[PATCH 2/3] iio: Add driver for Broadcom iproc-static-adc
Raveendra Padasalagi
raveendra.padasalagi at broadcom.com
Tue Jun 14 23:38:40 PDT 2016
This patch adds basic driver implementation for Broadcom's
static adc controller used in iProc SoC's family.
Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi at broadcom.com>
Reviewed-by: Ray Jui <ray.jui at broadcom.com>
Reviewed-by: Scott Branden <scott.branden at broadcom.com>
---
drivers/iio/adc/Kconfig | 12 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/bcm_iproc_adc.c | 556 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 569 insertions(+)
create mode 100644 drivers/iio/adc/bcm_iproc_adc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 25378c5..86ce29d 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -160,6 +160,18 @@ config BERLIN2_ADC
Marvell Berlin2 ADC driver. This ADC has 8 channels, with one used for
temperature measurement.
+config BCM_IPROC_ADC
+ tristate "Broadcom IPROC ADC driver"
+ depends on ARCH_BCM_IPROC || COMPILE_TEST
+ depends on MFD_SYSCON
+ default ARCH_BCM_CYGNUS
+ help
+ Say Y here if you want to add support for the Broadcom static
+ ADC driver.
+
+ The driver allows the user to read the values
+ from the static ADC.
+
config CC10001_ADC
tristate "Cosmic Circuits 10001 ADC driver"
depends on HAS_IOMEM && HAVE_CLK && REGULATOR
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 38638d4..0ba0d50 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_AD799X) += ad799x.o
obj-$(CONFIG_AT91_ADC) += at91_adc.o
obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o
obj-$(CONFIG_AXP288_ADC) += axp288_adc.o
+obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o
obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o
obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o
obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
diff --git a/drivers/iio/adc/bcm_iproc_adc.c b/drivers/iio/adc/bcm_iproc_adc.c
new file mode 100644
index 0000000..6117db7
--- /dev/null
+++ b/drivers/iio/adc/bcm_iproc_adc.c
@@ -0,0 +1,556 @@
+/*
+ * Copyright 2016 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation (the "GPL").
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 (GPLv2) for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 (GPLv2) along with this source code.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
+
+#define ADC_READ_TIMEOUT (HZ*2)
+
+/* Register offsets */
+#define REGCTL1 0x00
+#define REGCTL2 0x04
+#define INTERRUPT_THRES 0x08
+#define INTRPT_MASK 0x0c
+#define INTRPT_STATUS 0x10
+#define ANALOG_CONTROL 0x1c
+#define CONTROLLER_STATUS 0x14
+#define AUX_DATA 0x20
+#define SOFT_BYPASS_CONTROL 0x38
+#define SOFT_BYPASS_DATA 0x3C
+
+/* ADC Channel register offsets */
+#define ADC_CHANNEL_REGCTL1 (0x800)
+#define ADC_CHANNEL_REGCTL2 (0x804)
+#define ADC_CHANNEL_STATUS (0x808)
+#define ADC_CHANNEL_INTERRUPT_STATUS (0x80c)
+#define ADC_CHANNEL_INTERRUPT_MASK (0x810)
+#define ADC_CHANNEL_DATA (0x814)
+#define ADC_CHANNEL_OFFSET (0x20)
+/* Masks for RegCtl2 */
+#define ADC_AUXIN_SCAN_ENA (1 << 0)
+#define ADC_PWR_LDO (1 << 5)
+#define ADC_PWR_ADC (1 << 4)
