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path: root/drivers/iio/adc/exynos_adc.c
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Diffstat (limited to 'drivers/iio/adc/exynos_adc.c')
-rw-r--r--drivers/iio/adc/exynos_adc.c224
1 files changed, 217 insertions, 7 deletions
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 3a2dbb3b4926..c15756d7bf7f 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -35,6 +35,7 @@
#include <linux/regulator/consumer.h>
#include <linux/of_platform.h>
#include <linux/err.h>
+#include <linux/input.h>
#include <linux/iio/iio.h>
#include <linux/iio/machine.h>
@@ -42,12 +43,18 @@
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include <linux/platform_data/touchscreen-s3c2410.h>
+
/* S3C/EXYNOS4412/5250 ADC_V1 registers definitions */
#define ADC_V1_CON(x) ((x) + 0x00)
+#define ADC_V1_TSC(x) ((x) + 0x04)
#define ADC_V1_DLY(x) ((x) + 0x08)
#define ADC_V1_DATX(x) ((x) + 0x0C)
+#define ADC_V1_DATY(x) ((x) + 0x10)
+#define ADC_V1_UPDN(x) ((x) + 0x14)
#define ADC_V1_INTCLR(x) ((x) + 0x18)
#define ADC_V1_MUX(x) ((x) + 0x1c)
+#define ADC_V1_CLRINTPNDNUP(x) ((x) + 0x20)
/* S3C2410 ADC registers definitions */
#define ADC_S3C2410_MUX(x) ((x) + 0x18)
@@ -71,6 +78,30 @@
#define ADC_S3C2410_DATX_MASK 0x3FF
#define ADC_S3C2416_CON_RES_SEL (1u << 3)
+/* touch screen always uses channel 0 */
+#define ADC_S3C2410_MUX_TS 0
+
+/* ADCTSC Register Bits */
+#define ADC_S3C2443_TSC_UD_SEN (1u << 8)
+#define ADC_S3C2410_TSC_YM_SEN (1u << 7)
+#define ADC_S3C2410_TSC_YP_SEN (1u << 6)
+#define ADC_S3C2410_TSC_XM_SEN (1u << 5)
+#define ADC_S3C2410_TSC_XP_SEN (1u << 4)
+#define ADC_S3C2410_TSC_PULL_UP_DISABLE (1u << 3)
+#define ADC_S3C2410_TSC_AUTO_PST (1u << 2)
+#define ADC_S3C2410_TSC_XY_PST(x) (((x) & 0x3) << 0)
+
+#define ADC_TSC_WAIT4INT (ADC_S3C2410_TSC_YM_SEN | \
+ ADC_S3C2410_TSC_YP_SEN | \
+ ADC_S3C2410_TSC_XP_SEN | \
+ ADC_S3C2410_TSC_XY_PST(3))
+
+#define ADC_TSC_AUTOPST (ADC_S3C2410_TSC_YM_SEN | \
+ ADC_S3C2410_TSC_YP_SEN | \
+ ADC_S3C2410_TSC_XP_SEN | \
+ ADC_S3C2410_TSC_AUTO_PST | \
+ ADC_S3C2410_TSC_XY_PST(0))
+
/* Bit definitions for ADC_V2 */
#define ADC_V2_CON1_SOFT_RESET (1u << 2)
@@ -88,7 +119,9 @@
/* Bit definitions common for ADC_V1 and ADC_V2 */
#define ADC_CON_EN_START (1u << 0)
#define ADC_CON_EN_START_MASK (0x3 << 0)
+#define ADC_DATX_PRESSED (1u << 15)
#define ADC_DATX_MASK 0xFFF
+#define ADC_DATY_MASK 0xFFF
#define EXYNOS_ADC_TIMEOUT (msecs_to_jiffies(100))
@@ -98,17 +131,24 @@
struct exynos_adc {
struct exynos_adc_data *data;
struct device *dev;
+ struct input_dev *input;
void __iomem *regs;
struct regmap *pmu_map;
struct clk *clk;
struct clk *sclk;
unsigned int irq;
+ unsigned int tsirq;
