root/drivers/leds/leds-ns2.c

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DEFINITIONS

This source file includes following definitions.
  1. ns2_led_get_mode
  2. ns2_led_set_mode
  3. ns2_led_set
  4. ns2_led_set_blocking
  5. ns2_led_sata_store
  6. ns2_led_sata_show
  7. create_ns2_led
  8. delete_ns2_led
  9. ns2_leds_get_of_pdata
  10. sizeof_ns2_led_priv
  11. ns2_led_probe
  12. ns2_led_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
   4  *
   5  * Copyright (C) 2010 LaCie
   6  *
   7  * Author: Simon Guinot <sguinot@lacie.com>
   8  *
   9  * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
  10  */
  11 
  12 #include <linux/kernel.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15 #include <linux/gpio.h>
  16 #include <linux/leds.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_data/leds-kirkwood-ns2.h>
  19 #include <linux/of.h>
  20 #include <linux/of_gpio.h>
  21 #include "leds.h"
  22 
  23 /*
  24  * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
  25  * modes are available: off, on and SATA activity blinking. The LED modes are
  26  * controlled through two GPIOs (command and slow): each combination of values
  27  * for the command/slow GPIOs corresponds to a LED mode.
  28  */
  29 
  30 struct ns2_led_data {
  31         struct led_classdev     cdev;
  32         unsigned int            cmd;
  33         unsigned int            slow;
  34         bool                    can_sleep;
  35         unsigned char           sata; /* True when SATA mode active. */
  36         rwlock_t                rw_lock; /* Lock GPIOs. */
  37         int                     num_modes;
  38         struct ns2_led_modval   *modval;
  39 };
  40 
  41 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
  42                             enum ns2_led_modes *mode)
  43 {
  44         int i;
  45         int ret = -EINVAL;
  46         int cmd_level;
  47         int slow_level;
  48 
  49         cmd_level = gpio_get_value_cansleep(led_dat->cmd);
  50         slow_level = gpio_get_value_cansleep(led_dat->slow);
  51 
  52         for (i = 0; i < led_dat->num_modes; i++) {
  53                 if (cmd_level == led_dat->modval[i].cmd_level &&
  54                     slow_level == led_dat->modval[i].slow_level) {
  55                         *mode = led_dat->modval[i].mode;
  56                         ret = 0;
  57                         break;
  58                 }
  59         }
  60 
  61         return ret;
  62 }
  63 
  64 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
  65                              enum ns2_led_modes mode)
  66 {
  67         int i;
  68         bool found = false;
  69         unsigned long flags;
  70 
  71         for (i = 0; i < led_dat->num_modes; i++)
  72                 if (mode == led_dat->modval[i].mode) {
  73                         found = true;
  74                         break;
  75                 }
  76 
  77         if (!found)
  78                 return;
  79 
  80         write_lock_irqsave(&led_dat->rw_lock, flags);
  81 
  82         if (!led_dat->can_sleep) {
  83                 gpio_set_value(led_dat->cmd,
  84                                led_dat->modval[i].cmd_level);
  85                 gpio_set_value(led_dat->slow,
  86                                led_dat->modval[i].slow_level);
  87                 goto exit_unlock;
  88         }
  89 
  90         gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
  91         gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
  92 
  93 exit_unlock:
  94         write_unlock_irqrestore(&led_dat->rw_lock, flags);
  95 }
  96 
  97 static void ns2_led_set(struct led_classdev *led_cdev,
  98                         enum led_brightness value)
  99 {
 100         struct ns2_led_data *led_dat =
 101                 container_of(led_cdev, struct ns2_led_data, cdev);
 102         enum ns2_led_modes mode;
 103 
 104         if (value == LED_OFF)
 105                 mode = NS_V2_LED_OFF;
 106         else if (led_dat->sata)
 107                 mode = NS_V2_LED_SATA;
 108         else
 109                 mode = NS_V2_LED_ON;
 110 
 111         ns2_led_set_mode(led_dat, mode);
 112 }
 113 
 114 static int ns2_led_set_blocking(struct led_classdev *led_cdev,
 115                         enum led_brightness value)
 116 {
 117         ns2_led_set(led_cdev, value);
 118         return 0;
 119 }
 120 
