+++ /dev/null
-/*
- * 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/clk.h>
-#include <linux/err.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 = 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");
projects / openwrt / svn-archive / archive.git / blobdiff