| 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 <ifxmips.h> |
| 35 | #include <ifxmips_gpio.h> |
| 36 | #include <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); |
| 197 | |
