Basically the TI TSC2046 touchscreen controller is 8 channel ADC optimized for
the touchscreen use case. By implementing it as IIO ADC device, we can
make use of resistive-adc-touch and iio-hwmon drivers.
So far, this driver was tested with custom version of resistive-adc-touch driver,
since it need to be extended to make use of Z1 and Z2 channels. The X/Y
are working without additional changes.
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
MAINTAINERS | 8 +
drivers/iio/adc/Kconfig | 12 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ti-tsc2046.c | 652 +++++++++++++++++++++++++++++++++++
4 files changed, 673 insertions(+)
create mode 100644 drivers/iio/adc/ti-tsc2046.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3fea1a934b32..2d33c6442a55 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17852,6 +17852,14 @@ S: Supported
F: Documentation/devicetree/bindings/net/nfc/trf7970a.txt
F: drivers/nfc/trf7970a.c
+TI TSC2046 ADC DRIVER
+M: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
+R: kernel@xxxxxxxxxxxxxx
+L: linux-iio@xxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/iio/adc/ti,tsc2046.yaml
+F: drivers/iio/adc/ti-tsc2046.c
+
TI TWL4030 SERIES SOC CODEC DRIVER
M: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
L: alsa-devel@xxxxxxxxxxxxxxxx (moderated for non-subscribers)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 15587a1bc80d..6ad6f04dfd20 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1175,6 +1175,18 @@ config TI_TLC4541
This driver can also be built as a module. If so, the module will be
called ti-tlc4541.
+config TI_TSC2046
+ tristate "Texas Instruments TSC2046 ADC driver"
+ depends on SPI
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say yes here to build support for ADC functionality of Texas
+ Instruments TSC2046 touch screen controller.
+
+ This driver can also be built as a module. If so, the module will be
+ called ti-tsc2046.
+
config TWL4030_MADC
tristate "TWL4030 MADC (Monitoring A/D Converter)"
depends on TWL4030_CORE
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 5fca90ada0ec..440e18ac6780 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o
obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o
+obj-$(CONFIG_TI_TSC2046) += ti-tsc2046.o
obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
obj-$(CONFIG_TWL6030_GPADC) += twl6030-gpadc.o
obj-$(CONFIG_VF610_ADC) += vf610_adc.o
diff --git a/drivers/iio/adc/ti-tsc2046.c b/drivers/iio/adc/ti-tsc2046.c
new file mode 100644
index 000000000000..e119e7c31fa7
--- /dev/null
+++ b/drivers/iio/adc/ti-tsc2046.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments TSC2046 SPI ADC driver
+ *
+ * Copyright (c) 2021 Oleksij Rempel <kernel@xxxxxxxxxxxxxx>, Pengutronix
+ */
+
+#include <asm/unaligned.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+
+#define TI_TSC2046_NAME "tsc2046"
+
+/* this driver doesn't aim at the peak continuous sample rate */
+#define TI_TSC2046_MAX_SAMPLE_RATE 125000
+#define TI_TSC2046_SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/)
+#define TI_TSC2046_MAX_CLK_FREQ \
+ (TI_TSC2046_MAX_SAMPLE_RATE * TI_TSC2046_SAMPLE_BITS)
+
+/*
+ * Default settling time. This time depends on the:
+ * - PCB design
+ * - touch plates size, temperature, etc
+ * - initial power state of the ADC
+ *
+ * Since most values higher than 100us seems to be good, it make sense to
+ * have some default value. These values were measuring get by testing on a
+ * PLYM2M board at 2MHz SPI CLK rate.
+ *
+ * Sometimes there are extra signal filter capacitors on the touchscreen
+ * signals, which make it 10 or 100 times worse.
