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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/consumer.h>
16#include <linux/leds.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include "leds.h"
20
21enum ns2_led_modes {
22 NS_V2_LED_OFF,
23 NS_V2_LED_ON,
24 NS_V2_LED_SATA,
25};
26
27/*
28 * If the size of this structure or types of its members is changed,
29 * the filling of array modval in function ns2_led_register must be changed
30 * accordingly.
31 */
32struct ns2_led_modval {
33 u32 mode;
34 u32 cmd_level;
35 u32 slow_level;
36} __packed;
37
38/*
39 * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
40 * modes are available: off, on and SATA activity blinking. The LED modes are
41 * controlled through two GPIOs (command and slow): each combination of values
42 * for the command/slow GPIOs corresponds to a LED mode.
43 */
44
45struct ns2_led {
46 struct led_classdev cdev;
47 struct gpio_desc *cmd;
48 struct gpio_desc *slow;
49 bool can_sleep;
50 unsigned char sata; /* True when SATA mode active. */
51 rwlock_t rw_lock; /* Lock GPIOs. */
52 int num_modes;
53 struct ns2_led_modval *modval;
54};
55
56static int ns2_led_get_mode(struct ns2_led *led, enum ns2_led_modes *mode)
57{
58 int i;
59 int cmd_level;
60 int slow_level;
61
62 cmd_level = gpiod_get_value_cansleep(led->cmd);
63 slow_level = gpiod_get_value_cansleep(led->slow);
64
65 for (i = 0; i < led->num_modes; i++) {
66 if (cmd_level == led->modval[i].cmd_level &&
67 slow_level == led->modval[i].slow_level) {
68 *mode = led->modval[i].mode;
69 return 0;
70 }
71 }
72
73 return -EINVAL;
74}
75
76static void ns2_led_set_mode(struct ns2_led *led, enum ns2_led_modes mode)
77{
78 int i;
79 unsigned long flags;
80
81 for (i = 0; i < led->num_modes; i++)
82 if (mode == led->modval[i].mode)
83 break;
84
85 if (i == led->num_modes)
86 return;
87
88 write_lock_irqsave(&led->rw_lock, flags);
89
90 if (!led->can_sleep) {
91 gpiod_set_value(led->cmd, led->modval[i].cmd_level);
92 gpiod_set_value(led->slow, led->modval[i].slow_level);
93 goto exit_unlock;
94 }
95
96 gpiod_set_value_cansleep(led->cmd, led->modval[i].cmd_level);
97 gpiod_set_value_cansleep(led->slow, led->modval[i].slow_level);
98
99exit_unlock:
100 write_unlock_irqrestore(&led->rw_lock, flags);
101}
102
103static void ns2_led_set(struct led_classdev *led_cdev,
104 enum led_brightness value)
105{
106 struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev);
107 enum ns2_led_modes mode;
108
109 if (value == LED_OFF)
110 mode = NS_V2_LED_OFF;
111 else if (led->sata)
112 mode = NS_V2_LED_SATA;
113 else
114 mode = NS_V2_LED_ON;
115
116 ns2_led_set_mode(led, mode);
117}
118
119static int ns2_led_set_blocking(struct led_classdev *led_cdev,
120 enum led_brightness value)
121{
122 ns2_led_set(led_cdev, value);
123 return 0;
124}
125
126static ssize_t ns2_led_sata_store(struct device *dev,
127 struct device_attribute *attr,
128 const char *buff, size_t count)
129{
130 struct led_classdev *led_cdev = dev_get_drvdata(dev);
131 struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev);
132 int ret;
133 unsigned long enable;
134
135 ret = kstrtoul(buff, 10, &enable);
136 if (ret < 0)
137 return ret;
138
139 enable = !!enable;
140
141 if (led->sata == enable)
142 goto exit;
143
144 led->sata = enable;
145
146 if (!led_get_brightness(led_cdev))
147 goto exit;
148
149 if (enable)
150 ns2_led_set_mode(led, NS_V2_LED_SATA);
151 else
152 ns2_led_set_mode(led, NS_V2_LED_ON);
153
154exit:
155 return count;
156}
157
158static ssize_t ns2_led_sata_show(struct device *dev,
159 struct device_attribute *attr, char *buf)
160{
161 struct led_classdev *led_cdev = dev_get_drvdata(dev);
162 struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev);
163
164 return sprintf(buf, "%d\n", led->sata);
165}
166
