461 lines
12 KiB
C
461 lines
12 KiB
C
/*
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* A LED driver for the as7816_64x_led
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*
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* Copyright (C) 2014 Accton Technology Corporation.
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* Brandon Chuang <brandon_chuang@accton.com.tw>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*#define DEBUG*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/dmi.h>
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extern int accton_i2c_cpld_read (u8 cpld_addr, u8 reg);
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extern int accton_i2c_cpld_write(unsigned short cpld_addr, u8 reg, u8 value);
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extern void led_classdev_unregister(struct led_classdev *led_cdev);
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extern int led_classdev_register(struct device *parent, struct led_classdev *led_cdev);
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extern void led_classdev_resume(struct led_classdev *led_cdev);
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extern void led_classdev_suspend(struct led_classdev *led_cdev);
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#define DRVNAME "as7816_64x_led"
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struct as7816_64x_led_data {
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struct platform_device *pdev;
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struct mutex update_lock;
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char valid; /* != 0 if registers are valid */
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unsigned long last_updated; /* In jiffies */
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u8 reg_val[1]; /* only 1 register*/
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};
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static struct as7816_64x_led_data *ledctl = NULL;
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/* LED related data
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*/
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#define LED_CNTRLER_I2C_ADDRESS (0x60)
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#define LED_TYPE_DIAG_REG_MASK (0x03)
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#define LED_MODE_DIAG_YELLOW_VALUE (0x00)
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#define LED_MODE_DIAG_RED_VALUE (0x01)
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#define LED_MODE_DIAG_GREEN_VALUE (0x02)
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#define LED_MODE_DIAG_OFF_VALUE (0x03)
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#define LED_TYPE_LOC_REG_MASK (0x10)
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#define LED_MODE_LOC_ORANGE_VALUE (0x00)
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#define LED_MODE_LOC_OFF_VALUE (0x10)
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#define LED_TYPE_FAN_REG_MASK (0x0C)
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#define LED_MODE_FAN_ORANGE_VALUE (0x04)
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#define LED_MODE_FAN_GREEN_VALUE_1 (0x00)
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#define LED_MODE_FAN_GREEN_VALUE_2 (0x08)
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#define LED_MODE_FAN_OFF_VALUE (0x0C)
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enum led_type {
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LED_TYPE_DIAG,
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LED_TYPE_LOC,
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LED_TYPE_FAN,
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LED_TYPE_PSU1,
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LED_TYPE_PSU2
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};
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struct led_reg {
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u32 types;
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u8 reg_addr;
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};
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static const struct led_reg led_reg_map[] = {
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{(1 << LED_TYPE_LOC) | (1 << LED_TYPE_DIAG) | (1 << LED_TYPE_FAN), 0x30},
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};
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enum led_light_mode {
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LED_MODE_OFF,
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LED_MODE_RED = 10,
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LED_MODE_RED_BLINKING = 11,
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LED_MODE_ORANGE = 12,
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LED_MODE_ORANGE_BLINKING = 13,
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LED_MODE_YELLOW = 14,
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LED_MODE_YELLOW_BLINKING = 15,
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LED_MODE_GREEN = 16,
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LED_MODE_GREEN_BLINKING = 17,
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LED_MODE_BLUE = 18,
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LED_MODE_BLUE_BLINKING = 19,
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LED_MODE_PURPLE = 20,
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LED_MODE_PURPLE_BLINKING = 21,
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LED_MODE_AUTO = 22,
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LED_MODE_AUTO_BLINKING = 23,
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LED_MODE_WHITE = 24,
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LED_MODE_WHITE_BLINKING = 25,
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LED_MODE_CYAN = 26,
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LED_MODE_CYAN_BLINKING = 27,
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LED_MODE_UNKNOWN = 99
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};
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struct led_type_mode {
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enum led_type type;
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enum led_light_mode mode;
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int reg_bit_mask;
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int mode_value;
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};
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static struct led_type_mode led_type_mode_data[] = {
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{LED_TYPE_LOC, LED_MODE_OFF, LED_TYPE_LOC_REG_MASK, LED_MODE_LOC_OFF_VALUE},
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{LED_TYPE_LOC, LED_MODE_ORANGE,LED_TYPE_LOC_REG_MASK, LED_MODE_LOC_ORANGE_VALUE},
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{LED_TYPE_DIAG, LED_MODE_OFF, LED_TYPE_DIAG_REG_MASK, LED_MODE_DIAG_OFF_VALUE},
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{LED_TYPE_DIAG, LED_MODE_GREEN, LED_TYPE_DIAG_REG_MASK, LED_MODE_DIAG_GREEN_VALUE},
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{LED_TYPE_DIAG, LED_MODE_RED, LED_TYPE_DIAG_REG_MASK, LED_MODE_DIAG_RED_VALUE},
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{LED_TYPE_DIAG, LED_MODE_YELLOW,LED_TYPE_DIAG_REG_MASK, LED_MODE_DIAG_YELLOW_VALUE},
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{LED_TYPE_FAN, LED_MODE_OFF, LED_TYPE_FAN_REG_MASK, LED_MODE_FAN_OFF_VALUE},
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{LED_TYPE_FAN, LED_MODE_GREEN, LED_TYPE_FAN_REG_MASK, LED_MODE_FAN_GREEN_VALUE_1},
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{LED_TYPE_FAN, LED_MODE_GREEN, LED_TYPE_FAN_REG_MASK, LED_MODE_FAN_GREEN_VALUE_2},
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{LED_TYPE_FAN, LED_MODE_ORANGE,LED_TYPE_FAN_REG_MASK, LED_MODE_FAN_ORANGE_VALUE}
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};
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static int get_led_reg(enum led_type type, u8 *reg)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(led_reg_map); i++) {
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if(led_reg_map[i].types & (1 << type)) {
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*reg = led_reg_map[i].reg_addr;
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return 0;
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}
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}
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return 1;
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}
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static int led_reg_val_to_light_mode(enum led_type type, u8 reg_val)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(led_type_mode_data); i++) {
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if (type != led_type_mode_data[i].type)
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continue;
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if ((led_type_mode_data[i].reg_bit_mask & reg_val) ==
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led_type_mode_data[i].mode_value)
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{
