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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 <mach/leds-ns2.h>
32
33/*
34 * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
35 * relation with the SATA activity. This capability is exposed through the
36 * "sata" sysfs attribute.
37 *
38 * The following array detail the different LED registers and the combination
39 * of their possible values:
40 *
41 * cmd_led | slow_led | /SATA active | LED state
42 * | | |
43 * 1 | 0 | x | off
44 * - | 1 | x | on
45 * 0 | 0 | 1 | on
46 * 0 | 0 | 0 | blink (rate 300ms)
47 */
48
49enum ns2_led_modes {
50 NS_V2_LED_OFF,
51 NS_V2_LED_ON,
52 NS_V2_LED_SATA,
53};
54
55struct ns2_led_mode_value {
56 enum ns2_led_modes mode;
57 int cmd_level;
58 int slow_level;
59};
60
61static struct ns2_led_mode_value ns2_led_modval[] = {
62 { NS_V2_LED_OFF , 1, 0 },
63 { NS_V2_LED_ON , 0, 1 },
64 { NS_V2_LED_ON , 1, 1 },
65 { NS_V2_LED_SATA, 0, 0 },
66};
67
68struct ns2_led_data {
69 struct led_classdev cdev;
70 unsigned cmd;
71 unsigned slow;
72 unsigned char sata; /* True when SATA mode active. */
73 rwlock_t rw_lock; /* Lock GPIOs. */
74};
75
76static int ns2_led_get_mode(struct ns2_led_data *led_dat,
77 enum ns2_led_modes *mode)
78{
79 int i;
80 int ret = -EINVAL;
81 int cmd_level;
82 int slow_level;
83
84 read_lock_irq(&led_dat->rw_lock);
85
86 cmd_level = gpio_get_value(led_dat->cmd);
87 slow_level = gpio_get_value(led_dat->slow);
88
89 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
90 if (cmd_level == ns2_led_modval[i].cmd_level &&
91 slow_level == ns2_led_modval[i].slow_level) {
92 *mode = ns2_led_modval[i].mode;
93 ret = 0;
94 break;
95 }
96 }
97
98 read_unlock_irq(&led_dat->rw_lock);
99
100 return ret;
101}
102
103static void ns2_led_set_mode(struct ns2_led_data *led_dat,
104 enum ns2_led_modes mode)
105{
106 int i;
107 unsigned long flags;
108
109 write_lock_irqsave(&led_dat->rw_lock, flags);
110
111 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
112 if (mode == ns2_led_modval[i].mode) {
113 gpio_set_value(led_dat->cmd,
114 ns2_led_modval[i].cmd_level);
115 gpio_set_value(led_dat->slow,
116 ns2_led_modval[i].slow_level);
117 }
118 }
119
120 write_unlock_irqrestore(&led_dat->rw_lock, flags);
121}
122
123static void ns2_led_set(struct led_classdev *led_cdev,
124 enum led_brightness value)
125{
126 struct ns2_led_data *led_dat =
127 container_of(led_cdev, struct ns2_led_data, cdev);
128 enum ns2_led_modes mode;
129
130 if (value == LED_OFF)
131 mode = NS_V2_LED_OFF;
132 else if (led_dat->sata)
133 mode = NS_V2_LED_SATA;
134 else
135 mode = NS_V2_LED_ON;
136
137 ns2_led_set_mode(led_dat, mode);
138}
139
140static ssize_t ns2_led_sata_store(struct device *dev,
141 struct device_attribute *attr,
142 const char *buff, size_t count)
143{
144 struct led_classdev *led_cdev = dev_get_drvdata(dev);
145 struct ns2_led_data *led_dat =
146 container_of(led_cdev, struct ns2_led_data, cdev);
147 int ret;
148 unsigned long enable;
149 enum ns2_led_modes mode;
150
151 ret = strict_strtoul(buff, 10, &enable);
152 if (ret < 0)
153 return ret;
154
155 enable = !!enable;
156
157 if (led_dat->sata == enable)
158 return count;
159
160 ret = ns2_led_get_mode(led_dat, &mode);
161 if (ret < 0)
162 return ret;
163
164 if (enable && mode == NS_V2_LED_ON)
165 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
166 if (!enable && mode == NS_V2_LED_SATA)
167 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
168
169 led_dat->sata = enable;
