blob: f2e51c13439962391626b682337e912ca2a83bfb [file] [log] [blame]
Simon Guinot24467832010-10-07 16:38:49 +02001/*
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
37static DEFINE_SPINLOCK(gpio_ext_lock);
38
39static 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
47static 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
55static 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
62static 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
74static 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++) {
84 err = gpio_request(gpio_ext->addr[i], "GPIO extension addr");
85 if (err)
86 goto err_free_addr;
87 err = gpio_direction_output(gpio_ext->addr[i], 0);
88 if (err) {
89 gpio_free(gpio_ext->addr[i]);
90 goto err_free_addr;
91 }
92 }
93 /* Configure data GPIOs. */
94 for (i = 0; i < gpio_ext->num_data; i++) {
95 err = gpio_request(gpio_ext->data[i], "GPIO extension data");
96 if (err)
97 goto err_free_data;
98 err = gpio_direction_output(gpio_ext->data[i], 0);
99 if (err) {
100 gpio_free(gpio_ext->data[i]);
101 goto err_free_data;
102 }
103 }
104 /* Configure "enable select" GPIO. */
105 err = gpio_request(gpio_ext->enable, "GPIO extension enable");
106 if (err)
107 goto err_free_data;
108 err = gpio_direction_output(gpio_ext->enable, 0);
109 if (err) {
110 gpio_free(gpio_ext->enable);
111 goto err_free_data;
112 }
113
114 return 0;
115
116err_free_data:
117 for (i = i - 1; i >= 0; i--)
118 gpio_free(gpio_ext->data[i]);
119 i = gpio_ext->num_addr;
120err_free_addr:
121 for (i = i - 1; i >= 0; i--)
122 gpio_free(gpio_ext->addr[i]);
123
124 return err;
125}
126
127static void __devexit gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
128{
129 int i;
130
131 gpio_free(gpio_ext->enable);
132 for (i = gpio_ext->num_addr - 1; i >= 0; i--)
133 gpio_free(gpio_ext->addr[i]);
134 for (i = gpio_ext->num_data - 1; i >= 0; i--)
135 gpio_free(gpio_ext->data[i]);
136}
137
138/*
139 * Class LED driver.
140 */
141
142struct netxbig_led_data {
143 struct netxbig_gpio_ext *gpio_ext;
144 struct led_classdev cdev;
145 int mode_addr;
146 int *mode_val;
147 int bright_addr;
148 int bright_max;
149 struct netxbig_led_timer *timer;
150 int num_timer;
151 enum netxbig_led_mode mode;
152 int sata;
153 spinlock_t lock;
154};
155
156static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
157 unsigned long delay_on,
158 unsigned long delay_off,
159 struct netxbig_led_timer *timer,
160 int num_timer)
161{
162 int i;
163
164 for (i = 0; i < num_timer; i++) {
165 if (timer[i].delay_on == delay_on &&
166 timer[i].delay_off == delay_off) {
167 *mode = timer[i].mode;
168 return 0;
169 }
170 }
171 return -EINVAL;
172}
173
174static int netxbig_led_blink_set(struct led_classdev *led_cdev,
175 unsigned long *delay_on,
176 unsigned long *delay_off)
177{
178 struct netxbig_led_data *led_dat =
179 container_of(led_cdev, struct netxbig_led_data, cdev);
180 enum netxbig_led_mode mode;
181 int mode_val;
182 int ret;
183
184 /* Look for a LED mode with the requested timer frequency. */
185 ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
186 led_dat->timer, led_dat->num_timer);
187 if (ret < 0)
188 return ret;
189
190 mode_val = led_dat->mode_val[mode];
191 if (mode_val == NETXBIG_LED_INVALID_MODE)
192 return -EINVAL;
193
194 spin_lock_irq(&led_dat->lock);
195
196 gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
197 led_dat->mode = mode;
198
199 spin_unlock_irq(&led_dat->lock);
200
201 return 0;
202}
203
204static void netxbig_led_set(struct led_classdev *led_cdev,
205 enum led_brightness value)
206{
207 struct netxbig_led_data *led_dat =
208 container_of(led_cdev, struct netxbig_led_data, cdev);
209 enum netxbig_led_mode mode;
210 int mode_val, bright_val;
211 int set_brightness = 1;
212 unsigned long flags;
213
214 spin_lock_irqsave(&led_dat->lock, flags);
215
216 if (value == LED_OFF) {
217 mode = NETXBIG_LED_OFF;
218 set_brightness = 0;
219 } else {
220 if (led_dat->sata)
221 mode = NETXBIG_LED_SATA;
222 else if (led_dat->mode == NETXBIG_LED_OFF)
223 mode = NETXBIG_LED_ON;
224 else /* Keep 'timer' mode. */
225 mode = led_dat->mode;
226 }
227 mode_val = led_dat->mode_val[mode];
228
229 gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
230 led_dat->mode = mode;
231 /*
232 * Note that the brightness register is shared between all the
233 * SATA LEDs. So, change the brightness setting for a single
234 * SATA LED will affect all the others.
