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cs5535-gpio: request function, mask & names added 

Changed number of gpio pins to 32 (according to datasheet)

Added mask to disable some pins

Added gpio_request for checking mask and disabling special pin functions

Added pin names

[dilinger@collabora.co.uk: make printk usage consistent]
Signed-off-by: Tobias Mueller <Tobias_Mueller@twam.info>
Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: David Brownell <david-b@pacbell.net>
Cc: Alessandro Zummo <alessandro.zummo@towertech.it>
Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tobias Mueller 2009-12-14 18:00:35 -08:00 committed by Linus Torvalds
parent 5f0a96b044
commit 1ea3fa7bbf
1 changed files with 78 additions and 5 deletions
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83
drivers/gpio/cs5535-gpio.c
View File

@ -19,6 +19,29 @@
#define DRV_NAME "cs5535-gpio"
#define GPIO_BAR 1
/*
* Some GPIO pins
* 31-29,23 : reserved (always mask out)
* 28 : Power Button
* 26 : PME#
* 22-16 : LPC
* 14,15 : SMBus
* 9,8 : UART1
* 7 : PCI INTB
* 3,4 : UART2/DDC
* 2 : IDE_IRQ0
* 1 : AC_BEEP
* 0 : PCI INTA
*
* If a mask was not specified, allow all except
* reserved and Power Button
*/
#define GPIO_DEFAULT_MASK 0x0F7FFFFF
static ulong mask = GPIO_DEFAULT_MASK;
module_param_named(mask, mask, ulong, 0444);
MODULE_PARM_DESC(mask, "GPIO channel mask.");
static struct cs5535_gpio_chip {
struct gpio_chip chip;
resource_size_t base;
@ -102,6 +125,33 @@ EXPORT_SYMBOL_GPL(cs5535_gpio_isset);
* Generic gpio_chip API support.
*/
static int chip_gpio_request(struct gpio_chip *c, unsigned offset)
{
struct cs5535_gpio_chip *chip = (struct cs5535_gpio_chip *) c;
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
/* check if this pin is available */
if ((mask & (1 << offset)) == 0) {
dev_info(&chip->pdev->dev,
"pin %u is not available (check mask)\n", offset);
spin_unlock_irqrestore(&chip->lock, flags);
return -EINVAL;
}
/* disable output aux 1 & 2 on this pin */
__cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_AUX1);
__cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_AUX2);
/* disable input aux 1 on this pin */
__cs5535_gpio_clear(chip, offset, GPIO_INPUT_AUX1);
spin_unlock_irqrestore(&chip->lock, flags);
return 0;
}
static int chip_gpio_get(struct gpio_chip *chip, unsigned offset)
{
return cs5535_gpio_isset(offset, GPIO_OUTPUT_VAL);
@ -145,13 +195,26 @@ static int chip_direction_output(struct gpio_chip *c, unsigned offset, int val)
return 0;
}
static char *cs5535_gpio_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3",
"GPIO4", "GPIO5", "GPIO6", "GPIO7",
"GPIO8", "GPIO9", "GPIO10", "GPIO11",
"GPIO12", "GPIO13", "GPIO14", "GPIO15",
"GPIO16", "GPIO17", "GPIO18", "GPIO19",
"GPIO20", "GPIO21", "GPIO22", NULL,
"GPIO24", "GPIO25", "GPIO26", "GPIO27",
"GPIO28", NULL, NULL, NULL,
};
static struct cs5535_gpio_chip cs5535_gpio_chip = {
.chip = {
.owner = THIS_MODULE,
.label = DRV_NAME,
.base = 0,
.ngpio = 28,
.ngpio = 32,
.names = cs5535_gpio_names,
.request = chip_gpio_request,
.get = chip_gpio_get,
.set = chip_gpio_set,
@ -165,6 +228,7 @@ static int __init cs5535_gpio_probe(struct pci_dev *pdev,
const struct pci_device_id *pci_id)
{
int err;
ulong mask_orig = mask;
/* There are two ways to get the GPIO base address; one is by
* fetching it from MSR_LBAR_GPIO, the other is by reading the
@ -193,14 +257,23 @@ static int __init cs5535_gpio_probe(struct pci_dev *pdev,
dev_info(&pdev->dev, "allocated PCI BAR #%d: base 0x%llx\n", GPIO_BAR,
(unsigned long long) cs5535_gpio_chip.base);
/* mask out reserved pins */
mask &= 0x1F7FFFFF;
/* do not allow pin 28, Power Button, as there's special handling
* in the PMC needed. (note 12, p. 48) */
mask &= ~(1 << 28);
if (mask_orig != mask)
dev_info(&pdev->dev, "mask changed from 0x%08lX to 0x%08lX\n",
mask_orig, mask);
/* finally, register with the generic GPIO API */
err = gpiochip_add(&cs5535_gpio_chip.chip);
if (err) {
dev_err(&pdev->dev, "failed to register gpio chip\n");
if (err)
goto release_region;
}
printk(KERN_INFO DRV_NAME ": GPIO support successfully loaded.\n");
dev_info(&pdev->dev, DRV_NAME ": GPIO support successfully loaded.\n");
return 0;
release_region: