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-rw-r--r--target/linux/xburst/patches-2.6.34/053-adc.patch498
1 files changed, 498 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.34/053-adc.patch b/target/linux/xburst/patches-2.6.34/053-adc.patch
new file mode 100644
index 0000000..80f7f46
--- /dev/null
+++ b/target/linux/xburst/patches-2.6.34/053-adc.patch
@@ -0,0 +1,498 @@
+From 0ba56db361ac905ff2e2d4e6288206c73e3df523 Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Sat, 24 Apr 2010 12:18:01 +0200
+Subject: [PATCH] Add jz4740 adc driver
+
+---
+ drivers/misc/Kconfig | 11 ++
+ drivers/misc/Makefile | 1 +
+ drivers/misc/jz4740-adc.c | 410 ++++++++++++++++++++++++++++++++++++++++++++
+ include/linux/jz4740-adc.h | 25 +++
+ 4 files changed, 447 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/misc/jz4740-adc.c
+ create mode 100644 include/linux/jz4740-adc.h
+
+diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
+index 0d0d625..c62f615 100644
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -327,6 +327,17 @@ config VMWARE_BALLOON
+ To compile this driver as a module, choose M here: the
+ module will be called vmware_balloon.
+
++config JZ4740_ADC
++ tristate "Ingenic JZ4720/JZ4740 SoC ADC driver"
++ depends on SOC_JZ4740
++ help
++ If you say yes here you get support for the Ingenic JZ4720/JZ4740 SoC ADC
++ core. It is required for the JZ4720/JZ4740 battery and touchscreen driver
++ and is used to synchronize access to the adc core between those two.
++
++ This driver can also be build as a module. If so, the module will be
++ called jz4740-adc.
++
+ source "drivers/misc/c2port/Kconfig"
+ source "drivers/misc/eeprom/Kconfig"
+ source "drivers/misc/cb710/Kconfig"
+diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
+index 7b6f7ee..506bcf6 100644
+--- a/drivers/misc/Makefile
++++ b/drivers/misc/Makefile
+@@ -27,6 +27,7 @@ obj-$(CONFIG_DS1682) += ds1682.o
+ obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
+ obj-$(CONFIG_C2PORT) += c2port/
+ obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
++obj-$(CONFIG_JZ4740_ADC) += jz4740-adc.o
+ obj-y += eeprom/
+ obj-y += cb710/
+ obj-$(CONFIG_VMWARE_BALLOON) += vmware_balloon.o
+diff --git a/drivers/misc/jz4740-adc.c b/drivers/misc/jz4740-adc.c
+new file mode 100644
+index 0000000..a8a735a
+--- /dev/null
++++ b/drivers/misc/jz4740-adc.c
+@@ -0,0 +1,410 @@
++/*
++ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
++ * JZ4720/JZ4740 SoC ADC driver
++ *
++ * 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.
++ *
++ * You should have received a copy of the GNU General Public License along
++ * with this program; if not, write to the Free Software Foundation, Inc.,
++ * 675 Mass Ave, Cambridge, MA 02139, USA.
++ *
++ * This driver is meant to synchronize access to the adc core for the battery
++ * and touchscreen driver. Thus these drivers should use the adc driver as a
++ * parent.
