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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,302 @@ | ||
| /* | ||
| * mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for | ||
| * Wolfson WM97xx AC97 Codecs. | ||
| * | ||
| * Copyright 2004, 2007 Wolfson Microelectronics PLC. | ||
| * Author: Liam Girdwood | ||
| * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com | ||
| * 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 archictecture | ||
| * | ||
| * Features: | ||
| * - codecs supported:- WM9705, WM9712, WM9713 | ||
| * - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/module.h> | ||
| #include <linux/moduleparam.h> | ||
| #include <linux/version.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/init.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/irq.h> | ||
| #include <linux/interrupt.h> | ||
| #include <linux/wm97xx.h> | ||
| #include <linux/io.h> | ||
| #include <asm/arch/pxa-regs.h> | ||
|
|
||
| #define VERSION "0.13" | ||
|
|
||
| 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; | ||
|
|
||
| /* | ||
| * 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; | ||
| } | ||
| #else | ||
| static void wm97xx_acc_pen_up(struct wm97xx *wm) | ||
| { | ||
| int count = 16; | ||
| schedule_timeout_uninterruptible(1); | ||
|
|
||
| while (count < 16) { | ||
| MODR; | ||
| count--; | ||
| } | ||
| } | ||
| #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 | ||
| * threashold 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; | ||
|
|
||
| /* are samples valid */ | ||
| if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X || | ||
| (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y || | ||
| (p & WM97XX_ADCSRC_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_sync(wm->input_dev); | ||
| reads++; | ||
| } while (reads < cinfo[sp_idx].reads); | ||
| up: | ||
| return RC_PENDOWN | RC_AGAIN; | ||
| } | ||
|
|
||
| static int wm97xx_acc_startup(struct wm97xx *wm) | ||
| { | ||
| int idx = 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); | ||
|
|
||
| /* codec specific irq config */ | ||
| if (pen_int) { | ||
| switch (wm->id) { | ||
| case WM9705_ID2: | ||
| wm->pen_irq = IRQ_GPIO(4); | ||
| set_irq_type(IRQ_GPIO(4), IRQT_BOTHEDGE); | ||
| break; | ||
| case WM9712_ID2: | ||
| case WM9713_ID2: | ||
| /* enable pen down interrupt */ | ||
| /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ | ||
| wm->pen_irq = MAINSTONE_AC97_IRQ; | ||
| 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; | ||
| } | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static void wm97xx_acc_shutdown(struct wm97xx *wm) | ||
| { | ||
| /* codec specific deconfig */ | ||
| if (pen_int) { | ||
| switch (wm->id & 0xffff) { | ||
| case WM9705_ID2: | ||
| wm->pen_irq = 0; | ||
| break; | ||
| case WM9712_ID2: | ||
| case WM9713_ID2: | ||
| /* disable interrupt */ | ||
| wm->pen_irq = 0; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | ||
| { | ||
| if (enable) | ||
| enable_irq(wm->pen_irq); | ||
| else | ||
| disable_irq(wm->pen_irq); | ||
| } | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| static int mainstone_wm97xx_remove(struct platform_device *pdev) | ||
| { | ||
| struct wm97xx *wm = platform_get_drvdata(pdev); | ||
|
|
||
| wm97xx_unregister_mach_ops(wm); | ||
| return 0; | ||
| } | ||
|
|
||
| static struct platform_driver mainstone_wm97xx_driver = { | ||
| .probe = mainstone_wm97xx_probe, | ||
| .remove = mainstone_wm97xx_remove, | ||
| .driver = { | ||
| .name = "wm97xx-touch", | ||
| }, | ||
| }; | ||
|
|
||
| static int __init mainstone_wm97xx_init(void) | ||
| { | ||
| return platform_driver_register(&mainstone_wm97xx_driver); | ||
| } | ||
|
|
||
| static void __exit mainstone_wm97xx_exit(void) | ||
| { | ||
| platform_driver_unregister(&mainstone_wm97xx_driver); | ||
| } | ||
|
|
||
| module_init(mainstone_wm97xx_init); | ||
| module_exit(mainstone_wm97xx_exit); | ||
|
|
||
| /* Module information */ | ||
| MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); | ||
| MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); | ||
| MODULE_LICENSE("GPL"); |
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