Hi,
GE Healthcare's PPD [0] uses DA9053's touchscreen pins
for hardware monitoring purposes. This adds support for
the feature and fixes a bug, which came up during
stress-testing of the driver.
[0] https://patchwork.kernel.org/patch/9809681/
-- Sebastian
Sebastian Reichel (2):
mfd: da9052: fix manual ADC read after timed out read
hwmon: da9052: add support for TSI channel
.../devicetree/bindings/mfd/da9052-i2c.txt | 8 +
drivers/hwmon/da9052-hwmon.c | 229 ++++++++++++++++++++-
drivers/input/touchscreen/da9052_tsi.c | 5 +
drivers/mfd/da9052-core.c | 2 +
include/linux/mfd/da9052/da9052.h | 6 +
5 files changed, 246 insertions(+), 4 deletions(-)
--
2.11.0
It is possible that under heavy system load, the counter in the completion
struct, used for waiting for end of AD conversion, gets incremented twice.
To make sure the driver recovers from this situation, the completion struct
should be reinitialized.
Signed-off-by: Sebastian Reichel <[email protected]>
---
drivers/mfd/da9052-core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
index a88c2065d8ab..977418ca9117 100644
--- a/drivers/mfd/da9052-core.c
+++ b/drivers/mfd/da9052-core.c
@@ -386,6 +386,8 @@ int da9052_adc_manual_read(struct da9052 *da9052, unsigned char channel)
mutex_lock(&da9052->auxadc_lock);
+ reinit_completion(&da9052->done);
+
/* Channel gets activated on enabling the Conversion bit */
mux_sel = chan_mux[channel] | DA9052_ADC_MAN_MAN_CONV;
--
2.11.0
TSI channel has a 4 channel mux connected to it and is normally
used for touchscreen support. The hardware may alternatively
use it as general purpose adc.
Signed-off-by: Sebastian Reichel <[email protected]>
---
.../devicetree/bindings/mfd/da9052-i2c.txt | 8 +
drivers/hwmon/da9052-hwmon.c | 229 ++++++++++++++++++++-
drivers/input/touchscreen/da9052_tsi.c | 5 +
include/linux/mfd/da9052/da9052.h | 6 +
4 files changed, 244 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
index 9554292dc6cb..94f3bb1d9a0a 100644
--- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
+++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
@@ -4,6 +4,14 @@ Required properties:
- compatible : Should be "dlg,da9052", "dlg,da9053-aa",
"dlg,da9053-ab", or "dlg,da9053-bb"
+Optional properties:
+- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen
+ input lines are used as general purpose analogue
+ input.
+- diag,tsiref-microvolt: Voltage applied to the TSIREF pin, which is
+ used as reference voltage when reading TSI
+ pins as ADC. Defaults to 2500000.
+
Sub-nodes:
- regulators : Contain the regulator nodes. The DA9052/53 regulators are
bound using their names as listed below:
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
index c9832bfacfe5..a0b9d5498ba4 100644
--- a/drivers/hwmon/da9052-hwmon.c
+++ b/drivers/hwmon/da9052-hwmon.c
@@ -20,13 +20,17 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
+#include <linux/property.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
struct da9052_hwmon {
- struct da9052 *da9052;
- struct mutex hwmon_lock;
+ struct da9052 *da9052;
+ struct mutex hwmon_lock;
+ bool tsi_as_adc;
+ int tsiref_mv;
+ struct completion tsidone;
};
static const char * const input_names[] = {
@@ -37,6 +41,10 @@ static const char * const input_names[] = {
[DA9052_ADC_IN4] = "ADC IN4",
[DA9052_ADC_IN5] = "ADC IN5",
[DA9052_ADC_IN6] = "ADC IN6",
+ [DA9052_ADC_TSI_XP] = "ADC TS X+",
+ [DA9052_ADC_TSI_YP] = "ADC TS Y+",
+ [DA9052_ADC_TSI_XN] = "ADC TS X-",
+ [DA9052_ADC_TSI_YN] = "ADC TS Y-",
[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
};
@@ -59,6 +67,11 @@ static inline int vbbat_reg_to_mv(int value)
return DIV_ROUND_CLOSEST(value * 5000, 1023);
}
+static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
+{
+ return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
+}
+
static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
{
return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
@@ -154,6 +167,103 @@ static ssize_t da9052_read_misc_channel(struct device *dev,
return sprintf(buf, "%d\n", input_reg_to_mv(ret));
}
+static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
+{
+ u8 val = BIT(6); /* TSI_MAN */
+
+ switch (channel) {
+ case DA9052_ADC_TSI_XP:
+ val |= (0 << 4); /* TSI_MUX */
+ break;
+ case DA9052_ADC_TSI_YP:
+ val |= (1 << 4); /* TSI_MUX */
+ break;
+ case DA9052_ADC_TSI_XN:
+ val |= (2 << 4); /* TSI_MUX */
+ break;
+ case DA9052_ADC_TSI_YN:
