From 19722d4d90e711d7826ec7f6461216aa61f2f937 Mon Sep 17 00:00:00 2001 From: Dominik Sliwa Date: Tue, 9 Aug 2016 13:43:10 +0200 Subject: apalis_tk1: Support for K20 based MFD On Apalis TK1 boards K20 MCU is used for CAN, GPIO, ADC and touch screen. This patch includes support for core MFD device, GPIO, ADC and touch screen. Signed-off-by: Dominik Sliwa Acked-by: Marcel Ziswiler --- drivers/input/touchscreen/apalis-tk1-k20_ts.c | 230 ++++++++++++++++++++++++++ 1 file changed, 230 insertions(+) create mode 100644 drivers/input/touchscreen/apalis-tk1-k20_ts.c (limited to 'drivers/input/touchscreen/apalis-tk1-k20_ts.c') diff --git a/drivers/input/touchscreen/apalis-tk1-k20_ts.c b/drivers/input/touchscreen/apalis-tk1-k20_ts.c new file mode 100644 index 000000000000..f1fd11e87468 --- /dev/null +++ b/drivers/input/touchscreen/apalis-tk1-k20_ts.c @@ -0,0 +1,230 @@ +/* + * Copyright 2016 Toradex AG + * Dominik Sliwa + * + * Based on driver for the Freescale Semiconductor MC13783 touchscreen by: + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2009 Sascha Hauer, Pengutronix + * + * 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. + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define APALIS_TK1_K20_TS_NAME "apalis-tk1-k20-ts" + +struct apalis_tk1_k20_ts { + struct input_dev *idev; + struct apalis_tk1_k20_regmap *apalis_tk1_k20; + struct delayed_work work; + struct workqueue_struct *workq; + uint16_t sample[4]; +}; + +static irqreturn_t apalis_tk1_k20_ts_handler(int irq, void *data) +{ + struct apalis_tk1_k20_ts *priv = data; + + /* + * Kick off reading coordinates. Note that if work happens already + * be queued for future execution (it rearms itself) it will not + * be rescheduled for immediate execution here. However the rearm + * delay is HZ / 50 which is acceptable. + */ + queue_delayed_work(priv->workq, &priv->work, 0); + + return IRQ_HANDLED; +} + +static void apalis_tk1_k20_ts_report_sample(struct apalis_tk1_k20_ts *priv) +{ + struct input_dev *idev = priv->idev; + int xp, xm, yp, ym; + int x, y, press; + + xp = priv->sample[1]; + xm = priv->sample[0]; + yp = priv->sample[3]; + ym = priv->sample[2]; + + x = (xp + xm) / 2; + y = (yp + ym) / 2; + press = (abs(yp - ym) + abs(xp - xm)) / 2; + + if (press) { + input_report_abs(idev, ABS_X, x); + input_report_abs(idev, ABS_Y, y); + + dev_dbg(&idev->dev, "report (%d, %d, %d)\n", + x, y, press); + queue_delayed_work(priv->workq, &priv->work, HZ / 50); + } else + dev_dbg(&idev->dev, "report release\n"); + + input_report_abs(idev, ABS_PRESSURE, press); + input_report_key(idev, BTN_TOUCH, press); + input_sync(idev); +} + +static void apalis_tk1_k20_ts_work(struct work_struct *work) +{ + struct apalis_tk1_k20_ts *priv = + container_of(work, struct apalis_tk1_k20_ts, work.work); + uint8_t buf[8], i; + + apalis_tk1_k20_lock(priv->apalis_tk1_k20); + + if (apalis_tk1_k20_reg_read_bulk(priv->apalis_tk1_k20, + APALIS_TK1_K20_TSC_XML, buf, 8) < 0) { + apalis_tk1_k20_unlock(priv->apalis_tk1_k20); + dev_err(&priv->idev->dev, "Error reading data\n"); + return; + } + + apalis_tk1_k20_unlock(priv->apalis_tk1_k20); + + for (i = 0; i < 7; i++) + priv->sample[(int)i/2] = (buf[i+1] << 8) + buf[i]; + + apalis_tk1_k20_ts_report_sample(priv); +} + +static