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>
This commit is contained in:
Sebastian Reichel
Lee Jones
parent
ebf555111b
commit
4f16cab19a
@ -20,13 +20,19 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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#include <linux/regulator/consumer.h>
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struct da9052_hwmon {
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struct da9052 *da9052;
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struct mutex hwmon_lock;
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struct da9052 *da9052;
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struct mutex hwmon_lock;
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bool tsi_as_adc;
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int tsiref_mv;
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struct regulator *tsiref;
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struct completion tsidone;
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};
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static const char * const input_names[] = {
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@ -37,6 +43,10 @@ static const char * const input_names[] = {
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[DA9052_ADC_IN4] = "ADC IN4",
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[DA9052_ADC_IN5] = "ADC IN5",
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[DA9052_ADC_IN6] = "ADC IN6",
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[DA9052_ADC_TSI_XP] = "ADC TS X+",
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[DA9052_ADC_TSI_YP] = "ADC TS Y+",
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[DA9052_ADC_TSI_XN] = "ADC TS X-",
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[DA9052_ADC_TSI_YN] = "ADC TS Y-",
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[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
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[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
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};
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@ -59,6 +69,11 @@ static inline int vbbat_reg_to_mv(int value)
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return DIV_ROUND_CLOSEST(value * 5000, 1023);
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}
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static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
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{
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return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
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}
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static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
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{
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return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
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@ -154,6 +169,97 @@ static ssize_t da9052_read_misc_channel(struct device *dev,
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return sprintf(buf, "%d\n", input_reg_to_mv(ret));
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}
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static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
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{
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u8 val = DA9052_TSICONTB_TSIMAN;
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switch (channel) {
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case DA9052_ADC_TSI_XP:
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val |= DA9052_TSICONTB_TSIMUX_XP;
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break;
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case DA9052_ADC_TSI_YP:
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val |= DA9052_TSICONTB_TSIMUX_YP;
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break;
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case DA9052_ADC_TSI_XN:
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val |= DA9052_TSICONTB_TSIMUX_XN;
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break;
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case DA9052_ADC_TSI_YN:
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val |= DA9052_TSICONTB_TSIMUX_YN;
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break;
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}
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return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
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}
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static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
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{
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u8 regs[3];
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int msb, lsb, err;
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/* block read to avoid separation of MSB and LSB */
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err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
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ARRAY_SIZE(regs), regs);
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if (err)
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return err;
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switch (channel) {
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case DA9052_ADC_TSI_XP:
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case DA9052_ADC_TSI_XN:
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msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
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lsb = regs[2] & DA9052_TSILSB_TSIXL;
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lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
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break;
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case DA9052_ADC_TSI_YP:
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case DA9052_ADC_TSI_YN:
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msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
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lsb = regs[2] & DA9052_TSILSB_TSIYL;
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lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
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break;
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default:
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return -EINVAL;
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}
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return msb | lsb;
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}
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static ssize_t __da9052_read_tsi(struct device *dev, int channel)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int ret;
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reinit_completion(&hwmon->tsidone);
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ret = da9052_request_tsi_read(hwmon, channel);
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if (ret < 0)
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return ret;
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/* Wait for an conversion done interrupt */
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if (!wait_for_completion_timeout(&hwmon->tsidone,
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msecs_to_jiffies(500)))
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return -ETIMEDOUT;
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return da9052_get_tsi_result(hwmon, channel);
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}
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static ssize_t da9052_read_tsi(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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int channel = to_sensor_dev_attr(devattr)->index;
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int ret;
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mutex_lock(&hwmon->hwmon_lock);
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ret = __da9052_read_tsi(dev, channel);
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mutex_unlock(&hwmon->hwmon_lock);
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if (ret < 0)
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return ret;
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else
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return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
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}
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static ssize_t da9052_read_tjunc(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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@ -196,6 +302,28 @@ static ssize_t show_label(struct device *dev,
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input_names[to_sensor_dev_attr(devattr)->index]);
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}
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static umode_t da9052_channel_is_visible(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
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struct device_attribute *dattr = container_of(attr,
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struct device_attribute, attr);
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struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
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if (!hwmon->tsi_as_adc) {
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switch (sattr->index) {
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case DA9052_ADC_TSI_XP:
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case DA9052_ADC_TSI_YP:
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case DA9052_ADC_TSI_XN:
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case DA9052_ADC_TSI_YN:
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return 0;
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}
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}
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return attr->mode;
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}
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static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
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DA9052_ADC_VDDOUT);
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static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
