Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 345 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/lpc32xx_ts.c b/drivers/input/touchscreen/lpc32xx_ts.c
new file mode 100644
index 0000000000..9bad8b93c0
--- /dev/null
+++ b/drivers/input/touchscreen/lpc32xx_ts.c
@@ -0,0 +1,345 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * LPC32xx built-in touchscreen driver
+ *
+ * Copyright (C) 2010 NXP Semiconductors
+ */
+
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+/*
+ * Touchscreen controller register offsets
+ */
+#define LPC32XX_TSC_STAT			0x00
+#define LPC32XX_TSC_SEL				0x04
+#define LPC32XX_TSC_CON				0x08
+#define LPC32XX_TSC_FIFO			0x0C
+#define LPC32XX_TSC_DTR				0x10
+#define LPC32XX_TSC_RTR				0x14
+#define LPC32XX_TSC_UTR				0x18
+#define LPC32XX_TSC_TTR				0x1C
+#define LPC32XX_TSC_DXP				0x20
+#define LPC32XX_TSC_MIN_X			0x24
+#define LPC32XX_TSC_MAX_X			0x28
+#define LPC32XX_TSC_MIN_Y			0x2C
+#define LPC32XX_TSC_MAX_Y			0x30
+#define LPC32XX_TSC_AUX_UTR			0x34
+#define LPC32XX_TSC_AUX_MIN			0x38
+#define LPC32XX_TSC_AUX_MAX			0x3C
+
+#define LPC32XX_TSC_STAT_FIFO_OVRRN		BIT(8)
+#define LPC32XX_TSC_STAT_FIFO_EMPTY		BIT(7)
+
+#define LPC32XX_TSC_SEL_DEFVAL			0x0284
+
+#define LPC32XX_TSC_ADCCON_IRQ_TO_FIFO_4	(0x1 << 11)
+#define LPC32XX_TSC_ADCCON_X_SAMPLE_SIZE(s)	((10 - (s)) << 7)
+#define LPC32XX_TSC_ADCCON_Y_SAMPLE_SIZE(s)	((10 - (s)) << 4)
+#define LPC32XX_TSC_ADCCON_POWER_UP		BIT(2)
+#define LPC32XX_TSC_ADCCON_AUTO_EN		BIT(0)
+
+#define LPC32XX_TSC_FIFO_TS_P_LEVEL		BIT(31)
+#define LPC32XX_TSC_FIFO_NORMALIZE_X_VAL(x)	(((x) & 0x03FF0000) >> 16)
+#define LPC32XX_TSC_FIFO_NORMALIZE_Y_VAL(y)	((y) & 0x000003FF)
+
+#define LPC32XX_TSC_ADCDAT_VALUE_MASK		0x000003FF
+
+#define LPC32XX_TSC_MIN_XY_VAL			0x0
+#define LPC32XX_TSC_MAX_XY_VAL			0x3FF
+
+#define MOD_NAME "ts-lpc32xx"
+
+#define tsc_readl(dev, reg) \
+	__raw_readl((dev)->tsc_base + (reg))
+#define tsc_writel(dev, reg, val) \
+	__raw_writel((val), (dev)->tsc_base + (reg))
+
+struct lpc32xx_tsc {
+	struct input_dev *dev;
+	void __iomem *tsc_base;
+	int irq;
+	struct clk *clk;
+};
+
+static void lpc32xx_fifo_clear(struct lpc32xx_tsc *tsc)
+{
+	while (!(tsc_readl(tsc, LPC32XX_TSC_STAT) &
+			LPC32XX_TSC_STAT_FIFO_EMPTY))
+		tsc_readl(tsc, LPC32XX_TSC_FIFO);
+}
+
+static irqreturn_t lpc32xx_ts_interrupt(int irq, void *dev_id)
+{
+	u32 tmp, rv[4], xs[4], ys[4];
+	int idx;
+	struct lpc32xx_tsc *tsc = dev_id;
+	struct input_dev *input = tsc->dev;
+
+	tmp = tsc_readl(tsc, LPC32XX_TSC_STAT);
+
+	if (tmp & LPC32XX_TSC_STAT_FIFO_OVRRN) {
+		/* FIFO overflow - throw away samples */
+		lpc32xx_fifo_clear(tsc);
+		return IRQ_HANDLED;
+	}
+
+	/*
+	 * Gather and normalize 4 samples. Pen-up events may have less
+	 * than 4 samples, but its ok to pop 4 and let the last sample
+	 * pen status check drop the samples.
