[PATCH 5/9] Staging/iio/adc/touchscreen/MXS: add i.MX23 support to the LRADC touchscreen driver
Jonathan Cameron
jic23 at kernel.org
Tue Oct 1 07:02:37 EDT 2013
On 09/23/13 15:36, Juergen Beisert wrote:
> 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>
Applied to the togreg branch of iio.git
Thanks,
> ---
> 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);
>
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