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Message-ID: <1426182312-6081-2-git-send-email-jonathar@broadcom.com>
Date: Thu, 12 Mar 2015 10:45:11 -0700
From: Jonathan Richardson <jonathar@...adcom.com>
To: Dmitry Torokhov <dtor@...gle.com>,
Anatol Pomazau <anatol@...gle.com>
CC: Jonathan Richardson <jonathar@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>, Ray Jui <rjui@...adcom.com>,
<linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
<devicetree@...r.kernel.org>, Joe Perches <joe@...ches.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>
Subject: [PATCH v4 1/2] Input: touchscreen-iproc: Add Broadcom iProc touchscreen driver
Add initial version of the Broadcom touchscreen driver.
Reviewed-by: Ray Jui <rjui@...adcom.com>
Reviewed-by: Scott Branden <sbranden@...adcom.com>
Tested-by: Scott Branden <sbranden@...adcom.com>
Signed-off-by: Jonathan Richardson <jonathar@...adcom.com>
---
drivers/input/touchscreen/Kconfig | 11 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/bcm_iproc_tsc.c | 527 +++++++++++++++++++++++++++++
3 files changed, 539 insertions(+)
create mode 100644 drivers/input/touchscreen/bcm_iproc_tsc.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6261fd6..4a8b0e5 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -323,6 +323,17 @@ config TOUCHSCREEN_ILI210X
To compile this driver as a module, choose M here: the
module will be called ili210x.
+config TOUCHSCREEN_IPROC
+ tristate "IPROC touch panel driver support"
+ help
+ Say Y here if you want to add support for the IPROC touch
+ controller to your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called bcm_iproc_tsc.
+
config TOUCHSCREEN_S3C2410
tristate "Samsung S3C2410/generic touchscreen input driver"
depends on ARCH_S3C24XX || SAMSUNG_DEV_TS
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 0242fea..68f69bc 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
+obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
diff --git a/drivers/input/touchscreen/bcm_iproc_tsc.c b/drivers/input/touchscreen/bcm_iproc_tsc.c
new file mode 100644
index 0000000..54c4dd1
--- /dev/null
+++ b/drivers/input/touchscreen/bcm_iproc_tsc.c
@@ -0,0 +1,527 @@
+/*
+* Copyright (C) 2015 Broadcom Corporation
+*
+* 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 version 2.
+*
+* This program is distributed "as is" WITHOUT ANY WARRANTY of any
+* kind, whether express or implied; without even the implied warranty
+* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*/
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/keyboard.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <asm/irq.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/serio.h>
+
+#define IPROC_TS_NAME "iproc-ts"
+
+#define PEN_DOWN_STATUS 1
+#define PEN_UP_STATUS 0
