Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 890 insertions, 0 deletions

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
new file mode 100644
index 000000000..51936bde1
--- /dev/null
+++ b/arch/arm/common/locomo.c
@@ -0,0 +1,890 @@
+/*
+ * linux/arch/arm/common/locomo.c
+ *
+ * Sharp LoCoMo support
+ *
+ * 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.
+ *
+ * This file contains all generic LoCoMo support.
+ *
+ * All initialization functions provided here are intended to be called
+ * from machine specific code with proper arguments when required.
+ *
+ * Based on sa1111.c
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <asm/hardware/locomo.h>
+
+/* LoCoMo Interrupts */
+#define IRQ_LOCOMO_KEY		(0)
+#define IRQ_LOCOMO_GPIO		(1)
+#define IRQ_LOCOMO_LT		(2)
+#define IRQ_LOCOMO_SPI		(3)
+
+/* M62332 output channel selection */
+#define M62332_EVR_CH	1	/* M62332 volume channel number  */
+				/*   0 : CH.1 , 1 : CH. 2        */
+/* DAC send data */
+#define	M62332_SLAVE_ADDR	0x4e	/* Slave address  */
+#define	M62332_W_BIT		0x00	/* W bit (0 only) */
+#define	M62332_SUB_ADDR		0x00	/* Sub address    */
+#define	M62332_A_BIT		0x00	/* A bit (0 only) */
+
+/* DAC setup and hold times (expressed in us) */
+#define DAC_BUS_FREE_TIME	5	/*   4.7 us */
+#define DAC_START_SETUP_TIME	5	/*   4.7 us */
+#define DAC_STOP_SETUP_TIME	4	/*   4.0 us */
+#define DAC_START_HOLD_TIME	5	/*   4.7 us */
+#define DAC_SCL_LOW_HOLD_TIME	5	/*   4.7 us */
+#define DAC_SCL_HIGH_HOLD_TIME	4	/*   4.0 us */
+#define DAC_DATA_SETUP_TIME	1	/*   250 ns */
+#define DAC_DATA_HOLD_TIME	1	/*   300 ns */
+#define DAC_LOW_SETUP_TIME	1	/*   300 ns */
+#define DAC_HIGH_SETUP_TIME	1	/*  1000 ns */
+
+/* the following is the overall data for the locomo chip */
+struct locomo {
+	struct device *dev;
+	unsigned long phys;
+	unsigned int irq;
+	int irq_base;
+	spinlock_t lock;
+	void __iomem *base;
+#ifdef CONFIG_PM
+	void *saved_state;
+#endif
+};
+
+struct locomo_dev_info {
+	unsigned long	offset;
+	unsigned long	length;
+	unsigned int	devid;
+	unsigned int	irq[1];
+	const char *	name;
+};
+
+/* All the locomo devices.  If offset is non-zero, the mapbase for the
+ * locomo_dev will be set to the chip base plus offset.  If offset is
+ * zero, then the mapbase for the locomo_dev will be set to zero.  An
+ * offset of zero means the device only uses GPIOs or other helper
+ * functions inside this file */
+static struct locomo_dev_info locomo_devices[] = {
+	{
+		.devid 		= LOCOMO_DEVID_KEYBOARD,
+		.irq		= { IRQ_LOCOMO_KEY },
+		.name		= "locomo-keyboard",
+		.offset		= LOCOMO_KEYBOARD,
+		.length		= 16,
+	},
+	{
+		.devid		= LOCOMO_DEVID_FRONTLIGHT,
+		.irq		= {},
+		.name		= "locomo-frontlight",
+		.offset		= LOCOMO_FRONTLIGHT,
+		.length		= 8,
+
+	},
+	{
+		.devid		= LOCOMO_DEVID_BACKLIGHT,
+		.irq		= {},
+		.name		= "locomo-backlight",
+		.offset		= LOCOMO_BACKLIGHT,
+		.length		= 8,
+	},
+	{
+		.devid		= LOCOMO_DEVID_AUDIO,
+		.irq		= {},
+		.name		= "locomo-audio",
+		.offset		= LOCOMO_AUDIO,
+		.length		= 4,
+	},
+	{
+		.devid		= LOCOMO_DEVID_LED,
+		.irq 		= {},
+		.name		= "locomo-led",
+		.offset		= LOCOMO_LED,
+		.length		= 8,
+	},
+	{
+		.devid		= LOCOMO_DEVID_UART,
+		.irq		= {},
+		.name		= "locomo-uart",
+		.offset		= 0,
+		.length		= 0,
+	},
+	{
+		.devid		= LOCOMO_DEVID_SPI,
+		.irq		= {},
+		.name		= "locomo-spi",
+		.offset		= LOCOMO_SPI,
+		.length		= 0x30,
+	},
+};
+
+static void locomo_handler(struct irq_desc *desc)
+{
+	struct locomo *lchip = irq_desc_get_handler_data(desc);
+	int req, i;
+
+	/* Acknowledge the parent IRQ */
+	desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+	/* check why this interrupt was generated */
+	req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
+
+	if (req) {
+		unsigned int irq;
+
+		/* generate the next interrupt(s) */
+		irq = lchip->irq_base;
+		for (i = 0; i <= 3; i++, irq++) {
+			if (req & (0x0100 << i)) {
+				generic_handle_irq(irq);
+			}
+
+		}
+	}
+}
+
+static void locomo_ack_irq(struct irq_data *d)
+{
+}
+
+static void locomo_mask_irq(struct irq_data *d)
+{
+	struct locomo *lchip = irq_data_get_irq_chip_data(d);
+	unsigned int r;
+	r = locomo_readl(lchip->base + LOCOMO_ICR);
+	r &= ~(0x0010 << (d->irq - lchip->irq_base));
+	locomo_writel(r, lchip->base + LOCOMO_ICR);
+}
+
+static void locomo_unmask_irq(struct irq_data *d)
+{
+	struct locomo *lchip = irq_data_get_irq_chip_data(d);
