target/linux/ifxmips/files/drivers/leds/leds-ifxmips.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2006 infineon
  17  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/version.h>
  24 #include <linux/types.h>
  25 #include <linux/fs.h>
  26 #include <linux/init.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/unistd.h>
  30 #include <linux/errno.h>
  31 #include <linux/leds.h>
  32 #include <linux/delay.h>
  33
  34 #include <asm/ifxmips/ifxmips.h>
  35 #include <asm/ifxmips/ifxmips_gpio.h>
  36 #include <asm/ifxmips/ifxmips_pmu.h>
  37
  38 #define DRVNAME                                 "ifxmips_led"
  39
  40 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_FALLING
  41 //#define IFXMIPS_LED_CLK_EDGE                  IFXMIPS_LED_RISING
  42
  43 #define IFXMIPS_LED_SPEED                       IFXMIPS_LED_8HZ
  44
  45 #define IFXMIPS_LED_GPIO_PORT                   0
  46
  47 #define IFXMIPS_MAX_LED                         24
  48
  49 struct ifxmips_led {
  50         struct led_classdev cdev;
  51         u8 bit;
  52 };
  53
  54 void ifxmips_led_set (unsigned int led)
  55 {
  56         led &= 0xffffff;
  57         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) | led, IFXMIPS_LED_CPU0);
  58 }
  59 EXPORT_SYMBOL(ifxmips_led_set);
  60
  61 void ifxmips_led_clear (unsigned int led)
  62 {
  63         led = ~(led & 0xffffff);
  64         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) & led, IFXMIPS_LED_CPU0);
  65 }
  66 EXPORT_SYMBOL(ifxmips_led_clear);
  67
  68 void ifxmips_led_blink_set (unsigned int led)
  69 {
  70         led &= 0xffffff;
  71         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | led, IFXMIPS_LED_CON0);
  72 }
  73 EXPORT_SYMBOL(ifxmips_led_blink_set);
  74
  75 void ifxmips_led_blink_clear (unsigned int led)
  76 {
  77         led = ~(led & 0xffffff);
  78         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & led, IFXMIPS_LED_CON0);
  79 }
  80 EXPORT_SYMBOL(ifxmips_led_blink_clear);
  81
  82 void ifxmips_ledapi_set(struct led_classdev *led_cdev, enum led_brightness value)
  83 {
  84         struct ifxmips_led *led_dev = container_of(led_cdev, struct ifxmips_led, cdev);
  85
  86         if(value)
  87                 ifxmips_led_set(1 << led_dev->bit);
  88         else
  89                 ifxmips_led_clear(1 << led_dev->bit);
  90 }
  91
  92 void ifxmips_led_setup_gpio (void)
  93 {
  94         int i = 0;
  95
  96         /* we need to setup pins SH,D,ST (4,5,6) */
  97         for (i = 4; i < 7; i++) {
  98                 ifxmips_port_set_altsel0(IFXMIPS_LED_GPIO_PORT, i);
  99                 ifxmips_port_clear_altsel1(IFXMIPS_LED_GPIO_PORT, i);
 100                 ifxmips_port_set_dir_out(IFXMIPS_LED_GPIO_PORT, i);
 101                 ifxmips_port_set_open_drain(IFXMIPS_LED_GPIO_PORT, i);
 102         }
 103 }
 104
 105 static int ifxmips_led_probe(struct platform_device *dev)
 106 {
 107         int i = 0;
 108
 109         ifxmips_led_setup_gpio();
 110
 111         ifxmips_w32(0, IFXMIPS_LED_AR);
 112         ifxmips_w32(0, IFXMIPS_LED_CPU0);
 113         ifxmips_w32(0, IFXMIPS_LED_CPU1);
 114         ifxmips_w32(LED_CON0_SWU, IFXMIPS_LED_CON0);
 115         ifxmips_w32(0, IFXMIPS_LED_CON1);
 116
 117         /* setup the clock edge that the shift register is triggered on */
 118         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & ~IFXMIPS_LED_EDGE_MASK, IFXMIPS_LED_CON0);
 119         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_CLK_EDGE, IFXMIPS_LED_CON0);
 120
 121         /* per default leds 15-0 are set */
 122         ifxmips_w32(IFXMIPS_LED_GROUP1 | IFXMIPS_LED_GROUP0, IFXMIPS_LED_CON1);
 123
 124         /* leds are update periodically by the FPID */
 125         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_UPD_MASK, IFXMIPS_LED_CON1);
 126         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_UPD_SRC_FPI, IFXMIPS_LED_CON1);
 127
 128         /* set led update speed */
 129         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_MASK, IFXMIPS_LED_CON1);
 130         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_SPEED, IFXMIPS_LED_CON1);
 131
 132         /* adsl 0 and 1 leds are updated by the arc */
 133         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_ADSL_SRC, IFXMIPS_LED_CON0);
 134
 135         /* per default, the leds are turned on */
 136         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_LED);
 137
 138         for (i = 0; i < IFXMIPS_MAX_LED; i++) {
 139                 struct ifxmips_led *tmp = kzalloc(sizeof(struct ifxmips_led), GFP_KERNEL);
 140                 tmp->cdev.brightness_set = ifxmips_ledapi_set;
 141                 tmp->cdev.name = kmalloc(sizeof("ifxmips:led:00"), GFP_KERNEL);
 142                 sprintf((char *)tmp->cdev.name, "ifxmips:led:%02d", i);
 143                 tmp->cdev.default_trigger = NULL;
 144                 tmp->bit = i;
 145                 led_classdev_register(&dev->dev, &tmp->cdev);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int ifxmips_led_remove(struct platform_device *pdev)
 152 {
 153         return 0;
 154 }
 155
 156 static struct platform_driver ifxmips_led_driver = {
 157         .probe = ifxmips_led_probe,
 158         .remove = ifxmips_led_remove,
 159         .driver = {
 160                 .name = DRVNAME,
 161                 .owner = THIS_MODULE,
 162         },
 163 };
 164
 165 int __init ifxmips_led_init (void)
 166 {
 167         int ret = platform_driver_register(&ifxmips_led_driver);
 168         if (ret)
 169                 printk(KERN_INFO "ifxmips_led: Error registering platfom driver!");
 170
 171         return ret;
 172 }
 173
 174 void __exit ifxmips_led_exit (void)
 175 {
 176         platform_driver_unregister(&ifxmips_led_driver);
 177 }
 178
 179 module_init(ifxmips_led_init);
 180 module_exit(ifxmips_led_exit);