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Input: WM97xx - add support for streaming mode on Mainstone
Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com> Signed-off-by: Mike Arthur <mike.arthur@wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Mark Brown
Dmitry Torokhov
parent
dca98e91fb
commit
4db8a5f21e
@ -226,6 +226,18 @@ config TOUCHSCREEN_WM9713
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If unsure, say N.
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config TOUCHSCREEN_WM97XX_MAINSTONE
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tristate "WM97xx Mainstone accelerated touch"
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depends on TOUCHSCREEN_WM97XX && ARCH_PXA
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help
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Say Y here for support for streaming mode with WM97xx touchscreens
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on Mainstone systems.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called mainstone-wm97xx.
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config TOUCHSCREEN_USB_COMPOSITE
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tristate "USB Touchscreen Driver"
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depends on USB_ARCH_HAS_HCD
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@ -25,3 +25,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
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wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
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wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
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wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
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302
drivers/input/touchscreen/mainstone-wm97xx.c
Normal file
302
drivers/input/touchscreen/mainstone-wm97xx.c
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@ -0,0 +1,302 @@
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/*
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* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
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* Wolfson WM97xx AC97 Codecs.
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*
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* Copyright 2004, 2007 Wolfson Microelectronics PLC.
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* Author: Liam Girdwood
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* liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
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* Parts Copyright : Ian Molton <spyro@f2s.com>
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* Andrew Zabolotny <zap@homelink.ru>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Notes:
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* This is a wm97xx extended touch driver to capture touch
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* data in a continuous manner on the Intel XScale archictecture
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*
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* Features:
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* - codecs supported:- WM9705, WM9712, WM9713
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* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/wm97xx.h>
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#include <linux/io.h>
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#include <asm/arch/pxa-regs.h>
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#define VERSION "0.13"
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struct continuous {
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u16 id; /* codec id */
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u8 code; /* continuous code */
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u8 reads; /* number of coord reads per read cycle */
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u32 speed; /* number of coords per second */
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};
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#define WM_READS(sp) ((sp / HZ) + 1)
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static const struct continuous cinfo[] = {
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{WM9705_ID2, 0, WM_READS(94), 94},
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{WM9705_ID2, 1, WM_READS(188), 188},
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{WM9705_ID2, 2, WM_READS(375), 375},
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{WM9705_ID2, 3, WM_READS(750), 750},
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{WM9712_ID2, 0, WM_READS(94), 94},
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{WM9712_ID2, 1, WM_READS(188), 188},
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{WM9712_ID2, 2, WM_READS(375), 375},
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{WM9712_ID2, 3, WM_READS(750), 750},
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{WM9713_ID2, 0, WM_READS(94), 94},
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{WM9713_ID2, 1, WM_READS(120), 120},
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{WM9713_ID2, 2, WM_READS(154), 154},
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{WM9713_ID2, 3, WM_READS(188), 188},
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};
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/* continuous speed index */
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static int sp_idx;
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static u16 last, tries;
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/*
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* Pen sampling frequency (Hz) in continuous mode.
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*/
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static int cont_rate = 200;
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module_param(cont_rate, int, 0);
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MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
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/*
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* Pen down detection.
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*
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* This driver can either poll or use an interrupt to indicate a pen down
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* event. If the irq request fails then it will fall back to polling mode.
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*/
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static int pen_int;
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module_param(pen_int, int, 0);
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MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
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/*
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* Pressure readback.
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*
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* Set to 1 to read back pen down pressure
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*/
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static int pressure;
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module_param(pressure, int, 0);
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MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
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/*
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* AC97 touch data slot.
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*
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* Touch screen readback data ac97 slot
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*/
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static int ac97_touch_slot = 5;
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module_param(ac97_touch_slot, int, 0);
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MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
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/* flush AC97 slot 5 FIFO on pxa machines */
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#ifdef CONFIG_PXA27x
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static void wm97xx_acc_pen_up(struct wm97xx *wm)
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{
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schedule_timeout_uninterruptible(1);
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while (MISR & (1 << 2))
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MODR;
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}
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#else
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static void wm97xx_acc_pen_up(struct wm97xx *wm)
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{
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int count = 16;
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schedule_timeout_uninterruptible(1);
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while (count < 16) {
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MODR;
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count--;
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}
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}
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#endif
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static int wm97xx_acc_pen_down(struct wm97xx *wm)
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{
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u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
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int reads = 0;
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/* When the AC97 queue has been drained we need to allow time
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* to buffer up samples otherwise we end up spinning polling
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* for samples. The controller can't have a suitably low
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* threashold set to use the notifications it gives.
