| Message ID | 20170703084003.31184-7-sebastian.reichel@collabora.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jul 03, 2017 at 10:40:03AM +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> Acked-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/hwmon/da9052-hwmon.c | 249 ++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 245 insertions(+), 4 deletions(-) > > diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c > index 708c91ac601f..97a62f5b9ea4 100644 > --- a/drivers/hwmon/da9052-hwmon.c > +++ b/drivers/hwmon/da9052-hwmon.c > @@ -20,13 +20,19 @@ > #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> > +#include <linux/regulator/consumer.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 regulator *tsiref; > + struct completion tsidone; > }; > > static const char * const input_names[] = { > @@ -37,6 +43,10 @@ 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 +69,11 @@ 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 +169,97 @@ 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 = DA9052_TSICONTB_TSIMAN; > + > + switch (channel) { > + case DA9052_ADC_TSI_XP: > + val |= DA9052_TSICONTB_TSIMUX_XP; > + break; > + case DA9052_ADC_TSI_YP: > + val |= DA9052_TSICONTB_TSIMUX_YP; > + break; > + case DA9052_ADC_TSI_XN: > + val |= DA9052_TSICONTB_TSIMUX_XN; > + break; > + case DA9052_ADC_TSI_YN: > + val |= DA9052_TSICONTB_TSIMUX_YN; > + 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) > +{ > + u8 regs[3]; > + int msb, lsb, err; > + > + /* block read to avoid separation of MSB and LSB */ > + err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG, > + ARRAY_SIZE(regs), regs); > + if (err) > + return err; > + > + switch (channel) { > + case DA9052_ADC_TSI_XP: > + case DA9052_ADC_TSI_XN: > + msb = regs[0] << DA9052_TSILSB_TSIXL_BITS; > + lsb = regs[2] & DA9052_TSILSB_TSIXL; > + lsb >>= DA9052_TSILSB_TSIXL_SHIFT; > + break; > + case DA9052_ADC_TSI_YP: > + case DA9052_ADC_TSI_YN: > + msb = regs[1] << DA9052_TSILSB_TSIYL_BITS; > + lsb = regs[2] & DA9052_TSILSB_TSIYL; > + lsb >>= DA9052_TSILSB_TSIYL_SHIFT; > + break; > + default: > + return -EINVAL; > + } > + > + return msb | lsb; > +} > + > + > +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))) > + 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 +302,28 @@ 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 *attr, int index) > +{ > + struct device *dev = container_of(kobj, struct device, kobj); > + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); > + struct device_attribute *dattr = container_of(attr, > + struct device_attribute, attr); > + struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); > + > + if (!hwmon->tsi_as_adc) { > + switch (sattr->index) { > + case DA9052_ADC_TSI_XP: > + case DA9052_ADC_TSI_YP: > + case DA9052_ADC_TSI_XN: > + case DA9052_ADC_TSI_YN: > + return 0; > + } > + } > + > + return attr->mode; > +} > + > static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL, > DA9052_ADC_VDDOUT); > static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL, > @@ -221,6 +349,23 @@ static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL, > static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL, > DA9052_ADC_VBBAT); > > +static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_XP); > +static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL, > + DA9052_ADC_TSI_XP); > +static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_XN); > +static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL, > + DA9052_ADC_TSI_XN); > +static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_YP); > +static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL, > + DA9052_ADC_TSI_YP); > +static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_YN); > +static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL, > + DA9052_ADC_TSI_YN); > + > static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL, > DA9052_ADC_ICH); > static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL, > @@ -246,6 +391,14 @@ 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 +410,117 @@ 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, "dlg,tsi-as-adc"); > + > + if (hwmon->tsi_as_adc) { > + hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); > + if (IS_ERR(hwmon->tsiref)) { > + err = PTR_ERR(hwmon->tsiref); > + dev_err(&pdev->dev, "failed to get tsiref: %d", err); > + return err; > + } > + > + err = regulator_enable(hwmon->tsiref); > + if (err) > + return err; > + > + hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); > + if (hwmon->tsiref_mv < 0) { > + err = hwmon->tsiref_mv; > + goto exit_regulator; > + } > + > + /* convert from microvolt (DT) to millivolt (hwmon) */ > + hwmon->tsiref_mv /= 1000; > + > + /* TSIREF limits from datasheet */ > + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { > + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", > + hwmon->tsiref_mv); > + err = -ENXIO; > + goto exit_regulator; > + } > + > + /* 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(&pdev->dev, "Failed to register TSIRDY IRQ: %d", > + err); > + goto exit_regulator; > + } > + } > + > 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) > + goto exit_irq; > + > + return 0; > + > +exit_irq: > + if (hwmon->tsi_as_adc) > + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); > +exit_regulator: > + if (hwmon->tsiref) > + regulator_disable(hwmon->tsiref); > + > + return err; > +} > + > +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); > + regulator_disable(hwmon->tsiref); > + } > + > + return 0; > } > > static struct platform_driver da9052_hwmon_driver = { > .probe = da9052_hwmon_probe, > + .remove = da9052_hwmon_remove, > .driver = { > .name = "da9052-hwmon", > }, -- To unsubscribe from this list: send the line "unsubscribe linux-input" 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/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c index 708c91ac601f..97a62f5b9ea4 100644 --- a/drivers/hwmon/da9052-hwmon.c +++ b/drivers/hwmon/da9052-hwmon.c @@ -20,13 +20,19 @@ #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> +#include <linux/regulator/consumer.