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Input: iqs269a - add support for OTP variants

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This patch adds support for each available OTP variant of the device.
The OTP configuration cannot be read over I2C, so it is derived from
a compatible string instead.

Early revisions of the D0 order code require their OTP-enabled func-
tionality to be manually restored following a soft reset; this patch
accommodates this erratum as well.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/ZZMaZbdk6iAKUjlm@nixie71
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jeff LaBundy 2024-01-01 14:02:45 -06:00 committed by Dmitry Torokhov
parent 56c083e3f5
commit 992bbc9e9a
1 changed files with 89 additions and 3 deletions
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92
drivers/input/misc/iqs269a.c
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@ -102,6 +102,11 @@
#define IQS269_MISC_B_TRACKING_UI_ENABLE BIT(4)
#define IQS269_MISC_B_FILT_STR_SLIDER GENMASK(1, 0)
#define IQS269_TOUCH_HOLD_SLIDER_SEL 0x89
#define IQS269_TOUCH_HOLD_DEFAULT 0x14
#define IQS269_TOUCH_HOLD_MS_MIN 256
#define IQS269_TOUCH_HOLD_MS_MAX 65280
#define IQS269_TIMEOUT_TAP_MS_MAX 4080
#define IQS269_TIMEOUT_SWIPE_MS_MAX 4080
#define IQS269_THRESH_SWIPE_MAX 255
@ -151,6 +156,10 @@
#define IQS269_MAX_REG 0xFF
#define IQS269_OTP_OPTION_DEFAULT 0x00
#define IQS269_OTP_OPTION_TWS 0xD0
#define IQS269_OTP_OPTION_HOLD BIT(7)
#define IQS269_NUM_CH 8
#define IQS269_NUM_SL 2
@ -315,6 +324,7 @@ struct iqs269_private {
struct input_dev *slider[IQS269_NUM_SL];
unsigned int keycode[ARRAY_SIZE(iqs269_events) * IQS269_NUM_CH];
unsigned int sl_code[IQS269_NUM_SL][IQS269_NUM_GESTURES];
unsigned int otp_option;
unsigned int ch_num;
bool hall_enable;
bool ati_current;
@ -325,6 +335,14 @@ static enum iqs269_slider_id iqs269_slider_type(struct iqs269_private *iqs269,
{
int i;
/*
* Slider 1 is unavailable if the touch-and-hold option is enabled via
* OTP. In that case, the channel selection register is repurposed for
* the touch-and-hold timer ceiling.
*/
if (slider_num && (iqs269->otp_option & IQS269_OTP_OPTION_HOLD))
return IQS269_SLIDER_NONE;
if (!iqs269->sys_reg.slider_select[slider_num])
return IQS269_SLIDER_NONE;
@ -565,7 +583,8 @@ static int iqs269_parse_chan(struct iqs269_private *iqs269,
if (fwnode_property_present(ch_node, "azoteq,slider0-select"))
iqs269->sys_reg.slider_select[0] |= BIT(reg);
if (fwnode_property_present(ch_node, "azoteq,slider1-select"))
if (fwnode_property_present(ch_node, "azoteq,slider1-select") &&
!(iqs269->otp_option & IQS269_OTP_OPTION_HOLD))
iqs269->sys_reg.slider_select[1] |= BIT(reg);
ch_reg = &iqs269->sys_reg.ch_reg[reg];
@ -990,7 +1009,43 @@ static int iqs269_parse_prop(struct iqs269_private *iqs269)
sys_reg->blocking = 0;
sys_reg->slider_select[0] = 0;
sys_reg->slider_select[1] = 0;
/*
* If configured via OTP to do so, the device asserts a pulse on the
* GPIO4 pin for approximately 60 ms once a selected channel is held
* in a state of touch for a configurable length of time.
*
* In that case, the register used for slider 1 channel selection is
* repurposed for the touch-and-hold timer ceiling.
*/
if (iqs269->otp_option & IQS269_OTP_OPTION_HOLD) {
if (!device_property_read_u32(&client->dev,
"azoteq,touch-hold-ms", &val)) {
if (val < IQS269_TOUCH_HOLD_MS_MIN ||
val > IQS269_TOUCH_HOLD_MS_MAX) {
dev_err(&client->dev,
"Invalid touch-and-hold ceiling: %u\n",
val);
return -EINVAL;
}
sys_reg->slider_select[1] = val / 256;
} else if (iqs269->ver_info.fw_num < IQS269_VER_INFO_FW_NUM_3) {
/*
* The default touch-and-hold timer ceiling initially
* read from early revisions of silicon is invalid if
* the device experienced a soft reset between power-
* on and the read operation.
*
* To protect against this case, explicitly cache the
* default value so that it is restored each time the
* device is re-initialized.
*/
sys_reg->slider_select[1] = IQS269_TOUCH_HOLD_DEFAULT;
}
} else {
sys_reg->slider_select[1] = 0;
}
sys_reg->event_mask = ~((u8)IQS269_EVENT_MASK_SYS);
@ -1137,12 +1192,30 @@ static int iqs269_parse_prop(struct iqs269_private *iqs269)
return 0;
}
static const struct reg_sequence iqs269_tws_init[] = {
{ IQS269_TOUCH_HOLD_SLIDER_SEL, IQS269_TOUCH_HOLD_DEFAULT },
{ 0xF0, 0x580F },
{ 0xF0, 0x59EF },
};
static int iqs269_dev_init(struct iqs269_private *iqs269)
{
int error;
mutex_lock(&iqs269->lock);
/*
* Early revisions of silicon require the following workaround in order
* to restore any OTP-enabled functionality after a soft reset.
*/
if (iqs269->otp_option == IQS269_OTP_OPTION_TWS &&
iqs269->ver_info.fw_num < IQS269_VER_INFO_FW_NUM_3) {
error = regmap_multi_reg_write(iqs269->regmap, iqs269_tws_init,
ARRAY_SIZE(iqs269_tws_init));
if (error)
goto err_mutex;
}
error = regmap_update_bits(iqs269->regmap, IQS269_HALL_UI,
IQS269_HALL_UI_ENABLE,
iqs269->hall_enable ? ~0 : 0);
@ -1779,6 +1852,8 @@ static int iqs269_probe(struct i2c_client *client)
mutex_init(&iqs269->lock);
init_completion(&iqs269->ati_done);
iqs269->otp_option = (uintptr_t)device_get_match_data(&client->dev);
error = regmap_raw_read(iqs269->regmap, IQS269_VER_INFO,
&iqs269->ver_info, sizeof(iqs269->ver_info));
if (error)
@ -1889,7 +1964,18 @@ static int iqs269_resume(struct device *dev)
static DEFINE_SIMPLE_DEV_PM_OPS(iqs269_pm, iqs269_suspend, iqs269_resume);
static const struct of_device_id iqs269_of_match[] = {
{ .compatible = "azoteq,iqs269a" },
{
.compatible = "azoteq,iqs269a",
.data = (void *)IQS269_OTP_OPTION_DEFAULT,
},
{
.compatible = "azoteq,iqs269a-00",
.data = (void *)IQS269_OTP_OPTION_DEFAULT,
},
{
.compatible = "azoteq,iqs269a-d0",
.data = (void *)IQS269_OTP_OPTION_TWS,
},
{ }
};
MODULE_DEVICE_TABLE(of, iqs269_of_match);