Hi Dmitry, On Tue, Nov 22, 2011 at 17:42:27, Patil, Rachna wrote: > From: Rachna Patil <rachna@xxxxxx> > > 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 AM335x TI SoC. The TRM can be found at: > http://www.ti.com/lit/ug/spruh73a/spruh73a.pdf > > Signed-off-by: Patil, Rachna <rachna@xxxxxx> > --- > There was an earlier version of this driver submitted. > As the patch has evolved tremendously, I am not submitting this patch as v2. > I had submitted this patch to the Linux input community, however it does not appear in the archive. Did you receive a copy of this? > drivers/input/touchscreen/Kconfig | 12 + > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/ti_tscadc.c | 491 +++++++++++++++++++++++++++++++++ > include/linux/input/ti_tscadc.h | 12 + > 4 files changed, 516 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 cabd9e5..de4ee06 100644 > --- a/drivers/input/touchscreen/Kconfig > +++ b/drivers/input/touchscreen/Kconfig > @@ -407,6 +407,18 @@ 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 ARCH_OMAP2PLUS > + help > + Say Y here if you have 4/5/8 wire touchscreen controller > + to be connected to the ADC controller on your TI AM335x 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 282d6f7..e353bcb 100644 > --- a/drivers/input/touchscreen/Makefile > +++ b/drivers/input/touchscreen/Makefile > @@ -42,6 +42,7 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o > obj-$(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..937dea2 > --- /dev/null > +++ b/drivers/input/touchscreen/ti_tscadc.c > @@ -0,0 +1,491 @@ > +/* > + * 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> > +#include <linux/delay.h> > + > +#define REG_IRQEOI 0x020 > +#define REG_RAWIRQSTATUS 0x024 > +#define REG_IRQSTATUS 0x028 > +#define REG_IRQENABLE 0x02C > +#define REG_IRQWAKEUP 0x034 > +#define REG_CTRL 0x040 > +#define REG_ADCFSM 0x044 > +#define REG_CLKDIV 0x04C > +#define REG_SE 0x054 > +#define REG_IDLECONFIG 0x058 > +#define REG_CHARGECONFIG 0x05C > +#define REG_CHARGEDELAY 0x060 > +#define REG_STEPCONFIG(n) (0x64 + ((n - 1) * 8)) > +#define REG_STEPDELAY(n) (0x68 + ((n - 1) * 8)) > +#define REG_STEPCONFIG13 0x0C4 > +#define REG_STEPDELAY13 0x0C8 > +#define REG_STEPCONFIG14 0x0CC > +#define REG_STEPDELAY14 0x0D0 > +#define REG_FIFO0CNT 0xE4 > +#define REG_FIFO1THR 0xF4 > +#define REG_FIFO0 0x100 > +#define REG_FIFO1 0x200 > + > +/* Register Bitfields */ > +#define IRQWKUP_ENB BIT(0) > +#define STPENB_STEPENB 0x7FFF > +#define IRQENB_FIFO1THRES BIT(5) > +#define IRQENB_PENUP BIT(9) > +#define STEPCONFIG_MODE_HWSYNC 0x2 > +#define STEPCONFIG_SAMPLES_AVG (1 << 4) > +#define STEPCONFIG_XPP (1 << 5) > +#define STEPCONFIG_XNN (1 << 6) > +#define STEPCONFIG_YPP (1 << 7) > +#define STEPCONFIG_YNN (1 << 8) > +#define STEPCONFIG_XNP (1 << 9) > +#define STEPCONFIG_YPN (1 << 10) > +#define STEPCONFIG_INM (1 << 18) > +#define STEPCONFIG_INP (1 << 20) > +#define STEPCONFIG_INP_5 (1 << 21) > +#define STEPCONFIG_FIFO1 (1 << 26) > +#define STEPCONFIG_OPENDLY 0x90 > +#define STEPCONFIG_Z1 (3 << 19) > +#define STEPIDLE_INP (1 << 22) > +#define STEPCHARGE_RFP (1 << 12) > +#define STEPCHARGE_INM (1 << 15) > +#define STEPCHARGE_INP (1 << 19) > +#define STEPCHARGE_RFM (1 << 23) > +#define STEPCHARGE_DELAY 0x1 > +#define CNTRLREG_TSCSSENB (1 << 0) > +#define CNTRLREG_STEPID (1 << 1) > +#define CNTRLREG_STEPCONFIGWRT (1 << 2) > +#define CNTRLREG_4WIRE (1 << 5) > +#define CNTRLREG_5WIRE (1 << 6) > +#define CNTRLREG_8WIRE (3 << 5) > +#define CNTRLREG_TSCENB (1 << 7) > +#define ADCFSM_STEPID 0x10 > + > +#define SEQ_SETTLE 315 > +#define ADC_CLK 3000000 > +#define MAX_12BIT ((1 << 12) - 1) > + > +struct tscadc { > + struct input_dev *input; > + int wires; > + int x_plate_resistance; > + struct clk *tsc_ick; > + int irq; > + void __iomem *tsc_base; > +}; > + > +int pen = 1; > +unsigned int bckup_x = 0, bckup_y = 0; > + > +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) { > + unsigned