Simon Guinot | 11efe71 | 2010-07-06 16:08:46 +0200 | [diff] [blame] | 1 | /* |
| 2 | * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED |
| 3 | * |
| 4 | * Copyright (C) 2010 LaCie |
| 5 | * |
| 6 | * Author: Simon Guinot <sguinot@lacie.com> |
| 7 | * |
| 8 | * Based on leds-gpio.c by Raphael Assenat <raph@8d.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/gpio.h> |
| 30 | #include <linux/leds.h> |
| 31 | #include <mach/leds-ns2.h> |
| 32 | |
| 33 | /* |
| 34 | * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in |
| 35 | * relation with the SATA activity. This capability is exposed through the |
| 36 | * "sata" sysfs attribute. |
| 37 | * |
| 38 | * The following array detail the different LED registers and the combination |
| 39 | * of their possible values: |
| 40 | * |
| 41 | * cmd_led | slow_led | /SATA active | LED state |
| 42 | * | | | |
| 43 | * 1 | 0 | x | off |
| 44 | * - | 1 | x | on |
| 45 | * 0 | 0 | 1 | on |
| 46 | * 0 | 0 | 0 | blink (rate 300ms) |
| 47 | */ |
| 48 | |
| 49 | enum ns2_led_modes { |
| 50 | NS_V2_LED_OFF, |
| 51 | NS_V2_LED_ON, |
| 52 | NS_V2_LED_SATA, |
| 53 | }; |
| 54 | |
| 55 | struct ns2_led_mode_value { |
| 56 | enum ns2_led_modes mode; |
| 57 | int cmd_level; |
| 58 | int slow_level; |
| 59 | }; |
| 60 | |
| 61 | static struct ns2_led_mode_value ns2_led_modval[] = { |
| 62 | { NS_V2_LED_OFF , 1, 0 }, |
| 63 | { NS_V2_LED_ON , 0, 1 }, |
| 64 | { NS_V2_LED_ON , 1, 1 }, |
| 65 | { NS_V2_LED_SATA, 0, 0 }, |
| 66 | }; |
| 67 | |
| 68 | struct ns2_led_data { |
| 69 | struct led_classdev cdev; |
| 70 | unsigned cmd; |
| 71 | unsigned slow; |
| 72 | unsigned char sata; /* True when SATA mode active. */ |
| 73 | rwlock_t rw_lock; /* Lock GPIOs. */ |
| 74 | }; |
| 75 | |
| 76 | static int ns2_led_get_mode(struct ns2_led_data *led_dat, |
| 77 | enum ns2_led_modes *mode) |
| 78 | { |
| 79 | int i; |
| 80 | int ret = -EINVAL; |
| 81 | int cmd_level; |
| 82 | int slow_level; |
| 83 | |
| 84 | read_lock(&led_dat->rw_lock); |
| 85 | |
| 86 | cmd_level = gpio_get_value(led_dat->cmd); |
| 87 | slow_level = gpio_get_value(led_dat->slow); |
| 88 | |
| 89 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { |
| 90 | if (cmd_level == ns2_led_modval[i].cmd_level && |
| 91 | slow_level == ns2_led_modval[i].slow_level) { |
| 92 | *mode = ns2_led_modval[i].mode; |
| 93 | ret = 0; |
| 94 | break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | read_unlock(&led_dat->rw_lock); |
| 99 | |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | static void ns2_led_set_mode(struct ns2_led_data *led_dat, |
| 104 | enum ns2_led_modes mode) |
| 105 | { |
| 106 | int i; |
| 107 | |
| 108 | write_lock(&led_dat->rw_lock); |
| 109 | |
| 110 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { |
| 111 | if (mode == ns2_led_modval[i].mode) { |
| 112 | gpio_set_value(led_dat->cmd, |
| 113 | ns2_led_modval[i].cmd_level); |
| 114 | gpio_set_value(led_dat->slow, |
| 115 | ns2_led_modval[i].slow_level); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | write_unlock(&led_dat->rw_lock); |
| 120 | } |
| 121 | |
| 122 | static void ns2_led_set(struct led_classdev *led_cdev, |
| 123 | enum led_brightness value) |
| 124 | { |
| 125 | struct ns2_led_data *led_dat = |
| 126 | container_of(led_cdev, struct ns2_led_data, cdev); |
