diff --git a/Documentation/devicetree/bindings/iio/adc/phytium,adc.yaml b/Documentation/devicetree/bindings/iio/adc/phytium,adc.yaml new file mode 100644 index 0000000000000..cfbf6554a1059 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/phytium,adc.yaml @@ -0,0 +1,81 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2019 Analog Devices Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/phytium,adi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Phytium ADC + +maintainers: + - Chen Baozi + +description: | + This device is a 10-bit converter for 8 voltage channels. All inputs are + single ended. + +properties: + compatible: + const: phytium,adc + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + description: Input clock used to derive the sample clock. + + interrupts: + maxItems: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + +required: + - compatible + - reg + - clocks + - interrupts + - '#address-cells' + - '#size-cells' + +examples: + - | + adc0: adc@2807b000 { + compatible = "phytium,adc"; + reg = <0x0 0x2807b000 0x0 0x1000>; + interrupts = ; + clocks = <&sysclk_48mhz>; + + #address-cells = <1>; + #size-cells = <0>; + + channel@0 { + reg = <0>; + }; + channel@1 { + reg = <1>; + }; + channel@2 { + reg = <2>; + }; + channel@3 { + reg = <3>; + }; + channel@4 { + reg = <4>; + }; + channel@5 { + reg = <5>; + }; + channel@6 { + reg = <5>; + }; + channel@7 { + reg = <7>; + }; + }; diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 3b73c509bd68e..144b4aac45ba6 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -938,6 +938,18 @@ config PALMAS_GPADC is used in smartphones and tablets and supports a 16 channel general purpose ADC. +config PHYTIUM_ADC + tristate "Phytium ADC driver" + depends on ARCH_PHYTIUM || COMPILE_TEST + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say yes here to build support for Phytium analog to digital + converters (ADC). + + To compile this driver as a module, choose M here: the module + will be called phytium-adc. + config QCOM_VADC_COMMON tristate diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index d2fda54a3259c..b07137a0ce629 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o obj-$(CONFIG_NAU7802) += nau7802.o obj-$(CONFIG_NPCM_ADC) += npcm_adc.o obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o +obj-$(CONFIG_PHYTIUM_ADC) += phytium-adc.o obj-$(CONFIG_QCOM_SPMI_ADC5) += qcom-spmi-adc5.o obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o obj-$(CONFIG_QCOM_SPMI_RRADC) += qcom-spmi-rradc.o diff --git a/drivers/iio/adc/phytium-adc.c b/drivers/iio/adc/phytium-adc.c new file mode 100644 index 0000000000000..c62ee2cda9264 --- /dev/null +++ b/drivers/iio/adc/phytium-adc.c @@ -0,0 +1,688 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Phytium ADC device driver + * + * Copyright (C) 2021-2023, Phytium Technology Co., Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +/* ADC register */ +#define ADC_CTRL_REG 0x00 +#define ADC_CTRL_REG_PD_EN BIT(31) +#define ADC_CTRL_REG_CH_ONLY_S(x) ((x & 0x7) << 16) +#define ADC_CTRL_REG_CLK_DIV(x) ((x) << 12) +#define ADC_CTRL_REG_CHANNEL_EN(x) BIT((x) + 4) +#define ADC_CTRL_REG_CH_ONLY_EN BIT(3) +#define ADC_CTRL_REG_SINGLE_EN BIT(2) +#define ADC_CTRL_REG_SINGLE_SEL BIT(1) +#define ADC_CTRL_REG_SOC_EN BIT(0) +#define ADC_INTER_REG 0x04 +#define ADC_STATE_REG 0x08 +#define ADC_STATE_REG_B_STA(x) ((x) << 8) +#define ADC_STATE_REG_EOC_STA BIT(7) +#define ADC_STATE_REG_S_STA(x) ((x) << 4) +#define ADC_STATE_REG_SOC_STA BIT(3) +#define ADC_STATE_REG_ERR_STA BIT(2) +#define ADC_STATE_REG_COV_FINISH_STA BIT(1) +#define ADC_STATE_REG_ADCCTL_BUSY_STA BIT(0) +#define ADC_ERRCLR_REG 0x0c +#define ADC_LEVEL_REG(x) (0x10 + ((x) << 2)) +#define ADC_LEVEL_REG_HIGH_LEVEL(x) ((x) << 16) +#define