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Date: Wed, 15 Jul 2015 14:48:07 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Sebastian Reichel <sre@...nel.org>
Cc: linux-input@...r.kernel.org,
Michael Welling <mwelling@...cinc.com>,
Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] Input: tsc2005 - convert to regmap
On Wed, Jul 15, 2015 at 02:29:55PM -0700, Dmitry Torokhov wrote:
> Hi Sebastian,
>
> On Wed, Jul 15, 2015 at 02:13:26PM +0200, Sebastian Reichel wrote:
>
> > /* read the coordinates */
> > - error = spi_sync(ts->spi, &ts->spi_read_msg);
> > + error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
> > + TSC2005_DATA_REGS);
> > if (unlikely(error))
> > goto out;
> >
> > - x = ts->spi_x.spi_rx;
> > - y = ts->spi_y.spi_rx;
> > - z1 = ts->spi_z1.spi_rx;
> > - z2 = ts->spi_z2.spi_rx;
> > -
> > /* validate position */
> > - if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
> > + if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
> > goto out;
> >
> > /* Skip reading if the pressure components are out of range */
> > - if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
> > + if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
> > + goto out;
> > + if (unlikely(tsdata.z1 >= tsdata.z2))
> > goto out;
>
> I guess that means that tsc2005 is (and was) endian-broken. We can't use
> the data off the wire directly... So I'll drop bucnh of the changes in
> this function so we can convert to CPU endianness before using.
Ah, no, SPI transfers do convert to/from CPU endianness...
>
> I also got:
>
> CC [M] drivers/input/touchscreen/tsc2005.o
> Building modules, stage 2.
> Kernel: arch/x86/boot/bzImage is ready (#1383)
> MODPOST 1403 modules
> ERROR: "devm_regmap_init_spi" [drivers/input/touchscreen/tsc2005.ko]
> undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2
>
> I guess we need "select REGMAP_SPI".
>
> Thanks.
>
> --
> Dmitry
>
>
> Input: tsc2005 - convert to regmap
>
> From: Sebastian Reichel <sre@...nel.org>
>
> Convert driver, so that it uses regmap instead of directly using
> spi_transfer for all register accesses.
>
> Signed-off-by: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> drivers/input/touchscreen/Kconfig | 9 +-
> drivers/input/touchscreen/tsc2005.c | 149 ++++++++++++-----------------------
> 2 files changed, 55 insertions(+), 103 deletions(-)
>
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 9b3da52..c1acbbc 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -915,10 +915,11 @@ config TOUCHSCREEN_TSC_SERIO
> module will be called tsc40.
>
> config TOUCHSCREEN_TSC2005
> - tristate "TSC2005 based touchscreens"
> - depends on SPI_MASTER
> - help
> - Say Y here if you have a TSC2005 based touchscreen.
> + tristate "TSC2005 based touchscreens"
> + depends on SPI_MASTER
> + select REGMAP_SPI
> + help
> + Say Y here if you have a TSC2005 based touchscreen.
>
> If unsure, say N.
>
> diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
> index 2a27a1f..a04248e 100644
> --- a/drivers/input/touchscreen/tsc2005.c
> +++ b/drivers/input/touchscreen/tsc2005.c
> @@ -34,6 +34,7 @@
> #include <linux/spi/spi.h>
> #include <linux/spi/tsc2005.h>
> #include <linux/regulator/consumer.h>
> +#include <linux/regmap.h>
>
> /*
> * The touchscreen interface operates as follows:
> @@ -120,20 +121,36 @@
> #define TSC2005_SPI_MAX_SPEED_HZ 10000000
> #define TSC2005_PENUP_TIME_MS 40
>
> -struct tsc2005_spi_rd {
> - struct spi_transfer spi_xfer;
> - u32 spi_tx;
> - u32 spi_rx;
> +static const struct regmap_range tsc2005_writable_ranges[] = {
> + regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2),
> };
>
> +static const struct regmap_access_table tsc2005_writable_table = {
> + .yes_ranges = tsc2005_writable_ranges,
> + .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges),
> +};
> +
> +static struct regmap_config tsc2005_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + .reg_stride = 0x08,
> + .max_register = 0x78,
> + .read_flag_mask = TSC2005_REG_READ,
> + .wr_table = &tsc2005_writable_table,
> + .use_single_rw = true,
> +};
> +
> +struct tsc2005_data {
> + u16 x;
> + u16 y;
> + u16 z1;
> + u16 z2;
> +} __packed;
> +#define TSC2005_DATA_REGS 4
> +
> struct tsc2005 {
> struct spi_device *spi;
> -
> - struct spi_message spi_read_msg;
> - struct tsc2005_spi_rd spi_x;
> - struct tsc2005_spi_rd spi_y;
> - struct tsc2005_spi_rd spi_z1;
> - struct tsc2005_spi_rd spi_z2;
> + struct regmap *regmap;
>
> struct input_dev *idev;
> char phys[32];
> @@ -190,62 +207,6 @@ static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
> return 0;
> }
>
> -static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
> -{
> - u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
> - struct spi_transfer xfer = {
> - .tx_buf = &tx,
> - .len = 4,
> - .bits_per_word = 24,
> - };
> - struct spi_message msg;
> - int error;
> -
> - spi_message_init(&msg);
> - spi_message_add_tail(&xfer, &msg);
> -
> - error = spi_sync(ts->spi, &msg);
> - if (error) {
> - dev_err(&ts->spi->dev,
> - "%s: failed, register: %x, value: %x, error: %d\n",
> - __func__, reg, value, error);
> - return error;
> - }
> -
> - return 0;
> -}
> -
> -static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
> -{
> - memset(rd, 0, sizeof(*rd));
> -
> - rd->spi_tx = (reg | TSC2005_REG_READ) << 16;
> - rd->spi_xfer.tx_buf = &rd->spi_tx;
> - rd->spi_xfer.rx_buf = &rd->spi_rx;
> - rd->spi_xfer.len = 4;
> - rd->spi_xfer.bits_per_word = 24;
