cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/touchscreen/mainstone-wm97xx.c

/*
 * mainstone-wm97xx.c  --  Mainstone Continuous Touch screen driver for
 *                         Wolfson WM97xx AC97 Codecs.
 *
 * Copyright 2004, 2007 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 * Parts Copyright : Ian Molton <spyro@f2s.com>
 *                   Andrew Zabolotny <zap@homelink.ru>
 *
 *  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.
 *
 * Notes:
 *     This is a wm97xx extended touch driver to capture touch
 *     data in a continuous manner on the Intel XScale architecture
 *
 *  Features:
 *       - codecs supported:- WM9705, WM9712, WM9713
 *       - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/wm97xx.h>
#include <linux/io.h>
#include <linux/gpio.h>

#include <mach/regs-ac97.h>

#include <asm/mach-types.h>


struct continuous {
	
u16 id;    /* codec id */
	
u8 code;   /* continuous code */
	
u8 reads;  /* number of coord reads per read cycle */
	
u32 speed; /* number of coords per second */
};


#define WM_READS(sp) ((sp / HZ) + 1)


static const struct continuous cinfo[] = {
	{WM9705_ID2, 0, WM_READS(94), 94},
	{WM9705_ID2, 1, WM_READS(188), 188},
	{WM9705_ID2, 2, WM_READS(375), 375},
	{WM9705_ID2, 3, WM_READS(750), 750},
	{WM9712_ID2, 0, WM_READS(94), 94},
	{WM9712_ID2, 1, WM_READS(188), 188},
	{WM9712_ID2, 2, WM_READS(375), 375},
	{WM9712_ID2, 3, WM_READS(750), 750},
	{WM9713_ID2, 0, WM_READS(94), 94},
	{WM9713_ID2, 1, WM_READS(120), 120},
	{WM9713_ID2, 2, WM_READS(154), 154},
	{WM9713_ID2, 3, WM_READS(188), 188},
};

/* continuous speed index */

static int sp_idx;


static u16 last, tries;

static int irq;

/*
 * Pen sampling frequency (Hz) in continuous mode.
 */

static int cont_rate = 200;
module_param(cont_rate, int, 0);
MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");

/*
 * Pen down detection.
 *
 * This driver can either poll or use an interrupt to indicate a pen down
 * event. If the irq request fails then it will fall back to polling mode.
 */

static int pen_int;
module_param(pen_int, int, 0);
MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");

/*
 * Pressure readback.
 *
 * Set to 1 to read back pen down pressure
 */

static int pressure;
module_param(pressure, int, 0);
MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");

/*
 * AC97 touch data slot.
 *
 * Touch screen readback data ac97 slot
 */

static int ac97_touch_slot = 5;
module_param(ac97_touch_slot, int, 0);
MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");


/* flush AC97 slot 5 FIFO on pxa machines */
#ifdef CONFIG_PXA27x

static void wm97xx_acc_pen_up(struct wm97xx *wm) { schedule_timeout_uninterruptible(1); while (MISR & (1 << 2)) MODR; }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown28100.00%1100.00%
Total28100.00%1100.00%

#else
static void wm97xx_acc_pen_up(struct wm97xx *wm) { unsigned int count; schedule_timeout_uninterruptible(1); for (count = 0; count < 16; count++) MODR; }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown2468.57%150.00%
Jiri Slaby1131.43%150.00%
Total35100.00%2100.00%

#endif
static int wm97xx_acc_pen_down(struct wm97xx *wm) { u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; int reads = 0; /* When the AC97 queue has been drained we need to allow time * to buffer up samples otherwise we end up spinning polling * for samples. The controller can't have a suitably low * threshold set to use the notifications it gives. */ schedule_timeout_uninterruptible(1); if (tries > 5) { tries = 0; return RC_PENUP; } x = MODR; if (x == last) { tries++; return RC_AGAIN; } last = x; do { if (reads) x = MODR; y = MODR; if (pressure) p = MODR; dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n", x, y, p); /* are samples valid */ if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X || (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y || (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES) goto up; /* coordinate is good */ tries = 0; input_report_abs(wm->input_dev, ABS_X, x & 0xfff); input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); input_sync(wm->input_dev); reads++; } while (reads < cinfo[sp_idx].reads); up: return RC_PENDOWN | RC_AGAIN; }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown20791.59%240.00%
Mike Rapoport156.64%120.00%
Wolfram Sang31.33%120.00%
André Goddard Rosa10.44%120.00%
Total226100.00%5100.00%


