268 lines
7.1 KiB
C
268 lines
7.1 KiB
C
/*
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* Copyright (c) 2013 Google, Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Power supply consumer driver for ChromeOS EC Charger
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*/
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/module.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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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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/* Device Type 1 Reg */
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#define TSU6721_TYPE_NONE 0x000000
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#define TSU6721_TYPE_USB_HOST 0x000004
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#define TSU6721_TYPE_CHG12 0x000010
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#define TSU6721_TYPE_CDP 0x000020
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#define TSU6721_TYPE_DCP 0x000040
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/* Device Type 2 Reg */
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#define TSU6721_TYPE_JIG_UART_ON 0x000400
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#define TSU6721_TYPE_AUDIO3 0x008000
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/* Device Type 3 Reg */
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#define TSU6721_TYPE_APPLE_CHG 0x200000
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#define TSU6721_TYPE_U200_CHG 0x400000
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#define TSU6721_TYPE_NON_STD_CHG 0x040000
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/* VBUS_DEBOUNCED might show up together with other type */
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#define TSU6721_TYPE_VBUS_DEBOUNCED 0x020000
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#define CHARGING_MASK (TSU6721_TYPE_USB_HOST | TSU6721_TYPE_CHG12 | \
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TSU6721_TYPE_CDP | TSU6721_TYPE_DCP | \
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TSU6721_TYPE_APPLE_CHG | TSU6721_TYPE_U200_CHG | \
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TSU6721_TYPE_NON_STD_CHG | TSU6721_TYPE_JIG_UART_ON)
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struct charger_data {
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struct device *dev;
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struct power_supply charger;
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};
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static enum power_supply_property cros_ec_charger_props[] = {
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POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
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POWER_SUPPLY_PROP_CURRENT_NOW, /* current flowing out of charger */
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POWER_SUPPLY_PROP_VOLTAGE_NOW, /* voltage at charger */
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POWER_SUPPLY_PROP_POWER_NOW, /* product of voltage & current props */
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};
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static int is_debounced(struct ec_response_power_info *ec_data)
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{
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return !!(ec_data->usb_dev_type & TSU6721_TYPE_VBUS_DEBOUNCED);
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}
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static void update_psu_type(struct power_supply *psy,
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struct ec_response_power_info *ec_data)
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{
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dev_dbg(psy->dev, "dev_type = 0x%06x cur_limit = %d\n",
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ec_data->usb_dev_type & CHARGING_MASK,
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ec_data->usb_current_limit);
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psy->type = POWER_SUPPLY_TYPE_UNKNOWN;
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if (is_debounced(ec_data)) {
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switch (ec_data->usb_dev_type & CHARGING_MASK) {
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case TSU6721_TYPE_USB_HOST:
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case TSU6721_TYPE_JIG_UART_ON:
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psy->type = POWER_SUPPLY_TYPE_USB;
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break;
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case TSU6721_TYPE_CDP:
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psy->type = POWER_SUPPLY_TYPE_USB_CDP;
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break;
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case TSU6721_TYPE_DCP:
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case TSU6721_TYPE_APPLE_CHG:
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psy->type = POWER_SUPPLY_TYPE_USB_DCP;
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break;
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case TSU6721_TYPE_CHG12:
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psy->type = POWER_SUPPLY_TYPE_MAINS;
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break;
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}
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}
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}
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static int get_ec_power_info(struct power_supply *psy,
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struct ec_response_power_info *ec_info)
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{
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struct charger_data *charger_data = container_of(psy,
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struct charger_data,
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charger);
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struct cros_ec_command msg;
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struct device *dev = charger_data->dev;
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struct cros_ec_device *ec = dev_get_drvdata(dev->parent);
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int ret;
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msg.version = 0;
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msg.command = EC_CMD_POWER_INFO;
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msg.outdata = NULL;
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msg.outsize = 0;
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msg.indata = (u8 *)ec_info;
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msg.insize = sizeof(struct ec_response_power_info);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0) {
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dev_err(dev, "Unable to query EC power info (err:%d)\n",
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ret);
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return ret;
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}
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return 0;
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}
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static void cros_ec_charger_power_changed(struct power_supply *psy)
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{
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struct ec_response_power_info ec_info;
