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1/*2 * drivers/leds/leds-mlxcpld.c3 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.4 * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>5 *6 * Redistribution and use in source and binary forms, with or without7 * modification, are permitted provided that the following conditions are met:8 *9 * 1. Redistributions of source code must retain the above copyright10 * notice, this list of conditions and the following disclaimer.11 * 2. Redistributions in binary form must reproduce the above copyright12 * notice, this list of conditions and the following disclaimer in the13 * documentation and/or other materials provided with the distribution.14 * 3. Neither the names of the copyright holders nor the names of its15 * contributors may be used to endorse or promote products derived from16 * this software without specific prior written permission.17 *18 * Alternatively, this software may be distributed under the terms of the19 * GNU General Public License ("GPL") version 2 as published by the Free20 * Software Foundation.21 *22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE32 * POSSIBILITY OF SUCH DAMAGE.33 */34 35#include <linux/acpi.h>36#include <linux/device.h>37#include <linux/dmi.h>38#include <linux/hwmon.h>39#include <linux/hwmon-sysfs.h>40#include <linux/io.h>41#include <linux/leds.h>42#include <linux/module.h>43#include <linux/mod_devicetable.h>44#include <linux/platform_device.h>45#include <linux/slab.h>46 47#define MLXPLAT_CPLD_LPC_REG_BASE_ADRR 0x2500 /* LPC bus access */48 49/* Color codes for LEDs */50#define MLXCPLD_LED_OFFSET_HALF 0x01 /* Offset from solid: 3Hz blink */51#define MLXCPLD_LED_OFFSET_FULL 0x02 /* Offset from solid: 6Hz blink */52#define MLXCPLD_LED_IS_OFF 0x00 /* Off */53#define MLXCPLD_LED_RED_STATIC_ON 0x05 /* Solid red */54#define MLXCPLD_LED_RED_BLINK_HALF (MLXCPLD_LED_RED_STATIC_ON + \55 MLXCPLD_LED_OFFSET_HALF)56#define MLXCPLD_LED_RED_BLINK_FULL (MLXCPLD_LED_RED_STATIC_ON + \57 MLXCPLD_LED_OFFSET_FULL)58#define MLXCPLD_LED_GREEN_STATIC_ON 0x0D /* Solid green */59#define MLXCPLD_LED_GREEN_BLINK_HALF (MLXCPLD_LED_GREEN_STATIC_ON + \60 MLXCPLD_LED_OFFSET_HALF)61#define MLXCPLD_LED_GREEN_BLINK_FULL (MLXCPLD_LED_GREEN_STATIC_ON + \62 MLXCPLD_LED_OFFSET_FULL)63#define MLXCPLD_LED_BLINK_3HZ 167 /* ~167 msec off/on */64#define MLXCPLD_LED_BLINK_6HZ 83 /* ~83 msec off/on */65 66/**67 * struct mlxcpld_param - LED access parameters:68 * @offset: offset for LED access in CPLD device69 * @mask: mask for LED access in CPLD device70 * @base_color: base color code for LED71**/72struct mlxcpld_param {73 u8 offset;74 u8 mask;75 u8 base_color;76};77 78/**79 * struct mlxcpld_led_priv - LED private data:80 * @cdev: LED class device instance81 * @param: LED CPLD access parameters82**/83struct mlxcpld_led_priv {84 struct led_classdev cdev;85 struct mlxcpld_param param;86};87 88#define cdev_to_priv(c) container_of(c, struct mlxcpld_led_priv, cdev)89 90/**91 * struct mlxcpld_led_profile - system LED profile (defined per system class):92 * @offset: offset for LED access in CPLD device93 * @mask: mask for LED access in CPLD device94 * @base_color: base color code95 * @brightness: default brightness setting (on/off)96 * @name: LED name97**/98struct mlxcpld_led_profile {99 u8 offset;100 u8 mask;101 u8 base_color;102 enum led_brightness brightness;103 const char *name;104};105 106/**107 * struct mlxcpld_led_pdata - system LED private data108 * @pdev: platform device pointer109 * @pled: LED class device instance110 * @profile: system configuration profile111 * @num_led_instances: number of LED instances112 * @lock: device access lock113**/114struct mlxcpld_led_pdata {115 struct platform_device *pdev;116 struct mlxcpld_led_priv *pled;117 struct mlxcpld_led_profile *profile;118 int num_led_instances;119 spinlock_t lock;120};121 122static struct mlxcpld_led_pdata *mlxcpld_led;123 124/* Default profile fit the next Mellanox systems:125 * "msx6710", "msx6720", "msb7700", "msn2700", "msx1410",126 * "msn2410", "msb7800", "msn2740"127 */128static struct