1 /*
2 * drivers/leds/leds-mlxcpld.c
3 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the names of the copyright holders nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <linux/acpi.h>
36 #include <linux/device.h>
37 #include <linux/dmi.h>
38 #include <linux/hwmon.h>
39 #include <linux/hwmon-sysfs.h>
40 #include <linux/io.h>
41 #include <linux/leds.h>
42 #include <linux/module.h>
43 #include <linux/mod_devicetable.h>
44 #include <linux/platform_device.h>
45 #include <linux/slab.h>
46
47 #define MLXPLAT_CPLD_LPC_REG_BASE_ADRR 0x2500 /* LPC bus access */
48
49 /* Color codes for LEDs */
50 #define MLXCPLD_LED_OFFSET_HALF 0x01 /* Offset from solid: 3Hz blink */
51 #define MLXCPLD_LED_OFFSET_FULL 0x02 /* Offset from solid: 6Hz blink */
52 #define MLXCPLD_LED_IS_OFF 0x00 /* Off */
53 #define MLXCPLD_LED_RED_STATIC_ON 0x05 /* Solid red */
54 #define MLXCPLD_LED_RED_BLINK_HALF (MLXCPLD_LED_RED_STATIC_ON + \
55 MLXCPLD_LED_OFFSET_HALF)
56 #define MLXCPLD_LED_RED_BLINK_FULL (MLXCPLD_LED_RED_STATIC_ON + \
57 MLXCPLD_LED_OFFSET_FULL)
58 #define MLXCPLD_LED_GREEN_STATIC_ON 0x0D /* Solid green */
59 #define MLXCPLD_LED_GREEN_BLINK_HALF (MLXCPLD_LED_GREEN_STATIC_ON + \
60 MLXCPLD_LED_OFFSET_HALF)
61 #define MLXCPLD_LED_GREEN_BLINK_FULL (MLXCPLD_LED_GREEN_STATIC_ON + \
62 MLXCPLD_LED_OFFSET_FULL)
63 #define MLXCPLD_LED_BLINK_3HZ 167 /* ~167 msec off/on */
64 #define MLXCPLD_LED_BLINK_6HZ 83 /* ~83 msec off/on */
65
66 /**
67 * struct mlxcpld_param - LED access parameters:
68 * @offset: offset for LED access in CPLD device
69 * @mask: mask for LED access in CPLD device
70 * @base_color: base color code for LED
71 **/
72 struct mlxcpld_param {
73 u8 offset;
74 u8 mask;
75 u8 base_color;
76 };
77
78 /**
79 * struct mlxcpld_led_priv - LED private data:
80 * @cdev: LED class device instance
81 * @param: LED CPLD access parameters
82 **/
83 struct mlxcpld_led_priv {
84 struct led_classdev cdev;
85 struct mlxcpld_param param;
86 };
87
88 #define cdev_to_priv(c) container_of(c, struct mlxcpld_led_priv, cdev)
89
90 /**
91 * struct mlxcpld_led_profile - system LED profile (defined per system class):
92 * @offset: offset for LED access in CPLD device
93 * @mask: mask for LED access in CPLD device
94 * @base_color: base color code
95 * @brightness: default brightness setting (on/off)
96 * @name: LED name
97 **/
98 struct mlxcpld_led_profile {
99 u8 offset;
100 u8 mask;
101 u8 base_color;
102 enum led_brightness brightness;
103 const char *name;
104 };
105
106 /**
107 * struct mlxcpld_led_pdata - system LED private data
108 * @pdev: platform device pointer
109 * @pled: LED class device instance
110 * @profile: system configuration profile
111 * @num_led_instances: number of LED instances
112 * @lock: device access lock
113 **/
114 struct mlxcpld_led_pdata {
115 struct platform_device *pdev;
116 struct mlxcpld_led_priv *pled;
117 struct mlxcpld_led_profile *profile;
118 int num_led_instances;
119 spinlock_t lock;
120 };
121
122 static struct mlxcpld_led_pdata *mlxcpld_led;
123
124 /* Default profile fit the next Mellanox systems:
125 * "msx6710", "msx6720", "msb7700", "msn2700", "msx1410",
126 * "msn2410", "msb7800", "msn2740"
127 */
128 static struct mlxcpld_led_profile mlxcpld_led_default_profile[] = {
129 {
130 0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
131 "mlxcpld:fan1:green",
132 },
133 {
134 0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
135 "mlxcpld:fan1:red",
136 },
137 {
138 0x21, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
139 "mlxcpld:fan2:green",
140 },
141 {
142 0x21, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
143 "mlxcpld:fan2:red",
144 },
145 {
146 0x22, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
147 "mlxcpld:fan3:green",
148 },
149 {
150 0x22, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
151 "mlxcpld:fan3:red",
152 },
153 {
154 0x22, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
155 "mlxcpld:fan4:green",
156 },
157 {
158 0x22, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
159 "mlxcpld:fan4:red",
160 },
161 {
162 0x20, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
163 "mlxcpld:psu:green",
164 },
165 {
