// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) // // Copyright (c) 2018 Mellanox Technologies. All rights reserved. // Copyright (c) 2018 Vadim Pasternak #include #include #include #include #include #include #include #include /* Codes for LEDs. */ #define MLXREG_LED_OFFSET_BLINK_3HZ 0x01 /* Offset from solid: 3Hz blink */ #define MLXREG_LED_OFFSET_BLINK_6HZ 0x02 /* Offset from solid: 6Hz blink */ #define MLXREG_LED_IS_OFF 0x00 /* Off */ #define MLXREG_LED_RED_SOLID 0x05 /* Solid red */ #define MLXREG_LED_GREEN_SOLID 0x0D /* Solid green */ #define MLXREG_LED_AMBER_SOLID 0x09 /* Solid amber */ #define MLXREG_LED_BLINK_3HZ 167 /* ~167 msec off/on - HW support */ #define MLXREG_LED_BLINK_6HZ 83 /* ~83 msec off/on - HW support */ #define MLXREG_LED_CAPABILITY_CLEAR GENMASK(31, 8) /* Clear mask */ /** * struct mlxreg_led_data - led control data: * * @data: led configuration data; * @led_cdev: led class data; * @base_color: base led color (other colors have constant offset from base); * @led_data: led data; * @data_parent: pointer to private device control data of parent; * @led_cdev_name: class device name */ struct mlxreg_led_data { struct mlxreg_core_data *data; struct led_classdev led_cdev; u8 base_color; void *data_parent; char led_cdev_name[MLXREG_CORE_LABEL_MAX_SIZE]; }; #define cdev_to_priv(c) container_of(c, struct mlxreg_led_data, led_cdev) /** * struct mlxreg_led_priv_data - platform private data: * * @pdev: platform device; * @pdata: platform data; * @access_lock: mutex for attribute IO access; */ struct mlxreg_led_priv_data { struct platform_device *pdev; struct mlxreg_core_platform_data *pdata; struct mutex access_lock; /* protect IO operations */ }; static int mlxreg_led_store_hw(struct mlxreg_led_data *led_data, u8 vset) { struct mlxreg_led_priv_data *priv = led_data->data_parent; struct mlxreg_core_platform_data *led_pdata = priv->pdata; struct mlxreg_core_data *data = led_data->data; u32 regval; u32 nib; int ret; /* * Each LED is controlled through low or high nibble of the relevant * register byte. 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). */ mutex_lock(&priv->access_lock); ret = regmap_read(led_pdata->regmap, data->reg, ®val); if (ret) goto access_error; nib = (ror32(data->mask, data->bit) == 0xf0) ? rol32(vset, data->bit) : rol32(vset, data->bit + 4); regval = (regval & data->mask) | nib; ret = regmap_write(led_pdata->regmap, data->reg, regval); access_error: mutex_unlock(&priv->access_lock); return ret; } static enum led_brightness mlxreg_led_get_hw(struct mlxreg_led_data *led_data) { struct mlxreg_led_priv_data *priv = led_data->data_parent; struct mlxreg_core_platform_data *led_pdata = priv->pdata; struct mlxreg_core_data *data = led_data->data; u32 regval; int err; /* * Each LED is controlled through low or high nibble of the relevant * register byte. 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). */ err = regmap_read(led_pdata->regmap, data->reg, ®val); if (err < 0) { dev_warn(led_data->led_cdev.dev, "Failed to get current brightness, error: %d\n", err); /* Assume the LED is OFF */ return LED_OFF; } regval = regval & ~data->mask; regval = (ror32(data->mask, data->bit) == 0xf0) ? ror32(regval, data->bit) : ror32(regval, data->bit + 4); if (regval >= led_data->base_color && regval <= (led_data->base_color + MLXREG_LED_OFFSET_BLINK_6HZ)) return LED_FULL; return LED_OFF; } static int mlxreg_led_brightness_set(struct led_classdev *cled, enum led_brightness value) { struct mlxreg_led_data *led_data = cdev_to_priv(cled); if (value) return mlxreg_led_store_hw(led_data, led_data->base_color); else return mlxreg_led_store_hw(led_data, MLXREG_LED_IS_OFF); } static enum led_brightness mlxreg_led_brightness_get(struct led_classdev *cled) { struct mlxreg_led_data *led_data = cdev_to_priv(cled); return mlxreg_led_get_hw(led_data); } static int mlxreg_led_blink_set(struct led_classdev *cled, unsigned long *delay_on, unsigned long *delay_off) { struct mlxreg_led_data *led_data = cdev_to_priv(cled); int err; /* * HW supports two types of blinking: full (6Hz) and half (3Hz). * For delay on/off zero LED is setting to solid color. For others * combination blinking is to be controlled by the software timer. */ if (!