+ val |= (3 << 4); /* TSI_MUX */
+ break;
+ }
+
+ return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
+}
+
+static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
+{
+ int msb, lsb;
+
+ switch (channel) {
+ case DA9052_ADC_TSI_XP:
+ case DA9052_ADC_TSI_XN:
+ msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG);
+ if (msb < 0)
+ return msb;
+
+ lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
+ if (lsb < 0)
+ return lsb;
+
+ break;
+ case DA9052_ADC_TSI_YP:
+ case DA9052_ADC_TSI_YN:
+ msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG);
+ if (msb < 0)
+ return msb;
+
+ lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
+ if (lsb < 0)
+ return lsb;
+ lsb >>= 2;
+
+ break;
+ default:
+ return -ENXIO;
+ }
+
+ return (msb << 2) | (lsb & 0x3);
+}
+
+
+static ssize_t __da9052_read_tsi(struct device *dev, int channel)
+{
+ struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+ int ret;
+
+ reinit_completion(&hwmon->tsidone);
+
+ ret = da9052_request_tsi_read(hwmon, channel);
+ if (ret < 0)
+ return ret;
+
+ /* Wait for an conversion done interrupt */
+ if (!wait_for_completion_timeout(&hwmon->tsidone,
+ msecs_to_jiffies(500))) {
+ dev_err(dev, "timeout waiting for TSI conversion interrupt\n");
+ return -ETIMEDOUT;
+ }
+
+ return da9052_get_tsi_result(hwmon, channel);
+}
+
+static ssize_t da9052_read_tsi(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+ int channel = to_sensor_dev_attr(devattr)->index;
+ int ret;
+
+ mutex_lock(&hwmon->hwmon_lock);
+ ret = __da9052_read_tsi(dev, channel);
+ mutex_unlock(&hwmon->hwmon_lock);
+
+ if (ret < 0)
+ return ret;
+ else
+ return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
+}
+
static ssize_t da9052_read_tjunc(struct device *dev,
struct device_attribute *devattr, char *buf)
{
@@ -196,6 +306,28 @@ static ssize_t show_label(struct device *dev,
input_names[to_sensor_dev_attr(devattr)->index]);
}
+static umode_t da9052_channel_is_visible(struct kobject *kobj,
+ struct attribute *a, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+
+ switch (index) {
+ case DA9052_ADC_TSI_XP:
+ case DA9052_ADC_TSI_YP:
+ case DA9052_ADC_TSI_XN:
+ case DA9052_ADC_TSI_YN:
+ break;
+ default:
+ return a->mode;
+ }
+
+ if (!hwmon->tsi_as_adc)
+ return 0;
+
+ return a->mode;
+}
+
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
DA9052_ADC_VDDOUT);
static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
@@ -221,6 +353,23 @@ static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
DA9052_ADC_VBBAT);
+static SENSOR_DEVICE_ATTR(in70_input, S_IRUGO, da9052_read_tsi, NULL,
+ DA9052_ADC_TSI_XP);
+static SENSOR_DEVICE_ATTR(in70_label, S_IRUGO, show_label, NULL,
+ DA9052_ADC_TSI_XP);
+static SENSOR_DEVICE_ATTR(in71_input, S_IRUGO, da9052_read_tsi, NULL,
+ DA9052_ADC_TSI_XN);
+static SENSOR_DEVICE_ATTR(in71_label, S_IRUGO, show_label, NULL,
+ DA9052_ADC_TSI_XN);
+static SENSOR_DEVICE_ATTR(in72_input, S_IRUGO, da9052_read_tsi, NULL,
+ DA9052_ADC_TSI_YP);
+static SENSOR_DEVICE_ATTR(in72_label, S_IRUGO, show_label, NULL,
+ DA9052_ADC_TSI_YP);
+static SENSOR_DEVICE_ATTR(in73_input, S_IRUGO, da9052_read_tsi, NULL,
+ DA9052_ADC_TSI_YN);
+static SENSOR_DEVICE_ATTR(in73_label, S_IRUGO, show_label, NULL,
+ DA9052_ADC_TSI_YN);
+
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
@@ -246,6 +395,14 @@ static struct attribute *da9052_attrs[] = {
&sensor_dev_attr_in5_label.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in6_label.dev_attr.attr,
+ &sensor_dev_attr_in70_input.dev_attr.attr,
+ &sensor_dev_attr_in70_label.dev_attr.attr,
+ &sensor_dev_attr_in71_input.dev_attr.attr,
+ &sensor_dev_attr_in71_label.dev_attr.attr,
+ &sensor_dev_attr_in72_input.dev_attr.attr,
+ &sensor_dev_attr_in72_label.dev_attr.attr,
+ &sensor_dev_attr_in73_input.dev_attr.attr,
+ &sensor_dev_attr_in73_label.dev_attr.attr,
&sensor_dev_attr_in9_input.dev_attr.attr,
&sensor_dev_attr_in9_label.dev_attr.attr,
&sensor_dev_attr_curr1_input.dev_attr.attr,
@@ -257,29 +414,93 @@ static struct attribute *da9052_attrs[] = {
NULL
};
-ATTRIBUTE_GROUPS(da9052);
+static const struct attribute_group da9052_group = {
+ .attrs = da9052_attrs,
+ .is_visible = da9052_channel_is_visible,
+};
+__ATTRIBUTE_GROUPS(da9052);
+
+static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
+{
+ struct da9052_hwmon *hwmon = data;
+ complete(&hwmon->tsidone);
+ return IRQ_HANDLED;
+}
