mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-06 10:58:48 +09:00
saradc filename changed: rk_adc.c => rockchip_adc.c
This commit is contained in:
wdc
@@ -453,7 +453,7 @@ CONFIG_SYNC=y
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CONFIG_ION=y
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CONFIG_ION_ROCKCHIP=y
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CONFIG_IIO=y
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CONFIG_RK_ADC=y
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CONFIG_ROCKCHIP_ADC=y
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CONFIG_PWM=y
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CONFIG_PWM_ROCKCHIP=y
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CONFIG_EXT2_FS=y
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@@ -157,7 +157,7 @@ config VIPERBOARD_ADC
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Say yes here to access the ADC part of the Nano River
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Technologies Viperboard.
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config RK_ADC
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config ROCKCHIP_ADC
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tristate "Rockchip ADC support"
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depends on OF
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help
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@@ -17,4 +17,4 @@ obj-$(CONFIG_MAX1363) += max1363.o
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obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
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obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
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obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
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obj-$(CONFIG_RK_ADC) += rk_adc.o
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obj-$(CONFIG_ROCKCHIP_ADC) += rockchip_adc.o
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360
drivers/iio/adc/rockchip_adc.c
Executable file
360
drivers/iio/adc/rockchip_adc.c
Executable file
@@ -0,0 +1,360 @@
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/*
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* rk_adc.c - Support for ADC in rockchip SoCs
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*
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* 3channel, 10-bit ADC
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/regulator/consumer.h>
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#include <linux/of_platform.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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#if 0
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#define RK_ADC_DBG(x...) \
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printk(KERN_INFO"[rk_adc]: "x)
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#else
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#define RK_ADC_DBG(x...)
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#endif
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enum host_chn_shift{
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SARADC_CHN_SHIFT = 0,
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CUSTOM_CHN_SHIFT = 28
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};
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enum host_chn_mask{
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SARADC_CHN_MASK = 0x0000000f, // saradc: 0 -- 15
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CUSTOM_CHN_MASK = 0xf0000000,
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};
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#define ADC_DATA 0x00
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#define ADC_DATA_MASK 0x3ff
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#define ADC_STAS 0x04
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#define ADC_STAS_BUSY (1<<0)
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#define ADC_CTRL 0x08
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#define ADC_DELAY_PU_SOC 0x0c
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#define ADC_CTRL_CH(ch) (ch >> SARADC_CHN_SHIFT) //(0x07 - ((ch)<<0))
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#define ADC_CTRL_POWER_UP (1<<3)
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#define ADC_CTRL_IRQ_ENABLE (1<<5)
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#define ADC_CTRL_IRQ_STATUS (1<<6)
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#define ADC_CLK_RATE 1 //1M
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#define SAMPLE_RATE (20/ADC_CLK_RATE) //20 CLK
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#define MAX_RK_ADC_CHANNELS 3
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#define RK_ADC_TIMEOUT (msecs_to_jiffies(100))
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struct rk_adc {
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void __iomem *regs;
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struct clk *pclk;
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struct clk *clk;
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struct completion completion;
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unsigned int irq;
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u32 vref_mv;
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u32 num_channels;
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u32 value;
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};
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static const struct of_device_id rk_adc_match[] = {
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{ .compatible = "rockchip,saradc", .data = NULL},
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{},
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};
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MODULE_DEVICE_TABLE(of, rk_adc_match);
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static int rk_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long mask)
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{
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struct rk_adc *info = iio_priv(indio_dev);
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unsigned long timeout;
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if (mask != IIO_CHAN_INFO_RAW)
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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/* Select the channel to be used and Trigger conversion */
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//adc_writel(0, dev->regs + ADC_CTRL);
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writel_relaxed(0x08, info->regs + ADC_DELAY_PU_SOC);
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writel_relaxed(ADC_CTRL_POWER_UP|ADC_CTRL_CH(chan->channel)|ADC_CTRL_IRQ_ENABLE, info->regs + ADC_CTRL);
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timeout = wait_for_completion_timeout
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(&info->completion, RK_ADC_TIMEOUT);
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*val = info->value;
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mutex_unlock(&indio_dev->mlock);
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RK_ADC_DBG("read adc value: %d form channel: %d\n", *val, chan->channel);
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if (timeout == 0)
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return -ETIMEDOUT;
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return IIO_VAL_INT;
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}
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static irqreturn_t rk_adc_isr(int irq, void *dev_id)
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{
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struct rk_adc *info = (struct rk_adc *)dev_id;
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/* Read value */
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info->value = readl_relaxed(info->regs + ADC_DATA) & ADC_DATA_MASK;
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/* clear irq & power down adc*/
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writel_relaxed(0, info->regs + ADC_CTRL);
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complete(&info->completion);
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return IRQ_HANDLED;
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}
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static int rk_adc_reg_access(struct iio_dev *indio_dev,
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unsigned reg, unsigned writeval,
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unsigned *readval)
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{
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struct rk_adc *info = iio_priv(indio_dev);
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if (readval == NULL)
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return -EINVAL;
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*readval = readl_relaxed(info->regs + reg);
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return 0;
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}
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static const struct iio_info rk_adc_iio_info = {
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.read_raw = &rk_read_raw,
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.debugfs_reg_access = &rk_adc_reg_access,
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.driver_module = THIS_MODULE,
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};
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#define ADC_CHANNEL(_index, _id) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = _index, \
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.address = _index, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.datasheet_name = _id, \
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}
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static const struct iio_chan_spec rk_adc_iio_channels[] = {
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ADC_CHANNEL(0, "adc0"),
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ADC_CHANNEL(1, "adc1"),
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ADC_CHANNEL(2, "adc2"),
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};
