mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 06:24:53 +08:00
c5a4b6fd31
This patch implements the GPIO function of Intel USB-I2C/GPIO/SPI adapter device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA GPIO module with specific protocol through interfaces exported by LJCA USB driver. Signed-off-by: Ye Xiang <xiang.ye@intel.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20230225140118.2037220-3-xiang.ye@intel.com
455 lines
13 KiB
C
455 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Intel La Jolla Cove Adapter USB-GPIO driver
|
|
*
|
|
* Copyright (c) 2023, Intel Corporation.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/bitfield.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/dev_printk.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/mfd/ljca.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
/* GPIO commands */
|
|
#define LJCA_GPIO_CONFIG 1
|
|
#define LJCA_GPIO_READ 2
|
|
#define LJCA_GPIO_WRITE 3
|
|
#define LJCA_GPIO_INT_EVENT 4
|
|
#define LJCA_GPIO_INT_MASK 5
|
|
#define LJCA_GPIO_INT_UNMASK 6
|
|
|
|
#define LJCA_GPIO_CONF_DISABLE BIT(0)
|
|
#define LJCA_GPIO_CONF_INPUT BIT(1)
|
|
#define LJCA_GPIO_CONF_OUTPUT BIT(2)
|
|
#define LJCA_GPIO_CONF_PULLUP BIT(3)
|
|
#define LJCA_GPIO_CONF_PULLDOWN BIT(4)
|
|
#define LJCA_GPIO_CONF_DEFAULT BIT(5)
|
|
#define LJCA_GPIO_CONF_INTERRUPT BIT(6)
|
|
#define LJCA_GPIO_INT_TYPE BIT(7)
|
|
|
|
#define LJCA_GPIO_CONF_EDGE FIELD_PREP(LJCA_GPIO_INT_TYPE, 1)
|
|
#define LJCA_GPIO_CONF_LEVEL FIELD_PREP(LJCA_GPIO_INT_TYPE, 0)
|
|
|
|
/* Intentional overlap with PULLUP / PULLDOWN */
|
|
#define LJCA_GPIO_CONF_SET BIT(3)
|
|
#define LJCA_GPIO_CONF_CLR BIT(4)
|
|
|
|
struct gpio_op {
|
|
u8 index;
|
|
u8 value;
|
|
} __packed;
|
|
|
|
struct gpio_packet {
|
|
u8 num;
|
|
struct gpio_op item[];
|
|
} __packed;
|
|
|
|
#define LJCA_GPIO_BUF_SIZE 60
|
|
struct ljca_gpio_dev {
|
|
struct platform_device *pdev;
|
|
struct gpio_chip gc;
|
|
struct ljca_gpio_info *gpio_info;
|
|
DECLARE_BITMAP(unmasked_irqs, LJCA_MAX_GPIO_NUM);
|
|
DECLARE_BITMAP(enabled_irqs, LJCA_MAX_GPIO_NUM);
|
|
DECLARE_BITMAP(reenable_irqs, LJCA_MAX_GPIO_NUM);
|
|
u8 *connect_mode;
|
|
/* mutex to protect irq bus */
|
|
struct mutex irq_lock;
|
|
struct work_struct work;
|
|
/* lock to protect package transfer to Hardware */
|
|
struct mutex trans_lock;
|
|
|
|
u8 obuf[LJCA_GPIO_BUF_SIZE];
|
|
u8 ibuf[LJCA_GPIO_BUF_SIZE];
|
|
};
|
|
|
|
static int gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, u8 config)
|
|
{
|
|
struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
|
|
int ret;
|
|
|
|
mutex_lock(&ljca_gpio->trans_lock);
|
|
packet->item[0].index = gpio_id;
|
|
packet->item[0].value = config | ljca_gpio->connect_mode[gpio_id];
|
|
packet->num = 1;
|
|
|
|
ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_CONFIG, packet,
|
|
struct_size(packet, item, packet->num), NULL, NULL);
|
|
mutex_unlock(&ljca_gpio->trans_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int ljca_gpio_read(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id)
|
|
{
|
|
struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
|
|
struct gpio_packet *ack_packet = (struct gpio_packet *)ljca_gpio->ibuf;
|
|
unsigned int ibuf_len = LJCA_GPIO_BUF_SIZE;
|
|
int ret;
|
|
|
|
mutex_lock(&ljca_gpio->trans_lock);
|
|
packet->num = 1;
|
|
packet->item[0].index = gpio_id;
|
|
ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_READ, packet,
|
|