+#define ADC_PWR_BG (1 << 3)
+#define ADC_CONTROLLER_EN (1 << 17)
+
+/* Masks for Interrupt_Mask and Interrupt_Status reg */
+#define ADC_AUXDATA_RDY_INTR (1 << 3)
+#define ADC_INTR_SHIFT 9
+#define ADC_INTR_MASK (0xFF << ADC_INTR_SHIFT)
+
+/* Number of time to retry a set of the interrupt mask reg */
+#define INTMASK_RETRY_ATTEMPTS 10
+
+/* ANALOG_CONTROL Bit Masks */
+#define CHANNEL_SEL_SHIFT 11
+#define CHANNEL_SEL_MASK (0x7 << CHANNEL_SEL_SHIFT)
+
+/* ADC_CHANNEL_REGCTL1 Bit Masks */
+#define CHANNEL_ROUNDS_SHIFT 0x2
+#define CHANNEL_ROUNDS_MASK (0x3F << CHANNEL_ROUNDS_SHIFT)
+#define CHANNEL_MODE_SHIFT 0x1
+#define CHANNEL_MODE_MASK (0x1 << CHANNEL_MODE_SHIFT)
+#define CHANNEL_MODE_TDM (0x1)
+#define CHANNEL_MODE_SNAPSHOT (0x0)
+#define CHANNEL_ENABLE_SHIFT 0x0
+#define CHANNEL_ENABLE_MASK (0x1)
+
+#define CHANNEL_ENABLE (0x1)
+#define CHANNEL_DISABLE (0x0)
+
+/* ADC_CHANNEL_REGCTL2 Bit Masks */
+#define CHANNEL_WATERMARK_SHIFT 0x0
+#define CHANNEL_WATERMARK_MASK (0x3F << CHANNEL_WATERMARK_SHIFT)
+
+#define WATER_MARK_LEVEL (0x1)
+
+/* ADC_CHANNEL_STATUS Bit Masks */
+#define CHANNEL_DATA_LOST_SHIFT 0x0
+#define CHANNEL_DATA_LOST_MASK (0x0 << CHANNEL_DATA_LOST_SHIFT)
+#define CHANNEL_VALID_ENTERIES_SHIFT 0x1
+#define CHANNEL_VALID_ENTERIES_MASK (0xFF << CHANNEL_VALID_ENTERIES_SHIFT)
+#define CHANNEL_TOTAL_ENTERIES_SHIFT 0x9
+#define CHANNEL_TOTAL_ENTERIES_MASK (0xFF << CHANNEL_TOTAL_ENTERIES_SHIFT)
+
+/* ADC_CHANNEL_INTERRUPT_MASK Bit Masks */
+#define CHANNEL_WTRMRK_INTR_SHIFT (0x0)
+#define CHANNEL_WTRMRK_INTR_MASK (0x1 << CHANNEL_WTRMRK_INTR_SHIFT)
+#define CHANNEL_FULL_INTR_SHIFT 0x1
+#define CHANNEL_FULL_INTR_MASK (0x1 << CHANNEL_FULL_INTR_SHIFT)
+#define CHANNEL_EMPTY_INTR_SHIFT 0x2
+#define CHANNEL_EMPTY_INTR_MASK (0x1 << CHANNEL_EMPTY_INTR_SHIFT)
+
+#define WATER_MARK_INTR_ENABLE (0x1)
+
+#define dbg_reg(dev, priv, reg) \
+do { \
+ u32 val; \
+ regmap_read(priv->regmap, reg, &val); \
+ dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \
+} while (0)
+
+struct iproc_adc_priv {
+ struct regmap *regmap;
+ struct clk *adc_clk;
+ struct mutex mutex;
+ int irqno;
+ int chan_val;
+ int chan_id; /* Channel id */
+ struct completion completion;
+};
+
+static void iproc_adc_reg_dump(struct iio_dev *indio_dev)
+{
+ struct iproc_adc_priv *adc_priv;
+ struct device *dev = &indio_dev->dev;
+
+ adc_priv = iio_priv(indio_dev);
+
+ dbg_reg(dev, adc_priv, REGCTL1);
+ dbg_reg(dev, adc_priv, REGCTL2);
+ dbg_reg(dev, adc_priv, INTERRUPT_THRES);
+ dbg_reg(dev, adc_priv, INTRPT_MASK);
+ dbg_reg(dev, adc_priv, INTRPT_STATUS);
+ dbg_reg(dev, adc_priv, CONTROLLER_STATUS);
+ dbg_reg(dev, adc_priv, ANALOG_CONTROL);
+ dbg_reg(dev, adc_priv, AUX_DATA);
+ dbg_reg(dev, adc_priv, SOFT_BYPASS_CONTROL);
+ dbg_reg(dev, adc_priv, SOFT_BYPASS_DATA);
+}
+
+static irqreturn_t iproc_adc_interrupt_handler(int irq, void *data)
+{
+ struct iproc_adc_priv *adc_priv;
+ struct iio_dev *indio_dev = data;
+ u32 channel_intr_status = 0;
+ u32 intr_status = 0;
+ u32 intr_mask = 0;
+ irqreturn_t retval = IRQ_NONE;
+
+ adc_priv = iio_priv(indio_dev);
+
+ /* This interrupt is shared with the touchscreen driver.
