1 // SPDX-License-Identifier: GPL-2.0+
2 
3 /*
4  * PC-Engines APUv2/APUv3 board platform driver
5  * for GPIO buttons and LEDs
6  *
7  * Copyright (C) 2018 metux IT consult
8  * Author: Enrico Weigelt <info@metux.net>
9  */
10 
11 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
12 
13 #include <linux/dmi.h>
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/leds.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/gpio_keys.h>
20 #include <linux/gpio/machine.h>
21 #include <linux/input.h>
22 #include <linux/platform_data/gpio/gpio-amd-fch.h>
23 
24 /*
25  * NOTE: this driver only supports APUv2/3 - not APUv1, as this one
26  * has completely different register layouts.
27  */
28 
29 /* Register mappings */
30 #define APU2_GPIO_REG_LED1		AMD_FCH_GPIO_REG_GPIO57
31 #define APU2_GPIO_REG_LED2		AMD_FCH_GPIO_REG_GPIO58
32 #define APU2_GPIO_REG_LED3		AMD_FCH_GPIO_REG_GPIO59_DEVSLP1
33 #define APU2_GPIO_REG_MODESW		AMD_FCH_GPIO_REG_GPIO32_GE1
34 #define APU2_GPIO_REG_SIMSWAP		AMD_FCH_GPIO_REG_GPIO33_GE2
35 #define APU2_GPIO_REG_MPCIE2		AMD_FCH_GPIO_REG_GPIO55_DEVSLP0
36 #define APU2_GPIO_REG_MPCIE3		AMD_FCH_GPIO_REG_GPIO51
37 
38 /* Order in which the GPIO lines are defined in the register list */
39 #define APU2_GPIO_LINE_LED1		0
40 #define APU2_GPIO_LINE_LED2		1
41 #define APU2_GPIO_LINE_LED3		2
42 #define APU2_GPIO_LINE_MODESW		3
43 #define APU2_GPIO_LINE_SIMSWAP		4
44 #define APU2_GPIO_LINE_MPCIE2		5
45 #define APU2_GPIO_LINE_MPCIE3		6
46 
47 /* GPIO device */
48 
49 static int apu2_gpio_regs[] = {
50 	[APU2_GPIO_LINE_LED1]		= APU2_GPIO_REG_LED1,
51 	[APU2_GPIO_LINE_LED2]		= APU2_GPIO_REG_LED2,
52 	[APU2_GPIO_LINE_LED3]		= APU2_GPIO_REG_LED3,
53 	[APU2_GPIO_LINE_MODESW]		= APU2_GPIO_REG_MODESW,
54 	[APU2_GPIO_LINE_SIMSWAP]	= APU2_GPIO_REG_SIMSWAP,
55 	[APU2_GPIO_LINE_MPCIE2]		= APU2_GPIO_REG_MPCIE2,
56 	[APU2_GPIO_LINE_MPCIE3]		= APU2_GPIO_REG_MPCIE3,
57 };
58 
59 static const char * const apu2_gpio_names[] = {
60 	[APU2_GPIO_LINE_LED1]		= "front-led1",
61 	[APU2_GPIO_LINE_LED2]		= "front-led2",
62 	[APU2_GPIO_LINE_LED3]		= "front-led3",
63 	[APU2_GPIO_LINE_MODESW]		= "front-button",
64 	[APU2_GPIO_LINE_SIMSWAP]	= "simswap",
65 	[APU2_GPIO_LINE_MPCIE2]		= "mpcie2_reset",
66 	[APU2_GPIO_LINE_MPCIE3]		= "mpcie3_reset",
67 };
68 
69 static const struct amd_fch_gpio_pdata board_apu2 = {
70 	.gpio_num	= ARRAY_SIZE(apu2_gpio_regs),
71 	.gpio_reg	= apu2_gpio_regs,
72 	.gpio_names	= apu2_gpio_names,
73 };
74 
75 /* GPIO LEDs device */
76 
77 static const struct gpio_led apu2_leds[] = {
78 	{ .name = "apu:green:1" },
79 	{ .name = "apu:green:2" },
80 	{ .name = "apu:green:3" },
81 };
82 
83 static const struct gpio_led_platform_data apu2_leds_pdata = {
84 	.num_leds	= ARRAY_SIZE(apu2_leds),
85 	.leds		= apu2_leds,
86 };
87 
88 static struct gpiod_lookup_table gpios_led_table = {
89 	.dev_id = "leds-gpio",
90 	.table = {
91 		GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1,
92 				NULL, 0, GPIO_ACTIVE_LOW),
93 		GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2,
94 				NULL, 1, GPIO_ACTIVE_LOW),
95 		GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3,
96 				NULL, 2, GPIO_ACTIVE_LOW),
97 		{} /* Terminating entry */
98 	}
99 };
100 
101 /* GPIO keyboard device */
102 
103 static struct gpio_keys_button apu2_keys_buttons[] = {
104 	{
105 		.code			= KEY_RESTART,
106 		.active_low		= 1,
107 		.desc			= "front button",
108 		.type			= EV_KEY,
109 		.debounce_interval	= 10,
110 		.value			= 1,
111 	},
112 };
113 
114 static const struct gpio_keys_platform_data apu2_keys_pdata = {
115 	.buttons	= apu2_keys_buttons,
116 	.nbuttons	= ARRAY_SIZE(apu2_keys_buttons),
117 	.poll_interval	= 100,
118 	.rep		= 0,
119 	.name		= "apu2-keys",
120 };
121 
122 static struct gpiod_lookup_table gpios_key_table = {
123 	.dev_id = "gpio-keys-polled",
124 	.table = {
125 		GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW,
126 				NULL, 0, GPIO_ACTIVE_LOW),
127 		{} /* Terminating entry */
128 	}
129 };
130 
131 /* Board setup */
132 
133 /* Note: matching works on string prefix, so "apu2" must come before "apu" */
134 static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
135 
136 	/* APU2 w/ legacy BIOS < 4.0.8 */
137 	{
138 		.ident		= "apu2",
139 		.matches	= {
140 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