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return led_type_mode_data[i].mode;
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}
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}
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return 0;
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}
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static u8 led_light_mode_to_reg_val(enum led_type type,
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enum led_light_mode mode, u8 reg_val) {
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int i;
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for (i = 0; i < ARRAY_SIZE(led_type_mode_data); i++) {
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if (type != led_type_mode_data[i].type)
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continue;
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if (mode != led_type_mode_data[i].mode)
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continue;
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reg_val = led_type_mode_data[i].mode_value |
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(reg_val & (~led_type_mode_data[i].reg_bit_mask));
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break;
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}
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return reg_val;
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}
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static int as7816_64x_led_read_value(u8 reg)
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{
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return accton_i2c_cpld_read(LED_CNTRLER_I2C_ADDRESS, reg);
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}
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static int as7816_64x_led_write_value(u8 reg, u8 value)
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{
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return accton_i2c_cpld_write(LED_CNTRLER_I2C_ADDRESS, reg, value);
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}
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static void as7816_64x_led_update(void)
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{
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mutex_lock(&ledctl->update_lock);
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if (time_after(jiffies, ledctl->last_updated + HZ + HZ / 2)
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|| !ledctl->valid) {
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int i;
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dev_dbg(&ledctl->pdev->dev, "Starting as7816_64x_led update\n");
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/* Update LED data
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*/
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for (i = 0; i < ARRAY_SIZE(ledctl->reg_val); i++) {
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int status = as7816_64x_led_read_value(led_reg_map[i].reg_addr);
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if (status < 0) {
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ledctl->valid = 0;
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dev_dbg(&ledctl->pdev->dev, "reg %d, err %d\n", led_reg_map[i].reg_addr, status);
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goto exit;
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}
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else
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{
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ledctl->reg_val[i] = status;
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}
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}
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ledctl->last_updated = jiffies;
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ledctl->valid = 1;
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}
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exit:
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mutex_unlock(&ledctl->update_lock);
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}
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static void as7816_64x_led_set(struct led_classdev *led_cdev,
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enum led_brightness led_light_mode,
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enum led_type type)
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{
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int reg_val;
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u8 reg ;
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mutex_lock(&ledctl->update_lock);
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if( !get_led_reg(type, ®)) {
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dev_dbg(&ledctl->pdev->dev, "Not match register for %d.\n", type);
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}
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reg_val = as7816_64x_led_read_value(reg);
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if (reg_val < 0) {
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dev_dbg(&ledctl->pdev->dev, "reg %d, err %d\n", reg, reg_val);
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goto exit;
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}
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reg_val = led_light_mode_to_reg_val(type, led_light_mode, reg_val);
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as7816_64x_led_write_value(reg, reg_val);
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/* to prevent the slow-update issue */
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ledctl->valid = 0;
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exit:
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mutex_unlock(&ledctl->update_lock);
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}
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static void as7816_64x_led_diag_set(struct led_classdev *led_cdev,
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enum led_brightness led_light_mode)
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{
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as7816_64x_led_set(led_cdev, led_light_mode, LED_TYPE_DIAG);
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}
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static enum led_brightness as7816_64x_led_diag_get(struct led_classdev *cdev)
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{
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as7816_64x_led_update();
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return led_reg_val_to_light_mode(LED_TYPE_DIAG, ledctl->reg_val[0]);
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}
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static void as7816_64x_led_loc_set(struct led_classdev *led_cdev,
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enum led_brightness led_light_mode)
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{
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as7816_64x_led_set(led_cdev, led_light_mode, LED_TYPE_LOC);
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}
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static enum led_brightness as7816_64x_led_loc_get(struct led_classdev *cdev)
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{
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as7816_64x_led_update();
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return led_reg_val_to_light_mode(LED_TYPE_LOC, ledctl->reg_val[0]);
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}
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static void as7816_64x_led_fan_set(struct led_classdev *led_cdev,
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enum led_brightness led_light_mode)
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{
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as7816_64x_led_set(led_cdev, led_light_mode, LED_TYPE_FAN);
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}
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static enum led_brightness as7816_64x_led_fan_get(struct led_classdev *cdev)
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{
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as7816_64x_led_update();
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return led_reg_val_to_light_mode(LED_TYPE_FAN, ledctl->reg_val[0]);
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}
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static void as7816_64x_led_auto_set(struct led_classdev *led_cdev,
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enum led_brightness led_light_mode)
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{
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}
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static enum led_brightness as7816_64x_led_auto_get(struct led_classdev *cdev)
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{
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return LED_MODE_AUTO;
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}
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static struct led_classdev as7816_64x_leds[] = {
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[LED_TYPE_DIAG] = {