+
+#define X_MIN 0
+#define Y_MIN 0
+#define X_MAX 0xFFF
+#define Y_MAX 0xFFF
+
+/* Value given by controller for invalid coordinate. */
+#define INVALID_COORD 0xFFFFFFFF
+
+/* Register offsets */
+#define REGCTL1 0x00
+#define REGCTL2 0x04
+#define INTERRUPT_THRES 0x08
+#define INTERRUPT_MASK 0x0c
+
+#define INTERRUPT_STATUS 0x10
+#define CONTROLLER_STATUS 0x14
+#define FIFO_DATA 0x18
+#define FIFO_DATA_X_Y_MASK 0xFFFF
+#define ANALOG_CONTROL 0x1c
+
+#define AUX_DATA 0x20
+#define DEBOUNCE_CNTR_STAT 0x24
+#define SCAN_CNTR_STAT 0x28
+#define REM_CNTR_STAT 0x2c
+
+#define SETTLING_TIMER_STAT 0x30
+#define SPARE_REG 0x34
+#define SOFT_BYPASS_CONTROL 0x38
+#define SOFT_BYPASS_DATA 0x3c
+
+
+/* Bit values for INTERRUPT_MASK and INTERRUPT_STATUS regs */
+#define TS_PEN_INTR_MASK BIT(0)
+#define TS_FIFO_INTR_MASK BIT(2)
+
+/* Bit values for CONTROLLER_STATUS reg1 */
+#define TS_PEN_DOWN BIT(0)
+
+/* Shift values for control reg1 */
+#define SCANNING_PERIOD_SHIFT 24
+#define DEBOUNCE_TIMEOUT_SHIFT 16
+#define SETTLING_TIMEOUT_SHIFT 8
+#define TOUCH_TIMEOUT_SHIFT 0
+
+/* Shift values for coordinates from fifo */
+#define X_COORD_SHIFT 0
+#define Y_COORD_SHIFT 16
+
+/* Bit values for REGCTL2 */
+#define TS_CONTROLLER_EN_BIT BIT(16)
+#define TS_CONTROLLER_AVGDATA_SHIFT 8
+#define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
+#define TS_CONTROLLER_PWR_LDO BIT(5)
+#define TS_CONTROLLER_PWR_ADC BIT(4)
+#define TS_CONTROLLER_PWR_BGP BIT(3)
+#define TS_CONTROLLER_PWR_TS BIT(2)
+#define TS_WIRE_MODE_BIT BIT(1)
+
+struct tsc_param {
+ /* Each step is 1024 us. Valid 1-256 */
+ u32 scanning_period;
+
+ /* Each step is 512 us. Valid 0-255 */
+ u32 debounce_timeout;
+
+ /*
+ * The settling duration (in ms) is the amount of time the tsc
+ * waits to allow the voltage to settle after turning on the
+ * drivers in detection mode. Valid values: 0-11
+ * 0 = 0.008 ms
+ * 1 = 0.01 ms
+ * 2 = 0.02 ms
+ * 3 = 0.04 ms
+ * 4 = 0.08 ms
+ * 5 = 0.16 ms
+ * 6 = 0.32 ms
+ * 7 = 0.64 ms
+ * 8 = 1.28 ms
+ * 9 = 2.56 ms
+ * 10 = 5.12 ms
+ * 11 = 10.24 ms
+ */
+ u32 settling_timeout;
+
+ /* touch timeout in sample counts */
+ u32 touch_timeout;
+
+ /*
+ * Number of data samples which are averaged before a final data point
+ * is placed into the FIFO
+ */
+ u32 average_data;
+
+ /* FIFO threshold */
+ u32 fifo_threshold;
+
+ /* Optional standard touchscreen properties. */
+ u32 max_x;
+ u32 max_y;
+ u32 fuzz_x;
+ u32 fuzz_y;
+ bool invert_x;
+ bool invert_y;
+};
+
+struct iproc_ts_priv {
+ struct platform_device *pdev;
+ struct input_dev *idev;
+
+ void __iomem *regs;
+ struct clk *tsc_clk;
+
+ int pen_status;
+ struct tsc_param cfg_params;
+};
+
+/*
+ * Set default values the same as hardware reset values
+ * except for fifo_threshold with is set to 1.
