Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 1 | /* |
| 2 | * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs |
| 3 | * |
| 4 | * Copyright (C) 2010 LaCie |
| 5 | * |
| 6 | * Author: Simon Guinot <sguinot@lacie.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/irq.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/gpio.h> |
| 30 | #include <linux/leds.h> |
| 31 | #include <mach/leds-netxbig.h> |
| 32 | |
| 33 | /* |
| 34 | * GPIO extension bus. |
| 35 | */ |
| 36 | |
| 37 | static DEFINE_SPINLOCK(gpio_ext_lock); |
| 38 | |
| 39 | static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr) |
| 40 | { |
| 41 | int pin; |
| 42 | |
| 43 | for (pin = 0; pin < gpio_ext->num_addr; pin++) |
| 44 | gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1); |
| 45 | } |
| 46 | |
| 47 | static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data) |
| 48 | { |
| 49 | int pin; |
| 50 | |
| 51 | for (pin = 0; pin < gpio_ext->num_data; pin++) |
| 52 | gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1); |
| 53 | } |
| 54 | |
| 55 | static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext) |
| 56 | { |
| 57 | /* Enable select is done on the raising edge. */ |
| 58 | gpio_set_value(gpio_ext->enable, 0); |
| 59 | gpio_set_value(gpio_ext->enable, 1); |
| 60 | } |
| 61 | |
| 62 | static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext, |
| 63 | int addr, int value) |
| 64 | { |
| 65 | unsigned long flags; |
| 66 | |
| 67 | spin_lock_irqsave(&gpio_ext_lock, flags); |
| 68 | gpio_ext_set_addr(gpio_ext, addr); |
| 69 | gpio_ext_set_data(gpio_ext, value); |
| 70 | gpio_ext_enable_select(gpio_ext); |
| 71 | spin_unlock_irqrestore(&gpio_ext_lock, flags); |
| 72 | } |
| 73 | |
| 74 | static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext) |
| 75 | { |
| 76 | int err; |
| 77 | int i; |
| 78 | |
| 79 | if (unlikely(!gpio_ext)) |
| 80 | return -EINVAL; |
| 81 | |
| 82 | /* Configure address GPIOs. */ |
| 83 | for (i = 0; i < gpio_ext->num_addr; i++) { |
Axel Lin | b96a573 | 2012-01-10 15:09:37 -0800 | [diff] [blame^] | 84 | err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW, |
| 85 | "GPIO extension addr"); |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 86 | if (err) |
| 87 | goto err_free_addr; |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 88 | } |
| 89 | /* Configure data GPIOs. */ |
| 90 | for (i = 0; i < gpio_ext->num_data; i++) { |
Axel Lin | b96a573 | 2012-01-10 15:09:37 -0800 | [diff] [blame^] | 91 | err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW, |
| 92 | "GPIO extension data"); |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 93 | if (err) |
| 94 | goto err_free_data; |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 95 | } |
| 96 | /* Configure "enable select" GPIO. */ |
Axel Lin | b96a573 | 2012-01-10 15:09:37 -0800 | [diff] [blame^] | 97 | err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW, |
| 98 | "GPIO extension enable"); |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 99 | if (err) |
| 100 | goto err_free_data; |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 101 | |
| 102 | return 0; |
| 103 | |
| 104 | err_free_data: |
| 105 | for (i = i - 1; i >= 0; i--) |
| 106 | gpio_free(gpio_ext->data[i]); |
| 107 | i = gpio_ext->num_addr; |
| 108 | err_free_addr: |
| 109 | for (i = i - 1; i >= 0; i--) |
| 110 | gpio_free(gpio_ext->addr[i]); |
| 111 | |
| 112 | return err; |
| 113 | } |
| 114 | |
| 115 | static void __devexit gpio_ext_free(struct netxbig_gpio_ext *gpio_ext) |