mlxcpld_led_profile mlxcpld_led_default_profile[] = {129 {130 0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,131 "mlxcpld:fan1:green",132 },133 {134 0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,135 "mlxcpld:fan1:red",136 },137 {138 0x21, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,139 "mlxcpld:fan2:green",140 },141 {142 0x21, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,143 "mlxcpld:fan2:red",144 },145 {146 0x22, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,147 "mlxcpld:fan3:green",148 },149 {150 0x22, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,151 "mlxcpld:fan3:red",152 },153 {154 0x22, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,155 "mlxcpld:fan4:green",156 },157 {158 0x22, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,159 "mlxcpld:fan4:red",160 },161 {162 0x20, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,163 "mlxcpld:psu:green",164 },165 {166 0x20, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,167 "mlxcpld:psu:red",168 },169 {170 0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,171 "mlxcpld:status:green",172 },173 {174 0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,175 "mlxcpld:status:red",176 },177};178 179/* Profile fit the Mellanox systems based on "msn2100" */180static struct mlxcpld_led_profile mlxcpld_led_msn2100_profile[] = {181 {182 0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,183 "mlxcpld:fan:green",184 },185 {186 0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,187 "mlxcpld:fan:red",188 },189 {190 0x23, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,191 "mlxcpld:psu1:green",192 },193 {194 0x23, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,195 "mlxcpld:psu1:red",196 },197 {198 0x23, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,199 "mlxcpld:psu2:green",200 },201 {202 0x23, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,203 "mlxcpld:psu2:red",204 },205 {206 0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,207 "mlxcpld:status:green",208 },209 {210 0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,211 "mlxcpld:status:red",212 },213 {214 0x24, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, LED_OFF,215 "mlxcpld:uid:blue",216 },217};218 219enum mlxcpld_led_platform_types {220 MLXCPLD_LED_PLATFORM_DEFAULT,221 MLXCPLD_LED_PLATFORM_MSN2100,222};223 224static const char *mlx_product_names[] = {225 "DEFAULT",226 "MSN2100",227};228 229static enum230mlxcpld_led_platform_types mlxcpld_led_platform_check_sys_type(void)231{232 const char *mlx_product_name;233 int i;234 235 mlx_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);236 if (!mlx_product_name)237 return MLXCPLD_LED_PLATFORM_DEFAULT;238 239 for (i = 1; i < ARRAY_SIZE(mlx_product_names); i++) {240 if (strstr(mlx_product_name, mlx_product_names[i]))241 return i;242 }243 244 return MLXCPLD_LED_PLATFORM_DEFAULT;245}246 247static void mlxcpld_led_bus_access_func(u16 base, u8 offset, u8 rw_flag,248 u8 *data)249{250 u32 addr = base + offset;251 252 if (rw_flag == 0)253 outb(*data, addr);254 else255 *data = inb(addr);256}257 258static void mlxcpld_led_store_hw(u8 mask, u8 off, u8 vset)259{260 u8 nib, val;261 262 /*263 * Each LED is controlled through low or high nibble of the relevant264 * CPLD register. Register offset is specified by off parameter.265 * Parameter vset provides color code: 0x0 for off, 0x5 for solid red,266 * 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink267 * green.268 * Parameter mask specifies which nibble is used for specific LED: mask269 * 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -270 * higher nibble (bits from 4 to 7).271 */272 spin_lock(&mlxcpld_led->lock);273 mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 1,274 &val);275 nib = (mask == 0xf0) ? vset : (vset << 4);276 val = (val & mask) | nib;277 mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 0,278 &val);279 spin_unlock(&mlxcpld_led->lock);280}281 282static void mlxcpld_led_brightness_set(struct led_classdev *led,283 enum led_brightness value)284{285 struct mlxcpld_led_priv *pled = cdev_to_priv(led);286 287 if (value) {288 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,289 pled->param.base_color);290 return;291 }292 293 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,294 MLXCPLD_LED_IS_OFF);295}296 297static int mlxcpld_led_blink_set(struct led_classdev *led,298 unsigned long *delay_on,299 unsigned long *delay_off)300{301 struct mlxcpld_led_priv *pled = cdev_to_priv(led);302 303 /*304 * HW supports two types of blinking: full (6Hz) and half (3Hz).305 * For delay on/off zero default setting 3Hz is used.306 */307 if (!