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Input: tsc2005 - convert to regmap 

Convert driver so that it uses regmap instead of directly using
spi_transfer for all register accesses.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
hifive-unleashed-5.1
Sebastian Reichel 2015-07-27 17:27:25 -07:00 committed by Dmitry Torokhov
parent f00d1f8f1d
commit 273cf48aa9
2 changed files with 60 additions and 112 deletions
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1
drivers/input/touchscreen/Kconfig
View File

@ -917,6 +917,7 @@ config TOUCHSCREEN_TSC_SERIO
config TOUCHSCREEN_TSC2005
tristate "TSC2005 based touchscreens"
depends on SPI_MASTER
select REGMAP_SPI
help
Say Y here if you have a TSC2005 based touchscreen.

171
drivers/input/touchscreen/tsc2005.c
View File

@ -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 +121,37 @@
#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,
.write_flag_mask = TSC2005_REG_PND0,
.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 +208,6 @@ 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)
{
@ -274,26 +236,23 @@ static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
struct tsc2005 *ts = _ts;
unsigned long flags;
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;
/* 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;
/*
@ -301,8 +260,8 @@ static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
* the value before pen-up - that implies SPI fed us stale data
*/
if (!ts->pen_down &&
ts->in_x == x && ts->in_y == y &&
ts->in_z1 == z1 && ts->in_z2 == z2) {
ts->in_x == tsdata.x && ts->in_y == tsdata.y &&
ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {
goto out;
}
@ -310,20 +269,20 @@ static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
* At this point we are happy we have a valid and useful reading.
* Remember it for later comparisons. We may now begin downsampling.
*/
ts->in_x = x;
ts->in_y = y;
ts->in_z1 = z1;
ts->in_z2 = z2;
ts->in_x = tsdata.x;
ts->in_y = tsdata.y;
ts->in_z1 = tsdata.z1;
ts->in_z2 = tsdata.z2;
/* Compute touch pressure resistance using equation #1 */
pressure = x * (z2 - z1) / z1;
pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;
pressure = pressure * ts->x_plate_ohm / 4096;
if (unlikely(pressure > MAX_12BIT))
goto out;
spin_lock_irqsave(&ts->lock, flags);
tsc2005_update_pen_state(ts, x, y, pressure);
tsc2005_update_pen_state(ts, tsdata.x, tsdata.y, pressure);
mod_timer(&ts->penup_timer,
jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
@ -346,9 +305,9 @@ 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 +357,9 @@ 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 +370,7 @@ 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 +379,14 @@ 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 +409,7 @@ 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 +462,7 @@ 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 +478,7 @@ 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 +542,6 @@ 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 +606,10 @@ 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 +649,6 @@ 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));