+ * Make sure this interrupt is intended for us.
+ * Handle only ADC channel specific interrupts.
+ */
+ regmap_read(adc_priv->regmap, INTRPT_STATUS, &intr_status);
+ regmap_read(adc_priv->regmap, INTRPT_MASK, &intr_mask);
+ intr_status = intr_status & intr_mask;
+ channel_intr_status = (intr_status & ADC_INTR_MASK) >> (ADC_INTR_SHIFT);
+ if (channel_intr_status)
+ retval = IRQ_WAKE_THREAD;
+ return retval;
+}
+
+static irqreturn_t iproc_adc_interrupt_thread(int irq, void *data)
+{
+ irqreturn_t retval = IRQ_NONE;
+ struct iproc_adc_priv *adc_priv;
+ struct iio_dev *indio_dev = data;
+ unsigned int valid_entries;
+ u32 intr_status = 0;
+ u32 intr_channels = 0;
+ u32 channel_status = 0;
+ u32 ch_intr_status = 0;
+
+ adc_priv = iio_priv(indio_dev);
+
+ regmap_read(adc_priv->regmap, INTRPT_STATUS, &intr_status);
+ dev_dbg(&indio_dev->dev, "iproc_adc_interrupt_work(), INTSTS:%x\n",
+ intr_status);
+
+ intr_channels = (intr_status & ADC_INTR_MASK) >> (ADC_INTR_SHIFT);
+ if (intr_channels) {
+ regmap_read(adc_priv->regmap,
+ ADC_CHANNEL_INTERRUPT_STATUS +
+ ADC_CHANNEL_OFFSET * adc_priv->chan_id,
+ &ch_intr_status);
+ if (ch_intr_status & CHANNEL_WTRMRK_INTR_MASK) {
+ regmap_write(adc_priv->regmap,
+ ADC_CHANNEL_INTERRUPT_MASK +
+ ADC_CHANNEL_OFFSET *
+ adc_priv->chan_id,
+ (ch_intr_status &
+ ~(CHANNEL_WTRMRK_INTR_MASK)));
+
+ regmap_read(adc_priv->regmap,
+ ADC_CHANNEL_STATUS +
+ ADC_CHANNEL_OFFSET * adc_priv->chan_id,
+ &channel_status);
+
+ valid_entries = ((channel_status &
+ CHANNEL_VALID_ENTERIES_MASK) >>
+ CHANNEL_VALID_ENTERIES_SHIFT);
+ if (valid_entries >= 1) {
+ regmap_read(adc_priv->regmap,
+ ADC_CHANNEL_DATA +
+ ADC_CHANNEL_OFFSET *
+ adc_priv->chan_id,
+ &adc_priv->chan_val);
+ complete(&adc_priv->completion);
+ } else {
+ dev_err(&indio_dev->dev,
+ "No data rcvd on channel %d\n",
+ adc_priv->chan_id);
+ }
+ }
+ regmap_write(adc_priv->regmap,
+ ADC_CHANNEL_INTERRUPT_STATUS +
+ ADC_CHANNEL_OFFSET * adc_priv->chan_id,
+ ch_intr_status);
+ regmap_write(adc_priv->regmap, INTRPT_STATUS, intr_channels);
+ retval = IRQ_HANDLED;
+ }
+ return retval;
+}
+
+int bcm_iproc_adc_read_raw(struct iio_dev *indio_dev,
+ int channel,
+ u16 *p_adc_data16)
+{
+ int read_len = 0;
+ u32 val;
+ u32 mask;
+ u32 val_check;
+ int failed_cnt = 0;
+ struct iproc_adc_priv *adc_priv;
+
+ adc_priv = iio_priv(indio_dev);
+
+ mutex_lock(&adc_priv->mutex);
+
+ /* After a read is complete the ADC interrupts will be disabled so
+ * we can assume this section of code is save from interrupts.
