Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 1 | /* |
| 2 | * max8660.c -- Voltage regulation for the Maxim 8660/8661 |
| 3 | * |
| 4 | * based on max1586.c and wm8400-regulator.c |
| 5 | * |
| 6 | * Copyright (C) 2009 Wolfram Sang, Pengutronix e.K. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the Free |
| 10 | * Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along with |
| 18 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 19 | * Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | * |
| 21 | * Some info: |
| 22 | * |
| 23 | * Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf |
| 24 | * |
| 25 | * This chip is a bit nasty because it is a write-only device. Thus, the driver |
| 26 | * uses shadow registers to keep track of its values. The main problem appears |
| 27 | * to be the initialization: When Linux boots up, we cannot know if the chip is |
| 28 | * in the default state or not, so we would have to pass such information in |
| 29 | * platform_data. As this adds a bit of complexity to the driver, this is left |
| 30 | * out for now until it is really needed. |
| 31 | * |
| 32 | * [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2. |
| 33 | * |
| 34 | * If the driver is feature complete, it might be worth to check if one set of |
| 35 | * functions for V3-V7 is sufficient. For maximum flexibility during |
| 36 | * development, they are separated for now. |
| 37 | * |
| 38 | */ |
| 39 | |
| 40 | #include <linux/module.h> |
| 41 | #include <linux/err.h> |
| 42 | #include <linux/i2c.h> |
| 43 | #include <linux/platform_device.h> |
| 44 | #include <linux/regulator/driver.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 45 | #include <linux/slab.h> |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 46 | #include <linux/regulator/max8660.h> |
| 47 | |
| 48 | #define MAX8660_DCDC_MIN_UV 725000 |
| 49 | #define MAX8660_DCDC_MAX_UV 1800000 |
| 50 | #define MAX8660_DCDC_STEP 25000 |
| 51 | #define MAX8660_DCDC_MAX_SEL 0x2b |
| 52 | |
| 53 | #define MAX8660_LDO5_MIN_UV 1700000 |
| 54 | #define MAX8660_LDO5_MAX_UV 2000000 |
| 55 | #define MAX8660_LDO5_STEP 25000 |
| 56 | #define MAX8660_LDO5_MAX_SEL 0x0c |
| 57 | |
| 58 | #define MAX8660_LDO67_MIN_UV 1800000 |
| 59 | #define MAX8660_LDO67_MAX_UV 3300000 |
| 60 | #define MAX8660_LDO67_STEP 100000 |
| 61 | #define MAX8660_LDO67_MAX_SEL 0x0f |
| 62 | |
| 63 | enum { |
| 64 | MAX8660_OVER1, |
| 65 | MAX8660_OVER2, |
| 66 | MAX8660_VCC1, |
| 67 | MAX8660_ADTV1, |
| 68 | MAX8660_ADTV2, |
| 69 | MAX8660_SDTV1, |
| 70 | MAX8660_SDTV2, |
| 71 | MAX8660_MDTV1, |
| 72 | MAX8660_MDTV2, |
| 73 | MAX8660_L12VCR, |
| 74 | MAX8660_FPWM, |
| 75 | MAX8660_N_REGS, /* not a real register */ |
| 76 | }; |
| 77 | |
| 78 | struct max8660 { |
| 79 | struct i2c_client *client; |
| 80 | u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */ |
| 81 | struct regulator_dev *rdev[]; |
| 82 | }; |
| 83 | |
| 84 | static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val) |
| 85 | { |
| 86 | static const u8 max8660_addresses[MAX8660_N_REGS] = |
| 87 | { 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 }; |
| 88 | |
| 89 | int ret; |
| 90 | u8 reg_val = (max8660->shadow_regs[reg] & mask) | val; |
| 91 | dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n", |
| 92 | max8660_addresses[reg], reg_val); |
| 93 | |
| 94 | ret = i2c_smbus_write_byte_data(max8660->client, |
| 95 | max8660_addresses[reg], reg_val); |
| 96 | if (ret == 0) |
| 97 | max8660->shadow_regs[reg] = reg_val; |
| 98 | |
| 99 | return ret; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | /* |