static int da9052_hwmon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct da9052_hwmon *hwmon;
struct device *hwmon_dev;
+ int err;
hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
+ platform_set_drvdata(pdev, hwmon);
+
mutex_init(&hwmon->hwmon_lock);
hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
+ init_completion(&hwmon->tsidone);
+
+ hwmon->tsi_as_adc =
+ device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc");
+
+ /* get tsiref from DT, default to 2.5 Volt (typ. value in datasheet) */
+ hwmon->tsiref_mv = 2500000;
+ device_property_read_u32(pdev->dev.parent, "diag,tsiref-microvolt",
+ &hwmon->tsiref_mv);
+
+ /* convert from microvolt (DT) to millivolt (hwmon) */
+ hwmon->tsiref_mv /= 1000;
+
+ /* TSIREF must be between 1.8 and 2.6 Volt according to datasheet */
+ if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
+ dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d\n",
+ hwmon->tsiref_mv);
+ return -ENXIO;
+ }
+
+ if (hwmon->tsi_as_adc) {
+ /* disable touchscreen features */
+ da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
+
+ err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
+ "tsiready-irq", da9052_tsi_datardy_irq,
+ hwmon);
+ if (err) {
+ dev_err(hwmon->da9052->dev,
+ "Failed to register TSIRDY IRQ: %d\n", err);
+ return err;
+ }
+ }
+
hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
hwmon,
da9052_groups);
- return PTR_ERR_OR_ZERO(hwmon_dev);
+ err = PTR_ERR_OR_ZERO(hwmon_dev);
+ if (err) {
+ if (hwmon->tsi_as_adc)
+ da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
+ return err;
+ }
+
+ return 0;
+}
+
+static int da9052_hwmon_remove(struct platform_device *pdev)
+{
+ struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
+ if (hwmon->tsi_as_adc)
+ da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
+ return 0;
}
static struct platform_driver da9052_hwmon_driver = {
.probe = da9052_hwmon_probe,
+ .remove = da9052_hwmon_remove,
.driver = {
.name = "da9052-hwmon",
},
diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
index 5a013bb7bcad..f0cb239546a9 100644
--- a/drivers/input/touchscreen/da9052_tsi.c
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -16,6 +16,7 @@
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
+#include <linux/property.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
@@ -238,6 +239,10 @@ static int da9052_ts_probe(struct platform_device *pdev)
if (!da9052)
return -EINVAL;
+ /* check if pins are used as general purpose ADC input */
+ if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"))
+ return -ENODEV;
+
tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
input_dev = input_allocate_device();
if (!tsi || !input_dev) {
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index ce9230af09c2..ae5b663836d0 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -45,6 +45,12 @@
#define DA9052_ADC_TJUNC 8
#define DA9052_ADC_VBBAT 9
+/* TSI channel has its own 4 channel mux */
+#define DA9052_ADC_TSI_XP 70
+#define DA9052_ADC_TSI_XN 71
+#define DA9052_ADC_TSI_YP 72
+#define DA9052_ADC_TSI_YN 73
+
#define DA9052_IRQ_DCIN 0
#define DA9052_IRQ_VBUS 1
#define DA9052_IRQ_DCINREM 2
--
2.11.0
On Mon, Jun 26, 2017 at 04:48:32PM +0200, Sebastian Reichel wrote:
> TSI channel has a 4 channel mux connected to it and is normally
> used for touchscreen support. The hardware may alternatively
> use it as general purpose adc.
>
> Signed-off-by: Sebastian Reichel <[email protected]>
> ---
> .../devicetree/bindings/mfd/da9052-i2c.txt | 8 +
> drivers/hwmon/da9052-hwmon.c | 229 ++++++++++++++++++++-
> drivers/input/touchscreen/da9052_tsi.c | 5 +
> include/linux/mfd/da9052/da9052.h | 6 +
> 4 files changed, 244 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> index 9554292dc6cb..94f3bb1d9a0a 100644
> --- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> +++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> @@ -4,6 +4,14 @@ Required properties:
> - compatible : Should be "dlg,da9052", "dlg,da9053-aa",
> "dlg,da9053-ab", or "dlg,da9053-bb"
>
> +Optional properties:
> +- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen
> + input lines are used as general purpose analogue
> + input.
> +- diag,tsiref-microvolt: Voltage applied to the TSIREF pin, which is
> + used as reference voltage when reading TSI
> + pins as ADC. Defaults to 2500000.
Wouldn't it be better to handle this using a regulator ?
> +
> Sub-nodes:
> - regulators : Contain the regulator nodes. The DA9052/53 regulators are
> bound using their names as listed below:
> diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
> index c9832bfacfe5..a0b9d5498ba4 100644
> --- a/drivers/hwmon/da9052-hwmon.c
> +++ b/drivers/hwmon/da9052-hwmon.c
> @@ -20,13 +20,17 @@
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/platform_device.h>
> +#include <linux/property.h>
>
> #include <linux/mfd/da9052/da9052.h>
> #include <linux/mfd/da9052/reg.h>
>
> struct da9052_hwmon {
> - struct da9052 *da9052;
> - struct mutex hwmon_lock;
> + struct da9052 *da9052;
> + struct mutex hwmon_lock;
> + bool tsi_as_adc;
> + int tsiref_mv;
> + struct completion tsidone;
> };
>
> static const char * const input_names[] = {
> @@ -37,6 +41,10 @@ static const char * const input_names[] = {
> [DA9052_ADC_IN4] = "ADC IN4",
> [DA9052_ADC_IN5] = "ADC IN5",
> [DA9052_ADC_IN6] = "ADC IN6",
> + [DA9052_ADC_TSI_XP] = "ADC TS X+",
> + [DA9052_ADC_TSI_YP] = "ADC TS Y+",
> + [DA9052_ADC_TSI_XN] = "ADC TS X-",
> + [DA9052_ADC_TSI_YN] = "ADC TS Y-",
> [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
> [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
> };
> @@ -59,6 +67,11 @@ static inline int vbbat_reg_to_mv(int value)
> return DIV_ROUND_CLOSEST(value * 5000, 1023);
> }
>
> +static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
> +{
> + return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
> +}
> +
> static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
> {
> return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
> @@ -154,6 +167,103 @@ static ssize_t da9052_read_misc_channel(struct device *dev,
> return sprintf(buf, "%d\n", input_reg_to_mv(ret));
> }
>
> +static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
> +{
> + u8 val = BIT(6); /* TSI_MAN */
> +
> + switch (channel) {
> + case DA9052_ADC_TSI_XP:
> + val |= (0 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_YP:
> + val |= (1 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_XN:
> + val |= (2 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_YN:
> + val |= (3 << 4); /* TSI_MUX */
> + break;
> + }
> +
> + return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
> +}
> +
> +static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
> +{
> + int msb, lsb;
> +
> + switch (channel) {
> + case DA9052_ADC_TSI_XP:
> + case DA9052_ADC_TSI_XN:
> + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG);
> + if (msb < 0)
> + return msb;
> +
> + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> + if (lsb < 0)
> + return lsb;
> +
> + break;
> + case DA9052_ADC_TSI_YP:
> + case DA9052_ADC_TSI_YN:
> + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG);
> + if (msb < 0)
> + return msb;
> +
> + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> + if (lsb < 0)
> + return lsb;
> + lsb >>= 2;
> +
> + break;
> + default:
> + return -ENXIO;
> + }
> +
> + return (msb << 2) | (lsb & 0x3);
> +}
> +
> +
> +static ssize_t __da9052_read_tsi(struct device *dev, int channel)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + reinit_completion(&hwmon->tsidone);
> +
> + ret = da9052_request_tsi_read(hwmon, channel);
> + if (ret < 0)
> + return ret;
> +
> + /* Wait for an conversion done interrupt */
> + if (!wait_for_completion_timeout(&hwmon->tsidone,
> + msecs_to_jiffies(500))) {
> + dev_err(dev, "timeout waiting for TSI conversion interrupt\n");
Is that necessary ? After all, it is reported as -ETIMEOUT.
> + return -ETIMEDOUT;
> + }
> +
> + return da9052_get_tsi_result(hwmon, channel);
> +}
> +
> +static ssize_t da9052_read_tsi(struct device *dev,
> + struct device_attribute *devattr,
> + char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int channel = to_sensor_dev_attr(devattr)->index;
> + int ret;
> +
> + mutex_lock(&hwmon->hwmon_lock);
> + ret = __da9052_read_tsi(dev, channel);
> + mutex_unlock(&hwmon->hwmon_lock);
> +
> + if (ret < 0)
> + return ret;
> + else
> + return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
> +}
> +
> static ssize_t da9052_read_tjunc(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> @@ -196,6 +306,28 @@ static ssize_t show_label(struct device *dev,
> input_names[to_sensor_dev_attr(devattr)->index]);
> }
>
> +static umode_t da9052_channel_is_visible(struct kobject *kobj,
> + struct attribute *a, int index)
> +{
> + struct device *dev = container_of(kobj, struct device, kobj);
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> +
> + switch (index) {
> + case DA9052_ADC_TSI_XP:
> + case DA9052_ADC_TSI_YP:
> + case DA9052_ADC_TSI_XN:
> + case DA9052_ADC_TSI_YN:
> + break;
> + default:
> + return a->mode;
> + }
> +
> + if (!hwmon->tsi_as_adc)
> + return 0;
Moving this into the case statement and using break;
in default: would simplify the code and make it a bit easier to read.