| 116 | { |
| 117 | int i; |
| 118 | |
| 119 | gpio_free(gpio_ext->enable); |
| 120 | for (i = gpio_ext->num_addr - 1; i >= 0; i--) |
| 121 | gpio_free(gpio_ext->addr[i]); |
| 122 | for (i = gpio_ext->num_data - 1; i >= 0; i--) |
| 123 | gpio_free(gpio_ext->data[i]); |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * Class LED driver. |
| 128 | */ |
| 129 | |
| 130 | struct netxbig_led_data { |
| 131 | struct netxbig_gpio_ext *gpio_ext; |
| 132 | struct led_classdev cdev; |
| 133 | int mode_addr; |
| 134 | int *mode_val; |
| 135 | int bright_addr; |
| 136 | int bright_max; |
| 137 | struct netxbig_led_timer *timer; |
| 138 | int num_timer; |
| 139 | enum netxbig_led_mode mode; |
| 140 | int sata; |
| 141 | spinlock_t lock; |
| 142 | }; |
| 143 | |
| 144 | static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode, |
| 145 | unsigned long delay_on, |
| 146 | unsigned long delay_off, |
| 147 | struct netxbig_led_timer *timer, |
| 148 | int num_timer) |
| 149 | { |
| 150 | int i; |
| 151 | |
| 152 | for (i = 0; i < num_timer; i++) { |
| 153 | if (timer[i].delay_on == delay_on && |
| 154 | timer[i].delay_off == delay_off) { |
| 155 | *mode = timer[i].mode; |
| 156 | return 0; |
| 157 | } |
| 158 | } |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | |
| 162 | static int netxbig_led_blink_set(struct led_classdev *led_cdev, |
| 163 | unsigned long *delay_on, |
| 164 | unsigned long *delay_off) |
| 165 | { |
| 166 | struct netxbig_led_data *led_dat = |
| 167 | container_of(led_cdev, struct netxbig_led_data, cdev); |
| 168 | enum netxbig_led_mode mode; |
| 169 | int mode_val; |
| 170 | int ret; |
| 171 | |
| 172 | /* Look for a LED mode with the requested timer frequency. */ |
| 173 | ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off, |
| 174 | led_dat->timer, led_dat->num_timer); |
| 175 | if (ret < 0) |
| 176 | return ret; |
| 177 | |
| 178 | mode_val = led_dat->mode_val[mode]; |
| 179 | if (mode_val == NETXBIG_LED_INVALID_MODE) |
| 180 | return -EINVAL; |
| 181 | |
| 182 | spin_lock_irq(&led_dat->lock); |
| 183 | |
| 184 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
| 185 | led_dat->mode = mode; |
| 186 | |
| 187 | spin_unlock_irq(&led_dat->lock); |
| 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static void netxbig_led_set(struct led_classdev *led_cdev, |
| 193 | enum led_brightness value) |
| 194 | { |
| 195 | struct netxbig_led_data *led_dat = |
| 196 | container_of(led_cdev, struct netxbig_led_data, cdev); |
| 197 | enum netxbig_led_mode mode; |
| 198 | int mode_val, bright_val; |
| 199 | int set_brightness = 1; |
| 200 | unsigned long flags; |
| 201 | |
| 202 | spin_lock_irqsave(&led_dat->lock, flags); |
| 203 | |
| 204 | if (value == LED_OFF) { |
| 205 | mode = NETXBIG_LED_OFF; |
| 206 | set_brightness = 0; |
| 207 | } else { |
| 208 | if (led_dat->sata) |
| 209 | mode = NETXBIG_LED_SATA; |
| 210 | else if (led_dat->mode == NETXBIG_LED_OFF) |
| 211 | mode = NETXBIG_LED_ON; |
| 212 | else /* Keep 'timer' mode. */ |
| 213 | mode = led_dat->mode; |
| 214 | } |
| 215 | mode_val = led_dat->mode_val[mode]; |
| 216 | |
| 217 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
| 218 | led_dat->mode = mode; |
| 219 | /* |
| 220 | * Note that the brightness register is shared between all the |
| 221 | * SATA LEDs. So, change the brightness setting for a single |
| 222 | * SATA LED will affect all the others. |
| 223 | */ |
| 224 | if (set_brightness) { |
| 225 | bright_val = DIV_ROUND_UP(value * led_dat->bright_max, |
| 226 | LED_FULL); |
