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/*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/acpi.h>
#include "pinctrl-msm.h"
/* 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
static int 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];
unsigned int i;
u32 num_gpios;
unsigned int 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_read_u8_array(&pdev->dev, "gpios", NULL, 0);
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;
}
pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
pins = devm_kcalloc(&pdev->dev, num_gpios,
sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
groups = devm_kcalloc(&pdev->dev, num_gpios,
sizeof(struct msm_pingroup), GFP_KERNEL);
names = devm_kcalloc(&pdev->dev, avail_gpios, NAME_SIZE, GFP_KERNEL);
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].pins = &pins[i].number;
}
/* Populate the entries that are meant to be exposed as GPIOs. */
for (i = 0; i < avail_gpios; i++) {
unsigned int gpio = gpios[i];
groups[gpio].npins = 1;
snprintf(names[i], NAME_SIZE, "gpio%u", gpio);
pins[gpio].name = names[i];
groups[gpio].name = names[i];
groups[gpio].ctl_reg = 0x10000 * gpio;
groups[gpio].io_reg = 0x04 + 0x10000 * gpio;
groups[gpio].intr_cfg_reg = 0x08 + 0x10000 * gpio;
groups[gpio].intr_status_reg = 0x0c + 0x10000 * gpio;
groups[gpio].intr_target_reg = 0x08 + 0x10000 * gpio;
groups[gpio].mux_bit = 2;
groups[gpio].pull_bit = 0;
groups[gpio].drv_bit = 6;
groups[gpio].oe_bit = 9;
groups[gpio].in_bit = 0;
groups[gpio].out_bit = 1;
groups[gpio].intr_enable_bit = 0;
groups[gpio].intr_status_bit = 0;
groups[gpio].intr_target_bit = 5;
groups[gpio].intr_target_kpss_val = 1;
groups[gpio].intr_raw_status_bit = 4;
groups[gpio].intr_polarity_bit = 1;
groups[gpio].intr_detection_bit = 2;
groups[gpio].intr_detection_width = 2;
}
pinctrl->pins = pins;
pinctrl->groups = groups;
pinctrl->npins = num_gpios;
pinctrl->ngroups = num_gpios;
pinctrl->ngpios = num_gpios;
return msm_pinctrl_probe(pdev, pinctrl);
}
static const struct acpi_device_id qdf2xxx_acpi_ids[] = {
{"QCOM8002"},
{},
};
MODULE_DEVICE_TABLE(acpi, qdf2xxx_acpi_ids);
static struct platform_driver qdf2xxx_pinctrl_driver = {
.driver = {
.name = "qdf2xxx-pinctrl",
.acpi_match_table = ACPI_PTR(qdf2xxx_acpi_ids),
},
.probe = qdf2xxx_pinctrl_probe,
.remove = msm_pinctrl_remove,
};
static int __init qdf2xxx_pinctrl_init(void)
{
return platform_driver_register(&qdf2xxx_pinctrl_driver);
}
arch_initcall(qdf2xxx_pinctrl_init);
static void __exit qdf2xxx_pinctrl_exit(void)
{
platform_driver_unregister(&qdf2xxx_pinctrl_driver);
}
module_exit(qdf2xxx_pinctrl_exit);
MODULE_DESCRIPTION("Qualcomm Technologies QDF2xxx pin control driver");
MODULE_LICENSE("GPL v2");
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