--- /dev/null
+/*
+ * Texas Instruments TNETV107X Touchscreen Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/ctype.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <mach/tnetv107x.h>
+
+#define TSC_PENUP_POLL (HZ / 5)
+#define IDLE_TIMEOUT 100 /* msec */
+
+/*
+ * The first and last samples of a touch interval are usually garbage and need
+ * to be filtered out with these devices. The following definitions control
+ * the number of samples skipped.
+ */
+#define TSC_HEAD_SKIP 1
+#define TSC_TAIL_SKIP 1
+#define TSC_SKIP (TSC_HEAD_SKIP + TSC_TAIL_SKIP + 1)
+#define TSC_SAMPLES (TSC_SKIP + 1)
+
+/* Register Offsets */
+struct tsc_regs {
+ u32 rev;
+ u32 tscm;
+ u32 bwcm;
+ u32 swc;
+ u32 adcchnl;
+ u32 adcdata;
+ u32 chval[4];
+};
+
+/* TSC Mode Configuration Register (tscm) bits */
+#define WMODE BIT(0)
+#define TSKIND BIT(1)
+#define ZMEASURE_EN BIT(2)
+#define IDLE BIT(3)
+#define TSC_EN BIT(4)
+#define STOP BIT(5)
+#define ONE_SHOT BIT(6)
+#define SINGLE BIT(7)
+#define AVG BIT(8)
+#define AVGNUM(x) (((x) & 0x03) << 9)
+#define PVSTC(x) (((x) & 0x07) << 11)
+#define PON BIT(14)
+#define PONBG BIT(15)
+#define AFERST BIT(16)
+
+/* ADC DATA Capture Register bits */
+#define DATA_VALID BIT(16)
+
+/* Register Access Macros */
+#define tsc_read(ts, reg) __raw_readl(&(ts)->regs->reg)
+#define tsc_write(ts, reg, val) __raw_writel(val, &(ts)->regs->reg);
+#define tsc_set_bits(ts, reg, val) \
+ tsc_write(ts, reg, tsc_read(ts, reg) | (val))
+#define tsc_clr_bits(ts, reg, val) \
+ tsc_write(ts, reg, tsc_read(ts, reg) & ~(val))
+
+struct sample {
+ int x, y, p;
+};
+
+struct tsc_data {
+ struct input_dev *input_dev;
+ struct resource *res;
+ struct tsc_regs __iomem *regs;
+ struct timer_list timer;
+ spinlock_t lock;
+ struct clk *clk;
+ struct device *dev;
+ int sample_count;
+ struct sample samples[TSC_SAMPLES];
+ int tsc_irq;
+};
+
+static int tsc_read_sample(struct tsc_data *ts, struct sample* sample)
+{
+ int x, y, z1, z2, t, p = 0;
+ u32 val;
+
+ val = tsc_read(ts, chval[0]);
+ if (val & DATA_VALID)
+ x = val & 0xffff;
+ else
+ return -EINVAL;
+
+ y = tsc_read(ts, chval[1]) & 0xffff;
+ z1 = tsc_read(ts, chval[2]) & 0xffff;
+ z2 = tsc_read(ts, chval[3]) & 0xffff;
+
+ if (z1) {
+ t = ((600 * x) * (z2 - z1));
+ p = t / (u32) (z1 << 12);
+ if (p < 0)
+ p = 0;
+ }
+
+ sample->x = x;
+ sample->y = y;
+ sample->p = p;
+
+ return 0;
+}
+
+static void tsc_poll(unsigned long data)
+{
+ struct tsc_data *ts = (struct tsc_data *)data;
+ unsigned long flags;
+ int i, val, x, y, p;
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ if (ts->sample_count >= TSC_SKIP) {
+ input_report_abs(ts->input_dev, ABS_PRESSURE, 0);
+ input_report_key(ts->input_dev, BTN_TOUCH, 0);
+ input_sync(ts->input_dev);
+ } else if (ts->sample_count > 0) {
+ /*
+ * A touch event lasted less than our skip count. Salvage and
+ * report anyway.
