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242 lines
6.2 KiB
242 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for the Freescale Semiconductor MC13783 touchscreen. |
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* |
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* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. |
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* Copyright (C) 2009 Sascha Hauer, Pengutronix |
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* |
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* Initial development of this code was funded by |
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* Phytec Messtechnik GmbH, http://www.phytec.de/ |
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*/ |
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#include <linux/platform_device.h> |
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#include <linux/mfd/mc13783.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/input.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#define MC13783_TS_NAME "mc13783-ts" |
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#define DEFAULT_SAMPLE_TOLERANCE 300 |
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static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE; |
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module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(sample_tolerance, |
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"If the minimal and maximal value read out for one axis (out " |
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"of three) differ by this value (default: " |
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__stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading " |
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"is supposed to be wrong and is discarded. Set to 0 to " |
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"disable this check."); |
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struct mc13783_ts_priv { |
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struct input_dev *idev; |
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struct mc13xxx *mc13xxx; |
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struct delayed_work work; |
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unsigned int sample[4]; |
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struct mc13xxx_ts_platform_data *touch; |
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}; |
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static irqreturn_t mc13783_ts_handler(int irq, void *data) |
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{ |
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struct mc13783_ts_priv *priv = data; |
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mc13xxx_irq_ack(priv->mc13xxx, irq); |
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/* |
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* Kick off reading coordinates. Note that if work happens already |
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* be queued for future execution (it rearms itself) it will not |
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* be rescheduled for immediate execution here. However the rearm |
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* delay is HZ / 50 which is acceptable. |
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*/ |
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schedule_delayed_work(&priv->work, 0); |
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return IRQ_HANDLED; |
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} |
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#define sort3(a0, a1, a2) ({ \ |
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if (a0 > a1) \ |
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swap(a0, a1); \ |
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if (a1 > a2) \ |
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swap(a1, a2); \ |
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if (a0 > a1) \ |
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swap(a0, a1); \ |
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}) |
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static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv) |
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{ |
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struct input_dev *idev = priv->idev; |
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int x0, x1, x2, y0, y1, y2; |
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int cr0, cr1; |
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/* |
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* the values are 10-bit wide only, but the two least significant |
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* bits are for future 12 bit use and reading yields 0 |
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*/ |
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x0 = priv->sample[0] & 0xfff; |
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x1 = priv->sample[1] & 0xfff; |
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x2 = priv->sample[2] & 0xfff; |
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y0 = priv->sample[3] & 0xfff; |
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y1 = (priv->sample[0] >> 12) & 0xfff; |
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y2 = (priv->sample[1] >> 12) & 0xfff; |
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cr0 = (priv->sample[2] >> 12) & 0xfff; |
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cr1 = (priv->sample[3] >> 12) & 0xfff; |
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dev_dbg(&idev->dev, |
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"x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) cr: (% 4d, % 4d)\n", |
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x0, x1, x2, y0, y1, y2, cr0, cr1); |
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sort3(x0, x1, x2); |
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sort3(y0, y1, y2); |
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cr0 = (cr0 + cr1) / 2; |
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if (!cr0 || !sample_tolerance || |
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(x2 - x0 < sample_tolerance && |
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y2 - y0 < sample_tolerance)) { |
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/* report the median coordinate and average pressure */ |
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if (cr0) { |
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input_report_abs(idev, ABS_X, x1); |
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input_report_abs(idev, ABS_Y, y1); |
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dev_dbg(&idev->dev, "report (%d, %d, %d)\n", |
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x1, y1, 0x1000 - cr0); |
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schedule_delayed_work(&priv->work, HZ / 50); |
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} else { |
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dev_dbg(&idev->dev, "report release\n"); |
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} |
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input_report_abs(idev, ABS_PRESSURE, |
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cr0 ? 0x1000 - cr0 : cr0); |
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input_report_key(idev, BTN_TOUCH, cr0); |
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input_sync(idev); |
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} else { |
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dev_dbg(&idev->dev, "discard event\n"); |
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} |
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} |
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static void mc13783_ts_work(struct work_struct *work) |
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{ |
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struct mc13783_ts_priv *priv = |
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container_of(work, struct mc13783_ts_priv, work.work); |
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unsigned int mode = MC13XXX_ADC_MODE_TS; |
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unsigned int channel = 12; |
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if (mc13xxx_adc_do_conversion(priv->mc13xxx, |
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mode, channel, |
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priv->touch->ato, priv->touch->atox, |
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priv->sample) == 0) |
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mc13783_ts_report_sample(priv); |
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} |
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static int mc13783_ts_open(struct input_dev *dev) |
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{ |
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struct mc13783_ts_priv *priv = input_get_drvdata(dev); |
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int ret; |
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mc13xxx_lock(priv->mc13xxx); |
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mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS); |
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ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS, |
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mc13783_ts_handler, MC13783_TS_NAME, priv); |
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if (ret) |
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goto out; |
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ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, |
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MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0); |
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if (ret) |
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mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); |
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out: |
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mc13xxx_unlock(priv->mc13xxx); |
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return ret; |
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} |
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static void mc13783_ts_close(struct input_dev *dev) |
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{ |
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struct mc13783_ts_priv *priv = input_get_drvdata(dev); |
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mc13xxx_lock(priv->mc13xxx); |
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mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, |
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MC13XXX_ADC0_TSMOD_MASK, 0); |
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mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); |
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mc13xxx_unlock(priv->mc13xxx); |
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cancel_delayed_work_sync(&priv->work); |
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} |
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static int __init mc13783_ts_probe(struct platform_device *pdev) |
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{ |
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struct mc13783_ts_priv *priv; |
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struct input_dev *idev; |
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int ret = -ENOMEM; |
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priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
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idev = input_allocate_device(); |
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if (!priv || !idev) |
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goto err_free_mem; |
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INIT_DELAYED_WORK(&priv->work, mc13783_ts_work); |
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priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); |
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priv->idev = idev; |
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priv->touch = dev_get_platdata(&pdev->dev); |
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if (!priv->touch) { |
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dev_err(&pdev->dev, "missing platform data\n"); |
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ret = -ENODEV; |
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goto err_free_mem; |
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} |
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idev->name = MC13783_TS_NAME; |
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idev->dev.parent = &pdev->dev; |
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idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
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idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
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input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0); |
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input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0); |
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input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0); |
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idev->open = mc13783_ts_open; |
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idev->close = mc13783_ts_close; |
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input_set_drvdata(idev, priv); |
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ret = input_register_device(priv->idev); |
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if (ret) { |
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dev_err(&pdev->dev, |
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"register input device failed with %d\n", ret); |
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goto err_free_mem; |
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} |
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platform_set_drvdata(pdev, priv); |
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return 0; |
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err_free_mem: |
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input_free_device(idev); |
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kfree(priv); |
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return ret; |
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} |
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static int mc13783_ts_remove(struct platform_device *pdev) |
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{ |
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struct mc13783_ts_priv *priv = platform_get_drvdata(pdev); |
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input_unregister_device(priv->idev); |
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kfree(priv); |
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return 0; |
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} |
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static struct platform_driver mc13783_ts_driver = { |
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.remove = mc13783_ts_remove, |
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.driver = { |
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.name = MC13783_TS_NAME, |
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}, |
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}; |
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module_platform_driver_probe(mc13783_ts_driver, mc13783_ts_probe); |
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MODULE_DESCRIPTION("MC13783 input touchscreen driver"); |
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MODULE_AUTHOR("Sascha Hauer <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:" MC13783_TS_NAME);
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