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![Fabio Estevam](/assets/img/avatar_default.png)
Adopt the SPDX license identifier headers to ease license compliance management. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
592 lines
15 KiB
C
592 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
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// Based on driver from 2011:
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// Juergen Beisert, Pengutronix <kernel@pengutronix.de>
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//
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// This is the driver for the imx25 TCQ (Touchscreen Conversion Queue)
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// connected to the imx25 ADC.
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/imx25-tsadc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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static const char mx25_tcq_name[] = "mx25-tcq";
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enum mx25_tcq_mode {
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MX25_TS_4WIRE,
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};
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struct mx25_tcq_priv {
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struct regmap *regs;
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struct regmap *core_regs;
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struct input_dev *idev;
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enum mx25_tcq_mode mode;
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unsigned int pen_threshold;
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unsigned int sample_count;
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unsigned int expected_samples;
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unsigned int pen_debounce;
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unsigned int settling_time;
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struct clk *clk;
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int irq;
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struct device *dev;
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};
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static struct regmap_config mx25_tcq_regconfig = {
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.fast_io = true,
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.max_register = 0x5c,
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static const struct of_device_id mx25_tcq_ids[] = {
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{ .compatible = "fsl,imx25-tcq", },
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mx25_tcq_ids);
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#define TSC_4WIRE_PRE_INDEX 0
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#define TSC_4WIRE_X_INDEX 1
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#define TSC_4WIRE_Y_INDEX 2
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#define TSC_4WIRE_POST_INDEX 3
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#define TSC_4WIRE_LEAVE 4
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#define MX25_TSC_DEF_THRESHOLD 80
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#define TSC_MAX_SAMPLES 16
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#define MX25_TSC_REPEAT_WAIT 14
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enum mx25_adc_configurations {
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MX25_CFG_PRECHARGE = 0,
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MX25_CFG_TOUCH_DETECT,
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MX25_CFG_X_MEASUREMENT,
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MX25_CFG_Y_MEASUREMENT,
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};
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#define MX25_PRECHARGE_VALUE (\
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MX25_ADCQ_CFG_YPLL_OFF | \
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MX25_ADCQ_CFG_XNUR_OFF | \
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MX25_ADCQ_CFG_XPUL_HIGH | \
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MX25_ADCQ_CFG_REFP_INT | \
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MX25_ADCQ_CFG_IN_XP | \
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MX25_ADCQ_CFG_REFN_NGND2 | \
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MX25_ADCQ_CFG_IGS)
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#define MX25_TOUCH_DETECT_VALUE (\
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MX25_ADCQ_CFG_YNLR | \
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MX25_ADCQ_CFG_YPLL_OFF | \
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MX25_ADCQ_CFG_XNUR_OFF | \
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MX25_ADCQ_CFG_XPUL_OFF | \
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MX25_ADCQ_CFG_REFP_INT | \
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MX25_ADCQ_CFG_IN_XP | \
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MX25_ADCQ_CFG_REFN_NGND2 | \
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MX25_ADCQ_CFG_PENIACK)
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static void imx25_setup_queue_cfgs(struct mx25_tcq_priv *priv,
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unsigned int settling_cnt)
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{
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u32 precharge_cfg =
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MX25_PRECHARGE_VALUE |
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MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt);
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u32 touch_detect_cfg =
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MX25_TOUCH_DETECT_VALUE |
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MX25_ADCQ_CFG_NOS(1) |
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MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt);
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regmap_write(priv->core_regs, MX25_TSC_TICR, precharge_cfg);
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/* PRECHARGE */
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regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_PRECHARGE),
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precharge_cfg);
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/* TOUCH_DETECT */
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regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_TOUCH_DETECT),
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touch_detect_cfg);