| 227 | gpio_ext_set_value(led_dat->gpio_ext, |
| 228 | led_dat->bright_addr, bright_val); |
| 229 | } |
| 230 | |
| 231 | spin_unlock_irqrestore(&led_dat->lock, flags); |
| 232 | } |
| 233 | |
| 234 | static ssize_t netxbig_led_sata_store(struct device *dev, |
| 235 | struct device_attribute *attr, |
| 236 | const char *buff, size_t count) |
| 237 | { |
| 238 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 239 | struct netxbig_led_data *led_dat = |
| 240 | container_of(led_cdev, struct netxbig_led_data, cdev); |
| 241 | unsigned long enable; |
| 242 | enum netxbig_led_mode mode; |
| 243 | int mode_val; |
| 244 | int ret; |
| 245 | |
| 246 | ret = strict_strtoul(buff, 10, &enable); |
| 247 | if (ret < 0) |
| 248 | return ret; |
| 249 | |
| 250 | enable = !!enable; |
| 251 | |
| 252 | spin_lock_irq(&led_dat->lock); |
| 253 | |
| 254 | if (led_dat->sata == enable) { |
| 255 | ret = count; |
| 256 | goto exit_unlock; |
| 257 | } |
| 258 | |
| 259 | if (led_dat->mode != NETXBIG_LED_ON && |
| 260 | led_dat->mode != NETXBIG_LED_SATA) |
| 261 | mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */ |
| 262 | else if (enable) |
| 263 | mode = NETXBIG_LED_SATA; |
| 264 | else |
| 265 | mode = NETXBIG_LED_ON; |
| 266 | |
| 267 | mode_val = led_dat->mode_val[mode]; |
| 268 | if (mode_val == NETXBIG_LED_INVALID_MODE) { |
| 269 | ret = -EINVAL; |
| 270 | goto exit_unlock; |
| 271 | } |
| 272 | |
| 273 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
| 274 | led_dat->mode = mode; |
| 275 | led_dat->sata = enable; |
| 276 | |
| 277 | ret = count; |
| 278 | |
| 279 | exit_unlock: |
| 280 | spin_unlock_irq(&led_dat->lock); |
| 281 | |
| 282 | return ret; |
| 283 | } |
| 284 | |
| 285 | static ssize_t netxbig_led_sata_show(struct device *dev, |
| 286 | struct device_attribute *attr, char *buf) |
| 287 | { |
| 288 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 289 | struct netxbig_led_data *led_dat = |
| 290 | container_of(led_cdev, struct netxbig_led_data, cdev); |
| 291 | |
| 292 | return sprintf(buf, "%d\n", led_dat->sata); |
| 293 | } |
| 294 | |
| 295 | static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store); |
| 296 | |
| 297 | static void __devexit delete_netxbig_led(struct netxbig_led_data *led_dat) |
| 298 | { |
| 299 | if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) |
| 300 | device_remove_file(led_dat->cdev.dev, &dev_attr_sata); |
| 301 | led_classdev_unregister(&led_dat->cdev); |
| 302 | } |
| 303 | |
| 304 | static int __devinit |
| 305 | create_netxbig_led(struct platform_device *pdev, |
| 306 | struct netxbig_led_data *led_dat, |
| 307 | const struct netxbig_led *template) |
| 308 | { |
| 309 | struct netxbig_led_platform_data *pdata = pdev->dev.platform_data; |
| 310 | int ret; |
| 311 | |
| 312 | spin_lock_init(&led_dat->lock); |
| 313 | led_dat->gpio_ext = pdata->gpio_ext; |
| 314 | led_dat->cdev.name = template->name; |
| 315 | led_dat->cdev.default_trigger = template->default_trigger; |
| 316 | led_dat->cdev.blink_set = netxbig_led_blink_set; |
| 317 | led_dat->cdev.brightness_set = netxbig_led_set; |
| 318 | /* |
| 319 | * Because the GPIO extension bus don't allow to read registers |
| 320 | * value, there is no way to probe the LED initial state. |
| 321 | * So, the initial sysfs LED value for the "brightness" and "sata" |
| 322 | * attributes are inconsistent. |
| 323 | * |
| 324 | * Note that the initial LED state can't be reconfigured. |
| 325 | * The reason is that the LED behaviour must stay uniform during |
