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1/*
2 * drivers/leds/leds-apu.c
3 * Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the names of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36#include <linux/dmi.h>
37#include <linux/err.h>
38#include <linux/init.h>
39#include <linux/io.h>
40#include <linux/kernel.h>
41#include <linux/leds.h>
42#include <linux/module.h>
43#include <linux/platform_device.h>
44
45#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
46#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
47#define APU1_LEDON 0x08
48#define APU1_LEDOFF 0xC8
49#define APU1_NUM_GPIO 3
50#define APU1_IOSIZE sizeof(u8)
51
52/* LED access parameters */
53struct apu_param {
54 void __iomem *addr; /* for ioread/iowrite */
55};
56
57/* LED private data */
58struct apu_led_priv {
59 struct led_classdev cdev;
60 struct apu_param param;
61};
62#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)
63
64/* LED profile */
65struct apu_led_profile {
66 const char *name;
67 enum led_brightness brightness;
68 unsigned long offset; /* for devm_ioremap */
69};
70
71struct apu_led_pdata {
72 struct platform_device *pdev;
73 struct apu_led_priv *pled;
74 spinlock_t lock;
75};
76
77static struct apu_led_pdata *apu_led;
78
79static const struct apu_led_profile apu1_led_profile[] = {
80 { "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },
81 { "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },
82 { "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },
83};
84
85static const struct dmi_system_id apu_led_dmi_table[] __initconst = {
86 /* PC Engines APU with factory bios "SageBios_PCEngines_APU-45" */
87 {
88 .ident = "apu",
89 .matches = {
90 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
91 DMI_MATCH(DMI_PRODUCT_NAME, "APU")
92 }
93 },
94 /* PC Engines APU with "Mainline" bios >= 4.6.8 */
95 {
96 .ident = "apu",
97 .matches = {
98 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
99 DMI_MATCH(DMI_PRODUCT_NAME, "apu1")
100 }
101 },
102 {}
103};
104MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);
105
106static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)
107{
108 struct apu_led_priv *pled = cdev_to_priv(led);
109
110 spin_lock(&apu_led->lock);
111 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);
112 spin_unlock(&apu_led->lock);
113}
114
115static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
116{
117 int i;
118 int err;
119
120 apu_led->pled = devm_kcalloc(dev,
121 ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv),
122 GFP_KERNEL);
123
124 if (!apu_led->pled)
125 return -ENOMEM;
126
127 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) {
128 struct apu_led_priv *pled = &apu_led->pled[i];
129 struct led_classdev *led_cdev = &pled->cdev;
130
131 led_cdev->name = apu1_led_profile[i].name;
132 led_cdev->brightness = apu1_led_profile[i].brightness;
133 led_cdev->max_brightness = 1;
134 led_cdev->flags = LED_CORE_SUSPENDRESUME;
135 led_cdev->brightness_set = apu1_led_brightness_set;
136
137 pled->param.addr = devm_ioremap(dev,
138 apu1_led_profile[i].offset, APU1_IOSIZE);
139 if (!pled->param.addr) {
140 err = -ENOMEM;
141 goto error;
142 }
143
144 err = led_classdev_register(dev, led_cdev);
145 if (err)
146 goto error;
147
148 apu1_led_brightness_set(led_cdev, apu1_led_profile[i].brightness);
149 }
150
151 return 0;
152
153error:
154 while (i-- > 0)
155 led_classdev_unregister(&apu_led->pled[i].cdev);
156
157 return err;
158}
159
160static int __init apu_led_probe(struct platform_device *pdev)
161{
162 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);
163
164 if (!apu_led)
165 return -ENOMEM;
166
167 apu_led->pdev = pdev;
168
169 spin_lock_init(&apu_led->lock);
170 return apu_led_config(&pdev->dev, apu_led);
171}
172
173static struct platform_driver apu_led_driver = {
174 .driver = {
175 .name = KBUILD_MODNAME,
176 },
177};
178
179static int __init apu_led_init(void)
180{
181 struct platform_device *pdev;
182 int err;
183
184 if (!(dmi_match(DMI_SYS_VENDOR, "PC Engines") &&
185 (dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "apu1")))) {
186 pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n");
187 return -ENODEV;
188 }