166 0x20, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
167 "mlxcpld:psu:red",
168 },
169 {
170 0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
171 "mlxcpld:status:green",
172 },
173 {
174 0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
175 "mlxcpld:status:red",
176 },
177 };
178
179 /* Profile fit the Mellanox systems based on "msn2100" */
180 static struct mlxcpld_led_profile mlxcpld_led_msn2100_profile[] = {
181 {
182 0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
183 "mlxcpld:fan:green",
184 },
185 {
186 0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
187 "mlxcpld:fan:red",
188 },
189 {
190 0x23, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
191 "mlxcpld:psu1:green",
192 },
193 {
194 0x23, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
195 "mlxcpld:psu1:red",
196 },
197 {
198 0x23, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
199 "mlxcpld:psu2:green",
200 },
201 {
202 0x23, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
203 "mlxcpld:psu2:red",
204 },
205 {
206 0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
207 "mlxcpld:status:green",
208 },
209 {
210 0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
211 "mlxcpld:status:red",
212 },
213 {
214 0x24, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, LED_OFF,
215 "mlxcpld:uid:blue",
216 },
217 };
218
219 enum mlxcpld_led_platform_types {
220 MLXCPLD_LED_PLATFORM_DEFAULT,
221 MLXCPLD_LED_PLATFORM_MSN2100,
222 };
223
224 static const char *mlx_product_names[] = {
225 "DEFAULT",
226 "MSN2100",
227 };
228
229 static enum
mlxcpld_led_platform_check_sys_type(void)230 mlxcpld_led_platform_types mlxcpld_led_platform_check_sys_type(void)
231 {
232 const char *mlx_product_name;
233 int i;
234
235 mlx_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
236 if (!mlx_product_name)
237 return MLXCPLD_LED_PLATFORM_DEFAULT;
238
239 for (i = 1; i < ARRAY_SIZE(mlx_product_names); i++) {
240 if (strstr(mlx_product_name, mlx_product_names[i]))
241 return i;
242 }
243
244 return MLXCPLD_LED_PLATFORM_DEFAULT;
245 }
246
mlxcpld_led_bus_access_func(u16 base,u8 offset,u8 rw_flag,u8 * data)247 static void mlxcpld_led_bus_access_func(u16 base, u8 offset, u8 rw_flag,
248 u8 *data)
249 {
250 u32 addr = base + offset;
251
252 if (rw_flag == 0)
253 outb(*data, addr);
254 else
255 *data = inb(addr);
256 }
257
mlxcpld_led_store_hw(u8 mask,u8 off,u8 vset)258 static void mlxcpld_led_store_hw(u8 mask, u8 off, u8 vset)
259 {
260 u8 nib, val;
261
262 /*
263 * Each LED is controlled through low or high nibble of the relevant
264 * CPLD register. Register offset is specified by off parameter.
265 * Parameter vset provides color code: 0x0 for off, 0x5 for solid red,
266 * 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink
267 * green.
268 * Parameter mask specifies which nibble is used for specific LED: mask
269 * 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -
270 * higher nibble (bits from 4 to 7).
271 */
272 spin_lock(&mlxcpld_led->lock);
273 mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 1,
274 &val);
275 nib = (mask == 0xf0) ? vset : (vset << 4);
276 val = (val & mask) | nib;
277 mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 0,
278 &val);
279 spin_unlock(&mlxcpld_led->lock);
280 }
281
mlxcpld_led_brightness_set(struct led_classdev * led,enum led_brightness value)282 static void mlxcpld_led_brightness_set(struct led_classdev *led,
283 enum led_brightness value)
284 {
285 struct mlxcpld_led_priv *pled = cdev_to_priv(led);
286
287 if (value) {
288 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
289 pled->param.base_color);
290 return;
291 }
292
293 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
294 MLXCPLD_LED_IS_OFF);
295 }
296
mlxcpld_led_blink_set(struct led_classdev * led,unsigned long * delay_on,unsigned long * delay_off)297 static int mlxcpld_led_blink_set(struct led_classdev *led,
298 unsigned long *delay_on,
299 unsigned long *delay_off)
300 {
301 struct mlxcpld_led_priv *pled = cdev_to_priv(led);
302
303 /*
304 * HW supports two types of blinking: full (6Hz) and half (3Hz).
305 * For delay on/off zero default setting 3Hz is used.
