Messages in this thread | | | Date | Mon, 14 Jan 2008 10:56:06 +0100 | From | Marc Kleine-Budde <> | Subject | Re: [PATCH 5/6] Driver for WM97xx touchscreens in streaming mode on PXA2xx systems |
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reMark Brown wrote: > 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> > Cc: Stanley Cai <stanley.cai@intel.com> > Cc: Rodolfo Giometti <giometti@enneenne.com> > Cc: Russell King <rmk@arm.linux.org.uk> > Cc: Marc Kleine-Budde <mkl@penugtronix.de> ^^ it's mkl@pengutronix.de
> Cc: Ian Molton <spyro@f2s.com> > Cc: Vince Sanders <vince@kyllikki.org> > Cc: Andrew Zabolotny <zap@homelink.ru> > --- > drivers/input/touchscreen/pxa-wm97xx.c | 298 ++++++++++++++++++++++++++++++++ > 1 files changed, 298 insertions(+), 0 deletions(-) > create mode 100644 drivers/input/touchscreen/pxa-wm97xx.c > > diff --git a/drivers/input/touchscreen/pxa-wm97xx.c b/drivers/input/touchscreen/pxa-wm97xx.c > new file mode 100644 > index 0000000..870508a > --- /dev/null > +++ b/drivers/input/touchscreen/pxa-wm97xx.c > @@ -0,0 +1,298 @@ > +/* > + * pxa-wm97xx.c -- pxa-wm97xx Continuous Touch screen driver for > + * Wolfson WM97xx AC97 Codecs. > + * > + * Copyright 2004 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) > +{ > + set_current_state(TASK_INTERRUPTIBLE); > + schedule_timeout(1); > + > + while (MISR & (1 << 2)) > + MODR; > +} > +#else > +static void wm97xx_acc_pen_up(struct wm97xx *wm) > +{ > + int count = 16; > + set_current_state(TASK_INTERRUPTIBLE); > + schedule_timeout(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; > + > + /* data is never immediately available after pen down irq */ > + set_current_state(TASK_INTERRUPTIBLE); > + schedule_timeout(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 & 0x7000) != WM97XX_ADCSEL_X || > + (y & 0x7000) != WM97XX_ADCSEL_Y || > + (p & 0x7000) != 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, > + "pxa2xx 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;
I'm missing some kind of abstraction here, what about non mainstone boards with the pen irq wired to some other gpio?
> + 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 pxa_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, > +}; > + > +static int pxa_wm97xx_probe(struct device *dev) > +{ > + struct wm97xx *wm = dev->driver_data; > + return wm97xx_register_mach_ops(wm, &pxa_mach_ops); > +} > + > +static int pxa_wm97xx_remove(struct device *dev) > +{ > + struct wm97xx *wm = dev->driver_data; > + wm97xx_unregister_mach_ops(wm); > + return 0; > +} > + > +static struct device_driver pxa_wm97xx_driver = { > + .name = "wm97xx-touchscreen", > + .bus = &wm97xx_bus_type, > + .owner = THIS_MODULE, > + .probe = pxa_wm97xx_probe, > + .remove = pxa_wm97xx_remove > +}; > + > +static int __init pxa_wm97xx_init(void) > +{ > + return driver_register(&pxa_wm97xx_driver); > +} > + > +static void __exit pxa_wm97xx_exit(void) > +{ > + driver_unregister(&pxa_wm97xx_driver); > +} > + > +module_init(pxa_wm97xx_init); > +module_exit(pxa_wm97xx_exit); > + > +/* Module information */ > +MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); > +MODULE_DESCRIPTION("wm97xx continuous touch driver for pxa2xx"); > +MODULE_LICENSE("GPL");
regards - Marc
-- Marc Kleine-Budde Phone: +49-231-2826-924 Pengutronix - Linux Solutions for Science and Industry Vertretung West/Dortmund http://www.pengutronix.de
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