* [PATCH v4] input: add support for TI Touchscreen controller.
@ 2011-08-11 12:31 Patil, Rachna
[not found] ` <CAM=Q2ctN-rGkWZUsDnuiwFANjyknq56ShyWvn60H9ihPb2XvrA@mail.gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Patil, Rachna @ 2011-08-11 12:31 UTC (permalink / raw)
To: linux-input; +Cc: Dmitry Torokhov, Dmitry Torokhov, Patil, Rachna
This patch adds support for TI's touchscreen
controller for a 4/5/8 wire resistive panel
that is directly fed to the ADC.
This touchscreen controller will be part of
an upcoming TI SoC and has been tested on
an emulation platform.
ChangeLog:
v2: fixed comments from Dimitry
v3: made the driver depend on HAVE_CLK for build
v4: error handling added
Signed-off-by: Patil, Rachna <rachna@ti.com>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/ti_tscadc.c | 432 +++++++++++++++++++++++++++++++++
include/linux/input/ti_tscadc.h | 10 +
4 files changed, 455 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/ti_tscadc.c
create mode 100644 include/linux/input/ti_tscadc.h
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 44589f5..69d367a 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -395,6 +395,18 @@ config TOUCHSCREEN_TOUCHWIN
To compile this driver as a module, choose M here: the
module will be called touchwin.
+config TOUCHSCREEN_TI_TSCADC
+ tristate "TI Touchscreen Interface"
+ depends on HAVE_CLK
+ help
+ Say Y here if you have 4/5/8 wire touchscreen controller
+ to be connected to the ADC controller on your TI SoC.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ti_tscadc.
+
config TOUCHSCREEN_ATMEL_TSADCC
tristate "Atmel Touchscreen Interface"
depends on ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 51b08b0..86b7ab6 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
+obj-$(CONFIG_TOUCHSCREEN_TI_TSCADC) += ti_tscadc.o
obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
diff --git a/drivers/input/touchscreen/ti_tscadc.c b/drivers/input/touchscreen/ti_tscadc.c
new file mode 100644
index 0000000..4f935a0
--- /dev/null
+++ b/drivers/input/touchscreen/ti_tscadc.c
@@ -0,0 +1,432 @@
+/*
+ * TI Touch Screen driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/input/ti_tscadc.h>
+
+#define TSCADC_REG_IRQEOI 0x020
+#define TSCADC_REG_IRQSTATUS 0x028
+#define TSCADC_REG_IRQENABLE 0x02C
+#define TSCADC_REG_IRQWAKEUP 0x034
+#define TSCADC_REG_CTRL 0x040
+#define TSCADC_REG_ADCFSM 0x044
+#define TSCADC_REG_CLKDIV 0x04C
+#define TSCADC_REG_SE 0x054
+#define TSCADC_REG_IDLECONFIG 0x058
+#define TSCADC_REG_CHARGECONFIG 0x05C
+#define TSCADC_REG_STEPCONFIG1 0x064
+#define TSCADC_REG_STEPDELAY1 0x068
+#define TSCADC_REG_STEPCONFIG2 0x06C
+#define TSCADC_REG_STEPDELAY2 0x070
+#define TSCADC_REG_FIFO0 0x100
+
+/* Register Bitfields */
+#define TSCADC_IRQWKUP_ENB BIT(0)
+#define TSCADC_STPENB_STEPENB (7 << 0)
+#define TSCADC_IRQENB_IRQHWPEN BIT(10)
+#define TSCADC_IRQENB_IRQEOS BIT(1)
+#define TSCADC_IRQENB_FIFO_OVERFLOW BIT(3)
+#define TSCADC_IRQENB_PENUP BIT(9)
+#define TSCADC_STEPCONFIG_MODE_HWSYNC 0x3
+#define TSCADC_STEPCONFIG_2SAMPLES_AVG BIT(2)
+#define TSCADC_STEPCONFIG_XPP BIT(5)
+#define TSCADC_STEPCONFIG_XNN BIT(6)
+#define TSCADC_STEPCONFIG_YPP BIT(7)
+#define TSCADC_STEPCONFIG_YNN BIT(8)
+#define TSCADC_STEPCONFIG_XNP BIT(9)
+#define TSCADC_STEPCONFIG_YPN BIT(10)
+#define TSCADC_STEPCONFIG_RFP_X (1 << 12)
+#define TSCADC_STEPCONFIG_RFP_4_Y (1 << 13)
+#define TSCADC_STEPCONFIG_RFP_5_Y (1 << 12)
+#define TSCADC_STEPCONFIG_RFP_8_Y (1 << 13)
+#define TSCADC_STEPCONFIG_INM (1 << 18)
+#define TSCADC_STEPCONFIG_INP_4 (1 << 20)
+#define TSCADC_STEPCONFIG_INP_5 (1 << 21)
+#define TSCADC_STEPCONFIG_INP_8_X (3 << 20)
