+ .type = IIO_POSITIONRELATIVE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_XP,
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16
+ },
+ },
+ {
+ .extend_name = "touchscreen_yp",
+ .type = IIO_POSITIONRELATIVE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_YP,
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16
+ },
+ },
{
.extend_name = "aux",
.type = IIO_VOLTAGE,
@@ -418,6 +458,7 @@ static const struct iio_chan_spec
ingenic_channels[] = {
BIT(IIO_CHAN_INFO_SCALE),
.indexed = 1,
.channel = INGENIC_ADC_AUX,
+ .scan_index = -1
},
{
.extend_name = "battery",
@@ -428,6 +469,7 @@ static const struct iio_chan_spec
ingenic_channels[] = {
BIT(IIO_CHAN_INFO_SCALE),
.indexed = 1,
.channel = INGENIC_ADC_BATTERY,
+ .scan_index = -1
},
{ /* Must always be last in the array. */
.extend_name = "aux2",
@@ -436,16 +478,70 @@ static const struct iio_chan_spec
ingenic_channels[] = {
BIT(IIO_CHAN_INFO_SCALE),
.indexed = 1,
.channel = INGENIC_ADC_AUX2,
+ .scan_index = -1
},
};
+static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ clk_enable(adc->clk);
+ /* It takes significant time for the touchscreen hw to stabilize.
*/
+ msleep(50);
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
+ JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
+ JZ_ADC_REG_CFG_PULL_UP(4));
+ writew(80, adc->base + JZ_ADC_REG_ADWAIT);
+ writew(2, adc->base + JZ_ADC_REG_ADSAME);
+ writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
+ writel(0, adc->base + JZ_ADC_REG_ADTCH);
+ ingenic_adc_enable(adc, 2, true);
+
+ return 0;
+}
+
+static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ ingenic_adc_enable(adc, 2, false);
+ writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+ writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
+ writew(0, adc->base + JZ_ADC_REG_ADSAME);
+ writew(0, adc->base + JZ_ADC_REG_ADWAIT);
+ clk_disable(adc->clk);
+
+ return 0;
+}
+
+static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops
= {
+ .postenable = &ingenic_adc_buffer_enable,
+ .predisable = &ingenic_adc_buffer_disable
+};
+
+static irqreturn_t ingenic_adc_irq(int irq, void *data)
+{
+ struct iio_dev *iio_dev = data;
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+ u32 tdat;
+
+ tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
+ iio_push_to_buffers(iio_dev, &tdat);
+ writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
+
+ return IRQ_HANDLED;
+}
+
static int ingenic_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct iio_dev *iio_dev;
struct ingenic_adc *adc;
const struct ingenic_adc_soc_data *soc_data;
- int ret;
+ struct iio_buffer *buffer;
+ int irq, ret;
soc_data = device_get_match_data(dev);
if (!soc_data)
@@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct
platform_device *pdev)
mutex_init(&adc->aux_lock);
adc->soc_data = soc_data;
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "Failed to get irq: %d\n", irq);
+ return irq;
+ }
+ ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
+ dev_name(dev), iio_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to request irq: %d\n", ret);
+ return ret;
+ }
+
adc->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(adc->base))
return PTR_ERR(adc->base);
@@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct
platform_device *pdev)
iio_dev->dev.parent = dev;
iio_dev->name = "jz-adc";
- iio_dev->modes = INDIO_DIRECT_MODE;
+ iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
+ iio_dev->setup_ops = &ingenic_buffer_setup_ops;
iio_dev->channels = ingenic_channels;
iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
/* Remove AUX2 from the list of supported channels. */
@@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct
platform_device *pdev)
iio_dev->num_channels -= 1;
iio_dev->info = &ingenic_adc_info;
+ buffer = devm_iio_kfifo_allocate(dev);
+ if (!buffer) {
+ dev_err(dev, "Unable to add IIO buffer\n");
+ return -ENOMEM;
+ }
+ iio_device_attach_buffer(iio_dev, buffer);
+
ret = devm_iio_device_register(dev, iio_dev);
if (ret)
dev_err(dev, "Unable to register IIO device\n");
