293 lines
7.7 KiB
C
293 lines
7.7 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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*
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* Expose the ChromeOS EC regulator information.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/err.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/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/of.h>
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#define MAX_REGULATORS 10
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struct ec_tps65090_regulator {
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u32 control_reg;
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struct cros_ec_device *ec;
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struct regulator_desc desc;
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struct regulator_dev *rdev;
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};
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struct ec_tps65090_data {
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struct ec_tps65090_regulator *regulators[MAX_REGULATORS];
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};
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/* Control register for FETs(7) range from 15 -> 21 and correspond to
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FET number (1-7) on the EC side */
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#define reg_to_ec_fet_index(reg) (reg->control_reg - 14)
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static int ec_tps65090_fet_is_enabled(struct regulator_dev *rdev)
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{
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struct ec_tps65090_regulator *reg = rdev_get_drvdata(rdev);
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struct cros_ec_device *ec = reg->ec;
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struct cros_ec_command msg;
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struct ec_params_ldo_get ec_data;
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struct ec_response_ldo_get ec_info;
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int ret;
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ec_data.index = reg_to_ec_fet_index(reg);
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msg.version = 0;
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msg.command = EC_CMD_LDO_GET;
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msg.outdata = (u8 *)&ec_data;
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msg.outsize = sizeof(struct ec_params_ldo_get);
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msg.indata = (u8 *)&ec_info;
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msg.insize = sizeof(struct ec_response_ldo_get);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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return ret;
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return ec_info.state;
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}
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static int ec_tps65090_fet_enable(struct regulator_dev *rdev)
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{
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struct ec_params_ldo_set ec_data;
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struct ec_tps65090_regulator *reg = rdev_get_drvdata(rdev);
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struct cros_ec_device *ec = reg->ec;
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struct cros_ec_command msg;
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ec_data.index = reg_to_ec_fet_index(reg);
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ec_data.state = 1;
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msg.version = 0;
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msg.command = EC_CMD_LDO_SET;
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msg.outdata = (u8 *)&ec_data;
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msg.outsize = sizeof(struct ec_params_ldo_set);
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msg.indata = NULL;
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msg.insize = 0;
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return cros_ec_cmd_xfer(ec, &msg);
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}
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static int ec_tps65090_fet_disable(struct regulator_dev *rdev)
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{
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struct ec_tps65090_regulator *reg = rdev_get_drvdata(rdev);
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struct cros_ec_device *ec = reg->ec;
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struct cros_ec_command msg;
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struct ec_params_ldo_set ec_data;
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ec_data.index = reg_to_ec_fet_index(reg);
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ec_data.state = 0;
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msg.version = 0;
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msg.command = EC_CMD_LDO_SET;
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msg.outdata = (u8 *)&ec_data;
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msg.outsize = sizeof(struct ec_params_ldo_set);
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msg.indata = NULL;
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msg.insize = 0;
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return cros_ec_cmd_xfer(ec, &msg);
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}
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static int ec_tps65090_set_voltage(struct regulator_dev *rdev, int min,
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int max, unsigned *sel)
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{
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/*
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* Only needed for the core code to set constraints; the voltage
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* isn't actually adjustable on tps65090.
