[ARM] 4506/1: HP Jornada 7XX: Addition of SSP Platform Driver (69ebb222) · Commits · e / devices / android_kernel_fairphone_FP4

arch/arm/mach-sa1100/Kconfig

+11 −2

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		@@ -101,6 +101,16 @@ config SA1100_JORNADA720
		handheld computer. See <http://www.hp.com/jornada/products/720>
		for details.

		config SA1100_JORNADA720_SSP
		bool "HP Jornada 720 Extended SSP driver"
		select SA1100_SSP
		depends on SA1100_JORNADA720
		help
		Say Y here if you have a HP Jornada 7xx handheld computer and you
		want to access devices connected to the MCU. Those include the
		keyboard, touchscreen, backlight and battery. This driver also activates
		the generic SSP which it extends.

		config SA1100_HACKKIT
		bool "HackKit Core CPU Board"
		help
		@@ -145,8 +155,7 @@ config SA1100_SSP
		help
		Say Y here to enable support for the generic PIO SSP driver.
		This isn't for audio support, but for attached sensors and
		other devices, eg for BadgePAD 4 sensor support, or Jornada
		720 touchscreen support.
		other devices, eg for BadgePAD 4 sensor support.

		config H3600_SLEEVE
		tristate "Compaq iPAQ Handheld sleeve support"

arch/arm/mach-sa1100/Makefile

+2 −0

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		@@ -31,6 +31,7 @@ obj-$(CONFIG_SA1100_HACKKIT) += hackkit.o
		led-$(CONFIG_SA1100_HACKKIT) += leds-hackkit.o

		obj-$(CONFIG_SA1100_JORNADA720) += jornada720.o
		obj-$(CONFIG_SA1100_JORNADA720_SSP) += jornada720_ssp.o

		obj-$(CONFIG_SA1100_LART) += lart.o
		led-$(CONFIG_SA1100_LART) += leds-lart.o
		@@ -51,3 +52,4 @@ obj-$(CONFIG_LEDS) += $(led-y)
		# Miscelaneous functions
		obj-$(CONFIG_PM) += pm.o sleep.o
		obj-$(CONFIG_SA1100_SSP) += ssp.o

arch/arm/mach-sa1100/jornada720_ssp.c

0 → 100644

+201 −0

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		/**
		* arch/arm/mac-sa1100/jornada720_ssp.c
		*
		* Copyright (C) 2006/2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
		* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
		*
		* 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.
		*
		* SSP driver for the HP Jornada 710/720/728
		*/

		#include <linux/delay.h>
		#include <linux/errno.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/sched.h>
		#include <linux/slab.h>

		#include <asm/hardware.h>
		#include <asm/hardware/ssp.h>
		#include <asm/arch/jornada720.h>

		static DEFINE_SPINLOCK(jornada_ssp_lock);
		static unsigned long jornada_ssp_flags;

		/**
		* jornada_ssp_reverse - reverses input byte
		*
		* we need to reverse all data we recieve from the mcu due to its physical location
		* returns : 01110111 -> 11101110
		*/
		u8 inline jornada_ssp_reverse(u8 byte)
		{
		return
		((0x80 & byte) >> 7) \|
		((0x40 & byte) >> 5) \|
		((0x20 & byte) >> 3) \|
		((0x10 & byte) >> 1) \|
		((0x08 & byte) << 1) \|
		((0x04 & byte) << 3) \|
		((0x02 & byte) << 5) \|
		((0x01 & byte) << 7);
		};
		EXPORT_SYMBOL(jornada_ssp_reverse);

		/**
		* jornada_ssp_byte - waits for ready ssp bus and sends byte
		*
		* waits for fifo buffer to clear and then transmits, if it doesn't then we will
		* timeout after <timeout> rounds. Needs mcu running before its called.
		*
		* returns : %mcu output on success
		* : %-ETIMEOUT on timeout
		*/
		int jornada_ssp_byte(u8 byte)
		{
		int timeout = 400000;
		u16 ret;

		while ((GPLR & GPIO_GPIO10)) {
		if (!--timeout) {
		printk(KERN_WARNING "SSP: timeout while waiting for transmit\n");
		return -ETIMEDOUT;
		}
		cpu_relax();
		}

		ret = jornada_ssp_reverse(byte) << 8;

		ssp_write_word(ret);
		ssp_read_word(&ret);

		return jornada_ssp_reverse(ret);
		};
		EXPORT_SYMBOL(jornada_ssp_byte);