+ unsigned int delay;
struct regulator *vdd;
struct completion completion;
u32 value;
unsigned int version;
+
+ bool read_ts;
+ u32 ts_x;
+ u32 ts_y;
};
struct exynos_adc_data {
@@ -197,6 +237,9 @@ static void exynos_adc_v1_init_hw(struct exynos_adc *info)
/* Enable 12-bit ADC resolution */
con1 |= ADC_V1_CON_RES;
writel(con1, ADC_V1_CON(info->regs));
+
+ /* set touchscreen delay */
+ writel(info->delay, ADC_V1_DLY(info->regs));
}
static void exynos_adc_v1_exit_hw(struct exynos_adc *info)
@@ -480,8 +523,8 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
if (info->data->start_conv)
info->data->start_conv(info, chan->address);
- timeout = wait_for_completion_timeout
- (&info->completion, EXYNOS_ADC_TIMEOUT);
+ timeout = wait_for_completion_timeout(&info->completion,
+ EXYNOS_ADC_TIMEOUT);
if (timeout == 0) {
dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
if (info->data->init_hw)
@@ -498,13 +541,55 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
return ret;
}
+static int exynos_read_s3c64xx_ts(struct iio_dev *indio_dev, int *x, int *y)
+{
+ struct exynos_adc *info = iio_priv(indio_dev);
+ unsigned long timeout;
+ int ret;
+
+ mutex_lock(&indio_dev->mlock);
+ info->read_ts = true;
+
+ reinit_completion(&info->completion);
+
+ writel(ADC_S3C2410_TSC_PULL_UP_DISABLE | ADC_TSC_AUTOPST,
+ ADC_V1_TSC(info->regs));
+
+ /* Select the ts channel to be used and Trigger conversion */
+ info->data->start_conv(info, ADC_S3C2410_MUX_TS);
+
+ timeout = wait_for_completion_timeout(&info->completion,
+ EXYNOS_ADC_TIMEOUT);
+ if (timeout == 0) {
+ dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
+ if (info->data->init_hw)
+ info->data->init_hw(info);
+ ret = -ETIMEDOUT;
+ } else {
+ *x = info->ts_x;
+ *y = info->ts_y;
+ ret = 0;
+ }
+
+ info->read_ts = false;
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
{
struct exynos_adc *info = (struct exynos_adc *)dev_id;
u32 mask = info->data->mask;
/* Read value */
- info->value = readl(ADC_V1_DATX(info->regs)) & mask;
+ if (info->read_ts) {
+ info->ts_x = readl(ADC_V1_DATX(info->regs));
+ info->ts_y = readl(ADC_V1_DATY(info->regs));
+ writel(ADC_TSC_WAIT4INT | ADC_S3C2443_TSC_UD_SEN, ADC_V1_TSC(info->regs));
+ } else {
+ info->value = readl(ADC_V1_DATX(info->regs)) & mask;
+ }
/* clear irq */
if (info->data->clear_irq)
@@ -515,6 +600,46 @@ static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
+/*
+ * Here we (ab)use a threaded interrupt handler to stay running
+ * for as long as the touchscreen remains pressed, we report
+ * a new event with the latest data and then sleep until the
+ * next timer tick. This mirrors the behavior of the old
+ * driver, with much less code.