| 326 | * the whole boot process (bootloader+linux). |
| 327 | */ |
| 328 | led_dat->sata = 0; |
| 329 | led_dat->cdev.brightness = LED_OFF; |
| 330 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
| 331 | led_dat->mode_addr = template->mode_addr; |
| 332 | led_dat->mode_val = template->mode_val; |
| 333 | led_dat->bright_addr = template->bright_addr; |
| 334 | led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1; |
| 335 | led_dat->timer = pdata->timer; |
| 336 | led_dat->num_timer = pdata->num_timer; |
| 337 | |
| 338 | ret = led_classdev_register(&pdev->dev, &led_dat->cdev); |
| 339 | if (ret < 0) |
| 340 | return ret; |
| 341 | |
| 342 | /* |
| 343 | * If available, expose the SATA activity blink capability through |
| 344 | * a "sata" sysfs attribute. |
| 345 | */ |
| 346 | if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) { |
| 347 | ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); |
| 348 | if (ret) |
| 349 | led_classdev_unregister(&led_dat->cdev); |
| 350 | } |
| 351 | |
| 352 | return ret; |
| 353 | } |
| 354 | |
| 355 | static int __devinit netxbig_led_probe(struct platform_device *pdev) |
| 356 | { |
| 357 | struct netxbig_led_platform_data *pdata = pdev->dev.platform_data; |
| 358 | struct netxbig_led_data *leds_data; |
| 359 | int i; |
| 360 | int ret; |
| 361 | |
| 362 | if (!pdata) |
| 363 | return -EINVAL; |
| 364 | |
| 365 | leds_data = kzalloc(sizeof(struct netxbig_led_data) * pdata->num_leds, |
| 366 | GFP_KERNEL); |
| 367 | if (!leds_data) |
| 368 | return -ENOMEM; |
| 369 | |
| 370 | ret = gpio_ext_init(pdata->gpio_ext); |
| 371 | if (ret < 0) |
| 372 | goto err_free_data; |
| 373 | |
| 374 | for (i = 0; i < pdata->num_leds; i++) { |
| 375 | ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]); |
| 376 | if (ret < 0) |
| 377 | goto err_free_leds; |
| 378 | } |
| 379 | |
| 380 | platform_set_drvdata(pdev, leds_data); |
| 381 | |
| 382 | return 0; |
| 383 | |
| 384 | err_free_leds: |
| 385 | for (i = i - 1; i >= 0; i--) |
| 386 | delete_netxbig_led(&leds_data[i]); |
| 387 | |
| 388 | gpio_ext_free(pdata->gpio_ext); |
| 389 | err_free_data: |
| 390 | kfree(leds_data); |
| 391 | |
| 392 | return ret; |
| 393 | } |
| 394 | |
| 395 | static int __devexit netxbig_led_remove(struct platform_device *pdev) |
| 396 | { |
| 397 | struct netxbig_led_platform_data *pdata = pdev->dev.platform_data; |
| 398 | struct netxbig_led_data *leds_data; |
| 399 | int i; |
| 400 | |
| 401 | leds_data = platform_get_drvdata(pdev); |
| 402 | |
| 403 | for (i = 0; i < pdata->num_leds; i++) |
| 404 | delete_netxbig_led(&leds_data[i]); |
| 405 | |
| 406 | gpio_ext_free(pdata->gpio_ext); |
| 407 | kfree(leds_data); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | static struct platform_driver netxbig_led_driver = { |
| 413 | .probe = netxbig_led_probe, |
| 414 | .remove = __devexit_p(netxbig_led_remove), |
| 415 | .driver = { |
| 416 | .name = "leds-netxbig", |
| 417 | .owner = THIS_MODULE, |
| 418 | }, |
| 419 | }; |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 420 | |
Axel Lin | 892a884 | 2012-01-10 15:09:24 -0800 | [diff] [blame] | 421 | module_platform_driver(netxbig_led_driver); |
Simon Guinot | 2446783 | 2010-10-07 16:38:49 +0200 | [diff] [blame] | 422 | |
| 423 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); |
| 424 | MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards"); |
| 425 | MODULE_LICENSE("GPL"); |
Axel Lin | 892a884 | 2012-01-10 15:09:24 -0800 | [diff] [blame] | 426 | MODULE_ALIAS("platform:leds-netxbig"); |