To compile this driver as a module, choose M here: the
module will be called rockchip_saradc.
+config SPEAR_ADC
+ tristate "ST SPEAr ADC"
+ depends on PLAT_SPEAR || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ Say yes here to build support for the integrated ADC inside the
+ ST SPEAr SoC. Provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called spear_adc.
+
config STM32_ADC_CORE
tristate "STMicroelectronics STM32 adc core"
depends on ARCH_STM32 || COMPILE_TEST
obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o
obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
+obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
obj-$(CONFIG_STX104) += stx104.o
obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
obj-$(CONFIG_STM32_ADC) += stm32-adc.o
--- /dev/null
+/*
+ * ST SPEAr ADC driver
+ *
+ * Copyright 2012 Stefan Roese <sr@denx.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/completion.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* SPEAR registers definitions */
+#define SPEAR600_ADC_SCAN_RATE_LO(x) ((x) & 0xFFFF)
+#define SPEAR600_ADC_SCAN_RATE_HI(x) (((x) >> 0x10) & 0xFFFF)
+#define SPEAR_ADC_CLK_LOW(x) (((x) & 0xf) << 0)
+#define SPEAR_ADC_CLK_HIGH(x) (((x) & 0xf) << 4)
+
+/* Bit definitions for SPEAR_ADC_STATUS */
+#define SPEAR_ADC_STATUS_START_CONVERSION BIT(0)
+#define SPEAR_ADC_STATUS_CHANNEL_NUM(x) ((x) << 1)
+#define SPEAR_ADC_STATUS_ADC_ENABLE BIT(4)
+#define SPEAR_ADC_STATUS_AVG_SAMPLE(x) ((x) << 5)
+#define SPEAR_ADC_STATUS_VREF_INTERNAL BIT(9)
+
+#define SPEAR_ADC_DATA_MASK 0x03ff
+#define SPEAR_ADC_DATA_BITS 10
+
+#define SPEAR_ADC_MOD_NAME "spear-adc"
+
+#define SPEAR_ADC_CHANNEL_NUM 8
+
+#define SPEAR_ADC_CLK_MIN 2500000
+#define SPEAR_ADC_CLK_MAX 20000000
+
+struct adc_regs_spear3xx {
+ u32 status;
+ u32 average;
+ u32 scan_rate;
+ u32 clk; /* Not avail for 1340 & 1310 */
+ u32 ch_ctrl[SPEAR_ADC_CHANNEL_NUM];
+ u32 ch_data[SPEAR_ADC_CHANNEL_NUM];
+};
+
+struct chan_data {
+ u32 lsb;
+ u32 msb;
+};
+
+struct adc_regs_spear6xx {
+ u32 status;
+ u32 pad[2];
+ u32 clk;
+ u32 ch_ctrl[SPEAR_ADC_CHANNEL_NUM];
+ struct chan_data ch_data[SPEAR_ADC_CHANNEL_NUM];
+ u32 scan_rate_lo;
+ u32 scan_rate_hi;
+ struct chan_data average;
+};
+
+struct spear_adc_state {
+ struct device_node *np;
+ struct adc_regs_spear3xx __iomem *adc_base_spear3xx;
+ struct adc_regs_spear6xx __iomem *adc_base_spear6xx;
+ struct clk *clk;
+ struct completion completion;
+ u32 current_clk;
+ u32 sampling_freq;
+ u32 avg_samples;
+ u32 vref_external;
+ u32 value;
+};
+
+/*
+ * Functions to access some SPEAr ADC register. Abstracted into
+ * static inline functions, because of different register offsets
+ * on different SoC variants (SPEAr300 vs SPEAr600 etc).
