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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 <linux/module.h>
32#include <linux/platform_data/leds-kirkwood-ns2.h>
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50enum ns2_led_modes {
51 NS_V2_LED_OFF,
52 NS_V2_LED_ON,
53 NS_V2_LED_SATA,
54};
55
56struct ns2_led_mode_value {
57 enum ns2_led_modes mode;
58 int cmd_level;
59 int slow_level;
60};
61
62static struct ns2_led_mode_value ns2_led_modval[] = {
63 { NS_V2_LED_OFF , 1, 0 },
64 { NS_V2_LED_ON , 0, 1 },
65 { NS_V2_LED_ON , 1, 1 },
66 { NS_V2_LED_SATA, 0, 0 },
67};
68
69struct ns2_led_data {
70 struct led_classdev cdev;
71 unsigned cmd;
72 unsigned slow;
73 unsigned char sata;
74 rwlock_t rw_lock;
75};
76
77static int ns2_led_get_mode(struct ns2_led_data *led_dat,
78 enum ns2_led_modes *mode)
79{
80 int i;
81 int ret = -EINVAL;
82 int cmd_level;
83 int slow_level;
84
85 read_lock_irq(&led_dat->rw_lock);
86
87 cmd_level = gpio_get_value(led_dat->cmd);
88 slow_level = gpio_get_value(led_dat->slow);
89
90 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
91 if (cmd_level == ns2_led_modval[i].cmd_level &&
92 slow_level == ns2_led_modval[i].slow_level) {
93 *mode = ns2_led_modval[i].mode;
94 ret = 0;
95 break;
96 }
97 }
98
99 read_unlock_irq(&led_dat->rw_lock);
100
101 return ret;
102}
103
104static void ns2_led_set_mode(struct ns2_led_data *led_dat,
105 enum ns2_led_modes mode)
106{
107 int i;
108 unsigned long flags;
109
110 write_lock_irqsave(&led_dat->rw_lock, flags);
111
112 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
113 if (mode == ns2_led_modval[i].mode) {
114 gpio_set_value(led_dat->cmd,
115 ns2_led_modval[i].cmd_level);
116 gpio_set_value(led_dat->slow,
117 ns2_led_modval[i].slow_level);
118 }
119 }
120
121 write_unlock_irqrestore(&led_dat->rw_lock, flags);
122}
123
124static void ns2_led_set(struct led_classdev *led_cdev,
125 enum led_brightness value)
126{
127 struct ns2_led_data *led_dat =
128 container_of(led_cdev, struct ns2_led_data, cdev);
129 enum ns2_led_modes mode;
130
131 if (value == LED_OFF)
132 mode = NS_V2_LED_OFF;
133 else if (led_dat->sata)
134 mode = NS_V2_LED_SATA;
135 else
136 mode = NS_V2_LED_ON;
137
138 ns2_led_set_mode(led_dat, mode);
139}
140
141static ssize_t ns2_led_sata_store(struct device *dev,
142 struct device_attribute *attr,
143 const char *buff, size_t count)
144{
145 struct led_classdev *led_cdev = dev_get_drvdata(dev);
146 struct ns2_led_data *led_dat =
147 container_of(led_cdev, struct ns2_led_data, cdev);
148 int ret;
149 unsigned long enable;
150 enum ns2_led_modes mode;
151
152 ret = strict_strtoul(buff, 10, &enable);
153 if (ret < 0)
154 return ret;
155
156 enable = !!enable;
157
158 if (led_dat->sata == enable)
159 return count;
160
161 ret = ns2_led_get_mode(led_dat, &mode);
162 if (ret < 0)
163 return ret;
164
165 if (enable && mode == NS_V2_LED_ON)
166 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
167 if (!enable && mode == NS_V2_LED_SATA)
168 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
169
170 led_dat->sata = enable;
171
172 return count;
173}
174
175static ssize_t ns2_led_sata_show(struct device *dev,
176 struct device_attribute *attr, char *buf)
177{
178 struct led_classdev *led_cdev = dev_get_drvdata(dev);
179 struct ns2_led_data *led_dat =
180 container_of(led_cdev, struct ns2_led_data, cdev);
181
182 return sprintf(buf, "%d\n", led_dat->sata);
183}
184
185static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
186
187static int __devinit