struct_size(packet, item, packet->num), ljca_gpio->ibuf, &ibuf_len);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
if (!ibuf_len || ack_packet->num != packet->num) {
|
|
dev_err(&ljca_gpio->pdev->dev, "failed gpio_id:%u %u", gpio_id, ack_packet->num);
|
|
ret = -EIO;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&ljca_gpio->trans_lock);
|
|
if (ret)
|
|
return ret;
|
|
return ack_packet->item[0].value > 0;
|
|
}
|
|
|
|
static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id,
|
|
int value)
|
|
{
|
|
struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
|
|
int ret;
|
|
|
|
mutex_lock(&ljca_gpio->trans_lock);
|
|
packet->num = 1;
|
|
packet->item[0].index = gpio_id;
|
|
packet->item[0].value = value & 1;
|
|
|
|
ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_WRITE, packet,
|
|
struct_size(packet, item, packet->num), NULL, NULL);
|
|
mutex_unlock(&ljca_gpio->trans_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int ljca_gpio_get_value(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
|
|
return ljca_gpio_read(ljca_gpio, offset);
|
|
}
|
|
|
|
static void ljca_gpio_set_value(struct gpio_chip *chip, unsigned int offset,
|
|
int val)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
int ret;
|
|
|
|
ret = ljca_gpio_write(ljca_gpio, offset, val);
|
|
if (ret)
|
|
dev_err(chip->parent, "offset:%u val:%d set value failed %d\n", offset, val, ret);
|
|
}
|
|
|
|
static int ljca_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned int offset)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
u8 config = LJCA_GPIO_CONF_INPUT | LJCA_GPIO_CONF_CLR;
|
|
|
|
return gpio_config(ljca_gpio, offset, config);
|
|
}
|
|
|
|
static int ljca_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned int offset, int val)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
u8 config = LJCA_GPIO_CONF_OUTPUT | LJCA_GPIO_CONF_CLR;
|
|
int ret;
|
|
|
|
ret = gpio_config(ljca_gpio, offset, config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ljca_gpio_set_value(chip, offset, val);
|
|
return 0;
|
|
}
|
|
|
|
static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
|
|
unsigned long config)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
|
|
ljca_gpio->connect_mode[offset] = 0;
|
|
switch (pinconf_to_config_param(config)) {
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLUP;
|
|
break;
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLDOWN;
|
|
break;
|
|
case PIN_CONFIG_DRIVE_PUSH_PULL:
|
|
case PIN_CONFIG_PERSIST_STATE:
|
|
break;
|
|
default:
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
|
|
unsigned int ngpios)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
|
|
|
|
WARN_ON_ONCE(ngpios != ljca_gpio->gpio_info->num);
|
|
bitmap_copy(valid_mask, ljca_gpio->gpio_info->valid_pin_map, ngpios);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ljca_gpio_irq_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
|
|
unsigned int ngpios)
|
|
{
|
|
ljca_gpio_init_valid_mask(chip, valid_mask, ngpios);
|
|
}
|
|
|
|
static int ljca_enable_irq(struct ljca_gpio_dev *ljca_gpio, int gpio_id, bool enable)
|
|
{
|
|
struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
|
|
int ret;
|
|
|
|
mutex_lock(&ljca_gpio->trans_lock);
|
|
packet->num = 1;
|
|
packet->item[0].index = gpio_id;
|
|
packet->item[0].value = 0;
|
|
|
|
ret = ljca_transfer(ljca_gpio->gpio_info->ljca,
|
|
enable ? LJCA_GPIO_INT_UNMASK : LJCA_GPIO_INT_MASK, packet,
|
|