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/* X Measurement */
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regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_X_MEASUREMENT),
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MX25_ADCQ_CFG_YPLL_OFF |
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MX25_ADCQ_CFG_XNUR_LOW |
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MX25_ADCQ_CFG_XPUL_HIGH |
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MX25_ADCQ_CFG_REFP_XP |
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MX25_ADCQ_CFG_IN_YP |
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MX25_ADCQ_CFG_REFN_XN |
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MX25_ADCQ_CFG_NOS(priv->sample_count) |
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MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt));
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/* Y Measurement */
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regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_Y_MEASUREMENT),
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MX25_ADCQ_CFG_YNLR |
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MX25_ADCQ_CFG_YPLL_HIGH |
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MX25_ADCQ_CFG_XNUR_OFF |
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MX25_ADCQ_CFG_XPUL_OFF |
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MX25_ADCQ_CFG_REFP_YP |
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MX25_ADCQ_CFG_IN_XP |
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MX25_ADCQ_CFG_REFN_YN |
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MX25_ADCQ_CFG_NOS(priv->sample_count) |
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MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt));
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/* Enable the touch detection right now */
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regmap_write(priv->core_regs, MX25_TSC_TICR, touch_detect_cfg |
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MX25_ADCQ_CFG_IGS);
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}
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static int imx25_setup_queue_4wire(struct mx25_tcq_priv *priv,
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unsigned settling_cnt, int *items)
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{
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imx25_setup_queue_cfgs(priv, settling_cnt);
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/* Setup the conversion queue */
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regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,
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MX25_ADCQ_ITEM(0, MX25_CFG_PRECHARGE) |
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MX25_ADCQ_ITEM(1, MX25_CFG_TOUCH_DETECT) |
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MX25_ADCQ_ITEM(2, MX25_CFG_X_MEASUREMENT) |
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MX25_ADCQ_ITEM(3, MX25_CFG_Y_MEASUREMENT) |
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MX25_ADCQ_ITEM(4, MX25_CFG_PRECHARGE) |
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MX25_ADCQ_ITEM(5, MX25_CFG_TOUCH_DETECT));
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/*
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* We measure X/Y with 'sample_count' number of samples and execute a
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* touch detection twice, with 1 sample each
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*/
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priv->expected_samples = priv->sample_count * 2 + 2;
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*items = 6;
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return 0;
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}
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static void mx25_tcq_disable_touch_irq(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_PDMSK,
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MX25_ADCQ_CR_PDMSK);
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}
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static void mx25_tcq_enable_touch_irq(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_PDMSK, 0);
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}
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static void mx25_tcq_disable_fifo_irq(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_FDRY_IRQ,
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MX25_ADCQ_MR_FDRY_IRQ);
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}
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static void mx25_tcq_enable_fifo_irq(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_FDRY_IRQ, 0);
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}
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static void mx25_tcq_force_queue_start(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_FQS,
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MX25_ADCQ_CR_FQS);
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}
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static void mx25_tcq_force_queue_stop(struct mx25_tcq_priv *priv)
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{
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regmap_update_bits(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_FQS, 0);
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}
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static void mx25_tcq_fifo_reset(struct mx25_tcq_priv *priv)
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{
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u32 tcqcr;
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regmap_read(priv->regs, MX25_ADCQ_CR, &tcqcr);
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regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FRST,
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MX25_ADCQ_CR_FRST);
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regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FRST, 0);
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regmap_write(priv->regs, MX25_ADCQ_CR, tcqcr);
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}
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static void mx25_tcq_re_enable_touch_detection(struct mx25_tcq_priv *priv)
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{
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/* stop the queue from looping */
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mx25_tcq_force_queue_stop(priv);
