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Simon Glass4ab61742013-02-25 14:08:37 -08001/*
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
20#include <linux/interrupt.h>
21#include <linux/slab.h>
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +010022#include <linux/module.h>
Simon Glass4ab61742013-02-25 14:08:37 -080023#include <linux/mfd/core.h>
24#include <linux/mfd/cros_ec.h>
25#include <linux/mfd/cros_ec_commands.h>
26
27int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
Bill Richardson5d4773e2014-06-18 11:14:02 -070028 struct cros_ec_command *msg)
Simon Glass4ab61742013-02-25 14:08:37 -080029{
30 uint8_t *out;
31 int csum, i;
32
Bill Richardson5d4773e2014-06-18 11:14:02 -070033 BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE);
Simon Glass4ab61742013-02-25 14:08:37 -080034 out = ec_dev->dout;
35 out[0] = EC_CMD_VERSION0 + msg->version;
Bill Richardson5d4773e2014-06-18 11:14:02 -070036 out[1] = msg->command;
37 out[2] = msg->outsize;
Simon Glass4ab61742013-02-25 14:08:37 -080038 csum = out[0] + out[1] + out[2];
Bill Richardson5d4773e2014-06-18 11:14:02 -070039 for (i = 0; i < msg->outsize; i++)
40 csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->outdata[i];
41 out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = (uint8_t)(csum & 0xff);
Simon Glass4ab61742013-02-25 14:08:37 -080042
Bill Richardson5d4773e2014-06-18 11:14:02 -070043 return EC_MSG_TX_PROTO_BYTES + msg->outsize;
Simon Glass4ab61742013-02-25 14:08:37 -080044}
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +010045EXPORT_SYMBOL(cros_ec_prepare_tx);
Simon Glass4ab61742013-02-25 14:08:37 -080046
Bill Richardson6db07b62014-06-18 11:14:05 -070047int cros_ec_check_result(struct cros_ec_device *ec_dev,
48 struct cros_ec_command *msg)
49{
50 switch (msg->result) {
51 case EC_RES_SUCCESS:
52 return 0;
53 case EC_RES_IN_PROGRESS:
54 dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
55 msg->command);
56 return -EAGAIN;
57 default:
58 dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
59 msg->command, msg->result);
60 return 0;
61 }
62}
63EXPORT_SYMBOL(cros_ec_check_result);
64
Simon Glass4ab61742013-02-25 14:08:37 -080065static irqreturn_t ec_irq_thread(int irq, void *data)
66{
67 struct cros_ec_device *ec_dev = data;
68
69 if (device_may_wakeup(ec_dev->dev))
70 pm_wakeup_event(ec_dev->dev, 0);
71
72 blocking_notifier_call_chain(&ec_dev->event_notifier, 1, ec_dev);
73
74 return IRQ_HANDLED;
75}
76
Geert Uytterhoeven5ac98552013-11-18 14:33:06 +010077static const struct mfd_cell cros_devs[] = {
Simon Glass4ab61742013-02-25 14:08:37 -080078 {
79 .name = "cros-ec-keyb",
80 .id = 1,
81 .of_compatible = "google,cros-ec-keyb",
82 },
Doug Anderson9d230c92014-04-30 10:44:09 -070083 {
84 .name = "cros-ec-i2c-tunnel",
85 .id = 2,
86 .of_compatible = "google,cros-ec-i2c-tunnel",
87 },
Simon Glass4ab61742013-02-25 14:08:37 -080088};
89
90int cros_ec_register(struct cros_ec_device *ec_dev)
91{
92 struct device *dev = ec_dev->dev;
93 int err = 0;
94
95 BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);
96
Simon Glass4ab61742013-02-25 14:08:37 -080097 if (ec_dev->din_size) {
Lee Jones22f9ee72013-05-23 16:25:10 +010098 ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
99 if (!ec_dev->din)
100 return -ENOMEM;
Simon Glass4ab61742013-02-25 14:08:37 -0800101 }
102 if (ec_dev->dout_size) {
Lee Jones22f9ee72013-05-23 16:25:10 +0100103 ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
104 if (!ec_dev->dout)
105 return -ENOMEM;
Simon Glass4ab61742013-02-25 14:08:37 -0800106 }
107
108 if (!ec_dev->irq) {
109 dev_dbg(dev, "no valid IRQ: %d\n", ec_dev->irq);
Lee Jones22f9ee72013-05-23 16:25:10 +0100110 return err;
Simon Glass4ab61742013-02-25 14:08:37 -0800111 }
112
113 err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
114 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
115 "chromeos-ec", ec_dev);
116 if (err) {
117 dev_err(dev, "request irq %d: error %d\n", ec_dev->irq, err);
Lee Jones22f9ee72013-05-23 16:25:10 +0100118 return err;
Simon Glass4ab61742013-02-25 14:08:37 -0800119 }
120
121 err = mfd_add_devices(dev, 0, cros_devs,
122 ARRAY_SIZE(cros_devs),
123 NULL, ec_dev->irq, NULL);
124 if (err) {
125 dev_err(dev, "failed to add mfd devices\n");
126 goto fail_mfd;
127 }
128
Bill Richardson533cec82014-06-18 11:14:03 -0700129 dev_info(dev, "Chrome EC device registered\n");
Simon Glass4ab61742013-02-25 14:08:37 -0800130
131 return 0;
132
133fail_mfd:
134 free_irq(ec_dev->irq, ec_dev);
Lee Jones22f9ee72013-05-23 16:25:10 +0100135
Simon Glass4ab61742013-02-25 14:08:37 -0800136 return err;
137}
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +0100138EXPORT_SYMBOL(cros_ec_register);
Simon Glass4ab61742013-02-25 14:08:37 -0800139
140int cros_ec_remove(struct cros_ec_device *ec_dev)
141{
142 mfd_remove_devices(ec_dev->dev);
143 free_irq(ec_dev->irq, ec_dev);
Simon Glass4ab61742013-02-25 14:08:37 -0800144
145 return 0;
146}
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +0100147EXPORT_SYMBOL(cros_ec_remove);
Simon Glass4ab61742013-02-25 14:08:37 -0800148
149#ifdef CONFIG_PM_SLEEP
150int cros_ec_suspend(struct cros_ec_device *ec_dev)
151{
152 struct device *dev = ec_dev->dev;
153
154 if (device_may_wakeup(dev))
155 ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);
156
157 disable_irq(ec_dev->irq);
158 ec_dev->was_wake_device = ec_dev->wake_enabled;
159
160 return 0;
161}
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +0100162EXPORT_SYMBOL(cros_ec_suspend);
Simon Glass4ab61742013-02-25 14:08:37 -0800163
164int cros_ec_resume(struct cros_ec_device *ec_dev)
165{
166 enable_irq(ec_dev->irq);
167
168 if (ec_dev->wake_enabled) {
169 disable_irq_wake(ec_dev->irq);
170 ec_dev->wake_enabled = 0;
171 }
172
173 return 0;
174}
Samuel Ortiz5ebeaff2013-03-20 09:46:15 +0100175EXPORT_SYMBOL(cros_ec_resume);
176
Simon Glass4ab61742013-02-25 14:08:37 -0800177#endif
Bill Richardsona865a582014-04-17 12:32:17 -0700178
179MODULE_LICENSE("GPL");
180MODULE_DESCRIPTION("ChromeOS EC core driver");