/* * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include struct anatop_regulator { const char *name; u32 control_reg; struct regmap *anatop; int vol_bit_shift; int vol_bit_width; int min_bit_val; int min_voltage; int max_voltage; struct regulator_desc rdesc; struct regulator_init_data *initdata; }; static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg, unsigned selector) { struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); u32 val, mask; if (!anatop_reg->control_reg) return -ENOTSUPP; val = anatop_reg->min_bit_val + selector; dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val); mask = ((1 << anatop_reg->vol_bit_width) - 1) << anatop_reg->vol_bit_shift; val <<= anatop_reg->vol_bit_shift; regmap_update_bits(anatop_reg->anatop, anatop_reg->control_reg, mask, val); return 0; } static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg) { struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); u32 val, mask; if (!anatop_reg->control_reg) return -ENOTSUPP; regmap_read(anatop_reg->anatop, anatop_reg->control_reg, &val); mask = ((1 << anatop_reg->vol_bit_width) - 1) << anatop_reg->vol_bit_shift; val = (val & mask) >> anatop_reg->vol_bit_shift; return val - anatop_reg->min_bit_val; } static struct regulator_ops anatop_rops = { .set_voltage_sel = anatop_regmap_set_voltage_sel, .get_voltage_sel = anatop_regmap_get_voltage_sel, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, }; static int __devinit anatop_regulator_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct device_node *anatop_np; struct regulator_desc *rdesc; struct regulator_dev *rdev; struct anatop_regulator *sreg; struct regulator_init_data *initdata; struct regulator_config config = { }; int ret = 0; initdata = of_get_regulator_init_data(dev, np); sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL); if (!sreg) return -ENOMEM; sreg->initdata = initdata; sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL), GFP_KERNEL); rdesc = &sreg->rdesc; memset(rdesc, 0, sizeof(*rdesc)); rdesc->name = sreg->name; rdesc->ops = &anatop_rops; rdesc->type = REGULATOR_VOLTAGE; rdesc->owner = THIS_MODULE; anatop_np = of_get_parent(np); if (!anatop_np) return -ENODEV; sreg->anatop = syscon_node_to_regmap(anatop_np); of_node_put(anatop_np); if (IS_ERR(sreg->anatop)) return PTR_ERR(sreg->anatop); ret = of_property_read_u32(np, "anatop-reg-offset", &sreg->control_reg); if (ret) { dev_err(dev, "no anatop-reg-offset property set\n"); goto anatop_probe_end; } ret = of_property_read_u32(np, "anatop-vol-bit-width", &sreg->vol_bit_width); if (ret) { dev_err(dev, "no anatop-vol-bit-width property set\n"); goto anatop_probe_end; } ret = of_property_read_u32(np, "anatop-vol-bit-shift", &sreg->vol_bit_shift); if (ret) { dev_err(dev, "no anatop-vol-bit-shift property set\n"); goto anatop_probe_end; } ret = of_property_read_u32(np, "anatop-min-bit-val", &sreg->min_bit_val); if (ret) { dev_err(dev, "no anatop-min-bit-val property set\n"); goto anatop_probe_end; } ret = of_property_read_u32(np, "anatop-min-voltage", &sreg->min_voltage); if (ret) { dev_err(dev, "no anatop-min-voltage property set\n"); goto anatop_probe_end; } ret = of_property_read_u32(np, "anatop-max-voltage", &sreg->max_voltage); if (ret) { dev_err(dev, "no anatop-max-voltage property set\n"); goto anatop_probe_end; } rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1; rdesc->min_uV = sreg->min_voltage; rdesc->uV_step = 25000; config.dev = &pdev->dev; config.init_data = initdata; config.driver_data = sreg; config.of_node = pdev->dev.of_node; /* register regulator */ rdev = regulator_register(rdesc, &config); if (IS_ERR(rdev)) { dev_err(dev, "failed to register %s\n", rdesc->name); ret = PTR_ERR(rdev); goto anatop_probe_end; } platform_set_drvdata(pdev, rdev); anatop_probe_end: if (ret) kfree(sreg->name); return ret; } static int __devexit anatop_regulator_remove(struct platform_device *pdev) { struct regulator_dev *rdev = platform_get_drvdata(pdev); struct anatop_regulator *sreg = rdev_get_drvdata(rdev); const char *name = sreg->name; regulator_unregister(rdev); kfree(name); return 0; } static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = { { .compatible = "fsl,anatop-regulator", }, { /* end */ } }; static struct platform_driver anatop_regulator_driver = { .driver = { .name = "anatop_regulator", .owner = THIS_MODULE, .of_match_table = of_anatop_regulator_match_tbl, }, .probe = anatop_regulator_probe, .remove = anatop_regulator_remove, }; static int __init anatop_regulator_init(void) { return platform_driver_register(&anatop_regulator_driver); } postcore_initcall(anatop_regulator_init); static void __exit anatop_regulator_exit(void) { platform_driver_unregister(&anatop_regulator_driver); } module_exit(anatop_regulator_exit); MODULE_AUTHOR("Nancy Chen , " "Ying-Chun Liu (PaulLiu) "); MODULE_DESCRIPTION("ANATOP Regulator driver"); MODULE_LICENSE("GPL v2");