Root/drivers/leds/leds-netxbig.c

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

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