409 lines
11 KiB
C
409 lines
11 KiB
C
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/*
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* A LED driver for the accton_as7315_27xb_led
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*
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* Copyright (C) 2019 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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#define DRVNAME "as7315_27xb_led"
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#define CPLD_I2C_ADDR 0x64
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enum led_type {
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TYPE_DIAG,
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TYPE_LOC,
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TYPE_MAX
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};
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struct led_list_s {
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enum led_type type;
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char name[64];
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u8 reg_addr;
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u8 slave_addr;
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} led_list[TYPE_MAX] = {
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{TYPE_DIAG, "as7315_27xb_diag", 0x41, CPLD_I2C_ADDR},
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{TYPE_LOC, "as7315_27xb_loc", 0x40, CPLD_I2C_ADDR}
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};
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struct accton_as7315_27xb_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 slave_addr[TYPE_MAX]; /* For LOC and DIAG.*/
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u8 reg_addr[TYPE_MAX]; /* For LOC and DIAG.*/
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u8 reg_val[TYPE_MAX]; /* Register value, 0 = LOC
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1 = DIAG */
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};
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static struct accton_as7315_27xb_led_data *ledctl = NULL;
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/* LED related data
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*/
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#define TYPE_DIAG_REG_MASK 0x30
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#define MODE_DIAG_GREEN_MASK 0x10
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#define MODE_DIAG_AMBER_MASK 0x20
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#define MODE_DIAG_GBLINK_MASK 0x00
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#define MODE_DIAG_OFF_MASK 0x30
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#define TYPE_LOC_REG_MASK 0x40
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#define MODE_LOC_OFF_MASK 0x40
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#define MODE_LOC_BLINK_MASK 0x00
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typedef enum onlp_led_mode_e {
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ONLP_LED_MODE_OFF,
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ONLP_LED_MODE_ON,
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ONLP_LED_MODE_BLINKING,
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ONLP_LED_MODE_RED = 10,
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ONLP_LED_MODE_RED_BLINKING = 11,
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ONLP_LED_MODE_ORANGE = 12,
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ONLP_LED_MODE_ORANGE_BLINKING = 13,
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ONLP_LED_MODE_YELLOW = 14,
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ONLP_LED_MODE_YELLOW_BLINKING = 15,
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ONLP_LED_MODE_GREEN = 16,
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ONLP_LED_MODE_GREEN_BLINKING = 17,
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ONLP_LED_MODE_BLUE = 18,
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ONLP_LED_MODE_BLUE_BLINKING = 19,
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ONLP_LED_MODE_PURPLE = 20,
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ONLP_LED_MODE_PURPLE_BLINKING = 21,
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ONLP_LED_MODE_AUTO = 22,
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ONLP_LED_MODE_AUTO_BLINKING = 23,
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} onlp_led_mode_t;
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struct led_type_mode {
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enum led_type type;
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int type_mask;
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enum onlp_led_mode_e mode;
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int mode_mask;
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};
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static struct led_type_mode led_type_mode_data[] = {
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{TYPE_DIAG, TYPE_DIAG_REG_MASK, ONLP_LED_MODE_GREEN_BLINKING, MODE_DIAG_GBLINK_MASK},
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{TYPE_DIAG, TYPE_DIAG_REG_MASK, ONLP_LED_MODE_GREEN, MODE_DIAG_GREEN_MASK},
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{TYPE_DIAG, TYPE_DIAG_REG_MASK, ONLP_LED_MODE_ORANGE, MODE_DIAG_AMBER_MASK},
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{TYPE_DIAG, TYPE_DIAG_REG_MASK, ONLP_LED_MODE_OFF, MODE_DIAG_OFF_MASK},
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{TYPE_LOC, TYPE_LOC_REG_MASK, ONLP_LED_MODE_BLUE_BLINKING, MODE_LOC_BLINK_MASK},
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{TYPE_LOC, TYPE_LOC_REG_MASK, ONLP_LED_MODE_OFF, MODE_LOC_OFF_MASK},
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};
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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(u8 cpld_addr, u8 reg, u8 value);
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static int pdata_init(struct accton_as7315_27xb_led_data *data) {
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int i;
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for (i=0; i<ARRAY_SIZE(led_list) ; i++) {
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data->reg_addr[i] = led_list[i].reg_addr;
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data->slave_addr[i] = led_list[i].slave_addr;
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}
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return 0;
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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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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].type_mask & reg_val) ==
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led_type_mode_data[i].mode_mask)
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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 onlp_led_mode_e 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_mask |
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(reg_val & (~led_type_mode_data[i].type_mask));
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}
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return reg_val;
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}
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static int accton_as7315_27xb_led_read_value(u8 slave, u8 reg)
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{
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return accton_i2c_cpld_read(slave, reg);
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}
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static int accton_as7315_27xb_led_write_value(u8 slave, u8 reg, u8 value)
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{
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return accton_i2c_cpld_write(slave, reg, value);
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}
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static void accton_as7315_27xb_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 accton_as7315_27xb_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;
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u8 addr, offset;
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addr = ledctl->slave_addr[i];
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offset = ledctl->reg_addr[i];
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status = accton_as7315_27xb_led_read_value(addr, offset);
