[PATCH 5/9] Staging/iio/adc/touchscreen/MXS: add i.MX23 support to the LRADC touchscreen driver
Juergen Beisert
jbe at pengutronix.de
Mon Sep 23 10:36:34 EDT 2013
Distinguish i.MX23 and i.MX28 at runtime and do the same for both SoC at least
for the 4 wire touchscreen.
Note: support for the remaining LRADC channels is not tested on an
i.MX23 yet.
Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
CC: linux-arm-kernel at lists.infradead.org
CC: linux-input at vger.kernel.org
CC: devel at driverdev.osuosl.org
CC: Marek Vasut <marex at denx.de>
CC: Fabio Estevam <fabio.estevam at freescale.com>
CC: Jonathan Cameron <jic23 at cam.ac.uk>
---
drivers/staging/iio/adc/mxs-lradc.c | 66 ++++++++++++++++++++++++++++++-------
1 file changed, 55 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index dd47ec2..a92e810 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -191,20 +191,33 @@ struct mxs_lradc {
# define LRADC_CTRL0_MX28_XNPSW /* XM */ (1 << 17)
# define LRADC_CTRL0_MX28_XPPSW /* XP */ (1 << 16)
+# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE (1 << 20)
+# define LRADC_CTRL0_MX23_YM (1 << 19)
+# define LRADC_CTRL0_MX23_XM (1 << 18)
+# define LRADC_CTRL0_MX23_YP (1 << 17)
+# define LRADC_CTRL0_MX23_XP (1 << 16)
+
# define LRADC_CTRL0_MX28_PLATE_MASK \
(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
+# define LRADC_CTRL0_MX23_PLATE_MASK \
+ (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
+ LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
+ LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
+
#define LRADC_CTRL1 0x10
#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN (1 << 24)
#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
+#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
#define LRADC_CTRL1_TOUCH_DETECT_IRQ (1 << 8)
#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
+#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
#define LRADC_CTRL2 0x20
@@ -255,37 +268,58 @@ static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
{
- return LRADC_CTRL0_MX28_PLATE_MASK;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_PLATE_MASK;
+ else
+ return LRADC_CTRL0_MX28_PLATE_MASK;
}
static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
{
- return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
+ else
+ return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
}
static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
{
- return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
+ else
+ return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
}
static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
{
- return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
+ else
+ return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
}
static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
{
- return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
+ else
+ return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
}
static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
{
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
+ else
+ return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
}
static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
{
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
+ else
+ return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
}
/*
@@ -322,7 +356,8 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
* Virtual channel 0 is always used here as the others are always not
* used if doing raw sampling.
*/
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
LRADC_CTRL1);
mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
@@ -770,7 +805,8 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
if (ret < 0)
goto err_buf;
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
LRADC_CTRL1);
mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
@@ -808,7 +844,8 @@ static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
LRADC_DELAY_KICK, LRADC_DELAY(0));
mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
LRADC_CTRL1);
kfree(lradc->buffer);
@@ -912,7 +949,8 @@ static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
/* Configure the touchscreen type */
- mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ if (lradc->soc == IMX28_LRADC) {
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
LRADC_CTRL0);
if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
@@ -993,6 +1031,12 @@ static int mxs_lradc_probe(struct platform_device *pdev)
dev_warn(dev, "Unsupported number of touchscreen wires (%d)\n",
ts_wires);
+ if ((lradc->soc == IMX23_LRADC) && (ts_wires == 5)) {
+ dev_warn(dev, "No support for 5 wire touches on i.MX23\n");
+ dev_warn(dev, "Falling back to 4 wire\n");
+ ts_wires = 4;
+ }
+
/* Grab all IRQ sources */
for (i = 0; i < of_cfg->irq_count; i++) {
lradc->irq[i] = platform_get_irq(pdev, i);
--
1.8.4.rc3
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