> +
> + return a->mode;
> +}
> +
> static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
> DA9052_ADC_VDDOUT);
> static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
> @@ -221,6 +353,23 @@ static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
> static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
> DA9052_ADC_VBBAT);
>
> +static SENSOR_DEVICE_ATTR(in70_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in70_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in71_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in71_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in72_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in72_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in73_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_YN);
> +static SENSOR_DEVICE_ATTR(in73_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_YN);
> +
> static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
> DA9052_ADC_ICH);
> static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
> @@ -246,6 +395,14 @@ static struct attribute *da9052_attrs[] = {
> &sensor_dev_attr_in5_label.dev_attr.attr,
> &sensor_dev_attr_in6_input.dev_attr.attr,
> &sensor_dev_attr_in6_label.dev_attr.attr,
> + &sensor_dev_attr_in70_input.dev_attr.attr,
> + &sensor_dev_attr_in70_label.dev_attr.attr,
> + &sensor_dev_attr_in71_input.dev_attr.attr,
> + &sensor_dev_attr_in71_label.dev_attr.attr,
> + &sensor_dev_attr_in72_input.dev_attr.attr,
> + &sensor_dev_attr_in72_label.dev_attr.attr,
> + &sensor_dev_attr_in73_input.dev_attr.attr,
> + &sensor_dev_attr_in73_label.dev_attr.attr,
> &sensor_dev_attr_in9_input.dev_attr.attr,
> &sensor_dev_attr_in9_label.dev_attr.attr,
> &sensor_dev_attr_curr1_input.dev_attr.attr,
> @@ -257,29 +414,93 @@ static struct attribute *da9052_attrs[] = {
> NULL
> };
>
> -ATTRIBUTE_GROUPS(da9052);
> +static const struct attribute_group da9052_group = {
> + .attrs = da9052_attrs,
> + .is_visible = da9052_channel_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(da9052);
> +
> +static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
> +{
> + struct da9052_hwmon *hwmon = data;
Please make sure that there are no checkpatch warnings or errors.
I am quite sure here is one.
> + complete(&hwmon->tsidone);
> + return IRQ_HANDLED;
> +}
>
> static int da9052_hwmon_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct da9052_hwmon *hwmon;
> struct device *hwmon_dev;
> + int err;
>
> hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
> if (!hwmon)
> return -ENOMEM;
>
> + platform_set_drvdata(pdev, hwmon);
> +
> mutex_init(&hwmon->hwmon_lock);
> hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
>
> + init_completion(&hwmon->tsidone);
> +
> + hwmon->tsi_as_adc =
> + device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc");
> +
> + /* get tsiref from DT, default to 2.5 Volt (typ. value in datasheet) */
> + hwmon->tsiref_mv = 2500000;
> + device_property_read_u32(pdev->dev.parent, "diag,tsiref-microvolt",
> + &hwmon->tsiref_mv);
> +
> + /* convert from microvolt (DT) to millivolt (hwmon) */
> + hwmon->tsiref_mv /= 1000;
> +
> + /* TSIREF must be between 1.8 and 2.6 Volt according to datasheet */
> + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
> + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d\n",
> + hwmon->tsiref_mv);
> + return -ENXIO;
> + }
> +
> + if (hwmon->tsi_as_adc) {
> + /* disable touchscreen features */
> + da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
> +
> + err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
> + "tsiready-irq", da9052_tsi_datardy_irq,
> + hwmon);
> + if (err) {
> + dev_err(hwmon->da9052->dev,
> + "Failed to register TSIRDY IRQ: %d\n", err);
> + return err;
> + }
> + }
> +
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
> hwmon,
> da9052_groups);
> - return PTR_ERR_OR_ZERO(hwmon_dev);
> + err = PTR_ERR_OR_ZERO(hwmon_dev);
> + if (err) {
> + if (hwmon->tsi_as_adc)
> + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int da9052_hwmon_remove(struct platform_device *pdev)
> +{
> + struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
> + if (hwmon->tsi_as_adc)
> + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> + return 0;
> }
>
> static struct platform_driver da9052_hwmon_driver = {
> .probe = da9052_hwmon_probe,
> + .remove = da9052_hwmon_remove,
> .driver = {
> .name = "da9052-hwmon",
> },
> diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
> index 5a013bb7bcad..f0cb239546a9 100644
> --- a/drivers/input/touchscreen/da9052_tsi.c
> +++ b/drivers/input/touchscreen/da9052_tsi.c
> @@ -16,6 +16,7 @@
> #include <linux/delay.h>
> #include <linux/platform_device.h>
> #include <linux/interrupt.h>
> +#include <linux/property.h>
>
> #include <linux/mfd/da9052/reg.h>
> #include <linux/mfd/da9052/da9052.h>
> @@ -238,6 +239,10 @@ static int da9052_ts_probe(struct platform_device *pdev)
> if (!da9052)
> return -EINVAL;
>
> + /* check if pins are used as general purpose ADC input */
> + if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"))
> + return -ENODEV;
> +
> tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
> input_dev = input_allocate_device();
> if (!tsi || !input_dev) {
> diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
> index ce9230af09c2..ae5b663836d0 100644
> --- a/include/linux/mfd/da9052/da9052.h
> +++ b/include/linux/mfd/da9052/da9052.h
> @@ -45,6 +45,12 @@
> #define DA9052_ADC_TJUNC 8
> #define DA9052_ADC_VBBAT 9
>
> +/* TSI channel has its own 4 channel mux */
> +#define DA9052_ADC_TSI_XP 70
> +#define DA9052_ADC_TSI_XN 71
> +#define DA9052_ADC_TSI_YP 72
> +#define DA9052_ADC_TSI_YN 73
> +
> #define DA9052_IRQ_DCIN 0
> #define DA9052_IRQ_VBUS 1
> #define DA9052_IRQ_DCINREM 2
> --
> 2.11.0
>
Hi Sebastian,
On 26 June 2017 15:49 Sebastian Reichel wrote:
> Subject: [PATCH 2/2] hwmon: da9052: add support for TSI channel
>
> TSI channel has a 4 channel mux connected to it and is normally
> used for touchscreen support. The hardware may alternatively
> use it as general purpose adc.
