Make way for addition of MFD driver.
The existing touchsreen driver is a MFD client.
For better readability we rename the file to
indicate its functionality as only touchscreen.
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
To compile this driver as a module, choose M here: the
module will be called touchwin.
-config TOUCHSCREEN_TI_TSCADC
+config TOUCHSCREEN_TI_AM335X_TSC
tristate "TI Touchscreen Interface"
depends on ARCH_OMAP2PLUS
help
If unsure, say N.
To compile this driver as a module, choose M here: the
- module will be called ti_tscadc.
+ module will be called ti_am335x_tsc.
config TOUCHSCREEN_ATMEL_TSADCC
tristate "Atmel Touchscreen Interface"
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-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
--- /dev/null
+/*
+ * 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_am335x_tsc.h>
+#include <linux/delay.h>
+
+#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_FIFO0CNT 0xE4
+#define REG_FIFO0THR 0xE8
+#define REG_FIFO1THR 0xF4
+#define REG_FIFO0 0x100
+#define REG_FIFO1 0x200
+
+/* Register Bitfields */
+#define IRQWKUP_ENB BIT(0)
+
+/* Step Enable */
+#define STEPENB_MASK (0x1FFFF << 0)
+#define STEPENB(val) (val << 0)
+#define STPENB_STEPENB STEPENB(0x7FFF)
+
+/* IRQ enable */
+#define IRQENB_FIFO0THRES BIT(2)
+#define IRQENB_FIFO1THRES BIT(5)
+#define IRQENB_PENUP BIT(9)
+
+/* Step Configuration */
+#define STEPCONFIG_MODE_MASK (3 << 0)
+#define STEPCONFIG_MODE(val) (val << 0)
+#define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2)
+#define STEPCONFIG_AVG_MASK (7 << 2)
+#define STEPCONFIG_AVG(val) (val << 2)
+#define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4)
+#define STEPCONFIG_XPP BIT(5)
+#define STEPCONFIG_XNN BIT(6)
+#define STEPCONFIG_YPP BIT(7)
+#define STEPCONFIG_YNN BIT(8)
+#define STEPCONFIG_XNP BIT(9)
+#define STEPCONFIG_YPN BIT(10)
+#define STEPCONFIG_INM_MASK (0xF << 15)
+#define STEPCONFIG_INM(val) (val << 15)
+#define STEPCONFIG_INM_ADCREFM STEPCONFIG_INM(8)
+#define STEPCONFIG_INP_MASK (0xF << 19)
+#define STEPCONFIG_INP(val) (val << 19)
+#define STEPCONFIG_INP_AN2 STEPCONFIG_INP(2)
+#define STEPCONFIG_INP_AN3 STEPCONFIG_INP(3)
+#define STEPCONFIG_INP_AN4 STEPCONFIG_INP(4)
+#define STEPCONFIG_INP_ADCREFM STEPCONFIG_INP(8)
+#define STEPCONFIG_FIFO1 BIT(26)
+
+/* Delay register */
+#define STEPDELAY_OPEN_MASK (0x3FFFF << 0)
+#define STEPDELAY_OPEN(val) (val << 0)
+#define STEPCONFIG_OPENDLY STEPDELAY_OPEN(0x098)
+
+/* Charge Config */
+#define STEPCHARGE_RFP_MASK (7 << 12)
+#define STEPCHARGE_RFP(val) (val << 12)
+#define STEPCHARGE_RFP_XPUL STEPCHARGE_RFP(1)
+#define STEPCHARGE_INM_MASK (0xF << 15)
+#define STEPCHARGE_INM(val) (val << 15)
+#define STEPCHARGE_INM_AN1 STEPCHARGE_INM(1)
+#define STEPCHARGE_INP_MASK (0xF << 19)
+#define STEPCHARGE_INP(val) (val << 19)
+#define STEPCHARGE_INP_AN1 STEPCHARGE_INP(1)
+#define STEPCHARGE_RFM_MASK (3 << 23)
+#define STEPCHARGE_RFM(val) (val << 23)
+#define STEPCHARGE_RFM_XNUR STEPCHARGE_RFM(1)
+
+/* Charge delay */
+#define CHARGEDLY_OPEN_MASK (0x3FFFF << 0)
+#define CHARGEDLY_OPEN(val) (val << 0)
+#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(1)
+
+/* Control register */
+#define CNTRLREG_TSCSSENB BIT(0)
+#define CNTRLREG_STEPID BIT(1)
+#define CNTRLREG_STEPCONFIGWRT BIT(2)
+#define CNTRLREG_AFE_CTRL_MASK (3 << 5)
+#define CNTRLREG_AFE_CTRL(val) (val << 5)
+#define CNTRLREG_4WIRE CNTRLREG_AFE_CTRL(1)
+#define CNTRLREG_5WIRE CNTRLREG_AFE_CTRL(2)
+#define CNTRLREG_8WIRE CNTRLREG_AFE_CTRL(3)
+#define CNTRLREG_TSCENB BIT(7)
+
+#define ADCFSM_STEPID 0x10
+#define SEQ_SETTLE 275
+#define ADC_CLK 3000000