+#define TSCADC_STEPCONFIG_INP_8_Y (1 << 21)
+#define TSCADC_STEPCONFIG_RFM_4_X (1 << 23)
+#define TSCADC_STEPCONFIG_RFM_5_X (1 << 24)
+#define TSCADC_STEPCONFIG_RFM_8_X (1 << 23)
+#define TSCADC_STEPCONFIG_RFM_Y (1 << 24)
+#define TSCADC_STEPCONFIG_OPENDLY (0xf << 0)
+#define TSCADC_STEPCONFIG_SAMPLEDLY BIT(25)
+#define TSCADC_STEPCHARGE_INM BIT(18)
+#define TSCADC_STEPCHARGE_RFM (3 << 23)
+#define TSCADC_CNTRLREG_TSCSSENB BIT(0)
+#define TSCADC_CNTRLREG_STEPID BIT(1)
+#define TSCADC_CNTRLREG_STEPCONFIGWRT BIT(2)
+#define TSCADC_CNTRLREG_TSCENB BIT(7)
+#define TSCADC_CNTRLREG_4WIRE (0x1 << 5)
+#define TSCADC_CNTRLREG_5WIRE (0x1 << 6)
+#define TSCADC_CNTRLREG_8WIRE (0x3 << 5)
+#define TSCADC_ADCFSM_STEPID 0x10
+#define TSCADC_ADCFSM_FSM BIT(5)
+
+#define ADC_CLK 3000000
+
+#define MAX_12BIT ((1 << 12) - 1)
+
+struct tscadc {
+ struct input_dev *input;
+ int wires;
+ struct clk *clk;
+ int irq;
+ void __iomem *tsc_base;
+};
+
+static unsigned int tscadc_readl(struct tscadc *ts, unsigned int reg)
+{
+ return readl(ts->tsc_base + reg);
+}
+
+static void tscadc_writel(struct tscadc *tsc, unsigned int reg,
+ unsigned int val)
+{
+ writel(val, tsc->tsc_base + reg);
+}
+
+static void tsc_step_config(struct tscadc *ts_dev)
+{
+ int stepconfig1, stepconfig2, delay;
+
+ /* Configure the Step registers */
+ stepconfig1 = TSCADC_STEPCONFIG_MODE_HWSYNC |
+ TSCADC_STEPCONFIG_2SAMPLES_AVG | TSCADC_STEPCONFIG_XPP |
+ TSCADC_STEPCONFIG_XNN | TSCADC_STEPCONFIG_INM |
+ TSCADC_STEPCONFIG_RFP_X;
+
+ stepconfig2 = TSCADC_STEPCONFIG_MODE_HWSYNC |
+ TSCADC_STEPCONFIG_2SAMPLES_AVG | TSCADC_STEPCONFIG_YNN |
+ TSCADC_STEPCONFIG_INM | TSCADC_STEPCONFIG_RFM_Y;
+ switch (ts_dev->wires) {
+ case 4:
+ stepconfig1 |= TSCADC_STEPCONFIG_INP_4 |
+ TSCADC_STEPCONFIG_RFM_4_X;
+
+ stepconfig2 |= TSCADC_STEPCONFIG_YPP |
+ TSCADC_STEPCONFIG_RFP_4_Y;
+ break;
+ case 5:
+ stepconfig1 |= TSCADC_STEPCONFIG_YPP |
+ TSCADC_STEPCONFIG_YNN |
+ TSCADC_STEPCONFIG_INP_5 |
+ TSCADC_STEPCONFIG_RFM_5_X;
+
+ stepconfig2 |= TSCADC_STEPCONFIG_XPP |
+ TSCADC_STEPCONFIG_XNP |
+ TSCADC_STEPCONFIG_YPN |
+ TSCADC_STEPCONFIG_RFP_5_Y |
+ TSCADC_STEPCONFIG_INP_5;
+ break;
+ case 8:
+ stepconfig1 |= TSCADC_STEPCONFIG_INP_8_X |
+ TSCADC_STEPCONFIG_RFM_8_X;
+
+ stepconfig2 |= TSCADC_STEPCONFIG_YPP |
+ TSCADC_STEPCONFIG_RFP_8_Y |
+ TSCADC_STEPCONFIG_INP_8_Y;
+ break;
+ }
+ delay = TSCADC_STEPCONFIG_OPENDLY | TSCADC_STEPCONFIG_SAMPLEDLY;
+
+ tscadc_writel(ts_dev, TSCADC_REG_STEPCONFIG1, stepconfig1);
+ tscadc_writel(ts_dev, TSCADC_REG_STEPDELAY1, delay);
+ tscadc_writel(ts_dev, TSCADC_REG_STEPCONFIG2, stepconfig2);
+ tscadc_writel(ts_dev, TSCADC_REG_STEPDELAY2, delay);
+
+ tscadc_writel(ts_dev, TSCADC_REG_SE, TSCADC_STPENB_STEPENB);
+}
+
+static void tsc_idle_config(struct tscadc *ts_config)
+{
+ /* Idle mode touch screen config */
+ unsigned int idleconfig;
+
+ idleconfig = TSCADC_STEPCONFIG_YNN |
+ TSCADC_STEPCONFIG_RFP_X |
+ TSCADC_STEPCONFIG_INM ;
+
+ switch (ts_config->wires) {
+ case 4:
+ idleconfig |= TSCADC_STEPCONFIG_INP_4 |
+ TSCADC_STEPCONFIG_RFM_4_X;
+ break;
+ case 5:
+ idleconfig |= TSCADC_STEPCONFIG_INP_5 |
+ TSCADC_STEPCONFIG_RFM_5_X;
+ break;
+ case 8:
+ idleconfig |= TSCADC_STEPCONFIG_INP_4 |
+ TSCADC_STEPCONFIG_RFM_8_X;
+ break;
+ }
+ tscadc_writel(ts_config, TSCADC_REG_IDLECONFIG, idleconfig);
+}
+
+static irqreturn_t tscadc_interrupt(int irq, void *dev)
+{
+ struct tscadc *ts_dev = (struct tscadc *)dev;
+ struct input_dev *input_dev = ts_dev->input;
+ unsigned int status, store, cntrlreg, irqclr = 0;
+ int absx, absy;
+ int charge, fsm;
+
+ status = tscadc_readl(ts_dev, TSCADC_REG_IRQSTATUS);
+ tscadc_writel(ts_dev, TSCADC_REG_SE, 0x0);