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/* for a clean touch detection, preload the X plane */
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regmap_write(priv->core_regs, MX25_TSC_TICR, MX25_PRECHARGE_VALUE);
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/* waste some time now to pre-load the X plate to high voltage */
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mx25_tcq_fifo_reset(priv);
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/* re-enable the detection right now */
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regmap_write(priv->core_regs, MX25_TSC_TICR,
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MX25_TOUCH_DETECT_VALUE | MX25_ADCQ_CFG_IGS);
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regmap_update_bits(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_PD,
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MX25_ADCQ_SR_PD);
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/* enable the pen down event to be a source for the interrupt */
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regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_PD_IRQ, 0);
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/* lets fire the next IRQ if someone touches the touchscreen */
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mx25_tcq_enable_touch_irq(priv);
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}
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static void mx25_tcq_create_event_for_4wire(struct mx25_tcq_priv *priv,
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u32 *sample_buf,
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unsigned int samples)
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{
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unsigned int x_pos = 0;
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unsigned int y_pos = 0;
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unsigned int touch_pre = 0;
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unsigned int touch_post = 0;
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unsigned int i;
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for (i = 0; i < samples; i++) {
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unsigned int index = MX25_ADCQ_FIFO_ID(sample_buf[i]);
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unsigned int val = MX25_ADCQ_FIFO_DATA(sample_buf[i]);
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switch (index) {
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case 1:
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touch_pre = val;
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break;
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case 2:
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x_pos = val;
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break;
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case 3:
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y_pos = val;
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break;
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case 5:
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touch_post = val;
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break;
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default:
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dev_dbg(priv->dev, "Dropped samples because of invalid index %d\n",
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index);
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return;
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}
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}
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if (samples != 0) {
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/*
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* only if both touch measures are below a threshold,
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* the position is valid
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*/
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if (touch_pre < priv->pen_threshold &&
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touch_post < priv->pen_threshold) {
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/* valid samples, generate a report */
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x_pos /= priv->sample_count;
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y_pos /= priv->sample_count;
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input_report_abs(priv->idev, ABS_X, x_pos);
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input_report_abs(priv->idev, ABS_Y, y_pos);
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input_report_key(priv->idev, BTN_TOUCH, 1);
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input_sync(priv->idev);
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/* get next sample */
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mx25_tcq_enable_fifo_irq(priv);
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} else if (touch_pre >= priv->pen_threshold &&
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touch_post >= priv->pen_threshold) {
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/*
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* if both samples are invalid,
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* generate a release report
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*/
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input_report_key(priv->idev, BTN_TOUCH, 0);
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input_sync(priv->idev);
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mx25_tcq_re_enable_touch_detection(priv);
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} else {
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/*
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* if only one of both touch measurements are
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* below the threshold, still some bouncing
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* happens. Take additional samples in this
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* case to be sure
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*/
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mx25_tcq_enable_fifo_irq(priv);
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}
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}
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}
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static irqreturn_t mx25_tcq_irq_thread(int irq, void *dev_id)
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{
