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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 | void activate_emu_uart(void); | |
38 | ||
39 | #define MAPPHONE_BPWAKE_STROBE_GPIO 157 | |
40 | ||
41 | static int __init headphone_cons_init(void) | |
42 | { | |
43 | /* Get the headset switch gpio number from devtree */ | |
44 | hs_switch = get_gpio_by_name("headset_uart_switch"); | |
45 | if (hs_switch < 0) | |
46 | return -EINVAL; | |
47 | ||
48 | printk(KERN_INFO "headset_uart_switch: %d, value: %d\n", hs_switch, gpio_get_value(hs_switch)); | |
49 | ||
50 | if (!gpio_get_value(hs_switch)) | |
51 | return -ENODEV; | |
52 | ||
53 | printk(KERN_INFO "Loading slightly modified omap serial driver...\n"); | |
54 | my_serial_omap_init(); | |
55 | ||
56 | printk(KERN_INFO "Enabling UART3...\n"); | |
57 | my_omap_serial_init(MAPPHONE_BPWAKE_STROBE_GPIO, 0x01); | |
58 | my_omap_hs_init(); | |
59 | ||
60 | /* route kernel uart out headset jack */ | |
61 | gpio_set_value(hs_switch, 0); | |
62 | printk(KERN_INFO "headset_uart_switch: %d, value: %d\n", hs_switch, gpio_get_value(hs_switch)); | |
63 | ||
64 | activate_emu_uart(); | |
65 | ||
66 | //add_preferred_console("ttyS", 2, "115200"); | |
67 | return 0; | |
68 | } | |
69 | ||
70 | #if 0 | |
71 | static void __exit headphone_cons_exit(void) | |
72 | { | |
73 | if (hs_switch < 0) | |
74 | return; | |
75 | ||
76 | printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch)); | |
77 | gpio_direction_output(hs_switch, 1); | |
78 | printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch)); | |
79 | } | |
80 | #endif | |
81 | ||
82 | ||
83 | module_init(headphone_cons_init); | |
84 | #if 0 | |
85 | module_exit(headphone_cons_exit); | |
86 | #endif | |
87 | ||
88 | MODULE_LICENSE("GPL"); | |
89 | MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>"); |