+
+ /* Pen touch event */
+ if (status & TSCADC_IRQENB_IRQHWPEN)
+ irqclr = TSCADC_IRQENB_IRQHWPEN;
+
+ if (status & TSCADC_IRQENB_PENUP) {
+ /* Pen up event */
+ charge = TSCADC_STEPCHARGE_INM | TSCADC_STEPCHARGE_RFM;
+ tscadc_writel(ts_dev, TSCADC_REG_CHARGECONFIG, charge);
+ input_report_key(input_dev, BTN_TOUCH, 0);
+ input_sync(input_dev);
+ tsc_idle_config(ts_dev);
+ irqclr |= TSCADC_IRQENB_PENUP;
+
+ }
+ if (status & TSCADC_IRQENB_IRQEOS) {
+ /* ADC is done with sampling, ready to read the data */
+ absx = tscadc_readl(ts_dev, TSCADC_REG_FIFO0);
+ absy = tscadc_readl(ts_dev, TSCADC_REG_FIFO0);
+
+ input_report_abs(input_dev, ABS_X, absx);
+ input_report_abs(input_dev, ABS_Y, absy);
+ input_report_key(input_dev, BTN_TOUCH, 1);
+ input_sync(input_dev);
+
+ irqclr |= TSCADC_IRQENB_IRQEOS;
+
+ }
+ if (status & TSCADC_IRQENB_FIFO_OVERFLOW) {
+ /* FIFO overflow condition */
+ cntrlreg = tscadc_readl(ts_dev, TSCADC_REG_CTRL);
+ cntrlreg &= ~TSCADC_CNTRLREG_TSCSSENB;
+ tscadc_writel(ts_dev, TSCADC_REG_CTRL, cntrlreg);
+
+ irqclr |= TSCADC_IRQENB_FIFO_OVERFLOW;
+ }
+
+ tscadc_writel(ts_dev, TSCADC_REG_IRQSTATUS, irqclr);
+ fsm = tscadc_readl(ts_dev, TSCADC_REG_ADCFSM);
+ if ((fsm & TSCADC_ADCFSM_FSM) &&
+ (fsm & TSCADC_ADCFSM_STEPID)) {
+ store = tscadc_readl(ts_dev, TSCADC_REG_CTRL);
+ store |= TSCADC_CNTRLREG_TSCSSENB;
+ tscadc_writel(ts_dev, TSCADC_REG_CTRL, store);
+ }
+
+ /* check pending interrupts */
+ tscadc_writel(ts_dev, TSCADC_REG_IRQEOI, 0x0);
+
+ tscadc_writel(ts_dev, TSCADC_REG_SE, TSCADC_STPENB_STEPENB);
+ return IRQ_HANDLED;
+}
+
+/*
+* The functions for inserting/removing driver as a module.
+*/
+
+static int __devinit tscadc_probe(struct platform_device *pdev)
+{
+ struct tscadc *ts_dev;
+ struct input_dev *input_dev;
+ int err;
+ int clk_value;
+ int clock_rate, irqenable, ctrl;
+ struct tsc_data *pdata = pdev->dev.platform_data;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource defined.\n");
+ return -EINVAL;
+ }
+
+ /* Allocate memory for device */
+ ts_dev = kzalloc(sizeof(struct tscadc), GFP_KERNEL);
+ if (!ts_dev) {
+ dev_err(&pdev->dev, "failed to allocate memory.\n");
+ return -ENOMEM;
+ }
+
+ ts_dev->irq = platform_get_irq(pdev, 0);
+ if (ts_dev->irq < 0) {
+ dev_err(&pdev->dev, "no irq ID is specified.\n");
+ err = -ENODEV;
+ goto err_free_mem;
+ }
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate input device.\n");
+ err = -ENOMEM;
+ goto err_free_mem;
+ }
+ ts_dev->input = input_dev;
+
+ ts_dev->tsc_base = ioremap(res->start, resource_size(res));
+ if (!ts_dev->tsc_base) {
+ dev_err(&pdev->dev, "failed to map registers.\n");
+ err = -ENOMEM;
+ goto err_release_mem;
+ }
+
+ err = request_irq(ts_dev->irq, tscadc_interrupt, IRQF_DISABLED,
+ pdev->dev.driver->name, ts_dev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to allocate irq.\n");
+ goto err_unmap_regs;
+ }
+
+ ts_dev->clk = clk_get(&pdev->dev, "tsc_clk");
+ if (IS_ERR(ts_dev->clk)) {
+ dev_err(&pdev->dev, "failed to get ts_clk\n");
+ err = PTR_ERR(ts_dev->clk);
+ goto err_free_irq;
+ }
+ clk_enable(ts_dev->clk);
+
+ clock_rate = clk_get_rate(ts_dev->clk);
+ clk_value = clock_rate / ADC_CLK;
+ if (clk_value < 7) {
+ dev_err(&pdev->dev, "clock input less than min clock requirement\n");
+ goto err_fail;
+ }
+ /* TSCADC_CLKDIV needs to be configured to the value minus 1 */
+ clk_value = clk_value - 1;
+ tscadc_writel(ts_dev, TSCADC_REG_CLKDIV, clk_value);
+
+ /* Enable wake-up of the SoC using touchscreen */
+ tscadc_writel(ts_dev, TSCADC_REG_IRQWAKEUP, TSCADC_IRQWKUP_ENB);
+
+ ts_dev->wires = pdata->wires;
+
+ /* Set the control register bits */