+ */
+ adc_priv->chan_val = -1;
+ adc_priv->chan_id = channel;
+
+ reinit_completion(&adc_priv->completion);
+ /* Clear any pending interrupt */
+ regmap_update_bits(adc_priv->regmap, INTRPT_STATUS, ADC_INTR_MASK |
+ ADC_AUXDATA_RDY_INTR, ((CHANNEL_DISABLE << channel)<<
+ ADC_INTR_SHIFT) | ADC_AUXDATA_RDY_INTR);
+
+ /* Configure channel for snapshot mode and enable */
+ val = (BIT(CHANNEL_ROUNDS_SHIFT) |
+ (CHANNEL_MODE_SNAPSHOT << CHANNEL_MODE_SHIFT) |
+ (CHANNEL_ENABLE << CHANNEL_ENABLE_SHIFT));
+
+ mask = CHANNEL_ROUNDS_MASK | CHANNEL_MODE_MASK | CHANNEL_ENABLE_MASK;
+ regmap_update_bits(adc_priv->regmap, (ADC_CHANNEL_REGCTL1 +
+ ADC_CHANNEL_OFFSET * channel),
+ mask, val);
+
+ /* Set the Watermark for a channel */
+ regmap_update_bits(adc_priv->regmap, (ADC_CHANNEL_REGCTL2 +
+ ADC_CHANNEL_OFFSET * channel),
+ CHANNEL_WATERMARK_MASK, WATER_MARK_LEVEL);
+
+ /* Enable water mark interrupt */
+ regmap_update_bits(adc_priv->regmap, (ADC_CHANNEL_INTERRUPT_MASK +
+ ADC_CHANNEL_OFFSET * channel),
+ CHANNEL_WTRMRK_INTR_MASK, WATER_MARK_INTR_ENABLE);
+ regmap_read(adc_priv->regmap, INTRPT_MASK, &val);
+
+ /* Enable ADC interrupt for a channel */
+ val |= (BIT(channel) << ADC_INTR_SHIFT);
+ regmap_write(adc_priv->regmap, INTRPT_MASK, val);
+
+ /* There seems to be a very rare issue where writing to this register
+ * does not take effect. To work around the issue we will try multiple
+ * writes. In total we will spend about 10*10 = 100 us attempting this.
+ * Testing has shown that this may loop a few time, but we have never
+ * hit the full count.
+ */
+ regmap_read(adc_priv->regmap, INTRPT_MASK, &val_check);
+ while (val_check != val) {
+ failed_cnt++;
+
+ if (failed_cnt > INTMASK_RETRY_ATTEMPTS)
+ break;
+
+ udelay(10);
+ regmap_update_bits(adc_priv->regmap, INTRPT_MASK,
+ ADC_INTR_MASK,
+ ((CHANNEL_ENABLE << channel) <<
+ ADC_INTR_SHIFT));
+
+ regmap_read(adc_priv->regmap, INTRPT_MASK, &val_check);
+ }
+
+ if (failed_cnt) {
+ dev_dbg(&indio_dev->dev,
+ "IntMask failed (%d times)", failed_cnt);
+ if (failed_cnt > INTMASK_RETRY_ATTEMPTS) {
+ dev_err(&indio_dev->dev,
+ "IntMask set failed. Read will likely fail.");
+ read_len = -EIO;
+ goto adc_err;
+ };
+ }
+ regmap_read(adc_priv->regmap, INTRPT_MASK, &val_check);
+
+ if (wait_for_completion_timeout(&adc_priv->completion,
+ ADC_READ_TIMEOUT) > 0) {
+
+ /* Only the lower 16 bits are relevant */
+ *p_adc_data16 = adc_priv->chan_val & 0xFFFF;
+ read_len = sizeof(*p_adc_data16);
+
+ } else {
+ /* We never got the interrupt, something went wrong.