> - rd->spi_xfer.cs_change = !last;
> -}
> -
> -static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
> -{
> - struct tsc2005_spi_rd spi_rd;
> - struct spi_message msg;
> - int error;
> -
> - tsc2005_setup_read(&spi_rd, reg, true);
> -
> - spi_message_init(&msg);
> - spi_message_add_tail(&spi_rd.spi_xfer, &msg);
> -
> - error = spi_sync(ts->spi, &msg);
> - if (error)
> - return error;
> -
> - *value = spi_rd.spi_rx;
> - return 0;
> -}
> -
> static void tsc2005_update_pen_state(struct tsc2005 *ts,
> int x, int y, int pressure)
> {
> @@ -276,17 +237,19 @@ static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
> unsigned int pressure;
> u32 x, y;
> u32 z1, z2;
> + struct tsc2005_data tsdata;
> int error;
>
> /* read the coordinates */
> - error = spi_sync(ts->spi, &ts->spi_read_msg);
> + error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
> + TSC2005_DATA_REGS);
> if (unlikely(error))
> goto out;
>
> - x = ts->spi_x.spi_rx;
> - y = ts->spi_y.spi_rx;
> - z1 = ts->spi_z1.spi_rx;
> - z2 = ts->spi_z2.spi_rx;
> + x = tsdata.x;
> + y = tsdata.y;
> + z1 = tsdata.z1;
> + z2 = tsdata.z2;
>
> /* validate position */
> if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
> @@ -346,9 +309,9 @@ static void tsc2005_penup_timer(unsigned long data)
>
> static void tsc2005_start_scan(struct tsc2005 *ts)
> {
> - tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
> - tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
> - tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
> + regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
> + regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
> + regmap_write(ts->regmap, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
> tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
> }
>
> @@ -398,9 +361,9 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
> {
> struct spi_device *spi = to_spi_device(dev);
> struct tsc2005 *ts = spi_get_drvdata(spi);
> - u16 temp_high;
> - u16 temp_high_orig;
> - u16 temp_high_test;
> + unsigned int temp_high;
> + unsigned int temp_high_orig;
> + unsigned int temp_high_test;
> bool success = true;
> int error;
>
> @@ -411,7 +374,7 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
> */
> __tsc2005_disable(ts);
>
> - error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
> + error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
> if (error) {
> dev_warn(dev, "selftest failed: read error %d\n", error);
> success = false;
> @@ -420,14 +383,14 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
>
> temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
>
> - error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
> + error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test);
> if (error) {
> dev_warn(dev, "selftest failed: write error %d\n", error);
> success = false;
> goto out;
> }
>
> - error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
> + error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
> if (error) {
> dev_warn(dev, "selftest failed: read error %d after write\n",
> error);
> @@ -450,7 +413,7 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
> goto out;
>
> /* test that the reset really happened */
> - error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
> + error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
> if (error) {
> dev_warn(dev, "selftest failed: read error %d after reset\n",
> error);
> @@ -503,7 +466,7 @@ static void tsc2005_esd_work(struct work_struct *work)
> {
> struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
> int error;
> - u16 r;
> + unsigned int r;
>
> if (!mutex_trylock(&ts->mutex)) {
> /*
> @@ -519,7 +482,7 @@ static void tsc2005_esd_work(struct work_struct *work)
> goto out;
>
> /* We should be able to read register without disabling interrupts. */
> - error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
> + error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r);
> if (!error &&
> !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
> goto out;
> @@ -583,20 +546,6 @@ static void tsc2005_close(struct input_dev *input)
> mutex_unlock(&ts->mutex);
> }
>
> -static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
> -{
> - tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
> - tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
> - tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
> - tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
> -
> - spi_message_init(&ts->spi_read_msg);
> - spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
> - spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
> - spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
> - spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
> -}
> -
> static int tsc2005_probe(struct spi_device *spi)
> {
> const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
> @@ -661,6 +610,10 @@ static int tsc2005_probe(struct spi_device *spi)
> ts->spi = spi;
> ts->idev = input_dev;
>
> + ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config);
> + if (IS_ERR(ts->regmap))
> + return PTR_ERR(ts->regmap);
> +
> ts->x_plate_ohm = x_plate_ohm;
> ts->esd_timeout = esd_timeout;
>
> @@ -700,8 +653,6 @@ static int tsc2005_probe(struct spi_device *spi)
>
> INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
>
> - tsc2005_setup_spi_xfer(ts);
> -
> snprintf(ts->phys, sizeof(ts->phys),
> "%s/input-ts", dev_name(&spi->dev));
>
--
Dmitry
--
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