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Message-ID: <9c5ed5ee-7ca1-c1f4-5d9d-a63b4327a4af@redhat.com>
Date: Thu, 20 Jan 2022 17:17:50 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Stefan Binding <sbinding@...nsource.cirrus.com>,
Mark Brown <broonie@...nel.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>, Mark Gross <markgross@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
linux-spi@...r.kernel.org, linux-acpi@...r.kernel.org,
platform-driver-x86@...r.kernel.org, patches@...nsource.cirrus.com,
Lucas Tanure <tanureal@...nsource.cirrus.com>
Subject: Re: [PATCH v4 6/9] platform/x86: bus-multi-instantiate: Reorganize
I2C functions
Hi,
Sorry some more remarks after all...
On 1/20/22 14:43, Stefan Binding wrote:
> From: Lucas Tanure <tanureal@...nsource.cirrus.com>
>
> Reorganize I2C functions to accommodate SPI support
> Split the probe and factor out parts of the code
> that will be used in the SPI support
>
> Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
> Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
> ---
> drivers/platform/x86/bus-multi-instantiate.c | 150 ++++++++++++-------
> 1 file changed, 96 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/platform/x86/bus-multi-instantiate.c b/drivers/platform/x86/bus-multi-instantiate.c
> index 982dfecfd27c..50f1540762e9 100644
> --- a/drivers/platform/x86/bus-multi-instantiate.c
> +++ b/drivers/platform/x86/bus-multi-instantiate.c
> @@ -29,85 +29,129 @@ struct bmi_instance {
>
> struct bmi {
> int i2c_num;
> - struct i2c_client *i2c_devs[];
> + struct i2c_client **i2c_devs;
> };
>
> -static int bmi_probe(struct platform_device *pdev)
> +static int bmi_get_irq(struct platform_device *pdev, struct acpi_device *adev,
> + const struct bmi_instance *inst)
> +{
> + int ret;
> +
> + switch (inst->flags & IRQ_RESOURCE_TYPE) {
> + case IRQ_RESOURCE_GPIO:
> + ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
> + break;
> + case IRQ_RESOURCE_APIC:
> + ret = platform_get_irq(pdev, inst->irq_idx);
> + break;
> + default:
> + ret = 0;
> + break;
> + }
> +
> + if (ret < 0)
> + dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d: %d\n",
> + inst->irq_idx, ret);
> +
> + return ret;
> +}
> +
> +static void bmi_devs_unregister(struct bmi *bmi)
> +{
> + while (bmi->i2c_num > 0)
> + i2c_unregister_device(bmi->i2c_devs[--bmi->i2c_num]);
> +}
> +
> +/**
> + * bmi_i2c_probe - Instantiate multiple I2C devices from inst array
> + * @pdev: Platform device
> + * @adev: ACPI device
> + * @bmi: Internal struct for Bus multi instantiate driver
> + * @inst: Array of instances to probe
> + *
> + * Returns the number of I2C devices instantiate, Zero if none is found or a negative error code.
> + */
> +static int bmi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev, struct bmi *bmi,
> + const struct bmi_instance *inst_array)
> {
> struct i2c_board_info board_info = {};
> - const struct bmi_instance *inst;
> struct device *dev = &pdev->dev;
> - struct acpi_device *adev;
> - struct bmi *bmi;
> char name[32];
> - int i, ret;
> + int i, ret = 0, count;
>
> - inst = device_get_match_data(dev);
> - if (!inst) {
> - dev_err(dev, "Error ACPI match data is missing\n");
> - return -ENODEV;
> - }
> -
> - adev = ACPI_COMPANION(dev);
> -
> - /* Count number of clients to instantiate */
> ret = i2c_acpi_client_count(adev);
> - if (ret < 0)
> + if (ret <= 0)
> return ret;
Please change this to:
return ret == 0 ? -ENODEV : ret;
This helps making return value handler in the caller cleaner,
also see my upcoming review of patch 7/9.
