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linux-sg2042/drivers/leds/leds-mlxcpld.c

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/*
* drivers/leds/leds-mlxcpld.c
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define MLXPLAT_CPLD_LPC_REG_BASE_ADRR 0x2500 /* LPC bus access */
/* Color codes for LEDs */
#define MLXCPLD_LED_OFFSET_HALF 0x01 /* Offset from solid: 3Hz blink */
#define MLXCPLD_LED_OFFSET_FULL 0x02 /* Offset from solid: 6Hz blink */
#define MLXCPLD_LED_IS_OFF 0x00 /* Off */
#define MLXCPLD_LED_RED_STATIC_ON 0x05 /* Solid red */
#define MLXCPLD_LED_RED_BLINK_HALF (MLXCPLD_LED_RED_STATIC_ON + \
MLXCPLD_LED_OFFSET_HALF)
#define MLXCPLD_LED_RED_BLINK_FULL (MLXCPLD_LED_RED_STATIC_ON + \
MLXCPLD_LED_OFFSET_FULL)
#define MLXCPLD_LED_GREEN_STATIC_ON 0x0D /* Solid green */
#define MLXCPLD_LED_GREEN_BLINK_HALF (MLXCPLD_LED_GREEN_STATIC_ON + \
MLXCPLD_LED_OFFSET_HALF)
#define MLXCPLD_LED_GREEN_BLINK_FULL (MLXCPLD_LED_GREEN_STATIC_ON + \
MLXCPLD_LED_OFFSET_FULL)
#define MLXCPLD_LED_BLINK_3HZ 167 /* ~167 msec off/on */
#define MLXCPLD_LED_BLINK_6HZ 83 /* ~83 msec off/on */
/**
* struct mlxcpld_param - LED access parameters:
* @offset: offset for LED access in CPLD device
* @mask: mask for LED access in CPLD device
* @base_color: base color code for LED
**/
struct mlxcpld_param {
u8 offset;
u8 mask;
u8 base_color;
};
/**
* struct mlxcpld_led_priv - LED private data:
* @cled: LED class device instance
* @param: LED CPLD access parameters
**/
struct mlxcpld_led_priv {
struct led_classdev cdev;
struct mlxcpld_param param;
};
#define cdev_to_priv(c) container_of(c, struct mlxcpld_led_priv, cdev)
/**
* struct mlxcpld_led_profile - system LED profile (defined per system class):
* @offset: offset for LED access in CPLD device
* @mask: mask for LED access in CPLD device
* @base_color: base color code
* @brightness: default brightness setting (on/off)
* @name: LED name
**/
struct mlxcpld_led_profile {
u8 offset;
u8 mask;
u8 base_color;
enum led_brightness brightness;
const char *name;
};
/**
* struct mlxcpld_led_pdata - system LED private data
* @pdev: platform device pointer
* @pled: LED class device instance
* @profile: system configuration profile
* @num_led_instances: number of LED instances
* @lock: device access lock
**/
struct mlxcpld_led_pdata {
struct platform_device *pdev;
struct mlxcpld_led_priv *pled;
struct mlxcpld_led_profile *profile;
int num_led_instances;
spinlock_t lock;
};
static struct mlxcpld_led_pdata *mlxcpld_led;
/* Default profile fit the next Mellanox systems:
* "msx6710", "msx6720", "msb7700", "msn2700", "msx1410",
* "msn2410", "msb7800", "msn2740"
*/
static struct mlxcpld_led_profile mlxcpld_led_default_profile[] = {
{
0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:fan1:green",
},
{
0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:fan1:red",
},
{
0x21, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:fan2:green",
},
{
0x21, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:fan2:red",
},
{
0x22, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:fan3:green",
},
{
0x22, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:fan3:red",
},
{
0x22, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:fan4:green",
},
{
0x22, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:fan4:red",
},
{
0x20, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:psu:green",
},
{
0x20, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:psu:red",
},
{
0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:status:green",
},
{
0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:status:red",
},
};
/* Profile fit the Mellanox systems based on "msn2100" */
static struct mlxcpld_led_profile mlxcpld_led_msn2100_profile[] = {
{
0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:fan:green",
},
{
0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:fan:red",
},
{
0x23, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:psu1:green",
},
{
0x23, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:psu1:red",
},
{
0x23, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:psu2:green",
},
{
0x23, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:psu2:red",
},
{
0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
"mlxcpld:status:green",
},
{
0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
"mlxcpld:status:red",
},
{
0x24, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, LED_OFF,
"mlxcpld:uid:blue",
},
};
enum mlxcpld_led_platform_types {
MLXCPLD_LED_PLATFORM_DEFAULT,
MLXCPLD_LED_PLATFORM_MSN2100,
};
static const char *mlx_product_names[] = {
"DEFAULT",
"MSN2100",
};
static enum
mlxcpld_led_platform_types mlxcpld_led_platform_check_sys_type(void)
{
const char *mlx_product_name;
int i;
mlx_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
if (!mlx_product_name)
return MLXCPLD_LED_PLATFORM_DEFAULT;
for (i = 1; i < ARRAY_SIZE(mlx_product_names); i++) {
if (strstr(mlx_product_name, mlx_product_names[i]))
return i;
}
return MLXCPLD_LED_PLATFORM_DEFAULT;
}
static void mlxcpld_led_bus_access_func(u16 base, u8 offset, u8 rw_flag,
u8 *data)
{
u32 addr = base + offset;
if (rw_flag == 0)
outb(*data, addr);
else
*data = inb(addr);
}
static void mlxcpld_led_store_hw(u8 mask, u8 off, u8 vset)
{
u8 nib, val;
/*
* Each LED is controlled through low or high nibble of the relevant
* CPLD register. Register offset is specified by off parameter.
