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 u32 val, mask; 52 53 if (!anatop_reg->control_reg) 54 return -ENOTSUPP; 55 56 val = anatop_reg->min_bit_val + selector; 57 dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val); 58 mask = ((1 << anatop_reg->vol_bit_width) - 1) << 59 anatop_reg->vol_bit_shift; 60 val <<= anatop_reg->vol_bit_shift; 61 regmap_update_bits(anatop_reg->anatop, anatop_reg->control_reg, 62 mask, val); 63 64 return 0; 65 } 66 67 static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg) 68 { 69 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); 70 u32 val, mask; 71 72 if (!anatop_reg->control_reg) 73 return -ENOTSUPP; 74 75 regmap_read(anatop_reg->anatop, anatop_reg->control_reg, &val); 76 mask = ((1 << anatop_reg->vol_bit_width) - 1) << 77 anatop_reg->vol_bit_shift; 78 val = (val & mask) >> anatop_reg->vol_bit_shift; 79 80 return val - anatop_reg->min_bit_val; 81 } 82 83 static struct regulator_ops anatop_rops = { 84 .set_voltage_sel = anatop_regmap_set_voltage_sel, 85 .get_voltage_sel = anatop_regmap_get_voltage_sel, 86 .list_voltage = regulator_list_voltage_linear, 87 .map_voltage = regulator_map_voltage_linear, 88 }; 89 90 static int __devinit anatop_regulator_probe(struct platform_device *pdev) 91 { 92 struct device *dev = &pdev->dev; 93 struct device_node *np = dev->of_node; 94 struct device_node *anatop_np; 95 struct regulator_desc *rdesc; 96 struct regulator_dev *rdev; 97 struct anatop_regulator *sreg; 98 struct regulator_init_data *initdata; 99 struct regulator_config config = { }; 100 int ret = 0; 101 102 initdata = of_get_regulator_init_data(dev, np); 103 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL); 104 if (!sreg) 105 return -ENOMEM; 106 sreg->initdata = initdata; 107 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL), 108 GFP_KERNEL); 109 rdesc = &sreg->rdesc; 110 memset(rdesc, 0, sizeof(*rdesc)); 111 rdesc->name = sreg->name; 112 rdesc->ops = &anatop_rops; 113 rdesc->type = REGULATOR_VOLTAGE; 114 rdesc->owner = THIS_MODULE; 115 116 anatop_np = of_get_parent(np); 117 if (!anatop_np) 118 return -ENODEV; 119 sreg->anatop = syscon_node_to_regmap(anatop_np); 120 of_node_put(anatop_np); 121 if (IS_ERR(sreg->anatop)) 122 return PTR_ERR(sreg->anatop); 123 124 ret = of_property_read_u32(np, "anatop-reg-offset", 125 &sreg->control_reg); 126 if (ret) { 127 dev_err(dev, "no anatop-reg-offset property set\n"); 128 goto anatop_probe_end; 129 } 130 ret = of_property_read_u32(np, "anatop-vol-bit-width", 131 &sreg->vol_bit_width); 132 if (ret) { 133 dev_err(dev, "no anatop-vol-bit-width property set\n"); 134 goto anatop_probe_end; 135 } 136 ret = of_property_read_u32(np, "anatop-vol-bit-shift", 137 &sreg->vol_bit_shift); 138 if (ret) { 139 dev_err(dev, "no anatop-vol-bit-shift property set\n"); 140 goto anatop_probe_end; 141 } 142 ret = of_property_read_u32(np, "anatop-min-bit-val", 143 &sreg->min_bit_val); 144 if (ret) { 145 dev_err(dev, "no anatop-min-bit-val property set\n"); 146 goto anatop_probe_end; 147 } 148 ret = of_property_read_u32(np, "anatop-min-voltage", 149 &sreg->min_voltage); 150 if (ret) { 151 dev_err(dev, "no anatop-min-voltage property set\n"); 152 goto anatop_probe_end; 153 } 154 ret = of_property_read_u32(np, "anatop-max-voltage", 155 &sreg->max_voltage); 156 if (ret) { 157 dev_err(dev, "no anatop-max-voltage property set\n"); 158 goto anatop_probe_end; 159 } 160 161 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) 162 / 25000 + 1; 163 rdesc->min_uV = sreg->min_voltage; 164 rdesc->uV_step = 25000; 165 166 config.dev = &pdev->dev; 167 config.init_data = initdata; 168 config.driver_data = sreg; 169 config.of_node = pdev->dev.of_node; 170 171 /* register regulator */ 172 rdev = regulator_register(rdesc, &config); 173 if (IS_ERR(rdev)) { 174 dev_err(dev, "failed to register %s\n", 175 rdesc->name); 176 ret = PTR_ERR(rdev); 177 goto anatop_probe_end; 178 } 179 180 platform_set_drvdata(pdev, rdev); 181 182 anatop_probe_end: 183 if (ret) 184 kfree(sreg->name); 185 186 return ret; 187 } 188 189 static int __devexit anatop_regulator_remove(struct platform_device *pdev) 190 { 191 struct regulator_dev *rdev = platform_get_drvdata(pdev); 192 struct anatop_regulator *sreg = rdev_get_drvdata(rdev); 193 const char *name = sreg->name; 194 195 regulator_unregister(rdev); 196 kfree(name); 197 198 return 0; 199 } 200 201 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = { 202 { .compatible = "fsl,anatop-regulator", }, 203 { /* end */ } 204 }; 205 206 static struct platform_driver anatop_regulator_driver = { 207 .driver = { 208 .name = "anatop_regulator", 209 .owner = THIS_MODULE, 210 .of_match_table = of_anatop_regulator_match_tbl, 211 }, 212 .probe = anatop_regulator_probe, 213 .remove = __devexit_p(anatop_regulator_remove), 214 }; 215 216 static int __init anatop_regulator_init(void) 217 { 218 return platform_driver_register(&anatop_regulator_driver); 219 } 220 postcore_initcall(anatop_regulator_init); 221 222 static void __exit anatop_regulator_exit(void) 223 { 224 platform_driver_unregister(&anatop_regulator_driver); 225 } 226 module_exit(anatop_regulator_exit); 227 228 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, " 229 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>"); 230 MODULE_DESCRIPTION("ANATOP Regulator driver"); 231 MODULE_LICENSE("GPL v2"); 232