+#define MAX_12BIT ((1 << 12) - 1)
+
+struct titsc {
+ struct input_dev *input;
+ struct clk *tsc_ick;
+ void __iomem *tsc_base;
+ unsigned int irq;
+ unsigned int wires;
+ unsigned int x_plate_resistance;
+ bool pen_down;
+ int steps_to_configure;
+};
+
+static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
+{
+ return readl(ts->tsc_base + reg);
+}
+
+static void titsc_writel(struct titsc *tsc, unsigned int reg,
+ unsigned int val)
+{
+ writel(val, tsc->tsc_base + reg);
+}
+
+static void titsc_step_config(struct titsc *ts_dev)
+{
+ unsigned int config;
+ int i, total_steps;
+
+ /* Configure the Step registers */
+ total_steps = 2 * ts_dev->steps_to_configure;
+
+ config = STEPCONFIG_MODE_HWSYNC |
+ STEPCONFIG_AVG_16 | STEPCONFIG_XPP;
+ switch (ts_dev->wires) {
+ case 4:
+ config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
+ break;
+ case 5:
+ config |= STEPCONFIG_YNN |
+ STEPCONFIG_INP_AN4 | STEPCONFIG_XNN |
+ STEPCONFIG_YPP;
+ break;
+ case 8:
+ config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
+ break;
+ }
+
+ for (i = 1; i <= ts_dev->steps_to_configure; i++) {
+ titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
+ titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
+ }
+
+ config = 0;
+ config = STEPCONFIG_MODE_HWSYNC |
+ STEPCONFIG_AVG_16 | STEPCONFIG_YNN |
+ STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
+ switch (ts_dev->wires) {
+ case 4:
+ config |= STEPCONFIG_YPP;
+ break;
+ case 5:
+ config |= STEPCONFIG_XPP | STEPCONFIG_INP_AN4 |
+ STEPCONFIG_XNP | STEPCONFIG_YPN;
+ break;
+ case 8:
+ config |= STEPCONFIG_YPP;
+ break;
+ }
+
+ for (i = (ts_dev->steps_to_configure + 1); i <= total_steps; i++) {
+ titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
+ titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
+ }
+
+ config = 0;
+ /* Charge step configuration */
+ config = STEPCONFIG_XPP | STEPCONFIG_YNN |
+ STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR |
+ STEPCHARGE_INM_AN1 | STEPCHARGE_INP_AN1;
+
+ titsc_writel(ts_dev, REG_CHARGECONFIG, config);
+ titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
+
+ config = 0;
+ /* Configure to calculate pressure */
+ config = STEPCONFIG_MODE_HWSYNC |
+ STEPCONFIG_AVG_16 | STEPCONFIG_YPP |
+ STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM;
+ titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
+ titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
+ STEPCONFIG_OPENDLY);
+
+ config |= STEPCONFIG_INP_AN3 | STEPCONFIG_FIFO1;
+ titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config);
+ titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
+ STEPCONFIG_OPENDLY);
+
+ titsc_writel(ts_dev, REG_SE, STPENB_STEPENB);
+}
+
+static void titsc_idle_config(struct titsc *ts_config)
+{
+ unsigned int idleconfig;
+
+ idleconfig = STEPCONFIG_YNN |
+ STEPCONFIG_INM_ADCREFM |
+ STEPCONFIG_YPN | STEPCONFIG_INP_ADCREFM;
+ titsc_writel(ts_config, REG_IDLECONFIG, idleconfig);
+}
+
+static void titsc_read_coordinates(struct titsc *ts_dev,
+ unsigned int *x, unsigned int *y)
+{
+ unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT);
+ unsigned int prev_val_x = ~0, prev_val_y = ~0;
+ unsigned int prev_diff_x = ~0, prev_diff_y = ~0;
+ unsigned int read, diff;
+ unsigned int i;
+
+ /*
+ * Delta filter is used to remove large variations in sampled
+ * values from ADC. The filter tries to predict where the next
+ * coordinate could be. This is done by taking a previous
+ * coordinate and subtracting it form current one. Further the
+ * algorithm compares the difference with that of a present value,
+ * if true the value is reported to the sub system.