170
171 return count;
172}
173
174static ssize_t ns2_led_sata_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
176{
177 struct led_classdev *led_cdev = dev_get_drvdata(dev);
178 struct ns2_led_data *led_dat =
179 container_of(led_cdev, struct ns2_led_data, cdev);
180
181 return sprintf(buf, "%d\n", led_dat->sata);
182}
183
184static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
185
186static int __devinit
187create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
188 const struct ns2_led *template)
189{
190 int ret;
191 enum ns2_led_modes mode;
192
193 ret = gpio_request(template->cmd, template->name);
194 if (ret == 0) {
195 ret = gpio_direction_output(template->cmd,
196 gpio_get_value(template->cmd));
197 if (ret)
198 gpio_free(template->cmd);
199 }
200 if (ret) {
201 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
202 template->name);
203 }
204
205 ret = gpio_request(template->slow, template->name);
206 if (ret == 0) {
207 ret = gpio_direction_output(template->slow,
208 gpio_get_value(template->slow));
209 if (ret)
210 gpio_free(template->slow);
211 }
212 if (ret) {
213 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
214 template->name);
215 goto err_free_cmd;
216 }
217
218 rwlock_init(&led_dat->rw_lock);
219
220 led_dat->cdev.name = template->name;
221 led_dat->cdev.default_trigger = template->default_trigger;
222 led_dat->cdev.blink_set = NULL;
223 led_dat->cdev.brightness_set = ns2_led_set;
224 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
225 led_dat->cmd = template->cmd;
226 led_dat->slow = template->slow;
227
228 ret = ns2_led_get_mode(led_dat, &mode);
229 if (ret < 0)
230 goto err_free_slow;
231
232 /* Set LED initial state. */
233 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
234 led_dat->cdev.brightness =
235 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
236
237 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
238 if (ret < 0)
239 goto err_free_slow;
240
241 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
242 if (ret < 0)
243 goto err_free_cdev;
244
245 return 0;
246
247err_free_cdev:
248 led_classdev_unregister(&led_dat->cdev);
249err_free_slow:
250 gpio_free(led_dat->slow);
251err_free_cmd:
252 gpio_free(led_dat->cmd);
253
254 return ret;
255}
256
257static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
258{
259 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
260 led_classdev_unregister(&led_dat->cdev);
261 gpio_free(led_dat->cmd);
262 gpio_free(led_dat->slow);
263}
264
265static int __devinit ns2_led_probe(struct platform_device *pdev)
266{
267 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
268 struct ns2_led_data *leds_data;
269 int i;
270 int ret;
271
272 if (!pdata)
273 return -EINVAL;
274
275 leds_data = kzalloc(sizeof(struct ns2_led_data) *
276 pdata->num_leds, GFP_KERNEL);
277 if (!leds_data)
278 return -ENOMEM;
279
280 for (i = 0; i < pdata->num_leds; i++) {
281 ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
282 if (ret < 0)
283 goto err;
284
285 }
286
287 platform_set_drvdata(pdev, leds_data);
288
289 return 0;
290
291err:
292 for (i = i - 1; i >= 0; i--)
293 delete_ns2_led(&leds_data[i]);
294
295 kfree(leds_data);
296
297 return ret;
298}
299
300static int __devexit ns2_led_remove(struct platform_device *pdev)
301{
302 int i;
303 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
304 struct ns2_led_data *leds_data;
305
306 leds_data = platform_get_drvdata(pdev);
307
308 for (i = 0; i < pdata->num_leds; i++)