+ */
+ for (i = 0, val = 0; i < ts->sample_count; i++)
+ val += ts->samples[i].x;
+ x = val / ts->sample_count;
+
+ for (i = 0, val = 0; i < ts->sample_count; i++)
+ val += ts->samples[i].y;
+ y = val / ts->sample_count;
+
+ for (i = 0, val = 0; i < ts->sample_count; i++)
+ val += ts->samples[i].p;
+ p = val / ts->sample_count;
+
+ input_report_abs(ts->input_dev, ABS_X, x);
+ input_report_abs(ts->input_dev, ABS_Y, y);
+ input_report_abs(ts->input_dev, ABS_PRESSURE, p);
+ input_report_key(ts->input_dev, BTN_TOUCH, 1);
+ input_sync(ts->input_dev);
+ }
+
+ ts->sample_count = 0;
+
+ spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+static irqreturn_t tsc_irq(int irq, void *dev_id)
+{
+ struct tsc_data *ts = (struct tsc_data *)dev_id;
+ struct sample *sample;
+ int index;
+
+ spin_lock(&ts->lock);
+
+ index = ts->sample_count % TSC_SAMPLES;
+ sample = &ts->samples[index];
+ if (tsc_read_sample(ts, sample) < 0)
+ goto out;
+
+ if (++ts->sample_count >= TSC_SKIP) {
+ index = (ts->sample_count - TSC_TAIL_SKIP - 1) % TSC_SAMPLES;
+ sample = &ts->samples[index];
+
+ input_report_abs(ts->input_dev, ABS_X, sample->x);
+ input_report_abs(ts->input_dev, ABS_Y, sample->y);
+ input_report_abs(ts->input_dev, ABS_PRESSURE, sample->p);
+ if (ts->sample_count == TSC_SKIP)
+ input_report_key(ts->input_dev, BTN_TOUCH, 1);
+ input_sync(ts->input_dev);
+ }
+ mod_timer(&ts->timer, jiffies + TSC_PENUP_POLL);
+out:
+ spin_unlock(&ts->lock);
+ return IRQ_HANDLED;
+}
+
+static int tsc_start(struct input_dev *dev)
+{
+ struct tsc_data *ts = input_get_drvdata(dev);
+ unsigned long timeout = jiffies + msecs_to_jiffies(IDLE_TIMEOUT);
+ u32 val;
+
+ clk_enable(ts->clk);
+
+ /* Go to idle mode, before any initialization */
+ while (time_after(timeout, jiffies)) {
+ if (tsc_read(ts, tscm) & IDLE)
+ break;
+ }
+
+ if (time_before(timeout, jiffies)) {
+ dev_warn(ts->dev, "timeout waiting for idle\n");
+ clk_disable(ts->clk);
+ return -EIO;
+ }
+
+ /* Configure TSC Control register*/
+ val = (PONBG | PON | PVSTC(4) | ONE_SHOT | ZMEASURE_EN);
+ tsc_write(ts, tscm, val);
+
+ /* Bring TSC out of reset: Clear AFE reset bit */
+ val &= ~(AFERST);
+ tsc_write(ts, tscm, val);
+
+ /* Configure all pins for hardware control*/
+ tsc_write(ts, bwcm, 0);
+
+ /* Finally enable the TSC */
+ tsc_set_bits(ts, tscm, TSC_EN);
+
+ return 0;
+}
+
+static void tsc_stop(struct input_dev *dev)
+{
+ struct tsc_data *ts = input_get_drvdata(dev);
+
+ tsc_clr_bits(ts, tscm, TSC_EN);
+ synchronize_irq(ts->tsc_irq);
+ del_timer_sync(&ts->timer);
+ clk_disable(ts->clk);
+}
+
+static int __devinit tsc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct tsc_data *ts;
+ int error = 0;
+ u32 rev = 0;
+
+ ts = kzalloc(sizeof(struct tsc_data), GFP_KERNEL);
+ if (!ts) {
+ dev_err(dev, "cannot allocate device info\n");
+ return -ENOMEM;
+ }
+
+ ts->dev = dev;
+ spin_lock_init(&ts->lock);
+ setup_timer(&ts->timer, tsc_poll, (unsigned long)ts);
+ platform_set_drvdata(pdev, ts);
+
+ ts->tsc_irq = platform_get_irq(pdev, 0);
+ if (ts->tsc_irq < 0) {
+ dev_err(dev, "cannot determine device interrupt\n");
+ error = -ENODEV;
+ goto error_res;
+ }
+
+ ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!ts->res) {
+ dev_err(dev, "cannot determine register area\n");
+ error = -ENODEV;
+ goto error_res;
+ }
+
+ if (!request_mem_region(ts->res->start, resource_size(ts->res),
+ pdev->name)) {
+ dev_err(dev, "cannot claim register memory\n");
+ ts->res = NULL;
+ error = -EINVAL;
+ goto error_res;
+ }
+
+ ts->regs = ioremap(ts->res->start, resource_size(ts->res));
+ if (!ts->regs) {
+ dev_err(dev, "cannot map register memory\n");
+ error = -ENOMEM;
+ goto error_map;
+ }
+
+ ts->clk = clk_get(dev, NULL);
+ if (!ts->clk) {
+ dev_err(dev, "cannot claim device clock\n");
+ error = -EINVAL;
+ goto error_clk;
+ }
+
+ error = request_threaded_irq(ts->tsc_irq, NULL, tsc_irq, 0,
+ dev_name(dev), ts);
+ if (error < 0) {
+ dev_err(ts->dev, "Could not allocate ts irq\n");
+ goto error_irq;
+ }
+
+ ts->input_dev = input_allocate_device();
+ if (!ts->input_dev) {
+ dev_err(dev, "cannot allocate input device\n");
+ error = -ENOMEM;
+ goto error_input;
+ }
+ input_set_drvdata(ts->input_dev, ts);
+
+ ts->input_dev->name = pdev->name;
+ ts->input_dev->id.bustype = BUS_HOST;
+ ts->input_dev->dev.parent = &pdev->dev;
+ ts->input_dev->open = tsc_start;
+ ts->input_dev->close = tsc_stop;
+
+ clk_enable(ts->clk);
+ rev = tsc_read(ts, rev);
+ ts->input_dev->id.product = ((rev >> 8) & 0x07);
+ ts->input_dev->id.version = ((rev >> 16) & 0xfff);
+ clk_disable(ts->clk);
+
+ __set_bit(EV_KEY, ts->input_dev->evbit);
+ __set_bit(EV_ABS, ts->input_dev->evbit);
+ __set_bit(BTN_TOUCH, ts->input_dev->keybit);
+
+ input_set_abs_params(ts->input_dev, ABS_X, 0, 0xffff, 5, 0);
+ input_set_abs_params(ts->input_dev, ABS_Y, 0, 0xffff, 5, 0);
+ input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 4095, 128, 0);
+
+ error = input_register_device(ts->input_dev);
+ if (error < 0) {
+ dev_err(dev, "failed input device registration\n");
+ goto error_reg;
+ }
+
+ return 0;
+
+error_reg:
+ input_free_device(ts->input_dev);
+error_input:
+ free_irq(ts->tsc_irq, ts);
+error_irq:
+ clk_put(ts->clk);
+error_clk:
+ iounmap(ts->regs);
+error_map:
+ release_mem_region(ts->res->start, resource_size(ts->res));
+error_res:
+ platform_set_drvdata(pdev, NULL);
+ kfree(ts);
+
+ return error;
+}
+
+static int __devexit tsc_remove(struct platform_device *pdev)
+{
+ struct tsc_data *ts = platform_get_drvdata(pdev);
+
+ input_unregister_device(ts->input_dev);
+ free_irq(ts->tsc_irq, ts);
+ clk_put(ts->clk);
+ iounmap(ts->regs);
+ release_mem_region(ts->res->start, resource_size(ts->res));
+ platform_set_drvdata(pdev, NULL);
+ kfree(ts);
+
+ return 0;
+}
+
+static struct platform_driver tsc_driver = {
+ .probe = tsc_probe,
+ .remove = __devexit_p(tsc_remove),
+ .driver.name = "tnetv107x-ts",
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init tsc_init(void)
+{
+ return platform_driver_register(&tsc_driver);
+}
+
+static void __exit tsc_exit(void)
+{
+ platform_driver_unregister(&tsc_driver);
+}
+
+module_init(tsc_init);
+module_exit(tsc_exit);
+
+MODULE_AUTHOR("Cyril Chemparathy");
+MODULE_DESCRIPTION("TNETV107X Touchscreen Driver");
+MODULE_ALIAS("platform: tnetv107x-ts");
+MODULE_LICENSE("GPL");
projects / linux-beck.git / commitdiff