+	 */
+	idx = 0;
+	while (idx < 4 &&
+	       !(tsc_readl(tsc, LPC32XX_TSC_STAT) &
+			LPC32XX_TSC_STAT_FIFO_EMPTY)) {
+		tmp = tsc_readl(tsc, LPC32XX_TSC_FIFO);
+		xs[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -
+			LPC32XX_TSC_FIFO_NORMALIZE_X_VAL(tmp);
+		ys[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -
+			LPC32XX_TSC_FIFO_NORMALIZE_Y_VAL(tmp);
+		rv[idx] = tmp;
+		idx++;
+	}
+
+	/* Data is only valid if pen is still down in last sample */
+	if (!(rv[3] & LPC32XX_TSC_FIFO_TS_P_LEVEL) && idx == 4) {
+		/* Use average of 2nd and 3rd sample for position */
+		input_report_abs(input, ABS_X, (xs[1] + xs[2]) / 2);
+		input_report_abs(input, ABS_Y, (ys[1] + ys[2]) / 2);
+		input_report_key(input, BTN_TOUCH, 1);
+	} else {
+		input_report_key(input, BTN_TOUCH, 0);
+	}
+
+	input_sync(input);
+
+	return IRQ_HANDLED;
+}
+
+static void lpc32xx_stop_tsc(struct lpc32xx_tsc *tsc)
+{
+	/* Disable auto mode */
+	tsc_writel(tsc, LPC32XX_TSC_CON,
+		   tsc_readl(tsc, LPC32XX_TSC_CON) &
+			     ~LPC32XX_TSC_ADCCON_AUTO_EN);
+
+	clk_disable_unprepare(tsc->clk);
+}
+
+static int lpc32xx_setup_tsc(struct lpc32xx_tsc *tsc)
+{
+	u32 tmp;
+	int err;
+
+	err = clk_prepare_enable(tsc->clk);
+	if (err)
+		return err;
+
+	tmp = tsc_readl(tsc, LPC32XX_TSC_CON) & ~LPC32XX_TSC_ADCCON_POWER_UP;
+
+	/* Set the TSC FIFO depth to 4 samples @ 10-bits per sample (max) */
+	tmp = LPC32XX_TSC_ADCCON_IRQ_TO_FIFO_4 |
+	      LPC32XX_TSC_ADCCON_X_SAMPLE_SIZE(10) |
+	      LPC32XX_TSC_ADCCON_Y_SAMPLE_SIZE(10);
+	tsc_writel(tsc, LPC32XX_TSC_CON, tmp);
+
+	/* These values are all preset */
+	tsc_writel(tsc, LPC32XX_TSC_SEL, LPC32XX_TSC_SEL_DEFVAL);
+	tsc_writel(tsc, LPC32XX_TSC_MIN_X, LPC32XX_TSC_MIN_XY_VAL);
+	tsc_writel(tsc, LPC32XX_TSC_MAX_X, LPC32XX_TSC_MAX_XY_VAL);
+	tsc_writel(tsc, LPC32XX_TSC_MIN_Y, LPC32XX_TSC_MIN_XY_VAL);
+	tsc_writel(tsc, LPC32XX_TSC_MAX_Y, LPC32XX_TSC_MAX_XY_VAL);
+
+	/* Aux support is not used */
+	tsc_writel(tsc, LPC32XX_TSC_AUX_UTR, 0);
+	tsc_writel(tsc, LPC32XX_TSC_AUX_MIN, 0);
+	tsc_writel(tsc, LPC32XX_TSC_AUX_MAX, 0);
+
+	/*
+	 * Set sample rate to about 240Hz per X/Y pair. A single measurement
+	 * consists of 4 pairs which gives about a 60Hz sample rate based on
+	 * a stable 32768Hz clock source. Values are in clocks.