| 127 | enum ns2_led_modes mode; |
| 128 | |
| 129 | if (value == LED_OFF) |
| 130 | mode = NS_V2_LED_OFF; |
| 131 | else if (led_dat->sata) |
| 132 | mode = NS_V2_LED_SATA; |
| 133 | else |
| 134 | mode = NS_V2_LED_ON; |
| 135 | |
| 136 | ns2_led_set_mode(led_dat, mode); |
| 137 | } |
| 138 | |
| 139 | static ssize_t ns2_led_sata_store(struct device *dev, |
| 140 | struct device_attribute *attr, |
| 141 | const char *buff, size_t count) |
| 142 | { |
| 143 | int ret; |
| 144 | unsigned long enable; |
| 145 | enum ns2_led_modes mode; |
| 146 | struct ns2_led_data *led_dat = dev_get_drvdata(dev); |
| 147 | |
| 148 | ret = strict_strtoul(buff, 10, &enable); |
| 149 | if (ret < 0) |
| 150 | return ret; |
| 151 | |
| 152 | enable = !!enable; |
| 153 | |
| 154 | if (led_dat->sata == enable) |
| 155 | return count; |
| 156 | |
| 157 | ret = ns2_led_get_mode(led_dat, &mode); |
| 158 | if (ret < 0) |
| 159 | return ret; |
| 160 | |
| 161 | if (enable && mode == NS_V2_LED_ON) |
| 162 | ns2_led_set_mode(led_dat, NS_V2_LED_SATA); |
| 163 | if (!enable && mode == NS_V2_LED_SATA) |
| 164 | ns2_led_set_mode(led_dat, NS_V2_LED_ON); |
| 165 | |
| 166 | led_dat->sata = enable; |
| 167 | |
| 168 | return count; |
| 169 | } |
| 170 | |
| 171 | static ssize_t ns2_led_sata_show(struct device *dev, |
| 172 | struct device_attribute *attr, char *buf) |
| 173 | { |
| 174 | struct ns2_led_data *led_dat = dev_get_drvdata(dev); |
| 175 | |
| 176 | return sprintf(buf, "%d\n", led_dat->sata); |
| 177 | } |
| 178 | |
| 179 | static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store); |
| 180 | |
| 181 | static int __devinit |
| 182 | create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat, |
| 183 | const struct ns2_led *template) |
| 184 | { |
| 185 | int ret; |
| 186 | enum ns2_led_modes mode; |
| 187 | |
| 188 | ret = gpio_request(template->cmd, template->name); |
| 189 | if (ret == 0) { |
| 190 | ret = gpio_direction_output(template->cmd, |
| 191 | gpio_get_value(template->cmd)); |
| 192 | if (ret) |
| 193 | gpio_free(template->cmd); |
| 194 | } |
| 195 | if (ret) { |
| 196 | dev_err(&pdev->dev, "%s: failed to setup command GPIO\n", |
| 197 | template->name); |
| 198 | } |
| 199 | |
| 200 | ret = gpio_request(template->slow, template->name); |
| 201 | if (ret == 0) { |
| 202 | ret = gpio_direction_output(template->slow, |
| 203 | gpio_get_value(template->slow)); |
| 204 | if (ret) |
| 205 | gpio_free(template->slow); |
| 206 | } |
| 207 | if (ret) { |
| 208 | dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n", |
| 209 | template->name); |
| 210 | goto err_free_cmd; |
| 211 | } |
| 212 | |
| 213 | rwlock_init(&led_dat->rw_lock); |
| 214 | |
| 215 | led_dat->cdev.name = template->name; |
| 216 | led_dat->cdev.default_trigger = template->default_trigger; |
| 217 | led_dat->cdev.blink_set = NULL; |
| 218 | led_dat->cdev.brightness_set = ns2_led_set; |
| 219 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
| 220 | led_dat->cmd = template->cmd; |
| 221 | led_dat->slow = template->slow; |
| 222 | |
| 223 | ret = ns2_led_get_mode(led_dat, &mode); |
| 224 | if (ret < 0) |
| 225 | goto err_free_slow; |
| 226 | |
| 227 | /* Set LED initial state. */ |
| 228 | led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0; |
