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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 | * The ChromeOS EC multi function device is used to mux all the requests | |
16 | * to the EC device for its multiple features: keyboard controller, | |
17 | * battery charging and regulator control, firmware update. | |
18 | */ | |
19 | ||
bb03ffb9 | 20 | #include <linux/of_platform.h> |
4ab6174e SG |
21 | #include <linux/interrupt.h> |
22 | #include <linux/slab.h> | |
5ebeaff5 | 23 | #include <linux/module.h> |
4ab6174e SG |
24 | #include <linux/mfd/core.h> |
25 | #include <linux/mfd/cros_ec.h> | |
6f1d912b | 26 | #include <asm/unaligned.h> |
a6551a76 | 27 | |
57b33ff0 GG |
28 | #define CROS_EC_DEV_EC_INDEX 0 |
29 | #define CROS_EC_DEV_PD_INDEX 1 | |
30 | ||
cf649e00 | 31 | static struct cros_ec_platform ec_p = { |
57b33ff0 GG |
32 | .ec_name = CROS_EC_DEV_NAME, |
33 | .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX), | |
34 | }; | |
35 | ||
cf649e00 | 36 | static struct cros_ec_platform pd_p = { |
57b33ff0 GG |
37 | .ec_name = CROS_EC_DEV_PD_NAME, |
38 | .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX), | |
39 | }; | |
40 | ||
cf649e00 | 41 | static const struct mfd_cell ec_cell = { |
57b33ff0 GG |
42 | .name = "cros-ec-ctl", |
43 | .platform_data = &ec_p, | |
44 | .pdata_size = sizeof(ec_p), | |
45 | }; | |
46 | ||
cf649e00 | 47 | static const struct mfd_cell ec_pd_cell = { |
57b33ff0 GG |
48 | .name = "cros-ec-ctl", |
49 | .platform_data = &pd_p, | |
50 | .pdata_size = sizeof(pd_p), | |
4ab6174e SG |
51 | }; |
52 | ||
6f1d912b VY |
53 | static irqreturn_t ec_irq_thread(int irq, void *data) |
54 | { | |
55 | struct cros_ec_device *ec_dev = data; | |
56 | int ret; | |
57 | ||
58 | if (device_may_wakeup(ec_dev->dev)) | |
59 | pm_wakeup_event(ec_dev->dev, 0); | |
60 | ||
61 | ret = cros_ec_get_next_event(ec_dev); | |
62 | if (ret > 0) | |
63 | blocking_notifier_call_chain(&ec_dev->event_notifier, | |
64 | 0, ec_dev); | |
65 | return IRQ_HANDLED; | |
66 | } | |
67 | ||
4ab6174e SG |
68 | int cros_ec_register(struct cros_ec_device *ec_dev) |
69 | { | |
70 | struct device *dev = ec_dev->dev; | |
71 | int err = 0; | |
72 | ||
6f1d912b VY |
73 | BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier); |
74 | ||
2c7589af SB |
75 | ec_dev->max_request = sizeof(struct ec_params_hello); |
76 | ec_dev->max_response = sizeof(struct ec_response_get_protocol_info); | |
77 | ec_dev->max_passthru = 0; | |
78 | ||
79 | ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); | |
80 | if (!ec_dev->din) | |
81 | return -ENOMEM; | |
82 | ||
83 | ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); | |
84 | if (!ec_dev->dout) | |
85 | return -ENOMEM; | |
4ab6174e | 86 | |
63427530 AB |
87 | mutex_init(&ec_dev->lock); |
88 | ||
2c7589af SB |
89 | cros_ec_query_all(ec_dev); |
90 | ||
6f1d912b VY |
91 | if (ec_dev->irq) { |
92 | err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread, | |
93 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
94 | "chromeos-ec", ec_dev); | |
95 | if (err) { | |
96 | dev_err(dev, "Failed to request IRQ %d: %d", | |
97 | ec_dev->irq, err); | |
98 | return err; | |
99 | } | |
100 | } | |
101 | ||
57b33ff0 | 102 | err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell, 1, |
4ab6174e SG |
103 | NULL, ec_dev->irq, NULL); |
104 | if (err) { | |
57b33ff0 GG |
105 | dev_err(dev, |
106 | "Failed to register Embedded Controller subdevice %d\n", | |
107 | err); | |
6f1d912b | 108 | goto fail_mfd; |
