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Diffstat (limited to 'arch/mips/au1000/db1x00/mirage_ts.c')
-rw-r--r--arch/mips/au1000/db1x00/mirage_ts.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/arch/mips/au1000/db1x00/mirage_ts.c b/arch/mips/au1000/db1x00/mirage_ts.c
new file mode 100644
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+++ b/arch/mips/au1000/db1x00/mirage_ts.c
@@ -0,0 +1,261 @@
+/*
+ * linux/arch/mips/au1000/db1x00/mirage_ts.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ * Glue between Mirage board-specific touchscreen pieces
+ * and generic Wolfson Codec touchscreen support.
+ *
+ * Based on pb1100_ts.c used in Hydrogen II.
+ *
+ * Copyright (c) 2003 Embedded Edge, LLC
+ * dan@embeddededge.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; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/wait.h>
+
+#include <asm/segment.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/delay.h>
+#include <asm/au1000.h>
+
+/*
+ * Imported interface to Wolfson Codec driver.
+ */
+extern void *wm97xx_ts_get_handle(int which);
+extern int wm97xx_ts_ready(void* ts_handle);
+extern void wm97xx_ts_set_cal(void* ts_handle, int xscale, int xtrans, int yscale, int ytrans);
+extern u16 wm97xx_ts_get_ac97(void* ts_handle, u8 reg);
+extern void wm97xx_ts_set_ac97(void* ts_handle, u8 reg, u16 val);
+extern int wm97xx_ts_read_data(void* ts_handle, long* x, long* y, long* pressure);
+extern void wm97xx_ts_send_data(void* ts_handle, long x, long y, long z);
+
+int wm97xx_comodule_present = 1;
+
+
+#define TS_NAME "mirage_ts"
+
+#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
+#define DPRINTK(format, arg...) printk("%s: " format "\n", __FUNCTION__ , ## arg)
+
+
+#define PEN_DOWN_IRQ AU1000_GPIO_7
+
+static struct task_struct *ts_task = 0;
+static DECLARE_COMPLETION(ts_complete);
+static DECLARE_WAIT_QUEUE_HEAD(pendown_wait);
+
+#ifdef CONFIG_WM97XX_FIVEWIRETS
+static int release_pressure = 1;
+#else
+static int release_pressure = 50;
+#endif
+
+typedef struct {
+ long x;
+ long y;
+} DOWN_EVENT;
+
+#define SAMPLE_RATE 50 /* samples per second */
+#define PEN_DEBOUNCE 5 /* samples for settling - fn of SAMPLE_RATE */
+#define PEN_UP_TIMEOUT 10 /* in seconds */
+#define PEN_UP_SETTLE 5 /* samples per second */
+
+static struct {
+ int xscale;
+ int xtrans;
+ int yscale;
+ int ytrans;
+} mirage_ts_cal =
+{
+#if 0
+ xscale: 84,
+ xtrans: -157,
+ yscale: 66,
+ ytrans: -150,
+#else
+ xscale: 84,
+ xtrans: -150,
+ yscale: 66,
+ ytrans: -146,
+#endif
+};
+
+
+static void pendown_irq(int irqnr, void *devid, struct pt_regs *regs)
+{
+//DPRINTK("got one 0x%x", au_readl(SYS_PINSTATERD));
+ wake_up(&pendown_wait);
+}
+
+static int ts_thread(void *id)
+{
+ static int pen_was_down = 0;
+ static DOWN_EVENT pen_xy;
+ long x, y, z;
+ void *ts; /* handle */
+ struct task_struct *tsk = current;
+ int timeout = HZ / SAMPLE_RATE;
+
+ ts_task = tsk;
+
+ daemonize();
+ tsk->tty = NULL;
