeup(&client->dev)) + enable_irq_wake(priv->irq); + + return 0; +} + +static int eeti_ts_resume(struct i2c_client *client) +{ + struct eeti_ts_priv *priv = dev_get_drvdata(&client->dev); + + if (device_may_wakeup(&client->dev)) + disable_irq_wake(priv->irq); + + return 0; +} +#else +#define eeti_ts_suspend NULL +#define eeti_ts_resume NULL +#endif + +static const struct i2c_device_id eeti_ts_id[] = { + { "eeti_ts", 0 }, +}; +MODULE_DEVICE_TABLE(i2c, eeti_ts); + +static struct i2c_driver eeti_ts_driver = { + .driver = { + .name = "eeti_ts", + }, + .probe = eeti_ts_probe, + .remove = eeti_ts_remove, + .suspend = eeti_ts_suspend, + .resume = eeti_ts_resume, + .id_table = eeti_ts_id, +}; + +static int __init eeti_ts_init(void) +{ + return i2c_add_driver(&eeti_ts_driver); +} + +static void __exit eeti_ts_exit(void) +{ + i2c_del_driver(&eeti_ts_driver); +} + +MODULE_DESCRIPTION("EETI Touchscreen driver"); +MODULE_AUTHOR("Daniel Mack <daniel@xxxxxxxx>"); +MODULE_LICENSE("GPL"); + +module_init(eeti_ts_init); +module_exit(eeti_ts_exit); -- 1.6.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