+ */
+ for (i = 0; i < fifocount - 1; i++) {
+ read = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
+ diff = abs(read - prev_val_x);
+ if (diff < prev_diff_x) {
+ prev_diff_x = diff;
+ *x = read;
+ }
+ prev_val_x = read;
+
+ read = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
+ diff = abs(read - prev_val_y);
+ if (diff < prev_diff_y) {
+ prev_diff_y = diff;
+ *y = read;
+ }
+ prev_val_y = read;
+ }
+}
+
+static irqreturn_t titsc_irq(int irq, void *dev)
+{
+ struct titsc *ts_dev = dev;
+ struct input_dev *input_dev = ts_dev->input;
+ unsigned int status, irqclr = 0;
+ unsigned int x = 0, y = 0;
+ unsigned int z1, z2, z;
+ unsigned int fsm;
+
+ status = titsc_readl(ts_dev, REG_IRQSTATUS);
+ if (status & IRQENB_FIFO0THRES) {
+ titsc_read_coordinates(ts_dev, &x, &y);
+
+ z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
+ z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
+
+ if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
+ /*
+ * Calculate pressure using formula
+ * Resistance(touch) = x plate resistance *
+ * x postion/4096 * ((z2 / z1) - 1)
+ */
+ z = z2 - z1;
+ z *= x;
+ z *= ts_dev->x_plate_resistance;
+ z /= z1;
+ z = (z + 2047) >> 12;
+
+ if (z <= MAX_12BIT) {
+ input_report_abs(input_dev, ABS_X, x);
+ input_report_abs(input_dev, ABS_Y, y);
+ input_report_abs(input_dev, ABS_PRESSURE, z);
+ input_report_key(input_dev, BTN_TOUCH, 1);
+ input_sync(input_dev);
+ }
+ }
+ irqclr |= IRQENB_FIFO0THRES;
+ }
+
+ /*
+ * Time for sequencer to settle, to read
+ * correct state of the sequencer.
+ */
+ udelay(SEQ_SETTLE);
+
+ status = titsc_readl(ts_dev, REG_RAWIRQSTATUS);
+ if (status & IRQENB_PENUP) {
+ /* Pen up event */
+ fsm = titsc_readl(ts_dev, REG_ADCFSM);
+ if (fsm == ADCFSM_STEPID) {
+ ts_dev->pen_down = false;
+ input_report_key(input_dev, BTN_TOUCH, 0);
+ input_report_abs(input_dev, ABS_PRESSURE, 0);
+ input_sync(input_dev);
+ } else {
+ ts_dev->pen_down = true;
+ }
+ irqclr |= IRQENB_PENUP;
+ }
+
+ titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
+
+ titsc_writel(ts_dev, REG_SE, STPENB_STEPENB);
+ return IRQ_HANDLED;
+}
+
+/*
+ * The functions for inserting/removing driver as a module.