int apalis_tk1_k20_ts_open(struct input_dev *dev) +{ + struct apalis_tk1_k20_ts *priv = input_get_drvdata(dev); + int ret; + + apalis_tk1_k20_lock(priv->apalis_tk1_k20); + + ret = apalis_tk1_k20_irq_request(priv->apalis_tk1_k20, + APALIS_TK1_K20_TSC_IRQ, apalis_tk1_k20_ts_handler, + APALIS_TK1_K20_TS_NAME, priv); + if (ret) + goto out; + + ret = apalis_tk1_k20_reg_rmw(priv->apalis_tk1_k20, + APALIS_TK1_K20_TSCREG, APALIS_TK1_K20_TSC_ENA_MASK, + APALIS_TK1_K20_TSC_ENA); + if (ret) + apalis_tk1_k20_irq_free(priv->apalis_tk1_k20, + APALIS_TK1_K20_TSC_IRQ, priv); + +out: + apalis_tk1_k20_unlock(priv->apalis_tk1_k20); + + return ret; +} + +static void apalis_tk1_k20_ts_close(struct input_dev *dev) +{ + struct apalis_tk1_k20_ts *priv = input_get_drvdata(dev); + + apalis_tk1_k20_lock(priv->apalis_tk1_k20); + + apalis_tk1_k20_reg_rmw(priv->apalis_tk1_k20, APALIS_TK1_K20_TSCREG, + APALIS_TK1_K20_TSC_ENA_MASK, 0); + apalis_tk1_k20_irq_free(priv->apalis_tk1_k20, APALIS_TK1_K20_TSC_IRQ, + priv); + + apalis_tk1_k20_unlock(priv->apalis_tk1_k20); + + cancel_delayed_work_sync(&priv->work); +} + +static int __init apalis_tk1_k20_ts_probe(struct platform_device *pdev) +{ + struct apalis_tk1_k20_ts *priv; + struct input_dev *idev; + int ret = -ENOMEM; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + idev = input_allocate_device(); + if (!priv || !idev) + goto err_free_mem; + + INIT_DELAYED_WORK(&priv->work, apalis_tk1_k20_ts_work); + + priv->apalis_tk1_k20 = dev_get_drvdata(pdev->dev.parent); + priv->idev = idev; + + priv->workq = create_singlethread_workqueue("apalis_tk1_k20_ts"); + if (!priv->workq) + goto err_free_mem; + + idev->name = APALIS_TK1_K20_TS_NAME; + idev->dev.parent = &pdev->dev; + + idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + input_set_abs_params(idev, ABS_X, 0, 0xffff, 0, 0); + input_set_abs_params(idev, ABS_Y, 0, 0xffff, 0, 0); + input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0); + + idev->open = apalis_tk1_k20_ts_open; + idev->close = apalis_tk1_k20_ts_close; + + 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_destroy_wq; + } + + platform_set_drvdata(pdev, priv); + + return 0; + +err_destroy_wq: + destroy_workqueue(priv->workq); +err_free_mem: + input_free_device(idev); + kfree(priv); + + return ret; +} + +static int __exit apalis_tk1_k20_ts_remove(struct platform_device *pdev) +{ + struct apalis_tk1_k20_ts *priv = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + + destroy_workqueue(priv->workq); + input_unregister_device(priv->idev); + kfree(priv); + + return 0; +} + +static const struct platform_device_id apalis_tk1_k20_ts_idtable[] = { + { + .name = "apalis-tk1-k20-ts", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, apalis_tk1_k20_ts_idtable); + +static struct platform_driver apalis_tk1_k20_ts_driver = { + .id_table = apalis_tk1_k20_ts_idtable, + .remove = __exit_p(apalis_tk1_k20_ts_remove), + .driver = { + .owner = THIS_MODULE, + .name = APALIS_TK1_K20_TS_NAME, + }, +}; + +module_platform_driver_probe(apalis_tk1_k20_ts_driver, &apalis_tk1_k20_ts_probe); + +MODULE_DESCRIPTION("K20 touchscreen controller on Apalis TK1"); +MODULE_AUTHOR("Dominik Sliwa "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3