189
190 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
191 if (IS_ERR(pdev)) {
192 pr_err("Device allocation failed\n");
193 return PTR_ERR(pdev);
194 }
195
196 err = platform_driver_probe(&apu_led_driver, apu_led_probe);
197 if (err) {
198 pr_err("Probe platform driver failed\n");
199 platform_device_unregister(pdev);
200 }
201
202 return err;
203}
204
205static void __exit apu_led_exit(void)
206{
207 int i;
208
209 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++)
210 led_classdev_unregister(&apu_led->pled[i].cdev);
211
212 platform_device_unregister(apu_led->pdev);
213 platform_driver_unregister(&apu_led_driver);
214}
215
216module_init(apu_led_init);
217module_exit(apu_led_exit);
218
219MODULE_AUTHOR("Alan Mizrahi");
220MODULE_DESCRIPTION("PC Engines APU1 front LED driver");
221MODULE_LICENSE("GPL v2");
222MODULE_ALIAS("platform:leds_apu");
1/*
2 * drivers/leds/leds-apu.c
3 * Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the names of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <linux/dmi.h>
35#include <linux/err.h>
36#include <linux/init.h>
37#include <linux/io.h>
38#include <linux/kernel.h>
39#include <linux/leds.h>
40#include <linux/module.h>
41#include <linux/platform_device.h>
42
43#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
44#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
45#define APU1_LEDON 0x08
46#define APU1_LEDOFF 0xC8
47#define APU1_NUM_GPIO 3
48#define APU1_IOSIZE sizeof(u8)
49
50#define APU2_FCH_ACPI_MMIO_BASE 0xFED80000
51#define APU2_FCH_GPIO_BASE (APU2_FCH_ACPI_MMIO_BASE + 0x1500)
52#define APU2_GPIO_BIT_WRITE 22
53#define APU2_APU2_NUM_GPIO 4
54#define APU2_IOSIZE sizeof(u32)
55
56/* LED access parameters */
57struct apu_param {
58 void __iomem *addr; /* for ioread/iowrite */
59};
60
61/* LED private data */
62struct apu_led_priv {
63 struct led_classdev cdev;
64 struct apu_param param;
65};
66#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)
67
68/* LED profile */
69struct apu_led_profile {
70 const char *name;
71 enum led_brightness brightness;
72 unsigned long offset; /* for devm_ioremap */
73};
74
75/* Supported platform types */
76enum apu_led_platform_types {
77 APU1_LED_PLATFORM,
78 APU2_LED_PLATFORM,
79};
80
81struct apu_led_pdata {
82 struct platform_device *pdev;
83 struct apu_led_priv *pled;
84 const struct apu_led_profile *profile;
85 enum apu_led_platform_types platform;
86 int num_led_instances;
87 int iosize; /* for devm_ioremap() */
88 spinlock_t lock;
89};
90
91static struct apu_led_pdata *apu_led;
92
93static const struct apu_led_profile apu1_led_profile[] = {
94 { "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },
95 { "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },
96 { "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },
97};
98
99static const struct apu_led_profile apu2_led_profile[] = {
100 { "apu2:green:1", LED_ON, APU2_FCH_GPIO_BASE + 68 * APU2_IOSIZE },
101 { "apu2:green:2", LED_OFF, APU2_FCH_GPIO_BASE + 69 * APU2_IOSIZE },
102 { "apu2:green:3", LED_OFF, APU2_FCH_GPIO_BASE + 70 * APU2_IOSIZE },
103};
104
105static const struct dmi_system_id apu_led_dmi_table[] __initconst = {
106 {
107 .ident = "apu",
108 .matches = {
109 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
110 DMI_MATCH(DMI_PRODUCT_NAME, "APU")
111 }
112 },
113 /* PC Engines APU2 with "Legacy" bios < 4.0.8 */
114 {
115 .ident = "apu2",
116 .matches = {
117 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
118 DMI_MATCH(DMI_BOARD_NAME, "APU2")
119 }
120 },
121 /* PC Engines APU2 with "Legacy" bios >= 4.0.8 */
122 {
123 .ident = "apu2",
124 .matches = {
125 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
126 DMI_MATCH(DMI_BOARD_NAME, "apu2")
127 }
128 },
129 /* PC Engines APU2 with "Mainline" bios */
130 {
131 .ident = "apu2",
132 .matches = {
133 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
134 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
135 }
136 },
137 {}
138};
139MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);
140
141static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)
142{
143 struct apu_led_priv *pled = cdev_to_priv(led);
144
145 spin_lock(&apu_led->lock);