		/**
		* jornada_ssp_inout - decide if input is command or trading byte
		*
		* returns : (jornada_ssp_byte(byte)) on success
		* : %-ETIMEOUT on timeout failure
		*/
		int jornada_ssp_inout(u8 byte)
		{
		int ret, i;

		/* true means command byte */
		if (byte != TXDUMMY) {
		ret = jornada_ssp_byte(byte);
		/* Proper return to commands is TxDummy */
		if (ret != TXDUMMY) {
		for (i = 0; i < 256; i++)/* flushing bus */
		if (jornada_ssp_byte(TXDUMMY) == -1)
		break;
		return -ETIMEDOUT;
		}
		} else /* Exchange TxDummy for data */
		ret = jornada_ssp_byte(TXDUMMY);

		return ret;
		};
		EXPORT_SYMBOL(jornada_ssp_inout);

		/**
		* jornada_ssp_start - enable mcu
		*
		*/
		int jornada_ssp_start()
		{
		spin_lock_irqsave(&jornada_ssp_lock, jornada_ssp_flags);
		GPCR = GPIO_GPIO25;
		udelay(50);
		return 0;
		};
		EXPORT_SYMBOL(jornada_ssp_start);

		/**
		* jornada_ssp_end - disable mcu and turn off lock
		*
		*/
		int jornada_ssp_end()
		{
		GPSR = GPIO_GPIO25;
		spin_unlock_irqrestore(&jornada_ssp_lock, jornada_ssp_flags);
		return 0;
		};
		EXPORT_SYMBOL(jornada_ssp_end);

		static int __init jornada_ssp_probe(struct platform_device *dev)
		{
		int ret;

		GPSR = GPIO_GPIO25;

		ret = ssp_init();

		/* worked fine, lets not bother with anything else */
		if (!ret) {
		printk(KERN_INFO "SSP: device initialized with irq\n");
		return ret;
		}

		printk(KERN_WARNING "SSP: initialization failed, trying non-irq solution \n");

		/* init of Serial 4 port */
		Ser4MCCR0 = 0;
		Ser4SSCR0 = 0x0387;
		Ser4SSCR1 = 0x18;

		/* clear out any left over data */
		ssp_flush();

		/* enable MCU */
		jornada_ssp_start();

		/* see if return value makes sense */
		ret = jornada_ssp_inout(GETBRIGHTNESS);

		/* seems like it worked, just feed it with TxDummy to get rid of data */
		if (ret == TxDummy)
		jornada_ssp_inout(TXDUMMY);

		jornada_ssp_end();

		/* failed, lets just kill everything */
		if (ret == -ETIMEDOUT) {
		printk(KERN_WARNING "SSP: attempts failed, bailing\n");
		ssp_exit();
		return -ENODEV;
		}

		/* all fine */
		printk(KERN_INFO "SSP: device initialized\n");
		return 0;
		};

		static int jornada_ssp_remove(struct platform_device *dev)
		{
		/* Note that this doesnt actually remove the driver, since theres nothing to remove
		* It just makes sure everything is turned off */
		GPSR = GPIO_GPIO25;
		ssp_exit();
		return 0;
		};

		struct platform_driver jornadassp_driver = {
		.probe = jornada_ssp_probe,
		.remove = jornada_ssp_remove,
		.driver = {
		.name = "jornada_ssp",
		},
		};

		static int __init jornada_ssp_init(void)
		{
		return platform_driver_register(&jornadassp_driver);
		}

include/asm-arm/arch-sa1100/jornada720.h

0 → 100644

+27 −0

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		/*
		* include/asm-arm/arch-sa1100/jornada720.h
		*
		* This file contains SSP/MCU communication definitions for HP Jornada 710/720/728
		*
		* Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
		* Copyright (C) 2000 John Ankcorn <jca@lcs.mit.edu>
		*
		* 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.
		*
		*/

		/* HP Jornada 7xx microprocessor commands */
		#define GETBATTERYDATA 0xc0
		#define GETSCANKEYCODE 0x90
		#define GETTOUCHSAMPLES 0xa0
		#define GETCONTRAST 0xD0
		#define SETCONTRAST 0xD1
		#define GETBRIGHTNESS 0xD2
		#define SETBRIGHTNESS 0xD3
		#define CONTRASTOFF 0xD8
		#define BRIGHTNESSOFF 0xD9
		#define PWMOFF 0xDF
		#define TXDUMMY 0x11
		#define ERRORCODE 0x00