From 72bf7443ba618b9f7a3167c1f591a0dc00faeb2d Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Sun, 1 May 2016 18:44:55 -0400 Subject: [PATCH] gpio: 104-idi-48: Utilize the ISA bus driver 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 Cc: Alexandre Courbot Signed-off-by: William Breathitt Gray Signed-off-by: Greg Kroah-Hartman --- drivers/gpio/Kconfig | 10 +++-- drivers/gpio/gpio-104-idi-48.c | 86 ++++++++++++++---------------------------- 2 files changed, 34 insertions(+), 62 deletions(-) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 5aca476..c96ef58 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -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" diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c index e37cd4c..6c75c83 100644 --- a/drivers/gpio/gpio-104-idi-48.c +++ b/drivers/gpio/gpio-104-idi-48.c @@ -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 #include @@ -19,18 +22,23 @@ #include #include #include +#include #include #include #include -#include #include -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 "); MODULE_DESCRIPTION("ACCES 104-IDI-48 GPIO driver"); -- 2.7.4