+ */
+
+static int __devinit titsc_probe(struct platform_device *pdev)
+{
+ const struct tsc_data *pdata = pdev->dev.platform_data;
+ struct resource *res;
+ struct titsc *ts_dev;
+ struct input_dev *input_dev;
+ struct clk *clk;
+ int err;
+ int clk_value, ctrl, irq;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "missing platform data.\n");
+ return -EINVAL;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource defined.\n");
+ return -EINVAL;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no irq ID is specified.\n");
+ return -EINVAL;
+ }
+
+ /* Allocate memory for device */
+ ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ts_dev || !input_dev) {
+ dev_err(&pdev->dev, "failed to allocate memory.\n");
+ err = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ ts_dev->input = input_dev;
+ ts_dev->irq = irq;
+ ts_dev->wires = pdata->wires;
+ ts_dev->x_plate_resistance = pdata->x_plate_resistance;
+ ts_dev->steps_to_configure = pdata->steps_to_configure;
+
+ res = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to reserve registers.\n");
+ err = -EBUSY;
+ goto err_free_mem;
+ }
+
+ 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_region;
+ }
+
+ err = request_irq(ts_dev->irq, titsc_irq,
+ 0, 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_disable_clk;
+ }
+
+ clk_value = clk_get_rate(clk) / ADC_CLK;
+ clk_put(clk);
+
+ if (clk_value < 7) {
+ dev_err(&pdev->dev, "clock input less than min clock requirement\n");
+ goto err_disable_clk;
+ }
+ /* CLKDIV needs to be configured to the value minus 1 */
+ titsc_writel(ts_dev, REG_CLKDIV, clk_value - 1);
+
+ /* Enable wake-up of the SoC using touchscreen */
+ titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
+
+ 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;
+ }
+ titsc_writel(ts_dev, REG_CTRL, ctrl);
+
+ titsc_idle_config(ts_dev);
+ titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
+ titsc_step_config(ts_dev);
+ titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
+
+ ctrl |= CNTRLREG_TSCSSENB;
+ titsc_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_disable_clk;
+
+ platform_set_drvdata(pdev, ts_dev);
+ return 0;
+
+err_disable_clk:
+ 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_region:
+ release_mem_region(res->start, resource_size(res));
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(ts_dev);
+ return err;
+}
+
+static int __devexit titsc_remove(struct platform_device *pdev)
+{
+ struct titsc *ts_dev = platform_get_drvdata(pdev);
+ 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);
+
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver ti_tsc_driver = {
+ .probe = titsc_probe,
+ .remove = __devexit_p(titsc_remove),
+ .driver = {
+ .name = "tsc",
+ .owner = THIS_MODULE,
+ },
+};
+module_platform_driver(ti_tsc_driver);
+
+MODULE_DESCRIPTION("TI touchscreen controller driver");
+MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
+MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * 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_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_FIFO0CNT 0xE4
-#define REG_FIFO0THR 0xE8
-#define REG_FIFO1THR 0xF4
-#define REG_FIFO0 0x100
-#define REG_FIFO1 0x200
-
-/* Register Bitfields */
-#define IRQWKUP_ENB BIT(0)
-
-/* Step Enable */
-#define STEPENB_MASK (0x1FFFF << 0)
-#define STEPENB(val) (val << 0)
-#define STPENB_STEPENB STEPENB(0x7FFF)
-
-/* IRQ enable */
