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301 lines
8.8 KiB
301 lines
8.8 KiB
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
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// |
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// Copyright (c) 2018 Mellanox Technologies. All rights reserved. |
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// Copyright (c) 2018 Vadim Pasternak <[email protected]> |
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#include <linux/bitops.h> |
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#include <linux/device.h> |
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#include <linux/io.h> |
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#include <linux/leds.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_data/mlxreg.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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/* Codes for LEDs. */ |
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#define MLXREG_LED_OFFSET_BLINK_3HZ 0x01 /* Offset from solid: 3Hz blink */ |
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#define MLXREG_LED_OFFSET_BLINK_6HZ 0x02 /* Offset from solid: 6Hz blink */ |
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#define MLXREG_LED_IS_OFF 0x00 /* Off */ |
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#define MLXREG_LED_RED_SOLID 0x05 /* Solid red */ |
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#define MLXREG_LED_GREEN_SOLID 0x0D /* Solid green */ |
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#define MLXREG_LED_AMBER_SOLID 0x09 /* Solid amber */ |
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#define MLXREG_LED_BLINK_3HZ 167 /* ~167 msec off/on - HW support */ |
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#define MLXREG_LED_BLINK_6HZ 83 /* ~83 msec off/on - HW support */ |
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#define MLXREG_LED_CAPABILITY_CLEAR GENMASK(31, 8) /* Clear mask */ |
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/** |
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* struct mlxreg_led_data - led control data: |
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* |
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* @data: led configuration data; |
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* @led_cdev: led class data; |
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* @base_color: base led color (other colors have constant offset from base); |
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* @led_data: led data; |
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* @data_parent: pointer to private device control data of parent; |
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* @led_cdev_name: class device name |
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*/ |
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struct mlxreg_led_data { |
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struct mlxreg_core_data *data; |
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struct led_classdev led_cdev; |
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u8 base_color; |
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void *data_parent; |
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char led_cdev_name[MLXREG_CORE_LABEL_MAX_SIZE]; |
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}; |
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#define cdev_to_priv(c) container_of(c, struct mlxreg_led_data, led_cdev) |
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/** |
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* struct mlxreg_led_priv_data - platform private data: |
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* |
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* @pdev: platform device; |
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* @pdata: platform data; |
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* @access_lock: mutex for attribute IO access; |
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*/ |
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struct mlxreg_led_priv_data { |
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struct platform_device *pdev; |
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struct mlxreg_core_platform_data *pdata; |
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struct mutex access_lock; /* protect IO operations */ |
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}; |
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static int |
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mlxreg_led_store_hw(struct mlxreg_led_data *led_data, u8 vset) |
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{ |
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struct mlxreg_led_priv_data *priv = led_data->data_parent; |
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struct mlxreg_core_platform_data *led_pdata = priv->pdata; |
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struct mlxreg_core_data *data = led_data->data; |
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u32 regval; |
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u32 nib; |
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int ret; |
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/* |
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* Each LED is controlled through low or high nibble of the relevant |
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* register byte. Register offset is specified by off parameter. |
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* Parameter vset provides color code: 0x0 for off, 0x5 for solid red, |
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* 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink |
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* green. |
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* Parameter mask specifies which nibble is used for specific LED: mask |
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* 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f - |
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* higher nibble (bits from 4 to 7). |
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*/ |
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mutex_lock(&priv->access_lock); |
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ret = regmap_read(led_pdata->regmap, data->reg, ®val); |
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if (ret) |
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goto access_error; |
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nib = (ror32(data->mask, data->bit) == 0xf0) ? rol32(vset, data->bit) : |
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rol32(vset, data->bit + 4); |
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regval = (regval & data->mask) | nib; |
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ret = regmap_write(led_pdata->regmap, data->reg, regval); |
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access_error: |
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mutex_unlock(&priv->access_lock); |
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return ret; |
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} |
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static enum led_brightness |