4ab6174e SG |
109 | } |
110 | ||
57b33ff0 GG |
111 | if (ec_dev->max_passthru) { |
112 | /* | |
113 | * Register a PD device as well on top of this device. | |
114 | * We make the following assumptions: | |
115 | * - behind an EC, we have a pd | |
116 | * - only one device added. | |
117 | * - the EC is responsive at init time (it is not true for a | |
118 | * sensor hub. | |
119 | */ | |
120 | err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, | |
121 | &ec_pd_cell, 1, NULL, ec_dev->irq, NULL); | |
122 | if (err) { | |
123 | dev_err(dev, | |
124 | "Failed to register Power Delivery subdevice %d\n", | |
125 | err); | |
6f1d912b | 126 | goto fail_mfd; |
57b33ff0 GG |
127 | } |
128 | } | |
129 | ||
bb03ffb9 TB |
130 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { |
131 | err = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
132 | if (err) { | |
133 | mfd_remove_devices(dev); | |
134 | dev_err(dev, "Failed to register sub-devices\n"); | |
6f1d912b | 135 | goto fail_mfd; |
bb03ffb9 TB |
136 | } |
137 | } | |
138 | ||
533cec8f | 139 | dev_info(dev, "Chrome EC device registered\n"); |
4ab6174e SG |
140 | |
141 | return 0; | |
6f1d912b VY |
142 | |
143 | fail_mfd: | |
144 | if (ec_dev->irq) | |
145 | free_irq(ec_dev->irq, ec_dev); | |
146 | return err; | |
4ab6174e | 147 | } |
5ebeaff5 | 148 | EXPORT_SYMBOL(cros_ec_register); |
4ab6174e SG |
149 | |
150 | int cros_ec_remove(struct cros_ec_device *ec_dev) | |
151 | { | |
152 | mfd_remove_devices(ec_dev->dev); | |
4ab6174e SG |
153 | |
154 | return 0; | |
155 | } | |
5ebeaff5 | 156 | EXPORT_SYMBOL(cros_ec_remove); |
4ab6174e SG |
157 | |
158 | #ifdef CONFIG_PM_SLEEP | |
159 | int cros_ec_suspend(struct cros_ec_device *ec_dev) | |
160 | { | |
161 | struct device *dev = ec_dev->dev; | |
162 | ||
163 | if (device_may_wakeup(dev)) | |
164 | ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq); | |
165 | ||
166 | disable_irq(ec_dev->irq); | |
167 | ec_dev->was_wake_device = ec_dev->wake_enabled; | |
a9eb186e | 168 | ec_dev->suspended = true; |
4ab6174e SG |
169 | |
170 | return 0; | |
171 | } | |
5ebeaff5 | 172 | EXPORT_SYMBOL(cros_ec_suspend); |
4ab6174e | 173 | |
6f1d912b VY |
174 | static void cros_ec_drain_events(struct cros_ec_device *ec_dev) |
175 | { | |
176 | while (cros_ec_get_next_event(ec_dev) > 0) | |
177 | blocking_notifier_call_chain(&ec_dev->event_notifier, | |
178 | 1, ec_dev); | |
179 | } | |
180 | ||
4ab6174e SG |
181 | int cros_ec_resume(struct cros_ec_device *ec_dev) |
182 | { | |
a9eb186e | 183 | ec_dev->suspended = false; |
4ab6174e SG |
184 | enable_irq(ec_dev->irq); |
185 | ||
6f1d912b VY |
186 | /* |
187 | * In some cases, we need to distinguish between events that occur | |
188 | * during suspend if the EC is not a wake source. For example, | |
189 | * keypresses during suspend should be discarded if it does not wake | |
190 | * the system. | |
191 | * | |
192 | * If the EC is not a wake source, drain the event queue and mark them | |
193 | * as "queued during suspend". | |
194 | */ | |
4ab6174e SG |
195 | if (ec_dev->wake_enabled) { |
196 | disable_irq_wake(ec_dev->irq); | |
197 | ec_dev->wake_enabled = 0; | |
6f1d912b VY |
198 | } else { |
199 | cros_ec_drain_events(ec_dev); | |
4ab6174e SG |
200 | } |
201 | ||
202 | return 0; | |
203 | } | |
5ebeaff5 SO |
204 | EXPORT_SYMBOL(cros_ec_resume); |
205 | ||
4ab6174e | 206 | #endif |
a865a589 BR |
207 | |
208 | MODULE_LICENSE("GPL"); | |
209 | MODULE_DESCRIPTION("ChromeOS EC core driver"); |