ADC_LEVEL_REG_LOW_LEVEL(x) (x) +#define ADC_INTRMASK_REG 0x30 +#define ADC_INTRMASK_REG_ERR_INTR_MASK BIT(24) +#define ADC_INTRMASK_REG_ULIMIT_OFF(x) BIT(9 + ((x) << 1)) +#define ADC_INTRMASK_REG_DLIMIT_MASK(x) BIT(8 + ((x) << 1)) +#define ADC_INTRMASK_REG_COVFIN_MASK(x) BIT((x)) +#define ADC_INTR_REG 0x34 +#define ADC_INTR_REG_ERR BIT(24) +#define ADC_INTR_REG_ULIMIT(x) BIT(9 + ((x) << 1)) +#define ADC_INTR_REG_DLIMIT(x) BIT(8 + ((x) << 1)) +#define ADC_INTR_REG_LIMIT_MASK GENMASK(23, 8) +#define ADC_INTR_REG_COVFIN(x) BIT((x)) +#define ADC_INTR_REG_COVFIN_MASK GENMASK(7, 0) +#define ADC_COV_RESULT_REG(x) (0x38 + ((x) << 2)) +#define ADC_COV_RESULT_REG_MASK GENMASK(9, 0) +#define ADC_FINISH_CNT_REG(x) (0x58 + ((x) << 2)) +#define ADC_HIS_LIMIT_REG(x) (0x78 + ((x) << 2)) + +#define PHYTIUM_MAX_CHANNELS 8 +#define PHYTIUM_ADC_TIMEOUT usecs_to_jiffies(1000 * 1000) + +static const struct iio_event_spec phytium_adc_event[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, +}; + +struct phytium_adc_data { + const struct iio_chan_spec *channels; + u8 num_channels; +}; + +struct phytium_adc { + struct device *dev; + void __iomem *regs; + struct clk *adc_clk; + + u32 interval; + u16 thresh_high[PHYTIUM_MAX_CHANNELS]; + u16 thresh_low[PHYTIUM_MAX_CHANNELS]; + u16 last_val[PHYTIUM_MAX_CHANNELS]; + const struct phytium_adc_data *data; + u16 *scan_data; + + struct completion completion; + struct mutex lock; +}; + +static ssize_t phytium_adc_show_conv_interval(struct iio_dev *indio_dev, + uintptr_t priv, + struct iio_chan_spec const *ch, + char *buf) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + + return sprintf(buf, "%u\n", adc->interval); +} + +static ssize_t phytium_adc_store_conv_interval(struct iio_dev *indio_dev, + uintptr_t priv, + struct iio_chan_spec const *ch, + const char *buf, size_t len) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + u32 interval; + int ret; + + ret = kstrtou32(buf, 0, &interval); + if (ret < 0) + return ret; + + mutex_lock(&adc->lock); + adc->interval = interval; + mutex_unlock(&adc->lock); + + return len; +} + +static const struct iio_chan_spec_ext_info phytium_adc_ext_info[] = { + { + .name = "conv_interval", + .read = phytium_adc_show_conv_interval, + .write = phytium_adc_store_conv_interval, + }, + { /* sentinel */ } +}; + +static int phytium_adc_parse_properties(struct platform_device *pdev, struct phytium_adc *adc) +{ + struct iio_chan_spec *chan_array; + struct fwnode_handle *fwnode; + struct phytium_adc_data *data; + unsigned int channel; + int num_channels; + int ret, i = 0; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + num_channels = device_get_child_node_count(&pdev->dev); + if (!num_channels) { + dev_err(&pdev->dev, "no channel children\n"); + return -ENODEV; + } + + if (num_channels > PHYTIUM_MAX_CHANNELS) { + dev_err(&pdev->dev, "num of channel children out of range\n"); + return -EINVAL; + } + + chan_array = devm_kcalloc(&pdev->dev, num_channels, sizeof(*chan_array), + GFP_KERNEL); + if (!chan_array) + return -ENOMEM; + + device_for_each_child_node(&pdev->dev, fwnode) { + ret = fwnode_property_read_u32(fwnode, "reg", &channel); + if (ret) + return ret; + + if (channel >= PHYTIUM_MAX_CHANNELS) + return -EINVAL; + + chan_array[i].type = IIO_VOLTAGE; + chan_array[i].indexed = 1; + chan_array[i].channel = channel; + chan_array[i].info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan_array[i].event_spec = phytium_adc_event; + chan_array[i].num_event_specs = ARRAY_SIZE(phytium_adc_event); + chan_array[i].scan_index = channel; + chan_array[i].scan_type.sign = 'u'; + chan_array[i].scan_type.realbits = 10; + chan_array[i].scan_type.storagebits = 16; + chan_array[i].scan_type.endianness = IIO_LE; + chan_array[i].ext_info = phytium_adc_ext_info; + i++; + } + + data->num_channels = num_channels; + data->channels = chan_array; + adc->data = data; + + return 0; +} + +static void phytium_adc_start_stop(struct phytium_adc *adc, bool start) +{ + u32 ctrl; + + ctrl = readl(adc->regs + ADC_CTRL_REG); + if (start) + ctrl |= ADC_CTRL_REG_SOC_EN | ADC_CTRL_REG_SINGLE_EN; + else + ctrl &= ~ADC_CTRL_REG_SOC_EN; + /* Start conversion */ + writel(ctrl, adc->regs + ADC_CTRL_REG); +} + +static void phytium_adc_power_setup(struct phytium_adc *adc, bool on) +{ + u32 reg; + + reg = readl(adc->regs + ADC_CTRL_REG); + if (on) + reg &= ~ADC_CTRL_REG_PD_EN; + else + reg |= ADC_CTRL_REG_PD_EN; + writel(reg, adc->regs + ADC_CTRL_REG); +} + +static int phytium_adc_hw_init(struct phytium_adc *adc) +{ + int ret; + u32 reg; + + ret = clk_prepare_enable(adc->adc_clk); + if (ret) + return ret; + + /* + * Setup ctrl register: + * - Power up conversion module + * - Set the division by 4 as default + */ + reg = ADC_CTRL_REG_CLK_DIV(4); + writel(reg, adc->regs + ADC_CTRL_REG); + + /* Set all the interrupt mask, unmask them when necessary. */ + writel(0x1ffffff, adc->regs + ADC_INTRMASK_REG); + + /* Set default conversion interval */ + adc->interval = (clk_get_rate(adc->adc_clk) * 1000) / NSEC_PER_SEC; + + phytium_adc_power_setup(adc, true); + + return 0; +} + +static void phytium_adc_intrmask_setup(struct phytium_adc *adc, unsigned long chan_mask, bool on) +{ + u32 reg; + u16 limit_mask = 0; + int ch; + + for_each_set_bit(ch, &chan_mask, PHYTIUM_MAX_CHANNELS) + limit_mask |= BIT(ch << 1) | BIT((ch << 1) + 1); + + reg = readl(adc->regs + ADC_INTRMASK_REG); + if (on) + reg &= ~(ADC_INTRMASK_REG_ERR_INTR_MASK | + (limit_mask << 8) | chan_mask); + else + reg |= (ADC_INTRMASK_REG_ERR_INTR_MASK | + (limit_mask << 8) | chan_mask); + writel(reg, adc->regs + ADC_INTRMASK_REG); +} + +static void phytium_adc_single_conv_setup(struct phytium_adc *adc, u8 ch) +{ + u32 reg; + + /* + * Setup control register: + * - Single conversion mode selection + * - Single conversion enable + * - Fixed channel conversion + * - Target channel + */ + reg = readl(adc->regs + ADC_CTRL_REG); + + /* Clean ch_only_s bits */ + reg &= ~ADC_CTRL_REG_CH_ONLY_S(7); + + /* Clean channel_en bit */ + reg &= 0xFFF00F; + + reg |= ADC_CTRL_REG_SINGLE_SEL | ADC_CTRL_REG_SINGLE_EN | + ADC_CTRL_REG_CH_ONLY_EN | ADC_CTRL_REG_CH_ONLY_S(ch) | ADC_CTRL_REG_CHANNEL_EN(ch); + writel(reg, adc->regs + ADC_CTRL_REG); +} + +static int phytium_adc_single_conv(struct iio_dev *indio_dev, u8 ch) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + int ret; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + mutex_lock(&adc->lock); + + phytium_adc_intrmask_setup(adc, BIT(ch), true); + reinit_completion(&adc->completion); + phytium_adc_single_conv_setup(adc, ch); + phytium_adc_start_stop(adc, true); + + if (!wait_for_completion_timeout(&adc->completion, PHYTIUM_ADC_TIMEOUT)) + ret = -ETIMEDOUT; + + phytium_adc_start_stop(adc, false); + phytium_adc_intrmask_setup(adc, BIT(ch), false); + + mutex_unlock(&adc->lock); + iio_device_release_direct_mode(indio_dev); + + return ret; +} + +static int phytium_adc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (chan->type != IIO_VOLTAGE) + return -EINVAL; + + ret = phytium_adc_single_conv(indio_dev, chan->channel); + if (ret) + return ret; + *val = adc->last_val[chan->channel]; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int phytium_read_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info iinfo, int *val, int *val2) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + + if (dir == IIO_EV_DIR_FALLING) + *val = adc->thresh_low[chan->channel]; + else + *val = adc->thresh_high[chan->channel]; + + return IIO_VAL_INT; +} + +static int phytium_write_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info einfo, int val, int