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get_ec_power_info(psy, &ec_info);
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update_psu_type(psy, &ec_info);
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}
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static int cros_ec_charger_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct ec_response_power_info ec_info;
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int ret = get_ec_power_info(psy, &ec_info);
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if (ret)
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return -EINVAL;
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/* Zero properties unless we've detected presence of AC */
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if (!is_debounced(&ec_info)) {
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val->intval = 0;
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return 0;
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}
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = 1;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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val->intval = ec_info.current_system * 1000;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = ec_info.voltage_system * 1000;
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break;
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case POWER_SUPPLY_PROP_POWER_NOW:
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val->intval = ec_info.voltage_system *
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ec_info.current_system;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static char *charger_supplied_to[] = {"cros-ec-charger"};
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static int cros_ec_charger_probe(struct platform_device *pd)
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{
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struct cros_ec_device *ec = dev_get_drvdata(pd->dev.parent);
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struct charger_data *charger_data;
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struct power_supply *psy;
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struct device *dev = &pd->dev;
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struct device_node *mfd_np, *charger_np;
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int ret = 0;
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if (!ec) {
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dev_err(dev, "no EC device found\n");
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return -EINVAL;
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}
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mfd_np = dev->parent->of_node;
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if (!mfd_np) {
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dev_err(dev, "no device tree data available\n");
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return -EINVAL;
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}
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charger_np = of_find_node_by_name(mfd_np, "charger");
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if (!charger_np) {
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dev_err(dev, "no OF charger data found at %s\n",
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mfd_np->full_name);
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return -EINVAL;
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}
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charger_data = devm_kzalloc(dev, sizeof(struct charger_data),
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GFP_KERNEL);
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if (!charger_data) {
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dev_err(dev, "Failed to alloc driver structure\n");
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return -ENOMEM;
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}
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psy = &charger_data->charger;
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charger_data->dev = dev;
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psy->name = "cros-ec-charger";
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psy->supplied_to = charger_supplied_to;
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psy->num_supplicants = ARRAY_SIZE(charger_supplied_to);
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psy->type = POWER_SUPPLY_TYPE_UNKNOWN;
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psy->get_property = cros_ec_charger_get_prop;
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psy->external_power_changed = cros_ec_charger_power_changed;
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psy->properties = cros_ec_charger_props;
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psy->num_properties = ARRAY_SIZE(cros_ec_charger_props);
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platform_set_drvdata(pd, charger_data);
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ret = power_supply_register(dev, psy);
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if (ret) {
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dev_err(dev, "failed: power supply register\n");
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return ret;
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}
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ec->charger = psy;
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return 0;
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}
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static int cros_ec_charger_remove(struct platform_device *pd)
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{
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struct charger_data *charger_data = platform_get_drvdata(pd);
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power_supply_unregister(&charger_data->charger);
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platform_set_drvdata(pd, NULL);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int cros_ec_charger_resume(struct device *dev)
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{
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struct charger_data *charger_data = dev_get_drvdata(dev);
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power_supply_changed(&charger_data->charger);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(cros_ec_charger_pm_ops, NULL,
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cros_ec_charger_resume);
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static struct platform_driver cros_ec_charger_driver = {
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.driver = {
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.name = "cros-ec-charger",
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.owner = THIS_MODULE,
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.pm = &cros_ec_charger_pm_ops,
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},
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.probe = cros_ec_charger_probe,
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.remove = cros_ec_charger_remove,
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};
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module_platform_driver(cros_ec_charger_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Chrome EC charger");
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MODULE_ALIAS("power_supply:cros-ec-charger");
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