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struct mx25_tcq_priv *priv = dev_id;
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u32 sample_buf[TSC_MAX_SAMPLES];
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unsigned int samples;
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u32 stats;
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unsigned int i;
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/*
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* Check how many samples are available. We always have to read exactly
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* sample_count samples from the fifo, or a multiple of sample_count.
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* Otherwise we mixup samples into different touch events.
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*/
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regmap_read(priv->regs, MX25_ADCQ_SR, &stats);
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samples = MX25_ADCQ_SR_FDN(stats);
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samples -= samples % priv->sample_count;
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if (!samples)
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return IRQ_HANDLED;
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for (i = 0; i != samples; ++i)
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regmap_read(priv->regs, MX25_ADCQ_FIFO, &sample_buf[i]);
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mx25_tcq_create_event_for_4wire(priv, sample_buf, samples);
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return IRQ_HANDLED;
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}
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static irqreturn_t mx25_tcq_irq(int irq, void *dev_id)
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{
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struct mx25_tcq_priv *priv = dev_id;
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u32 stat;
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int ret = IRQ_HANDLED;
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regmap_read(priv->regs, MX25_ADCQ_SR, &stat);
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if (stat & (MX25_ADCQ_SR_FRR | MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR))
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mx25_tcq_re_enable_touch_detection(priv);
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if (stat & MX25_ADCQ_SR_PD) {
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mx25_tcq_disable_touch_irq(priv);
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mx25_tcq_force_queue_start(priv);
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mx25_tcq_enable_fifo_irq(priv);
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}
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if (stat & MX25_ADCQ_SR_FDRY) {
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mx25_tcq_disable_fifo_irq(priv);
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ret = IRQ_WAKE_THREAD;
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}
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regmap_update_bits(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |
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MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR |
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MX25_ADCQ_SR_PD,
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MX25_ADCQ_SR_FRR | MX25_ADCQ_SR_FUR |
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MX25_ADCQ_SR_FOR | MX25_ADCQ_SR_PD);
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return ret;
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}
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/* configure the state machine for a 4-wire touchscreen */
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static int mx25_tcq_init(struct mx25_tcq_priv *priv)
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{
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u32 tgcr;
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unsigned int ipg_div;
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unsigned int adc_period;
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unsigned int debounce_cnt;
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unsigned int settling_cnt;
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int itemct;
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int error;
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regmap_read(priv->core_regs, MX25_TSC_TGCR, &tgcr);
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ipg_div = max_t(unsigned int, 4, MX25_TGCR_GET_ADCCLK(tgcr));
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adc_period = USEC_PER_SEC * ipg_div * 2 + 2;
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adc_period /= clk_get_rate(priv->clk) / 1000 + 1;
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debounce_cnt = DIV_ROUND_UP(priv->pen_debounce, adc_period * 8) - 1;
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settling_cnt = DIV_ROUND_UP(priv->settling_time, adc_period * 8) - 1;
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/* Reset */
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regmap_write(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_QRST | MX25_ADCQ_CR_FRST);
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regmap_update_bits(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_QRST | MX25_ADCQ_CR_FRST, 0);
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/* up to 128 * 8 ADC clocks are possible */
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if (debounce_cnt > 127)
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debounce_cnt = 127;
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/* up to 255 * 8 ADC clocks are possible */
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if (settling_cnt > 255)
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settling_cnt = 255;
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error = imx25_setup_queue_4wire(priv, settling_cnt, &itemct);
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if (error)
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return error;
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regmap_update_bits(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_LITEMID_MASK | MX25_ADCQ_CR_WMRK_MASK,
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MX25_ADCQ_CR_LITEMID(itemct - 1) |
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MX25_ADCQ_CR_WMRK(priv->expected_samples - 1));
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/* setup debounce count */