167static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
168
169static struct attribute *ns2_led_attrs[] = {
170 &dev_attr_sata.attr,
171 NULL
172};
173ATTRIBUTE_GROUPS(ns2_led);
174
175static int ns2_led_register(struct device *dev, struct fwnode_handle *node,
176 struct ns2_led *led)
177{
178 struct led_init_data init_data = {};
179 struct ns2_led_modval *modval;
180 enum ns2_led_modes mode;
181 int nmodes, ret;
182
183 led->cmd = devm_fwnode_gpiod_get_index(dev, node, "cmd", 0, GPIOD_ASIS,
184 fwnode_get_name(node));
185 if (IS_ERR(led->cmd))
186 return PTR_ERR(led->cmd);
187
188 led->slow = devm_fwnode_gpiod_get_index(dev, node, "slow", 0,
189 GPIOD_ASIS,
190 fwnode_get_name(node));
191 if (IS_ERR(led->slow))
192 return PTR_ERR(led->slow);
193
194 ret = fwnode_property_count_u32(node, "modes-map");
195 if (ret < 0 || ret % 3) {
196 dev_err(dev, "Missing or malformed modes-map for %pfw\n", node);
197 return -EINVAL;
198 }
199
200 nmodes = ret / 3;
201 modval = devm_kcalloc(dev, nmodes, sizeof(*modval), GFP_KERNEL);
202 if (!modval)
203 return -ENOMEM;
204
205 fwnode_property_read_u32_array(node, "modes-map", (void *)modval,
206 nmodes * 3);
207
208 rwlock_init(&led->rw_lock);
209
210 led->cdev.blink_set = NULL;
211 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
212 led->cdev.groups = ns2_led_groups;
213 led->can_sleep = gpiod_cansleep(led->cmd) || gpiod_cansleep(led->slow);
214 if (led->can_sleep)
215 led->cdev.brightness_set_blocking = ns2_led_set_blocking;
216 else
217 led->cdev.brightness_set = ns2_led_set;
218 led->num_modes = nmodes;
219 led->modval = modval;
220
221 ret = ns2_led_get_mode(led, &mode);
222 if (ret < 0)
223 return ret;
224
225 /* Set LED initial state. */
226 led->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
227 led->cdev.brightness = (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
228
229 init_data.fwnode = node;
230
231 ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
232 if (ret)
233 dev_err(dev, "Failed to register LED for node %pfw\n", node);
234
235 return ret;
236}
237
238static int ns2_led_probe(struct platform_device *pdev)
239{
240 struct device *dev = &pdev->dev;
241 struct fwnode_handle *child;
242 struct ns2_led *leds;
243 int count;
244 int ret;
245
246 count = device_get_child_node_count(dev);
247 if (!count)
248 return -ENODEV;
249
250 leds = devm_kzalloc(dev, array_size(sizeof(*leds), count), GFP_KERNEL);
251 if (!leds)
252 return -ENOMEM;
253
254 device_for_each_child_node(dev, child) {
255 ret = ns2_led_register(dev, child, leds++);
256 if (ret) {
257 fwnode_handle_put(child);
258 return ret;
259 }
260 }
261
262 return 0;
263}
264
265static const struct of_device_id of_ns2_leds_match[] = {
266 { .compatible = "lacie,ns2-leds", },
267 {},
268};
269MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
270
271static struct platform_driver ns2_led_driver = {
272 .probe = ns2_led_probe,
273 .driver = {
274 .name = "leds-ns2",
275 .of_match_table = of_ns2_leds_match,
276 },
277};
278
279module_platform_driver(ns2_led_driver);
280
281MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
282MODULE_DESCRIPTION("Network Space v2 LED driver");
283MODULE_LICENSE("GPL");
284MODULE_ALIAS("platform:leds-ns2");
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/platform_device.h>
27#include <linux/slab.h>
28#include <linux/gpio.h>
29#include <linux/leds.h>
30#include <linux/module.h>
31#include <linux/platform_data/leds-kirkwood-ns2.h>
32#include <linux/of.h>
33#include <linux/of_gpio.h>
34#include "leds.h"
35
36/*
37 * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
38 * modes are available: off, on and SATA activity blinking. The LED modes are
39 * controlled through two GPIOs (command and slow): each combination of values
40 * for the command/slow GPIOs corresponds to a LED mode.