++ */
++
++#include <linux/err.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++#include <linux/spinlock.h>
++#include <linux/interrupt.h>
++
++#include <linux/clk.h>
++
++#include <linux/jz4740-adc.h>
++
++#define JZ_REG_ADC_ENABLE 0x00
++#define JZ_REG_ADC_CFG 0x04
++#define JZ_REG_ADC_CTRL 0x08
++#define JZ_REG_ADC_STATUS 0x0C
++#define JZ_REG_ADC_SAME 0x10
++#define JZ_REG_ADC_WAIT 0x14
++#define JZ_REG_ADC_TOUCH 0x18
++#define JZ_REG_ADC_BATTERY 0x1C
++#define JZ_REG_ADC_ADCIN 0x20
++
++#define JZ_ADC_ENABLE_TOUCH BIT(2)
++#define JZ_ADC_ENABLE_BATTERY BIT(1)
++#define JZ_ADC_ENABLE_ADCIN BIT(0)
++
++#define JZ_ADC_CFG_SPZZ BIT(31)
++#define JZ_ADC_CFG_EX_IN BIT(30)
++#define JZ_ADC_CFG_DNUM_MASK (0x7 << 16)
++#define JZ_ADC_CFG_DMA_ENABLE BIT(15)
++#define JZ_ADC_CFG_XYZ_MASK (0x2 << 13)
++#define JZ_ADC_CFG_SAMPLE_NUM_MASK (0x7 << 10)
++#define JZ_ADC_CFG_CLKDIV (0xf << 5)
++#define JZ_ADC_CFG_BAT_MB BIT(4)
++
++#define JZ_ADC_CFG_DNUM_OFFSET 16
++#define JZ_ADC_CFG_XYZ_OFFSET 13
++#define JZ_ADC_CFG_SAMPLE_NUM_OFFSET 10
++#define JZ_ADC_CFG_CLKDIV_OFFSET 5
++
++#define JZ_ADC_IRQ_PENDOWN BIT(4)
++#define JZ_ADC_IRQ_PENUP BIT(3)
++#define JZ_ADC_IRQ_TOUCH BIT(2)
++#define JZ_ADC_IRQ_BATTERY BIT(1)
++#define JZ_ADC_IRQ_ADCIN BIT(0)
++
++#define JZ_ADC_TOUCH_TYPE1 BIT(31)
++#define JZ_ADC_TOUCH_DATA1_MASK 0xfff
++#define JZ_ADC_TOUCH_TYPE0 BIT(15)
++#define JZ_ADC_TOUCH_DATA0_MASK 0xfff
++
++#define JZ_ADC_BATTERY_MASK 0xfff
++
++#define JZ_ADC_ADCIN_MASK 0xfff
++
++struct jz4740_adc {
++ struct resource *mem;
++ void __iomem *base;
++
++ int irq;
++
++ struct clk *clk;
++ unsigned int clk_ref;
++
++ struct completion bat_completion;
++ struct completion adc_completion;
++
++ spinlock_t lock;
++};
++
++static irqreturn_t jz4740_adc_irq(int irq, void *data)
++{
++ struct jz4740_adc *adc = data;
++ uint8_t status;
++
++ status = readb(adc->base + JZ_REG_ADC_STATUS);
++
++ if (status & JZ_ADC_IRQ_BATTERY)
++ complete(&adc->bat_completion);
++ if (status & JZ_ADC_IRQ_ADCIN)
++ complete(&adc->adc_completion);
++
++ writeb(0xff, adc->base + JZ_REG_ADC_STATUS);
++
++ return IRQ_HANDLED;
++}
++
++static void jz4740_adc_enable_irq(struct jz4740_adc *adc, int irq)
++{
++ unsigned long flags;
++ uint8_t val;
++
++ spin_lock_irqsave(&adc->lock, flags);
++
++ val = readb(adc->base + JZ_REG_ADC_CTRL);
++ val &= ~irq;
++ writeb(val, adc->base + JZ_REG_ADC_CTRL);
++
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static void jz4740_adc_disable_irq(struct jz4740_adc *adc, int irq)
++{
++ unsigned long flags;
++ uint8_t val;
++
++ spin_lock_irqsave(&adc->lock, flags);
++
++ val = readb(adc->base + JZ_REG_ADC_CTRL);
++ val |= irq;
++ writeb(val, adc->base + JZ_REG_ADC_CTRL);
++
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static void jz4740_adc_enable_adc(struct jz4740_adc *adc, int engine)
++{
++ unsigned long flags;
++ uint8_t val;
++
++ spin_lock_irqsave(&adc->lock, flags);
++
++ val = readb(adc->base + JZ_REG_ADC_ENABLE);
++ val |= engine;
++ writeb(val, adc->base + JZ_REG_ADC_ENABLE);
++
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static void jz4740_adc_disable_adc(struct jz4740_adc *adc, int engine)
++{
++ unsigned long flags;
++ uint8_t val;
++
++ spin_lock_irqsave(&adc->lock, flags);
++
++ val = readb(adc->base + JZ_REG_ADC_ENABLE);
++ val &= ~engine;
++ writeb(val, adc->base + JZ_REG_ADC_ENABLE);
