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11efe71f SG |
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> | |
54f4dedb | 31 | #include <linux/module.h> |
c02cecb9 | 32 | #include <linux/platform_data/leds-kirkwood-ns2.h> |
c68f46dd | 33 | #include <linux/of.h> |
72052fcc | 34 | #include <linux/of_gpio.h> |
11efe71f SG |
35 | |
36 | /* | |
37 | * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in | |
38 | * relation with the SATA activity. This capability is exposed through the | |
39 | * "sata" sysfs attribute. | |
40 | * | |
41 | * The following array detail the different LED registers and the combination | |
42 | * of their possible values: | |
43 | * | |
44 | * cmd_led | slow_led | /SATA active | LED state | |
45 | * | | | | |
46 | * 1 | 0 | x | off | |
47 | * - | 1 | x | on | |
48 | * 0 | 0 | 1 | on | |
49 | * 0 | 0 | 0 | blink (rate 300ms) | |
50 | */ | |
51 | ||
52 | enum ns2_led_modes { | |
53 | NS_V2_LED_OFF, | |
54 | NS_V2_LED_ON, | |
55 | NS_V2_LED_SATA, | |
56 | }; | |
57 | ||
58 | struct ns2_led_mode_value { | |
59 | enum ns2_led_modes mode; | |
60 | int cmd_level; | |
61 | int slow_level; | |
62 | }; | |
63 | ||
64 | static struct ns2_led_mode_value ns2_led_modval[] = { | |
65 | { NS_V2_LED_OFF , 1, 0 }, | |
66 | { NS_V2_LED_ON , 0, 1 }, | |
67 | { NS_V2_LED_ON , 1, 1 }, | |
68 | { NS_V2_LED_SATA, 0, 0 }, | |
69 | }; | |
70 | ||
71 | struct ns2_led_data { | |
72 | struct led_classdev cdev; | |
73 | unsigned cmd; | |
74 | unsigned slow; | |
75 | unsigned char sata; /* True when SATA mode active. */ | |
76 | rwlock_t rw_lock; /* Lock GPIOs. */ | |
77 | }; | |
78 | ||
79 | static int ns2_led_get_mode(struct ns2_led_data *led_dat, | |
80 | enum ns2_led_modes *mode) | |
81 | { | |
82 | int i; | |
83 | int ret = -EINVAL; | |
84 | int cmd_level; | |
85 | int slow_level; | |
86 | ||
f539dfed | 87 | read_lock_irq(&led_dat->rw_lock); |
11efe71f SG |
88 | |
89 | cmd_level = gpio_get_value(led_dat->cmd); | |
90 | slow_level = gpio_get_value(led_dat->slow); | |
91 | ||
92 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { | |
93 | if (cmd_level == ns2_led_modval[i].cmd_level && | |
94 | slow_level == ns2_led_modval[i].slow_level) { | |
95 | *mode = ns2_led_modval[i].mode; | |
96 | ret = 0; | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
f539dfed | 101 | read_unlock_irq(&led_dat->rw_lock); |
11efe71f SG |
102 | |
103 | return ret; | |
104 | } | |
105 | ||
106 | static void ns2_led_set_mode(struct ns2_led_data *led_dat, | |
107 | enum ns2_led_modes mode) | |
108 | { | |
109 | int i; | |
f539dfed | 110 | unsigned long flags; |
11efe71f | 111 | |
f539dfed | 112 | write_lock_irqsave(&led_dat->rw_lock, flags); |
11efe71f SG |
113 | |
114 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { | |
115 | if (mode == ns2_led_modval[i].mode) { | |
116 | gpio_set_value(led_dat->cmd, | |
117 | ns2_led_modval[i].cmd_level); | |
118 | gpio_set_value(led_dat->slow, | |
119 | ns2_led_modval[i].slow_level); | |
120 | } | |
121 | } | |
122 | ||
f539dfed | 123 | write_unlock_irqrestore(&led_dat->rw_lock, flags); |
11efe71f SG |
124 | } |
125 | ||
126 | static void ns2_led_set(struct led_classdev *led_cdev, | |
127 | enum led_brightness value) | |
128 | { | |
129 | struct ns2_led_data *led_dat = | |
130 | container_of(led_cdev, struct ns2_led_data, cdev); | |
131 | enum ns2_led_modes mode; | |
132 | ||
133 | if (value == LED_OFF) | |
134 | mode = NS_V2_LED_OFF; | |
135 | else if (led_dat->sata) | |
136 | mode = NS_V2_LED_SATA; | |
137 | else | |
138 | mode = NS_V2_LED_ON; | |
139 | ||
140 | ns2_led_set_mode(led_dat, mode); | |
141 | } | |
142 | ||
143 | static ssize_t ns2_led_sata_store(struct device *dev, | |
144 | struct device_attribute *attr, | |
145 | const char *buff, size_t count) | |
146 | { | |
e5971bbc SG |
147 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
148 | struct ns2_led_data *led_dat = | |
149 | container_of(led_cdev, struct ns2_led_data, cdev); | |
11efe71f SG |
150 | int ret; |
151 | unsigned long enable; | |
152 | enum ns2_led_modes mode; | |
