drivers/iio/adc/rockchip_saradc.c

Source file repositories/reference/linux-study-clean/drivers/iio/adc/rockchip_saradc.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/adc/rockchip_saradc.c
Extension
.c
Size
16764 bytes
Lines
627
Domain
Driver Families
Bucket
drivers/iio
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rockchip_saradc_data {
	const struct iio_chan_spec	*channels;
	int				num_channels;
	unsigned long			clk_rate;
	void (*start)(struct rockchip_saradc *info, int chn);
	int (*read)(struct rockchip_saradc *info);
	void (*power_down)(struct rockchip_saradc *info);
};

struct rockchip_saradc {
	void __iomem		*regs;
	struct clk		*pclk;
	struct clk		*clk;
	struct completion	completion;
	struct regulator	*vref;
	/* lock to protect against multiple access to the device */
	struct mutex		lock;
	int			uv_vref;
	struct reset_control	*reset;
	const struct rockchip_saradc_data *data;
	u16			last_val;
	const struct iio_chan_spec *last_chan;
	struct notifier_block nb;
};

static void rockchip_saradc_reset_controller(struct reset_control *reset);

static void rockchip_saradc_start_v1(struct rockchip_saradc *info, int chn)
{
	/* 8 clock periods as delay between power up and start cmd */
	writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC);
	/* Select the channel to be used and trigger conversion */
	writel(SARADC_CTRL_POWER_CTRL | (chn & SARADC_CTRL_CHN_MASK) |
	       SARADC_CTRL_IRQ_ENABLE, info->regs + SARADC_CTRL);
}

static void rockchip_saradc_start_v2(struct rockchip_saradc *info, int chn)
{
	int val;

	if (info->reset)
		rockchip_saradc_reset_controller(info->reset);

	writel_relaxed(0xc, info->regs + SARADC_T_DAS_SOC);
	writel_relaxed(0x20, info->regs + SARADC_T_PD_SOC);
	val = FIELD_PREP(SARADC2_EN_END_INT, 1);
	val |= SARADC2_EN_END_INT << 16;
	writel_relaxed(val, info->regs + SARADC2_END_INT_EN);
	val = FIELD_PREP(SARADC2_START, 1) |
	      FIELD_PREP(SARADC2_SINGLE_MODE, 1) |
	      FIELD_PREP(SARADC2_CONV_CHANNELS, chn);
	val |= (SARADC2_START | SARADC2_SINGLE_MODE | SARADC2_CONV_CHANNELS) << 16;
	writel(val, info->regs + SARADC2_CONV_CON);
}

static void rockchip_saradc_start(struct rockchip_saradc *info, int chn)
{
	info->data->start(info, chn);
}

static int rockchip_saradc_read_v1(struct rockchip_saradc *info)
{
	return readl_relaxed(info->regs + SARADC_DATA);
}

static int rockchip_saradc_read_v2(struct rockchip_saradc *info)
{
	int offset;

	/* Clear irq */
	writel_relaxed(0x1, info->regs + SARADC2_END_INT_ST);

	offset = SARADC2_DATA_BASE + info->last_chan->channel * 0x4;

	return readl_relaxed(info->regs + offset);
}

static int rockchip_saradc_read(struct rockchip_saradc *info)
{
	return info->data->read(info);
}

static void rockchip_saradc_power_down_v1(struct rockchip_saradc *info)
{
	writel_relaxed(0, info->regs + SARADC_CTRL);
}

static void rockchip_saradc_power_down(struct rockchip_saradc *info)
{
	if (info->data->power_down)

Annotation

Implementation Notes