mirror of https://gitee.com/openkylin/linux.git
195 lines
4.6 KiB
C
195 lines
4.6 KiB
C
/*
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* ChromeOS EC multi-function device
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*
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* Copyright (C) 2012 Google, Inc
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* The ChromeOS EC multi function device is used to mux all the requests
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* to the EC device for its multiple features: keyboard controller,
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* battery charging and regulator control, firmware update.
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*/
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
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struct cros_ec_msg *msg)
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{
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uint8_t *out;
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int csum, i;
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BUG_ON(msg->out_len > EC_PROTO2_MAX_PARAM_SIZE);
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out = ec_dev->dout;
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out[0] = EC_CMD_VERSION0 + msg->version;
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out[1] = msg->cmd;
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out[2] = msg->out_len;
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csum = out[0] + out[1] + out[2];
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for (i = 0; i < msg->out_len; i++)
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csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->out_buf[i];
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out[EC_MSG_TX_HEADER_BYTES + msg->out_len] = (uint8_t)(csum & 0xff);
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return EC_MSG_TX_PROTO_BYTES + msg->out_len;
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}
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EXPORT_SYMBOL(cros_ec_prepare_tx);
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static int cros_ec_command_sendrecv(struct cros_ec_device *ec_dev,
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uint16_t cmd, void *out_buf, int out_len,
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void *in_buf, int in_len)
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{
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struct cros_ec_msg msg;
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msg.version = cmd >> 8;
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msg.cmd = cmd & 0xff;
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msg.out_buf = out_buf;
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msg.out_len = out_len;
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msg.in_buf = in_buf;
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msg.in_len = in_len;
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return ec_dev->command_xfer(ec_dev, &msg);
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}
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static int cros_ec_command_recv(struct cros_ec_device *ec_dev,
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uint16_t cmd, void *buf, int buf_len)
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{
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return cros_ec_command_sendrecv(ec_dev, cmd, NULL, 0, buf, buf_len);
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}
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static int cros_ec_command_send(struct cros_ec_device *ec_dev,
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uint16_t cmd, void *buf, int buf_len)
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{
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return cros_ec_command_sendrecv(ec_dev, cmd, buf, buf_len, NULL, 0);
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}
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static irqreturn_t ec_irq_thread(int irq, void *data)
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{
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struct cros_ec_device *ec_dev = data;
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if (device_may_wakeup(ec_dev->dev))
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pm_wakeup_event(ec_dev->dev, 0);
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blocking_notifier_call_chain(&ec_dev->event_notifier, 1, ec_dev);
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return IRQ_HANDLED;
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}
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static const struct mfd_cell cros_devs[] = {
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{
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.name = "cros-ec-keyb",
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.id = 1,
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.of_compatible = "google,cros-ec-keyb",
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},
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{
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.name = "cros-ec-i2c-tunnel",
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.id = 2,
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.of_compatible = "google,cros-ec-i2c-tunnel",
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},
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};
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int cros_ec_register(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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int err = 0;
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BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);
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ec_dev->command_send = cros_ec_command_send;
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ec_dev->command_recv = cros_ec_command_recv;
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ec_dev->command_sendrecv = cros_ec_command_sendrecv;
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if (ec_dev->din_size) {
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ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
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if (!ec_dev->din)
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return -ENOMEM;
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}
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if (ec_dev->dout_size) {
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ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
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if (!ec_dev->dout)
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return -ENOMEM;
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}
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if (!ec_dev->irq) {
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dev_dbg(dev, "no valid IRQ: %d\n", ec_dev->irq);
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return err;
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}
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err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"chromeos-ec", ec_dev);
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if (err) {
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dev_err(dev, "request irq %d: error %d\n", ec_dev->irq, err);
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return err;
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}
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err = mfd_add_devices(dev, 0, cros_devs,
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ARRAY_SIZE(cros_devs),
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NULL, ec_dev->irq, NULL);
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if (err) {
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dev_err(dev, "failed to add mfd devices\n");
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goto fail_mfd;
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}
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dev_info(dev, "Chrome EC (%s)\n", ec_dev->name);
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return 0;
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fail_mfd:
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free_irq(ec_dev->irq, ec_dev);
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return err;
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}
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EXPORT_SYMBOL(cros_ec_register);
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int cros_ec_remove(struct cros_ec_device *ec_dev)
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{
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mfd_remove_devices(ec_dev->dev);
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free_irq(ec_dev->irq, ec_dev);
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_remove);
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#ifdef CONFIG_PM_SLEEP
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int cros_ec_suspend(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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if (device_may_wakeup(dev))
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ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);
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disable_irq(ec_dev->irq);
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ec_dev->was_wake_device = ec_dev->wake_enabled;
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_suspend);
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int cros_ec_resume(struct cros_ec_device *ec_dev)
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{
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enable_irq(ec_dev->irq);
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if (ec_dev->wake_enabled) {
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disable_irq_wake(ec_dev->irq);
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ec_dev->wake_enabled = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_resume);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ChromeOS EC core driver");
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