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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 <linux/module.h> |
32 | #include <linux/platform_data/leds-kirkwood-ns2.h> |
33 | #include <linux/of_gpio.h> |
34 | |
35 | /* |
36 | * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in |
37 | * relation with the SATA activity. This capability is exposed through the |
38 | * "sata" sysfs attribute. |
39 | * |
40 | * The following array detail the different LED registers and the combination |
41 | * of their possible values: |
42 | * |
43 | * cmd_led | slow_led | /SATA active | LED state |
44 | * | | | |
45 | * 1 | 0 | x | off |
46 | * - | 1 | x | on |
47 | * 0 | 0 | 1 | on |
48 | * 0 | 0 | 0 | blink (rate 300ms) |
49 | */ |
50 | |
51 | enum ns2_led_modes { |
52 | NS_V2_LED_OFF, |
53 | NS_V2_LED_ON, |
54 | NS_V2_LED_SATA, |
55 | }; |
56 | |
57 | struct ns2_led_mode_value { |
58 | enum ns2_led_modes mode; |
59 | int cmd_level; |
60 | int slow_level; |
61 | }; |
62 | |
63 | static struct ns2_led_mode_value ns2_led_modval[] = { |
64 | { NS_V2_LED_OFF , 1, 0 }, |
65 | { NS_V2_LED_ON , 0, 1 }, |
66 | { NS_V2_LED_ON , 1, 1 }, |
67 | { NS_V2_LED_SATA, 0, 0 }, |
68 | }; |
69 | |
70 | struct ns2_led_data { |
71 | struct led_classdev cdev; |
72 | unsigned cmd; |
73 | unsigned slow; |
74 | unsigned char sata; /* True when SATA mode active. */ |
75 | rwlock_t rw_lock; /* Lock GPIOs. */ |
76 | }; |
77 | |
78 | static int ns2_led_get_mode(struct ns2_led_data *led_dat, |
79 | enum ns2_led_modes *mode) |
80 | { |
81 | int i; |
82 | int ret = -EINVAL; |
83 | int cmd_level; |
84 | int slow_level; |
85 | |
86 | read_lock_irq(&led_dat->rw_lock); |
87 | |
88 | cmd_level = gpio_get_value(led_dat->cmd); |
89 | slow_level = gpio_get_value(led_dat->slow); |
90 | |
91 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { |
92 | if (cmd_level == ns2_led_modval[i].cmd_level && |
93 | slow_level == ns2_led_modval[i].slow_level) { |
94 | *mode = ns2_led_modval[i].mode; |
95 | ret = 0; |
96 | break; |
97 | } |
98 | } |
99 | |
100 | read_unlock_irq(&led_dat->rw_lock); |
101 | |
102 | return ret; |
103 | } |
104 | |
105 | static void ns2_led_set_mode(struct ns2_led_data *led_dat, |
106 | enum ns2_led_modes mode) |
107 | { |
108 | int i; |
109 | unsigned long flags; |
110 | |
111 | write_lock_irqsave(&led_dat->rw_lock, flags); |
112 | |
113 | for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { |
114 | if (mode == ns2_led_modval[i].mode) { |
115 | gpio_set_value(led_dat->cmd, |
116 | ns2_led_modval[i].cmd_level); |
117 | gpio_set_value(led_dat->slow, |
118 | ns2_led_modval[i].slow_level); |
119 | } |
120 | } |
121 | |
122 | write_unlock_irqrestore(&led_dat->rw_lock, flags); |
123 | } |
124 | |
125 | static void ns2_led_set(struct led_classdev *led_cdev, |
126 | enum led_brightness value) |
127 | { |
128 | struct ns2_led_data *led_dat = |
129 | container_of(led_cdev, struct ns2_led_data, cdev); |
130 | enum ns2_led_modes mode; |
131 | |
132 | if (value == LED_OFF) |
133 | mode = NS_V2_LED_OFF; |
134 | else if (led_dat->sata) |
135 | mode = NS_V2_LED_SATA; |
136 | else |
137 | mode = NS_V2_LED_ON; |
138 | |
139 | ns2_led_set_mode(led_dat, mode); |
140 | } |
141 | |
142 | static ssize_t ns2_led_sata_store(struct device *dev, |
