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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_check_system(apu_led_dmi_table)) {
185 pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n");
186 return -ENODEV;
187 }
188
189 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
190 if (IS_ERR(pdev)) {
191 pr_err("Device allocation failed\n");
192 return PTR_ERR(pdev);
193 }
194
195 err = platform_driver_probe(&apu_led_driver, apu_led_probe);
196 if (err) {
197 pr_err("Probe platform driver failed\n");
198 platform_device_unregister(pdev);
199 }
200
201 return err;
202}
203
204static void __exit apu_led_exit(void)
205{
206 int i;
207
208 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++)
209 led_classdev_unregister(&apu_led->pled[i].cdev);
210
211 platform_device_unregister(apu_led->pdev);
212 platform_driver_unregister(&apu_led_driver);
213}
214
215module_init(apu_led_init);
216module_exit(apu_led_exit);
217
218MODULE_AUTHOR("Alan Mizrahi");
219MODULE_DESCRIPTION("PC Engines APU1 front LED driver");
220MODULE_LICENSE("GPL v2");
221MODULE_ALIAS("platform:leds_apu");