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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>");
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