-#define IRQENB_FIFO0THRES BIT(2)
-#define IRQENB_FIFO1THRES BIT(5)
-#define IRQENB_PENUP BIT(9)
-
-/* Step Configuration */
-#define STEPCONFIG_MODE_MASK (3 << 0)
-#define STEPCONFIG_MODE(val) (val << 0)
-#define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2)
-#define STEPCONFIG_AVG_MASK (7 << 2)
-#define STEPCONFIG_AVG(val) (val << 2)
-#define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4)
-#define STEPCONFIG_XPP BIT(5)
-#define STEPCONFIG_XNN BIT(6)
-#define STEPCONFIG_YPP BIT(7)
-#define STEPCONFIG_YNN BIT(8)
-#define STEPCONFIG_XNP BIT(9)
-#define STEPCONFIG_YPN BIT(10)
-#define STEPCONFIG_INM_MASK (0xF << 15)
-#define STEPCONFIG_INM(val) (val << 15)
-#define STEPCONFIG_INM_ADCREFM STEPCONFIG_INM(8)
-#define STEPCONFIG_INP_MASK (0xF << 19)
-#define STEPCONFIG_INP(val) (val << 19)
-#define STEPCONFIG_INP_AN2 STEPCONFIG_INP(2)
-#define STEPCONFIG_INP_AN3 STEPCONFIG_INP(3)
-#define STEPCONFIG_INP_AN4 STEPCONFIG_INP(4)
-#define STEPCONFIG_INP_ADCREFM STEPCONFIG_INP(8)
-#define STEPCONFIG_FIFO1 BIT(26)
-
-/* Delay register */
-#define STEPDELAY_OPEN_MASK (0x3FFFF << 0)
-#define STEPDELAY_OPEN(val) (val << 0)
-#define STEPCONFIG_OPENDLY STEPDELAY_OPEN(0x098)
-
-/* Charge Config */
-#define STEPCHARGE_RFP_MASK (7 << 12)
-#define STEPCHARGE_RFP(val) (val << 12)
-#define STEPCHARGE_RFP_XPUL STEPCHARGE_RFP(1)
-#define STEPCHARGE_INM_MASK (0xF << 15)
-#define STEPCHARGE_INM(val) (val << 15)
-#define STEPCHARGE_INM_AN1 STEPCHARGE_INM(1)
-#define STEPCHARGE_INP_MASK (0xF << 19)
-#define STEPCHARGE_INP(val) (val << 19)
-#define STEPCHARGE_INP_AN1 STEPCHARGE_INP(1)
-#define STEPCHARGE_RFM_MASK (3 << 23)
-#define STEPCHARGE_RFM(val) (val << 23)
-#define STEPCHARGE_RFM_XNUR STEPCHARGE_RFM(1)
-
-/* Charge delay */
-#define CHARGEDLY_OPEN_MASK (0x3FFFF << 0)
-#define CHARGEDLY_OPEN(val) (val << 0)
-#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(1)
-
-/* Control register */
-#define CNTRLREG_TSCSSENB BIT(0)
-#define CNTRLREG_STEPID BIT(1)
-#define CNTRLREG_STEPCONFIGWRT BIT(2)
-#define CNTRLREG_AFE_CTRL_MASK (3 << 5)
-#define CNTRLREG_AFE_CTRL(val) (val << 5)
-#define CNTRLREG_4WIRE CNTRLREG_AFE_CTRL(1)
-#define CNTRLREG_5WIRE CNTRLREG_AFE_CTRL(2)
-#define CNTRLREG_8WIRE CNTRLREG_AFE_CTRL(3)
-#define CNTRLREG_TSCENB BIT(7)
-
-#define ADCFSM_STEPID 0x10
-#define SEQ_SETTLE 275
-#define ADC_CLK 3000000
-#define MAX_12BIT ((1 << 12) - 1)
-
-struct tscadc {
- struct input_dev *input;
- struct clk *tsc_ick;
- void __iomem *tsc_base;
- unsigned int irq;
- unsigned int wires;
- unsigned int x_plate_resistance;
- bool pen_down;
- int steps_to_configure;
-};
-
-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 tscadc_step_config(struct tscadc *ts_dev)
-{
- unsigned int config;
- int i, total_steps;
-
- /* Configure the Step registers */
- total_steps = 2 * ts_dev->steps_to_configure;
-
- config = STEPCONFIG_MODE_HWSYNC |
- STEPCONFIG_AVG_16 | STEPCONFIG_XPP;
- switch (ts_dev->wires) {
- case 4:
- config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
- break;
- case 5:
- config |= STEPCONFIG_YNN |
- STEPCONFIG_INP_AN4 | STEPCONFIG_XNN |
- STEPCONFIG_YPP;
- break;
- case 8:
- config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
- break;
- }
-
- for (i = 1; i <= ts_dev->steps_to_configure; 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_AVG_16 | STEPCONFIG_YNN |
- STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
- switch (ts_dev->wires) {
- case 4:
- config |= STEPCONFIG_YPP;
- break;
- case 5:
- config |= STEPCONFIG_XPP | STEPCONFIG_INP_AN4 |
- STEPCONFIG_XNP | STEPCONFIG_YPN;
- break;
- case 8:
- config |= STEPCONFIG_YPP;
- break;
- }
-
- for (i = (ts_dev->steps_to_configure + 1); i <= total_steps; 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_XPUL | STEPCHARGE_RFM_XNUR |
- STEPCHARGE_INM_AN1 | STEPCHARGE_INP_AN1;
-
- tscadc_writel(ts_dev, REG_CHARGECONFIG, config);
- tscadc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
-
- config = 0;
- /* Configure to calculate pressure */
- config = STEPCONFIG_MODE_HWSYNC |
- STEPCONFIG_AVG_16 | STEPCONFIG_YPP |
- STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM;
- tscadc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
- tscadc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
- STEPCONFIG_OPENDLY);
-
- config |= STEPCONFIG_INP_AN3 | STEPCONFIG_FIFO1;
- tscadc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config);
- tscadc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
- STEPCONFIG_OPENDLY);
-
- tscadc_writel(ts_dev, REG_SE, STPENB_STEPENB);
-}
-
-static void tscadc_idle_config(struct tscadc *ts_config)
-{
- unsigned int idleconfig;
-
- idleconfig = STEPCONFIG_YNN |
- STEPCONFIG_INM_ADCREFM |
- STEPCONFIG_YPN | STEPCONFIG_INP_ADCREFM;
- tscadc_writel(ts_config, REG_IDLECONFIG, idleconfig);
-}
-
-static void tscadc_read_coordinates(struct tscadc *ts_dev,
- unsigned int *x, unsigned int *y)
-{
- unsigned int fifocount = tscadc_readl(ts_dev, REG_FIFO0CNT);
- unsigned int prev_val_x = ~0, prev_val_y = ~0;
- unsigned int prev_diff_x = ~0, prev_diff_y = ~0;
- unsigned int read, diff;
- unsigned int i;
-
- /*
- * Delta filter is used to remove large variations in sampled
- * values from ADC. The filter tries to predict where the next
- * coordinate could be. This is done by taking a previous
- * coordinate and subtracting it form current one. Further the
- * algorithm compares the difference with that of a present value,
- * if true the value is reported to the sub system.
- */
- 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;
- *x = read;
- }
- prev_val_x = read;
-
- read = tscadc_readl(ts_dev, REG_FIFO1) & 0xfff;
- diff = abs(read - prev_val_y);
- if (diff < prev_diff_y) {
- prev_diff_y = diff;
- *y = read;
- }
- prev_val_y = read;
- }
-}
-
-static irqreturn_t tscadc_irq(int irq, void *dev)
-{
- struct tscadc *ts_dev = dev;
- struct input_dev *input_dev = ts_dev->input;
- unsigned int status, irqclr = 0;
- unsigned int x = 0, y = 0;
- unsigned int z1, z2, z;
- unsigned int fsm;
-
- status = tscadc_readl(ts_dev, REG_IRQSTATUS);
- if (status & IRQENB_FIFO0THRES) {
- tscadc_read_coordinates(ts_dev, &x, &y);
-
- z1 = tscadc_readl(ts_dev, REG_FIFO0) & 0xfff;
- z2 = tscadc_readl(ts_dev, REG_FIFO1) & 0xfff;
-
- if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
- /*
- * Calculate pressure using formula
- * Resistance(touch) = x plate resistance *
- * x postion/4096 * ((z2 / z1) - 1)
- */
- z = z2 - z1;
- z *= x;
- z *= ts_dev->x_plate_resistance;
- z /= z1;
- z = (z + 2047) >> 12;
-
- if (z <= MAX_12BIT) {
- input_report_abs(input_dev, ABS_X, x);
- input_report_abs(input_dev, ABS_Y, y);
- input_report_abs(input_dev, ABS_PRESSURE, z);
- input_report_key(input_dev, BTN_TOUCH, 1);
- input_sync(input_dev);
- }
- }
- irqclr |= IRQENB_FIFO0THRES;
- }
-
- /*
- * Time for sequencer to settle, to read
- * correct state of the sequencer.
