diff options
Diffstat (limited to 'drivers/input/touchscreen/mc13783_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/mc13783_ts.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c new file mode 100644 index 000000000000..80163f1ad9fc --- /dev/null +++ b/drivers/input/touchscreen/mc13783_ts.c @@ -0,0 +1,222 @@ +/* + * Driver for the Freescale Semiconductor MC13783 touchscreen. + * + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2009 Sascha Hauer, Pengutronix + * + * Initial development of this code was funded by + * Phytec Messtechnik GmbH, http://www.phytec.de + * + * 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, or (at your option) any later version. + * 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 program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/mfd/mc13783-private.h> +#include <linux/platform_device.h> +#include <linux/mfd/mc13783.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/input.h> +#include <linux/sched.h> +#include <linux/init.h> + +#define MC13783_TS_NAME "mc13783-ts" + +struct mc13783_ts_priv { + struct input_dev *idev; + struct mc13783 *mc13783; + struct delayed_work work; + struct workqueue_struct *workq; + unsigned int sample[4]; +}; + +#define TS_MIN 1 +#define TS_MAX 1000 + +static void mc13783_ts_handler(int irq, void *data) +{ + struct mc13783_ts_priv *priv = data; + unsigned int sts; + + mc13783_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0, &sts); + mc13783_reg_write(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0, + sts & MC13783_INT_STAT_TSI); + + if (sts & MC13783_INT_STAT_TSI) + queue_delayed_work(priv->workq, &priv->work, 0); +} + +static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv) +{ + int x, y, press = 0; + + x = (priv->sample[2] >> 2) & 0x3ff; + y = (priv->sample[3] >> 2) & 0x3ff; + + pr_debug("mc13783_ts: x: %d y: %d\n", x, y); + + if (x > TS_MIN && x < TS_MAX && y > TS_MIN && y < TS_MAX) { + press = 1; + input_report_abs(priv->idev, ABS_X, x); + input_report_abs(priv->idev, ABS_Y, y); + + queue_delayed_work(priv->workq, &priv->work, HZ / 50); + } + + input_report_key(priv->idev, BTN_TOUCH, press); + input_sync(priv->idev); +} + +static void mc13783_ts_work(struct work_struct *work) +{ + struct mc13783_ts_priv *priv = + container_of(work, struct mc13783_ts_priv, work.work); + unsigned int mode = MC13783_ADC_MODE_TS; + unsigned int channel = 12; + int ret; + + ret = mc13783_adc_do_conversion + (priv->mc13783, mode, channel, priv->sample); + + if (!ret) + mc13783_ts_report_sample(priv); +} + +static int mc13783_ts_open(struct input_dev *dev) +{ + struct mc13783_ts_priv *priv = input_get_drvdata(dev); + int ret; + + ret = mc13783_register_irq(priv->mc13783, MC13783_IRQ_TS, + mc13783_ts_handler, priv); + if (ret) + return ret; + + queue_delayed_work(priv->workq, &priv->work, HZ / 20); + + return 0; +} + +static void mc13783_ts_close(struct input_dev *dev) +{ + struct mc13783_ts_priv *priv = input_get_drvdata(dev); + + mc13783_free_irq(priv->mc13783, MC13783_IRQ_TS); +} + +static int __devinit mc13783_ts_probe(struct platform_device *pdev) +{ + struct mc13783_ts_priv *priv; + struct input_dev *idev; + int ret; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->mc13783 = dev_get_drvdata(pdev->dev.parent); + + idev = input_allocate_device(); + if (!idev) { + ret = -ENOMEM; + goto err_input_alloc; + } + + priv->idev = idev; + idev->name = MC13783_TS_NAME; + idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + idev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y); + idev->open = mc13783_ts_open; + idev->close = mc13783_ts_close; + input_set_abs_params(idev, ABS_X, TS_MIN, TS_MAX, 0, 0); + input_set_abs_params(idev, ABS_Y, TS_MIN, TS_MAX, 0, 0); + + platform_set_drvdata(pdev, priv); + + INIT_DELAYED_WORK(&priv->work, mc13783_ts_work); + + priv->workq = create_singlethread_workqueue("mc13783_ts"); + if (!priv->workq) { + ret = -ENOMEM; + goto err_input_alloc; + } + + input_set_drvdata(idev, priv); + + ret = input_register_device(priv->idev); + if (ret) { + dev_err(&pdev->dev, + "register input device failed with %d\n", ret); + goto err_failed_register; + } + + /* unmask the ts wakeup interrupt */ + mc13783_set_bits(priv->mc13783, MC13783_REG_INTERRUPT_MASK_0, + MC13783_INT_MASK_TSM, 0); + + mc13783_adc_set_ts_status(priv->mc13783, 1); + + return 0; + +err_failed_register: + input_free_device(priv->idev); +err_input_alloc: + kfree(priv); + + return ret; +} + +static int __devexit mc13783_ts_remove(struct platform_device *pdev) +{ + struct mc13783_ts_priv *priv = platform_get_drvdata(pdev); + + mc13783_adc_set_ts_status(priv->mc13783, 0); + + cancel_delayed_work(&priv->work); + destroy_workqueue(priv->workq); + + input_unregister_device(priv->idev); + + kfree(priv); + + return 0; +} + +static struct platform_driver mc13783_ts_driver = { + .remove = __devexit_p(mc13783_ts_remove), + .driver = { + .owner = THIS_MODULE, + .name = MC13783_TS_NAME, + }, +}; + +static int __init mc13783_ts_init(void) +{ + return platform_driver_probe(&mc13783_ts_driver, &mc13783_ts_probe); +} + +static void __exit mc13783_ts_exit(void) +{ + platform_driver_unregister(&mc13783_ts_driver); +} + +module_init(mc13783_ts_init); +module_exit(mc13783_ts_exit); + +MODULE_DESCRIPTION("MC13783 input touchscreen driver"); +MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mc13783-touch"); |