val2) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + u32 thresh; + + switch (dir) { + case IIO_EV_DIR_FALLING: + adc->thresh_low[chan->channel] = val; + thresh = readl(adc->regs + ADC_LEVEL_REG(chan->channel)) & 0x3ff0000; + thresh |= ADC_LEVEL_REG_LOW_LEVEL(val); + writel(thresh, adc->regs + ADC_LEVEL_REG(chan->channel)); + break; + case IIO_EV_DIR_RISING: + adc->thresh_high[chan->channel] = val; + thresh = readl(adc->regs + ADC_LEVEL_REG(chan->channel)) & 0xffff; + thresh |= ADC_LEVEL_REG_HIGH_LEVEL(val); + writel(thresh, adc->regs + ADC_LEVEL_REG(chan->channel)); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int phytium_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *mask) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + unsigned int n; + + n = bitmap_weight(mask, indio_dev->masklength); + + kfree(adc->scan_data); + adc->scan_data = kcalloc(n, sizeof(*adc->scan_data), GFP_KERNEL); + if (!adc->scan_data) + return -ENOMEM; + + return 0; +} + +static const u64 phytium_adc_event_codes[] = { + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 4, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 4, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 5, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 5, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 6, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 6, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 7, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 7, + IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), +}; + +static irqreturn_t phytium_adc_threaded_irq(int irq, void *data) +{ + struct iio_dev *indio_dev = data; + struct phytium_adc *adc = iio_priv(indio_dev); + s64 timestamp = iio_get_time_ns(indio_dev); + unsigned long status; + int ch; + u32 intr; + + intr = readl(adc->regs + ADC_INTR_REG); + + if (intr & ADC_INTR_REG_ERR) { + dev_err(adc->dev, "conversion error: ADC_INTR_REG(0x%x)\n", intr); + writel(ADC_INTR_REG_ERR, adc->regs + ADC_INTR_REG); + return IRQ_HANDLED; + } + + status = (intr & ADC_INTR_REG_LIMIT_MASK) >> 8; + if (status) { + for_each_set_bit(ch, &status, PHYTIUM_MAX_CHANNELS * 2) + iio_push_event(indio_dev, phytium_adc_event_codes[ch], timestamp); + } + + status = intr & ADC_INTR_REG_COVFIN_MASK; + if (status) { + for_each_set_bit(ch, &status, PHYTIUM_MAX_CHANNELS) + adc->last_val[ch] = readl(adc->regs + ADC_COV_RESULT_REG(ch)) & + ADC_COV_RESULT_REG_MASK; + + if (iio_buffer_enabled(indio_dev)) + iio_trigger_poll(indio_dev->trig); + else + complete(&adc->completion); + } + + /* Clear all the interrupts */ + writel(status, adc->regs + ADC_INTR_REG); + + return IRQ_HANDLED; +} + +static void phytium_adc_cont_conv_setup(struct phytium_adc *adc, + unsigned long chan_mask, + u32 interval) +{ + u32 reg; + + /* + * Setup control register: + * - Continuous conversion mode + * - Multi-channel rotation mode + * - Channel enablement + */ + reg = readl(adc->regs + ADC_CTRL_REG); + reg &= ~(ADC_CTRL_REG_SINGLE_SEL | ADC_CTRL_REG_SINGLE_EN | + ADC_CTRL_REG_CH_ONLY_EN); + reg |= chan_mask << 4; + writel(reg, adc->regs + ADC_CTRL_REG); + + /* Setup interval between two conversions */ + writel(interval, adc->regs + ADC_INTER_REG); +} + +static int phytium_adc_preenable(struct iio_dev *indio_dev) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + unsigned long scan_mask = *indio_dev->active_scan_mask; + + phytium_adc_cont_conv_setup(adc, scan_mask & 0xff, adc->interval); + phytium_adc_intrmask_setup(adc, scan_mask & 0xff, true); + + return 0; +} + +static int phytium_adc_postenable(struct iio_dev *indio_dev) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + + phytium_adc_start_stop(adc, true); + + return 0; +} + +static int phytium_adc_postdisable(struct iio_dev *indio_dev) +{ + struct phytium_adc *adc = iio_priv(indio_dev); + unsigned long scan_mask = *indio_dev->active_scan_mask; + + phytium_adc_start_stop(adc, false); + phytium_adc_intrmask_setup(adc, scan_mask & 0xff, false); + + return 0; +} + +static const struct iio_buffer_setup_ops phytium_buffer_setup_ops = { + .preenable = &phytium_adc_preenable, + .postenable = &phytium_adc_postenable, + .postdisable = &phytium_adc_postdisable, +}; + +static irqreturn_t phytium_adc_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct phytium_adc *adc = iio_priv(indio_dev); + int i, j = 0; + + if (!adc->scan_data) + goto out; + + for_each_set_bit(i, indio_dev->active_scan_mask, indio_dev->masklength) + adc->scan_data[j++] = adc->last_val[i]; + + iio_push_to_buffers(indio_dev, adc->scan_data); + +out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static const struct iio_info phytium_adc_iio_info = { + .read_raw = &phytium_adc_read_raw, + .read_event_value = &phytium_read_thresh, + .write_event_value = &phytium_write_thresh, + .update_scan_mode = &phytium_update_scan_mode, +}; + +static int phytium_adc_probe(struct platform_device *pdev) +{ + struct phytium_adc *adc; + struct iio_dev *indio_dev; + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*adc)); + if (!indio_dev) + return -ENOMEM; + + adc = iio_priv(indio_dev); + adc->dev = dev; + + ret = phytium_adc_parse_properties(pdev, adc); + if (ret) + return ret; + + mutex_init(&adc->lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + adc->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(adc->regs)) + return PTR_ERR(adc->regs); + + adc->adc_clk = devm_clk_get(dev, NULL); + if (IS_ERR(adc->adc_clk)) + return PTR_ERR(adc->adc_clk); + + init_completion(&adc->completion); + + indio_dev->name = dev_name(dev); + indio_dev->info = &phytium_adc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = adc->data->channels; + indio_dev->num_channels = adc->data->num_channels; + + platform_set_drvdata(pdev, indio_dev); + + ret = devm_request_threaded_irq(adc->dev, platform_get_irq(pdev, 0), + NULL, phytium_adc_threaded_irq, IRQF_ONESHOT, + dev_name(dev), indio_dev); + if (ret) + return ret; + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + &iio_pollfunc_store_time, + phytium_adc_trigger_handler, + &phytium_buffer_setup_ops); + if (ret) + return ret; + + ret = phytium_adc_hw_init(adc); + if (ret) { + dev_err(&pdev->dev, "failed to initialize Phytium ADC, %d\n", ret); + return ret; + } + + return iio_device_register(indio_dev); +} + +static int phytium_adc_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct phytium_adc *adc = iio_priv(indio_dev); + + phytium_adc_power_setup(adc, false); + iio_device_unregister(indio_dev); + kfree(adc->scan_data); + + return 0; +} + +static const struct of_device_id phytium_of_match[] = { + { .compatible = "phytium,adc", }, + { } +}; +MODULE_DEVICE_TABLE(of, phytium_of_match); + +#ifdef CONFIG_PM +static int phytium_adc_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct phytium_adc *adc = iio_priv(indio_dev); + + phytium_adc_power_setup(adc, false); + clk_disable_unprepare(adc->adc_clk); + + return 0; +} + +static int phytium_adc_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct phytium_adc *adc = iio_priv(indio_dev); + + clk_prepare_enable(adc->adc_clk); + phytium_adc_power_setup(adc, true); + + return 0; +} +#endif + +SIMPLE_DEV_PM_OPS(phytium_adc_pm_ops, phytium_adc_suspend, phytium_adc_resume); + +static struct platform_driver phytium_adc_driver = { + .driver = { + .name = "phytium_adc", + .of_match_table = phytium_of_match, + .pm = &phytium_adc_pm_ops, + }, + .probe = phytium_adc_probe, + .remove = phytium_adc_remove, +}; +module_platform_driver(phytium_adc_driver); + +MODULE_AUTHOR("Yang Liu "); +MODULE_DESCRIPTION("Phytium ADC driver"); +MODULE_LICENSE("GPL");