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25#include <linux/kernel.h>
26#include <linux/platform_device.h>
27#include <linux/slab.h>
28#include <linux/gpio.h>
29#include <linux/leds.h>
30#include <linux/module.h>
31#include <linux/platform_data/leds-kirkwood-ns2.h>
32#include <linux/of.h>
33#include <linux/of_gpio.h>
34#include "leds.h"
35
36
37
38
39
40
41
42
43struct ns2_led_data {
44 struct led_classdev cdev;
45 unsigned cmd;
46 unsigned slow;
47 bool can_sleep;
48 int mode_index;
49 unsigned char sata;
50 rwlock_t rw_lock;
51 struct work_struct work;
52 int num_modes;
53 struct ns2_led_modval *modval;
54};
55
56static void ns2_led_work(struct work_struct *work)
57{
58 struct ns2_led_data *led_dat =
59 container_of(work, struct ns2_led_data, work);
60 int i = led_dat->mode_index;
61
62 gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
63 gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
64}
65
66static int ns2_led_get_mode(struct ns2_led_data *led_dat,
67 enum ns2_led_modes *mode)
68{
69 int i;
70 int ret = -EINVAL;
71 int cmd_level;
72 int slow_level;
73
74 cmd_level = gpio_get_value_cansleep(led_dat->cmd);
75 slow_level = gpio_get_value_cansleep(led_dat->slow);
76
77 for (i = 0; i < led_dat->num_modes; i++) {
78 if (cmd_level == led_dat->modval[i].cmd_level &&
79 slow_level == led_dat->modval[i].slow_level) {
80 *mode = led_dat->modval[i].mode;
81 ret = 0;
82 break;
83 }
84 }
85
86 return ret;
87}
88
89static void ns2_led_set_mode(struct ns2_led_data *led_dat,
90 enum ns2_led_modes mode)
91{
92 int i;
93 bool found = false;
94 unsigned long flags;
95
96 for (i = 0; i < led_dat->num_modes; i++)
97 if (mode == led_dat->modval[i].mode) {
98 found = true;
99 break;
100 }
101
102 if (!found)
103 return;
104
105 write_lock_irqsave(&led_dat->rw_lock, flags);
106
107 if (!led_dat->can_sleep) {
108 gpio_set_value(led_dat->cmd,
109 led_dat->modval[i].cmd_level);
110 gpio_set_value(led_dat->slow,
111 led_dat->modval[i].slow_level);
112 goto exit_unlock;
113 }
114
115 led_dat->mode_index = i;
116 schedule_work(&led_dat->work);
117
118exit_unlock:
119 write_unlock_irqrestore(&led_dat->rw_lock, flags);
120}
121
122static 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
139static ssize_t ns2_led_sata_store(struct device *dev,
140 struct device_attribute *attr,
141 const char *buff, size_t count)
142{
143 struct led_classdev *led_cdev = dev_get_drvdata(dev);
144 struct ns2_led_data *led_dat =
145 container_of(led_cdev, struct ns2_led_data, cdev);
146 int ret;
147 unsigned long enable;
148
149 ret = kstrtoul(buff, 10, &enable);
150 if (ret < 0)
151 return ret;
152
153 enable = !!enable;
154
155 if (led_dat->sata == enable)
156 goto exit;
157
158 led_dat->sata = enable;
159
160 if (!led_get_brightness(led_cdev))
161 goto exit;
162
163 if (enable)
164 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
165 else
166 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
167
168exit:
169 return count;
170}
171
172static ssize_t ns2_led_sata_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174{
175 struct led_classdev *led_cdev = dev_get_drvdata(dev);
176 struct ns2_led_data *led_dat =
177 container_of(led_cdev, struct ns2_led_data, cdev);
178
179 return sprintf(buf, "%d\n", led_dat->sata);
180}
181
182static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
183
184static struct attribute *ns2_led_attrs[] = {
185 &dev_attr_sata.attr,
186 NULL
187};
188ATTRIBUTE_GROUPS(ns2_led);
189
190static int
191create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
192 const struct ns2_led *template)
193{
194 int ret;
195 enum ns2_led_modes mode;
196
197 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
198 gpio_get_value_cansleep(template->cmd) ?
199 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
200 template->name);
201 if (ret) {
202 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
203 template->name);
204 return ret;
205 }
206
207 ret = devm_gpio_request_one(&pdev->dev, template->slow,
208 gpio_get_value_cansleep(template->slow) ?