+ * Perhaps the interrupt may still be coming, we do not want
+ * that now. Lets disable the ADC interrupt, and clear the
+ * status to put it back in to normal state.
+ */
+ read_len = -ETIMEDOUT;
+ goto adc_err;
+ }
+ mutex_unlock(&adc_priv->mutex);
+ return read_len;
+
+adc_err:
+ regmap_update_bits(adc_priv->regmap, INTRPT_MASK,
+ ADC_INTR_MASK,
+ ((CHANNEL_DISABLE << channel) << ADC_INTR_SHIFT));
+
+ regmap_update_bits(adc_priv->regmap, INTRPT_STATUS,
+ ADC_INTR_MASK, ((CHANNEL_DISABLE << channel)
+ << ADC_INTR_SHIFT));
+
+ dev_err(&indio_dev->dev, "Timed out waiting for ADC data!\n");
+ iproc_adc_reg_dump(indio_dev);
+ mutex_unlock(&adc_priv->mutex);
+ return read_len;
+}
+
+
+static void iproc_adc_enable(struct iio_dev *indio_dev)
+{
+ u32 val;
+ u32 channel_id;
+ struct iproc_adc_priv *adc_priv;
+
+ adc_priv = iio_priv(indio_dev);
+
+ /* Set i_amux = 3b'000, select channel 0 */
+ regmap_update_bits(adc_priv->regmap, ANALOG_CONTROL,
+ CHANNEL_SEL_MASK, 0);
+ adc_priv->chan_val = -1;
+
+ /* PWR up LDO, ADC, and Band Gap (0 to enable)
+ * Also enable ADC controller (set high)
+ */
+ regmap_read(adc_priv->regmap, REGCTL2, &val);
+
+ val &= ~(ADC_PWR_LDO | ADC_PWR_ADC | ADC_PWR_BG);
+
+ regmap_write(adc_priv->regmap, REGCTL2, val);
+
+ regmap_read(adc_priv->regmap, REGCTL2, &val);
+ val |= ADC_CONTROLLER_EN;
+ regmap_write(adc_priv->regmap, REGCTL2, val);
+ for (channel_id = 0; channel_id < indio_dev->num_channels;
+ channel_id++) {
+ regmap_write(adc_priv->regmap, ADC_CHANNEL_INTERRUPT_MASK +
+ ADC_CHANNEL_OFFSET * channel_id, 0);
+ regmap_write(adc_priv->regmap, ADC_CHANNEL_INTERRUPT_STATUS +
+ ADC_CHANNEL_OFFSET * channel_id, 0);
+ }
+}
+
+
+static int iproc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ u16 adc_data16;
+ int err;
+
+ dev_dbg(&indio_dev->dev, "iproc_read_raw: channel no-%d\n",
+ chan->channel);
+
+ if (mask != IIO_CHAN_INFO_RAW)
+ return -EINVAL;
+
+ err = bcm_iproc_adc_read_raw(indio_dev,
+ chan->channel,
+ &adc_data16);
+ if (err < 0)
+ return err;
+
+ *val = adc_data16;
+ *val2 = 0;
+ return IIO_VAL_INT;
+}
+
+static const struct iio_info iproc_adc_iio_info = {
+ .read_raw = &iproc_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+#define ADC_CHANNEL(_index, _id) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = _index, \
+ .scan_index = _index, \
+ .address = _index, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .datasheet_name = _id, \
+ .scan_type.sign = 'u', \
+ .scan_type.realbits = 10, \
+ .scan_type.storagebits = 16, \
+}
+
+static const struct iio_chan_spec iproc_adc_iio_channels[] = {
+ ADC_CHANNEL(0, "adc0"),
+ ADC_CHANNEL(1, "adc1"),
+ ADC_CHANNEL(2, "adc2"),
+ ADC_CHANNEL(3, "adc3"),
+ ADC_CHANNEL(4, "adc4"),
+ ADC_CHANNEL(5, "adc5"),
+ ADC_CHANNEL(6, "adc6"),
+ ADC_CHANNEL(7, "adc7"),
+};
+
+static int iproc_adc_probe(struct platform_device *pdev)
+{
+ struct iproc_adc_priv *adc_priv;
+ struct iio_dev *indio_dev = NULL;