 121 static ssize_t ns2_led_sata_store(struct device *dev,
 122                                   struct device_attribute *attr,
 123                                   const char *buff, size_t count)
 124 {
 125         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 126         struct ns2_led_data *led_dat =
 127                 container_of(led_cdev, struct ns2_led_data, cdev);
 128         int ret;
 129         unsigned long enable;
 130 
 131         ret = kstrtoul(buff, 10, &enable);
 132         if (ret < 0)
 133                 return ret;
 134 
 135         enable = !!enable;
 136 
 137         if (led_dat->sata == enable)
 138                 goto exit;
 139 
 140         led_dat->sata = enable;
 141 
 142         if (!led_get_brightness(led_cdev))
 143                 goto exit;
 144 
 145         if (enable)
 146                 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
 147         else
 148                 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
 149 
 150 exit:
 151         return count;
 152 }
 153 
 154 static ssize_t ns2_led_sata_show(struct device *dev,
 155                                  struct device_attribute *attr, char *buf)
 156 {
 157         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 158         struct ns2_led_data *led_dat =
 159                 container_of(led_cdev, struct ns2_led_data, cdev);
 160 
 161         return sprintf(buf, "%d\n", led_dat->sata);
 162 }
 163 
 164 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
 165 
 166 static struct attribute *ns2_led_attrs[] = {
 167         &dev_attr_sata.attr,
 168         NULL
 169 };
 170 ATTRIBUTE_GROUPS(ns2_led);
 171 
 172 static int
 173 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
 174                const struct ns2_led *template)
 175 {
 176         int ret;
 177         enum ns2_led_modes mode;
 178 
 179         ret = devm_gpio_request_one(&pdev->dev, template->cmd,
 180                         gpio_get_value_cansleep(template->cmd) ?
 181                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
 182                         template->name);
 183         if (ret) {
 184                 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
 185                         template->name);
 186                 return ret;
 187         }
 188 
 189         ret = devm_gpio_request_one(&pdev->dev, template->slow,
 190                         gpio_get_value_cansleep(template->slow) ?
 191                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
 192                         template->name);
 193         if (ret) {
 194                 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
 195                         template->name);
 196                 return ret;
 197         }
 198 
 199         rwlock_init(&led_dat->rw_lock);
 200 
 201         led_dat->cdev.name = template->name;
 202         led_dat->cdev.default_trigger = template->default_trigger;
 203         led_dat->cdev.blink_set = NULL;
 204         led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
 205         led_dat->cdev.groups = ns2_led_groups;
 206         led_dat->cmd = template->cmd;
 207         led_dat->slow = template->slow;
 208         led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
 209                                 gpio_cansleep(led_dat->slow);
 210         if (led_dat->can_sleep)
 211                 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
 212         else
 213                 led_dat->cdev.brightness_set = ns2_led_set;
 214         led_dat->modval = template->modval;
 215         led_dat->num_modes = template->num_modes;
 216 
 217         ret = ns2_led_get_mode(led_dat, &mode);
 218         if (ret < 0)
 219                 return ret;
 220 
 221         /* Set LED initial state. */
 222         led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
 223         led_dat->cdev.brightness =
 224                 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
 225 
 226         ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 227         if (ret < 0)
 228                 return ret;
 229 
 230         return 0;
 231 }
 232 
 233 static void delete_ns2_led(struct ns2_led_data *led_dat)
 234 {
 235         led_classdev_unregister(&led_dat->cdev);
 236 }
 237 
 238 #ifdef CONFIG_OF_GPIO
 239 /*
 240  * Translate OpenFirmware node properties into platform_data.