+ */
+#define TI_TSC2046_SETTLING_TIME_XYZ_DEF_US 700
+/* Oversampling count for the low-pass filter */
+#define TI_TSC2046_SAMPLES_XYZ_DEF 5
+/* Default sample interval */
+#define TI_TSC2046_SAMPLE_INTERVAL_US 10000
+
+#define TI_TSC2046_START BIT(7)
+#define TI_TSC2046_ADDR GENMASK(6, 4)
+#define TI_TSC2046_ADDR_TEMP1 7
+#define TI_TSC2046_ADDR_AUX 6
+#define TI_TSC2046_ADDR_X 5
+#define TI_TSC2046_ADDR_Z2 4
+#define TI_TSC2046_ADDR_Z1 3
+#define TI_TSC2046_ADDR_VBAT 2
+#define TI_TSC2046_ADDR_Y 1
+#define TI_TSC2046_ADDR_TEMP0 0
+
+/*
+ * The mode bit sets the resolution of the ADC. With this bit low, the next
+ * conversion has 12-bit resolution, whereas with this bit high, the next
+ * conversion has 8-bit resolution. This driver is optimized for 12-bit mode.
+ * So, for this driver, this bit should stay zero.
+ */
+#define TI_TSC2046_8BIT_MODE BIT(3)
+
+/*
+ * SER/DFR - The SER/DFR bit controls the reference mode, either single-ended
+ * (high) or differential (low).
+ */
+#define TI_TSC2046_SER BIT(2)
+
+/*
+ * If VREF_ON and ADC_ON are both zero, then the chip operates in
+ * auto-wake/suspend mode. In most case this bits should stay zero.
+ */
+#define TI_TSC2046_PD1_VREF_ON BIT(1)
+#define TI_TSC2046_PD0_ADC_ON BIT(0)
+
+#define TI_TSC2046_MAX_CHAN 8
+
+#define TI_TSC2046_TIMESTAMP_SIZE (sizeof(int64_t) / sizeof(int16_t))
+
+/* represents a HW sample */
+struct tsc2046_adc_atom {
+ u8 cmd;
+ __be16 data;
+} __packed;
+
+/* layout of atomic buffers within big buffer */
+struct tsc2046_adc_group_layout {
+ unsigned int offset;
+ unsigned int count;
+ unsigned int skip;
+};
+
+struct tsc2046_adc_dcfg {
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
+};
+
+struct tsc2046_adc_priv {
+ struct spi_device *spi;
+ struct iio_trigger *trig;
+ const struct tsc2046_adc_dcfg *dcfg;
+
+ struct spi_transfer xfer;
+ struct spi_message msg;
+
+ u16 scan_buf[TI_TSC2046_MAX_CHAN + 2 + TI_TSC2046_TIMESTAMP_SIZE];
+ /*
+ * Lock to protect the layout and the spi transfer buffer.
+ * tsc2046_adc_group_layout can be changed within update_scan_mode(),
+ * in this case the l[] and tx/rx buffer will be out of sync to each
+ * other.
+ */
+ struct mutex slock;
+ struct tsc2046_adc_group_layout l[TI_TSC2046_MAX_CHAN];
+ struct tsc2046_adc_atom *rx;
+ struct tsc2046_adc_atom *tx;
+
+ unsigned int count;
+ unsigned int groups;
+ u32 effective_speed_hz;
+ u32 scan_interval_us;
+ u32 time_per_scan_us;
+ u32 time_per_bit_ns;
+};
+
+#define TI_TSC2046_V_CHAN(index, bits, name) \
+{ \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = index, \
+ .address = index, \
+ .datasheet_name = "#name", \
+ .scan_index = index, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = bits, \
+ .storagebits = 16, \
+ .shift = 0, \
+ .endianness = IIO_CPU, \
+ }, \
+}
+
+#define DECLARE_TI_TSC2046_8_CHANNELS(name, bits) \
+const struct iio_chan_spec name ## _channels[] = { \
+ TI_TSC2046_V_CHAN(0, bits, TEMP0), \
+ TI_TSC2046_V_CHAN(1, bits, Y), \
+ TI_TSC2046_V_CHAN(2, bits, VBAT), \
+ TI_TSC2046_V_CHAN(3, bits, Z1), \
+ TI_TSC2046_V_CHAN(4, bits, Z2), \
+ TI_TSC2046_V_CHAN(5, bits, X), \
+ TI_TSC2046_V_CHAN(6, bits, AUX), \
+ TI_TSC2046_V_CHAN(7, bits, TEMP1), \
+ IIO_CHAN_SOFT_TIMESTAMP(8), \
+}
+
+static DECLARE_TI_TSC2046_8_CHANNELS(tsc2046_adc, 12);
+
+static const struct tsc2046_adc_dcfg tsc2046_adc_dcfg_tsc2046e = {
+ .channels = tsc2046_adc_channels,
+ .num_channels = ARRAY_SIZE(tsc2046_adc_channels),
+};
+
+/*
+ * Convert time to a number of samples which can be transferred within this
+ * time.