309 delete_ns2_led(&leds_data[i]);
310
311 kfree(leds_data);
312 platform_set_drvdata(pdev, NULL);
313
314 return 0;
315}
316
317static struct platform_driver ns2_led_driver = {
318 .probe = ns2_led_probe,
319 .remove = __devexit_p(ns2_led_remove),
320 .driver = {
321 .name = "leds-ns2",
322 .owner = THIS_MODULE,
323 },
324};
325MODULE_ALIAS("platform:leds-ns2");
326
327static int __init ns2_led_init(void)
328{
329 return platform_driver_register(&ns2_led_driver);
330}
331
332static void __exit ns2_led_exit(void)
333{
334 platform_driver_unregister(&ns2_led_driver);
335}
336
337module_init(ns2_led_init);
338module_exit(ns2_led_exit);
339
340MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
341MODULE_DESCRIPTION("Network Space v2 LED driver");
342MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
4 *
5 * Copyright (C) 2010 LaCie
6 *
7 * Author: Simon Guinot <sguinot@lacie.com>
8 *
9 * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
10 */
11
12#include <linux/kernel.h>
13#include <linux/platform_device.h>
14#include <linux/slab.h>
15#include <linux/gpio.h>
16#include <linux/leds.h>
17#include <linux/module.h>
18#include <linux/platform_data/leds-kirkwood-ns2.h>
19#include <linux/of.h>
20#include <linux/of_gpio.h>
21#include "leds.h"
22
23/*
24 * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
25 * modes are available: off, on and SATA activity blinking. The LED modes are
26 * controlled through two GPIOs (command and slow): each combination of values
27 * for the command/slow GPIOs corresponds to a LED mode.
28 */
29
30struct ns2_led_data {
31 struct led_classdev cdev;
32 unsigned int cmd;
33 unsigned int slow;
34 bool can_sleep;
35 unsigned char sata; /* True when SATA mode active. */
36 rwlock_t rw_lock; /* Lock GPIOs. */
37 int num_modes;
38 struct ns2_led_modval *modval;
39};
40
41static int ns2_led_get_mode(struct ns2_led_data *led_dat,
42 enum ns2_led_modes *mode)
43{
44 int i;
45 int ret = -EINVAL;
46 int cmd_level;
47 int slow_level;
48
49 cmd_level = gpio_get_value_cansleep(led_dat->cmd);
50 slow_level = gpio_get_value_cansleep(led_dat->slow);
51
52 for (i = 0; i < led_dat->num_modes; i++) {
53 if (cmd_level == led_dat->modval[i].cmd_level &&
54 slow_level == led_dat->modval[i].slow_level) {
55 *mode = led_dat->modval[i].mode;
56 ret = 0;
57 break;
58 }
59 }
60
61 return ret;
62}
63
64static void ns2_led_set_mode(struct ns2_led_data *led_dat,
65 enum ns2_led_modes mode)
66{
67 int i;
68 bool found = false;
69 unsigned long flags;
70
71 for (i = 0; i < led_dat->num_modes; i++)
72 if (mode == led_dat->modval[i].mode) {
73 found = true;
74 break;
75 }
76
77 if (!found)
78 return;
79
80 write_lock_irqsave(&led_dat->rw_lock, flags);
81
82 if (!led_dat->can_sleep) {
83 gpio_set_value(led_dat->cmd,
84 led_dat->modval[i].cmd_level);
85 gpio_set_value(led_dat->slow,
86 led_dat->modval[i].slow_level);
87 goto exit_unlock;
88 }
89
90 gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
91 gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
92
93exit_unlock:
94 write_unlock_irqrestore(&led_dat->rw_lock, flags);
95}
96
97static void ns2_led_set(struct led_classdev *led_cdev,
98 enum led_brightness value)
99{
100 struct ns2_led_data *led_dat =
101 container_of(led_cdev, struct ns2_led_data, cdev);
102 enum ns2_led_modes mode;
103
104 if (value == LED_OFF)
105 mode = NS_V2_LED_OFF;
106 else if (led_dat->sata)
107 mode = NS_V2_LED_SATA;
108 else
109 mode = NS_V2_LED_ON;
110