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@ -221,6 +349,23 @@ static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
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static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
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DA9052_ADC_VBBAT);
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static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
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DA9052_ADC_TSI_XP);
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static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
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DA9052_ADC_TSI_XP);
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static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
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DA9052_ADC_TSI_XN);
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static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
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DA9052_ADC_TSI_XN);
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static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
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DA9052_ADC_TSI_YP);
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static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
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DA9052_ADC_TSI_YP);
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static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
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DA9052_ADC_TSI_YN);
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static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
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DA9052_ADC_TSI_YN);
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static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
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DA9052_ADC_ICH);
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static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
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@ -246,6 +391,14 @@ static struct attribute *da9052_attrs[] = {
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&sensor_dev_attr_in5_label.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in6_label.dev_attr.attr,
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&sensor_dev_attr_in70_input.dev_attr.attr,
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&sensor_dev_attr_in70_label.dev_attr.attr,
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&sensor_dev_attr_in71_input.dev_attr.attr,
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&sensor_dev_attr_in71_label.dev_attr.attr,
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&sensor_dev_attr_in72_input.dev_attr.attr,
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&sensor_dev_attr_in72_label.dev_attr.attr,
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&sensor_dev_attr_in73_input.dev_attr.attr,
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&sensor_dev_attr_in73_label.dev_attr.attr,
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&sensor_dev_attr_in9_input.dev_attr.attr,
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&sensor_dev_attr_in9_label.dev_attr.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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@ -257,29 +410,117 @@ static struct attribute *da9052_attrs[] = {
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NULL
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};
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ATTRIBUTE_GROUPS(da9052);
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static const struct attribute_group da9052_group = {
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.attrs = da9052_attrs,
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.is_visible = da9052_channel_is_visible,
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};
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__ATTRIBUTE_GROUPS(da9052);
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static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
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{
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struct da9052_hwmon *hwmon = data;
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complete(&hwmon->tsidone);
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return IRQ_HANDLED;
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}
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static int da9052_hwmon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da9052_hwmon *hwmon;
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struct device *hwmon_dev;
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int err;
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hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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platform_set_drvdata(pdev, hwmon);
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mutex_init(&hwmon->hwmon_lock);
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hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
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init_completion(&hwmon->tsidone);
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hwmon->tsi_as_adc =
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device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
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if (hwmon->tsi_as_adc) {
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hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
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if (IS_ERR(hwmon->tsiref)) {
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err = PTR_ERR(hwmon->tsiref);
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dev_err(&pdev->dev, "failed to get tsiref: %d", err);
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return err;
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}
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err = regulator_enable(hwmon->tsiref);
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if (err)
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return err;
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hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
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if (hwmon->tsiref_mv < 0) {
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err = hwmon->tsiref_mv;
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goto exit_regulator;
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}
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/* convert from microvolt (DT) to millivolt (hwmon) */
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hwmon->tsiref_mv /= 1000;
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/* TSIREF limits from datasheet */
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if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
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dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
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hwmon->tsiref_mv);
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err = -ENXIO;
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goto exit_regulator;
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}
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/* disable touchscreen features */
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da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
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err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
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"tsiready-irq", da9052_tsi_datardy_irq,
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hwmon);
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if (err) {
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dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
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err);
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goto exit_regulator;
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}
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}
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
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hwmon,
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da9052_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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err = PTR_ERR_OR_ZERO(hwmon_dev);
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if (err)
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goto exit_irq;
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return 0;
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exit_irq:
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if (hwmon->tsi_as_adc)
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da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
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exit_regulator:
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if (hwmon->tsiref)
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regulator_disable(hwmon->tsiref);
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return err;
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}
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static int da9052_hwmon_remove(struct platform_device *pdev)
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{
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struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
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if (hwmon->tsi_as_adc) {
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da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
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regulator_disable(hwmon->tsiref);
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}
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return 0;
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}
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static struct platform_driver da9052_hwmon_driver = {
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.probe = da9052_hwmon_probe,
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.remove = da9052_hwmon_remove,
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.driver = {
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.name = "da9052-hwmon",
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},
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