+ */
+static unsigned int tsc2046_adc_time_to_count(struct tsc2046_adc_priv *priv,
+ unsigned long time)
+{
+ unsigned int bit_count, sample_count;
+
+ bit_count = DIV_ROUND_UP(time * NSEC_PER_USEC, priv->time_per_bit_ns);
+ sample_count = DIV_ROUND_UP(bit_count, TI_TSC2046_SAMPLE_BITS);
+
+ dev_dbg(&priv->spi->dev, "%s effective speed %u, time per bit: %u, count bits: %u, count samples: %u\n",
+ __func__, priv->effective_speed_hz, priv->time_per_bit_ns,
+ bit_count, sample_count);
+
+ return sample_count;
+}
+
+/*
+ * In case this ADC is attached to a touchscreen, some channels will need more
+ * time to provide usable data than other channels.
+ */
+static unsigned int tsc2046_adc_get_settle_count(struct tsc2046_adc_priv *priv,
+ int ch_idx)
+{
+ u32 settle_time;
+
+ switch (ch_idx) {
+ case TI_TSC2046_ADDR_X:
+ case TI_TSC2046_ADDR_Y:
+ case TI_TSC2046_ADDR_Z1:
+ case TI_TSC2046_ADDR_Z2:
+ settle_time = TI_TSC2046_SETTLING_TIME_XYZ_DEF_US;
+ break;
+ default:
+ settle_time = 0;
+ }
+
+ return tsc2046_adc_time_to_count(priv, settle_time);
+}
+
+static u8 tsc2046_adc_get_cmd(struct tsc2046_adc_priv *priv, int ch_idx,
+ bool keep_power)
+{
+ u32 pd = 0; /* power down (pd) bits */
+
+ /*
+ * if PD bits are 0, controller will automatically disable ADC, VREF and
+ * enable IRQ.
+ */
+ if (keep_power)
+ pd = TI_TSC2046_PD0_ADC_ON;
+
+ return TI_TSC2046_START | FIELD_PREP(TI_TSC2046_ADDR, ch_idx) | pd;
+}
+
+static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
+{
+ /* last 3 bits on the wire are empty */
+ return get_unaligned_be16(&buf->data) >> 3;
+}
+
+static int tsc2046_adc_read_one(struct tsc2046_adc_priv *priv, int ch_idx,
+ u32 *effective_speed_hz)
+{
+ struct tsc2046_adc_atom tx_buf, rx_buf;
+ struct spi_transfer xfer;
+ struct spi_message msg;
+ int ret;
+
+ memset(&xfer, 0, sizeof(xfer));
+ tx_buf.cmd = tsc2046_adc_get_cmd(priv, ch_idx, false);
+ tx_buf.data = 0;
+ xfer.tx_buf = &tx_buf;
+ xfer.rx_buf = &rx_buf;
+ xfer.len = sizeof(tx_buf);
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ ret = spi_sync(priv->spi, &msg);
+ if (ret) {
+ dev_err_ratelimited(&priv->spi->dev, "%s: SPI transfer filed %pe\n",
+ __func__, ERR_PTR(ret));
+ return ret;
+ }
+
+ if (effective_speed_hz)
+ *effective_speed_hz = xfer.effective_speed_hz;
+
+ return tsc2046_adc_get_value(&rx_buf);
+}
+
+static size_t tsc2046_adc_group_set_layout(struct tsc2046_adc_priv *priv,
+ unsigned int group,
+ unsigned int ch_idx)
+{
+ struct tsc2046_adc_group_layout *l = &priv->l[group];
+ unsigned int max_count, count_skip;
+ unsigned int offset = 0;
+
+ count_skip = tsc2046_adc_get_settle_count(priv, ch_idx);
+
+ if (group != 0) {
+ l = &priv->l[group - 1];
+ offset = l->offset + l->count;
+ }
+
+ l = &priv->l[group];
+
+ max_count = count_skip + TI_TSC2046_SAMPLES_XYZ_DEF;
+
+ l->offset = offset;
+ l->count = max_count;
+ l->skip = count_skip;
+
+ return sizeof(*priv->tx) * max_count;
+}
+
+static void tsc2046_adc_group_set_cmd(struct tsc2046_adc_priv *priv,
+ unsigned int group, int ch_idx)
+{
+ struct tsc2046_adc_group_layout *l = &priv->l[group];
+ unsigned int i;
+ u8 cmd;
+
+ /*
+ * Do not enable automatic power down on working samples. Otherwise the
+ * plates will never be completely charged.
