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Subject[PATCH] Input: stmpe-ts: add chip threshold function
Date
Signed-off-by: Silvio Fricke <silvio.fricke@gmail.com>
---
.../bindings/input/touchscreen/stmpe.txt | 3 ++
drivers/input/touchscreen/stmpe-ts.c | 38 +++++++++++++++-------
include/linux/mfd/stmpe.h | 1 +
3 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
index 127baa3..586f1e7 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
@@ -23,6 +23,8 @@ Optional properties:
the fractional part) recommended is 7
- st,i-drive: current limit value of the touchscreen drivers (0 -> 20 mA typical 35
mA max, 1 -> 50 mA typical 80 mA max)
+- st,fifo-threshold: size of samples in chip internal buffer. Needs to be
+ between 1 and 127, defaults to 1

Node name must be stmpe_touchscreen and should be child node of stmpe node to
which it belongs.
@@ -40,4 +42,5 @@ Example:
st,settling = <2>;
st,fraction-z = <7>;
st,i-drive = <1>;
+ st,fifo-threshold = <10>;
};
diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
index 2d5ff86..a40e573 100644
--- a/drivers/input/touchscreen/stmpe-ts.c
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -37,8 +37,12 @@
#define STMPE_REG_FIFO_TH 0x4A
#define STMPE_REG_FIFO_STA 0x4B
#define STMPE_REG_FIFO_SIZE 0x4C
+#define STMPE_REG_TSC_DATA_X 0x4d
+#define STMPE_REG_TSC_DATA_Y 0x4f
+#define STMPE_REG_TSC_DATA_Z 0x51
#define STMPE_REG_TSC_DATA_XYZ 0x52
#define STMPE_REG_TSC_FRACTION_Z 0x56
+#define STMPE_REG_TSC_DATA 0xD7
#define STMPE_REG_TSC_I_DRIVE 0x58

#define OP_MOD_XYZ 0
@@ -48,6 +52,7 @@
#define STMPE_FIFO_STA_RESET (1<<0)

#define STMPE_IRQ_TOUCH_DET 0
+#define STMPE_IRQ_FIFO_TH 1

#define SAMPLE_TIME(x) ((x & 0xf) << 4)
#define MOD_12B(x) ((x & 0x1) << 3)
@@ -77,6 +82,7 @@ struct stmpe_touch {
u8 settling;
u8 fraction_z;
u8 i_drive;
+ u8 threshold;
};

static int __stmpe_reset_fifo(struct stmpe *stmpe)
@@ -126,7 +132,7 @@ static void stmpe_work(struct work_struct *work)
static irqreturn_t stmpe_ts_handler(int irq, void *data)
{
u8 data_set[4];
- int x, y, z;
+ int x, y, z, i, fsize;
struct stmpe_touch *ts = data;

/*
@@ -144,17 +150,21 @@ static irqreturn_t stmpe_ts_handler(int irq, void *data)
stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
STMPE_TSC_CTRL_TSC_EN, 0);

- stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
+ fsize = stmpe_reg_read(ts->stmpe, STMPE_REG_FIFO_SIZE);

- x = (data_set[0] << 4) | (data_set[1] >> 4);
- y = ((data_set[1] & 0xf) << 8) | data_set[2];
- z = data_set[3];
+ for (i = 0; i < fsize; i++) {
+ stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA, 4, data_set);

- input_report_abs(ts->idev, ABS_X, x);
- input_report_abs(ts->idev, ABS_Y, y);
- input_report_abs(ts->idev, ABS_PRESSURE, z);
- input_report_key(ts->idev, BTN_TOUCH, 1);
- input_sync(ts->idev);
+ x = (data_set[0] << 4) | (data_set[1] >> 4);
+ y = ((data_set[1] & 0xf) << 8) | data_set[2];
+ z = data_set[3];
+
+ input_report_abs(ts->idev, ABS_X, x);
+ input_report_abs(ts->idev, ABS_Y, y);
+ input_report_abs(ts->idev, ABS_PRESSURE, z);
+ input_report_key(ts->idev, BTN_TOUCH, 1);
+ input_sync(ts->idev);
+ }

/* flush the FIFO after we have read out our values. */
__stmpe_reset_fifo(ts->stmpe);
@@ -225,7 +235,7 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
}

/* set FIFO to 1 for single point reading */
- ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
+ ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, ts->threshold);
if (ret) {
dev_err(dev, "Could not set FIFO\n");
return ret;
@@ -285,6 +295,7 @@ static void stmpe_ts_get_platform_info(struct platform_device *pdev,
ts->settling = ts_pdata->settling;
ts->fraction_z = ts_pdata->fraction_z;
ts->i_drive = ts_pdata->i_drive;
+ ts->threshold = ts_pdata->threshold;
} else if (np) {
u32 val;

@@ -306,7 +317,12 @@ static void stmpe_ts_get_platform_info(struct platform_device *pdev,
ts->fraction_z = val;
if (!of_property_read_u32(np, "st,i-drive", &val))
ts->i_drive = val;
+ if (!of_property_read_u32(np, "st,threshold", &val))
+ ts->threshold = val;
}
+
+ if ((ts->threshold < 1) || (ts->threshold > 127))
+ ts->threshold = 1;
}

static int stmpe_input_probe(struct platform_device *pdev)
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index c9d8690..34efc28e 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -156,6 +156,7 @@ struct stmpe_ts_platform_data {
u8 settling;
u8 fraction_z;
u8 i_drive;
+ u8 threshold;
};

/**
--
2.4.0


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