+ */
+static struct tsc_param default_config = {
+ .scanning_period = 0x5, /* 1 to 256 */
+ .debounce_timeout = 0x28, /* 0 to 255 */
+ .settling_timeout = 0x7, /* 0 to 11 */
+ .touch_timeout = 0xa, /* 0 to 255 */
+ .average_data = 5, /* entry 5 = 32 pts */
+ .fifo_threshold = 1, /* 0 to 31 */
+ .max_x = X_MAX,
+ .max_y = Y_MAX,
+};
+
+static void ts_reg_dump(struct iproc_ts_priv *priv)
+{
+ struct device *dev = &priv->pdev->dev;
+
+ dev_dbg(dev, "regCtl1 = 0x%08x\n",
+ readl(priv->regs + REGCTL1));
+ dev_dbg(dev, "regCtl2 = 0x%08x\n",
+ readl(priv->regs + REGCTL2));
+ dev_dbg(dev, "interrupt_Thres = 0x%08x\n",
+ readl(priv->regs + INTERRUPT_THRES));
+ dev_dbg(dev, "interrupt_Mask = 0x%08x\n",
+ readl(priv->regs + INTERRUPT_MASK));
+ dev_dbg(dev, "interrupt_Status = 0x%08x\n",
+ readl(priv->regs + INTERRUPT_STATUS));
+ dev_dbg(dev, "controller_Status = 0x%08x\n",
+ readl(priv->regs + CONTROLLER_STATUS));
+ dev_dbg(dev, "FIFO_Data = 0x%08x\n",
+ readl(priv->regs + FIFO_DATA));
+ dev_dbg(dev, "analog_Control = 0x%08x\n",
+ readl(priv->regs + ANALOG_CONTROL));
+ dev_dbg(dev, "aux_Data = 0x%08x\n",
+ readl(priv->regs + AUX_DATA));
+ dev_dbg(dev, "debounce_Cntr_Stat = 0x%08x\n",
+ readl(priv->regs + DEBOUNCE_CNTR_STAT));
+ dev_dbg(dev, "scan_Cntr_Stat = 0x%08x\n",
+ readl(priv->regs + SCAN_CNTR_STAT));
+ dev_dbg(dev, "rem_Cntr_Stat = 0x%08x\n",
+ readl(priv->regs + REM_CNTR_STAT));
+ dev_dbg(dev, "settling_Timer_Stat = 0x%08x\n",
+ readl(priv->regs + SETTLING_TIMER_STAT));
+ dev_dbg(dev, "spare_Reg = 0x%08x\n",
+ readl(priv->regs + SPARE_REG));
+ dev_dbg(dev, "soft_Bypass_Control = 0x%08x\n",
+ readl(priv->regs + SOFT_BYPASS_CONTROL));
+ dev_dbg(dev, "soft_Bypass_Data = 0x%08x\n",
+ readl(priv->regs + SOFT_BYPASS_DATA));
+}
+
+static irqreturn_t iproc_touchscreen_interrupt(int irq, void *data)
+{
+ struct platform_device *pdev = data;
+ struct iproc_ts_priv *priv = platform_get_drvdata(pdev);
+ u32 intr_status;
+ u32 raw_coordinate;
+ u16 x;
+ u16 y;
+ int i;
+ bool needs_sync = false;
+
+ intr_status = readl(priv->regs + INTERRUPT_STATUS);
+ intr_status &= (TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK);
+ if (intr_status == 0)
+ return IRQ_NONE;
+
+ /* Clear all interrupt status bits, write-1-clear */
+ writel(intr_status, priv->regs + INTERRUPT_STATUS);
+
+ /* Pen up/down */
+ if (intr_status & TS_PEN_INTR_MASK) {
+ if (readl(priv->regs + CONTROLLER_STATUS) & TS_PEN_DOWN)
+ priv->pen_status = PEN_DOWN_STATUS;
+ else
+ priv->pen_status = PEN_UP_STATUS;
+
+ input_report_key(priv->idev, BTN_TOUCH, priv->pen_status);
+ needs_sync = true;
+
+ dev_dbg(&priv->pdev->dev,
+ "pen up-down (%d)\n", priv->pen_status);
+ }
+
+ /* coordinates in FIFO exceed the theshold */
+ if (intr_status & TS_FIFO_INTR_MASK) {
+ for (i = 0; i < priv->cfg_params.fifo_threshold; i++) {
+ raw_coordinate = readl(priv->regs + FIFO_DATA);
+ if (raw_coordinate == INVALID_COORD)
+ continue;
+
+ /*
+ * The x and y coordinate are 16 bits each
+ * with the x in the lower 16 bits and y in the
+ * upper 16 bits.