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*/
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return 0;
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}
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static struct regulator_ops ec_tps65090_fet_ops = {
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.is_enabled = ec_tps65090_fet_is_enabled,
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.enable = ec_tps65090_fet_enable,
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.disable = ec_tps65090_fet_disable,
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.set_voltage = ec_tps65090_set_voltage,
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.set_suspend_enable = ec_tps65090_fet_enable,
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.set_suspend_disable = ec_tps65090_fet_disable,
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};
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static void ec_tps65090_unregister_regs(struct ec_tps65090_regulator *regs[])
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{
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int i;
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for (i = 0; i < MAX_REGULATORS; i++)
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if (regs[i]) {
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regulator_unregister(regs[i]->rdev);
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kfree(regs[i]->rdev->desc->name);
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kfree(regs[i]->rdev);
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}
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}
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static int ec_tps65090_probe(struct platform_device *pdev)
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{
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struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct ec_tps65090_data *data;
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struct ec_tps65090_regulator *reg;
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struct device_node *reg_np, *np;
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struct regulator_init_data *ri;
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struct regulator_config config = { };
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u32 id;
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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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if (!dev->of_node) {
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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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reg_np = of_find_node_by_name(dev->of_node, "regulators");
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if (!reg_np) {
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dev_err(dev, "no OF regulator data found at %s\n",
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dev->of_node->full_name);
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return -EINVAL;
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}
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data = devm_kzalloc(dev, sizeof(struct ec_tps65090_data), GFP_KERNEL);
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if (!data) {
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of_node_put(reg_np);
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return -ENOMEM;
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}
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id = 0;
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for_each_child_of_node(reg_np, np) {
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ri = of_get_regulator_init_data(dev, np);
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if (!ri) {
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dev_err(dev, "regulator_init_data failed for %s\n",
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np->full_name);
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goto err;
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}
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reg = devm_kzalloc(dev, sizeof(struct ec_tps65090_regulator),
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GFP_KERNEL);
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reg->desc.name = kstrdup(of_get_property(np, "regulator-name",
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NULL), GFP_KERNEL);
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reg->ec = ec;
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if (!reg->desc.name) {
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dev_err(dev, "no regulator-name specified at %s\n",
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np->full_name);
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goto err;
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}
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if (of_property_read_u32(np, "tps65090-control-reg",
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®->control_reg)) {
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dev_err(dev, "no control-reg property at %s\n",
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np->full_name);
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goto err;
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}
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reg->desc.id = id;
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reg->desc.ops = &ec_tps65090_fet_ops;
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reg->desc.type = REGULATOR_VOLTAGE;
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reg->desc.owner = THIS_MODULE;
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config.dev = pdev->dev.parent;
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config.driver_data = reg;
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config.of_node = np;
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config.init_data = ri;
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reg->rdev = regulator_register(®->desc, &config);
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dev_dbg(dev, "%s supply registered (FET%d)\n", reg->desc.name,
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reg_to_ec_fet_index(reg));
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data->regulators[id++] = reg;
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}
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platform_set_drvdata(pdev, data);
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of_node_put(reg_np);
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return 0;
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err:
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dev_err(dev, "bad OF regulator data in %s\n", reg_np->full_name);
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ec_tps65090_unregister_regs(data->regulators);
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of_node_put(reg_np);
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return -EINVAL;
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}
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static int ec_tps65090_remove(struct platform_device *pdev)
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{
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struct ec_tps65090_data *data = platform_get_drvdata(pdev);
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ec_tps65090_unregister_regs(data->regulators);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int ec_tps65090_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ec_tps65090_data *data = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < MAX_REGULATORS; i++)
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if (data->regulators[i]) {
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struct regulator_dev *rdev = data->regulators[i]->rdev;
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struct regulator_state *rstate =
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&rdev->constraints->state_mem;
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struct regulator_ops *ops = rdev->desc->ops;
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if (rstate->disabled)
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ops->set_suspend_disable(rdev);
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}
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return 0;
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}
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static int ec_tps65090_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ec_tps65090_data *data = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < MAX_REGULATORS; i++)
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if (data->regulators[i]) {
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struct regulator_dev *rdev = data->regulators[i]->rdev;
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struct regulator_state *rstate =
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&rdev->constraints->state_mem;
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struct regulator_ops *ops = rdev->desc->ops;
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if (rstate->disabled && (rdev->use_count > 0 ||
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rdev->constraints->always_on))
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ops->enable(rdev);
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}
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ec_tps65090_pm_ops, ec_tps65090_suspend,
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ec_tps65090_resume);
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static struct platform_driver ec_tps65090_driver = {
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.driver = {
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.name = "cros-ec-tps65090",
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.owner = THIS_MODULE,
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.pm = &ec_tps65090_pm_ops,
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},
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.probe = ec_tps65090_probe,
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.remove = ec_tps65090_remove,
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};
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module_platform_driver(ec_tps65090_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ChromeOS EC TPS65090");
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MODULE_ALIAS("regulator:cros-ec-tps65090");
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