146 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);
147 spin_unlock(&apu_led->lock);
148}
149
150static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value)
151{
152 struct apu_led_priv *pled = cdev_to_priv(led);
153 u32 value_new;
154
155 spin_lock(&apu_led->lock);
156
157 value_new = ioread32(pled->param.addr);
158
159 if (value)
160 value_new &= ~BIT(APU2_GPIO_BIT_WRITE);
161 else
162 value_new |= BIT(APU2_GPIO_BIT_WRITE);
163
164 iowrite32(value_new, pled->param.addr);
165
166 spin_unlock(&apu_led->lock);
167}
168
169static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
170{
171 int i;
172 int err;
173
174 apu_led->pled = devm_kzalloc(dev,
175 sizeof(struct apu_led_priv) * apu_led->num_led_instances,
176 GFP_KERNEL);
177
178 if (!apu_led->pled)
179 return -ENOMEM;
180
181 for (i = 0; i < apu_led->num_led_instances; i++) {
182 struct apu_led_priv *pled = &apu_led->pled[i];
183 struct led_classdev *led_cdev = &pled->cdev;
184
185 led_cdev->name = apu_led->profile[i].name;
186 led_cdev->brightness = apu_led->profile[i].brightness;
187 led_cdev->max_brightness = 1;
188 led_cdev->flags = LED_CORE_SUSPENDRESUME;
189 if (apu_led->platform == APU1_LED_PLATFORM)
190 led_cdev->brightness_set = apu1_led_brightness_set;
191 else if (apu_led->platform == APU2_LED_PLATFORM)
192 led_cdev->brightness_set = apu2_led_brightness_set;
193
194 pled->param.addr = devm_ioremap(dev,
195 apu_led->profile[i].offset, apu_led->iosize);
196 if (!pled->param.addr) {
197 err = -ENOMEM;
198 goto error;
199 }
200
201 err = led_classdev_register(dev, led_cdev);
202 if (err)
203 goto error;
204
205 led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness);
206 }
207
208 return 0;
209
210error:
211 while (i-- > 0)
212 led_classdev_unregister(&apu_led->pled[i].cdev);
213
214 return err;
215}
216
217static int __init apu_led_probe(struct platform_device *pdev)
218{
219 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);
220
221 if (!apu_led)
222 return -ENOMEM;
223
224 apu_led->pdev = pdev;
225
226 if (dmi_match(DMI_PRODUCT_NAME, "APU")) {
227 apu_led->profile = apu1_led_profile;
228 apu_led->platform = APU1_LED_PLATFORM;
229 apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile);
230 apu_led->iosize = APU1_IOSIZE;
231 } else if (dmi_match(DMI_BOARD_NAME, "APU2") ||
232 dmi_match(DMI_BOARD_NAME, "apu2") ||
233 dmi_match(DMI_BOARD_NAME, "PC Engines apu2")) {
234 apu_led->profile = apu2_led_profile;
235 apu_led->platform = APU2_LED_PLATFORM;
236 apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile);
237 apu_led->iosize = APU2_IOSIZE;
238 }
239
240 spin_lock_init(&apu_led->lock);
241 return apu_led_config(&pdev->dev, apu_led);
242}
243
244static struct platform_driver apu_led_driver = {
245 .driver = {
246 .name = KBUILD_MODNAME,
247 },
248};
249
250static int __init apu_led_init(void)
251{
252 struct platform_device *pdev;
253 int err;
254
255 if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {
256 pr_err("No PC Engines board detected\n");
257 return -ENODEV;
258 }
259 if (!(dmi_match(DMI_PRODUCT_NAME, "APU") ||
260 dmi_match(DMI_PRODUCT_NAME, "APU2") ||
261 dmi_match(DMI_PRODUCT_NAME, "apu2") ||
262 dmi_match(DMI_PRODUCT_NAME, "PC Engines apu2"))) {
263 pr_err("Unknown PC Engines board: %s\n",
264 dmi_get_system_info(DMI_PRODUCT_NAME));
265 return -ENODEV;
266 }
267
268 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
269 if (IS_ERR(pdev)) {
270 pr_err("Device allocation failed\n");
271 return PTR_ERR(pdev);
272 }
273
274 err = platform_driver_probe(&apu_led_driver, apu_led_probe);
275 if (err) {
276 pr_err("Probe platform driver failed\n");
277 platform_device_unregister(pdev);
278 }
279
280 return err;
281}
282
283static void __exit apu_led_exit(void)
284{
285 int i;
286
287 for (i = 0; i < apu_led->num_led_instances; i++)
288 led_classdev_unregister(&apu_led->pled[i].cdev);
289
290 platform_device_unregister(apu_led->pdev);
291 platform_driver_unregister(&apu_led_driver);
292}
293
294module_init(apu_led_init);
295module_exit(apu_led_exit);
296
297MODULE_AUTHOR("Alan Mizrahi");
298MODULE_DESCRIPTION("PC Engines APU family LED driver");
299MODULE_LICENSE("GPL v2");
300MODULE_ALIAS("platform:leds_apu");