296 lines
8.7 KiB
C
296 lines
8.7 KiB
C
// 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 <vadimp@mellanox.com>
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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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int err;
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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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err = devm_mutex_init(&pdev->dev, &priv->access_lock);
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if (err)
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return err;
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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 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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};
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module_platform_driver(mlxreg_led_driver);
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MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
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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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