>
> Signed-off-by: Sebastian Reichel <[email protected]>
> ---
> .../devicetree/bindings/mfd/da9052-i2c.txt | 8 +
> drivers/hwmon/da9052-hwmon.c | 229
> ++++++++++++++++++++-
> drivers/input/touchscreen/da9052_tsi.c | 5 +
> include/linux/mfd/da9052/da9052.h | 6 +
> 4 files changed, 244 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> index 9554292dc6cb..94f3bb1d9a0a 100644
> --- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> +++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> @@ -4,6 +4,14 @@ Required properties:
> - compatible : Should be "dlg,da9052", "dlg,da9053-aa",
> "dlg,da9053-ab", or "dlg,da9053-bb"
>
> +Optional properties:
> +- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen
> + input lines are used as general purpose analogue
> + input.
> +- diag,tsiref-microvolt: Voltage applied to the TSIREF pin, which is
> + used as reference voltage when reading TSI
> + pins as ADC. Defaults to 2500000.
> +
"dlg" is the standard vendor prefix we are using for Dialog Semiconductor
bindings. You can find this definition in the kernel file:
./Documentation/devicetree/bindings/vendor-prefixes.txt
> Sub-nodes:
> - regulators : Contain the regulator nodes. The DA9052/53 regulators are
> bound using their names as listed below:
> diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-
> hwmon.c
> index c9832bfacfe5..a0b9d5498ba4 100644
> --- a/drivers/hwmon/da9052-hwmon.c
> +++ b/drivers/hwmon/da9052-hwmon.c
> @@ -20,13 +20,17 @@
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/platform_device.h>
> +#include <linux/property.h>
>
> #include <linux/mfd/da9052/da9052.h>
> #include <linux/mfd/da9052/reg.h>
>
> struct da9052_hwmon {
> - struct da9052 *da9052;
> - struct mutex hwmon_lock;
> + struct da9052 *da9052;
> + struct mutex hwmon_lock;
> + bool tsi_as_adc;
> + int tsiref_mv;
> + struct completion tsidone;
> };
>
> static const char * const input_names[] = {
> @@ -37,6 +41,10 @@ static const char * const input_names[] = {
> [DA9052_ADC_IN4] = "ADC IN4",
> [DA9052_ADC_IN5] = "ADC IN5",
> [DA9052_ADC_IN6] = "ADC IN6",
> + [DA9052_ADC_TSI_XP] = "ADC TS X+",
> + [DA9052_ADC_TSI_YP] = "ADC TS Y+",
> + [DA9052_ADC_TSI_XN] = "ADC TS X-",
> + [DA9052_ADC_TSI_YN] = "ADC TS Y-",
> [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
> [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
> };
> @@ -59,6 +67,11 @@ static inline int vbbat_reg_to_mv(int value)
> return DIV_ROUND_CLOSEST(value * 5000, 1023);
> }
>
> +static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int
> value)
> +{
> + return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
> +}
> +
> static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
> {
> return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
> @@ -154,6 +167,103 @@ static ssize_t da9052_read_misc_channel(struct
> device *dev,
> return sprintf(buf, "%d\n", input_reg_to_mv(ret));
> }
>
> +static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int
> channel)
> +{
> + u8 val = BIT(6); /* TSI_MAN */
There is an explicit #define for bit 6 from the TSI control register B, in the
file include/linux/mfd/da9052/reg.h #define DA9052_TSICONTB_TSIMAN 0X40
> +
> + switch (channel) {
> + case DA9052_ADC_TSI_XP:
> + val |= (0 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_YP:
> + val |= (1 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_XN:
> + val |= (2 << 4); /* TSI_MUX */
> + break;
> + case DA9052_ADC_TSI_YN:
> + val |= (3 << 4); /* TSI_MUX */
> + break;
> + }
Same for these magic numbers.
Although I don't find any entries for these in the reg.h file.
The datasheet for DA9053, Revision 2.1, says
(http://www.dialog-semiconductor.com/products/da9053)
bits (5:4) R/W TSI_MUX
Direct setting of MUX selecting which XY pin is routed to ADC_IN7 input.
00: X+ (results will be stored in TSI_XM)
01: Y+ (results will be stored in TSI_YM)
10: X- (results will be stored in TSI_XM)
11: Y- (results will be stored in TSI_YM)
May I suggest adding explicit entries to the reg.h file, somewhere near the
TSI CONTROL REGISTER B BITS line. Something like this:
#define DA9052_TSICONTB_TSIMUX_XP_XM 0x00
#define DA9052_TSICONTB_TSIMUX_YP_YM 0x10
#define DA9052_TSICONTB_TSIMUX_XN_XM 0x20
#define DA9052_TSICONTB_TSIMUX_YN_YM 0x30
> +
> + return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
> +}
> +
> +static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int
> channel)
> +{
> + int msb, lsb;
> +
> + switch (channel) {
> + case DA9052_ADC_TSI_XP:
> + case DA9052_ADC_TSI_XN:
> + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG);
> + if (msb < 0)
> + return msb;
> +
> + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> + if (lsb < 0)
> + return lsb;
It seems you will risk having non-synchronous data reads by separating the MSB
and LSB read operations in this case.