static int wm97xx_acc_startup(struct wm97xx *wm) { int idx = 0, ret = 0; /* check we have a codec */ if (wm->ac97 == NULL) return -ENODEV; /* Go you big red fire engine */ for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { if (wm->id != cinfo[idx].id) continue; sp_idx = idx; if (cont_rate <= cinfo[idx].speed) break; } wm->acc_rate = cinfo[sp_idx].code; wm->acc_slot = ac97_touch_slot; dev_info(wm->dev, "mainstone accelerated touchscreen driver, %d samples/sec\n", cinfo[sp_idx].speed); /* IRQ driven touchscreen is used on Palm hardware */ if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) { pen_int = 1; irq = 27; /* There is some obscure mutant of WM9712 interbred with WM9713 * used on Palm HW */ wm->variant = WM97xx_WM1613; } else if (machine_is_mainstone() && pen_int) irq = 4; if (irq) { ret = gpio_request(irq, "Touchscreen IRQ"); if (ret) goto out; ret = gpio_direction_input(irq); if (ret) { gpio_free(irq); goto out; } wm->pen_irq = gpio_to_irq(irq); irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH); } else /* pen irq not supported */ pen_int = 0; /* codec specific irq config */ if (pen_int) { switch (wm->id) { case WM9705_ID2: break; case WM9712_ID2: case WM9713_ID2: /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, WM97XX_GPIO_POL_HIGH, WM97XX_GPIO_STICKY, WM97XX_GPIO_WAKE); wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, WM97XX_GPIO_POL_HIGH, WM97XX_GPIO_NOTSTICKY, WM97XX_GPIO_NOWAKE); break; default: dev_err(wm->dev, "pen down irq not supported on this device\n"); pen_int = 0; break; } } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown18862.67%120.00%
Marek Vašut11036.67%240.00%
Thomas Gleixner10.33%120.00%
Dmitry Baryshkov10.33%120.00%
Total300100.00%5100.00%


static void wm97xx_acc_shutdown(struct wm97xx *wm) { /* codec specific deconfig */ if (pen_int) { if (irq) gpio_free(irq); wm->pen_irq = 0; } }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown2781.82%150.00%
Marek Vašut618.18%150.00%
Total33100.00%2100.00%


static void wm97xx_irq_enable(struct wm97xx *wm, int enable) { if (enable) enable_irq(wm->pen_irq); else disable_irq_nosync(wm->pen_irq); }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown33100.00%2100.00%
Total33100.00%2100.00%

static struct wm97xx_mach_ops mainstone_mach_ops = { .acc_enabled = 1, .acc_pen_up = wm97xx_acc_pen_up, .acc_pen_down = wm97xx_acc_pen_down, .acc_startup = wm97xx_acc_startup, .acc_shutdown = wm97xx_acc_shutdown, .irq_enable = wm97xx_irq_enable, .irq_gpio = WM97XX_GPIO_2, };
static int mainstone_wm97xx_probe(struct platform_device *pdev) { struct wm97xx *wm = platform_get_drvdata(pdev); return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown30100.00%1100.00%
Total30100.00%1100.00%


static int mainstone_wm97xx_remove(struct platform_device *pdev) { struct wm97xx *wm = platform_get_drvdata(pdev); wm97xx_unregister_mach_ops(wm); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mark Brown29100.00%1100.00%
Total29100.00%1100.00%

static struct platform_driver mainstone_wm97xx_driver = { .probe = mainstone_wm97xx_probe, .remove = mainstone_wm97xx_remove, .driver = { .name = "wm97xx-touch", }, }; module_platform_driver(mainstone_wm97xx_driver); /* Module information */ MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Mark Brown97985.73%321.43%
Marek Vašut12611.03%214.29%
Mike Rapoport151.31%17.14%
Jiri Slaby110.96%17.14%
Wolfram Sang30.26%17.14%
JJ Ding20.18%17.14%
André Goddard Rosa20.18%17.14%
Dmitry Baryshkov10.09%17.14%
Liam Girdwood10.09%17.14%
Thomas Gleixner10.09%17.14%
Eric Miao10.09%17.14%
Total1142100.00%14100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.