+ */
+ cmd = tsc2046_adc_get_cmd(priv, ch_idx, true);
+
+ for (i = 0; i < l->count - 1; i++)
+ priv->tx[l->offset + i].cmd = cmd;
+
+ /* automatically power down on last sample */
+ priv->tx[l->offset + i].cmd = tsc2046_adc_get_cmd(priv, ch_idx, false);
+}
+
+static int tsc2046_adc_get_valide_val(struct tsc2046_adc_priv *priv,
+ int group)
+{
+ struct tsc2046_adc_group_layout *l;
+ struct tsc2046_adc_atom *tx;
+ int ch_idx, valid_count, i;
+ unsigned int val, val_normalized = 0;
+
+ l = &priv->l[group];
+ tx = &priv->tx[l->offset + l->skip];
+ ch_idx = FIELD_GET(TI_TSC2046_ADDR, tx->cmd);
+
+ valid_count = l->count - l->skip;
+ for (i = 0; i < valid_count; i++) {
+ val = tsc2046_adc_get_value(&priv->rx[l->offset + l->skip + i]);
+ /*
+ * Following values are possible only if touch is not in active
+ * state. No pressure on plates.
+ */
+ switch (ch_idx) {
+ case TI_TSC2046_ADDR_Y:
+ if (val == 0xfff)
+ return -EAGAIN;
+ break;
+ case TI_TSC2046_ADDR_X:
+ if (!val)
+ return -EAGAIN;
+ break;
+ }
+
+ val_normalized += val;
+ }
+
+ return DIV_ROUND_UP(val_normalized, valid_count);
+}
+
+static int tsc2046_adc_scan(struct iio_dev *indio_dev)
+{
+ struct tsc2046_adc_priv *priv = iio_priv(indio_dev);
+ struct device *dev = &priv->spi->dev;
+ bool valid = true;
+ int group;
+ int ret;
+
+ ret = spi_sync(priv->spi, &priv->msg);
+ if (ret < 0) {
+ dev_err_ratelimited(dev, "%s: SPI transfer filed: %pe\n",
+ __func__, ERR_PTR(ret));
+ return ret;
+ }
+
+ for (group = 0; group < priv->groups; group++) {
+ if (valid) {
+ /*
+ * Validate data to stop sampling and reduce power
+ * consumption.
+ */
+ ret = tsc2046_adc_get_valide_val(priv, group);
+ if (ret < 0) {
+ /* go back and invalidate all channels */
+ group = 0;
+ valid = false;
+ }
+ } else {
+ ret = 0xffff;
+ }
+
+ priv->scan_buf[group] = ret;
+ }
+
+ ret = iio_push_to_buffers_with_timestamp(indio_dev, &priv->scan_buf,
+ iio_get_time_ns(indio_dev));
+ /*
+ * If there's no consumer (or consumer is too slow), we'll get a EBUSY
+ * here - ignore it.