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mlxreg_led_get_hw(struct mlxreg_led_data *led_data) |
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{ |
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struct mlxreg_led_priv_data *priv = led_data->data_parent; |
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struct mlxreg_core_platform_data *led_pdata = priv->pdata; |
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struct mlxreg_core_data *data = led_data->data; |
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u32 regval; |
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int err; |
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/* |
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* Each LED is controlled through low or high nibble of the relevant |
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* register byte. Register offset is specified by off parameter. |
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* Parameter vset provides color code: 0x0 for off, 0x5 for solid red, |
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* 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink |
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* green. |
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* Parameter mask specifies which nibble is used for specific LED: mask |
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* 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f - |
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* higher nibble (bits from 4 to 7). |
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*/ |
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err = regmap_read(led_pdata->regmap, data->reg, ®val); |
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if (err < 0) { |
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dev_warn(led_data->led_cdev.dev, "Failed to get current brightness, error: %d\n", |
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err); |
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/* Assume the LED is OFF */ |
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return LED_OFF; |
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} |
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regval = regval & ~data->mask; |
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regval = (ror32(data->mask, data->bit) == 0xf0) ? ror32(regval, |
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data->bit) : ror32(regval, data->bit + 4); |
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if (regval >= led_data->base_color && |
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regval <= (led_data->base_color + MLXREG_LED_OFFSET_BLINK_6HZ)) |
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return LED_FULL; |
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return LED_OFF; |
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} |
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static int |
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mlxreg_led_brightness_set(struct led_classdev *cled, enum led_brightness value) |
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{ |
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struct mlxreg_led_data *led_data = cdev_to_priv(cled); |
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if (value) |
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return mlxreg_led_store_hw(led_data, led_data->base_color); |
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else |
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return mlxreg_led_store_hw(led_data, MLXREG_LED_IS_OFF); |
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} |
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static enum led_brightness |
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mlxreg_led_brightness_get(struct led_classdev *cled) |
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{ |
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struct mlxreg_led_data *led_data = cdev_to_priv(cled); |
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return mlxreg_led_get_hw(led_data); |
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} |
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static int |
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mlxreg_led_blink_set(struct led_classdev *cled, unsigned long *delay_on, |
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unsigned long *delay_off) |
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{ |
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struct mlxreg_led_data *led_data = cdev_to_priv(cled); |
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int err; |
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/* |
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* HW supports two types of blinking: full (6Hz) and half (3Hz). |
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* For delay on/off zero LED is setting to solid color. For others |
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* combination blinking is to be controlled by the software timer. |
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*/ |
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if (!(*delay_on == 0 && *delay_off == 0) && |
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!(*delay_on == MLXREG_LED_BLINK_3HZ && |
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*delay_off == MLXREG_LED_BLINK_3HZ) && |
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!(*delay_on == MLXREG_LED_BLINK_6HZ && |
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*delay_off == MLXREG_LED_BLINK_6HZ)) |
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return -EINVAL; |
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if (*delay_on == MLXREG_LED_BLINK_6HZ) |
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err = mlxreg_led_store_hw(led_data, led_data->base_color + |
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MLXREG_LED_OFFSET_BLINK_6HZ); |
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else if (*delay_on == MLXREG_LED_BLINK_3HZ) |
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err = mlxreg_led_store_hw(led_data, led_data->base_color + |
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MLXREG_LED_OFFSET_BLINK_3HZ); |
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else |
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err = mlxreg_led_store_hw(led_data, led_data->base_color); |
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return err; |
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} |
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static int mlxreg_led_config(struct mlxreg_led_priv_data *priv) |
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{ |
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struct mlxreg_core_platform_data *led_pdata = priv->pdata; |
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struct mlxreg_core_data *data = led_pdata->data; |
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struct mlxreg_led_data *led_data; |
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struct led_classdev *led_cdev; |
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enum led_brightness brightness; |
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u32 regval; |
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int i; |
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int err; |