+	unsigned int r;
+	r = locomo_readl(lchip->base + LOCOMO_ICR);
+	r |= (0x0010 << (d->irq - lchip->irq_base));
+	locomo_writel(r, lchip->base + LOCOMO_ICR);
+}
+
+static struct irq_chip locomo_chip = {
+	.name		= "LOCOMO",
+	.irq_ack	= locomo_ack_irq,
+	.irq_mask	= locomo_mask_irq,
+	.irq_unmask	= locomo_unmask_irq,
+};
+
+static void locomo_setup_irq(struct locomo *lchip)
+{
+	int irq = lchip->irq_base;
+
+	/*
+	 * Install handler for IRQ_LOCOMO_HW.
+	 */
+	irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
+	irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
+
+	/* Install handlers for IRQ_LOCOMO_* */
+	for ( ; irq <= lchip->irq_base + 3; irq++) {
+		irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
+		irq_set_chip_data(irq, lchip);
+		irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
+	}
+}
+
+
+static void locomo_dev_release(struct device *_dev)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+
+	kfree(dev);
+}
+
+static int
+locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
+{
+	struct locomo_dev *dev;
+	int ret;
+
+	dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * If the parent device has a DMA mask associated with it,
+	 * propagate it down to the children.
+	 */
+	if (lchip->dev->dma_mask) {
+		dev->dma_mask = *lchip->dev->dma_mask;
+		dev->dev.dma_mask = &dev->dma_mask;
+	}
+
+	dev_set_name(&dev->dev, "%s", info->name);
+	dev->devid	 = info->devid;
+	dev->dev.parent  = lchip->dev;
+	dev->dev.bus     = &locomo_bus_type;
+	dev->dev.release = locomo_dev_release;
+	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
+
+	if (info->offset)
+		dev->mapbase = lchip->base + info->offset;
+	else
+		dev->mapbase = 0;
+	dev->length = info->length;
+
+	dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
+			NO_IRQ : lchip->irq_base + info->irq[0];
+
+	ret = device_register(&dev->dev);
+	if (ret) {
+ out:
+		kfree(dev);
+	}
+	return ret;
+}
+
+#ifdef CONFIG_PM
+
+struct locomo_save_data {
+	u16	LCM_GPO;
+	u16	LCM_SPICT;
+	u16	LCM_GPE;
+	u16	LCM_ASD;
+	u16	LCM_SPIMD;
+};
+
+static int locomo_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+	struct locomo_save_data *save;
+	unsigned long flags;
+
+	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
+	if (!save)
+		return -ENOMEM;
+
+	lchip->saved_state = save;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
+	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
+	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);	/* SPI */
+	locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
+	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
+	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
+	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
+	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
+	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);	/* SPI */
+	locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
+
+	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
+	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
+	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
+
+	if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
+		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
+	else
+		/* 18MHz already enabled, so no wait */
+		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */
+
+	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
+	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
+	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	return 0;
+}
+
+static int locomo_resume(struct platform_device *dev)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+	struct locomo_save_data *save;
+	unsigned long r;
+	unsigned long flags;
+
+	save = lchip->saved_state;
+	if (!save)
+		return 0;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
+	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
+	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
+	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
+	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
+
+	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
+	locomo_writel(0x90, lchip->base + LOCOMO_TADC);
+
+	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
+	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+	r &= 0xFEFF;
+	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	lchip->saved_state = NULL;
+	kfree(save);
+
+	return 0;
+}
+#endif
+
+
+/**
+ *	locomo_probe - probe for a single LoCoMo chip.