| 104 | * DCDC functions |
| 105 | */ |
| 106 | |
| 107 | static int max8660_dcdc_is_enabled(struct regulator_dev *rdev) |
| 108 | { |
| 109 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 110 | u8 val = max8660->shadow_regs[MAX8660_OVER1]; |
| 111 | u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4; |
| 112 | return !!(val & mask); |
| 113 | } |
| 114 | |
| 115 | static int max8660_dcdc_enable(struct regulator_dev *rdev) |
| 116 | { |
| 117 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 118 | u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4; |
| 119 | return max8660_write(max8660, MAX8660_OVER1, 0xff, bit); |
| 120 | } |
| 121 | |
| 122 | static int max8660_dcdc_disable(struct regulator_dev *rdev) |
| 123 | { |
| 124 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 125 | u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4; |
| 126 | return max8660_write(max8660, MAX8660_OVER1, mask, 0); |
| 127 | } |
| 128 | |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 129 | static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 130 | { |
| 131 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 132 | |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 133 | u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2; |
| 134 | u8 selector = max8660->shadow_regs[reg]; |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 135 | return selector; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 136 | } |
| 137 | |
Mark Brown | 3a93f2a | 2010-11-10 14:38:29 +0000 | [diff] [blame] | 138 | static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV, |
| 139 | unsigned int *s) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 140 | { |
| 141 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 142 | u8 reg, selector, bits; |
| 143 | int ret; |
| 144 | |
| 145 | if (min_uV < MAX8660_DCDC_MIN_UV || min_uV > MAX8660_DCDC_MAX_UV) |
| 146 | return -EINVAL; |
| 147 | if (max_uV < MAX8660_DCDC_MIN_UV || max_uV > MAX8660_DCDC_MAX_UV) |
| 148 | return -EINVAL; |
| 149 | |
Axel Lin | ab353c2 | 2012-03-02 16:23:39 +0800 | [diff] [blame] | 150 | selector = DIV_ROUND_UP(min_uV - MAX8660_DCDC_MIN_UV, |
| 151 | MAX8660_DCDC_STEP); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 152 | |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 153 | ret = regulator_list_voltage_linear(rdev, selector); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 154 | if (ret < 0 || ret > max_uV) |
| 155 | return -EINVAL; |
| 156 | |
Axel Lin | ab353c2 | 2012-03-02 16:23:39 +0800 | [diff] [blame] | 157 | *s = selector; |
| 158 | |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 159 | reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2; |
| 160 | ret = max8660_write(max8660, reg, 0, selector); |
| 161 | if (ret) |
| 162 | return ret; |
| 163 | |
| 164 | /* Select target voltage register and activate regulation */ |
| 165 | bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30; |
| 166 | return max8660_write(max8660, MAX8660_VCC1, 0xff, bits); |
| 167 | } |
| 168 | |
| 169 | static struct regulator_ops max8660_dcdc_ops = { |
| 170 | .is_enabled = max8660_dcdc_is_enabled, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 171 | .list_voltage = regulator_list_voltage_linear, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 172 | .set_voltage = max8660_dcdc_set, |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 173 | .get_voltage_sel = max8660_dcdc_get_voltage_sel, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 174 | }; |
| 175 | |
| 176 | |
| 177 | /* |
| 178 | * LDO5 functions |
| 179 | */ |