| 229 | led_dat->cdev.brightness = |
| 230 | (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL; |
| 231 | |
| 232 | ret = led_classdev_register(&pdev->dev, &led_dat->cdev); |
| 233 | if (ret < 0) |
| 234 | goto err_free_slow; |
| 235 | |
| 236 | dev_set_drvdata(led_dat->cdev.dev, led_dat); |
| 237 | ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); |
| 238 | if (ret < 0) |
| 239 | goto err_free_cdev; |
| 240 | |
| 241 | return 0; |
| 242 | |
| 243 | err_free_cdev: |
| 244 | led_classdev_unregister(&led_dat->cdev); |
| 245 | err_free_slow: |
| 246 | gpio_free(led_dat->slow); |
| 247 | err_free_cmd: |
| 248 | gpio_free(led_dat->cmd); |
| 249 | |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | static void __devexit delete_ns2_led(struct ns2_led_data *led_dat) |
| 254 | { |
| 255 | device_remove_file(led_dat->cdev.dev, &dev_attr_sata); |
| 256 | led_classdev_unregister(&led_dat->cdev); |
| 257 | gpio_free(led_dat->cmd); |
| 258 | gpio_free(led_dat->slow); |
| 259 | } |
| 260 | |
| 261 | static int __devinit ns2_led_probe(struct platform_device *pdev) |
| 262 | { |
| 263 | struct ns2_led_platform_data *pdata = pdev->dev.platform_data; |
| 264 | struct ns2_led_data *leds_data; |
| 265 | int i; |
| 266 | int ret; |
| 267 | |
| 268 | if (!pdata) |
| 269 | return -EINVAL; |
| 270 | |
| 271 | leds_data = kzalloc(sizeof(struct ns2_led_data) * |
| 272 | pdata->num_leds, GFP_KERNEL); |
| 273 | if (!leds_data) |
| 274 | return -ENOMEM; |
| 275 | |
| 276 | for (i = 0; i < pdata->num_leds; i++) { |
| 277 | ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]); |
| 278 | if (ret < 0) |
| 279 | goto err; |
| 280 | |
| 281 | } |
| 282 | |
| 283 | platform_set_drvdata(pdev, leds_data); |
| 284 | |
| 285 | return 0; |
| 286 | |
| 287 | err: |
| 288 | for (i = i - 1; i >= 0; i--) |
| 289 | delete_ns2_led(&leds_data[i]); |
| 290 | |
| 291 | kfree(leds_data); |
| 292 | |
| 293 | return ret; |
| 294 | } |
| 295 | |
| 296 | static int __devexit ns2_led_remove(struct platform_device *pdev) |
| 297 | { |
| 298 | int i; |
| 299 | struct ns2_led_platform_data *pdata = pdev->dev.platform_data; |
| 300 | struct ns2_led_data *leds_data; |
| 301 | |
| 302 | leds_data = platform_get_drvdata(pdev); |
| 303 | |
| 304 | for (i = 0; i < pdata->num_leds; i++) |
| 305 | delete_ns2_led(&leds_data[i]); |
| 306 | |
| 307 | kfree(leds_data); |
| 308 | platform_set_drvdata(pdev, NULL); |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static struct platform_driver ns2_led_driver = { |
| 314 | .probe = ns2_led_probe, |
| 315 | .remove = __devexit_p(ns2_led_remove), |
| 316 | .driver = { |
| 317 | .name = "leds-ns2", |
| 318 | .owner = THIS_MODULE, |
| 319 | }, |
| 320 | }; |
| 321 | MODULE_ALIAS("platform:leds-ns2"); |
| 322 | |
| 323 | static int __init ns2_led_init(void) |
| 324 | { |
| 325 | return platform_driver_register(&ns2_led_driver); |
| 326 | } |
| 327 | |
| 328 | static void __exit ns2_led_exit(void) |
| 329 | { |
| 330 | platform_driver_unregister(&ns2_led_driver); |
| 331 | } |
| 332 | |
| 333 | module_init(ns2_led_init); |
| 334 | module_exit(ns2_led_exit); |
| 335 | |
| 336 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); |
| 337 | MODULE_DESCRIPTION("Network Space v2 LED driver"); |
| 338 | MODULE_LICENSE("GPL"); |