+ *	@phys_addr: physical address of device.
+ *
+ *	Probe for a LoCoMo chip.  This must be called
+ *	before any other locomo-specific code.
+ *
+ *	Returns:
+ *	%-ENODEV	device not found.
+ *	%-EBUSY		physical address already marked in-use.
+ *	%0		successful.
+ */
+static int
+__locomo_probe(struct device *me, struct resource *mem, int irq)
+{
+	struct locomo_platform_data *pdata = me->platform_data;
+	struct locomo *lchip;
+	unsigned long r;
+	int i, ret = -ENODEV;
+
+	lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
+	if (!lchip)
+		return -ENOMEM;
+
+	spin_lock_init(&lchip->lock);
+
+	lchip->dev = me;
+	dev_set_drvdata(lchip->dev, lchip);
+
+	lchip->phys = mem->start;
+	lchip->irq = irq;
+	lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
+
+	/*
+	 * Map the whole region.  This also maps the
+	 * registers for our children.
+	 */
+	lchip->base = ioremap(mem->start, PAGE_SIZE);
+	if (!lchip->base) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* locomo initialize */
+	locomo_writel(0, lchip->base + LOCOMO_ICR);
+	/* KEYBOARD */
+	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+
+	/* GPIO */
+	locomo_writel(0, lchip->base + LOCOMO_GPO);
+	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPE);
+	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPD);
+	locomo_writel(0, lchip->base + LOCOMO_GIE);
+
+	/* Frontlight */
+	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+
+	/* Longtime timer */
+	locomo_writel(0, lchip->base + LOCOMO_LTINT);
+	/* SPI */
+	locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
+	r = locomo_readl(lchip->base + LOCOMO_ASD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_ASD);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
+	r = locomo_readl(lchip->base + LOCOMO_HSD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_HSD);
+
+	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
+
+	/* XON */
+	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
+	udelay(1000);
+	/* CLK9MEN */
+	r = locomo_readl(lchip->base + LOCOMO_TADC);
+	r |= 0x10;
+	locomo_writel(r, lchip->base + LOCOMO_TADC);
+	udelay(100);
+
+	/* init DAC */
+	r = locomo_readl(lchip->base + LOCOMO_DAC);
+	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, lchip->base + LOCOMO_DAC);
+
+	r = locomo_readl(lchip->base + LOCOMO_VER);
+	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
+
+	/*
+	 * The interrupt controller must be initialised before any
+	 * other device to ensure that the interrupts are available.
+	 */
+	if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
+		locomo_setup_irq(lchip);
+
+	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
+		locomo_init_one_child(lchip, &locomo_devices[i]);
+	return 0;
+
+ out:
+	kfree(lchip);
+	return ret;
+}
+
+static int locomo_remove_child(struct device *dev, void *data)
+{
+	device_unregister(dev);
+	return 0;
+} 
+
+static void __locomo_remove(struct locomo *lchip)
+{
+	device_for_each_child(lchip->dev, NULL, locomo_remove_child);
+
+	if (lchip->irq != NO_IRQ) {
+		irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
+	}
+
+	iounmap(lchip->base);
+	kfree(lchip);
+}
+
+static int locomo_probe(struct platform_device *dev)
+{
+	struct resource *mem;
+	int irq;
+
+	mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0)
+		return -ENXIO;
+
+	return __locomo_probe(&dev->dev, mem, irq);
+}
+
+static int locomo_remove(struct platform_device *dev)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+
+	if (lchip) {
+		__locomo_remove(lchip);
+		platform_set_drvdata(dev, NULL);
+	}
+
+	return 0;
+}
+
+/*
+ *	Not sure if this should be on the system bus or not yet.
+ *	We really want some way to register a system device at
+ *	the per-machine level, and then have this driver pick
+ *	up the registered devices.
