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Add jz4740 ADC driver.

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This commit is contained in:
Lars-Peter Clausen 2009-09-21 23:18:21 +02:00 committed by Xiangfu Liu
parent 7c9aa25b12
commit 7a88b927f8
2 changed files with 391 additions and 0 deletions
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362
target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c Normal file
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@ -0,0 +1,362 @@
/*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/interrupt.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 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);
}
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;
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);
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_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);
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;
}
init_completion(&adc->bat_completion);
init_completion(&adc->adc_completion);
spin_lock_init(&adc->lock);
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_iounmap;
}
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_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));
platform_set_drvdata(pdev, NULL);
kfree(adc);
return 0;
}
struct platform_driver jz4740_adc_driver = {
.probe = jz4740_adc_probe,
.remove = 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");

29
target/linux/xburst/patches-2.6.31/053-adc.patch Normal file
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@ -0,0 +1,29 @@
--- a/drivers/misc/Kconfig 2009-09-02 16:48:02.000000000 +0200
+++ b/drivers/misc/Kconfig 2009-09-21 22:06:56.000000000 +0200
@@ -233,6 +233,17 @@
This driver can also be built as a module. If so, the module
will be called isl29003.
+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"
--- a/linux-2.6/drivers/misc/Makefile 2009-09-02 16:48:02.000000000 +0200
+++ b/drivers/misc/Makefile 2009-09-21 16:47:41.000000000 +0200
@@ -20,5 +20,6 @@
obj-$(CONFIG_HP_ILO) += hpilo.o
obj-$(CONFIG_ISL29003) += isl29003.o
obj-$(CONFIG_C2PORT) += c2port/
+obj-$(CONFIG_JZ4740_ADC) += jz4740-adc.o
obj-y += eeprom/
obj-y += cb710/