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24467832 SG |
1 | /* |
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> | |
24467832 SG |
24 | #include <linux/irq.h> |
25 | #include <linux/slab.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/gpio.h> | |
29 | #include <linux/leds.h> | |
c02cecb9 | 30 | #include <linux/platform_data/leds-kirkwood-netxbig.h> |
24467832 SG |
31 | |
32 | /* | |
33 | * GPIO extension bus. | |
34 | */ | |
35 | ||
36 | static DEFINE_SPINLOCK(gpio_ext_lock); | |
37 | ||
38 | static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr) | |
39 | { | |
40 | int pin; | |
41 | ||
42 | for (pin = 0; pin < gpio_ext->num_addr; pin++) | |
43 | gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1); | |
44 | } | |
45 | ||
46 | static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data) | |
47 | { | |
48 | int pin; | |
49 | ||
50 | for (pin = 0; pin < gpio_ext->num_data; pin++) | |
51 | gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1); | |
52 | } | |
53 | ||
54 | static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext) | |
55 | { | |
56 | /* Enable select is done on the raising edge. */ | |
57 | gpio_set_value(gpio_ext->enable, 0); | |
58 | gpio_set_value(gpio_ext->enable, 1); | |
59 | } | |
60 | ||
61 | static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext, | |
62 | int addr, int value) | |
63 | { | |
64 | unsigned long flags; | |
65 | ||
66 | spin_lock_irqsave(&gpio_ext_lock, flags); | |
67 | gpio_ext_set_addr(gpio_ext, addr); | |
68 | gpio_ext_set_data(gpio_ext, value); | |
69 | gpio_ext_enable_select(gpio_ext); | |
70 | spin_unlock_irqrestore(&gpio_ext_lock, flags); | |
71 | } | |
72 | ||
98ea1ea2 | 73 | static int gpio_ext_init(struct netxbig_gpio_ext *gpio_ext) |
24467832 SG |
74 | { |
75 | int err; | |
76 | int i; | |
77 | ||
78 | if (unlikely(!gpio_ext)) | |
79 | return -EINVAL; | |
80 | ||
81 | /* Configure address GPIOs. */ | |
82 | for (i = 0; i < gpio_ext->num_addr; i++) { | |
b96a573f AL |
83 | err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW, |
84 | "GPIO extension addr"); | |
24467832 SG |
85 | if (err) |
86 | goto err_free_addr; | |
24467832 SG |
87 | } |
88 | /* Configure data GPIOs. */ | |
89 | for (i = 0; i < gpio_ext->num_data; i++) { | |
b96a573f AL |
90 | err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW, |
91 | "GPIO extension data"); | |
24467832 SG |
92 | if (err) |
93 | goto err_free_data; | |
24467832 SG |
94 | } |
95 | /* Configure "enable select" GPIO. */ | |
b96a573f AL |
96 | err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW, |
97 | "GPIO extension enable"); | |
24467832 SG |
98 | if (err) |
99 | goto err_free_data; | |
24467832 SG |
100 | |
101 | return 0; | |
102 | ||
103 | err_free_data: | |
104 | for (i = i - 1; i >= 0; i--) | |
105 | gpio_free(gpio_ext->data[i]); | |
106 | i = gpio_ext->num_addr; | |
107 | err_free_addr: | |
108 | for (i = i - 1; i >= 0; i--) | |
109 | gpio_free(gpio_ext->addr[i]); | |
110 | ||
111 | return err; | |
112 | } | |
113 | ||
b8cd742a | 114 | static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext) |
24467832 SG |
115 | { |
116 | int i; | |
117 | ||
118 | gpio_free(gpio_ext->enable); | |
119 | for (i = gpio_ext->num_addr - 1; i >= 0; i--) | |
120 | gpio_free(gpio_ext->addr[i]); | |
121 | for (i = gpio_ext->num_data - 1; i >= 0; i--) | |
