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