(*delay_on == 0 && *delay_off == 0) && !(*delay_on == MLXREG_LED_BLINK_3HZ && *delay_off == MLXREG_LED_BLINK_3HZ) && !(*delay_on == MLXREG_LED_BLINK_6HZ && *delay_off == MLXREG_LED_BLINK_6HZ)) return -EINVAL; if (*delay_on == MLXREG_LED_BLINK_6HZ) err = mlxreg_led_store_hw(led_data, led_data->base_color + MLXREG_LED_OFFSET_BLINK_6HZ); else if (*delay_on == MLXREG_LED_BLINK_3HZ) err = mlxreg_led_store_hw(led_data, led_data->base_color + MLXREG_LED_OFFSET_BLINK_3HZ); else err = mlxreg_led_store_hw(led_data, led_data->base_color); return err; } static int mlxreg_led_config(struct mlxreg_led_priv_data *priv) { struct mlxreg_core_platform_data *led_pdata = priv->pdata; struct mlxreg_core_data *data = led_pdata->data; struct mlxreg_led_data *led_data; struct led_classdev *led_cdev; enum led_brightness brightness; u32 regval; int i; int err; for (i = 0; i < led_pdata->counter; i++, data++) { led_data = devm_kzalloc(&priv->pdev->dev, sizeof(*led_data), GFP_KERNEL); if (!led_data) return -ENOMEM; if (data->capability) { err = regmap_read(led_pdata->regmap, data->capability, ®val); if (err) { dev_err(&priv->pdev->dev, "Failed to query capability register\n"); return err; } if (!(regval & data->bit)) continue; /* * Field "bit" can contain one capability bit in 0 byte * and offset bit in 1-3 bytes. Clear capability bit and * keep only offset bit. */ data->bit &= MLXREG_LED_CAPABILITY_CLEAR; } led_cdev = &led_data->led_cdev; led_data->data_parent = priv; if (strstr(data->label, "red") || strstr(data->label, "orange")) { brightness = LED_OFF; led_data->base_color = MLXREG_LED_RED_SOLID; } else if (strstr(data->label, "amber")) { brightness = LED_OFF; led_data->base_color = MLXREG_LED_AMBER_SOLID; } else { brightness = LED_OFF; led_data->base_color = MLXREG_LED_GREEN_SOLID; } snprintf(led_data->led_cdev_name, sizeof(led_data->led_cdev_name), "mlxreg:%s", data->label); led_cdev->name = led_data->led_cdev_name; led_cdev->brightness = brightness; led_cdev->max_brightness = LED_ON; led_cdev->brightness_set_blocking = mlxreg_led_brightness_set; led_cdev->brightness_get = mlxreg_led_brightness_get; led_cdev->blink_set = mlxreg_led_blink_set; led_cdev->flags = LED_CORE_SUSPENDRESUME; led_data->data = data; err = devm_led_classdev_register(&priv->pdev->dev, led_cdev); if (err) return err; if (led_cdev->brightness) mlxreg_led_brightness_set(led_cdev, led_cdev->brightness); dev_info(led_cdev->dev, "label: %s, mask: 0x%02x, offset:0x%02x\n", data->label, data->mask, data->reg); } return 0; } static int mlxreg_led_probe(struct platform_device *pdev) { struct mlxreg_core_platform_data *led_pdata; struct mlxreg_led_priv_data *priv; int err; led_pdata = dev_get_platdata(&pdev->dev); if (!led_pdata) { dev_err(&pdev->dev, "Failed to get platform data.\n"); return -EINVAL; } priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; err = devm_mutex_init(&pdev->dev, &priv->access_lock); if (err) return err; priv->pdev = pdev; priv->pdata = led_pdata; return mlxreg_led_config(priv); } static struct platform_driver mlxreg_led_driver = { .driver = { .name = "leds-mlxreg", }, .probe = mlxreg_led_probe, }; module_platform_driver(mlxreg_led_driver); MODULE_AUTHOR("Vadim Pasternak "); MODULE_DESCRIPTION("Mellanox LED regmap driver"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_ALIAS("platform:leds-mlxreg");