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static int rk_adc_remove_devices(struct device *dev, void *c)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int rk_adc_probe(struct platform_device *pdev)
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{
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struct rk_adc *info = NULL;
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struct device_node *np = pdev->dev.of_node;
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struct iio_dev *indio_dev = NULL;
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struct resource *mem;
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int ret = -ENODEV;
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int irq;
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u32 rate;
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if (!np)
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return ret;
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indio_dev = iio_device_alloc(sizeof(struct rk_adc));
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if (!indio_dev) {
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dev_err(&pdev->dev, "failed allocating iio device\n");
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return -ENOMEM;
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}
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info = iio_priv(indio_dev);
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//resource ioremap
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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info->regs = devm_request_and_ioremap(&pdev->dev, mem);
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if (!info->regs) {
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ret = -ENOMEM;
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goto err_iio;
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}
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//irq request
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "no irq resource?\n");
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ret = irq;
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goto err_iio;
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}
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info->irq = irq;
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init_completion(&info->completion);
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ret = devm_request_irq(&pdev->dev, info->irq, rk_adc_isr,
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0, dev_name(&pdev->dev), info);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
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info->irq);
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goto err_iio;
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}
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//clk enable
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info->pclk = clk_get(&pdev->dev, "pclk_saradc");
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if (IS_ERR(info->pclk)) {
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dev_err(&pdev->dev, "failed to get adc pclk\n");
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ret = PTR_ERR(info->pclk);
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goto err_iio;
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}
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clk_prepare_enable(info->pclk);
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info->clk = clk_get(&pdev->dev, "saradc");
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if (IS_ERR(info->clk)) {
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dev_err(&pdev->dev, "failed to get adc clock\n");
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ret = PTR_ERR(info->clk);
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goto err_pclk;
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}
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if(of_property_read_u32(np, "clock-frequency", &rate)) {
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dev_err(&pdev->dev, "Missing clock-frequency property in the DT.\n");
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goto err_clk2;
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}
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ret = clk_set_rate(info->clk, rate);
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if(ret < 0) {
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dev_err(&pdev->dev, "failed to set adc clk\n");
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goto err_clk2;
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}
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clk_prepare_enable(info->clk);
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//device register
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indio_dev->name = dev_name(&pdev->dev);
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indio_dev->dev.parent = &pdev->dev;
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indio_dev->dev.of_node = pdev->dev.of_node;
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indio_dev->info = &rk_adc_iio_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = rk_adc_iio_channels;
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if (of_property_read_u32(np, "rockchip,adc-vref", &info->vref_mv)) {
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dev_err(&pdev->dev, "Missing rockchip,adc-vref property in the DT.\n");
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goto err_clk;
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}
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indio_dev->num_channels = sizeof(rk_adc_iio_channels)/sizeof(struct iio_chan_spec);
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ret = iio_device_register(indio_dev);
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if (ret)
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goto err_iio_dev;
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platform_set_drvdata(pdev, indio_dev);
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ret = of_platform_populate(np, rk_adc_match, NULL, &pdev->dev);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed adding child nodes\n");
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goto err_of_populate;
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}
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return 0;
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err_of_populate:
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device_for_each_child(&pdev->dev, NULL,
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rk_adc_remove_devices);
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err_iio_dev:
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iio_device_unregister(indio_dev);
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err_clk:
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clk_disable(info->clk);
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err_clk2:
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clk_put(info->clk);
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err_pclk:
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clk_disable(info->pclk);
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clk_put(info->pclk);
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err_iio:
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iio_device_free(indio_dev);
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return ret;
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}
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static int rk_adc_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct rk_adc *info = iio_priv(indio_dev);
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device_for_each_child(&pdev->dev, NULL,
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rk_adc_remove_devices);
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clk_disable(info->clk);
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clk_put(info->clk);
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clk_disable(info->pclk);
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clk_put(info->pclk);
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iio_device_unregister(indio_dev);
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free_irq(info->irq, info);
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iio_device_free(indio_dev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int rk_adc_suspend(struct device *dev)
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{
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//struct iio_dev *indio_dev = dev_get_drvdata(dev);
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//struct exynos_adc *info = iio_priv(indio_dev);
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int ret = 0;
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return ret;
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}
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static int rk_adc_resume(struct device *dev)
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{
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//struct iio_dev *indio_dev = dev_get_drvdata(dev);
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//struct rk_adc *info = iio_priv(indio_dev);
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int ret = 0;
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return ret;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(rk_adc_pm_ops,
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rk_adc_suspend,
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rk_adc_resume);
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static struct platform_driver rk_adc_driver = {
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.probe = rk_adc_probe,
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.remove = rk_adc_remove,
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.driver = {
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.name = "rockchip-adc",
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.owner = THIS_MODULE,
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.of_match_table = rk_adc_match,
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.pm = &rk_adc_pm_ops,
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},
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};
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module_platform_driver(rk_adc_driver);
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