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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_kcalloc(dev, count, sizeof(*leds), 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/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");