From 7a88b927f855ff18a7f02bcdf5589905d2d6be37 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Mon, 21 Sep 2009 23:18:21 +0200 Subject: [PATCH] Add jz4740 ADC driver. --- .../files-2.6.31/drivers/misc/jz4740-adc.c | 362 ++++++++++++++++++ .../linux/xburst/patches-2.6.31/053-adc.patch | 29 ++ 2 files changed, 391 insertions(+) create mode 100644 target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c create mode 100644 target/linux/xburst/patches-2.6.31/053-adc.patch diff --git a/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c b/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c new file mode 100644 index 000000000..eb034055a --- /dev/null +++ b/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c @@ -0,0 +1,362 @@ +/* + * Copyright (C) 2009, Lars-Peter Clausen + * 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 +#include +#include +#include +#include +#include + +#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 "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:jz4740-adc"); +MODULE_ALIAS("platform:jz4720-adc"); diff --git a/target/linux/xburst/patches-2.6.31/053-adc.patch b/target/linux/xburst/patches-2.6.31/053-adc.patch new file mode 100644 index 000000000..ec77dafa3 --- /dev/null +++ b/target/linux/xburst/patches-2.6.31/053-adc.patch @@ -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/