122 | gpio_free(gpio_ext->data[i]); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Class LED driver. | |
127 | */ | |
128 | ||
129 | struct netxbig_led_data { | |
130 | struct netxbig_gpio_ext *gpio_ext; | |
131 | struct led_classdev cdev; | |
132 | int mode_addr; | |
133 | int *mode_val; | |
134 | int bright_addr; | |
135 | int bright_max; | |
136 | struct netxbig_led_timer *timer; | |
137 | int num_timer; | |
138 | enum netxbig_led_mode mode; | |
139 | int sata; | |
140 | spinlock_t lock; | |
141 | }; | |
142 | ||
143 | static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode, | |
144 | unsigned long delay_on, | |
145 | unsigned long delay_off, | |
146 | struct netxbig_led_timer *timer, | |
147 | int num_timer) | |
148 | { | |
149 | int i; | |
150 | ||
151 | for (i = 0; i < num_timer; i++) { | |
152 | if (timer[i].delay_on == delay_on && | |
153 | timer[i].delay_off == delay_off) { | |
154 | *mode = timer[i].mode; | |
155 | return 0; | |
156 | } | |
157 | } | |
158 | return -EINVAL; | |
159 | } | |
160 | ||
161 | static int netxbig_led_blink_set(struct led_classdev *led_cdev, | |
162 | unsigned long *delay_on, | |
163 | unsigned long *delay_off) | |
164 | { | |
165 | struct netxbig_led_data *led_dat = | |
166 | container_of(led_cdev, struct netxbig_led_data, cdev); | |
167 | enum netxbig_led_mode mode; | |
168 | int mode_val; | |
169 | int ret; | |
170 | ||
171 | /* Look for a LED mode with the requested timer frequency. */ | |
172 | ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off, | |
173 | led_dat->timer, led_dat->num_timer); | |
174 | if (ret < 0) | |
175 | return ret; | |
176 | ||
177 | mode_val = led_dat->mode_val[mode]; | |
178 | if (mode_val == NETXBIG_LED_INVALID_MODE) | |
179 | return -EINVAL; | |
180 | ||
181 | spin_lock_irq(&led_dat->lock); | |
182 | ||
183 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); | |
184 | led_dat->mode = mode; | |
185 | ||
186 | spin_unlock_irq(&led_dat->lock); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static void netxbig_led_set(struct led_classdev *led_cdev, | |
192 | enum led_brightness value) | |
193 | { | |
194 | struct netxbig_led_data *led_dat = | |
195 | container_of(led_cdev, struct netxbig_led_data, cdev); | |
196 | enum netxbig_led_mode mode; | |
197 | int mode_val, bright_val; | |
198 | int set_brightness = 1; | |
199 | unsigned long flags; | |
200 | ||
201 | spin_lock_irqsave(&led_dat->lock, flags); | |
202 | ||
203 | if (value == LED_OFF) { | |
204 | mode = NETXBIG_LED_OFF; | |
205 | set_brightness = 0; | |
206 | } else { | |
207 | if (led_dat->sata) | |
208 | mode = NETXBIG_LED_SATA; | |
209 | else if (led_dat->mode == NETXBIG_LED_OFF) | |
210 | mode = NETXBIG_LED_ON; | |
211 | else /* Keep 'timer' mode. */ | |
212 | mode = led_dat->mode; | |
213 | } | |
214 | mode_val = led_dat->mode_val[mode]; | |
215 | ||
216 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); | |
217 | led_dat->mode = mode; | |
218 | /* | |
219 | * Note that the brightness register is shared between all the | |
220 | * SATA LEDs. So, change the brightness setting for a single | |
221 | * SATA LED will affect all the others. | |
222 | */ | |
223 | if (set_brightness) { | |
224 | bright_val = DIV_ROUND_UP(value * led_dat->bright_max, | |
225 | LED_FULL); | |
226 | gpio_ext_set_value(led_dat->gpio_ext, | |
227 | led_dat->bright_addr, bright_val); | |
228 | } | |
229 | ||