11efe71f | 153 | |
3874350c | 154 | ret = kstrtoul(buff, 10, &enable); |
11efe71f SG |
155 | if (ret < 0) |
156 | return ret; | |
157 | ||
158 | enable = !!enable; | |
159 | ||
160 | if (led_dat->sata == enable) | |
161 | return count; | |
162 | ||
163 | ret = ns2_led_get_mode(led_dat, &mode); | |
164 | if (ret < 0) | |
165 | return ret; | |
166 | ||
167 | if (enable && mode == NS_V2_LED_ON) | |
168 | ns2_led_set_mode(led_dat, NS_V2_LED_SATA); | |
169 | if (!enable && mode == NS_V2_LED_SATA) | |
170 | ns2_led_set_mode(led_dat, NS_V2_LED_ON); | |
171 | ||
172 | led_dat->sata = enable; | |
173 | ||
174 | return count; | |
175 | } | |
176 | ||
177 | static ssize_t ns2_led_sata_show(struct device *dev, | |
178 | struct device_attribute *attr, char *buf) | |
179 | { | |
e5971bbc SG |
180 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
181 | struct ns2_led_data *led_dat = | |
182 | container_of(led_cdev, struct ns2_led_data, cdev); | |
11efe71f SG |
183 | |
184 | return sprintf(buf, "%d\n", led_dat->sata); | |
185 | } | |
186 | ||
187 | static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store); | |
188 | ||
98ea1ea2 | 189 | static int |
11efe71f SG |
190 | create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat, |
191 | const struct ns2_led *template) | |
192 | { | |
193 | int ret; | |
194 | enum ns2_led_modes mode; | |
195 | ||
04195823 | 196 | ret = devm_gpio_request_one(&pdev->dev, template->cmd, |
9d04cbaa JH |
197 | gpio_get_value(template->cmd) ? |
198 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW, | |
31c3dc74 | 199 | template->name); |
11efe71f SG |
200 | if (ret) { |
201 | dev_err(&pdev->dev, "%s: failed to setup command GPIO\n", | |
202 | template->name); | |
31c3dc74 | 203 | return ret; |
11efe71f SG |
204 | } |
205 | ||
04195823 | 206 | ret = devm_gpio_request_one(&pdev->dev, template->slow, |
9d04cbaa JH |
207 | gpio_get_value(template->slow) ? |
208 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW, | |
31c3dc74 | 209 | template->name); |
11efe71f SG |
210 | if (ret) { |
211 | dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n", | |
212 | template->name); | |
04195823 | 213 | return ret; |
11efe71f SG |
214 | } |
215 | ||
216 | rwlock_init(&led_dat->rw_lock); | |
217 | ||
218 | led_dat->cdev.name = template->name; | |
219 | led_dat->cdev.default_trigger = template->default_trigger; | |
220 | led_dat->cdev.blink_set = NULL; | |
221 | led_dat->cdev.brightness_set = ns2_led_set; | |
222 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
223 | led_dat->cmd = template->cmd; | |
224 | led_dat->slow = template->slow; | |
225 | ||
226 | ret = ns2_led_get_mode(led_dat, &mode); | |
227 | if (ret < 0) | |
04195823 | 228 | return ret; |
11efe71f SG |
229 | |
230 | /* Set LED initial state. */ | |
231 | led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0; | |
232 | led_dat->cdev.brightness = | |
233 | (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL; | |
234 | ||
235 | ret = led_classdev_register(&pdev->dev, &led_dat->cdev); | |
236 | if (ret < 0) | |
04195823 | 237 | return ret; |
11efe71f | 238 | |
11efe71f SG |
239 | ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); |
240 | if (ret < 0) | |
241 | goto err_free_cdev; | |
242 | ||
243 | return 0; | |
244 | ||
245 | err_free_cdev: | |
246 | led_classdev_unregister(&led_dat->cdev); | |
11efe71f SG |
247 | return ret; |
248 | } | |
249 | ||
b8cd742a | 250 | static void delete_ns2_led(struct ns2_led_data *led_dat) |
11efe71f SG |
251 | { |
252 | device_remove_file(led_dat->cdev.dev, &dev_attr_sata); | |
253 | led_classdev_unregister(&led_dat->cdev); | |
11efe71f SG |
254 | } |
255 | ||
72052fcc SG |
256 | #ifdef CONFIG_OF_GPIO |
257 | /* | |
258 | * Translate OpenFirmware node properties into platform_data. | |
259 | */ | |
cf4af012 | 260 | static int |
72052fcc SG |
261 | ns2_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 *leds; | |
266 | int num_leds = 0; | |
267 | int i = 0; | |
268 | ||
269 | num_leds = of_get_child_count(np); | |
270 | if (!num_leds) | |
271 | return -ENODEV; | |
