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 #if 1
  41 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_FALLING
  42 #else
  43 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_RISING
  44 #endif
  45
  46 #define IFXMIPS_LED_SPEED                       IFXMIPS_LED_8HZ
  47
  48 #define IFXMIPS_LED_GPIO_PORT                   0
  49
  50 #define IFXMIPS_MAX_LED                         24
  51
  52 struct ifxmips_led {
  53         struct led_classdev cdev;
  54         u8 bit;
  55 };
  56
  57 void ifxmips_led_set(unsigned int led)
  58 {
  59         led &= 0xffffff;
  60         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) | led, IFXMIPS_LED_CPU0);
  61 }
  62 EXPORT_SYMBOL(ifxmips_led_set);
  63
  64 void ifxmips_led_clear(unsigned int led)
  65 {
  66         led = ~(led & 0xffffff);
  67         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) & led, IFXMIPS_LED_CPU0);
  68 }
  69 EXPORT_SYMBOL(ifxmips_led_clear);
  70
  71 void ifxmips_led_blink_set(unsigned int led)
  72 {
  73         led &= 0xffffff;
  74         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | led, IFXMIPS_LED_CON0);
  75 }
  76 EXPORT_SYMBOL(ifxmips_led_blink_set);
  77
  78 void ifxmips_led_blink_clear(unsigned int led)
  79 {
  80         led = ~(led & 0xffffff);
  81         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & led, IFXMIPS_LED_CON0);
  82 }
  83 EXPORT_SYMBOL(ifxmips_led_blink_clear);
  84
  85 static void ifxmips_ledapi_set(struct led_classdev *led_cdev,
  86         enum led_brightness value)
  87 {
  88         struct ifxmips_led *led_dev =
  89                 container_of(led_cdev, struct ifxmips_led, cdev);
  90
  91         if (value)
  92                 ifxmips_led_set(1 << led_dev->bit);
  93         else
  94                 ifxmips_led_clear(1 << led_dev->bit);
  95 }
  96
  97 void ifxmips_led_setup_gpio(void)
  98 {
  99         int i = 0;
 100
 101         /* we need to setup pins SH,D,ST (4,5,6) */
 102         for (i = 4; i < 7; i++) {
 103                 ifxmips_port_set_altsel0(IFXMIPS_LED_GPIO_PORT, i);
 104                 ifxmips_port_clear_altsel1(IFXMIPS_LED_GPIO_PORT, i);
 105                 ifxmips_port_set_dir_out(IFXMIPS_LED_GPIO_PORT, i);
 106                 ifxmips_port_set_open_drain(IFXMIPS_LED_GPIO_PORT, i);
 107         }
 108 }
 109
 110 static int ifxmips_led_probe(struct platform_device *dev)
 111 {
 112         int i = 0;
 113
 114         ifxmips_led_setup_gpio();
 115
 116         ifxmips_w32(0, IFXMIPS_LED_AR);
 117         ifxmips_w32(0, IFXMIPS_LED_CPU0);
 118         ifxmips_w32(0, IFXMIPS_LED_CPU1);
 119         ifxmips_w32(LED_CON0_SWU, IFXMIPS_LED_CON0);
 120         ifxmips_w32(0, IFXMIPS_LED_CON1);
 121
 122         /* setup the clock edge that the shift register is triggered on */
 123         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & ~IFXMIPS_LED_EDGE_MASK,
 124                 IFXMIPS_LED_CON0);
 125         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_CLK_EDGE,
 126                 IFXMIPS_LED_CON0);
 127
 128         /* per default leds 15-0 are set */
 129         ifxmips_w32(IFXMIPS_LED_GROUP1 | IFXMIPS_LED_GROUP0, IFXMIPS_LED_CON1);
 130
 131         /* leds are update periodically by the FPID */
 132         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_UPD_MASK,
 133                 IFXMIPS_LED_CON1);
 134         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_UPD_SRC_FPI,
 135                 IFXMIPS_LED_CON1);
 136
 137         /* set led update speed */
 138         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_MASK,
 139                 IFXMIPS_LED_CON1);
 140         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_SPEED,
 141                 IFXMIPS_LED_CON1);
 142
 143         /* adsl 0 and 1 leds are updated by the arc */
 144         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_ADSL_SRC,
 145                 IFXMIPS_LED_CON0);
 146
 147         /* per default, the leds are turned on */
 148         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_LED);
 149
 150         for (i = 0; i < IFXMIPS_MAX_LED; i++) {
 151                 struct ifxmips_led *tmp =
 152                         kzalloc(sizeof(struct ifxmips_led), GFP_KERNEL);
 153                 tmp->cdev.brightness_set = ifxmips_ledapi_set;
 154                 tmp->cdev.name = kmalloc(sizeof("ifxmips:led:00"), GFP_KERNEL);
 155                 sprintf((char *)tmp->cdev.name, "ifxmips:led:%02d", i);
 156                 tmp->cdev.default_trigger = NULL;
 157                 tmp->bit = i;
 158                 led_classdev_register(&dev->dev, &tmp->cdev);
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int ifxmips_led_remove(struct platform_device *pdev)
 165 {
 166         return 0;
 167 }
 168
 169 static struct platform_driver ifxmips_led_driver = {
 170         .probe = ifxmips_led_probe,
 171         .remove = ifxmips_led_remove,
 172         .driver = {
 173                 .name = DRVNAME,
 174                 .owner = THIS_MODULE,
 175         },
 176 };
 177
 178 int __init ifxmips_led_init(void)
 179 {
 180         int ret = platform_driver_register(&ifxmips_led_driver);
 181         if (ret)
 182                 printk(KERN_INFO
 183                         "ifxmips_led: Error registering platfom driver!");
 184
 185         return ret;
 186 }
 187
 188 void __exit ifxmips_led_exit(void)
 189 {
 190         platform_driver_unregister(&ifxmips_led_driver);
 191 }
 192
 193 module_init(ifxmips_led_init);
 194 module_exit(ifxmips_led_exit);