Reading the datasheet on this, the TSI_X_MSB register latches the TSI_Y_MSB and
TSI_LSB registers, which in turn should allow for a single read operation across
these registers instead of four separate reads. The switch could then be
completed on the calculation instead across the four register reads.
da9052_group_read()?
> +
> + break;
> + case DA9052_ADC_TSI_YP:
> + case DA9052_ADC_TSI_YN:
> + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG);
> + if (msb < 0)
> + return msb;
> +
> + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> + if (lsb < 0)
> + return lsb;
> + lsb >>= 2;
The header file does contain some symbols to access the bits in the register
fields for these MSB X/Y and LSB registers.
/* TSI X CO-ORDINATE MSB RESULT REGISTER BITS */
#define DA9052_TSIXMSB_TSIXM 0XFF
/* TSI Y CO-ORDINATE MSB RESULT REGISTER BITS */
#define DA9052_TSIYMSB_TSIYM 0XFF
/* TSI CO-ORDINATE LSB RESULT REGISTER BITS */
#define DA9052_TSILSB_PENDOWN 0X40
#define DA9052_TSILSB_TSIZL 0X30
#define DA9052_TSILSB_TSIYL 0X0C
#define DA9052_TSILSB_TSIXL 0X03
> +
> + break;
> + default:
> + return -ENXIO;
Is this a function argument error and should be, EINVAL?
> + }
> +
> + return (msb << 2) | (lsb & 0x3);
> +}
Although the reg.h register header file does not explicitly label MASK defines,
and there do not seem to be any SHIFT defines in the TSI X/Y CO-ORDINATE bits,
new entries can be added if necessary.
> +
> +
> +static ssize_t __da9052_read_tsi(struct device *dev, int channel)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + reinit_completion(&hwmon->tsidone);
> +
> + ret = da9052_request_tsi_read(hwmon, channel);
> + if (ret < 0)
> + return ret;
> +
> + /* Wait for an conversion done interrupt */
> + if (!wait_for_completion_timeout(&hwmon->tsidone,
> + msecs_to_jiffies(500))) {
> + dev_err(dev, "timeout waiting for TSI conversion interrupt\n");
> + return -ETIMEDOUT;
> + }
> +
> + return da9052_get_tsi_result(hwmon, channel);
> +}
> +
> +static ssize_t da9052_read_tsi(struct device *dev,
> + struct device_attribute *devattr,
> + char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int channel = to_sensor_dev_attr(devattr)->index;
> + int ret;
> +
> + mutex_lock(&hwmon->hwmon_lock);
> + ret = __da9052_read_tsi(dev, channel);
> + mutex_unlock(&hwmon->hwmon_lock);
> +
> + if (ret < 0)
> + return ret;
> + else
> + return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
> +}
> +
> static ssize_t da9052_read_tjunc(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> @@ -196,6 +306,28 @@ static ssize_t show_label(struct device *dev,
> input_names[to_sensor_dev_attr(devattr)->index]);
> }
>
> +static umode_t da9052_channel_is_visible(struct kobject *kobj,
> + struct attribute *a, int index)
> +{
> + struct device *dev = container_of(kobj, struct device, kobj);
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> +
> + switch (index) {
> + case DA9052_ADC_TSI_XP:
> + case DA9052_ADC_TSI_YP:
> + case DA9052_ADC_TSI_XN:
> + case DA9052_ADC_TSI_YN:
> + break;
> + default:
> + return a->mode;
> + }
> +
> + if (!hwmon->tsi_as_adc)
> + return 0;
> +
> + return a->mode;
> +}
> +
> static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout,
> NULL,
> DA9052_ADC_VDDOUT);
> static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
> @@ -221,6 +353,23 @@ static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO,
> da9052_read_vbbat, NULL,
> static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
> DA9052_ADC_VBBAT);
>
> +static SENSOR_DEVICE_ATTR(in70_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in70_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in71_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in71_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in72_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in72_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in73_input, S_IRUGO, da9052_read_tsi, NULL,
> + DA9052_ADC_TSI_YN);
> +static SENSOR_DEVICE_ATTR(in73_label, S_IRUGO, show_label, NULL,
> + DA9052_ADC_TSI_YN);
> +
> static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich,
> NULL,
> DA9052_ADC_ICH);
> static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
> @@ -246,6 +395,14 @@ static struct attribute *da9052_attrs[] = {
> &sensor_dev_attr_in5_label.dev_attr.attr,
> &sensor_dev_attr_in6_input.dev_attr.attr,
> &sensor_dev_attr_in6_label.dev_attr.attr,
> + &sensor_dev_attr_in70_input.dev_attr.attr,
> + &sensor_dev_attr_in70_label.dev_attr.attr,
> + &sensor_dev_attr_in71_input.dev_attr.attr,
> + &sensor_dev_attr_in71_label.dev_attr.attr,
> + &sensor_dev_attr_in72_input.dev_attr.attr,
> + &sensor_dev_attr_in72_label.dev_attr.attr,
> + &sensor_dev_attr_in73_input.dev_attr.attr,
> + &sensor_dev_attr_in73_label.dev_attr.attr,
> &sensor_dev_attr_in9_input.dev_attr.attr,
> &sensor_dev_attr_in9_label.dev_attr.attr,
> &sensor_dev_attr_curr1_input.dev_attr.attr,
> @@ -257,29 +414,93 @@ static struct attribute *da9052_attrs[] = {
> NULL
> };
>
> -ATTRIBUTE_GROUPS(da9052);
> +static const struct attribute_group da9052_group = {
> + .attrs = da9052_attrs,
> + .is_visible = da9052_channel_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(da9052);
> +
> +static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
> +{
> + struct da9052_hwmon *hwmon = data;
> + complete(&hwmon->tsidone);
> + return IRQ_HANDLED;
> +}
>
> static int da9052_hwmon_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct da9052_hwmon *hwmon;
> struct device *hwmon_dev;
> + int err;
>
> hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon),
> GFP_KERNEL);
> if (!hwmon)
> return -ENOMEM;
>
> + platform_set_drvdata(pdev, hwmon);
> +
> mutex_init(&hwmon->hwmon_lock);
> hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
>
> + init_completion(&hwmon->tsidone);
> +
> + hwmon->tsi_as_adc =
> + device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc");
Dialog device tree bindings should be "dlg" not "diag".