+ int ret;
+
+ indio_dev = iio_device_alloc(sizeof(struct iproc_adc_priv));
+ if (!indio_dev) {
+ dev_err(&pdev->dev, "failed to allocate iio device\n");
+ return -ENOMEM;
+ }
+ adc_priv = iio_priv(indio_dev);
+ platform_set_drvdata(pdev, indio_dev);
+
+ mutex_init(&adc_priv->mutex);
+
+ init_completion(&adc_priv->completion);
+
+ adc_priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+ "adc-syscon");
+ if (IS_ERR(adc_priv->regmap)) {
+ dev_err(&pdev->dev, "failed to get handle for tsc syscon\n");
+ ret = PTR_ERR(adc_priv->regmap);
+ goto err_iio;
+ }
+
+ adc_priv->adc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
+ if (IS_ERR(adc_priv->adc_clk)) {
+ dev_err(&pdev->dev,
+ "%s Failed getting clock tsc_clk\n", __func__);
+ ret = PTR_ERR(adc_priv->adc_clk);
+ goto err_iio;
+ }
+
+ /* get interrupt */
+ adc_priv->irqno = platform_get_irq(pdev, 0);
+ if (adc_priv->irqno <= 0) {
+ dev_err(&pdev->dev, "%s platform_get_irq failed\n", __func__);
+ ret = -ENODEV;
+ goto err_iio;
+ }
+
+ regmap_update_bits(adc_priv->regmap, REGCTL2, ADC_AUXIN_SCAN_ENA, 0);
+
+ ret = devm_request_threaded_irq(&pdev->dev, adc_priv->irqno,
+ iproc_adc_interrupt_thread,
+ iproc_adc_interrupt_handler,
+ IRQF_SHARED, "iproc-adc", indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "request_irq error %d\n", ret);
+ goto err_iio;
+ }
+
+ indio_dev->name = dev_name(&pdev->dev);
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->dev.of_node = pdev->dev.of_node;
+ indio_dev->info = &iproc_adc_iio_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = iproc_adc_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(iproc_adc_iio_channels);
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "iio_device_register failed:err %d\n", ret);
+ goto err_iio;
+ }
+
+ /* Enable clock */
+ ret = clk_prepare_enable(adc_priv->adc_clk);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "%s clk_prepare_enable failed %d\n", __func__, ret);
+ goto err_iio_dev;
+ }
+ iproc_adc_enable(indio_dev);
+ return 0;
+err_iio_dev:
+ iio_device_unregister(indio_dev);
+err_iio:
+ iio_device_free(indio_dev);
+ return ret;
+}
+
+static int iproc_adc_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ clk_disable_unprepare(adc_priv->adc_clk);
+ iio_device_free(indio_dev);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static const struct of_device_id iproc_adc_of_match[] = {
+ {.compatible = "brcm,iproc-static-adc", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, iproc_adc_of_match);
+
+static struct platform_driver iproc_adc_driver = {
+ .probe = iproc_adc_probe,
+ .remove = iproc_adc_remove,
+ .driver = {
+ .name = "iproc-static-adc",
+ .of_match_table = of_match_ptr(iproc_adc_of_match),
+ },
+};
+
+
+module_platform_driver(iproc_adc_driver);
+
+MODULE_DESCRIPTION("IPROC ADC driver");
+MODULE_AUTHOR("Broadcom");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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