| 180 | |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 181 | static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 182 | { |
| 183 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 184 | |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 185 | u8 selector = max8660->shadow_regs[MAX8660_MDTV2]; |
| 186 | return selector; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 187 | } |
| 188 | |
Mark Brown | 3a93f2a | 2010-11-10 14:38:29 +0000 | [diff] [blame] | 189 | static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV, |
| 190 | unsigned int *s) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 191 | { |
| 192 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 193 | u8 selector; |
| 194 | int ret; |
| 195 | |
| 196 | if (min_uV < MAX8660_LDO5_MIN_UV || min_uV > MAX8660_LDO5_MAX_UV) |
| 197 | return -EINVAL; |
| 198 | if (max_uV < MAX8660_LDO5_MIN_UV || max_uV > MAX8660_LDO5_MAX_UV) |
| 199 | return -EINVAL; |
| 200 | |
Axel Lin | ab353c2 | 2012-03-02 16:23:39 +0800 | [diff] [blame] | 201 | selector = DIV_ROUND_UP(min_uV - MAX8660_LDO5_MIN_UV, |
| 202 | MAX8660_LDO5_STEP); |
| 203 | |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 204 | ret = regulator_list_voltage_linear(rdev, selector); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 205 | if (ret < 0 || ret > max_uV) |
| 206 | return -EINVAL; |
| 207 | |
Mark Brown | 3a93f2a | 2010-11-10 14:38:29 +0000 | [diff] [blame] | 208 | *s = selector; |
| 209 | |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 210 | ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector); |
| 211 | if (ret) |
| 212 | return ret; |
| 213 | |
| 214 | /* Select target voltage register and activate regulation */ |
| 215 | return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0); |
| 216 | } |
| 217 | |
| 218 | static struct regulator_ops max8660_ldo5_ops = { |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 219 | .list_voltage = regulator_list_voltage_linear, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 220 | .set_voltage = max8660_ldo5_set, |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 221 | .get_voltage_sel = max8660_ldo5_get_voltage_sel, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 222 | }; |
| 223 | |
| 224 | |
| 225 | /* |
| 226 | * LDO67 functions |
| 227 | */ |
| 228 | |
| 229 | static int max8660_ldo67_is_enabled(struct regulator_dev *rdev) |
| 230 | { |
| 231 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 232 | u8 val = max8660->shadow_regs[MAX8660_OVER2]; |
| 233 | u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4; |
| 234 | return !!(val & mask); |
| 235 | } |
| 236 | |
| 237 | static int max8660_ldo67_enable(struct regulator_dev *rdev) |
| 238 | { |
| 239 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 240 | u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4; |
| 241 | return max8660_write(max8660, MAX8660_OVER2, 0xff, bit); |
| 242 | } |
| 243 | |
| 244 | static int max8660_ldo67_disable(struct regulator_dev *rdev) |
| 245 | { |
| 246 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 247 | u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4; |
| 248 | return max8660_write(max8660, MAX8660_OVER2, mask, 0); |
| 249 | } |
| 250 | |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 251 | static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 252 | { |
| 253 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 254 | |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 255 | u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4; |