+ */
+static struct platform_driver locomo_device_driver = {
+	.probe		= locomo_probe,
+	.remove		= locomo_remove,
+#ifdef CONFIG_PM
+	.suspend	= locomo_suspend,
+	.resume		= locomo_resume,
+#endif
+	.driver		= {
+		.name	= "locomo",
+	},
+};
+
+/*
+ *	Get the parent device driver (us) structure
+ *	from a child function device
+ */
+static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
+{
+	return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
+}
+
+void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int r;
+
+	if (!lchip)
+		return;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPD);
+	if (dir)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPD);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPE);
+	if (dir)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPE);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_gpio_set_dir);
+
+int locomo_gpio_read_level(struct device *dev, unsigned int bits)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int ret;
+
+	if (!lchip)
+		return -ENODEV;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	ret = locomo_readl(lchip->base + LOCOMO_GPL);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	ret &= bits;
+	return ret;
+}
+EXPORT_SYMBOL(locomo_gpio_read_level);
+
+int locomo_gpio_read_output(struct device *dev, unsigned int bits)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int ret;
+
+	if (!lchip)
+		return -ENODEV;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	ret = locomo_readl(lchip->base + LOCOMO_GPO);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	ret &= bits;
+	return ret;
+}
+EXPORT_SYMBOL(locomo_gpio_read_output);
+
+void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int r;
+
+	if (!lchip)
+		return;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPO);
+	if (set)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPO);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_gpio_write);
+
+static void locomo_m62332_sendbit(void *mapbase, int bit)
+{
+	unsigned int r;
+
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+
+	if (bit & 1) {
+		r = locomo_readl(mapbase + LOCOMO_DAC);
+		r |=  LOCOMO_DAC_SDAOEB;
+		locomo_writel(r, mapbase + LOCOMO_DAC);
+		udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	} else {
+		r = locomo_readl(mapbase + LOCOMO_DAC);
+		r &=  ~(LOCOMO_DAC_SDAOEB);
+		locomo_writel(r, mapbase + LOCOMO_DAC);
+		udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	}
+
+	udelay(DAC_DATA_SETUP_TIME);	/* 250 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/*  4.0 usec */
+}
+
+void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
+{
+	struct locomo *lchip = locomo_chip_driver(ldev);
+	int i;
+	unsigned char data;
+	unsigned int r;
+	void *mapbase = lchip->base;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	/* Start */
+	udelay(DAC_BUS_FREE_TIME);	/* 5.0 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.0 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_START_HOLD_TIME);	/* 5.0 usec */
+	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
+
+	/* Send slave address and W bit (LSB is W bit) */
+	data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
+		goto out;
+	}
+
+	/* Send Sub address (LSB is channel select) */
+	/*    channel = 0 : ch1 select              */
+	/*            = 1 : ch2 select              */
+	data = M62332_SUB_ADDR + channel;
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
+		goto out;
+	}
+
+	/* Send DAC data */
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
+	}
+
+out:
+	/* stop */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
+
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_m62332_senddata);
+
+/*
+ *	Frontlight control
+ */
+
+void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
+{
+	unsigned long flags;
+	struct locomo *lchip = locomo_chip_driver(dev);
+
+	if (vr)
+		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
+	else
+		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	udelay(100);
+	locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+	locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_frontlight_set);
+
+/*
+ *	LoCoMo "Register Access Bus."
+ *
+ *	We model this as a regular bus type, and hang devices directly
+ *	off this.
+ */
+static int locomo_match(struct device *_dev, struct device_driver *_drv)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+	struct locomo_driver *drv = LOCOMO_DRV(_drv);
+
+	return dev->devid == drv->devid;
+}
+
+static int locomo_bus_probe(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = -ENODEV;
+
+	if (drv->probe)
+		ret = drv->probe(ldev);
+	return ret;
+}
+
+static int locomo_bus_remove(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv->remove)
+		ret = drv->remove(ldev);
+	return ret;
+}
+
+struct bus_type locomo_bus_type = {
+	.name		= "locomo-bus",
+	.match		= locomo_match,
+	.probe		= locomo_bus_probe,
+	.remove		= locomo_bus_remove,
+};
+
+int locomo_driver_register(struct locomo_driver *driver)
+{
+	driver->drv.bus = &locomo_bus_type;
+	return driver_register(&driver->drv);
+}
+EXPORT_SYMBOL(locomo_driver_register);
+
+void locomo_driver_unregister(struct locomo_driver *driver)
+{
+	driver_unregister(&driver->drv);
+}
+EXPORT_SYMBOL(locomo_driver_unregister);
+
+static int __init locomo_init(void)
+{
+	int ret = bus_register(&locomo_bus_type);
+	if (ret == 0)
+		platform_driver_register(&locomo_device_driver);
+	return ret;
+}
+
+static void __exit locomo_exit(void)
+{
+	platform_driver_unregister(&locomo_device_driver);
+	bus_unregister(&locomo_bus_type);
+}
+
+module_init(locomo_init);
+module_exit(locomo_exit);
+
+MODULE_DESCRIPTION("Sharp LoCoMo core driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");