int config; > + int i; > + > + /* Configure the Step registers */ > + > + config = STEPCONFIG_MODE_HWSYNC | > + STEPCONFIG_SAMPLES_AVG | STEPCONFIG_XPP; > + switch (ts_dev->wires) { > + case 4: > + config |= STEPCONFIG_INP | > + STEPCONFIG_XNN; > + break; > + case 5: > + config |= STEPCONFIG_YNN | > + STEPCONFIG_INP_5 | STEPCONFIG_XNN | > + STEPCONFIG_YPP; > + break; > + case 8: > + config |= STEPCONFIG_INP | > + STEPCONFIG_XNN; > + break; > + } > + for (i = 1; i < 7; i++) { > + tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); > + tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); > + } > + > + config = 0; > + config = STEPCONFIG_MODE_HWSYNC | > + STEPCONFIG_SAMPLES_AVG | STEPCONFIG_YNN | > + STEPCONFIG_INM | STEPCONFIG_FIFO1; > + switch (ts_dev->wires) { > + case 4: > + config |= STEPCONFIG_YPP; > + break; > + case 5: > + config |= STEPCONFIG_XPP | STEPCONFIG_INP_5 | > + STEPCONFIG_XNP | STEPCONFIG_YPN; > + break; > + case 8: > + config |= STEPCONFIG_YPP; > + break; > + } > + for (i = 7; i < 13; i++) { > + tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); > + tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); > + } > + > + config = 0; > + /* Charge step configuration */ > + config = STEPCONFIG_XPP | STEPCONFIG_YNN | > + STEPCHARGE_RFP | STEPCHARGE_RFM | > + STEPCHARGE_INM | STEPCHARGE_INP; > + > + tscadc_writel(ts_dev, REG_CHARGECONFIG, config); > + tscadc_writel(ts_dev, REG_CHARGEDELAY, STEPCHARGE_DELAY); > + > + config = 0; > + /* Configure to calculate pressure */ > + config = STEPCONFIG_MODE_HWSYNC | > + STEPCONFIG_SAMPLES_AVG | STEPCONFIG_YPP | > + STEPCONFIG_XNN | STEPCONFIG_INM; > + tscadc_writel(ts_dev, REG_STEPCONFIG13, config); > + tscadc_writel(ts_dev, REG_STEPDELAY13, STEPCONFIG_OPENDLY); > + > + config |= STEPCONFIG_Z1 | STEPCONFIG_FIFO1; > + tscadc_writel(ts_dev, REG_STEPCONFIG14, config); > + tscadc_writel(ts_dev, REG_STEPDELAY14, STEPCONFIG_OPENDLY); > + > + tscadc_writel(ts_dev, REG_SE, STPENB_STEPENB); } > + > +static void tsc_idle_config(struct tscadc *ts_config) { > + unsigned int idleconfig; > + > + idleconfig = STEPCONFIG_YNN | > + STEPCONFIG_INM | > + STEPCONFIG_YPN | STEPIDLE_INP; > + tscadc_writel(ts_config, REG_IDLECONFIG, idleconfig); } > + > +static irqreturn_t interrupt(int irq, void *dev) { > + struct tscadc *ts_dev = (struct tscadc *)dev; > + struct input_dev *input_dev = ts_dev->input; > + unsigned int status, irqclr = 0; > + int i, fsm, fifocount; > + unsigned int read, diff; > + unsigned int prev_val_x = ~0, prev_val_y = ~0; > + unsigned int prev_diff_x = ~0, prev_diff_y = ~0; > + unsigned int val_x = 0, val_y = 0, diffx = 0, diffy = 0; > + unsigned int z1 = 0, z2 = 0, z = 0; > + > + status = tscadc_readl(ts_dev, REG_IRQSTATUS); > + if (status & IRQENB_FIFO1THRES) { > + fifocount = tscadc_readl(ts_dev, REG_FIFO0CNT); > + > + /* Comparing 2 consecutive X/Y co-ordinates > + * to discard random unwanted samples from ADC. > + */ > + for (i = 0; i < (fifocount-1); i++) { > + read = ((tscadc_readl(ts_dev, REG_FIFO0)) & 0xfff); > + diff = abs(read - prev_val_x); > + if (diff < prev_diff_x) { > + prev_diff_x = diff; > + val_x = read; > + } > + prev_val_x = read; > + > + read = 0; > + read = ((tscadc_readl(ts_dev, REG_FIFO1)) & 0xfff); > + diff = abs(read - prev_val_y); > + if (diff < prev_diff_y) { > + prev_diff_y = diff; > + val_y = read; > + } > + prev_val_y = read; > + } > + > + diffx = abs(val_x - bckup_x); > + diffy = abs(val_y - bckup_y); > + bckup_x = val_x; > + bckup_y = val_y; > + > + z1 = ((tscadc_readl(ts_dev, REG_FIFO0)) & 0xfff); > + z2 = ((tscadc_readl(ts_dev, REG_FIFO1)) & 0xfff); > + > + if (pen == 0) { > + if ((z1 != 0) && (z2 != 0)) { > + /* cal pressure using formula > + * Resistance(touch) = x plate resistance * > + * x postion/4096 * ((z2 / z1) - 1) > + */ > + z = z2 - z1; > + z *= val_x; > + z *= ts_dev->x_plate_resistance; > + z /= z1; > + z = (z + 2047) >> 12; > + > + /* > + * Sample found inconsistent by debouncing > + * or pressure is beyond the maximum. > + * Don't report it to user space. > + */ > + if ((diffx < 15) && (diffy < 15) > + && (z <= MAX_12BIT)) { > + input_report_abs(input_dev, > + ABS_X, val_x); > + input_report_abs(input_dev, > + ABS_Y, val_y); > + input_report_abs(input_dev, > + ABS_PRESSURE, z); > + input_report_key(input_dev, > + BTN_TOUCH, 1); > + input_sync(input_dev); > + } > + } > + } > + irqclr |= IRQENB_FIFO1THRES; > + } > + > + /* > + * Time for sequencer to settle, > + * So that correct state of the > + * sequencer can be read. > + */ > + udelay(SEQ_SETTLE); > + > + status = tscadc_readl(ts_dev, REG_RAWIRQSTATUS); > + if (status & IRQENB_PENUP) { > + /* Pen up event */ > + fsm = tscadc_readl(ts_dev, REG_ADCFSM); > + if (fsm == ADCFSM_STEPID) { > + pen = 1; > + bckup_x = 0; > + bckup_y = 0; > + input_report_key(input_dev, BTN_TOUCH, 0); > + input_report_abs(input_dev, ABS_PRESSURE, 0); > + input_sync(input_dev); > + } else { > + pen = 0; > + } > + irqclr |= IRQENB_PENUP; > + } > + > + tscadc_writel(ts_dev, REG_IRQSTATUS, irqclr); > + /* check pending interrupts */ > + tscadc_writel(ts_dev, REG_IRQEOI, 0x0); > + > + tscadc_writel(ts_dev, REG_SE, 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, ctrl; > + struct tsc_data *pdata = pdev->dev.platform_data; > + struct resource *res; > + struct clk *clk; > + > + 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, 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->tsc_ick = clk_get(&pdev->dev, "adc_tsc_ick"); > + if (IS_ERR(ts_dev->tsc_ick)) { > + dev_err(&pdev->dev, "failed to get TSC ick\n"); > + goto err_free_irq; > + } > + clk_enable(ts_dev->tsc_ick); > + > + clk = clk_get(&pdev->dev, "adc_tsc_fck"); > + if (IS_ERR(clk)) { > + dev_err(&pdev->dev, "failed to get TSC fck\n"); > + err = PTR_ERR(clk); > + goto err_fail; > + } > + > + clk_value = clk_get_rate(clk) / ADC_CLK; > + if (clk_value < 7) { > + dev_err(&pdev->dev, "clock input less than min clock requirement\n"); > + goto err_fail; > + } > + /* CLKDIV needs to be configured to the value minus 1 */ > + clk_value = clk_value - 1; > + tscadc_writel(ts_dev, REG_CLKDIV, clk_value); > + > + /* Enable wake-up of the SoC using touchscreen */ > + tscadc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); > + > + ts_dev->wires = pdata->wires; > + ts_dev->x_plate_resistance = pdata->x_plate_resistance; > + > + ctrl = CNTRLREG_STEPCONFIGWRT | > + CNTRLREG_TSCENB | > + CNTRLREG_STEPID; > + switch (ts_dev->wires) { > + case 4: > + ctrl |= CNTRLREG_4WIRE; > + break; > + case 5: > + ctrl |= CNTRLREG_5WIRE; > + break; > + case 8: > + ctrl |= CNTRLREG_8WIRE; > + break; > + } > + tscadc_writel(ts_dev, REG_CTRL, ctrl); > + > + tsc_idle_config(ts_dev); > + tscadc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO1THRES); > + tsc_step_config(ts_dev); > + tscadc_writel(ts_dev, REG_FIFO1THR, 6); > + > + ctrl |= CNTRLREG_TSCSSENB; > + tscadc_writel(ts_dev, REG_CTRL, ctrl); > + > + input_dev->name = "ti-tsc-adc"; > + 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); > + input_set_abs_params(input_dev, ABS_PRESSURE, 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->tsc_ick); > + clk_put(ts_dev->tsc_ick); > +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->tsc_ick); > + clk_put(ts_dev->tsc_ick); > + > + 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..b315baa > --- /dev/null > +++ b/include/linux/input/ti_tscadc.h > @@ -0,0 +1,12 @@ > +/** > + * struct tsc_data Touchscreen wire configuration > + * @wires: Wires refer to application modes > + * i.e. 4/5/8 wire touchscreen support > + * on the platform. > + * @x_plate_resistance: X plate resistance. > + */ > + > +struct tsc_data { > + int wires; > + int x_plate_resistance; > +}; > -- > 1.7.1 > > Regards, Rachna. -- 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