| 256 | u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf; |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 257 | return selector; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 258 | } |
| 259 | |
Mark Brown | 3a93f2a | 2010-11-10 14:38:29 +0000 | [diff] [blame] | 260 | static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV, |
| 261 | int max_uV, unsigned int *s) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 262 | { |
| 263 | struct max8660 *max8660 = rdev_get_drvdata(rdev); |
| 264 | u8 selector; |
| 265 | int ret; |
| 266 | |
| 267 | if (min_uV < MAX8660_LDO67_MIN_UV || min_uV > MAX8660_LDO67_MAX_UV) |
| 268 | return -EINVAL; |
| 269 | if (max_uV < MAX8660_LDO67_MIN_UV || max_uV > MAX8660_LDO67_MAX_UV) |
| 270 | return -EINVAL; |
| 271 | |
Axel Lin | ab353c2 | 2012-03-02 16:23:39 +0800 | [diff] [blame] | 272 | selector = DIV_ROUND_UP(min_uV - MAX8660_LDO67_MIN_UV, |
| 273 | MAX8660_LDO67_STEP); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 274 | |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 275 | ret = regulator_list_voltage_linear(rdev, selector); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 276 | if (ret < 0 || ret > max_uV) |
| 277 | return -EINVAL; |
| 278 | |
Mark Brown | 3a93f2a | 2010-11-10 14:38:29 +0000 | [diff] [blame] | 279 | *s = selector; |
| 280 | |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 281 | if (rdev_get_id(rdev) == MAX8660_V6) |
| 282 | return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector); |
| 283 | else |
| 284 | return max8660_write(max8660, MAX8660_L12VCR, 0x0f, selector << 4); |
| 285 | } |
| 286 | |
| 287 | static struct regulator_ops max8660_ldo67_ops = { |
| 288 | .is_enabled = max8660_ldo67_is_enabled, |
| 289 | .enable = max8660_ldo67_enable, |
| 290 | .disable = max8660_ldo67_disable, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 291 | .list_voltage = regulator_list_voltage_linear, |
Axel Lin | 9392c4f | 2012-05-15 21:42:12 +0800 | [diff] [blame^] | 292 | .get_voltage_sel = max8660_ldo67_get_voltage_sel, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 293 | .set_voltage = max8660_ldo67_set, |
| 294 | }; |
| 295 | |
Axel Lin | 621adb3 | 2012-04-06 08:26:59 +0800 | [diff] [blame] | 296 | static const struct regulator_desc max8660_reg[] = { |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 297 | { |
| 298 | .name = "V3(DCDC)", |
| 299 | .id = MAX8660_V3, |
| 300 | .ops = &max8660_dcdc_ops, |
| 301 | .type = REGULATOR_VOLTAGE, |
| 302 | .n_voltages = MAX8660_DCDC_MAX_SEL + 1, |
| 303 | .owner = THIS_MODULE, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 304 | .min_uV = MAX8660_DCDC_MIN_UV, |
| 305 | .uV_step = MAX8660_DCDC_STEP, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 306 | }, |
| 307 | { |
| 308 | .name = "V4(DCDC)", |
| 309 | .id = MAX8660_V4, |
| 310 | .ops = &max8660_dcdc_ops, |
| 311 | .type = REGULATOR_VOLTAGE, |
| 312 | .n_voltages = MAX8660_DCDC_MAX_SEL + 1, |
| 313 | .owner = THIS_MODULE, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 314 | .min_uV = MAX8660_DCDC_MIN_UV, |
| 315 | .uV_step = MAX8660_DCDC_STEP, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 316 | }, |
| 317 | { |
| 318 | .name = "V5(LDO)", |
| 319 | .id = MAX8660_V5, |
| 320 | .ops = &max8660_ldo5_ops, |
| 321 | .type = REGULATOR_VOLTAGE, |
| 322 | .n_voltages = MAX8660_LDO5_MAX_SEL + 1, |
| 323 | .owner = THIS_MODULE, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 324 | .min_uV = MAX8660_LDO5_MIN_UV, |
| 325 | .uV_step = MAX8660_LDO5_STEP, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 326 | }, |
| 327 | { |
| 328 | .name = "V6(LDO)", |
| 329 | .id = MAX8660_V6, |