+ */
+ x = (raw_coordinate >> X_COORD_SHIFT) &
+ FIFO_DATA_X_Y_MASK;
+ y = (raw_coordinate >> Y_COORD_SHIFT) &
+ FIFO_DATA_X_Y_MASK;
+
+ /* We only want to retain the 12 msb of the 16 */
+ x = (x >> 4) & 0x0FFF;
+ y = (y >> 4) & 0x0FFF;
+
+ /* adjust x y according to lcd tsc mount angle */
+ if (priv->cfg_params.invert_x)
+ x = priv->cfg_params.max_x - x;
+
+ if (priv->cfg_params.invert_y)
+ y = priv->cfg_params.max_y - y;
+
+ input_report_abs(priv->idev, ABS_X, x);
+ input_report_abs(priv->idev, ABS_Y, y);
+ needs_sync = true;
+
+ dev_dbg(&priv->pdev->dev, "xy (0x%x 0x%x)\n", x, y);
+ }
+ }
+
+ if (needs_sync)
+ input_sync(priv->idev);
+
+ return IRQ_HANDLED;
+}
+
+static int iproc_ts_start(struct input_dev *idev)
+{
+ u32 val;
+ int ret;
+ struct iproc_ts_priv *priv = input_get_drvdata(idev);
+
+ /* Enable clock */
+ ret = clk_prepare_enable(priv->tsc_clk);
+ if (ret) {
+ dev_err(&priv->pdev->dev, "%s clk_prepare_enable failed %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ /*
+ * Interrupt is generated when:
+ * FIFO reaches the int_th value, and pen event(up/down)
+ */
+ val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
+ writel(val, priv->regs + INTERRUPT_MASK);
+
+ writel(priv->cfg_params.fifo_threshold, priv->regs + INTERRUPT_THRES);
+
+ /* Initialize control reg1 */
+ val = 0;
+ val |= priv->cfg_params.scanning_period << SCANNING_PERIOD_SHIFT;
+ val |= priv->cfg_params.debounce_timeout << DEBOUNCE_TIMEOUT_SHIFT;
+ val |= priv->cfg_params.settling_timeout << SETTLING_TIMEOUT_SHIFT;
+ val |= priv->cfg_params.touch_timeout << TOUCH_TIMEOUT_SHIFT;
+ writel(val, priv->regs + REGCTL1);
+
+ /* Try to clear all interrupt status */
+ val = readl(priv->regs + INTERRUPT_STATUS);
+ val |= TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
+ writel(val, priv->regs + INTERRUPT_STATUS);
+
+ /* Initialize control reg2 */
+ val = readl(priv->regs + REGCTL2);
+ val |= TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
+
+ val &= ~(TS_CONTROLLER_AVGDATA_MASK);
+ val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
+
+ val &= ~(TS_CONTROLLER_PWR_LDO | /* PWR up LDO */
+ TS_CONTROLLER_PWR_ADC | /* PWR up ADC */
+ TS_CONTROLLER_PWR_BGP | /* PWR up BGP */
+ TS_CONTROLLER_PWR_TS); /* PWR up TS */
+
+ writel(val, priv->regs + REGCTL2);
+
+ ts_reg_dump(priv);
+
+ return 0;
+}
+
+static void iproc_ts_stop(struct input_dev *dev)
+{
+ u32 val;
+ struct iproc_ts_priv *priv = input_get_drvdata(dev);
+
+ writel(0, priv->regs + INTERRUPT_MASK); /* Disable all interrupts */
+
+ /* Only power down touch screen controller */
+ val = readl(priv->regs + REGCTL2);
+ val |= TS_CONTROLLER_PWR_TS;
+ writel(val, priv->regs + REGCTL2);
+
+ clk_disable(priv->tsc_clk);
+}
+
+static int get_tsc_config(struct device_node *np, struct iproc_ts_priv *priv)
+{
+ u32 val;
+ struct device *dev = &priv->pdev->dev;
+
+ priv->cfg_params = default_config;
+
+ if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
+ if (val < 1 || val > 256) {
+ dev_err(dev, "scanning_period must be [1-256]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.scanning_period = val;
+ }
+
+ if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
+ if (val < 0 || val > 255) {
+ dev_err(dev, "debounce_timeout must be [0-255]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.debounce_timeout = val;
+ }
+
+ if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
+ if (val < 0 || val > 11) {
+ dev_err(dev, "settling_timeout must be [0-11]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.settling_timeout = val;
+ }
+
+ if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
+ if (val < 0 || val > 255) {