141 			DMI_MATCH(DMI_BOARD_NAME, "APU2")
142 		},
143 		.driver_data	= (void *)&board_apu2,
144 	},
145 	/* APU2 w/ legacy BIOS >= 4.0.8 */
146 	{
147 		.ident		= "apu2",
148 		.matches	= {
149 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
150 			DMI_MATCH(DMI_BOARD_NAME, "apu2")
151 		},
152 		.driver_data	= (void *)&board_apu2,
153 	},
154 	/* APU2 w/ mainline BIOS */
155 	{
156 		.ident		= "apu2",
157 		.matches	= {
158 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
159 			DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
160 		},
161 		.driver_data	= (void *)&board_apu2,
162 	},
163 
164 	/* APU3 w/ legacy BIOS < 4.0.8 */
165 	{
166 		.ident		= "apu3",
167 		.matches	= {
168 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
169 			DMI_MATCH(DMI_BOARD_NAME, "APU3")
170 		},
171 		.driver_data = (void *)&board_apu2,
172 	},
173 	/* APU3 w/ legacy BIOS >= 4.0.8 */
174 	{
175 		.ident       = "apu3",
176 		.matches     = {
177 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
178 			DMI_MATCH(DMI_BOARD_NAME, "apu3")
179 		},
180 		.driver_data = (void *)&board_apu2,
181 	},
182 	/* APU3 w/ mainline BIOS */
183 	{
184 		.ident       = "apu3",
185 		.matches     = {
186 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
187 			DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
188 		},
189 		.driver_data = (void *)&board_apu2,
190 	},
191 	/* APU4 w/ legacy BIOS < 4.0.8 */
192 	{
193 		.ident        = "apu4",
194 		.matches    = {
195 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
196 			DMI_MATCH(DMI_BOARD_NAME, "APU4")
197 		},
198 		.driver_data = (void *)&board_apu2,
199 	},
200 	/* APU4 w/ legacy BIOS >= 4.0.8 */
201 	{
202 		.ident       = "apu4",
203 		.matches     = {
204 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
205 			DMI_MATCH(DMI_BOARD_NAME, "apu4")
206 		},
207 		.driver_data = (void *)&board_apu2,
208 	},
209 	/* APU4 w/ mainline BIOS */
210 	{
211 		.ident       = "apu4",
212 		.matches     = {
213 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
214 			DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu4")
215 		},
216 		.driver_data = (void *)&board_apu2,
217 	},
218 	{}
219 };
220 
221 static struct platform_device *apu_gpio_pdev;
222 static struct platform_device *apu_leds_pdev;
223 static struct platform_device *apu_keys_pdev;
224 
apu_create_pdev(const char * name,const void * pdata,size_t sz)225 static struct platform_device * __init apu_create_pdev(
226 	const char *name,
227 	const void *pdata,
228 	size_t sz)
229 {
230 	struct platform_device *pdev;
231 
232 	pdev = platform_device_register_resndata(NULL,
233 		name,
234 		PLATFORM_DEVID_NONE,
235 		NULL,
236 		0,
237 		pdata,
238 		sz);
239 
240 	if (IS_ERR(pdev))
241 		pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev));
242 
243 	return pdev;
244 }
245 
apu_board_init(void)246 static int __init apu_board_init(void)
247 {
248 	const struct dmi_system_id *id;
249 
250 	id = dmi_first_match(apu_gpio_dmi_table);
251 	if (!id) {
252 		pr_err("failed to detect APU board via DMI\n");
253 		return -ENODEV;
254 	}
255 
256 	gpiod_add_lookup_table(&gpios_led_table);
257 	gpiod_add_lookup_table(&gpios_key_table);
258 
259 	apu_gpio_pdev = apu_create_pdev(
260 		AMD_FCH_GPIO_DRIVER_NAME,
261 		id->driver_data,
262 		sizeof(struct amd_fch_gpio_pdata));
263 
264 	apu_leds_pdev = apu_create_pdev(
265 		"leds-gpio",
266 		&apu2_leds_pdata,
267 		sizeof(apu2_leds_pdata));
268 
269 	apu_keys_pdev = apu_create_pdev(
270 		"gpio-keys-polled",
271 		&apu2_keys_pdata,
272 		sizeof(apu2_keys_pdata));
273 
274 	return 0;
275 }
276 
apu_board_exit(void)277 static void __exit apu_board_exit(void)
278 {
279 	gpiod_remove_lookup_table(&gpios_led_table);
280 	gpiod_remove_lookup_table(&gpios_key_table);
281 
282 	platform_device_unregister(apu_keys_pdev);
283 	platform_device_unregister(apu_leds_pdev);
284 	platform_device_unregister(apu_gpio_pdev);
285 }
286 
287 module_init(apu_board_init);
288 module_exit(apu_board_exit);
289 
290 MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
291 MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LEDs/keys driver");
292 MODULE_LICENSE("GPL");
293 MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
294 MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled");
295