| 330 | .ops = &max8660_ldo67_ops, |
| 331 | .type = REGULATOR_VOLTAGE, |
| 332 | .n_voltages = MAX8660_LDO67_MAX_SEL + 1, |
| 333 | .owner = THIS_MODULE, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 334 | .min_uV = MAX8660_LDO67_MIN_UV, |
| 335 | .uV_step = MAX8660_LDO67_STEP, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 336 | }, |
| 337 | { |
| 338 | .name = "V7(LDO)", |
| 339 | .id = MAX8660_V7, |
| 340 | .ops = &max8660_ldo67_ops, |
| 341 | .type = REGULATOR_VOLTAGE, |
| 342 | .n_voltages = MAX8660_LDO67_MAX_SEL + 1, |
| 343 | .owner = THIS_MODULE, |
Axel Lin | 134d34a | 2012-05-15 21:41:18 +0800 | [diff] [blame] | 344 | .min_uV = MAX8660_LDO67_MIN_UV, |
| 345 | .uV_step = MAX8660_LDO67_STEP, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 346 | }, |
| 347 | }; |
| 348 | |
Dmitry Torokhov | 308f100 | 2010-02-23 23:38:28 -0800 | [diff] [blame] | 349 | static int __devinit max8660_probe(struct i2c_client *client, |
| 350 | const struct i2c_device_id *i2c_id) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 351 | { |
| 352 | struct regulator_dev **rdev; |
| 353 | struct max8660_platform_data *pdata = client->dev.platform_data; |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 354 | struct regulator_config config = { }; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 355 | struct max8660 *max8660; |
| 356 | int boot_on, i, id, ret = -EINVAL; |
| 357 | |
| 358 | if (pdata->num_subdevs > MAX8660_V_END) { |
Dmitry Torokhov | 308f100 | 2010-02-23 23:38:28 -0800 | [diff] [blame] | 359 | dev_err(&client->dev, "Too many regulators found!\n"); |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 360 | return -EINVAL; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 361 | } |
| 362 | |
Axel Lin | 575f690 | 2012-04-17 18:06:50 +0800 | [diff] [blame] | 363 | max8660 = devm_kzalloc(&client->dev, sizeof(struct max8660) + |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 364 | sizeof(struct regulator_dev *) * MAX8660_V_END, |
| 365 | GFP_KERNEL); |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 366 | if (!max8660) |
| 367 | return -ENOMEM; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 368 | |
| 369 | max8660->client = client; |
| 370 | rdev = max8660->rdev; |
| 371 | |
| 372 | if (pdata->en34_is_high) { |
| 373 | /* Simulate always on */ |
| 374 | max8660->shadow_regs[MAX8660_OVER1] = 5; |
| 375 | } else { |
| 376 | /* Otherwise devices can be toggled via software */ |
| 377 | max8660_dcdc_ops.enable = max8660_dcdc_enable; |
| 378 | max8660_dcdc_ops.disable = max8660_dcdc_disable; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * First, set up shadow registers to prevent glitches. As some |
| 383 | * registers are shared between regulators, everything must be properly |
| 384 | * set up for all regulators in advance. |
| 385 | */ |
| 386 | max8660->shadow_regs[MAX8660_ADTV1] = |
| 387 | max8660->shadow_regs[MAX8660_ADTV2] = |
| 388 | max8660->shadow_regs[MAX8660_SDTV1] = |
| 389 | max8660->shadow_regs[MAX8660_SDTV2] = 0x1b; |
| 390 | max8660->shadow_regs[MAX8660_MDTV1] = |
| 391 | max8660->shadow_regs[MAX8660_MDTV2] = 0x04; |
| 392 | |
| 393 | for (i = 0; i < pdata->num_subdevs; i++) { |
| 394 | |
| 395 | if (!pdata->subdevs[i].platform_data) |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 396 | goto err_out; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 397 | |
| 398 | boot_on = pdata->subdevs[i].platform_data->constraints.boot_on; |
| 399 | |
| 400 | switch (pdata->subdevs[i].id) { |
| 401 | case MAX8660_V3: |
| 402 | if (boot_on) |
| 403 | max8660->shadow_regs[MAX8660_OVER1] |= 1; |
