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.

Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files 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",
         },