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for (i = 0; i < led_pdata->counter; i++, data++) { |
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led_data = devm_kzalloc(&priv->pdev->dev, sizeof(*led_data), |
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GFP_KERNEL); |
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if (!led_data) |
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return -ENOMEM; |
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if (data->capability) { |
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err = regmap_read(led_pdata->regmap, data->capability, |
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®val); |
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if (err) { |
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dev_err(&priv->pdev->dev, "Failed to query capability register\n"); |
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return err; |
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} |
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if (!(regval & data->bit)) |
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continue; |
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/* |
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* Field "bit" can contain one capability bit in 0 byte |
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* and offset bit in 1-3 bytes. Clear capability bit and |
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* keep only offset bit. |
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*/ |
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data->bit &= MLXREG_LED_CAPABILITY_CLEAR; |
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} |
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led_cdev = &led_data->led_cdev; |
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led_data->data_parent = priv; |
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if (strstr(data->label, "red") || |
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strstr(data->label, "orange")) { |
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brightness = LED_OFF; |
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led_data->base_color = MLXREG_LED_RED_SOLID; |
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} else if (strstr(data->label, "amber")) { |
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brightness = LED_OFF; |
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led_data->base_color = MLXREG_LED_AMBER_SOLID; |
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} else { |
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brightness = LED_OFF; |
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led_data->base_color = MLXREG_LED_GREEN_SOLID; |
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} |
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snprintf(led_data->led_cdev_name, sizeof(led_data->led_cdev_name), |
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"mlxreg:%s", data->label); |
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led_cdev->name = led_data->led_cdev_name; |
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led_cdev->brightness = brightness; |
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led_cdev->max_brightness = LED_ON; |
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led_cdev->brightness_set_blocking = |
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mlxreg_led_brightness_set; |
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led_cdev->brightness_get = mlxreg_led_brightness_get; |
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led_cdev->blink_set = mlxreg_led_blink_set; |
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led_cdev->flags = LED_CORE_SUSPENDRESUME; |
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led_data->data = data; |
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err = devm_led_classdev_register(&priv->pdev->dev, led_cdev); |
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if (err) |
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return err; |
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if (led_cdev->brightness) |
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mlxreg_led_brightness_set(led_cdev, |
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led_cdev->brightness); |
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dev_info(led_cdev->dev, "label: %s, mask: 0x%02x, offset:0x%02x\n", |
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data->label, data->mask, data->reg); |
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} |
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return 0; |
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} |
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static int mlxreg_led_probe(struct platform_device *pdev) |
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{ |
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struct mlxreg_core_platform_data *led_pdata; |
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struct mlxreg_led_priv_data *priv; |
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led_pdata = dev_get_platdata(&pdev->dev); |
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if (!led_pdata) { |
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dev_err(&pdev->dev, "Failed to get platform data.\n"); |
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return -EINVAL; |
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} |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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mutex_init(&priv->access_lock); |
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priv->pdev = pdev; |
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priv->pdata = led_pdata; |
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return mlxreg_led_config(priv); |
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} |
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static int mlxreg_led_remove(struct platform_device *pdev) |
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{ |
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struct mlxreg_led_priv_data *priv = dev_get_drvdata(&pdev->dev); |
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mutex_destroy(&priv->access_lock); |
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return 0; |
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} |
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static struct platform_driver mlxreg_led_driver = { |
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.driver = { |
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.name = "leds-mlxreg", |
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}, |
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.probe = mlxreg_led_probe, |
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.remove = mlxreg_led_remove, |
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}; |
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module_platform_driver(mlxreg_led_driver); |
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MODULE_AUTHOR("Vadim Pasternak <[email protected]>"); |
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MODULE_DESCRIPTION("Mellanox LED regmap driver"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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MODULE_ALIAS("platform:leds-mlxreg");
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