 241  */
 242 static int
 243 ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
 244 {
 245         struct device_node *np = dev->of_node;
 246         struct device_node *child;
 247         struct ns2_led *led, *leds;
 248         int ret, num_leds = 0;
 249 
 250         num_leds = of_get_child_count(np);
 251         if (!num_leds)
 252                 return -ENODEV;
 253 
 254         leds = devm_kcalloc(dev, num_leds, sizeof(struct ns2_led),
 255                             GFP_KERNEL);
 256         if (!leds)
 257                 return -ENOMEM;
 258 
 259         led = leds;
 260         for_each_child_of_node(np, child) {
 261                 const char *string;
 262                 int i, num_modes;
 263                 struct ns2_led_modval *modval;
 264 
 265                 ret = of_get_named_gpio(child, "cmd-gpio", 0);
 266                 if (ret < 0)
 267                         goto err_node_put;
 268                 led->cmd = ret;
 269                 ret = of_get_named_gpio(child, "slow-gpio", 0);
 270                 if (ret < 0)
 271                         goto err_node_put;
 272                 led->slow = ret;
 273                 ret = of_property_read_string(child, "label", &string);
 274                 led->name = (ret == 0) ? string : child->name;
 275                 ret = of_property_read_string(child, "linux,default-trigger",
 276                                               &string);
 277                 if (ret == 0)
 278                         led->default_trigger = string;
 279 
 280                 ret = of_property_count_u32_elems(child, "modes-map");
 281                 if (ret < 0 || ret % 3) {
 282                         dev_err(dev,
 283                                 "Missing or malformed modes-map property\n");
 284                         ret = -EINVAL;
 285                         goto err_node_put;
 286                 }
 287 
 288                 num_modes = ret / 3;
 289                 modval = devm_kcalloc(dev,
 290                                       num_modes,
 291                                       sizeof(struct ns2_led_modval),
 292                                       GFP_KERNEL);
 293                 if (!modval) {
 294                         ret = -ENOMEM;
 295                         goto err_node_put;
 296                 }
 297 
 298                 for (i = 0; i < num_modes; i++) {
 299                         of_property_read_u32_index(child,
 300                                                 "modes-map", 3 * i,
 301                                                 (u32 *) &modval[i].mode);
 302                         of_property_read_u32_index(child,
 303                                                 "modes-map", 3 * i + 1,
 304                                                 (u32 *) &modval[i].cmd_level);
 305                         of_property_read_u32_index(child,
 306                                                 "modes-map", 3 * i + 2,
 307                                                 (u32 *) &modval[i].slow_level);
 308                 }
 309 
 310                 led->num_modes = num_modes;
 311                 led->modval = modval;
 312 
 313                 led++;
 314         }
 315 
 316         pdata->leds = leds;
 317         pdata->num_leds = num_leds;
 318 
 319         return 0;
 320 
 321 err_node_put:
 322         of_node_put(child);
 323         return ret;
 324 }
 325 
 326 static const struct of_device_id of_ns2_leds_match[] = {
 327         { .compatible = "lacie,ns2-leds", },
 328         {},
 329 };
 330 MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
 331 #endif /* CONFIG_OF_GPIO */
 332 
 333 struct ns2_led_priv {
 334         int num_leds;
 335         struct ns2_led_data leds_data[];
 336 };
 337 
 338 static inline int sizeof_ns2_led_priv(int num_leds)
 339 {
 340         return sizeof(struct ns2_led_priv) +
 341                       (sizeof(struct ns2_led_data) * num_leds);
 342 }
 343 
 344 static int ns2_led_probe(struct platform_device *pdev)
 345 {
 346         struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
 347         struct ns2_led_priv *priv;
 348         int i;
 349         int ret;
 350 
 351 #ifdef CONFIG_OF_GPIO
 352         if (!pdata) {
 353                 pdata = devm_kzalloc(&pdev->dev,
 354                                      sizeof(struct ns2_led_platform_data),
 355                                      GFP_KERNEL);
 356                 if (!pdata)
 357                         return -ENOMEM;
 358 
 359                 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
 360                 if (ret)
 361                         return ret;
 362         }
 363 #else
 364         if (!pdata)
 365                 return -EINVAL;
 366 #endif /* CONFIG_OF_GPIO */
 367 
 368         priv = devm_kzalloc(&pdev->dev,
 369                             sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
 370         if (!priv)
 371                 return -ENOMEM;
 372         priv->num_leds = pdata->num_leds;
 373 
 374         for (i = 0; i < priv->num_leds; i++) {
 375                 ret = create_ns2_led(pdev, &priv->leds_data[i],
 376                                      &pdata->leds[i]);
 377                 if (ret < 0) {
 378                         for (i = i - 1; i >= 0; i--)
 379                                 delete_ns2_led(&priv->leds_data[i]);
 380                         return ret;
 381                 }
 382         }
 383 
 384         platform_set_drvdata(pdev, priv);
 385 
 386         return 0;
 387 }
 388 
 389 static int ns2_led_remove(struct platform_device *pdev)
 390 {
 391         int i;
 392         struct ns2_led_priv *priv;
 393 
 394         priv = platform_get_drvdata(pdev);
 395 
 396         for (i = 0; i < priv->num_leds; i++)
 397                 delete_ns2_led(&priv->leds_data[i]);
 398 
 399         return 0;
 400 }
 401 
 402 static struct platform_driver ns2_led_driver = {
 403         .probe          = ns2_led_probe,
 404         .remove         = ns2_led_remove,
 405         .driver         = {
 406                 .name           = "leds-ns2",
 407                 .of_match_table = of_match_ptr(of_ns2_leds_match),
 408         },
 409 };
 410 
 411 module_platform_driver(ns2_led_driver);
 412 
 413 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
 414 MODULE_DESCRIPTION("Network Space v2 LED driver");
 415 MODULE_LICENSE("GPL");
 416 MODULE_ALIAS("platform:leds-ns2");

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