(*delay_on == 0 && *delay_off == 0) &&308 !(*delay_on == MLXCPLD_LED_BLINK_3HZ &&309 *delay_off == MLXCPLD_LED_BLINK_3HZ) &&310 !(*delay_on == MLXCPLD_LED_BLINK_6HZ &&311 *delay_off == MLXCPLD_LED_BLINK_6HZ))312 return -EINVAL;313 314 if (*delay_on == MLXCPLD_LED_BLINK_6HZ)315 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,316 pled->param.base_color +317 MLXCPLD_LED_OFFSET_FULL);318 else319 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,320 pled->param.base_color +321 MLXCPLD_LED_OFFSET_HALF);322 323 return 0;324}325 326static int mlxcpld_led_config(struct device *dev,327 struct mlxcpld_led_pdata *cpld)328{329 int i;330 int err;331 332 cpld->pled = devm_kcalloc(dev,333 cpld->num_led_instances,334 sizeof(struct mlxcpld_led_priv),335 GFP_KERNEL);336 if (!cpld->pled)337 return -ENOMEM;338 339 for (i = 0; i < cpld->num_led_instances; i++) {340 cpld->pled[i].cdev.name = cpld->profile[i].name;341 cpld->pled[i].cdev.brightness = cpld->profile[i].brightness;342 cpld->pled[i].cdev.max_brightness = 1;343 cpld->pled[i].cdev.brightness_set = mlxcpld_led_brightness_set;344 cpld->pled[i].cdev.blink_set = mlxcpld_led_blink_set;345 cpld->pled[i].cdev.flags = LED_CORE_SUSPENDRESUME;346 err = devm_led_classdev_register(dev, &cpld->pled[i].cdev);347 if (err)348 return err;349 350 cpld->pled[i].param.offset = mlxcpld_led->profile[i].offset;351 cpld->pled[i].param.mask = mlxcpld_led->profile[i].mask;352 cpld->pled[i].param.base_color =353 mlxcpld_led->profile[i].base_color;354 355 if (mlxcpld_led->profile[i].brightness)356 mlxcpld_led_brightness_set(&cpld->pled[i].cdev,357 mlxcpld_led->profile[i].brightness);358 }359 360 return 0;361}362 363static int __init mlxcpld_led_probe(struct platform_device *pdev)364{365 enum mlxcpld_led_platform_types mlxcpld_led_plat =366 mlxcpld_led_platform_check_sys_type();367 368 mlxcpld_led = devm_kzalloc(&pdev->dev, sizeof(*mlxcpld_led),369 GFP_KERNEL);370 if (!mlxcpld_led)371 return -ENOMEM;372 373 mlxcpld_led->pdev = pdev;374 375 switch (mlxcpld_led_plat) {376 case MLXCPLD_LED_PLATFORM_MSN2100:377 mlxcpld_led->profile = mlxcpld_led_msn2100_profile;378 mlxcpld_led->num_led_instances =379 ARRAY_SIZE(mlxcpld_led_msn2100_profile);380 break;381 382 default:383 mlxcpld_led->profile = mlxcpld_led_default_profile;384 mlxcpld_led->num_led_instances =385 ARRAY_SIZE(mlxcpld_led_default_profile);386 break;387 }388 389 spin_lock_init(&mlxcpld_led->lock);390 391 return mlxcpld_led_config(&pdev->dev, mlxcpld_led);392}393 394static struct platform_driver mlxcpld_led_driver = {395 .driver = {396 .name = KBUILD_MODNAME,397 },398};399 400static int __init mlxcpld_led_init(void)401{402 struct platform_device *pdev;403 int err;404 405 if (!dmi_match(DMI_CHASSIS_VENDOR, "Mellanox Technologies Ltd."))406 return -ENODEV;407 408 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);409 if (IS_ERR(pdev)) {410 pr_err("Device allocation failed\n");411 return PTR_ERR(pdev);412 }413 414 err = platform_driver_probe(&mlxcpld_led_driver, mlxcpld_led_probe);415 if (err) {416 pr_err("Probe platform driver failed\n");417 platform_device_unregister(pdev);418 }419 420 return err;421}422 423static void __exit mlxcpld_led_exit(void)424{425 platform_device_unregister(mlxcpld_led->pdev);426 platform_driver_unregister(&mlxcpld_led_driver);427}428 429module_init(mlxcpld_led_init);430module_exit(mlxcpld_led_exit);431 432MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");433MODULE_DESCRIPTION("Mellanox board LED driver");434MODULE_LICENSE("Dual BSD/GPL");435MODULE_ALIAS("platform:leds_mlxcpld");436