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4ab6174e SG |
1 | /* |
2 | * ChromeOS EC multi-function device | |
3 | * | |
4 | * Copyright (C) 2012 Google, Inc | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #ifndef __LINUX_MFD_CROS_EC_H | |
17 | #define __LINUX_MFD_CROS_EC_H | |
18 | ||
05c11ac4 | 19 | #include <linux/cdev.h> |
7e6cb5b4 | 20 | #include <linux/notifier.h> |
4ab6174e | 21 | #include <linux/mfd/cros_ec_commands.h> |
7e6cb5b4 | 22 | #include <linux/mutex.h> |
4ab6174e SG |
23 | |
24 | /* | |
25 | * Command interface between EC and AP, for LPC, I2C and SPI interfaces. | |
26 | */ | |
27 | enum { | |
28 | EC_MSG_TX_HEADER_BYTES = 3, | |
29 | EC_MSG_TX_TRAILER_BYTES = 1, | |
30 | EC_MSG_TX_PROTO_BYTES = EC_MSG_TX_HEADER_BYTES + | |
31 | EC_MSG_TX_TRAILER_BYTES, | |
32 | EC_MSG_RX_PROTO_BYTES = 3, | |
33 | ||
34 | /* Max length of messages */ | |
5271db29 BR |
35 | EC_MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE + |
36 | EC_MSG_TX_PROTO_BYTES, | |
4ab6174e SG |
37 | }; |
38 | ||
5d4773e2 | 39 | /* |
4ab6174e | 40 | * @version: Command version number (often 0) |
5d4773e2 | 41 | * @command: Command to send (EC_CMD_...) |
5d4773e2 | 42 | * @outsize: Outgoing length in bytes |
12ebc8a5 | 43 | * @insize: Max number of bytes to accept from EC |
5d4773e2 | 44 | * @result: EC's response to the command (separate from communication failure) |
1b84f2a4 JMC |
45 | * @outdata: Outgoing data to EC |
46 | * @indata: Where to put the incoming data from EC | |
4ab6174e | 47 | */ |
5d4773e2 BR |
48 | struct cros_ec_command { |
49 | uint32_t version; | |
50 | uint32_t command; | |
5d4773e2 | 51 | uint32_t outsize; |
5d4773e2 BR |
52 | uint32_t insize; |
53 | uint32_t result; | |
1b84f2a4 JMC |
54 | uint8_t outdata[EC_PROTO2_MAX_PARAM_SIZE]; |
55 | uint8_t indata[EC_PROTO2_MAX_PARAM_SIZE]; | |
4ab6174e SG |
56 | }; |
57 | ||
58 | /** | |
59 | * struct cros_ec_device - Information about a ChromeOS EC device | |
60 | * | |
7e6cb5b4 BR |
61 | * @ec_name: name of EC device (e.g. 'chromeos-ec') |
62 | * @phys_name: name of physical comms layer (e.g. 'i2c-4') | |
05c11ac4 JMC |
63 | * @dev: Device pointer for physical comms device |
64 | * @vdev: Device pointer for virtual comms device | |
65 | * @cdev: Character device structure for virtual comms device | |
7e6cb5b4 BR |
66 | * @was_wake_device: true if this device was set to wake the system from |
67 | * sleep at the last suspend | |
05c11ac4 JMC |
68 | * @cmd_readmem: direct read of the EC memory-mapped region, if supported |
69 | * @offset is within EC_LPC_ADDR_MEMMAP region. | |
70 | * @bytes: number of bytes to read. zero means "read a string" (including | |
71 | * the trailing '\0'). At most only EC_MEMMAP_SIZE bytes can be read. | |
72 | * Caller must ensure that the buffer is large enough for the result when | |
73 | * reading a string. | |
7e6cb5b4 | 74 | * |
4ab6174e SG |
75 | * @priv: Private data |
76 | * @irq: Interrupt to use | |
7e6cb5b4 BR |
77 | * @din: input buffer (for data from EC) |
78 | * @dout: output buffer (for data to EC) | |
4ab6174e SG |
79 | * \note |
80 | * These two buffers will always be dword-aligned and include enough | |
81 | * space for up to 7 word-alignment bytes also, so we can ensure that | |
82 | * the body of the message is always dword-aligned (64-bit). | |
4ab6174e SG |
83 | * We use this alignment to keep ARM and x86 happy. Probably word |
84 | * alignment would be OK, there might be a small performance advantage | |
85 | * to using dword. | |
2ce701ae BR |
86 | * @din_size: size of din buffer to allocate (zero to use static din) |
87 | * @dout_size: size of dout buffer to allocate (zero to use static dout) | |
4ab6174e | 88 | * @wake_enabled: true if this device can wake the system from sleep |
a6551a76 AB |
89 | * @cmd_xfer: send command to EC and get response |
90 | * Returns the number of bytes received if the communication succeeded, but | |
91 | * that doesn't mean the EC was happy with the command. The caller | |
92 | * should check msg.result for the EC's result code. | |