+ ctrl = TSCADC_CNTRLREG_STEPCONFIGWRT |
+ TSCADC_CNTRLREG_TSCENB |
+ TSCADC_CNTRLREG_STEPID;
+ switch (ts_dev->wires) {
+ case 4:
+ ctrl |= TSCADC_CNTRLREG_4WIRE;
+ break;
+ case 5:
+ ctrl |= TSCADC_CNTRLREG_5WIRE;
+ break;
+ case 8:
+ ctrl |= TSCADC_CNTRLREG_8WIRE;
+ break;
+ }
+ tscadc_writel(ts_dev, TSCADC_REG_CTRL, ctrl);
+
+ /* Set register bits for Idel Config Mode */
+ tsc_idle_config(ts_dev);
+
+ /* IRQ Enable */
+ irqenable = TSCADC_IRQENB_IRQHWPEN |
+ TSCADC_IRQENB_IRQEOS |
+ TSCADC_IRQENB_PENUP | TSCADC_IRQENB_FIFO_OVERFLOW;
+ tscadc_writel(ts_dev, TSCADC_REG_IRQENABLE, irqenable);
+
+ tsc_step_config(ts_dev);
+
+ ctrl |= TSCADC_CNTRLREG_TSCSSENB;
+ tscadc_writel(ts_dev, TSCADC_REG_CTRL, ctrl);
+
+ input_dev->name = "ti-tsc-adcc";
+ input_dev->dev.parent = &pdev->dev;
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+ input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
+
+ /* register to the input system */
+ err = input_register_device(input_dev);
+ if (err)
+ goto err_fail;
+
+ return 0;
+
+err_fail:
+ clk_disable(ts_dev->clk);
+ clk_put(ts_dev->clk);
+err_free_irq:
+ free_irq(ts_dev->irq, ts_dev);
+err_unmap_regs:
+ iounmap(ts_dev->tsc_base);
+err_release_mem:
+ release_mem_region(res->start, resource_size(res));
+ input_free_device(ts_dev->input);
+err_free_mem:
+ kfree(ts_dev);
+ return err;
+}
+
+static int __devexit tscadc_remove(struct platform_device *pdev)
+{
+ struct tscadc *ts_dev = dev_get_drvdata(&pdev->dev);
+ struct resource *res;
+
+ free_irq(ts_dev->irq, ts_dev);
+
+ input_unregister_device(ts_dev->input);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ iounmap(ts_dev->tsc_base);
+ release_mem_region(res->start, resource_size(res));
+
+ clk_disable(ts_dev->clk);
+ clk_put(ts_dev->clk);
+
+ kfree(ts_dev);
+
+ return 0;
+}
+
+static struct platform_driver ti_tsc_driver = {
+ .probe = tscadc_probe,
+ .remove = __devexit_p(tscadc_remove),
+ .driver = {
+ .name = "tsc",
+ },
+};
+
+static int __init ti_tsc_init(void)
+{
+ return platform_driver_register(&ti_tsc_driver);
+}
+
+static void __exit ti_tsc_exit(void)
+{
+ platform_driver_unregister(&ti_tsc_driver);
+}
+
+module_init(ti_tsc_init);
+module_exit(ti_tsc_exit);
diff --git a/include/linux/input/ti_tscadc.h b/include/linux/input/ti_tscadc.h
new file mode 100644
index 0000000..29f87db
--- /dev/null
+++ b/include/linux/input/ti_tscadc.h
@@ -0,0 +1,10 @@
+/**
+ * struct tsc_data Touchscreen wire configuration
+ * @wires: Wires refer to application modes
+ * i.e. 4/5/8 wire touchscreen support
+ * on the platform
+ */
+
+struct tsc_data {
+ int wires;
+};
--
1.6.2.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* RE: [PATCH v4] input: add support for TI Touchscreen controller.
[not found] ` <CAM=Q2ctN-rGkWZUsDnuiwFANjyknq56ShyWvn60H9ihPb2XvrA@mail.gmail.com>
@ 2011-09-21 12:34 ` Patil, Rachna
0 siblings, 0 replies; 2+ messages in thread
From: Patil, Rachna @ 2011-09-21 12:34 UTC (permalink / raw)
To: Shubhrajyoti Datta
Cc: linux-input@vger.kernel.org, Dmitry Torokhov, Dmitry Torokhov
Hi Shubhrajyoti,
Sorry about the late reply. I was stuck with some other work.
I have also received the real hardware for the respective driver.
There are some changes. I will soon apply a patch for the same.
On Thu, Aug 11, 2011 at 19:22:01, Shubhrajyoti Datta wrote:
>
> Hi Rachna,
>
>
> On Thu, Aug 11, 2011 at 6:01 PM, Patil, Rachna <rachna@ti.com> wrote:
>
>
> This patch adds support for TI's touchscreen
> controller for a 4/5/8 wire resistive panel
> that is directly fed to the ADC.
>
> This touchscreen controller will be part of
> an upcoming TI SoC and has been tested on
> an emulation platform.