41 */
42
43struct ns2_led_data {
44 struct led_classdev cdev;
45 unsigned cmd;
46 unsigned slow;
47 bool can_sleep;
48 unsigned char sata; /* True when SATA mode active. */
49 rwlock_t rw_lock; /* Lock GPIOs. */
50 int num_modes;
51 struct ns2_led_modval *modval;
52};
53
54static int ns2_led_get_mode(struct ns2_led_data *led_dat,
55 enum ns2_led_modes *mode)
56{
57 int i;
58 int ret = -EINVAL;
59 int cmd_level;
60 int slow_level;
61
62 cmd_level = gpio_get_value_cansleep(led_dat->cmd);
63 slow_level = gpio_get_value_cansleep(led_dat->slow);
64
65 for (i = 0; i < led_dat->num_modes; i++) {
66 if (cmd_level == led_dat->modval[i].cmd_level &&
67 slow_level == led_dat->modval[i].slow_level) {
68 *mode = led_dat->modval[i].mode;
69 ret = 0;
70 break;
71 }
72 }
73
74 return ret;
75}
76
77static void ns2_led_set_mode(struct ns2_led_data *led_dat,
78 enum ns2_led_modes mode)
79{
80 int i;
81 bool found = false;
82 unsigned long flags;
83
84 for (i = 0; i < led_dat->num_modes; i++)
85 if (mode == led_dat->modval[i].mode) {
86 found = true;
87 break;
88 }
89
90 if (!found)
91 return;
92
93 write_lock_irqsave(&led_dat->rw_lock, flags);
94
95 if (!led_dat->can_sleep) {
96 gpio_set_value(led_dat->cmd,
97 led_dat->modval[i].cmd_level);
98 gpio_set_value(led_dat->slow,
99 led_dat->modval[i].slow_level);
100 goto exit_unlock;
101 }
102
103 gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
104 gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
105
106exit_unlock:
107 write_unlock_irqrestore(&led_dat->rw_lock, flags);
108}
109
110static void ns2_led_set(struct led_classdev *led_cdev,
111 enum led_brightness value)
112{
113 struct ns2_led_data *led_dat =
114 container_of(led_cdev, struct ns2_led_data, cdev);
115 enum ns2_led_modes mode;
116
117 if (value == LED_OFF)
118 mode = NS_V2_LED_OFF;
119 else if (led_dat->sata)
120 mode = NS_V2_LED_SATA;
121 else
122 mode = NS_V2_LED_ON;
123
124 ns2_led_set_mode(led_dat, mode);
125}
126
127static int ns2_led_set_blocking(struct led_classdev *led_cdev,
128 enum led_brightness value)
129{
130 ns2_led_set(led_cdev, value);
131 return 0;
132}
133
134static ssize_t ns2_led_sata_store(struct device *dev,
135 struct device_attribute *attr,
136 const char *buff, size_t count)
137{
138 struct led_classdev *led_cdev = dev_get_drvdata(dev);
139 struct ns2_led_data *led_dat =
140 container_of(led_cdev, struct ns2_led_data, cdev);
141 int ret;
142 unsigned long enable;
143
144 ret = kstrtoul(buff, 10, &enable);
145 if (ret < 0)
146 return ret;
147
148 enable = !!enable;
149
150 if (led_dat->sata == enable)
151 goto exit;
152
153 led_dat->sata = enable;
154
155 if (!led_get_brightness(led_cdev))
156 goto exit;
157
158 if (enable)
