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@xxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
