+++ /dev/null
-/*
- * 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 <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(struct timer_list *t)
-{
- struct atmel_wm97xx *atmel_wm97xx = from_timer(atmel_wm97xx, t,
- pen_timer);
-
- atmel_wm97xx_acc_pen_up(atmel_wm97xx->wm);
-}
-
-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)
- 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);
-
- timer_setup(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer, 0);
-
- 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:
- 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);
- kfree(atmel_wm97xx);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int atmel_wm97xx_suspend(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- 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 device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- 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;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(atmel_wm97xx_pm_ops,
- atmel_wm97xx_suspend, atmel_wm97xx_resume);
-
-static struct platform_driver atmel_wm97xx_driver = {
- .remove = __exit_p(atmel_wm97xx_remove),
- .driver = {
- .name = "wm97xx-touch",
- .pm = &atmel_wm97xx_pm_ops,
- },
-};
-
-module_platform_driver_probe(atmel_wm97xx_driver, atmel_wm97xx_probe);
-
-MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
-MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
-MODULE_LICENSE("GPL");
git.samba.org / sfrench / cifs-2.6.git / commitdiff