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.name = "as7816_64x_led::diag",
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.default_trigger = "unused",
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.brightness_set = as7816_64x_led_diag_set,
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.brightness_get = as7816_64x_led_diag_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = LED_MODE_GREEN,
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},
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[LED_TYPE_LOC] = {
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.name = "as7816_64x_led::loc",
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.default_trigger = "unused",
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.brightness_set = as7816_64x_led_loc_set,
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.brightness_get = as7816_64x_led_loc_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = LED_MODE_ORANGE,
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},
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[LED_TYPE_FAN] = {
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.name = "as7816_64x_led::fan",
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.default_trigger = "unused",
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.brightness_set = as7816_64x_led_fan_set,
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.brightness_get = as7816_64x_led_fan_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = LED_MODE_GREEN,
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},
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[LED_TYPE_PSU1] = {
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.name = "as7816_64x_led::psu1",
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.default_trigger = "unused",
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.brightness_set = as7816_64x_led_auto_set,
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.brightness_get = as7816_64x_led_auto_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = LED_MODE_AUTO,
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},
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[LED_TYPE_PSU2] = {
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.name = "as7816_64x_led::psu2",
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.default_trigger = "unused",
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.brightness_set = as7816_64x_led_auto_set,
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.brightness_get = as7816_64x_led_auto_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = LED_MODE_AUTO,
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},
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};
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static int as7816_64x_led_suspend(struct platform_device *dev,
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pm_message_t state)
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{
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int i = 0;
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for (i = 0; i < ARRAY_SIZE(as7816_64x_leds); i++) {
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led_classdev_suspend(&as7816_64x_leds[i]);
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}
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return 0;
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}
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static int as7816_64x_led_resume(struct platform_device *dev)
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{
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int i = 0;
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for (i = 0; i < ARRAY_SIZE(as7816_64x_leds); i++) {
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led_classdev_resume(&as7816_64x_leds[i]);
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}
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return 0;
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}
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static int as7816_64x_led_probe(struct platform_device *pdev)
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{
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int ret, i;
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for (i = 0; i < ARRAY_SIZE(as7816_64x_leds); i++) {
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ret = led_classdev_register(&pdev->dev, &as7816_64x_leds[i]);
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if (ret < 0)
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break;
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}
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/* Check if all LEDs were successfully registered */
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if (i != ARRAY_SIZE(as7816_64x_leds)){
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int j;
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/* only unregister the LEDs that were successfully registered */
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for (j = 0; j < i; j++) {
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led_classdev_unregister(&as7816_64x_leds[i]);
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}
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}
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return ret;
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}
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static int as7816_64x_led_remove(struct platform_device *pdev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(as7816_64x_leds); i++) {
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led_classdev_unregister(&as7816_64x_leds[i]);
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}
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return 0;
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}
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static struct platform_driver as7816_64x_led_driver = {
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.probe = as7816_64x_led_probe,
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.remove = as7816_64x_led_remove,
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.suspend = as7816_64x_led_suspend,
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.resume = as7816_64x_led_resume,
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.driver = {
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.name = DRVNAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init as7816_64x_led_init(void)
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{
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int ret;
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ret = platform_driver_register(&as7816_64x_led_driver);
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if (ret < 0) {
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goto exit;
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}
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ledctl = kzalloc(sizeof(struct as7816_64x_led_data), GFP_KERNEL);
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if (!ledctl) {
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ret = -ENOMEM;
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platform_driver_unregister(&as7816_64x_led_driver);
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goto exit;
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}
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mutex_init(&ledctl->update_lock);
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ledctl->pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
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if (IS_ERR(ledctl->pdev)) {
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ret = PTR_ERR(ledctl->pdev);
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platform_driver_unregister(&as7816_64x_led_driver);
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kfree(ledctl);
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goto exit;
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}
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exit:
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return ret;
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}
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static void __exit as7816_64x_led_exit(void)
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{
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platform_device_unregister(ledctl->pdev);
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platform_driver_unregister(&as7816_64x_led_driver);
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kfree(ledctl);
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}
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module_init(as7816_64x_led_init);
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module_exit(as7816_64x_led_exit);
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MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
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MODULE_DESCRIPTION("as7816_64x_led driver");
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MODULE_LICENSE("GPL");
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