+ dev_err(dev, "touch_timeout must be [0-255]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.touch_timeout = val;
+ }
+
+ if (of_property_read_u32(np, "average_data", &val) >= 0) {
+ if (val < 0 || val > 8) {
+ dev_err(dev, "average_data must be [0-8]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.average_data = val;
+ }
+
+ if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
+ if (val < 0 || val > 31) {
+ dev_err(dev, "fifo_threshold must be [0-31]\n");
+ return -EINVAL;
+ }
+ priv->cfg_params.fifo_threshold = val;
+ }
+
+ /* Parse optional properties. */
+ of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
+ of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
+
+ of_property_read_u32(np, "touchscreen-fuzz-x",
+ &priv->cfg_params.fuzz_x);
+ of_property_read_u32(np, "touchscreen-fuzz-y",
+ &priv->cfg_params.fuzz_y);
+
+ priv->cfg_params.invert_x = of_property_read_bool(np,
+ "touchscreen-inverted-x");
+ priv->cfg_params.invert_y = of_property_read_bool(np,
+ "touchscreen-inverted-y");
+
+ return 0;
+}
+
+static int iproc_ts_probe(struct platform_device *pdev)
+{
+ struct iproc_ts_priv *priv;
+ struct input_dev *idev;
+ struct resource *res;
+ int ret;
+ int irq;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* touchscreen controller memory mapped regs */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->regs)) {
+ dev_err(&pdev->dev, "unable to map I/O memory\n");
+ return PTR_ERR(priv->regs);
+ }
+
+ priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
+ if (IS_ERR(priv->tsc_clk)) {
+ dev_err(&pdev->dev,
+ "%s Failed getting clock tsc_clk\n", __func__);
+ return PTR_ERR(priv->tsc_clk);
+ }
+
+ ret = get_tsc_config(pdev->dev.of_node, priv);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "%s get_tsc_config failed\n", __func__);
+ return ret;
+ }
+
+ idev = devm_input_allocate_device(&pdev->dev);
+ if (!idev) {
+ dev_err(&pdev->dev,
+ "%s Allocate input device failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ priv->idev = idev;
+ priv->pdev = pdev;
+
+ priv->pen_status = PEN_UP_STATUS;
+
+ /* Set input device info */
+ idev->name = IPROC_TS_NAME;
+ idev->dev.parent = &pdev->dev;
+
+ idev->id.bustype = BUS_HOST;
+ idev->id.vendor = SERIO_UNKNOWN;
+ idev->id.product = 0;
+ idev->id.version = 0;
+
+ idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ set_bit(BTN_TOUCH, idev->keybit);
+
+ input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
+ priv->cfg_params.fuzz_x, 0);
+ input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
+ priv->cfg_params.fuzz_y, 0);
+
+ idev->open = iproc_ts_start;
+ idev->close = iproc_ts_stop;
+
+ input_set_drvdata(idev, priv);
+ platform_set_drvdata(pdev, priv);
+
+ /* get interrupt */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "%s platform_get_irq failed\n", __func__);
+ return irq;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq,
+ iproc_touchscreen_interrupt,
+ IRQF_SHARED, IPROC_TS_NAME, pdev);
+ if (ret)
+ return ret;
+
+ ret = input_register_device(priv->idev);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "%s register input device failed %d\n", __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id iproc_ts_of_match[] = {
+ {.compatible = "brcm,iproc-touchscreen", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, iproc_ts_of_match);
+
+static struct platform_driver iproc_ts_driver = {
+ .probe = iproc_ts_probe,
+ .driver = {
+ .name = IPROC_TS_NAME,
+ .of_match_table = of_match_ptr(iproc_ts_of_match),
+ },
+};
+
+module_platform_driver(iproc_ts_driver);
+
+MODULE_DESCRIPTION("IPROC Touchscreen driver");
+MODULE_AUTHOR("Broadcom");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
--
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