143 | struct device_attribute *attr, |
144 | const char *buff, size_t count) |
145 | { |
146 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
147 | struct ns2_led_data *led_dat = |
148 | container_of(led_cdev, struct ns2_led_data, cdev); |
149 | int ret; |
150 | unsigned long enable; |
151 | enum ns2_led_modes mode; |
152 | |
153 | ret = kstrtoul(buff, 10, &enable); |
154 | if (ret < 0) |
155 | return ret; |
156 | |
157 | enable = !!enable; |
158 | |
159 | if (led_dat->sata == enable) |
160 | return count; |
161 | |
162 | ret = ns2_led_get_mode(led_dat, &mode); |
163 | if (ret < 0) |
164 | return ret; |
165 | |
166 | if (enable && mode == NS_V2_LED_ON) |
167 | ns2_led_set_mode(led_dat, NS_V2_LED_SATA); |
168 | if (!enable && mode == NS_V2_LED_SATA) |
169 | ns2_led_set_mode(led_dat, NS_V2_LED_ON); |
170 | |
171 | led_dat->sata = enable; |
172 | |
173 | return count; |
174 | } |
175 | |
176 | static ssize_t ns2_led_sata_show(struct device *dev, |
177 | struct device_attribute *attr, char *buf) |
178 | { |
179 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
180 | struct ns2_led_data *led_dat = |
181 | container_of(led_cdev, struct ns2_led_data, cdev); |
182 | |
183 | return sprintf(buf, "%d\n", led_dat->sata); |
184 | } |
185 | |
186 | static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store); |
187 | |
188 | static int |
189 | create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat, |
190 | const struct ns2_led *template) |
191 | { |
192 | int ret; |
193 | enum ns2_led_modes mode; |
194 | |
195 | ret = devm_gpio_request_one(&pdev->dev, template->cmd, |
196 | GPIOF_DIR_OUT | gpio_get_value(template->cmd), |
197 | template->name); |
198 | if (ret) { |
199 | dev_err(&pdev->dev, "%s: failed to setup command GPIO\n", |
200 | template->name); |
201 | return ret; |
202 | } |
203 | |
204 | ret = devm_gpio_request_one(&pdev->dev, template->slow, |
205 | GPIOF_DIR_OUT | gpio_get_value(template->slow), |
206 | template->name); |
207 | if (ret) { |
208 | dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n", |
209 | template->name); |
210 | return ret; |
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 | return ret; |
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 | return ret; |
235 | |
236 | ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); |
237 | if (ret < 0) |
238 | goto err_free_cdev; |
239 | |
240 | return 0; |
241 | |
242 | err_free_cdev: |
243 | led_classdev_unregister(&led_dat->cdev); |
244 | return ret; |
245 | } |
246 | |
247 | static void delete_ns2_led(struct ns2_led_data *led_dat) |
248 | { |
249 | device_remove_file(led_dat->cdev.dev, &dev_attr_sata); |
250 | led_classdev_unregister(&led_dat->cdev); |
251 | } |
252 | |
253 | #ifdef CONFIG_OF_GPIO |
254 | /* |
255 | * Translate OpenFirmware node properties into platform_data. |
256 | */ |
257 | static int |
258 | ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata) |
259 | { |
260 | struct device_node *np = dev->of_node; |
261 | struct device_node *child; |
262 | struct ns2_led *leds; |
263 | int num_leds = 0; |
264 | int i = 0; |
265 | |
266 | num_leds = of_get_child_count(np); |
267 | if (!num_leds) |
268 | return -ENODEV; |
269 | |
