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Commit 3689abfc authored by Jeff LaBundy's avatar Jeff LaBundy Committed by Dmitry Torokhov
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Input: iqs269a - configure device with a single block write 

Unless it is being done as part of servicing a soft reset interrupt,
configuring channels on-the-fly (as is the case when writing to the
ati_trigger attribute) may cause GPIO3 (which reflects the state of
touch for a selected channel) to be inadvertently asserted.

To solve this problem, follow the vendor's recommendation and write
all channel configuration as well as the REDO_ATI register field as
part of a single block write. This ensures the device has been told
to re-calibrate itself following an I2C stop condition, after which
sensing resumes and GPIO3 may be asserted.

Fixes: 04e49867 ("Input: add support for Azoteq IQS269A")
Signed-off-by: default avatarJeff LaBundy <jeff@labundy.com>
Reviewed-by: default avatarMattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/Y7Rs8GyV7g0nF5Yy@nixie71Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent e023cc4a
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Showing with 39 additions and 59 deletions
drivers/input/misc/iqs269a.c
View file @ 3689abfc
......@@ -96,8 +96,6 @@
#define IQS269_MISC_B_TRACKING_UI_ENABLE BIT(4)
#define IQS269_MISC_B_FILT_STR_SLIDER GENMASK(1, 0)
#define IQS269_CHx_SETTINGS 0x8C
#define IQS269_CHx_ENG_A_MEAS_CAP_SIZE BIT(15)
#define IQS269_CHx_ENG_A_RX_GND_INACTIVE BIT(13)
#define IQS269_CHx_ENG_A_LOCAL_CAP_SIZE BIT(12)
......@@ -245,6 +243,18 @@ struct iqs269_ver_info {
u8 padding;
} __packed;
struct iqs269_ch_reg {
u8 rx_enable;
u8 tx_enable;
__be16 engine_a;
__be16 engine_b;
__be16 ati_comp;
u8 thresh[3];
u8 hyst;
u8 assoc_select;
u8 assoc_weight;
} __packed;
struct iqs269_sys_reg {
__be16 general;
u8 active;
......@@ -266,18 +276,7 @@ struct iqs269_sys_reg {
u8 timeout_swipe;
u8 thresh_swipe;
u8 redo_ati;
} __packed;
struct iqs269_ch_reg {
u8 rx_enable;
u8 tx_enable;
__be16 engine_a;
__be16 engine_b;
__be16 ati_comp;
u8 thresh[3];
u8 hyst;
u8 assoc_select;
u8 assoc_weight;
struct iqs269_ch_reg ch_reg[IQS269_NUM_CH];
} __packed;
struct iqs269_flags {
......@@ -292,7 +291,6 @@ struct iqs269_private {
struct regmap *regmap;
struct mutex lock;
struct iqs269_switch_desc switches[ARRAY_SIZE(iqs269_events)];
struct iqs269_ch_reg ch_reg[IQS269_NUM_CH];
struct iqs269_sys_reg sys_reg;
struct input_dev *keypad;
struct input_dev *slider[IQS269_NUM_SL];
......@@ -307,6 +305,7 @@ struct iqs269_private {
static int iqs269_ati_mode_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int mode)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_a;
if (ch_num >= IQS269_NUM_CH)
......@@ -317,12 +316,12 @@ static int iqs269_ati_mode_set(struct iqs269_private *iqs269,
mutex_lock(&iqs269->lock);
engine_a = be16_to_cpu(iqs269->ch_reg[ch_num].engine_a);
engine_a = be16_to_cpu(ch_reg[ch_num].engine_a);
engine_a &= ~IQS269_CHx_ENG_A_ATI_MODE_MASK;
engine_a |= (mode << IQS269_CHx_ENG_A_ATI_MODE_SHIFT);
iqs269->ch_reg[ch_num].engine_a = cpu_to_be16(engine_a);
ch_reg[ch_num].engine_a = cpu_to_be16(engine_a);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
......@@ -333,13 +332,14 @@ static int iqs269_ati_mode_set(struct iqs269_private *iqs269,
static int iqs269_ati_mode_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *mode)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_a;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_a = be16_to_cpu(iqs269->ch_reg[ch_num].engine_a);
engine_a = be16_to_cpu(ch_reg[ch_num].engine_a);
mutex_unlock(&iqs269->lock);
engine_a &= IQS269_CHx_ENG_A_ATI_MODE_MASK;
......@@ -351,6 +351,7 @@ static int iqs269_ati_mode_get(struct iqs269_private *iqs269,
static int iqs269_ati_base_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int base)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
......@@ -379,12 +380,12 @@ static int iqs269_ati_base_set(struct iqs269_private *iqs269,
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
engine_b &= ~IQS269_CHx_ENG_B_ATI_BASE_MASK;
engine_b |= base;
