243 lines
6.4 KiB
C
243 lines
6.4 KiB
C
/*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*/
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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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* 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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/mfd/anatop.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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struct anatop_regulator {
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const char *name;
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u32 control_reg;
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struct anatop *mfd;
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int vol_bit_shift;
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int vol_bit_width;
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int min_bit_val;
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int min_voltage;
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int max_voltage;
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struct regulator_desc rdesc;
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struct regulator_init_data *initdata;
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};
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static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
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int max_uV, unsigned *selector)
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{
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struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
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u32 val, sel;
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int uv;
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uv = min_uV;
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dev_dbg(®->dev, "%s: uv %d, min %d, max %d\n", __func__,
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uv, anatop_reg->min_voltage,
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anatop_reg->max_voltage);
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if (uv < anatop_reg->min_voltage) {
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if (max_uV > anatop_reg->min_voltage)
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uv = anatop_reg->min_voltage;
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else
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return -EINVAL;
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}
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if (!anatop_reg->control_reg)
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return -ENOTSUPP;
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sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);
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if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)
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return -EINVAL;
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val = anatop_reg->min_bit_val + sel;
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*selector = sel;
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dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val);
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anatop_set_bits(anatop_reg->mfd,
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anatop_reg->control_reg,
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anatop_reg->vol_bit_shift,
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anatop_reg->vol_bit_width,
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val);
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return 0;
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}
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static int anatop_get_voltage_sel(struct regulator_dev *reg)
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{
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struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
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u32 val;
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if (!anatop_reg->control_reg)
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return -ENOTSUPP;
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val = anatop_get_bits(anatop_reg->mfd,
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anatop_reg->control_reg,
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anatop_reg->vol_bit_shift,
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anatop_reg->vol_bit_width);
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return val - anatop_reg->min_bit_val;
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}
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static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
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{
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struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
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int uv;
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uv = anatop_reg->min_voltage + selector * 25000;
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dev_dbg(®->dev, "vddio = %d, selector = %u\n", uv, selector);
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return uv;
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}
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static struct regulator_ops anatop_rops = {
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.set_voltage = anatop_set_voltage,
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.get_voltage_sel = anatop_get_voltage_sel,
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.list_voltage = anatop_list_voltage,
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};
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static int __devinit anatop_regulator_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct regulator_desc *rdesc;
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struct regulator_dev *rdev;
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struct anatop_regulator *sreg;
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struct regulator_init_data *initdata;
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struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
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int ret = 0;
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initdata = of_get_regulator_init_data(dev, np);
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sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
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if (!sreg)
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return -ENOMEM;
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sreg->initdata = initdata;
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sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
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GFP_KERNEL);
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rdesc = &sreg->rdesc;
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memset(rdesc, 0, sizeof(*rdesc));
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rdesc->name = sreg->name;
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rdesc->ops = &anatop_rops;
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->owner = THIS_MODULE;
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sreg->mfd = anatopmfd;
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ret = of_property_read_u32(np, "anatop-reg-offset",
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&sreg->control_reg);
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if (ret) {
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dev_err(dev, "no anatop-reg-offset property set\n");
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goto anatop_probe_end;
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}
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ret = of_property_read_u32(np, "anatop-vol-bit-width",
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&sreg->vol_bit_width);
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if (ret) {
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dev_err(dev, "no anatop-vol-bit-width property set\n");
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goto anatop_probe_end;
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}
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ret = of_property_read_u32(np, "anatop-vol-bit-shift",
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&sreg->vol_bit_shift);
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if (ret) {
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dev_err(dev, "no anatop-vol-bit-shift property set\n");
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goto anatop_probe_end;
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}
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ret = of_property_read_u32(np, "anatop-min-bit-val",
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&sreg->min_bit_val);
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if (ret) {
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dev_err(dev, "no anatop-min-bit-val property set\n");
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goto anatop_probe_end;
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}
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ret = of_property_read_u32(np, "anatop-min-voltage",
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&sreg->min_voltage);
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if (ret) {
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dev_err(dev, "no anatop-min-voltage property set\n");
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goto anatop_probe_end;
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}
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ret = of_property_read_u32(np, "anatop-max-voltage",
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&sreg->max_voltage);
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if (ret) {
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dev_err(dev, "no anatop-max-voltage property set\n");
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goto anatop_probe_end;
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}
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rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
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/ 25000 + 1;
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/* register regulator */
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rdev = regulator_register(rdesc, dev,
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initdata, sreg, pdev->dev.of_node);
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if (IS_ERR(rdev)) {
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dev_err(dev, "failed to register %s\n",
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rdesc->name);
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ret = PTR_ERR(rdev);
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goto anatop_probe_end;
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}
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platform_set_drvdata(pdev, rdev);
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anatop_probe_end:
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if (ret)
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kfree(sreg->name);
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return ret;
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}
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static int __devexit anatop_regulator_remove(struct platform_device *pdev)
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{
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struct regulator_dev *rdev = platform_get_drvdata(pdev);
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struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
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const char *name = sreg->name;
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regulator_unregister(rdev);
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kfree(name);
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return 0;
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}
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static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
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{ .compatible = "fsl,anatop-regulator", },
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{ /* end */ }
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};
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static struct platform_driver anatop_regulator_driver = {
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.driver = {
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.name = "anatop_regulator",
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.owner = THIS_MODULE,
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.of_match_table = of_anatop_regulator_match_tbl,
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},
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.probe = anatop_regulator_probe,
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.remove = anatop_regulator_remove,
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};
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static int __init anatop_regulator_init(void)
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{
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return platform_driver_register(&anatop_regulator_driver);
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}
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postcore_initcall(anatop_regulator_init);
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static void __exit anatop_regulator_exit(void)
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{
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platform_driver_unregister(&anatop_regulator_driver);
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}
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module_exit(anatop_regulator_exit);
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MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
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"Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
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MODULE_DESCRIPTION("ANATOP Regulator driver");
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MODULE_LICENSE("GPL v2");
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