// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2015, The Linux Foundation. All rights reserved. * * GPIO and pin control functions on this SOC are handled by the "TLMM" * device. The driver which controls this device is pinctrl-msm.c. Each * SOC with a TLMM is expected to create a client driver that registers * with pinctrl-msm.c. This means that all TLMM drivers are pin control * drivers. * * This pin control driver is intended to be used only an ACPI-enabled * system. As such, UEFI will handle all pin control configuration, so * this driver does not provide pin control functions. It is effectively * a GPIO-only driver. The alternative is to duplicate the GPIO code of * pinctrl-msm.c into another driver.
*/
/* A maximum of 256 allows us to use a u8 array to hold the GPIO numbers */ #define MAX_GPIOS 256
/* maximum size of each gpio name (enough room for "gpioXXX" + null) */ #define NAME_SIZE 8
staticint qdf2xxx_pinctrl_probe(struct platform_device *pdev)
{ struct msm_pinctrl_soc_data *pinctrl; struct pinctrl_pin_desc *pins; struct msm_pingroup *groups; char (*names)[NAME_SIZE]; unsignedint i;
u32 num_gpios; unsignedint avail_gpios; /* The number of GPIOs we support */
u8 gpios[MAX_GPIOS]; /* An array of supported GPIOs */ int ret;
/* Query the number of GPIOs from ACPI */
ret = device_property_read_u32(&pdev->dev, "num-gpios", &num_gpios); if (ret < 0) {
dev_err(&pdev->dev, "missing 'num-gpios' property\n"); return ret;
} if (!num_gpios || num_gpios > MAX_GPIOS) {
dev_err(&pdev->dev, "invalid 'num-gpios' property\n"); return -ENODEV;
}
/* The number of GPIOs in the approved list */
ret = device_property_count_u8(&pdev->dev, "gpios"); if (ret < 0) {
dev_err(&pdev->dev, "missing 'gpios' property\n"); return ret;
} /* * The number of available GPIOs should be non-zero, and no * more than the total number of GPIOS.
*/ if (!ret || ret > num_gpios) {
dev_err(&pdev->dev, "invalid 'gpios' property\n"); return -ENODEV;
}
avail_gpios = ret;
ret = device_property_read_u8_array(&pdev->dev, "gpios", gpios,
avail_gpios); if (ret < 0) {
dev_err(&pdev->dev, "could not read list of GPIOs\n"); return ret;
}
if (!pinctrl || !pins || !groups || !names) return -ENOMEM;
/* * Initialize the array. GPIOs not listed in the 'gpios' array * still need a number, but nothing else.
*/ for (i = 0; i < num_gpios; i++) {
pins[i].number = i;
groups[i].grp.pins = &pins[i].number;
}
/* Populate the entries that are meant to be exposed as GPIOs. */ for (i = 0; i < avail_gpios; i++) { unsignedint gpio = gpios[i];
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.