270 | leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led), |
271 | GFP_KERNEL); |
272 | if (!leds) |
273 | return -ENOMEM; |
274 | |
275 | for_each_child_of_node(np, child) { |
276 | const char *string; |
277 | int ret; |
278 | |
279 | ret = of_get_named_gpio(child, "cmd-gpio", 0); |
280 | if (ret < 0) |
281 | return ret; |
282 | leds[i].cmd = ret; |
283 | ret = of_get_named_gpio(child, "slow-gpio", 0); |
284 | if (ret < 0) |
285 | return ret; |
286 | leds[i].slow = ret; |
287 | ret = of_property_read_string(child, "label", &string); |
288 | leds[i].name = (ret == 0) ? string : child->name; |
289 | ret = of_property_read_string(child, "linux,default-trigger", |
290 | &string); |
291 | if (ret == 0) |
292 | leds[i].default_trigger = string; |
293 | |
294 | i++; |
295 | } |
296 | |
297 | pdata->leds = leds; |
298 | pdata->num_leds = num_leds; |
299 | |
300 | return 0; |
301 | } |
302 | |
303 | static const struct of_device_id of_ns2_leds_match[] = { |
304 | { .compatible = "lacie,ns2-leds", }, |
305 | {}, |
306 | }; |
307 | #endif /* CONFIG_OF_GPIO */ |
308 | |
309 | static int ns2_led_probe(struct platform_device *pdev) |
310 | { |
311 | struct ns2_led_platform_data *pdata = pdev->dev.platform_data; |
312 | struct ns2_led_data *leds_data; |
313 | int i; |
314 | int ret; |
315 | |
316 | #ifdef CONFIG_OF_GPIO |
317 | if (!pdata) { |
318 | pdata = devm_kzalloc(&pdev->dev, |
319 | sizeof(struct ns2_led_platform_data), |
320 | GFP_KERNEL); |
321 | if (!pdata) |
322 | return -ENOMEM; |
323 | |
324 | ret = ns2_leds_get_of_pdata(&pdev->dev, pdata); |
325 | if (ret) |
326 | return ret; |
327 | } |
328 | #else |
329 | if (!pdata) |
330 | return -EINVAL; |
331 | #endif /* CONFIG_OF_GPIO */ |
332 | |
333 | leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) * |
334 | pdata->num_leds, GFP_KERNEL); |
335 | if (!leds_data) |
336 | return -ENOMEM; |
337 | |
338 | for (i = 0; i < pdata->num_leds; i++) { |
339 | ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]); |
340 | if (ret < 0) { |
341 | for (i = i - 1; i >= 0; i--) |
342 | delete_ns2_led(&leds_data[i]); |
343 | return ret; |
344 | } |
345 | } |
346 | |
347 | platform_set_drvdata(pdev, leds_data); |
348 | |
349 | return 0; |
350 | } |
351 | |
352 | static int ns2_led_remove(struct platform_device *pdev) |
353 | { |
354 | int i; |
355 | struct ns2_led_platform_data *pdata = pdev->dev.platform_data; |
356 | struct ns2_led_data *leds_data; |
357 | |
358 | leds_data = platform_get_drvdata(pdev); |
359 | |
360 | for (i = 0; i < pdata->num_leds; i++) |
361 | delete_ns2_led(&leds_data[i]); |
362 | |
363 | platform_set_drvdata(pdev, NULL); |
364 | |
365 | return 0; |
366 | } |
367 | |
368 | static struct platform_driver ns2_led_driver = { |
369 | .probe = ns2_led_probe, |
370 | .remove = ns2_led_remove, |
371 | .driver = { |
372 | .name = "leds-ns2", |
373 | .owner = THIS_MODULE, |
374 | .of_match_table = of_match_ptr(of_ns2_leds_match), |
375 | }, |
376 | }; |
377 | |
378 | module_platform_driver(ns2_led_driver); |
379 | |
380 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); |
381 | MODULE_DESCRIPTION("Network Space v2 LED driver"); |
382 | MODULE_LICENSE("GPL"); |
383 | MODULE_ALIAS("platform:leds-ns2"); |
384 |
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