+ */
+static void spear_adc_set_status(struct spear_adc_state *st, u32 val)
+{
+ __raw_writel(val, &st->adc_base_spear6xx->status);
+}
+
+static void spear_adc_set_clk(struct spear_adc_state *st, u32 val)
+{
+ u32 clk_high, clk_low, count;
+ u32 apb_clk = clk_get_rate(st->clk);
+
+ count = DIV_ROUND_UP(apb_clk, val);
+ clk_low = count / 2;
+ clk_high = count - clk_low;
+ st->current_clk = apb_clk / count;
+
+ __raw_writel(SPEAR_ADC_CLK_LOW(clk_low) | SPEAR_ADC_CLK_HIGH(clk_high),
+ &st->adc_base_spear6xx->clk);
+}
+
+static void spear_adc_set_ctrl(struct spear_adc_state *st, int n,
+ u32 val)
+{
+ __raw_writel(val, &st->adc_base_spear6xx->ch_ctrl[n]);
+}
+
+static u32 spear_adc_get_average(struct spear_adc_state *st)
+{
+ if (of_device_is_compatible(st->np, "st,spear600-adc")) {
+ return __raw_readl(&st->adc_base_spear6xx->average.msb) &
+ SPEAR_ADC_DATA_MASK;
+ } else {
+ return __raw_readl(&st->adc_base_spear3xx->average) &
+ SPEAR_ADC_DATA_MASK;
+ }
+}
+
+static void spear_adc_set_scanrate(struct spear_adc_state *st, u32 rate)
+{
+ if (of_device_is_compatible(st->np, "st,spear600-adc")) {
+ __raw_writel(SPEAR600_ADC_SCAN_RATE_LO(rate),
+ &st->adc_base_spear6xx->scan_rate_lo);
+ __raw_writel(SPEAR600_ADC_SCAN_RATE_HI(rate),
+ &st->adc_base_spear6xx->scan_rate_hi);
+ } else {
+ __raw_writel(rate, &st->adc_base_spear3xx->scan_rate);
+ }
+}
+
+static int spear_adc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ struct spear_adc_state *st = iio_priv(indio_dev);
+ u32 status;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+
+ status = SPEAR_ADC_STATUS_CHANNEL_NUM(chan->channel) |
+ SPEAR_ADC_STATUS_AVG_SAMPLE(st->avg_samples) |
+ SPEAR_ADC_STATUS_START_CONVERSION |
+ SPEAR_ADC_STATUS_ADC_ENABLE;
+ if (st->vref_external == 0)
+ status |= SPEAR_ADC_STATUS_VREF_INTERNAL;
+
+ spear_adc_set_status(st, status);
+ wait_for_completion(&st->completion); /* set by ISR */
+ *val = st->value;
+
+ mutex_unlock(&indio_dev->mlock);
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ *val = st->vref_external;
+ *val2 = SPEAR_ADC_DATA_BITS;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = st->current_clk;
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static int spear_adc_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct spear_adc_state *st = iio_priv(indio_dev);
+ int ret = 0;
+
+ if (mask != IIO_CHAN_INFO_SAMP_FREQ)
+ return -EINVAL;
+
+ mutex_lock(&indio_dev->mlock);
+
+ if ((val < SPEAR_ADC_CLK_MIN) ||
+ (val > SPEAR_ADC_CLK_MAX) ||
+ (val2 != 0)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ spear_adc_set_clk(st, val);
+
+out:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+
+#define SPEAR_ADC_CHAN(idx) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
+ .channel = idx, \
+}
+
+static const struct iio_chan_spec spear_adc_iio_channels[] = {
+ SPEAR_ADC_CHAN(0),
+ SPEAR_ADC_CHAN(1),
+ SPEAR_ADC_CHAN(2),
+ SPEAR_ADC_CHAN(3),
+ SPEAR_ADC_CHAN(4),
+ SPEAR_ADC_CHAN(5),
+ SPEAR_ADC_CHAN(6),
+ SPEAR_ADC_CHAN(7),
+};
+
+static irqreturn_t spear_adc_isr(int irq, void *dev_id)
+{
+ struct spear_adc_state *st = dev_id;
+
+ /* Read value to clear IRQ */
+ st->value = spear_adc_get_average(st);
+ complete(&st->completion);
+
+ return IRQ_HANDLED;
+}
+
+static int spear_adc_configure(struct spear_adc_state *st)
+{
+ int i;
+
+ /* Reset ADC core */
+ spear_adc_set_status(st, 0);
+ __raw_writel(0, &st->adc_base_spear6xx->clk);
+ for (i = 0; i < 8; i++)
+ spear_adc_set_ctrl(st, i, 0);
+ spear_adc_set_scanrate(st, 0);
+
+ spear_adc_set_clk(st, st->sampling_freq);
+
+ return 0;
+}
+
+static const struct iio_info spear_adc_info = {
+ .read_raw = &spear_adc_read_raw,
+ .write_raw = &spear_adc_write_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static int spear_adc_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct spear_adc_state *st;
+ struct resource *res;
+ struct iio_dev *indio_dev = NULL;
+ int ret = -ENODEV;
+ int irq;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(struct spear_adc_state));
+ if (!indio_dev) {
+ dev_err(dev, "failed allocating iio device\n");
+ return -ENOMEM;
+ }
+
+ st = iio_priv(indio_dev);
+ st->np = np;
+
+ /*
+ * SPEAr600 has a different register layout than other SPEAr SoC's
+ * (e.g. SPEAr3xx). Let's provide two register base addresses
+ * to support multi-arch kernels.