>
> ChangeLog:
> v2: fixed comments from Dimitry
> v3: made the driver depend on HAVE_CLK for build
> v4: error handling added
>
> Signed-off-by: Patil, Rachna <rachna@ti.com>
> ---
> drivers/input/touchscreen/Kconfig | 12 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/ti_tscadc.c | 432
> +++++++++++++++++++++++++++++++++
> include/linux/input/ti_tscadc.h | 10 +
> 4 files changed, 455 insertions(+), 0 deletions(-)
> create mode 100644 drivers/input/touchscreen/ti_tscadc.c
> create mode 100644 include/linux/input/ti_tscadc.h
>
> diff --git a/drivers/input/touchscreen/Kconfig
> b/drivers/input/touchscreen/Kconfig
> index 44589f5..69d367a 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -395,6 +395,18 @@ config TOUCHSCREEN_TOUCHWIN
> To compile this driver as a module, choose M here: the
> module will be called touchwin.
>
> +config TOUCHSCREEN_TI_TSCADC
> + tristate "TI Touchscreen Interface"
> + depends on HAVE_CLK
> + help
> + Say Y here if you have 4/5/8 wire touchscreen
> controller
> + to be connected to the ADC controller on your TI SoC.
> +
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ti_tscadc.
> +
> config TOUCHSCREEN_ATMEL_TSADCC
> tristate "Atmel Touchscreen Interface"
> depends on ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
> diff --git a/drivers/input/touchscreen/Makefile
> b/drivers/input/touchscreen/Makefile
> index 51b08b0..86b7ab6 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -41,6 +41,7 @@ obj-$(CONFIG_TOUCHSCREEN_QT602240) +=
> qt602240_ts.o
> obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
> obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
> obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
> +obj-$(CONFIG_TOUCHSCREEN_TI_TSCADC) += ti_tscadc.o
> obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
> obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
> obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
> diff --git a/drivers/input/touchscreen/ti_tscadc.c
> b/drivers/input/touchscreen/ti_tscadc.c
> new file mode 100644
> index 0000000..4f935a0
> --- /dev/null
> +++ b/drivers/input/touchscreen/ti_tscadc.c
> @@ -0,0 +1,432 @@
> +/*
> + * TI Touch Screen driver
> + *
> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
> + *
> + * 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/init.h>
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/input.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/clk.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/input/ti_tscadc.h>
> +
> +#define TSCADC_REG_IRQEOI 0x020
> +#define TSCADC_REG_IRQSTATUS 0x028
> +#define TSCADC_REG_IRQENABLE 0x02C
> +#define TSCADC_REG_IRQWAKEUP 0x034
> +#define TSCADC_REG_CTRL 0x040
> +#define TSCADC_REG_ADCFSM 0x044
> +#define TSCADC_REG_CLKDIV 0x04C
> +#define TSCADC_REG_SE 0x054
> +#define TSCADC_REG_IDLECONFIG 0x058
> +#define TSCADC_REG_CHARGECONFIG 0x05C
> +#define TSCADC_REG_STEPCONFIG1 0x064
> +#define TSCADC_REG_STEPDELAY1 0x068
> +#define TSCADC_REG_STEPCONFIG2 0x06C
> +#define TSCADC_REG_STEPDELAY2 0x070
> +#define TSCADC_REG_FIFO0 0x100
> +
> +/* Register Bitfields */
> +#define TSCADC_IRQWKUP_ENB BIT(0)
> +#define TSCADC_STPENB_STEPENB (7 << 0)
> +#define TSCADC_IRQENB_IRQHWPEN BIT(10)
> +#define TSCADC_IRQENB_IRQEOS BIT(1)
> +#define TSCADC_IRQENB_FIFO_OVERFLOW BIT(3)
> +#define TSCADC_IRQENB_PENUP BIT(9)
> +#define TSCADC_STEPCONFIG_MODE_HWSYNC 0x3
> +#define TSCADC_STEPCONFIG_2SAMPLES_AVG BIT(2)
> +#define TSCADC_STEPCONFIG_XPP BIT(5)
> +#define TSCADC_STEPCONFIG_XNN BIT(6)
> +#define TSCADC_STEPCONFIG_YPP BIT(7)
> +#define TSCADC_STEPCONFIG_YNN BIT(8)
> +#define TSCADC_STEPCONFIG_XNP BIT(9)
> +#define TSCADC_STEPCONFIG_YPN BIT(10)
>
>
>
> Any particular reason for having some as BIT and some as 1 << xx
No particular reason. I will fix this.