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*/
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schedule_timeout_uninterruptible(1);
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if (tries > 5) {
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tries = 0;
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return RC_PENUP;
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}
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x = MODR;
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if (x == last) {
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tries++;
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return RC_AGAIN;
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}
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last = x;
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do {
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if (reads)
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x = MODR;
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y = MODR;
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if (pressure)
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p = MODR;
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/* are samples valid */
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if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X ||
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(y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y ||
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(p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)
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goto up;
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/* coordinate is good */
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tries = 0;
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input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
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input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
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input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
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input_sync(wm->input_dev);
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reads++;
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} while (reads < cinfo[sp_idx].reads);
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up:
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return RC_PENDOWN | RC_AGAIN;
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}
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static int wm97xx_acc_startup(struct wm97xx *wm)
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{
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int idx = 0;
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/* check we have a codec */
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if (wm->ac97 == NULL)
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return -ENODEV;
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/* Go you big red fire engine */
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for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
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if (wm->id != cinfo[idx].id)
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continue;
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sp_idx = idx;
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if (cont_rate <= cinfo[idx].speed)
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break;
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}
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wm->acc_rate = cinfo[sp_idx].code;
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wm->acc_slot = ac97_touch_slot;
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dev_info(wm->dev,
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"mainstone accelerated touchscreen driver, %d samples/sec\n",
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cinfo[sp_idx].speed);
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/* codec specific irq config */
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if (pen_int) {
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switch (wm->id) {
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case WM9705_ID2:
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wm->pen_irq = IRQ_GPIO(4);
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set_irq_type(IRQ_GPIO(4), IRQT_BOTHEDGE);
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break;
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case WM9712_ID2:
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case WM9713_ID2:
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/* enable pen down interrupt */
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/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
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wm->pen_irq = MAINSTONE_AC97_IRQ;
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wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
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WM97XX_GPIO_POL_HIGH,
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WM97XX_GPIO_STICKY,
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WM97XX_GPIO_WAKE);
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wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
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WM97XX_GPIO_POL_HIGH,
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WM97XX_GPIO_NOTSTICKY,
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WM97XX_GPIO_NOWAKE);
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break;
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default:
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dev_err(wm->dev,
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"pen down irq not supported on this device\n");
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pen_int = 0;
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break;
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}
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}
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return 0;
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}
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static void wm97xx_acc_shutdown(struct wm97xx *wm)
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{
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/* codec specific deconfig */
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if (pen_int) {
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switch (wm->id & 0xffff) {
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case WM9705_ID2:
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wm->pen_irq = 0;
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break;
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case WM9712_ID2:
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case WM9713_ID2:
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/* disable interrupt */
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wm->pen_irq = 0;
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break;
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}
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}
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}
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static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
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{
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if (enable)
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enable_irq(wm->pen_irq);
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else
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disable_irq(wm->pen_irq);
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}
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static struct wm97xx_mach_ops mainstone_mach_ops = {
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.acc_enabled = 1,
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.acc_pen_up = wm97xx_acc_pen_up,
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.acc_pen_down = wm97xx_acc_pen_down,
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.acc_startup = wm97xx_acc_startup,
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.acc_shutdown = wm97xx_acc_shutdown,
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.irq_enable = wm97xx_irq_enable,
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.irq_gpio = WM97XX_GPIO_2,
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};
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static int mainstone_wm97xx_probe(struct platform_device *pdev)
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{
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struct wm97xx *wm = platform_get_drvdata(pdev);
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return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
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}
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static int mainstone_wm97xx_remove(struct platform_device *pdev)
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{
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struct wm97xx *wm = platform_get_drvdata(pdev);
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wm97xx_unregister_mach_ops(wm);
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return 0;
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}
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static struct platform_driver mainstone_wm97xx_driver = {
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.probe = mainstone_wm97xx_probe,
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.remove = mainstone_wm97xx_remove,
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.driver = {
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.name = "wm97xx-touch",
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},
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};
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static int __init mainstone_wm97xx_init(void)
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{
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return platform_driver_register(&mainstone_wm97xx_driver);
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}
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static void __exit mainstone_wm97xx_exit(void)
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{
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platform_driver_unregister(&mainstone_wm97xx_driver);
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}
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module_init(mainstone_wm97xx_init);
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module_exit(mainstone_wm97xx_exit);
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/* Module information */
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MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
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MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
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MODULE_LICENSE("GPL");
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