]> git.zerfleddert.de Git - ms2-kexec/blob - hs_cons.c
8ca5b801ce23d42d4db9910f12f8d59a5bb0bf79
[ms2-kexec] / hs_cons.c
1 /*
2 * Provide kernel console on headphone jack
3 *
4 * Copyright (C) 2011 Michael Gernoth <michael@gernoth.net>
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11 #include <linux/module.h>
12 #include <linux/gpio_mapping.h>
13 #include <linux/gpio.h>
14 #include <linux/platform_device.h>
15 #include <linux/serial_reg.h>
16 #include <linux/clk.h>
17
18 #include <plat/board.h>
19 #include <plat/control.h>
20 #include <asm/mach/serial_omap.h>
21
22 #include "prm.h"
23 #include "prm-regbits-34xx.h"
24
25 static int hs_switch = -1;
26
27 /*
28 * int add_preferred_console(char *name, int idx, char *options)
29 * c0069208 T add_preferred_console
30 */
31
32 static int (*add_preferred_console)(char *, int, char*) = (int (*)(char*, int, char*))0xc0069208;
33
34 void my_omap_serial_init(int wake_gpio_strobe, unsigned int wake_strobe_enable_mask);
35 int my_omap_hs_init(void);
36 int my_serial_omap_init(void);
37
38 #define MAPPHONE_BPWAKE_STROBE_GPIO 157
39
40 static int __init headphone_cons_init(void)
41 {
42 /* Get the headset switch gpio number from devtree */
43 hs_switch = get_gpio_by_name("headset_uart_switch");
44 if (hs_switch < 0)
45 return -EINVAL;
46
47 printk(KERN_INFO "headset_uart_switch: %d, value: %d\n", hs_switch, gpio_get_value(hs_switch));
48
49 if (!gpio_get_value(hs_switch))
50 return -ENODEV;
51
52 printk(KERN_INFO "Loading slightly modified omap serial driver...\n");
53 my_serial_omap_init();
54
55 printk(KERN_INFO "Enabling UART3...\n");
56 my_omap_serial_init(MAPPHONE_BPWAKE_STROBE_GPIO, 0x01);
57 my_omap_hs_init();
58
59 /* route kernel uart out headset jack */
60 gpio_direction_output(hs_switch, 0);
61 printk(KERN_INFO "headset_uart_switch: %d, value: %d\n", hs_switch, gpio_get_value(hs_switch));
62
63 //add_preferred_console("ttyS", 2, "115200");
64 return 0;
65 }
66
67 #if 0
68 static void __exit headphone_cons_exit(void)
69 {
70 if (hs_switch < 0)
71 return;
72
73 printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
74 gpio_direction_output(hs_switch, 1);
75 printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
76 }
77 #endif
78
79
80 module_init(headphone_cons_init);
81 #if 0
82 module_exit(headphone_cons_exit);
83 #endif
84
85 MODULE_LICENSE("GPL");
86 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
Impressum, Datenschutz