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 regulator *tsiref; + struct completion tsidone; }; static const char * const input_names[] = { @@ -37,6 +43,10 @@ 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 +69,11 @@ 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 +169,97 @@ 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 = DA9052_TSICONTB_TSIMAN; + + switch (channel) { + case DA9052_ADC_TSI_XP: + val |= DA9052_TSICONTB_TSIMUX_XP; + break; + case DA9052_ADC_TSI_YP: + val |= DA9052_TSICONTB_TSIMUX_YP; + break; + case DA9052_ADC_TSI_XN: + val |= DA9052_TSICONTB_TSIMUX_XN; + break; + case DA9052_ADC_TSI_YN: + val |= DA9052_TSICONTB_TSIMUX_YN; + 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) +{ + u8 regs[3]; + int msb, lsb, err; + + /* block read to avoid separation of MSB and LSB */ + err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG, + ARRAY_SIZE(regs), regs); + if (err) + return err; + + switch (channel) { + case DA9052_ADC_TSI_XP: + case DA9052_ADC_TSI_XN: + msb = regs[0] << DA9052_TSILSB_TSIXL_BITS; + lsb = regs[2] & DA9052_TSILSB_TSIXL; + lsb >>= DA9052_TSILSB_TSIXL_SHIFT; + break; + case DA9052_ADC_TSI_YP: + case DA9052_ADC_TSI_YN: + msb = regs[1] << DA9052_TSILSB_TSIYL_BITS; + lsb = regs[2] & DA9052_TSILSB_TSIYL; + lsb >>= DA9052_TSILSB_TSIYL_SHIFT; + break; + default: + return -EINVAL; + } + + return msb | lsb; +} + + +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))) + 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 +302,28 @@ 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 *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); + struct device_attribute *dattr = container_of(attr, + struct device_attribute, attr); + struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); + + if (!hwmon->tsi_as_adc) { + switch (sattr->index) { + case DA9052_ADC_TSI_XP: + case DA9052_ADC_TSI_YP: + case DA9052_ADC_TSI_XN: + case DA9052_ADC_TSI_YN: + return 0; + } + } + + return attr->mode; +} + static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL, DA9052_ADC_VDDOUT); static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL, @@ -221,6 +349,23 @@ static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL, static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL, DA9052_ADC_VBBAT); +static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_XP); +static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL, + DA9052_ADC_TSI_XP); +static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_XN); +static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL, + DA9052_ADC_TSI_XN); +static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_YP); +static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL, + DA9052_ADC_TSI_YP); +static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_YN); +static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL, + DA9052_ADC_TSI_YN); + static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL, DA9052_ADC_ICH); static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL, @@ -246,6 +391,14 @@ 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 +410,117 @@ 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, "dlg,tsi-as-adc"); + + if (hwmon->tsi_as_adc) { + hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); + if (IS_ERR(hwmon->tsiref)) { + err = PTR_ERR(hwmon->tsiref); + dev_err(&pdev->dev, "failed to get tsiref: %d", err); + return err; + } + + err = regulator_enable(hwmon->tsiref); + if (err) + return err; + + hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); + if (hwmon->tsiref_mv < 0) { + err = hwmon->tsiref_mv; + goto exit_regulator; + } + + /* convert from microvolt (DT) to millivolt (hwmon) */ + hwmon->tsiref_mv /= 1000; + + /* TSIREF limits from datasheet */ + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", + hwmon->tsiref_mv); + err = -ENXIO; + goto exit_regulator; + } + + /* 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(&pdev->dev, "Failed to register TSIRDY IRQ: %d", + err); + goto exit_regulator; + } + } + 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) + goto exit_irq; + + return 0; + +exit_irq: + if (hwmon->tsi_as_adc) + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); +exit_regulator: + if (hwmon->tsiref) + regulator_disable(hwmon->tsiref); + + return err; +} + +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); + regulator_disable(hwmon->tsiref); + } + + return 0; } static struct platform_driver da9052_hwmon_driver = { .probe = da9052_hwmon_probe, + .remove = da9052_hwmon_remove, .driver = { .name = "da9052-hwmon", },
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> --- drivers/hwmon/da9052-hwmon.c | 249 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 245 insertions(+), 4 deletions(-)