+	 * Rate is (32768 / (RTR + XCONV + RTR + YCONV + DXP + TTR + UTR) / 4
+	 */
+	tsc_writel(tsc, LPC32XX_TSC_RTR, 0x2);
+	tsc_writel(tsc, LPC32XX_TSC_DTR, 0x2);
+	tsc_writel(tsc, LPC32XX_TSC_TTR, 0x10);
+	tsc_writel(tsc, LPC32XX_TSC_DXP, 0x4);
+	tsc_writel(tsc, LPC32XX_TSC_UTR, 88);
+
+	lpc32xx_fifo_clear(tsc);
+
+	/* Enable automatic ts event capture */
+	tsc_writel(tsc, LPC32XX_TSC_CON, tmp | LPC32XX_TSC_ADCCON_AUTO_EN);
+
+	return 0;
+}
+
+static int lpc32xx_ts_open(struct input_dev *dev)
+{
+	struct lpc32xx_tsc *tsc = input_get_drvdata(dev);
+
+	return lpc32xx_setup_tsc(tsc);
+}
+
+static void lpc32xx_ts_close(struct input_dev *dev)
+{
+	struct lpc32xx_tsc *tsc = input_get_drvdata(dev);
+
+	lpc32xx_stop_tsc(tsc);
+}
+
+static int lpc32xx_ts_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct lpc32xx_tsc *tsc;
+	struct input_dev *input;
+	int irq;
+	int error;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
+	if (!tsc)
+		return -ENOMEM;
+
+	tsc->irq = irq;
+
+	tsc->tsc_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(tsc->tsc_base))
+		return PTR_ERR(tsc->tsc_base);
+
+	tsc->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(tsc->clk)) {
+		dev_err(&pdev->dev, "failed getting clock\n");
+		return PTR_ERR(tsc->clk);
+	}
+
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(&pdev->dev, "failed allocating input device\n");
+		return -ENOMEM;
+	}
+
+	input->name = MOD_NAME;
+	input->phys = "lpc32xx/input0";
+	input->id.bustype = BUS_HOST;
+	input->id.vendor = 0x0001;
+	input->id.product = 0x0002;
+	input->id.version = 0x0100;
+	input->open = lpc32xx_ts_open;
+	input->close = lpc32xx_ts_close;
+
+	input_set_capability(input, EV_KEY, BTN_TOUCH);
+	input_set_abs_params(input, ABS_X, LPC32XX_TSC_MIN_XY_VAL,
+			     LPC32XX_TSC_MAX_XY_VAL, 0, 0);
+	input_set_abs_params(input, ABS_Y, LPC32XX_TSC_MIN_XY_VAL,
+			     LPC32XX_TSC_MAX_XY_VAL, 0, 0);
+
+	input_set_drvdata(input, tsc);
+	tsc->dev = input;
+
+	error = devm_request_irq(dev, tsc->irq, lpc32xx_ts_interrupt,
+				 0, pdev->name, tsc);
+	if (error) {
+		dev_err(&pdev->dev, "failed requesting interrupt\n");
+		return error;
+	}
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(&pdev->dev, "failed registering input device\n");
+		return error;
+	}
+
+	platform_set_drvdata(pdev, tsc);
+	device_init_wakeup(&pdev->dev, true);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int lpc32xx_ts_suspend(struct device *dev)
+{
+	struct lpc32xx_tsc *tsc = dev_get_drvdata(dev);
+	struct input_dev *input = tsc->dev;
+
+	/*
+	 * Suspend and resume can be called when the device hasn't been
+	 * enabled. If there are no users that have the device open, then
+	 * avoid calling the TSC stop and start functions as the TSC
+	 * isn't yet clocked.
+	 */
+	mutex_lock(&input->mutex);
+
+	if (input_device_enabled(input)) {
+		if (device_may_wakeup(dev))
+			enable_irq_wake(tsc->irq);
+		else
+			lpc32xx_stop_tsc(tsc);
+	}
+
+	mutex_unlock(&input->mutex);
+
+	return 0;
+}
+
+static int lpc32xx_ts_resume(struct device *dev)
+{
+	struct lpc32xx_tsc *tsc = dev_get_drvdata(dev);
+	struct input_dev *input = tsc->dev;
+
+	mutex_lock(&input->mutex);
+
+	if (input_device_enabled(input)) {
+		if (device_may_wakeup(dev))
+			disable_irq_wake(tsc->irq);
+		else
+			lpc32xx_setup_tsc(tsc);
+	}
+
+	mutex_unlock(&input->mutex);
+
+	return 0;
+}
+
+static const struct dev_pm_ops lpc32xx_ts_pm_ops = {
+	.suspend	= lpc32xx_ts_suspend,
+	.resume		= lpc32xx_ts_resume,
+};
+#define LPC32XX_TS_PM_OPS (&lpc32xx_ts_pm_ops)
+#else
+#define LPC32XX_TS_PM_OPS NULL
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id lpc32xx_tsc_of_match[] = {
+	{ .compatible = "nxp,lpc3220-tsc", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, lpc32xx_tsc_of_match);
+#endif
+
+static struct platform_driver lpc32xx_ts_driver = {
+	.probe		= lpc32xx_ts_probe,
+	.driver		= {
+		.name	= MOD_NAME,
+		.pm	= LPC32XX_TS_PM_OPS,
+		.of_match_table = of_match_ptr(lpc32xx_tsc_of_match),
+	},
+};
+module_platform_driver(lpc32xx_ts_driver);
+
+MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com");
+MODULE_DESCRIPTION("LPC32XX TSC Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lpc32xx_ts");