linux_old1/drivers/input/touchscreen/atmel-wm97xx.c

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/*
* Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97
* codecs.
*
* Copyright (C) 2008 - 2009 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleparam.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/timer.h>
#include <linux/gpio.h>
#include <linux/io.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#define AC97C_ICA 0x10
#define AC97C_CBRHR 0x30
#define AC97C_CBSR 0x38
#define AC97C_CBMR 0x3c
#define AC97C_IER 0x54
#define AC97C_IDR 0x58
#define AC97C_RXRDY (1 << 4)
#define AC97C_OVRUN (1 << 5)
#define AC97C_CMR_SIZE_20 (0 << 16)
#define AC97C_CMR_SIZE_18 (1 << 16)
#define AC97C_CMR_SIZE_16 (2 << 16)
#define AC97C_CMR_SIZE_10 (3 << 16)
#define AC97C_CMR_CEM_LITTLE (1 << 18)
#define AC97C_CMR_CEM_BIG (0 << 18)
#define AC97C_CMR_CENA (1 << 21)
#define AC97C_INT_CBEVT (1 << 4)
#define AC97C_SR_CAEVT (1 << 3)
#define AC97C_CH_MASK(slot) \
(0x7 << (3 * (slot - 3)))
#define AC97C_CH_ASSIGN(slot, channel) \
(AC97C_CHANNEL_##channel << (3 * (slot - 3)))
#define AC97C_CHANNEL_NONE 0x0
#define AC97C_CHANNEL_B 0x2
#define ac97c_writel(chip, reg, val) \
__raw_writel((val), (chip)->regs + AC97C_##reg)
#define ac97c_readl(chip, reg) \
__raw_readl((chip)->regs + AC97C_##reg)
#ifdef CONFIG_CPU_AT32AP700X
#define ATMEL_WM97XX_AC97C_IOMEM (0xfff02800)
#define ATMEL_WM97XX_AC97C_IRQ (29)
#define ATMEL_WM97XX_GPIO_DEFAULT (32+16) /* Pin 16 on port B. */
#else
#error Unknown CPU, this driver only supports AT32AP700X CPUs.
#endif
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;
/*
* Pen sampling frequency (Hz) in continuous mode.
*/
static int cont_rate = 188;
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 = 1;
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");
/*
* GPIO line number.
*
* Set to GPIO number where the signal from the WM97xx device is hooked up.
*/
static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
module_param(atmel_gpio_line, int, 0);
MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");
struct atmel_wm97xx {
struct wm97xx *wm;
struct timer_list pen_timer;
void __iomem *regs;
unsigned long ac97c_irq;
unsigned long gpio_pen;
unsigned long gpio_irq;
unsigned short x;
unsigned short y;
};
static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
{
struct atmel_wm97xx *atmel_wm97xx = dev_id;
struct wm97xx *wm = atmel_wm97xx->wm;
int status = ac97c_readl(atmel_wm97xx, CBSR);
irqreturn_t retval = IRQ_NONE;
if (status & AC97C_OVRUN) {
dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
ac97c_readl(atmel_wm97xx, CBRHR);
retval = IRQ_HANDLED;
} else if (status & AC97C_RXRDY) {
u16 data;
u16 value;
u16 source;
u16 pen_down;
data = ac97c_readl(atmel_wm97xx, CBRHR);
value = data & 0x0fff;
source = data & WM97XX_ADCSEL_MASK;
pen_down = (data & WM97XX_PEN_DOWN) >> 8;
if (source == WM97XX_ADCSEL_X)
atmel_wm97xx->x = value;
if (source == WM97XX_ADCSEL_Y)
atmel_wm97xx->y = value;
if (!pressure && source == WM97XX_ADCSEL_Y) {
input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
input_sync(wm->input_dev);
} else if (pressure && source == WM97XX_ADCSEL_PRES) {
input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
input_report_abs(wm->input_dev, ABS_PRESSURE, value);
input_report_key(wm->input_dev, BTN_TOUCH, value);
input_sync(wm->input_dev);
}
retval = IRQ_HANDLED;
}
return retval;
}
static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
{
struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
struct input_dev *input_dev = wm->input_dev;
int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);
if (pen_down != 0) {
mod_timer(&atmel_wm97xx->pen_timer,
jiffies + msecs_to_jiffies(1));
} else {
if (pressure)
input_report_abs(input_dev, ABS_PRESSURE, 0);
input_report_key(input_dev, BTN_TOUCH, 0);
input_sync(input_dev);
}
}
static void atmel_wm97xx_pen_timer(unsigned long data)
{
atmel_wm97xx_acc_pen_up((struct wm97xx *)data);
}
static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
{
struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
int idx = 0;
if (wm->ac97 == NULL)
return -ENODEV;
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->touch_dev->dev, "atmel accelerated touchscreen driver, "
"%d samples/sec\n", cinfo[sp_idx].speed);
if (pen_int) {
unsigned long reg;
wm->pen_irq = atmel_wm97xx->gpio_irq;
switch (wm->id) {
case WM9712_ID2: /* Fall through. */
case WM9713_ID2:
/*
* Use GPIO 13 (PEN_DOWN) to assert GPIO line 3
* (PENDOWN).
