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Message-ID: <fd4ed9e6c0bbc9b63d1744974071c7e5@bootlin.com>
Date: Fri, 19 Apr 2024 14:32:04 +0200
From: Kamel BOUHARA <kamel.bouhara@...tlin.com>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring
<robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
Henrik Rydberg <rydberg@...math.org>, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, Jeff LaBundy
<jeff@...undy.com>, catalin.popescu@...ca-geosystems.com,
mark.satterthwaite@...chnetix.com, Thomas Petazzoni
<thomas.petazzoni@...tlin.com>, Gregory Clement
<gregory.clement@...tlin.com>, bsp-development.geo@...ca-geosystems.com
Subject: Re: [PATCH v10 3/3] Input: Add TouchNetix axiom i2c touchscreen
driver
Le 2024-04-19 11:28, Marco Felsch a écrit :
> Hi Kamel,
>
Hi,
> thank you for the patch. Again just a rough review.
>
> On 24-04-19, Kamel Bouhara wrote:
>> Add a new driver for the TouchNetix's axiom family of
>> touchscreen controllers. This driver only supports i2c
>> and can be later adapted for SPI and USB support.
>>
>> Signed-off-by: Kamel Bouhara <kamel.bouhara@...tlin.com>
>> ---
>
> ...
>
>> +static int axiom_i2c_probe(struct i2c_client *client)
>> +{
>> + struct device *dev = &client->dev;
>> + struct input_dev *input_dev;
>> + struct axiom_data *ts;
>> + u32 poll_interval;
>> + int target;
>> + int error;
>> +
>> + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
>> + if (!ts)
>> + return -ENOMEM;
>> +
>> + i2c_set_clientdata(client, ts);
>> + ts->client = client;
>> + ts->dev = dev;
>> +
>> + ts->regmap = devm_regmap_init_i2c(client, &axiom_i2c_regmap_config);
>> + error = PTR_ERR_OR_ZERO(ts->regmap);
>> + if (error) {
>> + dev_err(dev, "Failed to initialize regmap: %d\n", error);
>> + return error;
>> + }
>> +
>> + ts->vddi = devm_regulator_get(dev, "VDDI");
>
> This does not match the dt-bindings.
>
>> + if (IS_ERR(ts->vddi))
>> + return dev_err_probe(&client->dev, PTR_ERR(ts->vddi),
>> + "Failed to enable VDDI regulator\n");
>> +
>> + ts->vdda = devm_regulator_get(dev, "VDDA");
>
> Here as well.
>
>> + if (IS_ERR(ts->vdda))
>> + return dev_err_probe(&client->dev, PTR_ERR(ts->vdda),
>> + "Failed to enable VDDA regulator\n");
>
> Now we handle it as always but..
>
>> + ts->reset_gpio = devm_gpiod_get_optional(dev, "reset",
>> GPIOD_OUT_HIGH);
>> + if (IS_ERR(ts->reset_gpio))
>> + return dev_err_probe(dev, PTR_ERR(ts->reset_gpio), "failed to get
>> reset GPIO\n");
>> +
>> + if (ts->reset_gpio)
>> + axiom_reset(ts->reset_gpio);
>> + else
>> + msleep(AXIOM_STARTUP_TIME_MS);
>
> still the reset is useless since you never enabled the regulators. So
> either use devm_regulator_get_enable() or you do the enable/disable
> separate via regulator_enable()/disable(). If there are no strict
> enablement restrictions like orders and timings you could also make use
> of the regulator_bulk API (e.g. devm_regulator_bulk_get_enable).
I will just go with the devm_regulator_get_enable() solution in v11,
regulator have to be enabled
before reset is asserted here.
Thanks again!
