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Message-ID: <2dfe0504525b7eae9fb8bfb3bd28bb4e@trvn.ru>
Date: Tue, 16 Jul 2024 12:32:11 +0500
From: Nikita Travkin <nikita@...n.ru>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
Michael Srba <Michael.Srba@...nam.cz>, Linus Walleij
<linus.walleij@...aro.org>, linux-input@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH RESEND v4 2/2] input: zinitix: Add touchkey support
Dmitry Torokhov писал(а) 16.07.2024 10:45:
> Hi Nikita,
>
> On Sat, Jul 13, 2024 at 08:28:09PM +0500, Nikita Travkin wrote:
>> Zinitix touch controllers can use some of the sense lines for virtual
>> keys (like those found on many phones). Add support for those keys.
>>
>> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Nikita Travkin <nikita@...n.ru>
>
> A few comments:
>
>> ---
>> drivers/input/touchscreen/zinitix.c | 61 +++++++++++++++++++++++++++++++++++--
>> 1 file changed, 58 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
>> index 1b4807ba4624..75390d67689e 100644
>> --- a/drivers/input/touchscreen/zinitix.c
>> +++ b/drivers/input/touchscreen/zinitix.c
>> @@ -119,6 +119,7 @@
>>
>> #define DEFAULT_TOUCH_POINT_MODE 2
>> #define MAX_SUPPORTED_FINGER_NUM 5
>> +#define MAX_SUPPORTED_BUTTON_NUM 8
>>
>> #define CHIP_ON_DELAY 15 // ms
>> #define FIRMWARE_ON_DELAY 40 // ms
>> @@ -146,6 +147,8 @@ struct bt541_ts_data {
>> struct touchscreen_properties prop;
>> struct regulator_bulk_data supplies[2];
>> u32 zinitix_mode;
>> + u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
>> + int num_keycodes;
>> };
>>
>> static int zinitix_read_data(struct i2c_client *client,
>> @@ -195,6 +198,7 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>> struct i2c_client *client = bt541->client;
>> int i;
>> int error;
>> + u16 int_flags = 0;
>
> It is initialized unconditionally below, no need to initialize here.
>
>>
>> error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
>> if (error) {
>> @@ -225,6 +229,11 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>> if (error)
>> return error;
>>
>> + error = zinitix_write_u16(client, ZINITIX_BUTTON_SUPPORTED_NUM,
>> + bt541->num_keycodes);
>> + if (error)
>> + return error;
>> +
>> error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
>> bt541->zinitix_mode);
>> if (error)
>> @@ -235,9 +244,12 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>> if (error)
>> return error;
>>
>> - error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG,
>> - BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE |
>> - BIT_UP);
>> + int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
>> +
>
> Drop empty line.
>
>> + if (bt541->num_keycodes)
>> + int_flags |= BIT_ICON_EVENT;
>> +
>> + error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, int_flags);
>> if (error)
>> return error;
>>
>> @@ -350,6 +362,15 @@ static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
>> }
>> }
>>
>> +static void zinitix_report_keys(struct bt541_ts_data *bt541, u16 icon_events)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < bt541->num_keycodes; i++)
>> + input_report_key(bt541->input_dev,
>> + bt541->keycodes[i], !!(icon_events & BIT(i)));
>> +}
>> +
>> static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>> {
>> struct bt541_ts_data *bt541 = bt541_handler;
>> @@ -358,6 +379,7 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>> unsigned long finger_mask;
>> int error;
>> int i;
>> + __le16 icon_events = 0;
>
> I do not believe this needs to be initialized.
>
>>
>> memset(&touch_event, 0, sizeof(struct touch_event));
>>
>> @@ -368,6 +390,17 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>> goto out;
>> }
>>
>> + if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
>> + error = zinitix_read_data(bt541->client, ZINITIX_ICON_STATUS_REG,
>> + &icon_events, sizeof(icon_events));
>> + if (error) {
>> + dev_err(&client->dev, "Failed to read icon events\n");
>> + goto out;
>> + }
>> +
>> + zinitix_report_keys(bt541, le16_to_cpu(icon_events));
>> + }
>> +
>> finger_mask = touch_event.finger_mask;
>> for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
>> const struct point_coord *p = &touch_event.point_coord[i];
>> @@ -453,6 +486,7 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>> {
>> struct input_dev *input_dev;
>> int error;
>> + int i;
>>
>> input_dev = devm_input_allocate_device(&bt541->client->dev);
>> if (!input_dev) {
>> @@ -470,6 +504,14 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>> input_dev->open = zinitix_input_open;
>> input_dev->close = zinitix_input_close;
>>
>> + if (bt541->num_keycodes) {
>> + input_dev->keycode = bt541->keycodes;
>> + input_dev->keycodemax = bt541->num_keycodes;
>> + input_dev->keycodesize = sizeof(bt541->keycodes[0]);
>> + for (i = 0; i < bt541->num_keycodes; i++)
>> + input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
>> + }
>> +
>> input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
>> input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
>> input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
>> @@ -534,6 +576,19 @@ static int zinitix_ts_probe(struct i2c_client *client)
>> return error;
>> }
>>
>> + bt541->num_keycodes = of_property_read_variable_u32_array(
>> + client->dev.of_node, "linux,keycodes",
>> + bt541->keycodes, 0,
>> + ARRAY_SIZE(bt541->keycodes));
>
> Please use generic device properties (device_property_*). There is no
> equivalent for "read variable" so you'll need 2 calls, one to figure out
> the array size and another one to read it.
>
> See drivers/input/keyboard/mpr121_touchkey.c for an example.
>
Ack, will switch to using device_property_ and fix all the above
suggestions in v5.
Thanks for your review!
Nikita
>> + if (bt541->num_keycodes == -EINVAL) {
>> + bt541->num_keycodes = 0;
>> + } else if (bt541->num_keycodes < 0) {
>> + dev_err(&client->dev,
>> + "Unable to parse \"linux,keycodes\" property: %d\n",
>> + bt541->num_keycodes);
>> + return bt541->num_keycodes;
>> + }
>> +
>> error = zinitix_init_input_dev(bt541);
>> if (error) {
>> dev_err(&client->dev,
>>
>> --
>> 2.45.2
>>
>
> Thanks.
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