272 | ||
273 | leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led), | |
274 | GFP_KERNEL); | |
275 | if (!leds) | |
276 | return -ENOMEM; | |
277 | ||
278 | for_each_child_of_node(np, child) { | |
279 | const char *string; | |
280 | int ret; | |
281 | ||
282 | ret = of_get_named_gpio(child, "cmd-gpio", 0); | |
283 | if (ret < 0) | |
284 | return ret; | |
285 | leds[i].cmd = ret; | |
286 | ret = of_get_named_gpio(child, "slow-gpio", 0); | |
287 | if (ret < 0) | |
288 | return ret; | |
289 | leds[i].slow = ret; | |
290 | ret = of_property_read_string(child, "label", &string); | |
291 | leds[i].name = (ret == 0) ? string : child->name; | |
292 | ret = of_property_read_string(child, "linux,default-trigger", | |
293 | &string); | |
294 | if (ret == 0) | |
295 | leds[i].default_trigger = string; | |
296 | ||
297 | i++; | |
298 | } | |
299 | ||
300 | pdata->leds = leds; | |
301 | pdata->num_leds = num_leds; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static const struct of_device_id of_ns2_leds_match[] = { | |
307 | { .compatible = "lacie,ns2-leds", }, | |
308 | {}, | |
309 | }; | |
310 | #endif /* CONFIG_OF_GPIO */ | |
311 | ||
3de1929b SG |
312 | struct ns2_led_priv { |
313 | int num_leds; | |
314 | struct ns2_led_data leds_data[]; | |
315 | }; | |
316 | ||
317 | static inline int sizeof_ns2_led_priv(int num_leds) | |
318 | { | |
319 | return sizeof(struct ns2_led_priv) + | |
320 | (sizeof(struct ns2_led_data) * num_leds); | |
321 | } | |
322 | ||
98ea1ea2 | 323 | static int ns2_led_probe(struct platform_device *pdev) |
11efe71f | 324 | { |
87aae1ea | 325 | struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
3de1929b | 326 | struct ns2_led_priv *priv; |
11efe71f SG |
327 | int i; |
328 | int ret; | |
329 | ||
72052fcc SG |
330 | #ifdef CONFIG_OF_GPIO |
331 | if (!pdata) { | |
332 | pdata = devm_kzalloc(&pdev->dev, | |
333 | sizeof(struct ns2_led_platform_data), | |
334 | GFP_KERNEL); | |
335 | if (!pdata) | |
336 | return -ENOMEM; | |
337 | ||
338 | ret = ns2_leds_get_of_pdata(&pdev->dev, pdata); | |
339 | if (ret) | |
340 | return ret; | |
341 | } | |
342 | #else | |
11efe71f SG |
343 | if (!pdata) |
344 | return -EINVAL; | |
72052fcc | 345 | #endif /* CONFIG_OF_GPIO */ |
11efe71f | 346 | |
3de1929b SG |
347 | priv = devm_kzalloc(&pdev->dev, |
348 | sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL); | |
349 | if (!priv) | |
11efe71f | 350 | return -ENOMEM; |
3de1929b | 351 | priv->num_leds = pdata->num_leds; |
11efe71f | 352 | |
3de1929b SG |
353 | for (i = 0; i < priv->num_leds; i++) { |
354 | ret = create_ns2_led(pdev, &priv->leds_data[i], | |
355 | &pdata->leds[i]); | |
a209f766 BW |
356 | if (ret < 0) { |
357 | for (i = i - 1; i >= 0; i--) | |
3de1929b | 358 | delete_ns2_led(&priv->leds_data[i]); |
a209f766 BW |
359 | return ret; |
360 | } | |
11efe71f SG |
361 | } |
362 | ||
3de1929b | 363 | platform_set_drvdata(pdev, priv); |
11efe71f SG |
364 | |
365 | return 0; | |
11efe71f SG |
366 | } |
367 | ||
678e8a6b | 368 | static int ns2_led_remove(struct platform_device *pdev) |
11efe71f SG |
369 | { |
370 | int i; | |
3de1929b | 371 | struct ns2_led_priv *priv; |
11efe71f | 372 | |
3de1929b | 373 | priv = platform_get_drvdata(pdev); |
11efe71f | 374 | |
3de1929b SG |
375 | for (i = 0; i < priv->num_leds; i++) |
376 | delete_ns2_led(&priv->leds_data[i]); | |
11efe71f | 377 | |
11efe71f SG |
378 | return 0; |
379 | } | |
380 | ||
381 | static struct platform_driver ns2_led_driver = { | |
382 | .probe = ns2_led_probe, | |
df07cf81 | 383 | .remove = ns2_led_remove, |
11efe71f | 384 | .driver = { |
72052fcc SG |
385 | .name = "leds-ns2", |
386 | .owner = THIS_MODULE, | |
387 | .of_match_table = of_match_ptr(of_ns2_leds_match), | |
11efe71f SG |
388 | }, |
389 | }; | |
11efe71f | 390 | |
892a8843 | 391 | module_platform_driver(ns2_led_driver); |
11efe71f SG |
392 | |
393 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
394 | MODULE_DESCRIPTION("Network Space v2 LED driver"); | |
395 | MODULE_LICENSE("GPL"); | |
892a8843 | 396 | MODULE_ALIAS("platform:leds-ns2"); |