iqs269->ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
......@@ -395,13 +396,14 @@ static int iqs269_ati_base_set(struct iqs269_private *iqs269,
static int iqs269_ati_base_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *base)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
mutex_unlock(&iqs269->lock);
switch (engine_b & IQS269_CHx_ENG_B_ATI_BASE_MASK) {
......@@ -429,6 +431,7 @@ static int iqs269_ati_base_get(struct iqs269_private *iqs269,
static int iqs269_ati_target_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int target)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
......@@ -439,12 +442,12 @@ static int iqs269_ati_target_set(struct iqs269_private *iqs269,
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
engine_b &= ~IQS269_CHx_ENG_B_ATI_TARGET_MASK;
engine_b |= target / 32;
iqs269->ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
......@@ -455,13 +458,14 @@ static int iqs269_ati_target_set(struct iqs269_private *iqs269,
static int iqs269_ati_target_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *target)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
mutex_unlock(&iqs269->lock);
*target = (engine_b & IQS269_CHx_ENG_B_ATI_TARGET_MASK) * 32;
......@@ -531,13 +535,7 @@ static int iqs269_parse_chan(struct iqs269_private *iqs269,
if (fwnode_property_present(ch_node, "azoteq,slider1-select"))
iqs269->sys_reg.slider_select[1] |= BIT(reg);
ch_reg = &iqs269->ch_reg[reg];
error = regmap_raw_read(iqs269->regmap,
IQS269_CHx_SETTINGS + reg * sizeof(*ch_reg) / 2,
ch_reg, sizeof(*ch_reg));
if (error)
return error;
ch_reg = &iqs269->sys_reg.ch_reg[reg];
error = iqs269_parse_mask(ch_node, "azoteq,rx-enable",
&ch_reg->rx_enable);
......@@ -1042,10 +1040,8 @@ static int iqs269_parse_prop(struct iqs269_private *iqs269)
static int iqs269_dev_init(struct iqs269_private *iqs269)
{
struct iqs269_sys_reg *sys_reg = &iqs269->sys_reg;
struct iqs269_ch_reg *ch_reg;
unsigned int val;
int error, i;
int error;
mutex_lock(&iqs269->lock);
......@@ -1055,27 +1051,8 @@ static int iqs269_dev_init(struct iqs269_private *iqs269)
if (error)
goto err_mutex;
for (i = 0; i < IQS269_NUM_CH; i++) {
if (!(sys_reg->active & BIT(i)))
continue;
ch_reg = &iqs269->ch_reg[i];
error = regmap_raw_write(iqs269->regmap,
IQS269_CHx_SETTINGS + i *
sizeof(*ch_reg) / 2, ch_reg,
sizeof(*ch_reg));
if (error)
goto err_mutex;
}
/*
* The REDO-ATI and ATI channel selection fields must be written in the
* same block write, so every field between registers 0x80 through 0x8B
* (inclusive) must be written as well.
*/
error = regmap_raw_write(iqs269->regmap, IQS269_SYS_SETTINGS, sys_reg,
sizeof(*sys_reg));
error = regmap_raw_write(iqs269->regmap, IQS269_SYS_SETTINGS,
&iqs269->sys_reg, sizeof(iqs269->sys_reg));
if (error)
goto err_mutex;
......@@ -1349,6 +1326,7 @@ static ssize_t hall_bin_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
struct i2c_client *client = iqs269->client;
unsigned int val;
int error;
......@@ -1363,8 +1341,8 @@ static ssize_t hall_bin_show(struct device *dev,
if (error)
return error;
switch (iqs269->ch_reg[IQS269_CHx_HALL_ACTIVE].rx_enable &
iqs269->ch_reg[IQS269_CHx_HALL_INACTIVE].rx_enable) {
switch (ch_reg[IQS269_CHx_HALL_ACTIVE].rx_enable &
ch_reg[IQS269_CHx_HALL_INACTIVE].rx_enable) {
case IQS269_HALL_PAD_R:
val &= IQS269_CAL_DATA_A_HALL_BIN_R_MASK;
val >>= IQS269_CAL_DATA_A_HALL_BIN_R_SHIFT;
......@@ -1444,9 +1422,10 @@ static ssize_t rx_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
return scnprintf(buf, PAGE_SIZE, "%u\n",
iqs269->ch_reg[iqs269->ch_num].rx_enable);
ch_reg[iqs269->ch_num].rx_enable);
}
static ssize_t rx_enable_store(struct device *dev,
......@@ -1454,6 +1433,7 @@ static ssize_t rx_enable_store(struct device *dev,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
unsigned int val;
int error;
......@@ -1466,7 +1446,7 @@ static ssize_t rx_enable_store(struct device *dev,
mutex_lock(&iqs269->lock);
iqs269->ch_reg[iqs269->ch_num].rx_enable = val;
ch_reg[iqs269->ch_num].rx_enable = val;
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
......
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