tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Copyright (C) 2007,2008 Freescale Semiconductor, Inc.
2 *
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the
5 * Free Software Foundation; either version 2 of the License, or (at your
6 * option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 675 Mass Ave, Cambridge, MA 02139, USA.
16 */
17
18#undef VERBOSE
19
20#ifdef VERBOSE
21#define VDBG(fmt, args...) pr_debug("[%s] " fmt , \
22 __func__, ## args)
23#else
24#define VDBG(stuff...) do {} while (0)
25#endif
26
27#ifdef VERBOSE
28#define MPC_LOC printk("Current Location [%s]:[%d]\n", __FILE__, __LINE__)
29#else
30#define MPC_LOC do {} while (0)
31#endif
32
33#define PROTO_UNDEF (0)
34#define PROTO_HOST (1)
35#define PROTO_GADGET (2)
36
37/* OTG state machine according to the OTG spec */
38struct otg_fsm {
39 /* Input */
40 int a_bus_resume;
41 int a_bus_suspend;
42 int a_conn;
43 int a_sess_vld;
44 int a_srp_det;
45 int a_vbus_vld;
46 int b_bus_resume;
47 int b_bus_suspend;
48 int b_conn;
49 int b_se0_srp;
50 int b_sess_end;
51 int b_sess_vld;
52 int id;
53
54 /* Internal variables */
55 int a_set_b_hnp_en;
56 int b_srp_done;
57 int b_hnp_enable;
58
59 /* Timeout indicator for timers */
60 int a_wait_vrise_tmout;
61 int a_wait_bcon_tmout;
62 int a_aidl_bdis_tmout;
63 int b_ase0_brst_tmout;
64
65 /* Informative variables */
66 int a_bus_drop;
67 int a_bus_req;
68 int a_clr_err;
69 int a_suspend_req;
70 int b_bus_req;
71
72 /* Output */
73 int drv_vbus;
74 int loc_conn;
75 int loc_sof;
76
77 struct otg_fsm_ops *ops;
78 struct usb_otg *otg;
79
80 /* Current usb protocol used: 0:undefine; 1:host; 2:client */
81 int protocol;
82 spinlock_t lock;
83};
84
85struct otg_fsm_ops {
86 void (*chrg_vbus)(int on);
87 void (*drv_vbus)(int on);
88 void (*loc_conn)(int on);
89 void (*loc_sof)(int on);
90 void (*start_pulse)(void);
91 void (*add_timer)(void *timer);
92 void (*del_timer)(void *timer);
93 int (*start_host)(struct otg_fsm *fsm, int on);
94 int (*start_gadget)(struct otg_fsm *fsm, int on);
95};
96
97
98static inline void otg_chrg_vbus(struct otg_fsm *fsm, int on)
99{
100 fsm->ops->chrg_vbus(on);
101}
102
103static inline void otg_drv_vbus(struct otg_fsm *fsm, int on)
104{
105 if (fsm->drv_vbus != on) {
106 fsm->drv_vbus = on;
107 fsm->ops->drv_vbus(on);
108 }
109}
110
111static inline void otg_loc_conn(struct otg_fsm *fsm, int on)
112{
113 if (fsm->loc_conn != on) {
114 fsm->loc_conn = on;
115 fsm->ops->loc_conn(on);
116 }
117}
118
119static inline void otg_loc_sof(struct otg_fsm *fsm, int on)
120{
121 if (fsm->loc_sof != on) {
122 fsm->loc_sof = on;
123 fsm->ops->loc_sof(on);
124 }
125}
126
127static inline void otg_start_pulse(struct otg_fsm *fsm)
128{
129 fsm->ops->start_pulse();
130}
131
132static inline void otg_add_timer(struct otg_fsm *fsm, void *timer)
133{
134 fsm->ops->add_timer(timer);
135}
136
137static inline void otg_del_timer(struct otg_fsm *fsm, void *timer)
138{
139 fsm->ops->del_timer(timer);
140}
141
142int otg_statemachine(struct otg_fsm *fsm);
143
144/* Defined by device specific driver, for different timer implementation */
145extern struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
146 *a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_fail_tmr,
147 *a_wait_enum_tmr;