159 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
160 else
161 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
162
163exit:
164 return count;
165}
166
167static ssize_t ns2_led_sata_show(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct led_classdev *led_cdev = dev_get_drvdata(dev);
171 struct ns2_led_data *led_dat =
172 container_of(led_cdev, struct ns2_led_data, cdev);
173
174 return sprintf(buf, "%d\n", led_dat->sata);
175}
176
177static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
178
179static struct attribute *ns2_led_attrs[] = {
180 &dev_attr_sata.attr,
181 NULL
182};
183ATTRIBUTE_GROUPS(ns2_led);
184
185static int
186create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
187 const struct ns2_led *template)
188{
189 int ret;
190 enum ns2_led_modes mode;
191
192 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
193 gpio_get_value_cansleep(template->cmd) ?
194 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
195 template->name);
196 if (ret) {
197 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
198 template->name);
199 return ret;
200 }
201
202 ret = devm_gpio_request_one(&pdev->dev, template->slow,
203 gpio_get_value_cansleep(template->slow) ?
204 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
205 template->name);
206 if (ret) {
207 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
208 template->name);
209 return ret;
210 }
211
212 rwlock_init(&led_dat->rw_lock);
213
214 led_dat->cdev.name = template->name;
215 led_dat->cdev.default_trigger = template->default_trigger;
216 led_dat->cdev.blink_set = NULL;
217 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
218 led_dat->cdev.groups = ns2_led_groups;
219 led_dat->cmd = template->cmd;
220 led_dat->slow = template->slow;
221 led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
222 gpio_cansleep(led_dat->slow);
223 if (led_dat->can_sleep)
224 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
225 else
226 led_dat->cdev.brightness_set = ns2_led_set;
227 led_dat->modval = template->modval;
228 led_dat->num_modes = template->num_modes;
229
230 ret = ns2_led_get_mode(led_dat, &mode);
231 if (ret < 0)
232 return ret;
233
234 /* Set LED initial state. */
235 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
236 led_dat->cdev.brightness =
237 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
238
239 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
240 if (ret < 0)
241 return ret;
242
243 return 0;
244}
245
246static void delete_ns2_led(struct ns2_led_data *led_dat)
247{
248 led_classdev_unregister(&led_dat->cdev);
249}
250
251#ifdef CONFIG_OF_GPIO
252/*
253 * Translate OpenFirmware node properties into platform_data.
