diff options
Diffstat (limited to 'drivers/gpio/gpio-ich.c')
| -rw-r--r-- | drivers/gpio/gpio-ich.c | 73 |
1 files changed, 25 insertions, 48 deletions
diff --git a/drivers/gpio/gpio-ich.c b/drivers/gpio/gpio-ich.c index dba392221042..90bf7742f9b0 100644 --- a/drivers/gpio/gpio-ich.c +++ b/drivers/gpio/gpio-ich.c @@ -1,32 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * Intel ICH6-10, Series 5 and 6, Atom C2000 (Avoton/Rangeley) GPIO driver * * Copyright (C) 2010 Extreme Engineering Solutions. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/bitops.h> +#include <linux/gpio/driver.h> #include <linux/ioport.h> +#include <linux/mfd/lpc_ich.h> #include <linux/module.h> #include <linux/pci.h> -#include <linux/gpio/driver.h> #include <linux/platform_device.h> -#include <linux/mfd/lpc_ich.h> -#include <linux/bitops.h> #define DRV_NAME "gpio_ich" @@ -100,7 +86,7 @@ struct ichx_desc { static struct { spinlock_t lock; - struct platform_device *dev; + struct device *dev; struct gpio_chip chip; struct resource *gpio_base; /* GPIO IO base */ struct resource *pm_base; /* Power Mangagment IO base */ @@ -112,8 +98,7 @@ static struct { static int modparam_gpiobase = -1; /* dynamic */ module_param_named(gpiobase, modparam_gpiobase, int, 0444); -MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, " - "which is the default."); +MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default."); static int ichx_write_bit(int reg, unsigned nr, int val, int verify) { @@ -121,7 +106,6 @@ static int ichx_write_bit(int reg, unsigned nr, int val, int verify) u32 data, tmp; int reg_nr = nr / 32; int bit = nr & 0x1f; - int ret = 0; spin_lock_irqsave(&ichx_priv.lock, flags); @@ -142,12 +126,10 @@ static int ichx_write_bit(int reg, unsigned nr, int val, int verify) tmp = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr], ichx_priv.gpio_base); - if (verify && data != tmp) - ret = -EPERM; spin_unlock_irqrestore(&ichx_priv.lock, flags); - return ret; + return (verify && data != tmp) ? -EPERM : 0; } static int ichx_read_bit(int reg, unsigned nr) @@ -186,10 +168,7 @@ static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) * Try setting pin as an input and verify it worked since many pins * are output-only. */ - if (ichx_write_bit(GPIO_IO_SEL, nr, 1, 1)) - return -EINVAL; - - return 0; + return ichx_write_bit(GPIO_IO_SEL, nr, 1, 1); } static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, @@ -206,10 +185,7 @@ static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, * Try setting pin as an output and verify it worked since many pins * are input-only. */ - if (ichx_write_bit(GPIO_IO_SEL, nr, 0, 1)) - return -EINVAL; - - return 0; + return ichx_write_bit(GPIO_IO_SEL, nr, 0, 1); } static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr) @@ -284,7 +260,7 @@ static void ichx_gpiolib_setup(struct gpio_chip *chip) { chip->owner = THIS_MODULE; chip->label = DRV_NAME; - chip->parent = &ichx_priv.dev->dev; + chip->parent = ichx_priv.dev; /* Allow chip-specific overrides of request()/get() */ chip->request = ichx_priv.desc->request ? @@ -407,15 +383,14 @@ static int ichx_gpio_request_regions(struct device *dev, static int ichx_gpio_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; + struct lpc_ich_info *ich_info = dev_get_platdata(dev); struct resource *res_base, *res_pm; int err; - struct lpc_ich_info *ich_info = dev_get_platdata(&pdev->dev); if (!ich_info) return -ENODEV; - ichx_priv.dev = pdev; - switch (ich_info->gpio_version) { case ICH_I3100_GPIO: ichx_priv.desc = &i3100_desc; @@ -445,19 +420,21 @@ static int ichx_gpio_probe(struct platform_device *pdev) return -ENODEV; } + ichx_priv.dev = dev; spin_lock_init(&ichx_priv.lock); + res_base = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPIO); - ichx_priv.use_gpio = ich_info->use_gpio; - err = ichx_gpio_request_regions(&pdev->dev, res_base, pdev->name, - ichx_priv.use_gpio); + err = ichx_gpio_request_regions(dev, res_base, pdev->name, + ich_info->use_gpio); if (err) return err; ichx_priv.gpio_base = res_base; + ichx_priv.use_gpio = ich_info->use_gpio; /* * If necessary, determine the I/O address of ACPI/power management - * registers which are needed to read the the GPE0 register for GPI pins + * registers which are needed to read the GPE0 register for GPI pins * 0 - 15 on some chipsets. */ if (!ichx_priv.desc->uses_gpe0) @@ -465,13 +442,13 @@ static int ichx_gpio_probe(struct platform_device *pdev) res_pm = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPE0); if (!res_pm) { - pr_warn("ACPI BAR is unavailable, GPI 0 - 15 unavailable\n"); + dev_warn(dev, "ACPI BAR is unavailable, GPI 0 - 15 unavailable\n"); goto init; } - if (!devm_request_region(&pdev->dev, res_pm->start, - resource_size(res_pm), pdev->name)) { - pr_warn("ACPI BAR is busy, GPI 0 - 15 unavailable\n"); + if (!devm_request_region(dev, res_pm->start, resource_size(res_pm), + pdev->name)) { + dev_warn(dev, "ACPI BAR is busy, GPI 0 - 15 unavailable\n"); goto init; } @@ -481,12 +458,12 @@ init: ichx_gpiolib_setup(&ichx_priv.chip); err = gpiochip_add_data(&ichx_priv.chip, NULL); if (err) { - pr_err("Failed to register GPIOs\n"); + dev_err(dev, "Failed to register GPIOs\n"); return err; } - pr_info("GPIO from %d to %d on %s\n", ichx_priv.chip.base, - ichx_priv.chip.base + ichx_priv.chip.ngpio - 1, DRV_NAME); + dev_info(dev, "GPIO from %d to %d\n", ichx_priv.chip.base, + ichx_priv.chip.base + ichx_priv.chip.ngpio - 1); return 0; } |