>
>
>
> +#define TSCADC_STEPCONFIG_RFP_X (1 << 12)
> +#define TSCADC_STEPCONFIG_RFP_4_Y (1 << 13)
> +#define TSCADC_STEPCONFIG_RFP_5_Y (1 << 12)
> +#define TSCADC_STEPCONFIG_RFP_8_Y (1 << 13)
> +#define TSCADC_STEPCONFIG_INM (1 << 18)
> +#define TSCADC_STEPCONFIG_INP_4 (1 << 20)
> +#define TSCADC_STEPCONFIG_INP_5 (1 << 21)
> +#define TSCADC_STEPCONFIG_INP_8_X (3 << 20)
> +#define TSCADC_STEPCONFIG_INP_8_Y (1 << 21)
> +#define TSCADC_STEPCONFIG_RFM_4_X (1 << 23)
> +#define TSCADC_STEPCONFIG_RFM_5_X (1 << 24)
> +#define TSCADC_STEPCONFIG_RFM_8_X (1 << 23)
> +#define TSCADC_STEPCONFIG_RFM_Y (1 << 24)
> +#define TSCADC_STEPCONFIG_OPENDLY (0xf << 0)
> +#define TSCADC_STEPCONFIG_SAMPLEDLY BIT(25)
> +#define TSCADC_STEPCHARGE_INM BIT(18)
> +#define TSCADC_STEPCHARGE_RFM (3 << 23)
> +#define TSCADC_CNTRLREG_TSCSSENB BIT(0)
> +#define TSCADC_CNTRLREG_STEPID BIT(1)
> +#define TSCADC_CNTRLREG_STEPCONFIGWRT BIT(2)
> +#define TSCADC_CNTRLREG_TSCENB BIT(7)
> +#define TSCADC_CNTRLREG_4WIRE (0x1 << 5)
> +#define TSCADC_CNTRLREG_5WIRE (0x1 << 6)
> +#define TSCADC_CNTRLREG_8WIRE (0x3 << 5)
> +#define TSCADC_ADCFSM_STEPID 0x10
> +#define TSCADC_ADCFSM_FSM BIT(5)
> +
> +#define ADC_CLK 3000000
> +
> +#define MAX_12BIT ((1 << 12) - 1)
> +
> +struct tscadc {
> + struct input_dev *input;
> + int wires;
> + struct clk *clk;
> + int irq;
> + void __iomem *tsc_base;
> +};
> +
> +static unsigned int tscadc_readl(struct tscadc *ts, unsigned int reg)
> +{
> + return readl(ts->tsc_base + reg);
> +}
> +
> +static void tscadc_writel(struct tscadc *tsc, unsigned int reg,
> + unsigned int val)
> +{
> + writel(val, tsc->tsc_base + reg);
> +}
> +
> +static void tsc_step_config(struct tscadc *ts_dev)
> +{
> + int stepconfig1, stepconfig2, delay;
> +
> + /* Configure the Step registers */
> + stepconfig1 = TSCADC_STEPCONFIG_MODE_HWSYNC |
> + TSCADC_STEPCONFIG_2SAMPLES_AVG |
> TSCADC_STEPCONFIG_XPP |
> + TSCADC_STEPCONFIG_XNN |
> TSCADC_STEPCONFIG_INM |
> + TSCADC_STEPCONFIG_RFP_X;
> +
> + stepconfig2 = TSCADC_STEPCONFIG_MODE_HWSYNC |
> + TSCADC_STEPCONFIG_2SAMPLES_AVG |
> TSCADC_STEPCONFIG_YNN |
> + TSCADC_STEPCONFIG_INM |
> TSCADC_STEPCONFIG_RFM_Y;
> + switch (ts_dev->wires) {
> + case 4:
> + stepconfig1 |= TSCADC_STEPCONFIG_INP_4 |
> + TSCADC_STEPCONFIG_RFM_4_X;
> +
> + stepconfig2 |= TSCADC_STEPCONFIG_YPP |
> + TSCADC_STEPCONFIG_RFP_4_Y;
> + break;
> + case 5:
> + stepconfig1 |= TSCADC_STEPCONFIG_YPP |
> + TSCADC_STEPCONFIG_YNN |
> + TSCADC_STEPCONFIG_INP_5 |
> + TSCADC_STEPCONFIG_RFM_5_X;
> +
> + stepconfig2 |= TSCADC_STEPCONFIG_XPP |
> + TSCADC_STEPCONFIG_XNP |
> + TSCADC_STEPCONFIG_YPN |
> + TSCADC_STEPCONFIG_RFP_5_Y |
> + TSCADC_STEPCONFIG_INP_5;
> + break;
> + case 8:
> + stepconfig1 |= TSCADC_STEPCONFIG_INP_8_X |
> + TSCADC_STEPCONFIG_RFM_8_X;
> +
> + stepconfig2 |= TSCADC_STEPCONFIG_YPP |
> + TSCADC_STEPCONFIG_RFP_8_Y |
> + TSCADC_STEPCONFIG_INP_8_Y;
> + break;
> + }
> + delay = TSCADC_STEPCONFIG_OPENDLY |
> TSCADC_STEPCONFIG_SAMPLEDLY;
> +
> + tscadc_writel(ts_dev, TSCADC_REG_STEPCONFIG1,
> stepconfig1);
> + tscadc_writel(ts_dev, TSCADC_REG_STEPDELAY1, delay);
> + tscadc_writel(ts_dev, TSCADC_REG_STEPCONFIG2,
> stepconfig2);
> + tscadc_writel(ts_dev, TSCADC_REG_STEPDELAY2, delay);
> +
> + tscadc_writel(ts_dev, TSCADC_REG_SE,
> TSCADC_STPENB_STEPENB);
> +}
> +
> +static void tsc_idle_config(struct tscadc *ts_config)
> +{
> + /* Idle mode touch screen config */
> + unsigned int idleconfig;
> +
> + idleconfig = TSCADC_STEPCONFIG_YNN |
> + TSCADC_STEPCONFIG_RFP_X |
> + TSCADC_STEPCONFIG_INM ;
> +
> + switch (ts_config->wires) {
> + case 4:
> + idleconfig |= TSCADC_STEPCONFIG_INP_4 |
> + TSCADC_STEPCONFIG_RFM_4_X;
> + break;
> + case 5:
> + idleconfig |= TSCADC_STEPCONFIG_INP_5 |
> + TSCADC_STEPCONFIG_RFM_5_X;
> + break;
> + case 8:
> + idleconfig |= TSCADC_STEPCONFIG_INP_4 |
> + TSCADC_STEPCONFIG_RFM_8_X;
> + break;
> + }
> + tscadc_writel(ts_config, TSCADC_REG_IDLECONFIG,
> idleconfig);
