1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* leds-sunfire.c: SUNW,Ultra-Enterprise LED driver. |
3 | * |
4 | * Copyright (C) 2008 David S. Miller <davem@davemloft.net> |
5 | */ |
6 | |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> |
12 | #include <linux/leds.h> |
13 | #include <linux/io.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/slab.h> |
16 | |
17 | #include <asm/fhc.h> |
18 | #include <asm/upa.h> |
19 | |
20 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)" ); |
21 | MODULE_DESCRIPTION("Sun Fire LED driver" ); |
22 | MODULE_LICENSE("GPL" ); |
23 | |
24 | struct sunfire_led { |
25 | struct led_classdev led_cdev; |
26 | void __iomem *reg; |
27 | }; |
28 | #define to_sunfire_led(d) container_of(d, struct sunfire_led, led_cdev) |
29 | |
30 | static void __clockboard_set(struct led_classdev *led_cdev, |
31 | enum led_brightness led_val, u8 bit) |
32 | { |
33 | struct sunfire_led *p = to_sunfire_led(led_cdev); |
34 | u8 reg = upa_readb(p->reg); |
35 | |
36 | switch (bit) { |
37 | case CLOCK_CTRL_LLED: |
38 | if (led_val) |
39 | reg &= ~bit; |
40 | else |
41 | reg |= bit; |
42 | break; |
43 | |
44 | default: |
45 | if (led_val) |
46 | reg |= bit; |
47 | else |
48 | reg &= ~bit; |
49 | break; |
50 | } |
51 | upa_writeb(reg, p->reg); |
52 | } |
53 | |
54 | static void clockboard_left_set(struct led_classdev *led_cdev, |
55 | enum led_brightness led_val) |
56 | { |
57 | __clockboard_set(led_cdev, led_val, bit: CLOCK_CTRL_LLED); |
58 | } |
59 | |
60 | static void clockboard_middle_set(struct led_classdev *led_cdev, |
61 | enum led_brightness led_val) |
62 | { |
63 | __clockboard_set(led_cdev, led_val, bit: CLOCK_CTRL_MLED); |
64 | } |
65 | |
66 | static void clockboard_right_set(struct led_classdev *led_cdev, |
67 | enum led_brightness led_val) |
68 | { |
69 | __clockboard_set(led_cdev, led_val, bit: CLOCK_CTRL_RLED); |
70 | } |
71 | |
72 | static void __fhc_set(struct led_classdev *led_cdev, |
73 | enum led_brightness led_val, u32 bit) |
74 | { |
75 | struct sunfire_led *p = to_sunfire_led(led_cdev); |
76 | u32 reg = upa_readl(p->reg); |
77 | |
78 | switch (bit) { |
79 | case FHC_CONTROL_LLED: |
80 | if (led_val) |
81 | reg &= ~bit; |
82 | else |
83 | reg |= bit; |
84 | break; |
85 | |
86 | default: |
87 | if (led_val) |
88 | reg |= bit; |
89 | else |
90 | reg &= ~bit; |
91 | break; |
92 | } |
93 | upa_writel(reg, p->reg); |
94 | } |
95 | |
96 | static void fhc_left_set(struct led_classdev *led_cdev, |
97 | enum led_brightness led_val) |
98 | { |
99 | __fhc_set(led_cdev, led_val, bit: FHC_CONTROL_LLED); |
100 | } |
101 | |
102 | static void fhc_middle_set(struct led_classdev *led_cdev, |
103 | enum led_brightness led_val) |
104 | { |
105 | __fhc_set(led_cdev, led_val, bit: FHC_CONTROL_MLED); |
106 | } |
107 | |
108 | static void fhc_right_set(struct led_classdev *led_cdev, |
109 | enum led_brightness led_val) |
110 | { |
111 | __fhc_set(led_cdev, led_val, bit: FHC_CONTROL_RLED); |
112 | } |
113 | |
114 | typedef void (*set_handler)(struct led_classdev *, enum led_brightness); |
115 | struct led_type { |
116 | const char *name; |
117 | set_handler handler; |
118 | const char *default_trigger; |
119 | }; |
120 | |
121 | #define NUM_LEDS_PER_BOARD 3 |
122 | struct sunfire_drvdata { |
123 | struct sunfire_led leds[NUM_LEDS_PER_BOARD]; |
124 | }; |
125 | |
126 | static int sunfire_led_generic_probe(struct platform_device *pdev, |
127 | struct led_type *types) |
128 | { |
129 | struct sunfire_drvdata *p; |
130 | int i, err; |
131 | |
132 | if (pdev->num_resources != 1) { |
133 | dev_err(&pdev->dev, "Wrong number of resources %d, should be 1\n" , |