7e6cb5b4 | 93 | * @lock: one transaction at a time |
4ab6174e SG |
94 | */ |
95 | struct cros_ec_device { | |
7e6cb5b4 BR |
96 | |
97 | /* These are used by other drivers that want to talk to the EC */ | |
98 | const char *ec_name; | |
99 | const char *phys_name; | |
100 | struct device *dev; | |
05c11ac4 JMC |
101 | struct device *vdev; |
102 | struct cdev cdev; | |
7e6cb5b4 BR |
103 | bool was_wake_device; |
104 | struct class *cros_class; | |
05c11ac4 JMC |
105 | int (*cmd_readmem)(struct cros_ec_device *ec, unsigned int offset, |
106 | unsigned int bytes, void *dest); | |
7e6cb5b4 BR |
107 | |
108 | /* These are used to implement the platform-specific interface */ | |
4ab6174e SG |
109 | void *priv; |
110 | int irq; | |
111 | uint8_t *din; | |
112 | uint8_t *dout; | |
113 | int din_size; | |
114 | int dout_size; | |
4ab6174e | 115 | bool wake_enabled; |
a6551a76 AB |
116 | int (*cmd_xfer)(struct cros_ec_device *ec, |
117 | struct cros_ec_command *msg); | |
7e6cb5b4 | 118 | struct mutex lock; |
4ab6174e SG |
119 | }; |
120 | ||
121 | /** | |
122 | * cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device | |
123 | * | |
124 | * This can be called by drivers to handle a suspend event. | |
125 | * | |
126 | * ec_dev: Device to suspend | |
127 | * @return 0 if ok, -ve on error | |
128 | */ | |
129 | int cros_ec_suspend(struct cros_ec_device *ec_dev); | |
130 | ||
131 | /** | |
132 | * cros_ec_resume - Handle a resume operation for the ChromeOS EC device | |
133 | * | |
134 | * This can be called by drivers to handle a resume event. | |
135 | * | |
136 | * @ec_dev: Device to resume | |
137 | * @return 0 if ok, -ve on error | |
138 | */ | |
139 | int cros_ec_resume(struct cros_ec_device *ec_dev); | |
140 | ||
141 | /** | |
142 | * cros_ec_prepare_tx - Prepare an outgoing message in the output buffer | |
143 | * | |
144 | * This is intended to be used by all ChromeOS EC drivers, but at present | |
145 | * only SPI uses it. Once LPC uses the same protocol it can start using it. | |
146 | * I2C could use it now, with a refactor of the existing code. | |
147 | * | |
148 | * @ec_dev: Device to register | |
149 | * @msg: Message to write | |
150 | */ | |
151 | int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, | |
5d4773e2 | 152 | struct cros_ec_command *msg); |
4ab6174e | 153 | |
6db07b63 BR |
154 | /** |
155 | * cros_ec_check_result - Check ec_msg->result | |
156 | * | |
157 | * This is used by ChromeOS EC drivers to check the ec_msg->result for | |
158 | * errors and to warn about them. | |
159 | * | |
160 | * @ec_dev: EC device | |
161 | * @msg: Message to check | |
162 | */ | |
163 | int cros_ec_check_result(struct cros_ec_device *ec_dev, | |
164 | struct cros_ec_command *msg); | |
165 | ||
a6551a76 AB |
166 | /** |
167 | * cros_ec_cmd_xfer - Send a command to the ChromeOS EC | |
168 | * | |
169 | * Call this to send a command to the ChromeOS EC. This should be used | |
170 | * instead of calling the EC's cmd_xfer() callback directly. | |
171 | * | |
172 | * @ec_dev: EC device | |
173 | * @msg: Message to write | |
174 | */ | |
175 | int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, | |
176 | struct cros_ec_command *msg); | |
177 | ||
4ab6174e SG |
178 | /** |
179 | * cros_ec_remove - Remove a ChromeOS EC | |
180 | * | |
ee98662e | 181 | * Call this to deregister a ChromeOS EC, then clean up any private data. |
4ab6174e SG |
182 | * |
183 | * @ec_dev: Device to register | |
184 | * @return 0 if ok, -ve on error | |
185 | */ | |
186 | int cros_ec_remove(struct cros_ec_device *ec_dev); | |
187 | ||
188 | /** | |
189 | * cros_ec_register - Register a new ChromeOS EC, using the provided info | |
190 | * | |
191 | * Before calling this, allocate a pointer to a new device and then fill | |
192 | * in all the fields up to the --private-- marker. | |
193 | * | |
194 | * @ec_dev: Device to register | |
195 | * @return 0 if ok, -ve on error | |
196 | */ | |
197 | int cros_ec_register(struct cros_ec_device *ec_dev); | |
198 | ||
199 | #endif /* __LINUX_MFD_CROS_EC_H */ |