> +}
> +
> +static irqreturn_t tscadc_interrupt(int irq, void *dev)
> +{
> + struct tscadc *ts_dev = (struct tscadc *)dev;
> + struct input_dev *input_dev = ts_dev->input;
> + unsigned int status, store, cntrlreg, irqclr
> = 0;
> + int absx, absy;
> + int charge, fsm;
> +
> + status = tscadc_readl(ts_dev, TSCADC_REG_IRQSTATUS);
> + tscadc_writel(ts_dev, TSCADC_REG_SE, 0x0);
> +
> + /* Pen touch event */
> + if (status & TSCADC_IRQENB_IRQHWPEN)
> + irqclr = TSCADC_IRQENB_IRQHWPEN;
> +
> + if (status & TSCADC_IRQENB_PENUP) {
> + /* Pen up event */
> + charge = TSCADC_STEPCHARGE_INM |
> TSCADC_STEPCHARGE_RFM;
> + tscadc_writel(ts_dev, TSCADC_REG_CHARGECONFIG,
> charge);
> + input_report_key(input_dev, BTN_TOUCH, 0);
> + input_sync(input_dev);
> + tsc_idle_config(ts_dev);
> + irqclr |= TSCADC_IRQENB_PENUP;
> +
> + }
> + if (status & TSCADC_IRQENB_IRQEOS) {
> + /* ADC is done with sampling, ready to read the
> data */
> + absx = tscadc_readl(ts_dev, TSCADC_REG_FIFO0);
> + absy = tscadc_readl(ts_dev, TSCADC_REG_FIFO0);
> +
> + input_report_abs(input_dev, ABS_X, absx);
> + input_report_abs(input_dev, ABS_Y, absy);
> + input_report_key(input_dev, BTN_TOUCH, 1);
> + input_sync(input_dev);
> +
> + irqclr |= TSCADC_IRQENB_IRQEOS;
> +
> + }
> + if (status & TSCADC_IRQENB_FIFO_OVERFLOW) {
> + /* FIFO overflow condition */
> + cntrlreg = tscadc_readl(ts_dev,
> TSCADC_REG_CTRL);
> + cntrlreg &= ~TSCADC_CNTRLREG_TSCSSENB;
> + tscadc_writel(ts_dev, TSCADC_REG_CTRL,
> cntrlreg);
> +
> + irqclr |= TSCADC_IRQENB_FIFO_OVERFLOW;
> + }
> +
> + tscadc_writel(ts_dev, TSCADC_REG_IRQSTATUS, irqclr);
> + fsm = tscadc_readl(ts_dev, TSCADC_REG_ADCFSM);
> + if ((fsm & TSCADC_ADCFSM_FSM) &&
> + (fsm & TSCADC_ADCFSM_STEPID)) {
> + store = tscadc_readl(ts_dev, TSCADC_REG_CTRL);
> + store |= TSCADC_CNTRLREG_TSCSSENB;
> + tscadc_writel(ts_dev, TSCADC_REG_CTRL, store);
> + }
> +
> + /* check pending interrupts */
> + tscadc_writel(ts_dev, TSCADC_REG_IRQEOI, 0x0);
> +
> + tscadc_writel(ts_dev, TSCADC_REG_SE,
> TSCADC_STPENB_STEPENB);
> + return IRQ_HANDLED;
> +}
> +
> +/*
> +* The functions for inserting/removing driver as a module.
> +*/
> +
> +static int __devinit tscadc_probe(struct platform_device *pdev)
> +{
> + struct tscadc *ts_dev;
> + struct input_dev *input_dev;
> + int err;
> + int clk_value;
> + int clock_rate, irqenable,
> ctrl;
> + struct tsc_data *pdata =
> pdev->dev.platform_data;
> + struct resource *res;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "no memory resource
> defined.\n");
> + return -EINVAL;
> + }
> +
> + /* Allocate memory for device */
> + ts_dev = kzalloc(sizeof(struct tscadc), GFP_KERNEL);
> + if (!ts_dev) {
> + dev_err(&pdev->dev, "failed to allocate
> memory.\n");
> + return -ENOMEM;
> + }
> +
> + ts_dev->irq = platform_get_irq(pdev, 0);
> + if (ts_dev->irq < 0) {
> + dev_err(&pdev->dev, "no irq ID is
> specified.\n");
> + err = -ENODEV;
> + goto err_free_mem;
> + }
> +
> + input_dev = input_allocate_device();
> + if (!input_dev) {
> + dev_err(&pdev->dev, "failed to allocate input
> device.\n");
> + err = -ENOMEM;
> + goto err_free_mem;
> + }
> + ts_dev->input = input_dev;
> +
> + ts_dev->tsc_base = ioremap(res->start,
> resource_size(res));
> + if (!ts_dev->tsc_base) {
> + dev_err(&pdev->dev, "failed to map
> registers.\n");
> + err = -ENOMEM;
> + goto err_release_mem;
> + }
> +
> + err = request_irq(ts_dev->irq, tscadc_interrupt,
> IRQF_DISABLED,
> + pdev->dev.driver->name, ts_dev);
>
>
>
> Why not use threaded irq instead?
I didn't see a lot of interrupt load, but I can do this.
>
>
>
> + if (err) {
> + dev_err(&pdev->dev, "failed to allocate
> irq.\n");
> + goto err_unmap_regs;
> + }
> +
> + ts_dev->clk = clk_get(&pdev->dev, "tsc_clk");
> + if (IS_ERR(ts_dev->clk)) {
> + dev_err(&pdev->dev, "failed to get ts_clk\n");
> + err = PTR_ERR(ts_dev->clk);
> + goto err_free_irq;
> + }
> + clk_enable(ts_dev->clk);
>
>
>
> Could we use runtime apis?
