Daniel Ribeiro | 39b1772 | 2009-06-27 00:18:02 -0300 | [diff] [blame] | 1 | /* |
| 2 | * PCAP2 Regulator Driver |
| 3 | * |
| 4 | * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the |
| 8 | * Free Software Foundation; either version 2 of the License, or (at your |
| 9 | * option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/regulator/driver.h> |
| 18 | #include <linux/regulator/machine.h> |
| 19 | #include <linux/mfd/ezx-pcap.h> |
| 20 | |
| 21 | static const u16 V1_table[] = { |
| 22 | 2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275, |
| 23 | }; |
| 24 | |
| 25 | static const u16 V2_table[] = { |
| 26 | 2500, 2775, |
| 27 | }; |
| 28 | |
| 29 | static const u16 V3_table[] = { |
| 30 | 1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275, |
| 31 | }; |
| 32 | |
| 33 | static const u16 V4_table[] = { |
| 34 | 1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775, |
| 35 | }; |
| 36 | |
| 37 | static const u16 V5_table[] = { |
| 38 | 1875, 2275, 2475, 2775, |
| 39 | }; |
| 40 | |
| 41 | static const u16 V6_table[] = { |
| 42 | 2475, 2775, |
| 43 | }; |
| 44 | |
| 45 | static const u16 V7_table[] = { |
| 46 | 1875, 2775, |
| 47 | }; |
| 48 | |
| 49 | #define V8_table V4_table |
| 50 | |
| 51 | static const u16 V9_table[] = { |
| 52 | 1575, 1875, 2475, 2775, |
| 53 | }; |
| 54 | |
| 55 | static const u16 V10_table[] = { |
| 56 | 5000, |
| 57 | }; |
| 58 | |
| 59 | static const u16 VAUX1_table[] = { |
| 60 | 1875, 2475, 2775, 3000, |
| 61 | }; |
| 62 | |
| 63 | #define VAUX2_table VAUX1_table |
| 64 | |
| 65 | static const u16 VAUX3_table[] = { |
| 66 | 1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000, |
| 67 | 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, |
| 68 | }; |
| 69 | |
| 70 | static const u16 VAUX4_table[] = { |
| 71 | 1800, 1800, 3000, 5000, |
| 72 | }; |
| 73 | |
| 74 | static const u16 VSIM_table[] = { |
| 75 | 1875, 3000, |
| 76 | }; |
| 77 | |
| 78 | static const u16 VSIM2_table[] = { |
| 79 | 1875, |
| 80 | }; |
| 81 | |
| 82 | static const u16 VVIB_table[] = { |
| 83 | 1300, 1800, 2000, 3000, |
| 84 | }; |
| 85 | |
| 86 | static const u16 SW1_table[] = { |
| 87 | 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, |
| 88 | 1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250, |
| 89 | }; |
| 90 | |
| 91 | #define SW2_table SW1_table |
| 92 | |
| 93 | static const u16 SW3_table[] = { |
| 94 | 4000, 4500, 5000, 5500, |
| 95 | }; |
| 96 | |
| 97 | struct pcap_regulator { |
| 98 | const u8 reg; |
| 99 | const u8 en; |
| 100 | const u8 index; |
| 101 | const u8 stby; |
| 102 | const u8 lowpwr; |
| 103 | const u8 n_voltages; |
| 104 | const u16 *voltage_table; |
| 105 | }; |
| 106 | |
| 107 | #define NA 0xff |
| 108 | |
| 109 | #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr) \ |
| 110 | [_vreg] = { \ |
| 111 | .reg = _reg, \ |
| 112 | .en = _en, \ |
| 113 | .index = _index, \ |
| 114 | .stby = _stby, \ |
| 115 | .lowpwr = _lowpwr, \ |
| 116 | .n_voltages = ARRAY_SIZE(_vreg##_table), \ |
| 117 | .voltage_table = _vreg##_table, \ |
| 118 | } |
| 119 | |
| 120 | static struct pcap_regulator vreg_table[] = { |
| 121 | VREG_INFO(V1, PCAP_REG_VREG1, 1, 2, 18, 0), |
| 122 | VREG_INFO(V2, PCAP_REG_VREG1, 5, 6, 19, 22), |
| 123 | VREG_INFO(V3, PCAP_REG_VREG1, 7, 8, 20, 23), |
| 124 | VREG_INFO(V4, PCAP_REG_VREG1, 11, 12, 21, 24), |
| 125 | /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */ |
| 126 | VREG_INFO(V5, PCAP_REG_VREG1, 15, 16, 12, 19), |
| 127 | |
| 128 | VREG_INFO(V6, PCAP_REG_VREG2, 1, 2, 14, 20), |