+ */
+ if (ret < 0 && ret != -EBUSY) {
+ dev_err_ratelimited(dev, "%s: Filed to push scan buffer %pe\n",
+ __func__, ERR_PTR(ret));
+
+ return ret;
+ }
+
+ return valid ? 0 : -EAGAIN;
+}
+
+static irqreturn_t tsc2046_adc_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct tsc2046_adc_priv *priv = iio_priv(indio_dev);
+ unsigned int retry = 3;
+
+ do {
+ int ret, delta;
+
+ mutex_lock(&priv->slock);
+ ret = tsc2046_adc_scan(indio_dev);
+ mutex_unlock(&priv->slock);
+ if (ret)
+ goto done;
+
+ /*
+ * We can sample it as fast as we can, but usually we do not
+ * need so many samples. Reduce the sample rate for default
+ * (touchscreen) use case.
+ * Currently we do not need highly precise sample rate. It
+ * is enough to have calculated numbers.
+ */
+ delta = priv->scan_interval_us - priv->time_per_scan_us;
+ if (delta > 0)
+ fsleep(delta);
+ } while (retry--);
+
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int tsc2046_adc_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *active_scan_mask)
+{
+ struct tsc2046_adc_priv *priv = iio_priv(indio_dev);
+ unsigned int ch_idx, group = 0;
+ size_t size = 0;
+
+ mutex_lock(&priv->slock);
+
+ for_each_set_bit(ch_idx, active_scan_mask, indio_dev->num_channels) {
+ size += tsc2046_adc_group_set_layout(priv, group, ch_idx);
+ tsc2046_adc_group_set_cmd(priv, group, ch_idx);
+ group++;
+ }
+
+ priv->groups = group;
+ priv->xfer.len = size;
+ priv->time_per_scan_us = size * 8 *
+ priv->time_per_bit_ns / NSEC_PER_USEC;
+
+ if ((priv->scan_interval_us - priv->time_per_scan_us) < 0)
+ dev_warn(&priv->spi->dev, "The scan interval (%d) is less then calculated scan time (%d)\n",
+ priv->scan_interval_us, priv->time_per_scan_us);
+
+ mutex_unlock(&priv->slock);
+
+ return 0;
+}
+
+static const struct iio_info tsc2046_adc_info = {
+ .update_scan_mode = tsc2046_adc_update_scan_mode,
+};
+
+static irqreturn_t tsc2046_adc_irq(int irq, void *dev_id)
+{
+ struct iio_dev *indio_dev = dev_id;
+ struct tsc2046_adc_priv *priv = iio_priv(indio_dev);
+
+ iio_trigger_poll_chained(priv->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int tsc2046_adc_set_trigger_state(struct iio_trigger *trig, bool enable)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct tsc2046_adc_priv *priv = iio_priv(indio_dev);
+
+ if (enable)
+ enable_irq(priv->spi->irq);
+ else
+ disable_irq(priv->spi->irq);
+
+ return 0;
+}
+
+static const struct iio_trigger_ops tsc2046_adc_trigger_ops = {
+ .set_trigger_state = tsc2046_adc_set_trigger_state,
+};
+
+static int tsc2046_adc_setup_spi_msg(struct tsc2046_adc_priv *priv)
+{
+ unsigned int ch_idx;
+ size_t size = 0;
+ int ret;
+
+ /*
+ * Make dummy read to set initial power state and get real SPI clock
+ * freq. It seems to be not important which channel is used for this
+ * case.