> + count = ret;
>
> - bmi = devm_kmalloc(dev, struct_size(bmi, i2c_devs, ret), GFP_KERNEL);
> - if (!bmi)
> + bmi->i2c_devs = devm_kcalloc(dev, count, sizeof(*bmi->i2c_devs), GFP_KERNEL);
> + if (!bmi->i2c_devs)
> return -ENOMEM;
>
> - bmi->i2c_num = ret;
> -
> - for (i = 0; i < bmi->i2c_num && inst[i].type; i++) {
> + for (i = 0; i < count && inst_array[i].type; i++) {
> memset(&board_info, 0, sizeof(board_info));
> - strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
> - snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
> + strscpy(board_info.type, inst_array[i].type, I2C_NAME_SIZE);
> + snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i);
> board_info.dev_name = name;
> - switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
> - case IRQ_RESOURCE_GPIO:
> - ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
> - if (ret < 0) {
> - dev_err(dev, "Error requesting irq at index %d: %d\n",
> - inst[i].irq_idx, ret);
> - goto error;
> - }
> - board_info.irq = ret;
> - break;
> - case IRQ_RESOURCE_APIC:
> - ret = platform_get_irq(pdev, inst[i].irq_idx);
> - if (ret < 0) {
> - dev_dbg(dev, "Error requesting irq at index %d: %d\n",
> - inst[i].irq_idx, ret);
> - goto error;
> - }
> - board_info.irq = ret;
> - break;
> - default:
> - board_info.irq = 0;
> - break;
> - }
> +
> + ret = bmi_get_irq(pdev, adev, &inst_array[i]);
> + if (ret < 0)
> + goto error;
> + board_info.irq = ret;
> +
> bmi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
> if (IS_ERR(bmi->i2c_devs[i])) {
> ret = dev_err_probe(dev, PTR_ERR(bmi->i2c_devs[i]),
> "Error creating i2c-client, idx %d\n", i);
> goto error;
> }
> + bmi->i2c_num++;
> }
> - if (i < bmi->i2c_num) {
> + if (bmi->i2c_num < count) {
> dev_err(dev, "Error finding driver, idx %d\n", i);
> ret = -ENODEV;
> goto error;
> }
>
> - platform_set_drvdata(pdev, bmi);
> - return 0;
> + dev_info(dev, "Instantiate %d I2C devices.\n", bmi->i2c_num);
>
> + return bmi->i2c_num;
And change this to return 0.
> error:
> - while (--i >= 0)
> - i2c_unregister_device(bmi->i2c_devs[i]);
> + dev_err_probe(dev, ret, "I2C error %d\n", ret);
> + bmi_devs_unregister(bmi);
> +
> + return ret;
> +}
> +
> +static int bmi_probe(struct platform_device *pdev)
> +{
> + const struct bmi_instance *inst_array;
> + struct device *dev = &pdev->dev;
> + struct acpi_device *adev;
> + struct bmi *bmi;
> + int ret;
> +
> + inst_array = device_get_match_data(dev);
> + if (!inst_array) {
> + dev_err(dev, "Error ACPI match data is missing\n");
> + return -ENODEV;
> + }
> +
> + adev = ACPI_COMPANION(dev);
> + if (!adev)
> + return -ENODEV;
> +
> + bmi = devm_kzalloc(dev, sizeof(*bmi), GFP_KERNEL);
> + if (!bmi)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, bmi);
> +
> + ret = bmi_i2c_probe(pdev, adev, bmi, inst_array);
> + if (ret > 0)
> + return 0;
> + if (ret == 0)
> + ret = -ENODEV;
>
> return ret;
Then you can simplify the above to just:
return bmi_i2c_probe(pdev, adev, bmi, inst_array);
:)
Regards,
Hans
> }
> @@ -115,10 +159,8 @@ static int bmi_probe(struct platform_device *pdev)
> static int bmi_remove(struct platform_device *pdev)
> {
> struct bmi *bmi = platform_get_drvdata(pdev);
> - int i;
>
> - for (i = 0; i < bmi->i2c_num; i++)
> - i2c_unregister_device(bmi->i2c_devs[i]);
> + bmi_devs_unregister(bmi);
>
> return 0;
> }
>
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