[PATCH 5.10 237/529] Input: iqs269a - configure device with a single block write

From: Jeff LaBundy jeff@labundy.com

[ Upstream commit 3689abfc4e369a643d758a02fb9ad0b2403d6d6d ]

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: 04e49867fad1 ("Input: add support for Azoteq IQS269A") Signed-off-by: Jeff LaBundy jeff@labundy.com Reviewed-by: Mattijs Korpershoek mkorpershoek@baylibre.com Link: https://lore.kernel.org/r/Y7Rs8GyV7g0nF5Yy@nixie71 Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/input/misc/iqs269a.c | 98 ++++++++++++++---------------------- 1 file changed, 39 insertions(+), 59 deletions(-)

diff --git a/drivers/input/misc/iqs269a.c b/drivers/input/misc/iqs269a.c index ea3401a1000f0..1530efd301c24 100644 --- a/drivers/input/misc/iqs269a.c +++ b/drivers/input/misc/iqs269a.c @@ -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);