+ */
+ ret = tsc2046_adc_read_one(priv, TI_TSC2046_ADDR_TEMP0,
+ &priv->effective_speed_hz);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * In case SPI controller do not report effective_speed_hz, use
+ * configure value and hope it will match
+ */
+ if (!priv->effective_speed_hz)
+ priv->effective_speed_hz = priv->spi->max_speed_hz;
+
+
+ priv->scan_interval_us = TI_TSC2046_SAMPLE_INTERVAL_US;
+ priv->time_per_bit_ns = DIV_ROUND_UP(NSEC_PER_SEC,
+ priv->effective_speed_hz);
+
+ /*
+ * calculate and allocate maximal size buffer if all channels are
+ * enabled
+ */
+ for (ch_idx = 0; ch_idx < priv->dcfg->num_channels; ch_idx++)
+ size += tsc2046_adc_group_set_layout(priv, ch_idx, ch_idx);
+
+ priv->tx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL);
+ if (!priv->tx)
+ return -ENOMEM;
+
+ priv->rx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL);
+ if (!priv->rx)
+ return -ENOMEM;
+
+ spi_message_init(&priv->msg);
+ priv->msg.context = priv;
+
+ priv->xfer.tx_buf = priv->tx;
+ priv->xfer.rx_buf = priv->rx;
+ priv->xfer.len = size;
+ spi_message_add_tail(&priv->xfer, &priv->msg);
+
+ return 0;
+}
+
+static int tsc2046_adc_probe(struct spi_device *spi)
+{
+ const struct tsc2046_adc_dcfg *dcfg;
+ struct device *dev = &spi->dev;
+ struct tsc2046_adc_priv *priv;
+ struct iio_dev *indio_dev;
+ struct iio_trigger *trig;
+ const char *name;
+ int ret;
+
+ /* don't exceed max specified sample rate */
+ if (spi->max_speed_hz > TI_TSC2046_MAX_CLK_FREQ) {
+ dev_err(dev, "SPI max_speed_hz is too high: %d Hz. Max supported freq is %d Hz\n",
+ spi->max_speed_hz, TI_TSC2046_MAX_CLK_FREQ);
+ return -EINVAL;
+ }
+
+ dcfg = device_get_match_data(dev);
+ if (!dcfg)
+ return -EINVAL;
+
+ spi->bits_per_word = 8;
+ spi->mode &= ~SPI_MODE_X_MASK;
+ spi->mode |= SPI_MODE_0;
+ ret = spi_setup(spi);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Error in spi setup\n");
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ priv = iio_priv(indio_dev);
+ priv->dcfg = dcfg;
+
+ spi_set_drvdata(spi, indio_dev);
+
+ priv->spi = spi;
+
+ name = devm_kasprintf(dev, GFP_KERNEL, "%s-%s",
+ TI_TSC2046_NAME, dev_name(dev));
+
+ indio_dev->name = name;
+ indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;
+ indio_dev->channels = dcfg->channels;
+ indio_dev->num_channels = dcfg->num_channels;
+ indio_dev->info = &tsc2046_adc_info;
+
+ ret = tsc2046_adc_setup_spi_msg(priv);
+ if (ret)
+ return ret;
+
+ mutex_init(&priv->slock);
+
+ /* TODO: remove IRQ_NOAUTOEN after needed patches are mainline */
+ irq_set_status_flags(spi->irq, IRQ_NOAUTOEN);
+ ret = devm_request_threaded_irq(dev, spi->irq,
+ NULL,
+ &tsc2046_adc_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ name, indio_dev);
+ if (ret)
+ return ret;
+
+ trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+ if (!trig)
+ return -ENOMEM;
+
+ priv->trig = trig;
+ trig->dev.parent = indio_dev->dev.parent;
+ iio_trigger_set_drvdata(trig, indio_dev);
+ trig->ops = &tsc2046_adc_trigger_ops;
+
+ ret = devm_iio_trigger_register(dev, trig);
+ if (ret) {
+ dev_err(dev, "failed to register trigger\n");
+ return ret;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+ &tsc2046_adc_trigger_handler, NULL);
+ if (ret) {
+ dev_err(dev, "Failed to setup triggered buffer\n");
+ return ret;
+ }
+
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret) {
+ dev_err(dev, "Failed to register iio device\n");
+ return ret;
+ }
+
+ /* set default trigger */
+ indio_dev->trig = iio_trigger_get(priv->trig);
+ return 0;
+}
+
+static const struct of_device_id ads7950_of_table[] = {
+ { .compatible = "ti,tsc2046e-adc", .data = &tsc2046_adc_dcfg_tsc2046e },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ads7950_of_table);
+
+static struct spi_driver tsc2046_adc_driver = {
+ .driver = {
+ .name = "tsc2046",
+ .of_match_table = ads7950_of_table,
+ },
+ .probe = tsc2046_adc_probe,
+};
+module_spi_driver(tsc2046_adc_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <kernel@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("TI TSC2046 ADC");
+MODULE_LICENSE("GPL v2");
--
2.29.2
