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mfd: vexpress: Add pseudo-GPIO based LEDs

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The LEDs on the Versatile Express motherboard are controlled
through simple memory-mapped register. This patch extends
the pseudo-GPIO controller definition for these lines and
creates generic "leds-gpio" device using them

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Pawel Moll 2013-01-30 10:33:16 +00:00 committed by Samuel Ortiz
parent 151621a704
commit 8ea402f564
2 changed files with 63 additions and 18 deletions
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73
drivers/mfd/vexpress-sysreg.c
View File

@ -49,6 +49,8 @@
#define SYS_ID_HBI_SHIFT 16 #define SYS_ID_HBI_SHIFT 16
#define SYS_PROCIDx_HBI_SHIFT 0 #define SYS_PROCIDx_HBI_SHIFT 0
#define SYS_LED_LED(n) (1 << (n))
#define SYS_MCI_CARDIN (1 << 0) #define SYS_MCI_CARDIN (1 << 0)
#define SYS_MCI_WPROT (1 << 1) #define SYS_MCI_WPROT (1 << 1)
@ -348,22 +350,27 @@ void __init vexpress_sysreg_of_early_init(void)
} }
#define VEXPRESS_SYSREG_GPIO(_name, _reg, _value) \
[VEXPRESS_GPIO_##_name] = { \
.reg = _reg, \
.value = _reg##_##_value, \
}
static struct vexpress_sysreg_gpio { static struct vexpress_sysreg_gpio {
unsigned long reg; unsigned long reg;
u32 value; u32 value;
} vexpress_sysreg_gpios[] = { } vexpress_sysreg_gpios[] = {
[VEXPRESS_GPIO_MMC_CARDIN] = { VEXPRESS_SYSREG_GPIO(MMC_CARDIN, SYS_MCI, CARDIN),
.reg = SYS_MCI, VEXPRESS_SYSREG_GPIO(MMC_WPROT, SYS_MCI, WPROT),
.value = SYS_MCI_CARDIN, VEXPRESS_SYSREG_GPIO(FLASH_WPn, SYS_FLASH, WPn),
}, VEXPRESS_SYSREG_GPIO(LED0, SYS_LED, LED(0)),
[VEXPRESS_GPIO_MMC_WPROT] = { VEXPRESS_SYSREG_GPIO(LED1, SYS_LED, LED(1)),
.reg = SYS_MCI, VEXPRESS_SYSREG_GPIO(LED2, SYS_LED, LED(2)),
.value = SYS_MCI_WPROT, VEXPRESS_SYSREG_GPIO(LED3, SYS_LED, LED(3)),
}, VEXPRESS_SYSREG_GPIO(LED4, SYS_LED, LED(4)),
[VEXPRESS_GPIO_FLASH_WPn] = { VEXPRESS_SYSREG_GPIO(LED5, SYS_LED, LED(5)),
.reg = SYS_FLASH, VEXPRESS_SYSREG_GPIO(LED6, SYS_LED, LED(6)),
.value = SYS_FLASH_WPn, VEXPRESS_SYSREG_GPIO(LED7, SYS_LED, LED(7)),
},
}; };
static int vexpress_sysreg_gpio_direction_input(struct gpio_chip *chip, static int vexpress_sysreg_gpio_direction_input(struct gpio_chip *chip,
@ -372,12 +379,6 @@ static int vexpress_sysreg_gpio_direction_input(struct gpio_chip *chip,
return 0; return 0;
} }
static int vexpress_sysreg_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
return 0;
}
static int vexpress_sysreg_gpio_get(struct gpio_chip *chip, static int vexpress_sysreg_gpio_get(struct gpio_chip *chip,
unsigned offset) unsigned offset)
{ {
@ -401,6 +402,14 @@ static void vexpress_sysreg_gpio_set(struct gpio_chip *chip,
writel(reg_value, vexpress_sysreg_base + gpio->reg); writel(reg_value, vexpress_sysreg_base + gpio->reg);
} }
static int vexpress_sysreg_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
vexpress_sysreg_gpio_set(chip, offset, value);
return 0;
}
static struct gpio_chip vexpress_sysreg_gpio_chip = { static struct gpio_chip vexpress_sysreg_gpio_chip = {
.label = "vexpress-sysreg", .label = "vexpress-sysreg",
.direction_input = vexpress_sysreg_gpio_direction_input, .direction_input = vexpress_sysreg_gpio_direction_input,
@ -412,6 +421,30 @@ static struct gpio_chip vexpress_sysreg_gpio_chip = {
}; };
#define VEXPRESS_SYSREG_GREEN_LED(_name, _default_trigger, _gpio) \
{ \
.name = "v2m:green:"_name, \
.default_trigger = _default_trigger, \
.gpio = VEXPRESS_GPIO_##_gpio, \
}
struct gpio_led vexpress_sysreg_leds[] = {
VEXPRESS_SYSREG_GREEN_LED("user1", "heartbeat", LED0),
VEXPRESS_SYSREG_GREEN_LED("user2", "mmc0", LED1),
VEXPRESS_SYSREG_GREEN_LED("user3", "cpu0", LED2),
VEXPRESS_SYSREG_GREEN_LED("user4", "cpu1", LED3),
VEXPRESS_SYSREG_GREEN_LED("user5", "cpu2", LED4),
VEXPRESS_SYSREG_GREEN_LED("user6", "cpu3", LED5),
VEXPRESS_SYSREG_GREEN_LED("user7", "cpu4", LED6),
VEXPRESS_SYSREG_GREEN_LED("user8", "cpu5", LED7),
};
struct gpio_led_platform_data vexpress_sysreg_leds_pdata = {
.num_leds = ARRAY_SIZE(vexpress_sysreg_leds),
.leds = vexpress_sysreg_leds,
};
static ssize_t vexpress_sysreg_sys_id_show(struct device *dev, static ssize_t vexpress_sysreg_sys_id_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
@ -456,6 +489,10 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
return err; return err;
} }
platform_device_register_data(vexpress_sysreg_dev, "leds-gpio",
PLATFORM_DEVID_AUTO, &vexpress_sysreg_leds_pdata,
sizeof(vexpress_sysreg_leds_pdata));
vexpress_sysreg_dev = &pdev->dev; vexpress_sysreg_dev = &pdev->dev;
device_create_file(vexpress_sysreg_dev, &dev_attr_sys_id); device_create_file(vexpress_sysreg_dev, &dev_attr_sys_id);

8
include/linux/vexpress.h
View File

@ -27,6 +27,14 @@
#define VEXPRESS_GPIO_MMC_CARDIN 0 #define VEXPRESS_GPIO_MMC_CARDIN 0
#define VEXPRESS_GPIO_MMC_WPROT 1 #define VEXPRESS_GPIO_MMC_WPROT 1
#define VEXPRESS_GPIO_FLASH_WPn 2 #define VEXPRESS_GPIO_FLASH_WPn 2
#define VEXPRESS_GPIO_LED0 3
#define VEXPRESS_GPIO_LED1 4
#define VEXPRESS_GPIO_LED2 5
#define VEXPRESS_GPIO_LED3 6
#define VEXPRESS_GPIO_LED4 7
#define VEXPRESS_GPIO_LED5 8
#define VEXPRESS_GPIO_LED6 9
#define VEXPRESS_GPIO_LED7 10
#define VEXPRESS_RES_FUNC(_site, _func) \ #define VEXPRESS_RES_FUNC(_site, _func) \
{ \ { \