+ */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ st->adc_base_spear6xx = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(st->adc_base_spear6xx))
+ return PTR_ERR(st->adc_base_spear6xx);
+
+ st->adc_base_spear3xx =
+ (struct adc_regs_spear3xx __iomem *)st->adc_base_spear6xx;
+
+ st->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(st->clk)) {
+ dev_err(dev, "failed getting clock\n");
+ return PTR_ERR(st->clk);
+ }
+
+ ret = clk_prepare_enable(st->clk);
+ if (ret) {
+ dev_err(dev, "failed enabling clock\n");
+ return ret;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ dev_err(dev, "failed getting interrupt resource\n");
+ ret = -EINVAL;
+ goto errout2;
+ }
+
+ ret = devm_request_irq(dev, irq, spear_adc_isr, 0, SPEAR_ADC_MOD_NAME,
+ st);
+ if (ret < 0) {
+ dev_err(dev, "failed requesting interrupt\n");
+ goto errout2;
+ }
+
+ if (of_property_read_u32(np, "sampling-frequency",
+ &st->sampling_freq)) {
+ dev_err(dev, "sampling-frequency missing in DT\n");
+ ret = -EINVAL;
+ goto errout2;
+ }
+
+ /*
+ * Optional avg_samples defaults to 0, resulting in single data
+ * conversion
+ */
+ of_property_read_u32(np, "average-samples", &st->avg_samples);
+
+ /*
+ * Optional vref_external defaults to 0, resulting in internal vref
+ * selection
+ */
+ of_property_read_u32(np, "vref-external", &st->vref_external);
+
+ spear_adc_configure(st);
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ init_completion(&st->completion);
+
+ indio_dev->name = SPEAR_ADC_MOD_NAME;
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &spear_adc_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = spear_adc_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(spear_adc_iio_channels);
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto errout2;
+
+ dev_info(dev, "SPEAR ADC driver loaded, IRQ %d\n", irq);
+
+ return 0;
+
+errout2:
+ clk_disable_unprepare(st->clk);
+ return ret;
+}
+
+static int spear_adc_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct spear_adc_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ clk_disable_unprepare(st->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id spear_adc_dt_ids[] = {
+ { .compatible = "st,spear600-adc", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spear_adc_dt_ids);
+#endif
+
+static struct platform_driver spear_adc_driver = {
+ .probe = spear_adc_probe,
+ .remove = spear_adc_remove,
+ .driver = {
+ .name = SPEAR_ADC_MOD_NAME,
+ .of_match_table = of_match_ptr(spear_adc_dt_ids),
+ },
+};
+
+module_platform_driver(spear_adc_driver);
+
+MODULE_AUTHOR("Stefan Roese <sr@denx.de>");
+MODULE_DESCRIPTION("SPEAr ADC driver");
+MODULE_LICENSE("GPL");
activate only one via device tree selection. Provides direct access
via sysfs.
-config SPEAR_ADC
- tristate "ST SPEAr ADC"
- depends on PLAT_SPEAR || COMPILE_TEST
- depends on HAS_IOMEM
- help
- Say yes here to build support for the integrated ADC inside the
- ST SPEAr SoC. Provides direct access via sysfs.
-
- To compile this driver as a module, choose M here: the
- module will be called spear_adc.
endmenu
obj-$(CONFIG_AD7192) += ad7192.o
obj-$(CONFIG_AD7280) += ad7280a.o
obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
-obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
+++ /dev/null
-/*
- * ST SPEAr ADC driver
- *
- * Copyright 2012 Stefan Roese <sr@denx.de>
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/completion.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-
-/* SPEAR registers definitions */
-#define SPEAR600_ADC_SCAN_RATE_LO(x) ((x) & 0xFFFF)
-#define SPEAR600_ADC_SCAN_RATE_HI(x) (((x) >> 0x10) & 0xFFFF)
-#define SPEAR_ADC_CLK_LOW(x) (((x) & 0xf) << 0)
-#define SPEAR_ADC_CLK_HIGH(x) (((x) & 0xf) << 4)
-
-/* Bit definitions for SPEAR_ADC_STATUS */
-#define SPEAR_ADC_STATUS_START_CONVERSION BIT(0)
-#define SPEAR_ADC_STATUS_CHANNEL_NUM(x) ((x) << 1)
-#define SPEAR_ADC_STATUS_ADC_ENABLE BIT(4)
-#define SPEAR_ADC_STATUS_AVG_SAMPLE(x) ((x) << 5)
-#define SPEAR_ADC_STATUS_VREF_INTERNAL BIT(9)
-
-#define SPEAR_ADC_DATA_MASK 0x03ff
-#define SPEAR_ADC_DATA_BITS 10
-
-#define SPEAR_ADC_MOD_NAME "spear-adc"
-
-#define SPEAR_ADC_CHANNEL_NUM 8
-
-#define SPEAR_ADC_CLK_MIN 2500000
-#define SPEAR_ADC_CLK_MAX 20000000
-
-struct adc_regs_spear3xx {
- u32 status;
- u32 average;
- u32 scan_rate;
- u32 clk; /* Not avail for 1340 & 1310 */
- u32 ch_ctrl[SPEAR_ADC_CHANNEL_NUM];
- u32 ch_data[SPEAR_ADC_CHANNEL_NUM];
-};
-
-struct chan_data {
- u32 lsb;
- u32 msb;
-};
-
-struct adc_regs_spear6xx {
- u32 status;
- u32 pad[2];
- u32 clk;
- u32 ch_ctrl[SPEAR_ADC_CHANNEL_NUM];
- struct chan_data ch_data[SPEAR_ADC_CHANNEL_NUM];
- u32 scan_rate_lo;
- u32 scan_rate_hi;
- struct chan_data average;
-};
-
-struct spear_adc_state {
- struct device_node *np;
- struct adc_regs_spear3xx __iomem *adc_base_spear3xx;
- struct adc_regs_spear6xx __iomem *adc_base_spear6xx;
- struct clk *clk;
- struct completion completion;
- u32 current_clk;
- u32 sampling_freq;
- u32 avg_samples;
- u32 vref_external;
- u32 value;
-};
-
-/*
- * Functions to access some SPEAr ADC register. Abstracted into
- * static inline functions, because of different register offsets
- * on different SoC variants (SPEAr300 vs SPEAr600 etc).