struct_size(packet, item, packet->num), NULL, NULL);
|
|
mutex_unlock(&ljca_gpio->trans_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void ljca_gpio_async(struct work_struct *work)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = container_of(work, struct ljca_gpio_dev, work);
|
|
int gpio_id;
|
|
int unmasked;
|
|
|
|
for_each_set_bit(gpio_id, ljca_gpio->reenable_irqs, ljca_gpio->gc.ngpio) {
|
|
clear_bit(gpio_id, ljca_gpio->reenable_irqs);
|
|
unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs);
|
|
if (unmasked)
|
|
ljca_enable_irq(ljca_gpio, gpio_id, true);
|
|
}
|
|
}
|
|
|
|
static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, int len)
|
|
{
|
|
const struct gpio_packet *packet = evt_data;
|
|
struct ljca_gpio_dev *ljca_gpio = context;
|
|
int i;
|
|
int irq;
|
|
|
|
if (cmd != LJCA_GPIO_INT_EVENT)
|
|
return;
|
|
|
|
for (i = 0; i < packet->num; i++) {
|
|
irq = irq_find_mapping(ljca_gpio->gc.irq.domain, packet->item[i].index);
|
|
if (!irq) {
|
|
dev_err(ljca_gpio->gc.parent, "gpio_id %u does not mapped to IRQ yet\n",
|
|
packet->item[i].index);
|
|
return;
|
|
}
|
|
|
|
generic_handle_domain_irq(ljca_gpio->gc.irq.domain, irq);
|
|
set_bit(packet->item[i].index, ljca_gpio->reenable_irqs);
|
|
}
|
|
|
|
schedule_work(&ljca_gpio->work);
|
|
}
|
|
|
|
static void ljca_irq_unmask(struct irq_data *irqd)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
|
|
int gpio_id = irqd_to_hwirq(irqd);
|
|
|
|
gpiochip_enable_irq(gc, gpio_id);
|
|
set_bit(gpio_id, ljca_gpio->unmasked_irqs);
|
|
}
|
|
|
|
static void ljca_irq_mask(struct irq_data *irqd)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
|
|
int gpio_id = irqd_to_hwirq(irqd);
|
|
|
|
clear_bit(gpio_id, ljca_gpio->unmasked_irqs);
|
|
gpiochip_disable_irq(gc, gpio_id);
|
|
}
|
|
|
|
static int ljca_irq_set_type(struct irq_data *irqd, unsigned int type)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
|
|
int gpio_id = irqd_to_hwirq(irqd);
|
|
|
|
ljca_gpio->connect_mode[gpio_id] = LJCA_GPIO_CONF_INTERRUPT;
|
|
switch (type) {
|
|
case IRQ_TYPE_LEVEL_HIGH:
|
|
ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLUP);
|
|
break;
|
|
case IRQ_TYPE_LEVEL_LOW:
|
|
ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLDOWN);
|
|
break;
|
|
case IRQ_TYPE_EDGE_BOTH:
|
|
break;
|
|
case IRQ_TYPE_EDGE_RISING:
|
|
ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLUP);
|
|
break;
|
|
case IRQ_TYPE_EDGE_FALLING:
|
|
ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLDOWN);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ljca_irq_bus_lock(struct irq_data *irqd)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
|
|
|
|
mutex_lock(&ljca_gpio->irq_lock);
|
|
}
|
|
|
|
static void ljca_irq_bus_unlock(struct irq_data *irqd)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
|
|
struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
|
|
int gpio_id = irqd_to_hwirq(irqd);
|
|
int enabled;
|
|
int unmasked;
|
|
|
|
enabled = test_bit(gpio_id, ljca_gpio->enabled_irqs);
|
|
unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs);
|
|
|
|
if (enabled != unmasked) {
|
|
if (unmasked) {
|
|
gpio_config(ljca_gpio, gpio_id, 0);
|
|
ljca_enable_irq(ljca_gpio, gpio_id, true);
|
|
set_bit(gpio_id, ljca_gpio->enabled_irqs);
|
|
} else {
|
|
ljca_enable_irq(ljca_gpio, gpio_id, false);
|
|
clear_bit(gpio_id, ljca_gpio->enabled_irqs);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&ljca_gpio->irq_lock);
