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gpio: 104-idi-48: Utilize the ISA bus driver

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The ACCES 104-IDI-48 series communicates via the ISA bus. As such, it
is more appropriate to use the ISA bus driver over the platform driver
to control the ACCES 104-IDI-48 GPIO driver.

This patch also adds support for multiple devices via the base and irq
module array parameters. Each element of the base array corresponds to a
discrete device; each element of the irq array corresponds to the
respective device addressed in the respective base array element.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
William Breathitt Gray 2016-05-01 18:44:55 -04:00 committed by Greg Kroah-Hartman
parent 4c23db0f9f
commit 72bf7443ba
2 changed files with 34 additions and 62 deletions
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10
drivers/gpio/Kconfig
View File

@ -536,12 +536,14 @@ config GPIO_104_IDIO_16
config GPIO_104_IDI_48
tristate "ACCES 104-IDI-48 GPIO support"
depends on ISA
select GPIOLIB_IRQCHIP
help
Enables GPIO support for the ACCES 104-IDI-48 family. The base port
address for the device may be configured via the idi_48_base module
parameter. The interrupt line number for the device may be configured
via the idi_48_irq module parameter.
Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
the devices may be configured via the base module parameter. The
interrupt line numbers for the devices may be configured via the irq
module parameter.
config GPIO_F7188X
tristate "F71869, F71869A, F71882FG, F71889F and F81866 GPIO support"

86
drivers/gpio/gpio-104-idi-48.c
View File

@ -10,6 +10,9 @@
* 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.
*
* This driver supports the following ACCES devices: 104-IDI-48A,
* 104-IDI-48AC, 104-IDI-48B, and 104-IDI-48BC.
*/
#include <linux/bitops.h>
#include <linux/device.h>
@ -19,18 +22,23 @@
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/irqdesc.h>
#include <linux/isa.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
static unsigned idi_48_base;
module_param(idi_48_base, uint, 0);
MODULE_PARM_DESC(idi_48_base, "ACCES 104-IDI-48 base address");
static unsigned idi_48_irq;
module_param(idi_48_irq, uint, 0);
MODULE_PARM_DESC(idi_48_irq, "ACCES 104-IDI-48 interrupt line number");
#define IDI_48_EXTENT 8
#define MAX_NUM_IDI_48 max_num_isa_dev(IDI_48_EXTENT)
static unsigned int base[MAX_NUM_IDI_48];
static unsigned int num_idi_48;
module_param_array(base, uint, &num_idi_48, 0);
MODULE_PARM_DESC(base, "ACCES 104-IDI-48 base addresses");
static unsigned int irq[MAX_NUM_IDI_48];
module_param_array(irq, uint, NULL, 0);
MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers");
/**
* struct idi_48_gpio - GPIO device private data structure
@ -211,23 +219,19 @@ static irqreturn_t idi_48_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int __init idi_48_probe(struct platform_device *pdev)
static int idi_48_probe(struct device *dev, unsigned int id)
{
struct device *dev = &pdev->dev;
struct idi_48_gpio *idi48gpio;
const unsigned base = idi_48_base;
const unsigned extent = 8;
const char *const name = dev_name(dev);
int err;
const unsigned irq = idi_48_irq;
idi48gpio = devm_kzalloc(dev, sizeof(*idi48gpio), GFP_KERNEL);
if (!idi48gpio)
return -ENOMEM;
if (!devm_request_region(dev, base, extent, name)) {
if (!devm_request_region(dev, base[id], IDI_48_EXTENT, name)) {
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
base, base + extent);
base[id], base[id] + IDI_48_EXTENT);
return -EBUSY;
}
@ -239,8 +243,8 @@ static int __init idi_48_probe(struct platform_device *pdev)
idi48gpio->chip.get_direction = idi_48_gpio_get_direction;
idi48gpio->chip.direction_input = idi_48_gpio_direction_input;
idi48gpio->chip.get = idi_48_gpio_get;
idi48gpio->base = base;
idi48gpio->irq = irq;
idi48gpio->base = base[id];
idi48gpio->irq = irq[id];
spin_lock_init(&idi48gpio->lock);
@ -253,8 +257,8 @@ static int __init idi_48_probe(struct platform_device *pdev)
}
/* Disable IRQ by default */
outb(0, base + 7);
inb(base + 7);
outb(0, base[id] + 7);
inb(base[id] + 7);
err = gpiochip_irqchip_add(&idi48gpio->chip, &idi_48_irqchip, 0,
handle_edge_irq, IRQ_TYPE_NONE);
@ -263,7 +267,7 @@ static int __init idi_48_probe(struct platform_device *pdev)
goto err_gpiochip_remove;
}
err = request_irq(irq, idi_48_irq_handler, IRQF_SHARED, name,
err = request_irq(irq[id], idi_48_irq_handler, IRQF_SHARED, name,
idi48gpio);
if (err) {
dev_err(dev, "IRQ handler registering failed (%d)\n", err);
@ -277,9 +281,9 @@ err_gpiochip_remove:
return err;
}
static int idi_48_remove(struct platform_device *pdev)
static int idi_48_remove(struct device *dev, unsigned int id)
{
struct idi_48_gpio *const idi48gpio = platform_get_drvdata(pdev);
struct idi_48_gpio *const idi48gpio = dev_get_drvdata(dev);
free_irq(idi48gpio->irq, idi48gpio);
gpiochip_remove(&idi48gpio->chip);
@ -287,48 +291,14 @@ static int idi_48_remove(struct platform_device *pdev)
return 0;
}
static struct platform_device *idi_48_device;
static struct platform_driver idi_48_driver = {
static struct isa_driver idi_48_driver = {
.probe = idi_48_probe,
.driver = {
.name = "104-idi-48"
},
.remove = idi_48_remove
};
static void __exit idi_48_exit(void)
{
platform_device_unregister(idi_48_device);
platform_driver_unregister(&idi_48_driver);
}
static int __init idi_48_init(void)
{
int err;
idi_48_device = platform_device_alloc(idi_48_driver.driver.name, -1);
if (!idi_48_device)
return -ENOMEM;
err = platform_device_add(idi_48_device);
if (err)
goto err_platform_device;
err = platform_driver_probe(&idi_48_driver, idi_48_probe);
if (err)
goto err_platform_driver;
return 0;
err_platform_driver:
platform_device_del(idi_48_device);
err_platform_device:
platform_device_put(idi_48_device);
return err;
}
module_init(idi_48_init);
module_exit(idi_48_exit);
module_isa_driver(idi_48_driver, num_idi_48);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("ACCES 104-IDI-48 GPIO driver");