+ */
+static irqreturn_t exynos_ts_isr(int irq, void *dev_id)
+{
+ struct exynos_adc *info = dev_id;
+ struct iio_dev *dev = dev_get_drvdata(info->dev);
+ u32 x, y;
+ bool pressed;
+ int ret;
+
+ while (info->input->users) {
+ ret = exynos_read_s3c64xx_ts(dev, &x, &y);
+ if (ret == -ETIMEDOUT)
+ break;
+
+ pressed = x & y & ADC_DATX_PRESSED;
+ if (!pressed) {
+ input_report_key(info->input, BTN_TOUCH, 0);
+ input_sync(info->input);
+ break;
+ }
+
+ input_report_abs(info->input, ABS_X, x & ADC_DATX_MASK);
+ input_report_abs(info->input, ABS_Y, y & ADC_DATY_MASK);
+ input_report_key(info->input, BTN_TOUCH, 1);
+ input_sync(info->input);
+
+ msleep(1);
+ };
+
+ writel(0, ADC_V1_CLRINTPNDNUP(info->regs));
+
+ return IRQ_HANDLED;
+}
+
static int exynos_adc_reg_access(struct iio_dev *indio_dev,
unsigned reg, unsigned writeval,
unsigned *readval)
@@ -566,18 +691,72 @@ static int exynos_adc_remove_devices(struct device *dev, void *c)
return 0;
}
+static int exynos_adc_ts_open(struct input_dev *dev)
+{
+ struct exynos_adc *info = input_get_drvdata(dev);
+
+ enable_irq(info->tsirq);
+
+ return 0;
+}
+
+static void exynos_adc_ts_close(struct input_dev *dev)
+{
+ struct exynos_adc *info = input_get_drvdata(dev);
+
+ disable_irq(info->tsirq);
+}
+
+static int exynos_adc_ts_init(struct exynos_adc *info)
+{
+ int ret;
+
+ if (info->tsirq <= 0)
+ return -ENODEV;
+
+ info->input = input_allocate_device();
+ if (!info->input)
+ return -ENOMEM;
+
+ info->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ info->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+ input_set_abs_params(info->input, ABS_X, 0, 0x3FF, 0, 0);
+ input_set_abs_params(info->input, ABS_Y, 0, 0x3FF, 0, 0);
+
+ info->input->name = "S3C24xx TouchScreen";
+ info->input->id.bustype = BUS_HOST;
+ info->input->open = exynos_adc_ts_open;
+ info->input->close = exynos_adc_ts_close;
+
+ input_set_drvdata(info->input, info);
+
+ ret = input_register_device(info->input);
+ if (ret) {
+ input_free_device(info->input);
+ return ret;
+ }
+
+ disable_irq(info->tsirq);
+ ret = request_threaded_irq(info->tsirq, NULL, exynos_ts_isr,
+ IRQF_ONESHOT, "touchscreen", info);
+ if (ret)
+ input_unregister_device(info->input);
+
+ return ret;
+}
+
static int exynos_adc_probe(struct platform_device *pdev)
{
struct exynos_adc *info = NULL;
struct device_node *np = pdev->dev.of_node;
+ struct s3c2410_ts_mach_info *pdata = dev_get_platdata(&pdev->dev);
struct iio_dev *indio_dev = NULL;
struct resource *mem;
+ bool has_ts = false;
int ret = -ENODEV;
int irq;
- if (!np)
- return ret;
-
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct exynos_adc));
if (!indio_dev) {
dev_err(&pdev->dev, "failed allocating iio device\n");
@@ -613,8 +792,14 @@ static int exynos_adc_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "no irq resource?\n");
return irq;
}
-
info->irq = irq;
+
+ irq = platform_get_irq(pdev, 1);
+ if (irq == -EPROBE_DEFER)
+ return irq;
+
+ info->tsirq = irq;
+
info->dev = &pdev->dev;
init_completion(&info->completion);
@@ -680,6 +865,22 @@ static int exynos_adc_probe(struct platform_device *pdev)
if (info->data->init_hw)
info->data->init_hw(info);
+ /* leave out any TS related code if unreachable */
+ if (IS_REACHABLE(CONFIG_INPUT)) {
+ has_ts = of_property_read_bool(pdev->dev.of_node,
+ "has-touchscreen") || pdata;
+ }
+
+ if (pdata)
+ info->delay = pdata->delay;
+ else
+ info->delay = 10000;
+
+ if (has_ts)
+ ret = exynos_adc_ts_init(info);
+ if (ret)
+ goto err_iio;
+
ret = of_platform_populate(np, exynos_adc_match, NULL, &indio_dev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "failed adding child nodes\n");
@@ -691,6 +892,11 @@ static int exynos_adc_probe(struct platform_device *pdev)
err_of_populate:
device_for_each_child(&indio_dev->dev, NULL,
exynos_adc_remove_devices);
+ if (has_ts) {
+ input_unregister_device(info->input);
+ free_irq(info->tsirq, info);
+ }
+err_iio:
iio_device_unregister(indio_dev);
err_irq:
free_irq(info->irq, info);
@@ -710,6 +916,10 @@ static int exynos_adc_remove(struct platform_device *pdev)
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct exynos_adc *info = iio_priv(indio_dev);
+ if (IS_REACHABLE(CONFIG_INPUT)) {
+ free_irq(info->tsirq, info);
+ input_unregister_device(info->input);
+ }
device_for_each_child(&indio_dev->dev, NULL,
exynos_adc_remove_devices);
iio_device_unregister(indio_dev);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.