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regmap_update_bits(priv->core_regs, MX25_TSC_TGCR,
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MX25_TGCR_PDBTIME_MASK,
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MX25_TGCR_PDBTIME(debounce_cnt));
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/* enable debounce */
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regmap_update_bits(priv->core_regs, MX25_TSC_TGCR, MX25_TGCR_PDBEN,
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MX25_TGCR_PDBEN);
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regmap_update_bits(priv->core_regs, MX25_TSC_TGCR, MX25_TGCR_PDEN,
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MX25_TGCR_PDEN);
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/* enable the engine on demand */
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regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_QSM_MASK,
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MX25_ADCQ_CR_QSM_FQS);
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/* Enable repeat and repeat wait */
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regmap_update_bits(priv->regs, MX25_ADCQ_CR,
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MX25_ADCQ_CR_RPT | MX25_ADCQ_CR_RWAIT_MASK,
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MX25_ADCQ_CR_RPT |
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MX25_ADCQ_CR_RWAIT(MX25_TSC_REPEAT_WAIT));
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return 0;
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}
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static int mx25_tcq_parse_dt(struct platform_device *pdev,
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struct mx25_tcq_priv *priv)
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{
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struct device_node *np = pdev->dev.of_node;
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u32 wires;
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int error;
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/* Setup defaults */
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priv->pen_threshold = 500;
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priv->sample_count = 3;
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priv->pen_debounce = 1000000;
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priv->settling_time = 250000;
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error = of_property_read_u32(np, "fsl,wires", &wires);
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if (error) {
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dev_err(&pdev->dev, "Failed to find fsl,wires properties\n");
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return error;
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}
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if (wires == 4) {
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priv->mode = MX25_TS_4WIRE;
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|
} else {
|
|
dev_err(&pdev->dev, "%u-wire mode not supported\n", wires);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* These are optional, we don't care about the return values */
|
|
of_property_read_u32(np, "fsl,pen-threshold", &priv->pen_threshold);
|
|
of_property_read_u32(np, "fsl,settling-time-ns", &priv->settling_time);
|
|
of_property_read_u32(np, "fsl,pen-debounce-ns", &priv->pen_debounce);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx25_tcq_open(struct input_dev *idev)
|
|
{
|
|
struct device *dev = &idev->dev;
|
|
struct mx25_tcq_priv *priv = dev_get_drvdata(dev);
|
|
int error;
|
|
|
|
error = clk_prepare_enable(priv->clk);
|
|
if (error) {
|
|
dev_err(dev, "Failed to enable ipg clock\n");
|
|
return error;
|
|
}
|
|
|
|
error = mx25_tcq_init(priv);
|
|
if (error) {
|
|
dev_err(dev, "Failed to init tcq\n");
|
|
clk_disable_unprepare(priv->clk);
|
|
return error;
|
|
}
|
|
|
|
mx25_tcq_re_enable_touch_detection(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mx25_tcq_close(struct input_dev *idev)
|
|
{
|
|
struct mx25_tcq_priv *priv = input_get_drvdata(idev);
|
|
|
|
mx25_tcq_force_queue_stop(priv);
|
|
mx25_tcq_disable_touch_irq(priv);
|
|
mx25_tcq_disable_fifo_irq(priv);
|
|
clk_disable_unprepare(priv->clk);
|
|
}
|
|
|
|
static int mx25_tcq_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct input_dev *idev;
|
|
struct mx25_tcq_priv *priv;
|
|
struct mx25_tsadc *tsadc = dev_get_drvdata(dev->parent);
|
|
struct resource *res;
|
|
void __iomem *mem;
|
|
int error;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
priv->dev = dev;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
mem = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(mem))
|
|
return PTR_ERR(mem);
|
|
|
|
error = mx25_tcq_parse_dt(pdev, priv);
|
|
if (error)
|
|
return error;
|
|
|
|
priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_tcq_regconfig);
|
|
if (IS_ERR(priv->regs)) {
|
|
dev_err(dev, "Failed to initialize regmap\n");
|
|
return PTR_ERR(priv->regs);
|
|
}
|
|
|
|
priv->irq = platform_get_irq(pdev, 0);
|
|
if (priv->irq <= 0) {
|
|
dev_err(dev, "Failed to get IRQ\n");
|
|
return priv->irq;
|
|
}
|
|
|
|
idev = devm_input_allocate_device(dev);
|
|
if (!idev) {
|
|
dev_err(dev, "Failed to allocate input device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
idev->name = mx25_tcq_name;
|
|
input_set_capability(idev, EV_KEY, BTN_TOUCH);
|
|
input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0);
|
|
input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0);
|
|
|
|
idev->id.bustype = BUS_HOST;
|
|
idev->open = mx25_tcq_open;
|
|
idev->close = mx25_tcq_close;
|
|
|
|
priv->idev = idev;
|
|
input_set_drvdata(idev, priv);
|
|
|
|
priv->core_regs = tsadc->regs;
|
|
if (!priv->core_regs)
|
|
return -EINVAL;
|
|
|
|
priv->clk = tsadc->clk;
|
|
if (!priv->clk)
|
|
return -EINVAL;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
error = devm_request_threaded_irq(dev, priv->irq, mx25_tcq_irq,
|
|
mx25_tcq_irq_thread, 0, pdev->name,
|
|
priv);
|
|
if (error) {
|
|
dev_err(dev, "Failed requesting IRQ\n");
|
|
return error;
|
|
}
|
|
|
|
error = input_register_device(idev);
|
|
if (error) {
|
|
dev_err(dev, "Failed to register input device\n");
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mx25_tcq_driver = {
|
|
.driver = {
|
|
.name = "mx25-tcq",
|
|
.of_match_table = mx25_tcq_ids,
|
|
},
|
|
.probe = mx25_tcq_probe,
|
|
};
|
|
module_platform_driver(mx25_tcq_driver);
|
|
|
|
MODULE_DESCRIPTION("TS input driver for Freescale mx25");
|
|
MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
|
|
MODULE_LICENSE("GPL v2");
|