306 */
307 if (!(*delay_on == 0 && *delay_off == 0) &&
308 !(*delay_on == MLXCPLD_LED_BLINK_3HZ &&
309 *delay_off == MLXCPLD_LED_BLINK_3HZ) &&
310 !(*delay_on == MLXCPLD_LED_BLINK_6HZ &&
311 *delay_off == MLXCPLD_LED_BLINK_6HZ))
312 return -EINVAL;
313
314 if (*delay_on == MLXCPLD_LED_BLINK_6HZ)
315 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
316 pled->param.base_color +
317 MLXCPLD_LED_OFFSET_FULL);
318 else
319 mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
320 pled->param.base_color +
321 MLXCPLD_LED_OFFSET_HALF);
322
323 return 0;
324 }
325
mlxcpld_led_config(struct device * dev,struct mlxcpld_led_pdata * cpld)326 static int mlxcpld_led_config(struct device *dev,
327 struct mlxcpld_led_pdata *cpld)
328 {
329 int i;
330 int err;
331
332 cpld->pled = devm_kcalloc(dev,
333 cpld->num_led_instances,
334 sizeof(struct mlxcpld_led_priv),
335 GFP_KERNEL);
336 if (!cpld->pled)
337 return -ENOMEM;
338
339 for (i = 0; i < cpld->num_led_instances; i++) {
340 cpld->pled[i].cdev.name = cpld->profile[i].name;
341 cpld->pled[i].cdev.brightness = cpld->profile[i].brightness;
342 cpld->pled[i].cdev.max_brightness = 1;
343 cpld->pled[i].cdev.brightness_set = mlxcpld_led_brightness_set;
344 cpld->pled[i].cdev.blink_set = mlxcpld_led_blink_set;
345 cpld->pled[i].cdev.flags = LED_CORE_SUSPENDRESUME;
346 err = devm_led_classdev_register(dev, &cpld->pled[i].cdev);
347 if (err)
348 return err;
349
350 cpld->pled[i].param.offset = mlxcpld_led->profile[i].offset;
351 cpld->pled[i].param.mask = mlxcpld_led->profile[i].mask;
352 cpld->pled[i].param.base_color =
353 mlxcpld_led->profile[i].base_color;
354
355 if (mlxcpld_led->profile[i].brightness)
356 mlxcpld_led_brightness_set(&cpld->pled[i].cdev,
357 mlxcpld_led->profile[i].brightness);
358 }
359
360 return 0;
361 }
362
mlxcpld_led_probe(struct platform_device * pdev)363 static int __init mlxcpld_led_probe(struct platform_device *pdev)
364 {
365 enum mlxcpld_led_platform_types mlxcpld_led_plat =
366 mlxcpld_led_platform_check_sys_type();
367
368 mlxcpld_led = devm_kzalloc(&pdev->dev, sizeof(*mlxcpld_led),
369 GFP_KERNEL);
370 if (!mlxcpld_led)
371 return -ENOMEM;
372
373 mlxcpld_led->pdev = pdev;
374
375 switch (mlxcpld_led_plat) {
376 case MLXCPLD_LED_PLATFORM_MSN2100:
377 mlxcpld_led->profile = mlxcpld_led_msn2100_profile;
378 mlxcpld_led->num_led_instances =
379 ARRAY_SIZE(mlxcpld_led_msn2100_profile);
380 break;
381
382 default:
383 mlxcpld_led->profile = mlxcpld_led_default_profile;
384 mlxcpld_led->num_led_instances =
385 ARRAY_SIZE(mlxcpld_led_default_profile);
386 break;
387 }
388
389 spin_lock_init(&mlxcpld_led->lock);
390
391 return mlxcpld_led_config(&pdev->dev, mlxcpld_led);
392 }
393
394 static struct platform_driver mlxcpld_led_driver = {
395 .driver = {
396 .name = KBUILD_MODNAME,
397 },
398 };
399
mlxcpld_led_init(void)400 static int __init mlxcpld_led_init(void)
401 {
402 struct platform_device *pdev;
403 int err;
404
405 if (!dmi_match(DMI_CHASSIS_VENDOR, "Mellanox Technologies Ltd."))
406 return -ENODEV;
407
408 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
409 if (IS_ERR(pdev)) {
410 pr_err("Device allocation failed\n");
411 return PTR_ERR(pdev);
412 }
413
414 err = platform_driver_probe(&mlxcpld_led_driver, mlxcpld_led_probe);
415 if (err) {
416 pr_err("Probe platform driver failed\n");
417 platform_device_unregister(pdev);
418 }
419
420 return err;
421 }
422
mlxcpld_led_exit(void)423 static void __exit mlxcpld_led_exit(void)
424 {
425 platform_device_unregister(mlxcpld_led->pdev);
426 platform_driver_unregister(&mlxcpld_led_driver);
427 }
428
429 module_init(mlxcpld_led_init);
430 module_exit(mlxcpld_led_exit);
431
432 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
433 MODULE_DESCRIPTION("Mellanox board LED driver");
434 MODULE_LICENSE("Dual BSD/GPL");
435 MODULE_ALIAS("platform:leds_mlxcpld");
436