We haven't really done power management on this
driver yet. Will add it in future. Hope this is
not really a must for the driver to get in.
>
>
>
> +
> + clock_rate = clk_get_rate(ts_dev->clk);
> + clk_value = clock_rate / ADC_CLK;
> + if (clk_value < 7) {
> + dev_err(&pdev->dev, "clock input less than min
> clock requirement\n");
> + goto err_fail;
> + }
> + /* TSCADC_CLKDIV needs to be configured to the value
> minus 1 */
> + clk_value = clk_value - 1;
> + tscadc_writel(ts_dev, TSCADC_REG_CLKDIV, clk_value);
> +
> + /* Enable wake-up of the SoC using touchscreen */
> + tscadc_writel(ts_dev, TSCADC_REG_IRQWAKEUP,
> TSCADC_IRQWKUP_ENB);
> +
> + ts_dev->wires = pdata->wires;
> +
> + /* Set the control register bits */
> + ctrl = TSCADC_CNTRLREG_STEPCONFIGWRT |
> + TSCADC_CNTRLREG_TSCENB |
> + TSCADC_CNTRLREG_STEPID;
> + switch (ts_dev->wires) {
> + case 4:
> + ctrl |= TSCADC_CNTRLREG_4WIRE;
> + break;
> + case 5:
> + ctrl |= TSCADC_CNTRLREG_5WIRE;
> + break;
> + case 8:
> + ctrl |= TSCADC_CNTRLREG_8WIRE;
> + break;
> + }
> + tscadc_writel(ts_dev, TSCADC_REG_CTRL, ctrl);
> +
> + /* Set register bits for Idel Config Mode */
> + tsc_idle_config(ts_dev);
> +
> + /* IRQ Enable */
> + irqenable = TSCADC_IRQENB_IRQHWPEN |
> + TSCADC_IRQENB_IRQEOS |
> + TSCADC_IRQENB_PENUP |
> TSCADC_IRQENB_FIFO_OVERFLOW;
> + tscadc_writel(ts_dev, TSCADC_REG_IRQENABLE, irqenable);
> +
> + tsc_step_config(ts_dev);
> +
> + ctrl |= TSCADC_CNTRLREG_TSCSSENB;
> + tscadc_writel(ts_dev, TSCADC_REG_CTRL, ctrl);
> +
> + input_dev->name = "ti-tsc-adcc";
> + input_dev->dev.parent = &pdev->dev;
> +
> + input_dev->evbit[0] = BIT_MASK(EV_KEY) |
> BIT_MASK(EV_ABS);
> + input_dev->keybit[BIT_WORD(BTN_TOUCH)] =
> BIT_MASK(BTN_TOUCH);
> +
> + input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0,
> 0);
> + input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0,
> 0);
> +
> + /* register to the input system */
> + err = input_register_device(input_dev);
> + if (err)
> + goto err_fail;
> +
> + return 0;
> +
> +err_fail:
> + clk_disable(ts_dev->clk);
> + clk_put(ts_dev->clk);
> +err_free_irq:
> + free_irq(ts_dev->irq, ts_dev);
> +err_unmap_regs:
> + iounmap(ts_dev->tsc_base);
> +err_release_mem:
> + release_mem_region(res->start, resource_size(res));
> + input_free_device(ts_dev->input);
> +err_free_mem:
> + kfree(ts_dev);
> + return err;
> +}
> +
> +static int __devexit tscadc_remove(struct platform_device
> *pdev)
> +{
> + struct tscadc *ts_dev =
> dev_get_drvdata(&pdev->dev);
> + struct resource *res;
> +
> + free_irq(ts_dev->irq, ts_dev);
> +
> + input_unregister_device(ts_dev->input);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + iounmap(ts_dev->tsc_base);
> + release_mem_region(res->start, resource_size(res));
> +
> + clk_disable(ts_dev->clk);
> + clk_put(ts_dev->clk);
> +
> + kfree(ts_dev);
> +
> + return 0;
> +}
> +
> +static struct platform_driver ti_tsc_driver = {
> + .probe = tscadc_probe,
> + .remove = __devexit_p(tscadc_remove),
> + .driver = {
> + .name = "tsc",
> + },
> +};
> +
> +static int __init ti_tsc_init(void)
> +{
> + return platform_driver_register(&ti_tsc_driver);
> +}
> +
> +static void __exit ti_tsc_exit(void)
> +{
> + platform_driver_unregister(&ti_tsc_driver);
> +}
> +
> +module_init(ti_tsc_init);
> +module_exit(ti_tsc_exit);
> diff --git a/include/linux/input/ti_tscadc.h b/include/linux/input/ti_tscadc.h
> new file mode 100644
> index 0000000..29f87db
> --- /dev/null
> +++ b/include/linux/input/ti_tscadc.h
> @@ -0,0 +1,10 @@
> +/**
> + * struct tsc_data Touchscreen wire configuration
> + * @wires: Wires refer to application modes
> + * i.e. 4/5/8 wire touchscreen support
> + * on the platform
> + */
> +
> +struct tsc_data {
> + int wires;
> +};
> --
> 1.6.2.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-input" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at
> http://vger.kernel.org/majordomo-info.html
>
Regards,
Rachna.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2011-09-21 12:35 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2011-08-11 12:31 [PATCH v4] input: add support for TI Touchscreen controller Patil, Rachna
[not found] ` <CAM=Q2ctN-rGkWZUsDnuiwFANjyknq56ShyWvn60H9ihPb2XvrA@mail.gmail.com>
2011-09-21 12:34 ` Patil, Rachna
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