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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", ledctl->reg_addr[i], 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 accton_as7315_27xb_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 addr, offset;
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if (type >= ARRAY_SIZE(led_list)) {
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dev_dbg(&ledctl->pdev->dev, "Illegal type:%d\n", type);
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return;
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}
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mutex_lock(&ledctl->update_lock);
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addr = ledctl->slave_addr[type],
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offset = ledctl->reg_addr[type],
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reg_val = accton_as7315_27xb_led_read_value(addr, offset);
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if (reg_val < 0) {
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dev_dbg(&ledctl->pdev->dev, "reg %d, err %d\n", offset, 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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accton_as7315_27xb_led_write_value(addr, offset, 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 enum led_type get_led_type(struct led_classdev *cdev)
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{
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int i;
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for (i=0; i<ARRAY_SIZE(led_list) ; i++) {
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if (strstr(led_list[i].name, cdev->name))
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return i;
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}
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return -EINVAL;
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}
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static void led_mode_set(struct led_classdev *cdev,
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enum led_brightness led_light_mode)
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{
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enum led_type type;
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type = get_led_type(cdev);
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if (type < 0) {
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dev_dbg(&ledctl->pdev->dev, "Found no corresponding type:%d\n", type);
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return ;
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}
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accton_as7315_27xb_led_set(cdev, led_light_mode, type);
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}
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static enum led_brightness led_mode_get(struct led_classdev *cdev)
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{
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enum led_type type;
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type = get_led_type(cdev);
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if (type < 0)
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return type;
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accton_as7315_27xb_led_update();
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return led_reg_val_to_light_mode(type, ledctl->reg_val[type]);
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}
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static struct led_classdev accton_as7315_27xb_leds[TYPE_MAX] = {
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[TYPE_DIAG] = {
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.name = led_list[TYPE_DIAG].name,
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.default_trigger = "unused",
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.brightness_set = led_mode_set,
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.brightness_get = led_mode_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = ONLP_LED_MODE_AUTO,
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},
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[TYPE_LOC] = {
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.name = led_list[TYPE_LOC].name,
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.default_trigger = "unused",
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.brightness_set = led_mode_set,
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.brightness_get = led_mode_get,
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.flags = LED_CORE_SUSPENDRESUME,
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.max_brightness = ONLP_LED_MODE_AUTO,
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},
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};
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static int accton_as7315_27xb_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(accton_as7315_27xb_leds); i++) {
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led_classdev_suspend(&accton_as7315_27xb_leds[i]);
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}
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return 0;
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}
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static int accton_as7315_27xb_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(accton_as7315_27xb_leds); i++) {
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led_classdev_resume(&accton_as7315_27xb_leds[i]);
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}
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return 0;
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}
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static int accton_as7315_27xb_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(accton_as7315_27xb_leds); i++) {
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ret = led_classdev_register(&pdev->dev, &accton_as7315_27xb_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(accton_as7315_27xb_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(&accton_as7315_27xb_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 accton_as7315_27xb_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(accton_as7315_27xb_leds); i++) {
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led_classdev_unregister(&accton_as7315_27xb_leds[i]);
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}
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return 0;
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}
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static struct platform_driver accton_as7315_27xb_led_driver = {
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.probe = accton_as7315_27xb_led_probe,
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.remove = accton_as7315_27xb_led_remove,
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.suspend = accton_as7315_27xb_led_suspend,
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.resume = accton_as7315_27xb_led_resume,
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|
|
.driver = {
|
||
|
|
.name = DRVNAME,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init accton_as7315_27xb_led_init(void)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = platform_driver_register(&accton_as7315_27xb_led_driver);
|
||
|
|
if (ret < 0) {
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
ledctl = kzalloc(sizeof(struct accton_as7315_27xb_led_data), GFP_KERNEL);
|
||
|
|
if (!ledctl) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
platform_driver_unregister(&accton_as7315_27xb_led_driver);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
pdata_init(ledctl);
|
||
|
|
mutex_init(&ledctl->update_lock);
|
||
|
|
|
||
|
|
ledctl->pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
|
||
|
|
if (IS_ERR(ledctl->pdev)) {
|
||
|
|
ret = PTR_ERR(ledctl->pdev);
|
||
|
|
platform_driver_unregister(&accton_as7315_27xb_led_driver);
|
||
|
|
kfree(ledctl);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit accton_as7315_27xb_led_exit(void)
|
||
|
|
{
|
||
|
|
platform_device_unregister(ledctl->pdev);
|
||
|
|
platform_driver_unregister(&accton_as7315_27xb_led_driver);
|
||
|
|
kfree(ledctl);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(accton_as7315_27xb_led_init);
|
||
|
|
module_exit(accton_as7315_27xb_led_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
|
||
|
|
MODULE_DESCRIPTION("accton_as7315_27xb_led driver");
|
||
|
|
MODULE_LICENSE("GPL");
|