Kamel
>
> Regards,
> Marco
>
>> +
>> + error = axiom_discover(ts);
>> + if (error)
>> + return dev_err_probe(dev, error, "Failed touchscreen discover\n");
>> +
>> + input_dev = devm_input_allocate_device(ts->dev);
>> + if (!input_dev)
>> + return -ENOMEM;
>> +
>> + input_dev->name = "TouchNetix axiom Touchscreen";
>> + input_dev->phys = "input/axiom_ts";
>> +
>> + input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, 65535, 0, 0);
>> + input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, 65535, 0, 0);
>> + input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE, 0, MT_TOOL_MAX, 0,
>> 0);
>> + input_set_abs_params(input_dev, ABS_MT_DISTANCE, 0, 127, 0, 0);
>> + input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 127, 0, 0);
>> +
>> + touchscreen_parse_properties(input_dev, true, &ts->prop);
>> +
>> + /* Registers the axiom device as a touchscreen instead of a mouse
>> pointer */
>> + error = input_mt_init_slots(input_dev, AXIOM_U41_MAX_TARGETS,
>> INPUT_MT_DIRECT);
>> + if (error)
>> + return error;
>> +
>> + /* Enables the raw data for up to 4 force channels to be sent to the
>> input subsystem */
>> + set_bit(EV_REL, input_dev->evbit);
>> + set_bit(EV_MSC, input_dev->evbit);
>> + /* Declare that we support "RAW" Miscellaneous events */
>> + set_bit(MSC_RAW, input_dev->mscbit);
>> +
>> + ts->input_dev = input_dev;
>> + input_set_drvdata(ts->input_dev, ts);
>> +
>> + /* Ensure that all reports are initialised to not be present. */
>> + for (target = 0; target < AXIOM_U41_MAX_TARGETS; target++)
>> + ts->targets[target].state = AXIOM_TARGET_STATE_NOT_PRESENT;
>> +
>> + error = devm_request_threaded_irq(dev, client->irq, NULL,
>> + axiom_irq, IRQF_ONESHOT, dev_name(dev), ts);
>> + if (error) {
>> + dev_info(dev, "Request irq failed, falling back to polling mode");
>> +
>> + error = input_setup_polling(input_dev, axiom_i2c_poll);
>> + if (error)
>> + return dev_err_probe(ts->dev, error, "Unable to set up polling
>> mode\n");
>> +
>> + if (!device_property_read_u32(ts->dev, "poll-interval",
>> &poll_interval))
>> + input_set_poll_interval(input_dev, poll_interval);
>> + else
>> + input_set_poll_interval(input_dev, POLL_INTERVAL_DEFAULT_MS);
>> + }
>> +
>> + return input_register_device(input_dev);
>> +}
>> +
>> +static const struct i2c_device_id axiom_i2c_id_table[] = {
>> + { "ax54a" },
>> + { },
>> +};
>> +MODULE_DEVICE_TABLE(i2c, axiom_i2c_id_table);
>> +
>> +static const struct of_device_id axiom_i2c_of_match[] = {
>> + { .compatible = "touchnetix,ax54a", },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, axiom_i2c_of_match);
>> +
>> +static struct i2c_driver axiom_i2c_driver = {
>> + .driver = {
>> + .name = "axiom",
>> + .of_match_table = axiom_i2c_of_match,
>> + },
>> + .id_table = axiom_i2c_id_table,
>> + .probe = axiom_i2c_probe,
>> +};
>> +module_i2c_driver(axiom_i2c_driver);
>> +
>> +MODULE_AUTHOR("Bart Prescott <bartp@...sheep.co.uk>");
>> +MODULE_AUTHOR("Pedro Torruella <pedro.torruella@...chnetix.com>");
>> +MODULE_AUTHOR("Mark Satterthwaite
>> <mark.satterthwaite@...chnetix.com>");
>> +MODULE_AUTHOR("Hannah Rossiter <hannah.rossiter@...chnetix.com>");
>> +MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@...tlin.com>");
>> +MODULE_DESCRIPTION("TouchNetix axiom touchscreen I2C bus driver");
>> +MODULE_LICENSE("GPL");
>> --
>> 2.25.1
>>
>>
--
--
Kamel Bouhara, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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