| Message ID | 20170626144832.32322-3-sebastian.reichel@collabora.co.uk (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
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 <sebastian.reichel@collabora.co.uk> > --- > .../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 > -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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 <sebastian.reichel@collabora.co.uk> > --- > .../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 -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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
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 <sebastian.reichel@collabora.co.uk> --- .../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(-)