254 */
255static int
256ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
257{
258 struct device_node *np = dev->of_node;
259 struct device_node *child;
260 struct ns2_led *led, *leds;
261 int num_leds = 0;
262
263 num_leds = of_get_child_count(np);
264 if (!num_leds)
265 return -ENODEV;
266
267 leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
268 GFP_KERNEL);
269 if (!leds)
270 return -ENOMEM;
271
272 led = leds;
273 for_each_child_of_node(np, child) {
274 const char *string;
275 int ret, i, num_modes;
276 struct ns2_led_modval *modval;
277
278 ret = of_get_named_gpio(child, "cmd-gpio", 0);
279 if (ret < 0)
280 return ret;
281 led->cmd = ret;
282 ret = of_get_named_gpio(child, "slow-gpio", 0);
283 if (ret < 0)
284 return ret;
285 led->slow = ret;
286 ret = of_property_read_string(child, "label", &string);
287 led->name = (ret == 0) ? string : child->name;
288 ret = of_property_read_string(child, "linux,default-trigger",
289 &string);
290 if (ret == 0)
291 led->default_trigger = string;
292
293 ret = of_property_count_u32_elems(child, "modes-map");
294 if (ret < 0 || ret % 3) {
295 dev_err(dev,
296 "Missing or malformed modes-map property\n");
297 return -EINVAL;
298 }
299
300 num_modes = ret / 3;
301 modval = devm_kzalloc(dev,
302 num_modes * sizeof(struct ns2_led_modval),
303 GFP_KERNEL);
304 if (!modval)
305 return -ENOMEM;
306
307 for (i = 0; i < num_modes; i++) {
308 of_property_read_u32_index(child,
309 "modes-map", 3 * i,
310 (u32 *) &modval[i].mode);
311 of_property_read_u32_index(child,
312 "modes-map", 3 * i + 1,
313 (u32 *) &modval[i].cmd_level);
314 of_property_read_u32_index(child,
315 "modes-map", 3 * i + 2,
316 (u32 *) &modval[i].slow_level);
317 }
318
319 led->num_modes = num_modes;
320 led->modval = modval;
321
322 led++;
323 }
324
325 pdata->leds = leds;
326 pdata->num_leds = num_leds;
327
328 return 0;
329}
330
331static const struct of_device_id of_ns2_leds_match[] = {
332 { .compatible = "lacie,ns2-leds", },
333 {},
334};
335MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
336#endif /* CONFIG_OF_GPIO */
337
338struct ns2_led_priv {
339 int num_leds;
340 struct ns2_led_data leds_data[];
341};
342
343static inline int sizeof_ns2_led_priv(int num_leds)
344{
345 return sizeof(struct ns2_led_priv) +
346 (sizeof(struct ns2_led_data) * num_leds);
347}
348
349static int ns2_led_probe(struct platform_device *pdev)
350{
351 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
352 struct ns2_led_priv *priv;
353 int i;
354 int ret;
355
356#ifdef CONFIG_OF_GPIO
357 if (!pdata) {
358 pdata = devm_kzalloc(&pdev->dev,
359 sizeof(struct ns2_led_platform_data),
360 GFP_KERNEL);
361 if (!pdata)
362 return -ENOMEM;
363
364 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
365 if (ret)
366 return ret;
367 }
368#else
369 if (!pdata)
370 return -EINVAL;
371#endif /* CONFIG_OF_GPIO */
372
373 priv = devm_kzalloc(&pdev->dev,
374 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
375 if (!priv)
376 return -ENOMEM;
377 priv->num_leds = pdata->num_leds;
378
379 for (i = 0; i < priv->num_leds; i++) {
380 ret = create_ns2_led(pdev, &priv->leds_data[i],
381 &pdata->leds[i]);
382 if (ret < 0) {
383 for (i = i - 1; i >= 0; i--)
384 delete_ns2_led(&priv->leds_data[i]);
385 return ret;
386 }
387 }
388
389 platform_set_drvdata(pdev, priv);
390
391 return 0;
392}
393
394static int ns2_led_remove(struct platform_device *pdev)
395{
396 int i;
397 struct ns2_led_priv *priv;
398
399 priv = platform_get_drvdata(pdev);
400
401 for (i = 0; i < priv->num_leds; i++)
402 delete_ns2_led(&priv->leds_data[i]);
403
404 return 0;
405}
406
407static struct platform_driver ns2_led_driver = {
408 .probe = ns2_led_probe,
409 .remove = ns2_led_remove,
410 .driver = {
411 .name = "leds-ns2",
412 .of_match_table = of_match_ptr(of_ns2_leds_match),
413 },
414};
415
416module_platform_driver(ns2_led_driver);
417
418MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
419MODULE_DESCRIPTION("Network Space v2 LED driver");
420MODULE_LICENSE("GPL");
421MODULE_ALIAS("platform:leds-ns2");