> +
> + /* get tsiref from DT, default to 2.5 Volt (typ. value in datasheet) */
> + hwmon->tsiref_mv = 2500000;
> + device_property_read_u32(pdev->dev.parent, "diag,tsiref-microvolt",
> + &hwmon->tsiref_mv);
> +
> + /* convert from microvolt (DT) to millivolt (hwmon) */
> + hwmon->tsiref_mv /= 1000;
> +
> + /* TSIREF must be between 1.8 and 2.6 Volt according to datasheet */
> + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
> + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d\n",
> + hwmon->tsiref_mv);
> + return -ENXIO;
> + }
> +
> + if (hwmon->tsi_as_adc) {
> + /* disable touchscreen features */
> + da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
> +
> + err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
> + "tsiready-irq" da9052_tsi_datardy_irq,
> + hwmon);
> + if (err) {
> + dev_err(hwmon->da9052->dev,
> + "Failed to register TSIRDY IRQ: %d\n", err);
> + return err;
> + }
> + }
> +
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
> hwmon,
> da9052_groups);
> - return PTR_ERR_OR_ZERO(hwmon_dev);
> + err = PTR_ERR_OR_ZERO(hwmon_dev);
> + if (err) {
> + if (hwmon->tsi_as_adc)
> + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int da9052_hwmon_remove(struct platform_device *pdev)
> +{
> + struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
> + if (hwmon->tsi_as_adc)
> + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> + return 0;
> }
>
> static struct platform_driver da9052_hwmon_driver = {
> .probe = da9052_hwmon_probe,
> + .remove = da9052_hwmon_remove,
> .driver = {
> .name = "da9052-hwmon",
> },
> diff --git a/drivers/input/touchscreen/da9052_tsi.c
> b/drivers/input/touchscreen/da9052_tsi.c
> index 5a013bb7bcad..f0cb239546a9 100644
> --- a/drivers/input/touchscreen/da9052_tsi.c
> +++ b/drivers/input/touchscreen/da9052_tsi.c
> @@ -16,6 +16,7 @@
> #include <linux/delay.h>
> #include <linux/platform_device.h>
> #include <linux/interrupt.h>
> +#include <linux/property.h>
>
> #include <linux/mfd/da9052/reg.h>
> #include <linux/mfd/da9052/da9052.h>
> @@ -238,6 +239,10 @@ static int da9052_ts_probe(struct platform_device
> *pdev)
> if (!da9052)
> return -EINVAL;
>
> + /* check if pins are used as general purpose ADC input */
> + if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"))
> + return -ENODEV;
> +
Doesn't this presume the hwmon driver is being used?
If this "tsi-as-adc" exists in the DT binary blob and the hwmon driver is not
added, would this still disable the TS?
> tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
> input_dev = input_allocate_device();
> if (!tsi || !input_dev) {
> diff --git a/include/linux/mfd/da9052/da9052.h
> b/include/linux/mfd/da9052/da9052.h
> index ce9230af09c2..ae5b663836d0 100644
> --- a/include/linux/mfd/da9052/da9052.h
> +++ b/include/linux/mfd/da9052/da9052.h
> @@ -45,6 +45,12 @@
> #define DA9052_ADC_TJUNC 8
> #define DA9052_ADC_VBBAT 9
>
> +/* TSI channel has its own 4 channel mux */
> +#define DA9052_ADC_TSI_XP 70
> +#define DA9052_ADC_TSI_XN 71
> +#define DA9052_ADC_TSI_YP 72
> +#define DA9052_ADC_TSI_YN 73
> +
> #define DA9052_IRQ_DCIN 0
> #define DA9052_IRQ_VBUS 1
> #define DA9052_IRQ_DCINREM 2
> --
> 2.11.0
Regards,
Steve