235 */
236 if (set_brightness) {
237 bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
238 LED_FULL);
239 gpio_ext_set_value(led_dat->gpio_ext,
240 led_dat->bright_addr, bright_val);
241 }
242
243 spin_unlock_irqrestore(&led_dat->lock, flags);
244}
245
246static ssize_t netxbig_led_sata_store(struct device *dev,
247 struct device_attribute *attr,
248 const char *buff, size_t count)
249{
250 struct led_classdev *led_cdev = dev_get_drvdata(dev);
251 struct netxbig_led_data *led_dat =
252 container_of(led_cdev, struct netxbig_led_data, cdev);
253 unsigned long enable;
254 enum netxbig_led_mode mode;
255 int mode_val;
256 int ret;
257
258 ret = strict_strtoul(buff, 10, &enable);
259 if (ret < 0)
260 return ret;
261
262 enable = !!enable;
263
264 spin_lock_irq(&led_dat->lock);
265
266 if (led_dat->sata == enable) {
267 ret = count;
268 goto exit_unlock;
269 }
270
271 if (led_dat->mode != NETXBIG_LED_ON &&
272 led_dat->mode != NETXBIG_LED_SATA)
273 mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
274 else if (enable)
275 mode = NETXBIG_LED_SATA;
276 else
277 mode = NETXBIG_LED_ON;
278
279 mode_val = led_dat->mode_val[mode];
280 if (mode_val == NETXBIG_LED_INVALID_MODE) {
281 ret = -EINVAL;
282 goto exit_unlock;
283 }
284
285 gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
286 led_dat->mode = mode;
287 led_dat->sata = enable;
288
289 ret = count;
290
291exit_unlock:
292 spin_unlock_irq(&led_dat->lock);
293
294 return ret;
295}
296
297static ssize_t netxbig_led_sata_show(struct device *dev,
298 struct device_attribute *attr, char *buf)
299{
300 struct led_classdev *led_cdev = dev_get_drvdata(dev);
301 struct netxbig_led_data *led_dat =
302 container_of(led_cdev, struct netxbig_led_data, cdev);
303
304 return sprintf(buf, "%d\n", led_dat->sata);
305}
306
307static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
308
309static void __devexit delete_netxbig_led(struct netxbig_led_data *led_dat)
310{
311 if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
312 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
313 led_classdev_unregister(&led_dat->cdev);
314}
315
316static int __devinit
317create_netxbig_led(struct platform_device *pdev,
318 struct netxbig_led_data *led_dat,
319 const struct netxbig_led *template)
320{
321 struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
322 int ret;
323
324 spin_lock_init(&led_dat->lock);
325 led_dat->gpio_ext = pdata->gpio_ext;
326 led_dat->cdev.name = template->name;
327 led_dat->cdev.default_trigger = template->default_trigger;
328 led_dat->cdev.blink_set = netxbig_led_blink_set;
329 led_dat->cdev.brightness_set = netxbig_led_set;
330 /*
331 * Because the GPIO extension bus don't allow to read registers
332 * value, there is no way to probe the LED initial state.
333 * So, the initial sysfs LED value for the "brightness" and "sata"
334 * attributes are inconsistent.
335 *
336 * Note that the initial LED state can't be reconfigured.
337 * The reason is that the LED behaviour must stay uniform during
338 * the whole boot process (bootloader+linux).
339 */
340 led_dat->sata = 0;
341 led_dat->cdev.brightness = LED_OFF;
342 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
343 led_dat->mode_addr = template->mode_addr;
344 led_dat->mode_val = template->mode_val;
345 led_dat->bright_addr = template->bright_addr;
346 led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
347 led_dat->timer = pdata->timer;
348 led_dat->num_timer = pdata->num_timer;
349
350 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
351 if (ret < 0)
352 return ret;
353
354 /*
355 * If available, expose the SATA activity blink capability through
356 * a "sata" sysfs attribute.
357 */
358 if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
359 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
360 if (ret)
361 led_classdev_unregister(&led_dat->cdev);
362 }
363
364 return ret;
365}
366
367static int __devinit netxbig_led_probe(struct platform_device *pdev)
368{
369 struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
370 struct netxbig_led_data *leds_data;
371 int i;
372 int ret;
373
374 if (!pdata)
375 return -EINVAL;
376
377 leds_data = kzalloc(sizeof(struct netxbig_led_data) * pdata->num_leds,
378 GFP_KERNEL);
379 if (!leds_data)
380 return -ENOMEM;
381
382 ret = gpio_ext_init(pdata->gpio_ext);
383 if (ret < 0)
384 goto err_free_data;
385
386 for (i = 0; i < pdata->num_leds; i++) {
387 ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
388 if (ret < 0)
389 goto err_free_leds;
390 }
391
392 platform_set_drvdata(pdev, leds_data);
393
394 return 0;
395
396err_free_leds:
397 for (i = i - 1; i >= 0; i--)
398 delete_netxbig_led(&leds_data[i]);
399
400 gpio_ext_free(pdata->gpio_ext);
401err_free_data:
402 kfree(leds_data);
403
404 return ret;
405}
406
407static int __devexit netxbig_led_remove(struct platform_device *pdev)
408{
409 struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
410 struct netxbig_led_data *leds_data;
411 int i;
412
413 leds_data = platform_get_drvdata(pdev);
414
415 for (i = 0; i < pdata->num_leds; i++)
416 delete_netxbig_led(&leds_data[i]);
417
418 gpio_ext_free(pdata->gpio_ext);
419 kfree(leds_data);
420
421 return 0;
422}
423
424static struct platform_driver netxbig_led_driver = {
425 .probe = netxbig_led_probe,
426 .remove = __devexit_p(netxbig_led_remove),
427 .driver = {
428 .name = "leds-netxbig",
429 .owner = THIS_MODULE,
430 },
431};
432MODULE_ALIAS("platform:leds-netxbig");
433
434static int __init netxbig_led_init(void)
435{
436 return platform_driver_register(&netxbig_led_driver);
437}
438
439static void __exit netxbig_led_exit(void)
440{
441 platform_driver_unregister(&netxbig_led_driver);
442}
443
444module_init(netxbig_led_init);
445module_exit(netxbig_led_exit);
446
447MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
448MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
449MODULE_LICENSE("GPL");