188create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
189 const struct ns2_led *template)
190{
191 int ret;
192 enum ns2_led_modes mode;
193
194 ret = gpio_request(template->cmd, template->name);
195 if (ret == 0) {
196 ret = gpio_direction_output(template->cmd,
197 gpio_get_value(template->cmd));
198 if (ret)
199 gpio_free(template->cmd);
200 }
201 if (ret) {
202 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
203 template->name);
204 }
205
206 ret = gpio_request(template->slow, template->name);
207 if (ret == 0) {
208 ret = gpio_direction_output(template->slow,
209 gpio_get_value(template->slow));
210 if (ret)
211 gpio_free(template->slow);
212 }
213 if (ret) {
214 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
215 template->name);
216 goto err_free_cmd;
217 }
218
219 rwlock_init(&led_dat->rw_lock);
220
221 led_dat->cdev.name = template->name;
222 led_dat->cdev.default_trigger = template->default_trigger;
223 led_dat->cdev.blink_set = NULL;
224 led_dat->cdev.brightness_set = ns2_led_set;
225 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
226 led_dat->cmd = template->cmd;
227 led_dat->slow = template->slow;
228
229 ret = ns2_led_get_mode(led_dat, &mode);
230 if (ret < 0)
231 goto err_free_slow;
232
233
234 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
235 led_dat->cdev.brightness =
236 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
237
238 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
239 if (ret < 0)
240 goto err_free_slow;
241
242 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
243 if (ret < 0)
244 goto err_free_cdev;
245
246 return 0;
247
248err_free_cdev:
249 led_classdev_unregister(&led_dat->cdev);
250err_free_slow:
251 gpio_free(led_dat->slow);
252err_free_cmd:
253 gpio_free(led_dat->cmd);
254
255 return ret;
256}
257
258static void delete_ns2_led(struct ns2_led_data *led_dat)
259{
260 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
261 led_classdev_unregister(&led_dat->cdev);
262 gpio_free(led_dat->cmd);
263 gpio_free(led_dat->slow);
264}
265
266static int __devinit ns2_led_probe(struct platform_device *pdev)
267{
268 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
269 struct ns2_led_data *leds_data;
270 int i;
271 int ret;
272
273 if (!pdata)
274 return -EINVAL;
275
276 leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
277 pdata->num_leds, GFP_KERNEL);
278 if (!leds_data)
279 return -ENOMEM;
280
281 for (i = 0; i < pdata->num_leds; i++) {
282 ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
283 if (ret < 0) {
284 for (i = i - 1; i >= 0; i--)
285 delete_ns2_led(&leds_data[i]);
286 return ret;
287 }
288 }
289
290 platform_set_drvdata(pdev, leds_data);
291
292 return 0;
293}
294
295static int __devexit ns2_led_remove(struct platform_device *pdev)
296{
297 int i;
298 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
299 struct ns2_led_data *leds_data;
300
301 leds_data = platform_get_drvdata(pdev);
302
303 for (i = 0; i < pdata->num_leds; i++)
304 delete_ns2_led(&leds_data[i]);
305
306 platform_set_drvdata(pdev, NULL);
307
308 return 0;
309}
310
311static struct platform_driver ns2_led_driver = {
312 .probe = ns2_led_probe,
313 .remove = __devexit_p(ns2_led_remove),
314 .driver = {
315 .name = "leds-ns2",
316 .owner = THIS_MODULE,
317 },
318};
319
320module_platform_driver(ns2_led_driver);
321
322MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
323MODULE_DESCRIPTION("Network Space v2 LED driver");
324MODULE_LICENSE("GPL");
325MODULE_ALIAS("platform:leds-ns2");
326