*/
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_3, WM97XX_GPIO_OUT,
WM97XX_GPIO_POL_HIGH,
WM97XX_GPIO_NOTSTICKY,
WM97XX_GPIO_NOWAKE);
case WM9705_ID2: /* Fall through. */
/*
* Enable touch data slot in AC97 controller channel B.
*/
reg = ac97c_readl(atmel_wm97xx, ICA);
reg &= ~AC97C_CH_MASK(wm->acc_slot);
reg |= AC97C_CH_ASSIGN(wm->acc_slot, B);
ac97c_writel(atmel_wm97xx, ICA, reg);
/*
* Enable channel and interrupt for RXRDY and OVERRUN.
*/
ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
| AC97C_CMR_CEM_BIG
| AC97C_CMR_SIZE_16
| AC97C_OVRUN
| AC97C_RXRDY);
/* Dummy read to empty RXRHR. */
ac97c_readl(atmel_wm97xx, CBRHR);
/*
* Enable interrupt for channel B in the AC97
* controller.
*/
ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
break;
default:
dev_err(&wm->touch_dev->dev, "pen down irq not "
"supported on this device\n");
pen_int = 0;
break;
}
}
return 0;
}
static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
{
if (pen_int) {
struct atmel_wm97xx *atmel_wm97xx =
platform_get_drvdata(wm->touch_dev);
unsigned long ica;
switch (wm->id & 0xffff) {
case WM9705_ID2: /* Fall through. */
case WM9712_ID2: /* Fall through. */
case WM9713_ID2:
/* Disable slot and turn off channel B interrupts. */
ica = ac97c_readl(atmel_wm97xx, ICA);
ica &= ~AC97C_CH_MASK(wm->acc_slot);
ac97c_writel(atmel_wm97xx, ICA, ica);
ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
ac97c_writel(atmel_wm97xx, CBMR, 0);
wm->pen_irq = 0;
break;
default:
dev_err(&wm->touch_dev->dev, "unknown codec\n");
break;
}
}
}
static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
{
/* Intentionally left empty. */
}
static struct wm97xx_mach_ops atmel_mach_ops = {
.acc_enabled = 1,
.acc_pen_up = atmel_wm97xx_acc_pen_up,
.acc_startup = atmel_wm97xx_acc_startup,
.acc_shutdown = atmel_wm97xx_acc_shutdown,
.irq_enable = atmel_wm97xx_irq_enable,
.irq_gpio = WM97XX_GPIO_3,
};
static int __init atmel_wm97xx_probe(struct platform_device *pdev)
{
struct wm97xx *wm = platform_get_drvdata(pdev);
struct atmel_wm97xx *atmel_wm97xx;
int ret;
atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
if (!atmel_wm97xx) {
dev_dbg(&pdev->dev, "out of memory\n");
return -ENOMEM;
}
atmel_wm97xx->wm = wm;
atmel_wm97xx->regs = (void *)ATMEL_WM97XX_AC97C_IOMEM;
atmel_wm97xx->ac97c_irq = ATMEL_WM97XX_AC97C_IRQ;
atmel_wm97xx->gpio_pen = atmel_gpio_line;
atmel_wm97xx->gpio_irq = gpio_to_irq(atmel_wm97xx->gpio_pen);
setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer,
(unsigned long)wm);
ret = request_irq(atmel_wm97xx->ac97c_irq,
atmel_wm97xx_channel_b_interrupt,
IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
if (ret) {
dev_dbg(&pdev->dev, "could not request ac97c irq\n");
goto err;
}
platform_set_drvdata(pdev, atmel_wm97xx);
ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
if (ret)
goto err_irq;
return ret;
err_irq:
free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
err:
platform_set_drvdata(pdev, NULL);
kfree(atmel_wm97xx);
return ret;
}
static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
{
struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
struct wm97xx *wm = atmel_wm97xx->wm;
ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
del_timer_sync(&atmel_wm97xx->pen_timer);
wm97xx_unregister_mach_ops(wm);
platform_set_drvdata(pdev, NULL);
kfree(atmel_wm97xx);
return 0;
}
#ifdef CONFIG_PM
static int atmel_wm97xx_suspend(struct platform_device *pdev, pm_message_t msg)
{
struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
disable_irq(atmel_wm97xx->gpio_irq);
del_timer_sync(&atmel_wm97xx->pen_timer);
return 0;
}
static int atmel_wm97xx_resume(struct platform_device *pdev)
{
struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
struct wm97xx *wm = atmel_wm97xx->wm;
if (wm->input_dev->users) {
enable_irq(atmel_wm97xx->gpio_irq);
ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
}
return 0;
}
#else
#define atmel_wm97xx_suspend NULL
#define atmel_wm97xx_resume NULL
#endif
static struct platform_driver atmel_wm97xx_driver = {
.remove = __exit_p(atmel_wm97xx_remove),
.driver = {
.name = "wm97xx-touch",
},
.suspend = atmel_wm97xx_suspend,
.resume = atmel_wm97xx_resume,
};
static int __init atmel_wm97xx_init(void)
{
return platform_driver_probe(&atmel_wm97xx_driver, atmel_wm97xx_probe);
}
module_init(atmel_wm97xx_init);
static void __exit atmel_wm97xx_exit(void)
{
platform_driver_unregister(&atmel_wm97xx_driver);
}
module_exit(atmel_wm97xx_exit);
MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
MODULE_LICENSE("GPL");