- */
-static void spear_adc_set_status(struct spear_adc_state *st, u32 val)
-{
- __raw_writel(val, &st->adc_base_spear6xx->status);
-}
-
-static void spear_adc_set_clk(struct spear_adc_state *st, u32 val)
-{
- u32 clk_high, clk_low, count;
- u32 apb_clk = clk_get_rate(st->clk);
-
- count = DIV_ROUND_UP(apb_clk, val);
- clk_low = count / 2;
- clk_high = count - clk_low;
- st->current_clk = apb_clk / count;
-
- __raw_writel(SPEAR_ADC_CLK_LOW(clk_low) | SPEAR_ADC_CLK_HIGH(clk_high),
- &st->adc_base_spear6xx->clk);
-}
-
-static void spear_adc_set_ctrl(struct spear_adc_state *st, int n,
- u32 val)
-{
- __raw_writel(val, &st->adc_base_spear6xx->ch_ctrl[n]);
-}
-
-static u32 spear_adc_get_average(struct spear_adc_state *st)
-{
- if (of_device_is_compatible(st->np, "st,spear600-adc")) {
- return __raw_readl(&st->adc_base_spear6xx->average.msb) &
- SPEAR_ADC_DATA_MASK;
- } else {
- return __raw_readl(&st->adc_base_spear3xx->average) &
- SPEAR_ADC_DATA_MASK;
- }
-}
-
-static void spear_adc_set_scanrate(struct spear_adc_state *st, u32 rate)
-{
- if (of_device_is_compatible(st->np, "st,spear600-adc")) {
- __raw_writel(SPEAR600_ADC_SCAN_RATE_LO(rate),
- &st->adc_base_spear6xx->scan_rate_lo);
- __raw_writel(SPEAR600_ADC_SCAN_RATE_HI(rate),
- &st->adc_base_spear6xx->scan_rate_hi);
- } else {
- __raw_writel(rate, &st->adc_base_spear3xx->scan_rate);
- }
-}
-
-static int spear_adc_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long mask)
-{
- struct spear_adc_state *st = iio_priv(indio_dev);
- u32 status;
-
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
-
- status = SPEAR_ADC_STATUS_CHANNEL_NUM(chan->channel) |
- SPEAR_ADC_STATUS_AVG_SAMPLE(st->avg_samples) |
- SPEAR_ADC_STATUS_START_CONVERSION |
- SPEAR_ADC_STATUS_ADC_ENABLE;
- if (st->vref_external == 0)
- status |= SPEAR_ADC_STATUS_VREF_INTERNAL;
-
- spear_adc_set_status(st, status);
- wait_for_completion(&st->completion); /* set by ISR */
- *val = st->value;
-
- mutex_unlock(&indio_dev->mlock);
-
- return IIO_VAL_INT;
-
- case IIO_CHAN_INFO_SCALE:
- *val = st->vref_external;
- *val2 = SPEAR_ADC_DATA_BITS;
- return IIO_VAL_FRACTIONAL_LOG2;
- case IIO_CHAN_INFO_SAMP_FREQ:
- *val = st->current_clk;
- return IIO_VAL_INT;
- }
-
- return -EINVAL;
-}
-
-static int spear_adc_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
-{
- struct spear_adc_state *st = iio_priv(indio_dev);
- int ret = 0;
-
- if (mask != IIO_CHAN_INFO_SAMP_FREQ)
- return -EINVAL;
-
- mutex_lock(&indio_dev->mlock);
-
- if ((val < SPEAR_ADC_CLK_MIN) ||
- (val > SPEAR_ADC_CLK_MAX) ||
- (val2 != 0)) {
- ret = -EINVAL;
- goto out;
- }
-
- spear_adc_set_clk(st, val);
-
-out:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-
-#define SPEAR_ADC_CHAN(idx) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
- .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
- .channel = idx, \
-}
-
-static const struct iio_chan_spec spear_adc_iio_channels[] = {
- SPEAR_ADC_CHAN(0),
- SPEAR_ADC_CHAN(1),
- SPEAR_ADC_CHAN(2),
- SPEAR_ADC_CHAN(3),
- SPEAR_ADC_CHAN(4),
- SPEAR_ADC_CHAN(5),
- SPEAR_ADC_CHAN(6),
- SPEAR_ADC_CHAN(7),
-};
-
-static irqreturn_t spear_adc_isr(int irq, void *dev_id)
-{
- struct spear_adc_state *st = dev_id;
-
- /* Read value to clear IRQ */
- st->value = spear_adc_get_average(st);
- complete(&st->completion);
-
- return IRQ_HANDLED;
-}
-
-static int spear_adc_configure(struct spear_adc_state *st)
-{
- int i;
-
- /* Reset ADC core */
- spear_adc_set_status(st, 0);
- __raw_writel(0, &st->adc_base_spear6xx->clk);
- for (i = 0; i < 8; i++)
- spear_adc_set_ctrl(st, i, 0);
- spear_adc_set_scanrate(st, 0);
-
- spear_adc_set_clk(st, st->sampling_freq);
-
- return 0;
-}
-
-static const struct iio_info spear_adc_info = {
- .read_raw = &spear_adc_read_raw,
- .write_raw = &spear_adc_write_raw,
- .driver_module = THIS_MODULE,
-};
-
-static int spear_adc_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct device *dev = &pdev->dev;
- struct spear_adc_state *st;
- struct resource *res;
- struct iio_dev *indio_dev = NULL;
- int ret = -ENODEV;
- int irq;
-
- indio_dev = devm_iio_device_alloc(dev, sizeof(struct spear_adc_state));
- if (!indio_dev) {
- dev_err(dev, "failed allocating iio device\n");
- return -ENOMEM;
- }
-
- st = iio_priv(indio_dev);
- st->np = np;
-
- /*
- * SPEAr600 has a different register layout than other SPEAr SoC's
- * (e.g. SPEAr3xx). Let's provide two register base addresses
- * to support multi-arch kernels.
