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7#include <linux/err.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/leds.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/string.h>
14#include <linux/pci.h>
15
16static int force = 0;
17module_param(force, bool, 0444);
18MODULE_PARM_DESC(force, "Assume system has ALIX.2/ALIX.3 style LEDs");
19
20#define MSR_LBAR_GPIO 0x5140000C
21#define CS5535_GPIO_SIZE 256
22
23static u32 gpio_base;
24
25static struct pci_device_id divil_pci[] = {
26 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
27 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
28 { }
29};
30MODULE_DEVICE_TABLE(pci, divil_pci);
31
32struct alix_led {
33 struct led_classdev cdev;
34 unsigned short port;
35 unsigned int on_value;
36 unsigned int off_value;
37};
38
39static void alix_led_set(struct led_classdev *led_cdev,
40 enum led_brightness brightness)
41{
42 struct alix_led *led_dev =
43 container_of(led_cdev, struct alix_led, cdev);
44
45 if (brightness)
46 outl(led_dev->on_value, gpio_base + led_dev->port);
47 else
48 outl(led_dev->off_value, gpio_base + led_dev->port);
49}
50
51static struct alix_led alix_leds[] = {
52 {
53 .cdev = {
54 .name = "alix:1",
55 .brightness_set = alix_led_set,
56 },
57 .port = 0x00,
58 .on_value = 1 << 22,
59 .off_value = 1 << 6,
60 },
61 {
62 .cdev = {
63 .name = "alix:2",
64 .brightness_set = alix_led_set,
65 },
66 .port = 0x80,
67 .on_value = 1 << 25,
68 .off_value = 1 << 9,
69 },
70 {
71 .cdev = {
72 .name = "alix:3",
73 .brightness_set = alix_led_set,
74 },
75 .port = 0x80,
76 .on_value = 1 << 27,
77 .off_value = 1 << 11,
78 },
79};
80
81static int __init alix_led_probe(struct platform_device *pdev)
82{
83 int i;
84 int ret;
85
86 for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
87 alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME;
88 ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
89 if (ret < 0)
90 goto fail;
91 }
92 return 0;
93
94fail:
95 while (--i >= 0)
96 led_classdev_unregister(&alix_leds[i].cdev);
97 return ret;
98}
99
100static int alix_led_remove(struct platform_device *pdev)
101{
102 int i;
103
104 for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
105 led_classdev_unregister(&alix_leds[i].cdev);
106 return 0;
107}
108
109static struct platform_driver alix_led_driver = {
110 .remove = alix_led_remove,
111 .driver = {
112 .name = KBUILD_MODNAME,
113 .owner = THIS_MODULE,
114 },
115};
116
117static int __init alix_present(unsigned long bios_phys,
118 const char *alix_sig,
119 size_t alix_sig_len)
120{
121 const size_t bios_len = 0x00010000;
122 const char *bios_virt;
123 const char *scan_end;
124 const char *p;
125 char name[64];
126
127 if (force) {
128 printk(KERN_NOTICE "%s: forced to skip BIOS test, "
129 "assume system has ALIX.2 style LEDs\n",
130 KBUILD_MODNAME);
131 return 1;
132 }
133
134 bios_virt = phys_to_virt(bios_phys);
135 scan_end = bios_virt + bios_len - (alix_sig_len + 2);
136 for (p = bios_virt; p < scan_end; p++) {
137 const char *tail;
138 char *a;
139
140 if (memcmp(p, alix_sig, alix_sig_len) != 0)
141 continue;
142
143 memcpy(name, p, sizeof(name));
144
145
146 a = strchr(name, '\0');
147 if (a)
148 *a = ' ';
149
150
151 a = strchr(name, '\r');
152 if (a)
153 *a = '\0';
154
155 tail = p + alix_sig_len;
156 if ((tail[0] == '2' || tail[0] == '3')) {
157 printk(KERN_INFO
158 "%s: system is recognized as \"%s\"\n",
159 KBUILD_MODNAME, name);
160 return 1;
161 }
162 }
163
164 return 0;
165}
166
167static struct platform_device *pdev;
168
169static int __init alix_pci_led_init(void)
170{
171 u32 low, hi;
172
173 if (pci_dev_present(divil_pci) == 0) {
174 printk(KERN_WARNING KBUILD_MODNAME": DIVIL not found\n");
175 return -ENODEV;
176 }
177
178
179 rdmsr(MSR_LBAR_GPIO, low, hi);
180
181
182 if (hi != 0x0000f001) {
183 printk(KERN_WARNING KBUILD_MODNAME": GPIO not enabled\n");
184 return -ENODEV;
185 }
186
187
188 gpio_base = low & 0x0000ff00;
189
190 if (!request_region(gpio_base, CS5535_GPIO_SIZE, KBUILD_MODNAME)) {
191 printk(KERN_ERR KBUILD_MODNAME": can't allocate I/O for GPIO\n");
192 return -ENODEV;
193 }
194
195
196 outl(1 << 6, gpio_base + 0x04);
197 outl(1 << 9, gpio_base + 0x84);
198 outl(1 << 11, gpio_base + 0x84);
199
200 return 0;
201}
202
203static int __init alix_led_init(void)
204{
205 int ret = -ENODEV;
206 const char tinybios_sig[] = "PC Engines ALIX.";
207 const char coreboot_sig[] = "PC Engines\0ALIX.";
208
209 if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
210 alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
211 ret = alix_pci_led_init();
212
213 if (ret < 0)
214 return ret;
215
216 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
217 if (!IS_ERR(pdev)) {
218 ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
219 if (ret)
220 platform_device_unregister(pdev);
221 } else
222 ret = PTR_ERR(pdev);
223
224 return ret;
225}
226
227static void __exit alix_led_exit(void)
228{
229 platform_device_unregister(pdev);
230 platform_driver_unregister(&alix_led_driver);
231 release_region(gpio_base, CS5535_GPIO_SIZE);
232}
233
234module_init(alix_led_init);
235module_exit(alix_led_exit);
236
237MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>");
238MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver");
239MODULE_LICENSE("GPL");
240