230 | spin_unlock_irqrestore(&led_dat->lock, flags); | |
231 | } | |
232 | ||
233 | static ssize_t netxbig_led_sata_store(struct device *dev, | |
234 | struct device_attribute *attr, | |
235 | const char *buff, size_t count) | |
236 | { | |
237 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
238 | struct netxbig_led_data *led_dat = | |
239 | container_of(led_cdev, struct netxbig_led_data, cdev); | |
240 | unsigned long enable; | |
241 | enum netxbig_led_mode mode; | |
242 | int mode_val; | |
243 | int ret; | |
244 | ||
7517611a | 245 | ret = kstrtoul(buff, 10, &enable); |
24467832 SG |
246 | if (ret < 0) |
247 | return ret; | |
248 | ||
249 | enable = !!enable; | |
250 | ||
251 | spin_lock_irq(&led_dat->lock); | |
252 | ||
253 | if (led_dat->sata == enable) { | |
254 | ret = count; | |
255 | goto exit_unlock; | |
256 | } | |
257 | ||
258 | if (led_dat->mode != NETXBIG_LED_ON && | |
259 | led_dat->mode != NETXBIG_LED_SATA) | |
260 | mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */ | |
261 | else if (enable) | |
262 | mode = NETXBIG_LED_SATA; | |
263 | else | |
264 | mode = NETXBIG_LED_ON; | |
265 | ||
266 | mode_val = led_dat->mode_val[mode]; | |
267 | if (mode_val == NETXBIG_LED_INVALID_MODE) { | |
268 | ret = -EINVAL; | |
269 | goto exit_unlock; | |
270 | } | |
271 | ||
272 | gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); | |
273 | led_dat->mode = mode; | |
274 | led_dat->sata = enable; | |
275 | ||
276 | ret = count; | |
277 | ||
278 | exit_unlock: | |
279 | spin_unlock_irq(&led_dat->lock); | |
280 | ||
281 | return ret; | |
282 | } | |
283 | ||
284 | static ssize_t netxbig_led_sata_show(struct device *dev, | |
285 | struct device_attribute *attr, char *buf) | |
286 | { | |
287 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
288 | struct netxbig_led_data *led_dat = | |
289 | container_of(led_cdev, struct netxbig_led_data, cdev); | |
290 | ||
291 | return sprintf(buf, "%d\n", led_dat->sata); | |
292 | } | |
293 | ||
294 | static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store); | |
295 | ||
b8cd742a | 296 | static void delete_netxbig_led(struct netxbig_led_data *led_dat) |
24467832 SG |
297 | { |
298 | if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) | |
299 | device_remove_file(led_dat->cdev.dev, &dev_attr_sata); | |
300 | led_classdev_unregister(&led_dat->cdev); | |
301 | } | |
302 | ||
98ea1ea2 | 303 | static int |
24467832 SG |
304 | create_netxbig_led(struct platform_device *pdev, |
305 | struct netxbig_led_data *led_dat, | |
306 | const struct netxbig_led *template) | |
307 | { | |
87aae1ea | 308 | struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
24467832 SG |
309 | int ret; |
310 | ||
311 | spin_lock_init(&led_dat->lock); | |
312 | led_dat->gpio_ext = pdata->gpio_ext; | |
313 | led_dat->cdev.name = template->name; | |
314 | led_dat->cdev.default_trigger = template->default_trigger; | |
315 | led_dat->cdev.blink_set = netxbig_led_blink_set; | |
316 | led_dat->cdev.brightness_set = netxbig_led_set; | |
317 | /* | |
318 | * Because the GPIO extension bus don't allow to read registers | |
319 | * value, there is no way to probe the LED initial state. | |
320 | * So, the initial sysfs LED value for the "brightness" and "sata" | |
321 | * attributes are inconsistent. | |
322 | * | |
323 | * Note that the initial LED state can't be reconfigured. | |
