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gpio: 104-idio-16: Utilize the ISA bus driver

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The ACCES 104-IDIO-16 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-IDIO-16 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 18:45:11 -04:00 committed by Greg Kroah-Hartman
parent 72bf7443ba
commit 86ea8a95a4
2 changed files with 34 additions and 61 deletions
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10
drivers/gpio/Kconfig
View file

@ -527,12 +527,14 @@ config GPIO_104_DIO_48E
config GPIO_104_IDIO_16
tristate "ACCES 104-IDIO-16 GPIO support"
depends on ISA
select GPIOLIB_IRQCHIP
help
Enables GPIO support for the ACCES 104-IDIO-16 family. The base port
address for the device may be set via the idio_16_base module
parameter. The interrupt line number for the device may be set via the
idio_16_irq module parameter.
Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). 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_104_IDI_48
tristate "ACCES 104-IDI-48 GPIO support"

85
drivers/gpio/gpio-104-idio-16.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-IDIO-16,
* 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
*/
#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 idio_16_base;
module_param(idio_16_base, uint, 0);
MODULE_PARM_DESC(idio_16_base, "ACCES 104-IDIO-16 base address");
static unsigned idio_16_irq;
module_param(idio_16_irq, uint, 0);
MODULE_PARM_DESC(idio_16_irq, "ACCES 104-IDIO-16 interrupt line number");
#define IDIO_16_EXTENT 8
#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
static unsigned int base[MAX_NUM_IDIO_16];
static unsigned int num_idio_16;
module_param_array(base, uint, &num_idio_16, 0);
MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
static unsigned int irq[MAX_NUM_IDIO_16];
module_param_array(irq, uint, NULL, 0);
MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
/**
* struct idio_16_gpio - GPIO device private data structure
@ -185,23 +193,19 @@ static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int __init idio_16_probe(struct platform_device *pdev)
static int idio_16_probe(struct device *dev, unsigned int id)
{
struct device *dev = &pdev->dev;
struct idio_16_gpio *idio16gpio;
const unsigned base = idio_16_base;
const unsigned extent = 8;
const char *const name = dev_name(dev);
int err;
const unsigned irq = idio_16_irq;
idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
if (!idio16gpio)
return -ENOMEM;
if (!devm_request_region(dev, base, extent, name)) {
if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
base, base + extent);
base[id], base[id] + IDIO_16_EXTENT);
return -EBUSY;
}
@ -215,8 +219,8 @@ static int __init idio_16_probe(struct platform_device *pdev)
idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
idio16gpio->chip.get = idio_16_gpio_get;
idio16gpio->chip.set = idio_16_gpio_set;
idio16gpio->base = base;
idio16gpio->irq = irq;
idio16gpio->base = base[id];
idio16gpio->irq = irq[id];
idio16gpio->out_state = 0xFFFF;
spin_lock_init(&idio16gpio->lock);
@ -230,8 +234,8 @@ static int __init idio_16_probe(struct platform_device *pdev)
}
/* Disable IRQ by default */
outb(0, base + 2);
outb(0, base + 1);
outb(0, base[id] + 2);
outb(0, base[id] + 1);
err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
handle_edge_irq, IRQ_TYPE_NONE);
@ -240,7 +244,7 @@ static int __init idio_16_probe(struct platform_device *pdev)
goto err_gpiochip_remove;
}
err = request_irq(irq, idio_16_irq_handler, 0, name, idio16gpio);
err = request_irq(irq[id], idio_16_irq_handler, 0, name, idio16gpio);
if (err) {
dev_err(dev, "IRQ handler registering failed (%d)\n", err);
goto err_gpiochip_remove;
@ -253,9 +257,9 @@ static int __init idio_16_probe(struct platform_device *pdev)
return err;
}
static int idio_16_remove(struct platform_device *pdev)
static int idio_16_remove(struct device *dev, unsigned int id)
{
struct idio_16_gpio *const idio16gpio = platform_get_drvdata(pdev);
struct idio_16_gpio *const idio16gpio = dev_get_drvdata(dev);
free_irq(idio16gpio->irq, idio16gpio);
gpiochip_remove(&idio16gpio->chip);
@ -263,48 +267,15 @@ static int idio_16_remove(struct platform_device *pdev)
return 0;
}
static struct platform_device *idio_16_device;
static struct platform_driver idio_16_driver = {
static struct isa_driver idio_16_driver = {
.probe = idio_16_probe,
.driver = {
.name = "104-idio-16"
},
.remove = idio_16_remove
};
static void __exit idio_16_exit(void)
{
platform_device_unregister(idio_16_device);
platform_driver_unregister(&idio_16_driver);
}
static int __init idio_16_init(void)
{
int err;
idio_16_device = platform_device_alloc(idio_16_driver.driver.name, -1);
if (!idio_16_device)
return -ENOMEM;
err = platform_device_add(idio_16_device);
if (err)
goto err_platform_device;
err = platform_driver_probe(&idio_16_driver, idio_16_probe);
if (err)
goto err_platform_driver;
return 0;
err_platform_driver:
platform_device_del(idio_16_device);
err_platform_device:
platform_device_put(idio_16_device);
return err;
}
module_init(idio_16_init);
module_exit(idio_16_exit);
module_isa_driver(idio_16_driver, num_idio_16);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");