1 /* 2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. 3 */ 4 5 /* 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21 #include <linux/slab.h> 22 #include <linux/device.h> 23 #include <linux/module.h> 24 #include <linux/mfd/syscon.h> 25 #include <linux/err.h> 26 #include <linux/io.h> 27 #include <linux/platform_device.h> 28 #include <linux/of.h> 29 #include <linux/of_address.h> 30 #include <linux/regmap.h> 31 #include <linux/regulator/driver.h> 32 #include <linux/regulator/of_regulator.h> 33 34 struct anatop_regulator { 35 const char *name; 36 u32 control_reg; 37 struct regmap *anatop; 38 int vol_bit_shift; 39 int vol_bit_width; 40 int min_bit_val; 41 int min_voltage; 42 int max_voltage; 43 struct regulator_desc rdesc; 44 struct regulator_init_data *initdata; 45 }; 46 47 static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg, 48 unsigned selector) 49 { 50 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); 51 52 if (!anatop_reg->control_reg) 53 return -ENOTSUPP; 54 55 return regulator_set_voltage_sel_regmap(reg, selector); 56 } 57 58 static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg) 59 { 60 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); 61 62 if (!anatop_reg->control_reg) 63 return -ENOTSUPP; 64 65 return regulator_get_voltage_sel_regmap(reg); 66 } 67 68 static struct regulator_ops anatop_rops = { 69 .set_voltage_sel = anatop_regmap_set_voltage_sel, 70 .get_voltage_sel = anatop_regmap_get_voltage_sel, 71 .list_voltage = regulator_list_voltage_linear, 72 .map_voltage = regulator_map_voltage_linear, 73 }; 74 75 static int anatop_regulator_probe(struct platform_device *pdev) 76 { 77 struct device *dev = &pdev->dev; 78 struct device_node *np = dev->of_node; 79 struct device_node *anatop_np; 80 struct regulator_desc *rdesc; 81 struct regulator_dev *rdev; 82 struct anatop_regulator *sreg; 83 struct regulator_init_data *initdata; 84 struct regulator_config config = { }; 85 int ret = 0; 86 87 initdata = of_get_regulator_init_data(dev, np); 88 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL); 89 if (!sreg) 90 return -ENOMEM; 91 sreg->initdata = initdata; 92 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL), 93 GFP_KERNEL); 94 rdesc = &sreg->rdesc; 95 memset(rdesc, 0, sizeof(*rdesc)); 96 rdesc->name = sreg->name; 97 rdesc->ops = &anatop_rops; 98 rdesc->type = REGULATOR_VOLTAGE; 99 rdesc->owner = THIS_MODULE; 100 101 anatop_np = of_get_parent(np); 102 if (!anatop_np) 103 return -ENODEV; 104 sreg->anatop = syscon_node_to_regmap(anatop_np); 105 of_node_put(anatop_np); 106 if (IS_ERR(sreg->anatop)) 107 return PTR_ERR(sreg->anatop); 108 109 ret = of_property_read_u32(np, "anatop-reg-offset", 110 &sreg->control_reg); 111 if (ret) { 112 dev_err(dev, "no anatop-reg-offset property set\n"); 113 goto anatop_probe_end; 114 } 115 ret = of_property_read_u32(np, "anatop-vol-bit-width", 116 &sreg->vol_bit_width); 117 if (ret) { 118 dev_err(dev, "no anatop-vol-bit-width property set\n"); 119 goto anatop_probe_end; 120 } 121 ret = of_property_read_u32(np, "anatop-vol-bit-shift", 122 &sreg->vol_bit_shift); 123 if (ret) { 124 dev_err(dev, "no anatop-vol-bit-shift property set\n"); 125 goto anatop_probe_end; 126 } 127 ret = of_property_read_u32(np, "anatop-min-bit-val", 128 &sreg->min_bit_val); 129 if (ret) { 130 dev_err(dev, "no anatop-min-bit-val property set\n"); 131 goto anatop_probe_end; 132 } 133 ret = of_property_read_u32(np, "anatop-min-voltage", 134 &sreg->min_voltage); 135 if (ret) { 136 dev_err(dev, "no anatop-min-voltage property set\n"); 137 goto anatop_probe_end; 138 } 139 ret = of_property_read_u32(np, "anatop-max-voltage", 140 &sreg->max_voltage); 141 if (ret) { 142 dev_err(dev, "no anatop-max-voltage property set\n"); 143 goto anatop_probe_end; 144 } 145 146 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1 147 + sreg->min_bit_val; 148 rdesc->min_uV = sreg->min_voltage; 149 rdesc->uV_step = 25000; 150 rdesc->linear_min_sel = sreg->min_bit_val; 151 rdesc->vsel_reg = sreg->control_reg; 152 rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) << 153 sreg->vol_bit_shift; 154 155 config.dev = &pdev->dev; 156 config.init_data = initdata; 157 config.driver_data = sreg; 158 config.of_node = pdev->dev.of_node; 159 config.regmap = sreg->anatop; 160 161 /* register regulator */ 162 rdev = regulator_register(rdesc, &config); 163 if (IS_ERR(rdev)) { 164 dev_err(dev, "failed to register %s\n", 165 rdesc->name); 166 ret = PTR_ERR(rdev); 167 goto anatop_probe_end; 168 } 169 170 platform_set_drvdata(pdev, rdev); 171 172 anatop_probe_end: 173 if (ret) 174 kfree(sreg->name); 175 176 return ret; 177 } 178 179 static int anatop_regulator_remove(struct platform_device *pdev) 180 { 181 struct regulator_dev *rdev = platform_get_drvdata(pdev); 182 struct anatop_regulator *sreg = rdev_get_drvdata(rdev); 183 const char *name = sreg->name; 184 185 regulator_unregister(rdev); 186 kfree(name); 187 188 return 0; 189 } 190 191 static struct of_device_id of_anatop_regulator_match_tbl[] = { 192 { .compatible = "fsl,anatop-regulator", }, 193 { /* end */ } 194 }; 195 196 static struct platform_driver anatop_regulator_driver = { 197 .driver = { 198 .name = "anatop_regulator", 199 .owner = THIS_MODULE, 200 .of_match_table = of_anatop_regulator_match_tbl, 201 }, 202 .probe = anatop_regulator_probe, 203 .remove = anatop_regulator_remove, 204 }; 205 206 static int __init anatop_regulator_init(void) 207 { 208 return platform_driver_register(&anatop_regulator_driver); 209 } 210 postcore_initcall(anatop_regulator_init); 211 212 static void __exit anatop_regulator_exit(void) 213 { 214 platform_driver_unregister(&anatop_regulator_driver); 215 } 216 module_exit(anatop_regulator_exit); 217 218 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, " 219 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>"); 220 MODULE_DESCRIPTION("ANATOP Regulator driver"); 221 MODULE_LICENSE("GPL v2"); 222