|
|
}
|
|
|
|
static const struct irq_chip ljca_gpio_irqchip = {
|
|
.name = "ljca-irq",
|
|
.irq_mask = ljca_irq_mask,
|
|
.irq_unmask = ljca_irq_unmask,
|
|
.irq_set_type = ljca_irq_set_type,
|
|
.irq_bus_lock = ljca_irq_bus_lock,
|
|
.irq_bus_sync_unlock = ljca_irq_bus_unlock,
|
|
.flags = IRQCHIP_IMMUTABLE,
|
|
GPIOCHIP_IRQ_RESOURCE_HELPERS,
|
|
};
|
|
|
|
static int ljca_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio;
|
|
struct gpio_irq_chip *girq;
|
|
int ret;
|
|
|
|
ljca_gpio = devm_kzalloc(&pdev->dev, sizeof(*ljca_gpio), GFP_KERNEL);
|
|
if (!ljca_gpio)
|
|
return -ENOMEM;
|
|
|
|
ljca_gpio->gpio_info = dev_get_platdata(&pdev->dev);
|
|
ljca_gpio->connect_mode = devm_kcalloc(&pdev->dev, ljca_gpio->gpio_info->num,
|
|
sizeof(*ljca_gpio->connect_mode), GFP_KERNEL);
|
|
if (!ljca_gpio->connect_mode)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&ljca_gpio->irq_lock);
|
|
mutex_init(&ljca_gpio->trans_lock);
|
|
ljca_gpio->pdev = pdev;
|
|
ljca_gpio->gc.direction_input = ljca_gpio_direction_input;
|
|
ljca_gpio->gc.direction_output = ljca_gpio_direction_output;
|
|
ljca_gpio->gc.get = ljca_gpio_get_value;
|
|
ljca_gpio->gc.set = ljca_gpio_set_value;
|
|
ljca_gpio->gc.set_config = ljca_gpio_set_config;
|
|
ljca_gpio->gc.init_valid_mask = ljca_gpio_init_valid_mask;
|
|
ljca_gpio->gc.can_sleep = true;
|
|
ljca_gpio->gc.parent = &pdev->dev;
|
|
|
|
ljca_gpio->gc.base = -1;
|
|
ljca_gpio->gc.ngpio = ljca_gpio->gpio_info->num;
|
|
ljca_gpio->gc.label = ACPI_COMPANION(&pdev->dev) ?
|
|
acpi_dev_name(ACPI_COMPANION(&pdev->dev)) :
|
|
dev_name(&pdev->dev);
|
|
ljca_gpio->gc.owner = THIS_MODULE;
|
|
|
|
platform_set_drvdata(pdev, ljca_gpio);
|
|
ljca_register_event_cb(ljca_gpio->gpio_info->ljca, ljca_gpio_event_cb, ljca_gpio);
|
|
|
|
girq = &ljca_gpio->gc.irq;
|
|
gpio_irq_chip_set_chip(girq, &ljca_gpio_irqchip);
|
|
girq->parent_handler = NULL;
|
|
girq->num_parents = 0;
|
|
girq->parents = NULL;
|
|
girq->default_type = IRQ_TYPE_NONE;
|
|
girq->handler = handle_simple_irq;
|
|
girq->init_valid_mask = ljca_gpio_irq_init_valid_mask;
|
|
|
|
INIT_WORK(&ljca_gpio->work, ljca_gpio_async);
|
|
ret = gpiochip_add_data(&ljca_gpio->gc, ljca_gpio);
|
|
if (ret) {
|
|
ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
|
|
mutex_destroy(&ljca_gpio->irq_lock);
|
|
mutex_destroy(&ljca_gpio->trans_lock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ljca_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct ljca_gpio_dev *ljca_gpio = platform_get_drvdata(pdev);
|
|
|
|
gpiochip_remove(&ljca_gpio->gc);
|
|
ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
|
|
mutex_destroy(&ljca_gpio->irq_lock);
|
|
mutex_destroy(&ljca_gpio->trans_lock);
|
|
return 0;
|
|
}
|
|
|
|
#define LJCA_GPIO_DRV_NAME "ljca-gpio"
|
|
static const struct platform_device_id ljca_gpio_id[] = {
|
|
{ LJCA_GPIO_DRV_NAME, 0 },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, ljca_gpio_id);
|
|
|
|
static struct platform_driver ljca_gpio_driver = {
|
|
.driver.name = LJCA_GPIO_DRV_NAME,
|
|
.probe = ljca_gpio_probe,
|
|
.remove = ljca_gpio_remove,
|
|
};
|
|
module_platform_driver(ljca_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
|
|
MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>");
|
|
MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
|
|
MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-GPIO driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_IMPORT_NS(LJCA);
|