++
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static inline void jz4740_adc_set_cfg(struct jz4740_adc *adc, uint32_t mask,
++uint32_t val)
++{
++ unsigned long flags;
++ uint32_t cfg;
++
++ spin_lock_irqsave(&adc->lock, flags);
++
++ cfg = readl(adc->base + JZ_REG_ADC_CFG);
++
++ cfg &= ~mask;
++ cfg |= val;
++
++ writel(cfg, adc->base + JZ_REG_ADC_CFG);
++
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
++{
++ unsigned long flags;
++
++ spin_lock_irqsave(&adc->lock, flags);
++ if (adc->clk_ref++ == 0)
++ clk_enable(adc->clk);
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
++{
++ unsigned long flags;
++
++ spin_lock_irqsave(&adc->lock, flags);
++ if (--adc->clk_ref == 0)
++ clk_disable(adc->clk);
++ spin_unlock_irqrestore(&adc->lock, flags);
++}
++
++long jz4740_adc_read_battery_voltage(struct device *dev,
++ enum jz_adc_battery_scale scale)
++{
++ struct jz4740_adc *adc = dev_get_drvdata(dev);
++ unsigned long t;
++ long long voltage;
++ uint16_t val;
++
++ if (!adc)
++ return -ENODEV;
++
++ jz4740_adc_clk_enable(adc);
++
++ if (scale == JZ_ADC_BATTERY_SCALE_2V5)
++ jz4740_adc_set_cfg(adc, JZ_ADC_CFG_BAT_MB, JZ_ADC_CFG_BAT_MB);
++ else
++ jz4740_adc_set_cfg(adc, JZ_ADC_CFG_BAT_MB, 0);
++
++ jz4740_adc_enable_irq(adc, JZ_ADC_IRQ_BATTERY);
++ jz4740_adc_enable_adc(adc, JZ_ADC_ENABLE_BATTERY);
++
++ t = wait_for_completion_interruptible_timeout(&adc->bat_completion,
++ HZ);
++
++ jz4740_adc_disable_irq(adc, JZ_ADC_IRQ_BATTERY);
++
++ if (t <= 0) {
++ jz4740_adc_disable_adc(adc, JZ_ADC_ENABLE_BATTERY);
++ return t ? t : -ETIMEDOUT;
++ }
++
++ val = readw(adc->base + JZ_REG_ADC_BATTERY);
++
++ jz4740_adc_clk_disable(adc);
++
++ if (scale == JZ_ADC_BATTERY_SCALE_2V5)
++ voltage = (((long long)val) * 2500000LL) >> 12LL;
++ else
++ voltage = ((((long long)val) * 7395000LL) >> 12LL) + 33000LL;
++
++ return voltage;
++}
++EXPORT_SYMBOL_GPL(jz4740_adc_read_battery_voltage);
++
++static ssize_t jz4740_adc_read_adcin(struct device *dev,
++ struct device_attribute *dev_attr,
++ char *buf)
++{
++ struct jz4740_adc *adc = dev_get_drvdata(dev);
++ unsigned long t;
++ uint16_t val;
++
++ jz4740_adc_clk_enable(adc);
++
++ jz4740_adc_enable_irq(adc, JZ_ADC_IRQ_ADCIN);
++ jz4740_adc_enable_adc(adc, JZ_ADC_ENABLE_ADCIN);
++
++ t = wait_for_completion_interruptible_timeout(&adc->adc_completion,
++ HZ);
++
++ jz4740_adc_disable_irq(adc, JZ_ADC_IRQ_ADCIN);
++
++ if (t <= 0) {
++ jz4740_adc_disable_adc(adc, JZ_ADC_ENABLE_ADCIN);
++ return t ? t : -ETIMEDOUT;
++ }
++
++ val = readw(adc->base + JZ_REG_ADC_ADCIN);
++ jz4740_adc_clk_disable(adc);
++
++ return sprintf(buf, "%d\n", val);
++}
++
++static DEVICE_ATTR(adcin, S_IRUGO, jz4740_adc_read_adcin, NULL);
++
++static int __devinit jz4740_adc_probe(struct platform_device *pdev)
++{
++ int ret;
++ struct jz4740_adc *adc;
++
++ adc = kmalloc(sizeof(*adc), GFP_KERNEL);
++
++ adc->irq = platform_get_irq(pdev, 0);
++
++ if (adc->irq < 0) {
++ ret = adc->irq;
++ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
++ goto err_free;
++ }
++
++ adc->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++
++ if (!adc->mem) {
++ ret = -ENOENT;
++ dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
++ goto err_free;
++ }
++
++ adc->mem = request_mem_region(adc->mem->start, resource_size(adc->mem),
++ pdev->name);
++
++ if (!adc->mem) {
++ ret = -EBUSY;