+ tsk->policy = SCHED_FIFO;
+ tsk->rt_priority = 1;
+ strcpy(tsk->comm, "touchscreen");
+
+ /* only want to receive SIGKILL */
+ spin_lock_irq(&tsk->sigmask_lock);
+ siginitsetinv(&tsk->blocked, sigmask(SIGKILL));
+ recalc_sigpending(tsk);
+ spin_unlock_irq(&tsk->sigmask_lock);
+
+ /* get handle for codec */
+ ts = wm97xx_ts_get_handle(0);
+
+ /* proceed only after everybody is ready */
+ wait_event_timeout(pendown_wait, wm97xx_ts_ready(ts), HZ/4);
+
+ /* board-specific calibration */
+ wm97xx_ts_set_cal(ts,
+ mirage_ts_cal.xscale,
+ mirage_ts_cal.xtrans,
+ mirage_ts_cal.yscale,
+ mirage_ts_cal.ytrans);
+
+ /* route Wolfson pendown interrupts to our GPIO */
+ au_sync();
+ wm97xx_ts_set_ac97(ts, 0x4c, wm97xx_ts_get_ac97(ts, 0x4c) & ~0x0008);
+ au_sync();
+ wm97xx_ts_set_ac97(ts, 0x56, wm97xx_ts_get_ac97(ts, 0x56) & ~0x0008);
+ au_sync();
+ wm97xx_ts_set_ac97(ts, 0x52, wm97xx_ts_get_ac97(ts, 0x52) | 0x2008);
+ au_sync();
+
+ for (;;) {
+ interruptible_sleep_on_timeout(&pendown_wait, timeout);
+ disable_irq(PEN_DOWN_IRQ);
+ if (signal_pending(tsk)) {
+ break;
+ }
+
+ /* read codec */
+ if (!wm97xx_ts_read_data(ts, &x, &y, &z))
+ z = 0; /* treat no-data and pen-up the same */
+
+ if (signal_pending(tsk)) {
+ break;
+ }
+
+ if (z >= release_pressure) {
+ y = ~y; /* top to bottom */
+ if (pen_was_down > 1 /*&& pen_was_down < PEN_DEBOUNCE*/) {//THXXX
+ /* bounce ? */
+ x = pen_xy.x;
+ y = pen_xy.y;
+ --pen_was_down;
+ } else if (pen_was_down <= 1) {
+ pen_xy.x = x;
+ pen_xy.y = y;
+ if (pen_was_down)
+ wm97xx_ts_send_data(ts, x, y, z);
+ pen_was_down = PEN_DEBOUNCE;
+ }
+ //wm97xx_ts_send_data(ts, x, y, z);
+ timeout = HZ / SAMPLE_RATE;
+ } else {
+ if (pen_was_down) {
+ if (--pen_was_down)
+ z = release_pressure;
+ else //THXXX
+ wm97xx_ts_send_data(ts, pen_xy.x, pen_xy.y, z);
+ }
+ /* The pendown signal takes some time to settle after
+ * reading the pen pressure so wait a little
+ * before enabling the pen.
+ */
+ if (! pen_was_down) {
+// interruptible_sleep_on_timeout(&pendown_wait, HZ / PEN_UP_SETTLE);
+ timeout = HZ * PEN_UP_TIMEOUT;
+ }
+ }
+ enable_irq(PEN_DOWN_IRQ);
+ }
+ enable_irq(PEN_DOWN_IRQ);
+ ts_task = NULL;
+ complete(&ts_complete);
+ return 0;
+}
+
+static int __init ts_mirage_init(void)
+{
+ int ret;
+
+ /* pen down signal is connected to GPIO 7 */
+
+ ret = request_irq(PEN_DOWN_IRQ, pendown_irq, 0, "ts-pendown", NULL);
+ if (ret) {
+ err("unable to get pendown irq%d: [%d]", PEN_DOWN_IRQ, ret);
+ return ret;
+ }
+
+ lock_kernel();
+ ret = kernel_thread(ts_thread, NULL, CLONE_FS | CLONE_FILES);
+ if (ret < 0) {
+ unlock_kernel();
+ return ret;
+ }
+ unlock_kernel();
+
+ info("Mirage touchscreen IRQ initialized.");
+
+ return 0;
+}
+
+static void __exit ts_mirage_exit(void)
+{
+ if (ts_task) {
+ send_sig(SIGKILL, ts_task, 1);
+ wait_for_completion(&ts_complete);
+ }
+
+ free_irq(PEN_DOWN_IRQ, NULL);
+}
+
+module_init(ts_mirage_init);
+module_exit(ts_mirage_exit);
+