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e6b5be2be4
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
198 lines
4.8 KiB
C
198 lines
4.8 KiB
C
/*
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* Regulator driver for PWM Regulators
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*
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* Copyright (C) 2014 - STMicroelectronics Inc.
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*
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* Author: Lee Jones <lee.jones@linaro.org>
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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 version 2 as
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* published by the Free Software Foundation.
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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/err.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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#include <linux/of_device.h>
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#include <linux/pwm.h>
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struct pwm_regulator_data {
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struct regulator_desc desc;
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struct pwm_voltages *duty_cycle_table;
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struct pwm_device *pwm;
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bool enabled;
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int state;
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};
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struct pwm_voltages {
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unsigned int uV;
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unsigned int dutycycle;
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};
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static int pwm_regulator_get_voltage_sel(struct regulator_dev *dev)
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{
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struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
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return drvdata->state;
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}
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static int pwm_regulator_set_voltage_sel(struct regulator_dev *dev,
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unsigned selector)
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{
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struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
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unsigned int pwm_reg_period;
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int dutycycle;
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int ret;
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pwm_reg_period = pwm_get_period(drvdata->pwm);
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dutycycle = (pwm_reg_period *
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drvdata->duty_cycle_table[selector].dutycycle) / 100;
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ret = pwm_config(drvdata->pwm, dutycycle, pwm_reg_period);
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if (ret) {
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dev_err(&dev->dev, "Failed to configure PWM\n");
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return ret;
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}
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drvdata->state = selector;
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if (!drvdata->enabled) {
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ret = pwm_enable(drvdata->pwm);
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if (ret) {
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dev_err(&dev->dev, "Failed to enable PWM\n");
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return ret;
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}
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drvdata->enabled = true;
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}
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return 0;
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}
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static int pwm_regulator_list_voltage(struct regulator_dev *dev,
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unsigned selector)
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{
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struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
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if (selector >= drvdata->desc.n_voltages)
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return -EINVAL;
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return drvdata->duty_cycle_table[selector].uV;
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}
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static struct regulator_ops pwm_regulator_voltage_ops = {
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.set_voltage_sel = pwm_regulator_set_voltage_sel,
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.get_voltage_sel = pwm_regulator_get_voltage_sel,
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.list_voltage = pwm_regulator_list_voltage,
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.map_voltage = regulator_map_voltage_iterate,
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};
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static const struct regulator_desc pwm_regulator_desc = {
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.name = "pwm-regulator",
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.ops = &pwm_regulator_voltage_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.supply_name = "pwm",
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};
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static int pwm_regulator_probe(struct platform_device *pdev)
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{
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struct pwm_regulator_data *drvdata;
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struct property *prop;
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struct regulator_dev *regulator;
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struct regulator_config config = { };
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struct device_node *np = pdev->dev.of_node;
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int length, ret;
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if (!np) {
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dev_err(&pdev->dev, "Device Tree node missing\n");
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return -EINVAL;
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}
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drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(pwm_regulator_desc));
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/* determine the number of voltage-table */
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prop = of_find_property(np, "voltage-table", &length);
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if (!prop) {
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dev_err(&pdev->dev, "No voltage-table\n");
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return -EINVAL;
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}
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if ((length < sizeof(*drvdata->duty_cycle_table)) ||
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(length % sizeof(*drvdata->duty_cycle_table))) {
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dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
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length);
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return -EINVAL;
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}
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drvdata->desc.n_voltages = length / sizeof(*drvdata->duty_cycle_table);
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drvdata->duty_cycle_table = devm_kzalloc(&pdev->dev,
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length, GFP_KERNEL);
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if (!drvdata->duty_cycle_table)
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return -ENOMEM;
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/* read voltage table from DT property */
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ret = of_property_read_u32_array(np, "voltage-table",
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(u32 *)drvdata->duty_cycle_table,
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length / sizeof(u32));
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if (ret < 0) {
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dev_err(&pdev->dev, "read voltage-table failed\n");
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return ret;
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}
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config.init_data = of_get_regulator_init_data(&pdev->dev, np,
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&drvdata->desc);
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if (!config.init_data)
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return -ENOMEM;
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config.of_node = np;
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config.dev = &pdev->dev;
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config.driver_data = drvdata;
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drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
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if (IS_ERR(drvdata->pwm)) {
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dev_err(&pdev->dev, "Failed to get PWM\n");
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return PTR_ERR(drvdata->pwm);
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}
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regulator = devm_regulator_register(&pdev->dev,
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&drvdata->desc, &config);
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if (IS_ERR(regulator)) {
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dev_err(&pdev->dev, "Failed to register regulator %s\n",
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drvdata->desc.name);
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return PTR_ERR(regulator);
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}
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return 0;
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}
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static const struct of_device_id pwm_of_match[] = {
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{ .compatible = "pwm-regulator" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, pwm_of_match);
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static struct platform_driver pwm_regulator_driver = {
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.driver = {
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.name = "pwm-regulator",
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.of_match_table = of_match_ptr(pwm_of_match),
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},
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.probe = pwm_regulator_probe,
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};
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module_platform_driver(pwm_regulator_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
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MODULE_DESCRIPTION("PWM Regulator Driver");
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MODULE_ALIAS("platform:pwm-regulator");
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