++ dev_err(&pdev->dev, "Failed to request mmio memory region\n");
++ goto err_free;
++ }
++
++ adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
++
++ if (!adc->base) {
++ ret = -EBUSY;
++ dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
++ goto err_release_mem_region;
++ }
++
++ adc->clk = clk_get(&pdev->dev, "adc");
++
++ if (IS_ERR(adc->clk)) {
++ ret = PTR_ERR(adc->clk);
++ dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
++ goto err_iounmap;
++ }
++
++ init_completion(&adc->bat_completion);
++ init_completion(&adc->adc_completion);
++
++ spin_lock_init(&adc->lock);
++
++ adc->clk_ref = 0;
++
++ platform_set_drvdata(pdev, adc);
++
++ ret = request_irq(adc->irq, jz4740_adc_irq, 0, pdev->name, adc);
++
++ if (ret) {
++ dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
++ goto err_clk_put;
++ }
++
++ ret = device_create_file(&pdev->dev, &dev_attr_adcin);
++ if (ret) {
++ dev_err(&pdev->dev, "Failed to create sysfs file: %d\n", ret);
++ goto err_free_irq;
++ }
++
++ writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
++ writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
++
++ return 0;
++
++err_free_irq:
++ free_irq(adc->irq, adc);
++err_clk_put:
++ clk_put(adc->clk);
++err_iounmap:
++ platform_set_drvdata(pdev, NULL);
++ iounmap(adc->base);
++err_release_mem_region:
++ release_mem_region(adc->mem->start, resource_size(adc->mem));
++err_free:
++ kfree(adc);
++
++ return ret;
++}
++
++static int __devexit jz4740_adc_remove(struct platform_device *pdev)
++{
++ struct jz4740_adc *adc = platform_get_drvdata(pdev);
++
++ device_remove_file(&pdev->dev, &dev_attr_adcin);
++
++ free_irq(adc->irq, adc);
++
++ iounmap(adc->base);
++ release_mem_region(adc->mem->start, resource_size(adc->mem));
++
++ clk_put(adc->clk);
++
++ platform_set_drvdata(pdev, NULL);
++
++ kfree(adc);
++
++ return 0;
++}
++
++struct platform_driver jz4740_adc_driver = {
++ .probe = jz4740_adc_probe,
++ .remove = __devexit_p(jz4740_adc_remove),
++ .driver = {
++ .name = "jz4740-adc",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init jz4740_adc_init(void)
++{
++ return platform_driver_register(&jz4740_adc_driver);
++}
++module_init(jz4740_adc_init);
++
++static void __exit jz4740_adc_exit(void)
++{
++ platform_driver_unregister(&jz4740_adc_driver);
++}
++module_exit(jz4740_adc_exit);
++
++MODULE_DESCRIPTION("JZ4720/JZ4740 SoC ADC driver");
++MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS("platform:jz4740-adc");
++MODULE_ALIAS("platform:jz4720-adc");
+diff --git a/include/linux/jz4740-adc.h b/include/linux/jz4740-adc.h
+new file mode 100644
+index 0000000..59cfe63
+--- /dev/null
++++ b/include/linux/jz4740-adc.h
+@@ -0,0 +1,25 @@
++
++#ifndef __LINUX_JZ4740_ADC
++#define __LINUX_JZ4740_ADC
++
++#include <linux/device.h>
++
++enum jz_adc_battery_scale {
++ JZ_ADC_BATTERY_SCALE_2V5, /* Mesures voltages up to 2.5V */
++ JZ_ADC_BATTERY_SCALE_7V5, /* Mesures voltages up to 7.5V */
++};
++
++/*
++ * jz4740_adc_read_battery_voltage - Read battery voltage from the ADC PBAT pin
++ * @dev: Pointer to a jz4740-adc device
++ * @scale: Whether to use 2.5V or 7.5V scale
++ *
++ * Returns: Battery voltage in mircovolts
++ *
++ * Context: Process
++*/
++long jz4740_adc_read_battery_voltage(struct device *dev,
++ enum jz_adc_battery_scale scale);
++
++
++#endif
+--
+1.5.6.5
+
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