324 | * The reason is that the LED behaviour must stay uniform during | |
325 | * the whole boot process (bootloader+linux). | |
326 | */ | |
327 | led_dat->sata = 0; | |
328 | led_dat->cdev.brightness = LED_OFF; | |
329 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
330 | led_dat->mode_addr = template->mode_addr; | |
331 | led_dat->mode_val = template->mode_val; | |
332 | led_dat->bright_addr = template->bright_addr; | |
333 | led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1; | |
334 | led_dat->timer = pdata->timer; | |
335 | led_dat->num_timer = pdata->num_timer; | |
336 | ||
337 | ret = led_classdev_register(&pdev->dev, &led_dat->cdev); | |
338 | if (ret < 0) | |
339 | return ret; | |
340 | ||
341 | /* | |
342 | * If available, expose the SATA activity blink capability through | |
343 | * a "sata" sysfs attribute. | |
344 | */ | |
345 | if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) { | |
346 | ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); | |
347 | if (ret) | |
348 | led_classdev_unregister(&led_dat->cdev); | |
349 | } | |
350 | ||
351 | return ret; | |
352 | } | |
353 | ||
98ea1ea2 | 354 | static int netxbig_led_probe(struct platform_device *pdev) |
24467832 | 355 | { |
87aae1ea | 356 | struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
24467832 SG |
357 | struct netxbig_led_data *leds_data; |
358 | int i; | |
359 | int ret; | |
360 | ||
361 | if (!pdata) | |
362 | return -EINVAL; | |
363 | ||
8095c385 BW |
364 | leds_data = devm_kzalloc(&pdev->dev, |
365 | sizeof(struct netxbig_led_data) * pdata->num_leds, GFP_KERNEL); | |
24467832 SG |
366 | if (!leds_data) |
367 | return -ENOMEM; | |
368 | ||
369 | ret = gpio_ext_init(pdata->gpio_ext); | |
370 | if (ret < 0) | |
8095c385 | 371 | return ret; |
24467832 SG |
372 | |
373 | for (i = 0; i < pdata->num_leds; i++) { | |
374 | ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]); | |
375 | if (ret < 0) | |
376 | goto err_free_leds; | |
377 | } | |
378 | ||
379 | platform_set_drvdata(pdev, leds_data); | |
380 | ||
381 | return 0; | |
382 | ||
383 | err_free_leds: | |
384 | for (i = i - 1; i >= 0; i--) | |
385 | delete_netxbig_led(&leds_data[i]); | |
386 | ||
387 | gpio_ext_free(pdata->gpio_ext); | |
24467832 SG |
388 | return ret; |
389 | } | |
390 | ||
678e8a6b | 391 | static int netxbig_led_remove(struct platform_device *pdev) |
24467832 | 392 | { |
87aae1ea | 393 | struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
24467832 SG |
394 | struct netxbig_led_data *leds_data; |
395 | int i; | |
396 | ||
397 | leds_data = platform_get_drvdata(pdev); | |
398 | ||
399 | for (i = 0; i < pdata->num_leds; i++) | |
400 | delete_netxbig_led(&leds_data[i]); | |
401 | ||
402 | gpio_ext_free(pdata->gpio_ext); | |
24467832 SG |
403 | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static struct platform_driver netxbig_led_driver = { | |
408 | .probe = netxbig_led_probe, | |
df07cf81 | 409 | .remove = netxbig_led_remove, |
24467832 SG |
410 | .driver = { |
411 | .name = "leds-netxbig", | |
412 | .owner = THIS_MODULE, | |
413 | }, | |
414 | }; | |
24467832 | 415 | |
892a8843 | 416 | module_platform_driver(netxbig_led_driver); |
24467832 SG |
417 | |
418 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
419 | MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards"); | |
420 | MODULE_LICENSE("GPL"); | |
892a8843 | 421 | MODULE_ALIAS("platform:leds-netxbig"); |