- */
- 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) {
- ts_dev->pen_down = false;
- input_report_key(input_dev, BTN_TOUCH, 0);
- input_report_abs(input_dev, ABS_PRESSURE, 0);
- input_sync(input_dev);
- } else {
- ts_dev->pen_down = true;
- }
- irqclr |= IRQENB_PENUP;
- }
-
- tscadc_writel(ts_dev, REG_IRQSTATUS, irqclr);
-
- 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)
-{
- const struct tsc_data *pdata = pdev->dev.platform_data;
- struct resource *res;
- struct tscadc *ts_dev;
- struct input_dev *input_dev;
- struct clk *clk;
- int err;
- int clk_value, ctrl, irq;
-
- if (!pdata) {
- dev_err(&pdev->dev, "missing platform data.\n");
- return -EINVAL;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "no memory resource defined.\n");
- return -EINVAL;
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "no irq ID is specified.\n");
- return -EINVAL;
- }
-
- /* Allocate memory for device */
- ts_dev = kzalloc(sizeof(struct tscadc), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!ts_dev || !input_dev) {
- dev_err(&pdev->dev, "failed to allocate memory.\n");
- err = -ENOMEM;
- goto err_free_mem;
- }
-
- ts_dev->input = input_dev;
- ts_dev->irq = irq;
- ts_dev->wires = pdata->wires;
- ts_dev->x_plate_resistance = pdata->x_plate_resistance;
- ts_dev->steps_to_configure = pdata->steps_to_configure;
-
- res = request_mem_region(res->start, resource_size(res), pdev->name);
- if (!res) {
- dev_err(&pdev->dev, "failed to reserve registers.\n");
- err = -EBUSY;
- goto err_free_mem;
- }
-
- 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_region;
- }
-
- err = request_irq(ts_dev->irq, tscadc_irq,
- 0, 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_disable_clk;
- }
-
- clk_value = clk_get_rate(clk) / ADC_CLK;
- clk_put(clk);
-
- if (clk_value < 7) {
- dev_err(&pdev->dev, "clock input less than min clock requirement\n");
- goto err_disable_clk;
- }
- /* CLKDIV needs to be configured to the value minus 1 */
- tscadc_writel(ts_dev, REG_CLKDIV, clk_value - 1);
-
- /* Enable wake-up of the SoC using touchscreen */
- tscadc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
-
- 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);
-
- tscadc_idle_config(ts_dev);
- tscadc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
- tscadc_step_config(ts_dev);
- tscadc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
-
- 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_disable_clk;
-
- platform_set_drvdata(pdev, ts_dev);
- return 0;
-
-err_disable_clk:
- 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_region:
- release_mem_region(res->start, resource_size(res));
-err_free_mem:
- input_free_device(input_dev);
- kfree(ts_dev);
- return err;
-}
-
-static int __devexit tscadc_remove(struct platform_device *pdev)
-{
- struct tscadc *ts_dev = platform_get_drvdata(pdev);
- 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);
-
- platform_set_drvdata(pdev, NULL);
- return 0;
-}
-
-static struct platform_driver ti_tsc_driver = {
- .probe = tscadc_probe,
- .remove = __devexit_p(tscadc_remove),
- .driver = {
- .name = "tsc",
- .owner = THIS_MODULE,
- },
-};
-module_platform_driver(ti_tsc_driver);
-
-MODULE_DESCRIPTION("TI touchscreen controller driver");
-MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
-MODULE_LICENSE("GPL");
--- /dev/null
+#ifndef __LINUX_TI_AM335X_TSC_H
+#define __LINUX_TI_AM335X_TSC_H
+
+/**
+ * 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.
+ * @steps_to_configure: The sequencer supports a total of
+ * 16 programmable steps.
+ * A step configured to read a single
+ * co-ordinate value, can be applied
+ * more number of times for better results.
+ */
+
+struct tsc_data {
+ int wires;
+ int x_plate_resistance;
+ int steps_to_configure;
+};
+
+#endif
+++ /dev/null
-#ifndef __LINUX_TI_TSCADC_H
-#define __LINUX_TI_TSCADC_H
-
-/**
- * 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.
- * @steps_to_configure: The sequencer supports a total of
- * 16 programmable steps.
- * A step configured to read a single
- * co-ordinate value, can be applied
- * more number of times for better results.
- */
-
-struct tsc_data {
- int wires;
- int x_plate_resistance;
- int steps_to_configure;
-};
-
-#endif
projects / deliverable / linux.git / commitdiff
