1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * PowerNV LED Driver
20 /* Map LED type to description. */
29 	{-1,				NULL},
35 	 * platform we want to retain LED state across reboot as these
42 	/* Max supported LED type */
49 /* PowerNV LED data */
52 	char			*loc_code;	/* LED location code */
59 /* Returns OPAL_SLOT_LED_TYPE_* for given led type string */
68 	return -1;  in powernv_get_led_type()
72  * This commits the state change of the requested LED through an OPAL call.
83 	struct device *dev = powernv_led->cdev.dev;  in powernv_led_set()
84 	struct powernv_led_common *powernv_led_common = powernv_led->common;  in powernv_led_set()
87 	max_type = powernv_led_common->max_led_type;  in powernv_led_set()
88 	led_mask = OPAL_SLOT_LED_STATE_ON << powernv_led->led_type;  in powernv_led_set()
95 		if (token != -ERESTARTSYS)  in powernv_led_set()
96 			dev_err(dev, "%s: Couldn't get OPAL async token\n",  in powernv_led_set()
101 	rc = opal_leds_set_ind(token, powernv_led->loc_code,  in powernv_led_set()
104 		dev_err(dev, "%s: OPAL set LED call failed for %s [rc=%d]\n",  in powernv_led_set()
105 			__func__, powernv_led->loc_code, rc);  in powernv_led_set()
112 			"%s: Failed to wait for the async response [rc=%d]\n",  in powernv_led_set()
119 		dev_err(dev, "%s : OAPL async call returned failed [rc=%d]\n",  in powernv_led_set()
128  * This function fetches the LED state for a given LED type for
129  * mentioned LED classdev structure.
136 	struct device *dev = powernv_led->cdev.dev;  in powernv_led_get()
137 	struct powernv_led_common *powernv_led_common = powernv_led->common;  in powernv_led_get()
139 	/* Fetch all LED status */  in powernv_led_get()
142 	max_type = powernv_led_common->max_led_type;  in powernv_led_get()
144 	rc = opal_leds_get_ind(powernv_led->loc_code,  in powernv_led_get()
147 		dev_err(dev, "%s: OPAL get led call failed [rc=%d]\n",  in powernv_led_get()
155 	/* LED status available */  in powernv_led_get()
156 	if (!((led_mask >> powernv_led->led_type) & OPAL_SLOT_LED_STATE_ON)) {  in powernv_led_get()
157 		dev_err(dev, "%s: LED status not available for %s\n",  in powernv_led_get()
158 			__func__, powernv_led->cdev.name);  in powernv_led_get()
162 	/* LED status value */  in powernv_led_get()
163 	if ((led_value >> powernv_led->led_type) & OPAL_SLOT_LED_STATE_ON)  in powernv_led_get()
170  * LED classdev 'brightness_get' function. This schedules work
171  * to update LED state.
178 	struct powernv_led_common *powernv_led_common = powernv_led->common;  in powernv_brightness_set()
181 	/* Do not modify LED in unload path */  in powernv_brightness_set()
182 	if (powernv_led_common->led_disabled)  in powernv_brightness_set()
185 	mutex_lock(&powernv_led_common->lock);  in powernv_brightness_set()
187 	mutex_unlock(&powernv_led_common->lock);  in powernv_brightness_set()
192 /* LED classdev 'brightness_get' function */
202  * This function registers classdev structure for any given type of LED on
203  * a given child LED device node.
211 	/* Make sure LED type is supported */  in powernv_led_create()
212 	powernv_led->led_type = powernv_get_led_type(led_type_desc);  in powernv_led_create()
213 	if (powernv_led->led_type == -1) {  in powernv_led_create()
214 		dev_warn(dev, "%s: No support for led type : %s\n",  in powernv_led_create()
216 		return -EINVAL;  in powernv_led_create()
220 	powernv_led->cdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s",  in powernv_led_create()
221 						powernv_led->loc_code,  in powernv_led_create()
223 	if (!powernv_led->cdev.name)  in powernv_led_create()
224 		return -ENOMEM;  in powernv_led_create()
226 	powernv_led->cdev.brightness_set_blocking = powernv_brightness_set;  in powernv_led_create()
227 	powernv_led->cdev.brightness_get = powernv_brightness_get;  in powernv_led_create()
228 	powernv_led->cdev.brightness = LED_OFF;  in powernv_led_create()
229 	powernv_led->cdev.max_brightness = LED_FULL;  in powernv_led_create()
232 	rc = devm_led_classdev_register(dev, &powernv_led->cdev);  in powernv_led_create()
234 		dev_err(dev, "%s: Classdev registration failed for %s\n",  in powernv_led_create()
235 			__func__, powernv_led->cdev.name);  in powernv_led_create()
241 /* Go through LED device tree node and register LED classdev structure */
247 	int rc = -1;  in powernv_led_classdev()
250 	struct device *dev = &pdev->dev;  in powernv_led_classdev()
253 		p = of_find_property(np, "led-types", NULL);  in powernv_led_classdev()
259 				return -ENOMEM;  in powernv_led_classdev()
261 			powernv_led->common = powernv_led_common;  in powernv_led_classdev()
262 			powernv_led->loc_code = (char *)np->name;  in powernv_led_classdev()
278 	struct device *dev = &pdev->dev;  in powernv_led_probe()
283 		dev_err(dev, "%s: LED parent device node not found\n",  in powernv_led_probe()
285 		return -EINVAL;  in powernv_led_probe()
291 		return -ENOMEM;  in powernv_led_probe()
293 	mutex_init(&powernv_led_common->lock);  in powernv_led_probe()
294 	powernv_led_common->max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);  in powernv_led_probe()
306 	/* Disable LED operation */  in powernv_led_remove()
308 	powernv_led_common->led_disabled = true;  in powernv_led_remove()
311 	mutex_destroy(&powernv_led_common->lock);  in powernv_led_remove()
313 	dev_info(&pdev->dev, "PowerNV led module unregistered\n");  in powernv_led_remove()
319 		.compatible	= "ibm,opal-v3-led",
329 		.name = "powernv-led-driver",
337 MODULE_DESCRIPTION("PowerNV LED driver");