| 129 | VREG_INFO(V7, PCAP_REG_VREG2, 3, 4, 15, 21), |
| 130 | VREG_INFO(V8, PCAP_REG_VREG2, 5, 6, 16, 22), |
| 131 | VREG_INFO(V9, PCAP_REG_VREG2, 9, 10, 17, 23), |
| 132 | VREG_INFO(V10, PCAP_REG_VREG2, 10, NA, 18, 24), |
| 133 | |
| 134 | VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1, 2, 22, 23), |
| 135 | /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */ |
| 136 | VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4, 5, 0, 1), |
| 137 | VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7, 8, 2, 3), |
| 138 | VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4, 5), |
| 139 | VREG_INFO(VSIM, PCAP_REG_AUXVREG, 17, 18, NA, 6), |
| 140 | VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7), |
| 141 | VREG_INFO(VVIB, PCAP_REG_AUXVREG, 19, 20, NA, NA), |
| 142 | |
| 143 | VREG_INFO(SW1, PCAP_REG_SWCTRL, 1, 2, NA, NA), |
| 144 | VREG_INFO(SW2, PCAP_REG_SWCTRL, 6, 7, NA, NA), |
| 145 | /* SW3 STBY is on PCAP_REG_AUXVREG */ |
| 146 | VREG_INFO(SW3, PCAP_REG_SWCTRL, 11, 12, 24, NA), |
| 147 | |
| 148 | /* SWxS used to control SWx voltage on standby */ |
| 149 | /* VREG_INFO(SW1S, PCAP_REG_LOWPWR, NA, 12, NA, NA), |
| 150 | VREG_INFO(SW2S, PCAP_REG_LOWPWR, NA, 20, NA, NA), */ |
| 151 | }; |
| 152 | |
| 153 | static int pcap_regulator_set_voltage(struct regulator_dev *rdev, |
| 154 | int min_uV, int max_uV) |
| 155 | { |
| 156 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 157 | void *pcap = rdev_get_drvdata(rdev); |
| 158 | int uV; |
| 159 | u8 i; |
| 160 | |
| 161 | /* the regulator doesn't support voltage switching */ |
| 162 | if (vreg->n_voltages == 1) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | for (i = 0; i < vreg->n_voltages; i++) { |
| 166 | /* For V1 the first is not the best match */ |
| 167 | if (i == 0 && rdev_get_id(rdev) == V1) |
| 168 | i = 1; |
| 169 | else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1) |
| 170 | i = 0; |
| 171 | |
| 172 | uV = vreg->voltage_table[i] * 1000; |
| 173 | if (min_uV <= uV && uV <= max_uV) |
| 174 | return ezx_pcap_set_bits(pcap, vreg->reg, |
| 175 | (vreg->n_voltages - 1) << vreg->index, |
| 176 | i << vreg->index); |
| 177 | |
| 178 | if (i == 0 && rdev_get_id(rdev) == V1) |
| 179 | i = vreg->n_voltages - 1; |
| 180 | } |
| 181 | |
| 182 | /* the requested voltage range is not supported by this regulator */ |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | |
| 186 | static int pcap_regulator_get_voltage(struct regulator_dev *rdev) |
| 187 | { |
| 188 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 189 | void *pcap = rdev_get_drvdata(rdev); |
| 190 | u32 tmp; |
| 191 | int mV; |
| 192 | |
| 193 | if (vreg->n_voltages == 1) |
| 194 | return vreg->voltage_table[0] * 1000; |
| 195 | |
| 196 | ezx_pcap_read(pcap, vreg->reg, &tmp); |
| 197 | tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1)); |
| 198 | mV = vreg->voltage_table[tmp]; |
| 199 | |
| 200 | return mV * 1000; |
| 201 | } |
| 202 | |
| 203 | static int pcap_regulator_enable(struct regulator_dev *rdev) |
| 204 | { |
| 205 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 206 | void *pcap = rdev_get_drvdata(rdev); |
| 207 | |
| 208 | if (vreg->en == NA) |
| 209 | return -EINVAL; |
| 210 | |
| 211 | return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en); |
| 212 | } |
| 213 | |
| 214 | static int pcap_regulator_disable(struct regulator_dev *rdev) |
| 215 | { |
| 216 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 217 | void *pcap = rdev_get_drvdata(rdev); |
| 218 | |
| 219 | if (vreg->en == NA) |
| 220 | return -EINVAL; |
| 221 | |