111 ns2_led_set_mode(led_dat, mode);
112}
113
114static int ns2_led_set_blocking(struct led_classdev *led_cdev,
115 enum led_brightness value)
116{
117 ns2_led_set(led_cdev, value);
118 return 0;
119}
120
121static ssize_t ns2_led_sata_store(struct device *dev,
122 struct device_attribute *attr,
123 const char *buff, size_t count)
124{
125 struct led_classdev *led_cdev = dev_get_drvdata(dev);
126 struct ns2_led_data *led_dat =
127 container_of(led_cdev, struct ns2_led_data, cdev);
128 int ret;
129 unsigned long enable;
130
131 ret = kstrtoul(buff, 10, &enable);
132 if (ret < 0)
133 return ret;
134
135 enable = !!enable;
136
137 if (led_dat->sata == enable)
138 goto exit;
139
140 led_dat->sata = enable;
141
142 if (!led_get_brightness(led_cdev))
143 goto exit;
144
145 if (enable)
146 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
147 else
148 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
149
150exit:
151 return count;
152}
153
154static ssize_t ns2_led_sata_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156{
157 struct led_classdev *led_cdev = dev_get_drvdata(dev);
158 struct ns2_led_data *led_dat =
159 container_of(led_cdev, struct ns2_led_data, cdev);
160
161 return sprintf(buf, "%d\n", led_dat->sata);
162}
163
164static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
165
166static struct attribute *ns2_led_attrs[] = {
167 &dev_attr_sata.attr,
168 NULL
169};
170ATTRIBUTE_GROUPS(ns2_led);
171
172static int
173create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
174 const struct ns2_led *template)
175{
176 int ret;
177 enum ns2_led_modes mode;
178
179 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
180 gpio_get_value_cansleep(template->cmd) ?
181 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
182 template->name);
183 if (ret) {
184 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
185 template->name);
186 return ret;
187 }
188
189 ret = devm_gpio_request_one(&pdev->dev, template->slow,
190 gpio_get_value_cansleep(template->slow) ?
191 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
192 template->name);
193 if (ret) {
194 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
195 template->name);
196 return ret;
197 }
198
199 rwlock_init(&led_dat->rw_lock);
200
201 led_dat->cdev.name = template->name;
202 led_dat->cdev.default_trigger = template->default_trigger;
203 led_dat->cdev.blink_set = NULL;
204 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
205 led_dat->cdev.groups = ns2_led_groups;
206 led_dat->cmd = template->cmd;
207 led_dat->slow = template->slow;
208 led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
209 gpio_cansleep(led_dat->slow);
210 if (led_dat->can_sleep)
211 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
212 else
213 led_dat->cdev.brightness_set = ns2_led_set;
214 led_dat->modval = template->modval;
215 led_dat->num_modes = template->num_modes;
216
217 ret = ns2_led_get_mode(led_dat, &mode);
218 if (ret < 0)
219 return ret;
220
221 /* Set LED initial state. */
222 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
223 led_dat->cdev.brightness =
224 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
225
226 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
227 if (ret < 0)
228 return ret;
229
230 return 0;
231}
232
233static void delete_ns2_led(struct ns2_led_data *led_dat)
234{
235 led_classdev_unregister(&led_dat->cdev);
236}
237
238#ifdef CONFIG_OF_GPIO
239/*
240 * Translate OpenFirmware node properties into platform_data.
