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/slab.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/version.h>
  25 #include <linux/types.h>
  26 #include <linux/fs.h>
  27 #include <linux/init.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/unistd.h>
  31 #include <linux/errno.h>
  32 #include <linux/leds.h>
  33 #include <linux/delay.h>
  34
  35 #include <ifxmips.h>
  36 #include <ifxmips_gpio.h>
  37 #include <ifxmips_pmu.h>
  38
  39 #define DRVNAME                                 "ifxmips_led"
  40
  41 /* might need to be changed depending on shift register used on the pcb */
  42 #if 1
  43 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_FALLING
  44 #else
  45 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_RISING
  46 #endif
  47
  48 #define IFXMIPS_LED_SPEED                       IFXMIPS_LED_8HZ
  49
  50 #define IFXMIPS_LED_GPIO_PORT                   0
  51
  52 #define IFXMIPS_MAX_LED                         24
  53
  54 struct ifxmips_led {
  55         struct led_classdev cdev;
  56         u8 bit;
  57 };
  58
  59 void ifxmips_led_set(unsigned int led)
  60 {
  61         led &= 0xffffff;
  62         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) | led, IFXMIPS_LED_CPU0);
  63 }
  64 EXPORT_SYMBOL(ifxmips_led_set);
  65
  66 void ifxmips_led_clear(unsigned int led)
  67 {
  68         led = ~(led & 0xffffff);
  69         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CPU0) & led, IFXMIPS_LED_CPU0);
  70 }
  71 EXPORT_SYMBOL(ifxmips_led_clear);
  72
  73 void ifxmips_led_blink_set(unsigned int led)
  74 {
  75         led &= 0xffffff;
  76         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | led, IFXMIPS_LED_CON0);
  77 }
  78 EXPORT_SYMBOL(ifxmips_led_blink_set);
  79
  80 void ifxmips_led_blink_clear(unsigned int led)
  81 {
  82         led = ~(led & 0xffffff);
  83         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & led, IFXMIPS_LED_CON0);
  84 }
  85 EXPORT_SYMBOL(ifxmips_led_blink_clear);
  86
  87 static void ifxmips_ledapi_set(struct led_classdev *led_cdev,
  88         enum led_brightness value)
  89 {
  90         struct ifxmips_led *led_dev =
  91                 container_of(led_cdev, struct ifxmips_led, cdev);
  92
  93         if (value)
  94                 ifxmips_led_set(1 << led_dev->bit);
  95         else
  96                 ifxmips_led_clear(1 << led_dev->bit);
  97 }
  98
  99 void ifxmips_led_setup_gpio(void)
 100 {
 101         int i = 0;
 102
 103         /* leds are controlled via a shift register
 104            we need to setup pins SH,D,ST (4,5,6) to make it work */
 105         for (i = 4; i < 7; i++) {
 106                 ifxmips_port_set_altsel0(IFXMIPS_LED_GPIO_PORT, i);
 107                 ifxmips_port_clear_altsel1(IFXMIPS_LED_GPIO_PORT, i);
 108                 ifxmips_port_set_dir_out(IFXMIPS_LED_GPIO_PORT, i);
 109                 ifxmips_port_set_open_drain(IFXMIPS_LED_GPIO_PORT, i);
 110         }
 111 }
 112
 113 static int ifxmips_led_probe(struct platform_device *dev)
 114 {
 115         int i = 0;
 116
 117         ifxmips_led_setup_gpio();
 118
 119         ifxmips_w32(0, IFXMIPS_LED_AR);
 120         ifxmips_w32(0, IFXMIPS_LED_CPU0);
 121         ifxmips_w32(0, IFXMIPS_LED_CPU1);
 122         ifxmips_w32(LED_CON0_SWU, IFXMIPS_LED_CON0);
 123         ifxmips_w32(0, IFXMIPS_LED_CON1);
 124
 125         /* setup the clock edge that the shift register is triggered on */
 126         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) & ~IFXMIPS_LED_EDGE_MASK,
 127                 IFXMIPS_LED_CON0);
 128         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_CLK_EDGE,
 129                 IFXMIPS_LED_CON0);
 130
 131         /* per default leds 15-0 are set */
 132         ifxmips_w32(IFXMIPS_LED_GROUP1 | IFXMIPS_LED_GROUP0, IFXMIPS_LED_CON1);
 133
 134         /* leds are update periodically by the FPID */
 135         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_UPD_MASK,
 136                 IFXMIPS_LED_CON1);
 137         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_UPD_SRC_FPI,
 138                 IFXMIPS_LED_CON1);
 139
 140         /* set led update speed */
 141         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_MASK,
 142                 IFXMIPS_LED_CON1);
 143         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON1) | IFXMIPS_LED_SPEED,
 144                 IFXMIPS_LED_CON1);
 145
 146         /* adsl 0 and 1 leds are updated by the arc */
 147         ifxmips_w32(ifxmips_r32(IFXMIPS_LED_CON0) | IFXMIPS_LED_ADSL_SRC,
 148                 IFXMIPS_LED_CON0);
 149
 150         /* per default, the leds are turned on */
 151         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_LED);
 152
 153         for (i = 0; i < IFXMIPS_MAX_LED; i++) {
 154                 struct ifxmips_led *tmp =
 155                         kzalloc(sizeof(struct ifxmips_led), GFP_KERNEL);
 156                 tmp->cdev.brightness_set = ifxmips_ledapi_set;
 157                 tmp->cdev.name = kmalloc(sizeof("ifxmips:led:00"), GFP_KERNEL);
 158                 sprintf((char *)tmp->cdev.name, "ifxmips:led:%02d", i);
 159                 tmp->cdev.default_trigger = NULL;
 160                 tmp->bit = i;
 161                 led_classdev_register(&dev->dev, &tmp->cdev);
 162         }
 163
 164         return 0;
 165 }
 166
 167 static int ifxmips_led_remove(struct platform_device *pdev)
 168 {
 169         return 0;
 170 }
 171
 172 static struct platform_driver ifxmips_led_driver = {
 173         .probe = ifxmips_led_probe,
 174         .remove = ifxmips_led_remove,
 175         .driver = {
 176                 .name = DRVNAME,
 177                 .owner = THIS_MODULE,
 178         },
 179 };
 180
 181 int __init ifxmips_led_init(void)
 182 {
 183         int ret = platform_driver_register(&ifxmips_led_driver);
 184         if (ret)
 185                 printk(KERN_INFO
 186                         "ifxmips_led: Error registering platfom driver!");
 187
 188         return ret;
 189 }
 190
 191 void __exit ifxmips_led_exit(void)
 192 {
 193         platform_driver_unregister(&ifxmips_led_driver);
 194 }
 195
 196 module_init(ifxmips_led_init);
 197 module_exit(ifxmips_led_exit);