134 | pdev->num_resources); |
135 | return -EINVAL; |
136 | } |
137 | |
138 | p = devm_kzalloc(dev: &pdev->dev, size: sizeof(*p), GFP_KERNEL); |
139 | if (!p) |
140 | return -ENOMEM; |
141 | |
142 | for (i = 0; i < NUM_LEDS_PER_BOARD; i++) { |
143 | struct led_classdev *lp = &p->leds[i].led_cdev; |
144 | |
145 | p->leds[i].reg = (void __iomem *) pdev->resource[0].start; |
146 | lp->name = types[i].name; |
147 | lp->brightness = LED_FULL; |
148 | lp->brightness_set = types[i].handler; |
149 | lp->default_trigger = types[i].default_trigger; |
150 | |
151 | err = led_classdev_register(parent: &pdev->dev, led_cdev: lp); |
152 | if (err) { |
153 | dev_err(&pdev->dev, "Could not register %s LED\n" , |
154 | lp->name); |
155 | for (i--; i >= 0; i--) |
156 | led_classdev_unregister(led_cdev: &p->leds[i].led_cdev); |
157 | return err; |
158 | } |
159 | } |
160 | |
161 | platform_set_drvdata(pdev, data: p); |
162 | |
163 | return 0; |
164 | } |
165 | |
166 | static void sunfire_led_generic_remove(struct platform_device *pdev) |
167 | { |
168 | struct sunfire_drvdata *p = platform_get_drvdata(pdev); |
169 | int i; |
170 | |
171 | for (i = 0; i < NUM_LEDS_PER_BOARD; i++) |
172 | led_classdev_unregister(led_cdev: &p->leds[i].led_cdev); |
173 | } |
174 | |
175 | static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = { |
176 | { |
177 | .name = "clockboard-left" , |
178 | .handler = clockboard_left_set, |
179 | }, |
180 | { |
181 | .name = "clockboard-middle" , |
182 | .handler = clockboard_middle_set, |
183 | }, |
184 | { |
185 | .name = "clockboard-right" , |
186 | .handler = clockboard_right_set, |
187 | .default_trigger = "heartbeat" , |
188 | }, |
189 | }; |
190 | |
191 | static int sunfire_clockboard_led_probe(struct platform_device *pdev) |
192 | { |
193 | return sunfire_led_generic_probe(pdev, types: clockboard_led_types); |
194 | } |
195 | |
196 | static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = { |
197 | { |
198 | .name = "fhc-left" , |
199 | .handler = fhc_left_set, |
200 | }, |
201 | { |
202 | .name = "fhc-middle" , |
203 | .handler = fhc_middle_set, |
204 | }, |
205 | { |
206 | .name = "fhc-right" , |
207 | .handler = fhc_right_set, |
208 | .default_trigger = "heartbeat" , |
209 | }, |
210 | }; |
211 | |
212 | static int sunfire_fhc_led_probe(struct platform_device *pdev) |
213 | { |
214 | return sunfire_led_generic_probe(pdev, types: fhc_led_types); |
215 | } |
216 | |
217 | MODULE_ALIAS("platform:sunfire-clockboard-leds" ); |
218 | MODULE_ALIAS("platform:sunfire-fhc-leds" ); |
219 | |
220 | static struct platform_driver sunfire_clockboard_led_driver = { |
221 | .probe = sunfire_clockboard_led_probe, |
222 | .remove_new = sunfire_led_generic_remove, |
223 | .driver = { |
224 | .name = "sunfire-clockboard-leds" , |
225 | }, |
226 | }; |
227 | |
228 | static struct platform_driver sunfire_fhc_led_driver = { |
229 | .probe = sunfire_fhc_led_probe, |
230 | .remove_new = sunfire_led_generic_remove, |
231 | .driver = { |
232 | .name = "sunfire-fhc-leds" , |
233 | }, |
234 | }; |
235 | |
236 | static struct platform_driver * const drivers[] = { |
237 | &sunfire_clockboard_led_driver, |
238 | &sunfire_fhc_led_driver, |
239 | }; |
240 | |
241 | static int __init sunfire_leds_init(void) |
242 | { |
243 | return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); |
244 | } |
245 | |
246 | static void __exit sunfire_leds_exit(void) |
247 | { |
248 | platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); |
249 | } |
250 | |
251 | module_init(sunfire_leds_init); |
252 | module_exit(sunfire_leds_exit); |
253 | |