209 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
210 template->name);
211 if (ret) {
212 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
213 template->name);
214 return ret;
215 }
216
217 rwlock_init(&led_dat->rw_lock);
218
219 led_dat->cdev.name = template->name;
220 led_dat->cdev.default_trigger = template->default_trigger;
221 led_dat->cdev.blink_set = NULL;
222 led_dat->cdev.brightness_set = ns2_led_set;
223 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
224 led_dat->cdev.groups = ns2_led_groups;
225 led_dat->cmd = template->cmd;
226 led_dat->slow = template->slow;
227 led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
228 gpio_cansleep(led_dat->slow);
229 led_dat->modval = template->modval;
230 led_dat->num_modes = template->num_modes;
231
232 ret = ns2_led_get_mode(led_dat, &mode);
233 if (ret < 0)
234 return ret;
235
236
237 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
238 led_dat->cdev.brightness =
239 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
240
241 INIT_WORK(&led_dat->work, ns2_led_work);
242
243 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
244 if (ret < 0)
245 return ret;
246
247 return 0;
248}
249
250static void delete_ns2_led(struct ns2_led_data *led_dat)
251{
252 led_classdev_unregister(&led_dat->cdev);
253 cancel_work_sync(&led_dat->work);
254}
255
256#ifdef CONFIG_OF_GPIO
257
258
259
260static int
261ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
262{
263 struct device_node *np = dev->of_node;
264 struct device_node *child;
265 struct ns2_led *led, *leds;
266 int num_leds = 0;
267
268 num_leds = of_get_child_count(np);
269 if (!num_leds)
270 return -ENODEV;
271
272 leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
273 GFP_KERNEL);
274 if (!leds)
275 return -ENOMEM;
276
277 led = leds;
278 for_each_child_of_node(np, child) {
279 const char *string;
280 int ret, i, num_modes;
281 struct ns2_led_modval *modval;
282
283 ret = of_get_named_gpio(child, "cmd-gpio", 0);
284 if (ret < 0)
285 return ret;
286 led->cmd = ret;
287 ret = of_get_named_gpio(child, "slow-gpio", 0);
288 if (ret < 0)
289 return ret;
290 led->slow = ret;
291 ret = of_property_read_string(child, "label", &string);
292 led->name = (ret == 0) ? string : child->name;
293 ret = of_property_read_string(child, "linux,default-trigger",
294 &string);
295 if (ret == 0)
296 led->default_trigger = string;
297
298 ret = of_property_count_u32_elems(child, "modes-map");
299 if (ret < 0 || ret % 3) {
300 dev_err(dev,
301 "Missing or malformed modes-map property\n");
302 return -EINVAL;
303 }
304
305 num_modes = ret / 3;
306 modval = devm_kzalloc(dev,
307 num_modes * sizeof(struct ns2_led_modval),
308 GFP_KERNEL);
309 if (!modval)
310 return -ENOMEM;
311
312 for (i = 0; i < num_modes; i++) {
313 of_property_read_u32_index(child,
314 "modes-map", 3 * i,
315 (u32 *) &modval[i].mode);
316 of_property_read_u32_index(child,
317 "modes-map", 3 * i + 1,
318 (u32 *) &modval[i].cmd_level);
319 of_property_read_u32_index(child,
320 "modes-map", 3 * i + 2,
321 (u32 *) &modval[i].slow_level);
322 }
323
324 led->num_modes = num_modes;
325 led->modval = modval;
326
327 led++;
328 }
329
330 pdata->leds = leds;
331 pdata->num_leds = num_leds;
332
333 return 0;
334}
335
336static const struct of_device_id of_ns2_leds_match[] = {
337 { .compatible = "lacie,ns2-leds", },
338 {},
339};
340MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
341#endif
342
343struct ns2_led_priv {
344 int num_leds;
345 struct ns2_led_data leds_data[];
346};
347
348static inline int sizeof_ns2_led_priv(int num_leds)
349{
350 return sizeof(struct ns2_led_priv) +
351 (sizeof(struct ns2_led_data) * num_leds);
352}
353
354static int ns2_led_probe(struct platform_device *pdev)
355{
356 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
357 struct ns2_led_priv *priv;
358 int i;
359 int ret;
360
361#ifdef CONFIG_OF_GPIO
362 if (!pdata) {
363 pdata = devm_kzalloc(&pdev->dev,
364 sizeof(struct ns2_led_platform_data),
365 GFP_KERNEL);
366 if (!pdata)
367 return -ENOMEM;
368
369 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
370 if (ret)
371 return ret;
372 }
373#else
374 if (!pdata)
375 return -EINVAL;
376#endif
377
378 priv = devm_kzalloc(&pdev->dev,
379 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
380 if (!priv)
381 return -ENOMEM;
382 priv->num_leds = pdata->num_leds;
383
384 for (i = 0; i < priv->num_leds; i++) {
385 ret = create_ns2_led(pdev, &priv->leds_data[i],
386 &pdata->leds[i]);
387 if (ret < 0) {
388 for (i = i - 1; i >= 0; i--)
389 delete_ns2_led(&priv->leds_data[i]);
390 return ret;
391 }
392 }
393
394 platform_set_drvdata(pdev, priv);
395
396 return 0;
397}
398
399static int ns2_led_remove(struct platform_device *pdev)
400{
401 int i;
402 struct ns2_led_priv *priv;
403
404 priv = platform_get_drvdata(pdev);
405
406 for (i = 0; i < priv->num_leds; i++)
407 delete_ns2_led(&priv->leds_data[i]);
408
409 return 0;
410}
411
412static struct platform_driver ns2_led_driver = {
413 .probe = ns2_led_probe,
414 .remove = ns2_led_remove,
415 .driver = {
416 .name = "leds-ns2",
417 .of_match_table = of_match_ptr(of_ns2_leds_match),
418 },
419};
420
421module_platform_driver(ns2_led_driver);
422
423MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
424MODULE_DESCRIPTION("Network Space v2 LED driver");
425MODULE_LICENSE("GPL");
426MODULE_ALIAS("platform:leds-ns2");
427