- */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- st->adc_base_spear6xx = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(st->adc_base_spear6xx))
- return PTR_ERR(st->adc_base_spear6xx);
-
- st->adc_base_spear3xx =
- (struct adc_regs_spear3xx __iomem *)st->adc_base_spear6xx;
-
- st->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(st->clk)) {
- dev_err(dev, "failed getting clock\n");
- return PTR_ERR(st->clk);
- }
-
- ret = clk_prepare_enable(st->clk);
- if (ret) {
- dev_err(dev, "failed enabling clock\n");
- return ret;
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq <= 0) {
- dev_err(dev, "failed getting interrupt resource\n");
- ret = -EINVAL;
- goto errout2;
- }
-
- ret = devm_request_irq(dev, irq, spear_adc_isr, 0, SPEAR_ADC_MOD_NAME,
- st);
- if (ret < 0) {
- dev_err(dev, "failed requesting interrupt\n");
- goto errout2;
- }
-
- if (of_property_read_u32(np, "sampling-frequency",
- &st->sampling_freq)) {
- dev_err(dev, "sampling-frequency missing in DT\n");
- ret = -EINVAL;
- goto errout2;
- }
-
- /*
- * Optional avg_samples defaults to 0, resulting in single data
- * conversion
- */
- of_property_read_u32(np, "average-samples", &st->avg_samples);
-
- /*
- * Optional vref_external defaults to 0, resulting in internal vref
- * selection
- */
- of_property_read_u32(np, "vref-external", &st->vref_external);
-
- spear_adc_configure(st);
-
- platform_set_drvdata(pdev, indio_dev);
-
- init_completion(&st->completion);
-
- indio_dev->name = SPEAR_ADC_MOD_NAME;
- indio_dev->dev.parent = dev;
- indio_dev->info = &spear_adc_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = spear_adc_iio_channels;
- indio_dev->num_channels = ARRAY_SIZE(spear_adc_iio_channels);
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto errout2;
-
- dev_info(dev, "SPEAR ADC driver loaded, IRQ %d\n", irq);
-
- return 0;
-
-errout2:
- clk_disable_unprepare(st->clk);
- return ret;
-}
-
-static int spear_adc_remove(struct platform_device *pdev)
-{
- struct iio_dev *indio_dev = platform_get_drvdata(pdev);
- struct spear_adc_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- clk_disable_unprepare(st->clk);
-
- return 0;
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id spear_adc_dt_ids[] = {
- { .compatible = "st,spear600-adc", },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, spear_adc_dt_ids);
-#endif
-
-static struct platform_driver spear_adc_driver = {
- .probe = spear_adc_probe,
- .remove = spear_adc_remove,
- .driver = {
- .name = SPEAR_ADC_MOD_NAME,
- .of_match_table = of_match_ptr(spear_adc_dt_ids),
- },
-};
-
-module_platform_driver(spear_adc_driver);
-
-MODULE_AUTHOR("Stefan Roese <sr@denx.de>");
-MODULE_DESCRIPTION("SPEAr ADC driver");
-MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / commitdiff