241 */
242static int
243ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
244{
245 struct device_node *np = dev->of_node;
246 struct device_node *child;
247 struct ns2_led *led, *leds;
248 int ret, num_leds = 0;
249
250 num_leds = of_get_child_count(np);
251 if (!num_leds)
252 return -ENODEV;
253
254 leds = devm_kcalloc(dev, num_leds, sizeof(struct ns2_led),
255 GFP_KERNEL);
256 if (!leds)
257 return -ENOMEM;
258
259 led = leds;
260 for_each_child_of_node(np, child) {
261 const char *string;
262 int i, num_modes;
263 struct ns2_led_modval *modval;
264
265 ret = of_get_named_gpio(child, "cmd-gpio", 0);
266 if (ret < 0)
267 goto err_node_put;
268 led->cmd = ret;
269 ret = of_get_named_gpio(child, "slow-gpio", 0);
270 if (ret < 0)
271 goto err_node_put;
272 led->slow = ret;
273 ret = of_property_read_string(child, "label", &string);
274 led->name = (ret == 0) ? string : child->name;
275 ret = of_property_read_string(child, "linux,default-trigger",
276 &string);
277 if (ret == 0)
278 led->default_trigger = string;
279
280 ret = of_property_count_u32_elems(child, "modes-map");
281 if (ret < 0 || ret % 3) {
282 dev_err(dev,
283 "Missing or malformed modes-map property\n");
284 ret = -EINVAL;
285 goto err_node_put;
286 }
287
288 num_modes = ret / 3;
289 modval = devm_kcalloc(dev,
290 num_modes,
291 sizeof(struct ns2_led_modval),
292 GFP_KERNEL);
293 if (!modval) {
294 ret = -ENOMEM;
295 goto err_node_put;
296 }
297
298 for (i = 0; i < num_modes; i++) {
299 of_property_read_u32_index(child,
300 "modes-map", 3 * i,
301 (u32 *) &modval[i].mode);
302 of_property_read_u32_index(child,
303 "modes-map", 3 * i + 1,
304 (u32 *) &modval[i].cmd_level);
305 of_property_read_u32_index(child,
306 "modes-map", 3 * i + 2,
307 (u32 *) &modval[i].slow_level);
308 }
309
310 led->num_modes = num_modes;
311 led->modval = modval;
312
313 led++;
314 }
315
316 pdata->leds = leds;
317 pdata->num_leds = num_leds;
318
319 return 0;
320
321err_node_put:
322 of_node_put(child);
323 return ret;
324}
325
326static const struct of_device_id of_ns2_leds_match[] = {
327 { .compatible = "lacie,ns2-leds", },
328 {},
329};
330MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
331#endif /* CONFIG_OF_GPIO */
332
333struct ns2_led_priv {
334 int num_leds;
335 struct ns2_led_data leds_data[];
336};
337
338static inline int sizeof_ns2_led_priv(int num_leds)
339{
340 return sizeof(struct ns2_led_priv) +
341 (sizeof(struct ns2_led_data) * num_leds);
342}
343
344static int ns2_led_probe(struct platform_device *pdev)
345{
346 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
347 struct ns2_led_priv *priv;
348 int i;
349 int ret;
350
351#ifdef CONFIG_OF_GPIO
352 if (!pdata) {
353 pdata = devm_kzalloc(&pdev->dev,
354 sizeof(struct ns2_led_platform_data),
355 GFP_KERNEL);
356 if (!pdata)
357 return -ENOMEM;
358
359 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
360 if (ret)
361 return ret;
362 }
363#else
364 if (!pdata)
365 return -EINVAL;
366#endif /* CONFIG_OF_GPIO */
367
368 priv = devm_kzalloc(&pdev->dev,
369 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
370 if (!priv)
371 return -ENOMEM;
372 priv->num_leds = pdata->num_leds;
373
374 for (i = 0; i < priv->num_leds; i++) {
375 ret = create_ns2_led(pdev, &priv->leds_data[i],
376 &pdata->leds[i]);
377 if (ret < 0) {
378 for (i = i - 1; i >= 0; i--)
379 delete_ns2_led(&priv->leds_data[i]);
380 return ret;
381 }
382 }
383
384 platform_set_drvdata(pdev, priv);
385
386 return 0;
387}
388
389static int ns2_led_remove(struct platform_device *pdev)
390{
391 int i;
392 struct ns2_led_priv *priv;
393
394 priv = platform_get_drvdata(pdev);
395
396 for (i = 0; i < priv->num_leds; i++)
397 delete_ns2_led(&priv->leds_data[i]);
398
399 return 0;
400}
401
402static struct platform_driver ns2_led_driver = {
403 .probe = ns2_led_probe,
404 .remove = ns2_led_remove,
405 .driver = {
406 .name = "leds-ns2",
407 .of_match_table = of_match_ptr(of_ns2_leds_match),
408 },
409};
410
411module_platform_driver(ns2_led_driver);
412
413MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
414MODULE_DESCRIPTION("Network Space v2 LED driver");
415MODULE_LICENSE("GPL");
416MODULE_ALIAS("platform:leds-ns2");