* Parameter vset provides color code: 0x0 for off, 0x5 for solid red,
* 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink
* green.
* Parameter mask specifies which nibble is used for specific LED: mask
* 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -
* higher nibble (bits from 4 to 7).
*/
spin_lock(&mlxcpld_led->lock);
mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 1,
&val);
nib = (mask == 0xf0) ? vset : (vset << 4);
val = (val & mask) | nib;
mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 0,
&val);
spin_unlock(&mlxcpld_led->lock);
}
static void mlxcpld_led_brightness_set(struct led_classdev *led,
enum led_brightness value)
{
struct mlxcpld_led_priv *pled = cdev_to_priv(led);
if (value) {
mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
pled->param.base_color);
return;
}
mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
MLXCPLD_LED_IS_OFF);
}
static int mlxcpld_led_blink_set(struct led_classdev *led,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct mlxcpld_led_priv *pled = cdev_to_priv(led);
/*
* HW supports two types of blinking: full (6Hz) and half (3Hz).
* For delay on/off zero default setting 3Hz is used.
*/
if (!(*delay_on == 0 && *delay_off == 0) &&
!(*delay_on == MLXCPLD_LED_BLINK_3HZ &&
*delay_off == MLXCPLD_LED_BLINK_3HZ) &&
!(*delay_on == MLXCPLD_LED_BLINK_6HZ &&
*delay_off == MLXCPLD_LED_BLINK_6HZ))
return -EINVAL;
if (*delay_on == MLXCPLD_LED_BLINK_6HZ)
mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
pled->param.base_color +
MLXCPLD_LED_OFFSET_FULL);
else
mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
pled->param.base_color +
MLXCPLD_LED_OFFSET_HALF);
return 0;
}
static int mlxcpld_led_config(struct device *dev,
struct mlxcpld_led_pdata *cpld)
{
int i;
int err;
cpld->pled = devm_kcalloc(dev,
cpld->num_led_instances,
sizeof(struct mlxcpld_led_priv),
GFP_KERNEL);
if (!cpld->pled)
return -ENOMEM;
for (i = 0; i < cpld->num_led_instances; i++) {
cpld->pled[i].cdev.name = cpld->profile[i].name;
cpld->pled[i].cdev.brightness = cpld->profile[i].brightness;
cpld->pled[i].cdev.max_brightness = 1;
cpld->pled[i].cdev.brightness_set = mlxcpld_led_brightness_set;
cpld->pled[i].cdev.blink_set = mlxcpld_led_blink_set;
cpld->pled[i].cdev.flags = LED_CORE_SUSPENDRESUME;
err = devm_led_classdev_register(dev, &cpld->pled[i].cdev);
if (err)
return err;
cpld->pled[i].param.offset = mlxcpld_led->profile[i].offset;
cpld->pled[i].param.mask = mlxcpld_led->profile[i].mask;
cpld->pled[i].param.base_color =
mlxcpld_led->profile[i].base_color;
if (mlxcpld_led->profile[i].brightness)
mlxcpld_led_brightness_set(&cpld->pled[i].cdev,
mlxcpld_led->profile[i].brightness);
}
return 0;
}
static int __init mlxcpld_led_probe(struct platform_device *pdev)
{
enum mlxcpld_led_platform_types mlxcpld_led_plat =
mlxcpld_led_platform_check_sys_type();
mlxcpld_led = devm_kzalloc(&pdev->dev, sizeof(*mlxcpld_led),
GFP_KERNEL);
if (!mlxcpld_led)
return -ENOMEM;
mlxcpld_led->pdev = pdev;
switch (mlxcpld_led_plat) {
case MLXCPLD_LED_PLATFORM_MSN2100:
mlxcpld_led->profile = mlxcpld_led_msn2100_profile;
mlxcpld_led->num_led_instances =
ARRAY_SIZE(mlxcpld_led_msn2100_profile);
break;
default:
mlxcpld_led->profile = mlxcpld_led_default_profile;
mlxcpld_led->num_led_instances =
ARRAY_SIZE(mlxcpld_led_default_profile);
break;
}
spin_lock_init(&mlxcpld_led->lock);
return mlxcpld_led_config(&pdev->dev, mlxcpld_led);
}
static struct platform_driver mlxcpld_led_driver = {
.driver = {
.name = KBUILD_MODNAME,
},
};
static int __init mlxcpld_led_init(void)
{
struct platform_device *pdev;
int err;
if (!dmi_match(DMI_CHASSIS_VENDOR, "Mellanox Technologies Ltd."))
return -ENODEV;
pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
if (IS_ERR(pdev)) {
pr_err("Device allocation failed\n");
return PTR_ERR(pdev);
}
err = platform_driver_probe(&mlxcpld_led_driver, mlxcpld_led_probe);
if (err) {
pr_err("Probe platform driver failed\n");
platform_device_unregister(pdev);
}
return err;
}
static void __exit mlxcpld_led_exit(void)
{
platform_device_unregister(mlxcpld_led->pdev);
platform_driver_unregister(&mlxcpld_led_driver);
}
module_init(mlxcpld_led_init);
module_exit(mlxcpld_led_exit);
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox board LED driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:leds_mlxcpld");
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