| 222 | return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0); |
| 223 | } |
| 224 | |
| 225 | static int pcap_regulator_is_enabled(struct regulator_dev *rdev) |
| 226 | { |
| 227 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 228 | void *pcap = rdev_get_drvdata(rdev); |
| 229 | u32 tmp; |
| 230 | |
| 231 | if (vreg->en == NA) |
| 232 | return -EINVAL; |
| 233 | |
| 234 | ezx_pcap_read(pcap, vreg->reg, &tmp); |
| 235 | return (tmp >> vreg->en) & 1; |
| 236 | } |
| 237 | |
| 238 | static int pcap_regulator_list_voltage(struct regulator_dev *rdev, |
| 239 | unsigned int index) |
| 240 | { |
| 241 | struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)]; |
| 242 | |
| 243 | return vreg->voltage_table[index] * 1000; |
| 244 | } |
| 245 | |
| 246 | static struct regulator_ops pcap_regulator_ops = { |
| 247 | .list_voltage = pcap_regulator_list_voltage, |
| 248 | .set_voltage = pcap_regulator_set_voltage, |
| 249 | .get_voltage = pcap_regulator_get_voltage, |
| 250 | .enable = pcap_regulator_enable, |
| 251 | .disable = pcap_regulator_disable, |
| 252 | .is_enabled = pcap_regulator_is_enabled, |
| 253 | }; |
| 254 | |
| 255 | #define VREG(_vreg) \ |
| 256 | [_vreg] = { \ |
| 257 | .name = #_vreg, \ |
| 258 | .id = _vreg, \ |
| 259 | .n_voltages = ARRAY_SIZE(_vreg##_table), \ |
| 260 | .ops = &pcap_regulator_ops, \ |
| 261 | .type = REGULATOR_VOLTAGE, \ |
| 262 | .owner = THIS_MODULE, \ |
| 263 | } |
| 264 | |
| 265 | static struct regulator_desc pcap_regulators[] = { |
| 266 | VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7), |
| 267 | VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3), |
| 268 | VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2), |
| 269 | }; |
| 270 | |
| 271 | static int __devinit pcap_regulator_probe(struct platform_device *pdev) |
| 272 | { |
| 273 | struct regulator_dev *rdev; |
Antonio Ospite | 70fde5c | 2009-08-07 23:18:41 +0200 | [diff] [blame] | 274 | void *pcap = dev_get_drvdata(pdev->dev.parent); |
Daniel Ribeiro | 39b1772 | 2009-06-27 00:18:02 -0300 | [diff] [blame] | 275 | |
| 276 | rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev, |
| 277 | pdev->dev.platform_data, pcap); |
| 278 | if (IS_ERR(rdev)) |
| 279 | return PTR_ERR(rdev); |
| 280 | |
| 281 | platform_set_drvdata(pdev, rdev); |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static int __devexit pcap_regulator_remove(struct platform_device *pdev) |
| 287 | { |
| 288 | struct regulator_dev *rdev = platform_get_drvdata(pdev); |
| 289 | |
| 290 | regulator_unregister(rdev); |
| 291 | |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | static struct platform_driver pcap_regulator_driver = { |
| 296 | .driver = { |
| 297 | .name = "pcap-regulator", |
| 298 | }, |
| 299 | .probe = pcap_regulator_probe, |
| 300 | .remove = __devexit_p(pcap_regulator_remove), |
| 301 | }; |
| 302 | |
| 303 | static int __init pcap_regulator_init(void) |
| 304 | { |
| 305 | return platform_driver_register(&pcap_regulator_driver); |
| 306 | } |
| 307 | |
| 308 | static void __exit pcap_regulator_exit(void) |
| 309 | { |
| 310 | platform_driver_unregister(&pcap_regulator_driver); |
| 311 | } |
| 312 | |
Antonio Ospite | e397e7e | 2009-08-06 16:08:52 -0700 | [diff] [blame] | 313 | subsys_initcall(pcap_regulator_init); |
Daniel Ribeiro | 39b1772 | 2009-06-27 00:18:02 -0300 | [diff] [blame] | 314 | module_exit(pcap_regulator_exit); |
| 315 | |
| 316 | MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>"); |
| 317 | MODULE_DESCRIPTION("PCAP2 Regulator Driver"); |
| 318 | MODULE_LICENSE("GPL"); |