| 404 | break; |
| 405 | |
| 406 | case MAX8660_V4: |
| 407 | if (boot_on) |
| 408 | max8660->shadow_regs[MAX8660_OVER1] |= 4; |
| 409 | break; |
| 410 | |
| 411 | case MAX8660_V5: |
| 412 | break; |
| 413 | |
| 414 | case MAX8660_V6: |
| 415 | if (boot_on) |
| 416 | max8660->shadow_regs[MAX8660_OVER2] |= 2; |
| 417 | break; |
| 418 | |
| 419 | case MAX8660_V7: |
| 420 | if (!strcmp(i2c_id->name, "max8661")) { |
| 421 | dev_err(&client->dev, "Regulator not on this chip!\n"); |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 422 | goto err_out; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | if (boot_on) |
| 426 | max8660->shadow_regs[MAX8660_OVER2] |= 4; |
| 427 | break; |
| 428 | |
| 429 | default: |
| 430 | dev_err(&client->dev, "invalid regulator %s\n", |
| 431 | pdata->subdevs[i].name); |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 432 | goto err_out; |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 433 | } |
| 434 | } |
| 435 | |
| 436 | /* Finally register devices */ |
| 437 | for (i = 0; i < pdata->num_subdevs; i++) { |
| 438 | |
| 439 | id = pdata->subdevs[i].id; |
| 440 | |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 441 | config.dev = &client->dev; |
| 442 | config.init_data = pdata->subdevs[i].platform_data; |
| 443 | config.driver_data = max8660; |
| 444 | |
| 445 | rdev[i] = regulator_register(&max8660_reg[id], &config); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 446 | if (IS_ERR(rdev[i])) { |
| 447 | ret = PTR_ERR(rdev[i]); |
| 448 | dev_err(&client->dev, "failed to register %s\n", |
| 449 | max8660_reg[id].name); |
| 450 | goto err_unregister; |
| 451 | } |
| 452 | } |
| 453 | |
Axel Lin | 53a4bef | 2010-08-06 13:35:27 +0800 | [diff] [blame] | 454 | i2c_set_clientdata(client, max8660); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 455 | return 0; |
| 456 | |
| 457 | err_unregister: |
| 458 | while (--i >= 0) |
| 459 | regulator_unregister(rdev[i]); |
Axel Lin | 4d26f7d | 2012-04-11 23:08:27 +0800 | [diff] [blame] | 460 | err_out: |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 461 | return ret; |
| 462 | } |
| 463 | |
Dmitry Torokhov | 308f100 | 2010-02-23 23:38:28 -0800 | [diff] [blame] | 464 | static int __devexit max8660_remove(struct i2c_client *client) |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 465 | { |
Axel Lin | 53a4bef | 2010-08-06 13:35:27 +0800 | [diff] [blame] | 466 | struct max8660 *max8660 = i2c_get_clientdata(client); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 467 | int i; |
| 468 | |
| 469 | for (i = 0; i < MAX8660_V_END; i++) |
Axel Lin | 53a4bef | 2010-08-06 13:35:27 +0800 | [diff] [blame] | 470 | if (max8660->rdev[i]) |
| 471 | regulator_unregister(max8660->rdev[i]); |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | static const struct i2c_device_id max8660_id[] = { |
| 476 | { "max8660", 0 }, |
| 477 | { "max8661", 0 }, |
| 478 | { } |
| 479 | }; |
| 480 | MODULE_DEVICE_TABLE(i2c, max8660_id); |
| 481 | |
| 482 | static struct i2c_driver max8660_driver = { |
| 483 | .probe = max8660_probe, |
Dmitry Torokhov | 308f100 | 2010-02-23 23:38:28 -0800 | [diff] [blame] | 484 | .remove = __devexit_p(max8660_remove), |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 485 | .driver = { |
| 486 | .name = "max8660", |
Dmitry Torokhov | 308f100 | 2010-02-23 23:38:28 -0800 | [diff] [blame] | 487 | .owner = THIS_MODULE, |
Wolfram Sang | 27f37e4 | 2009-09-25 09:39:26 +0200 | [diff] [blame] | 488 | }, |
| 489 | .id_table = max8660_id, |
| 490 | }; |
| 491 | |
| 492 | static int __init max8660_init(void) |
| 493 | { |
| 494 | return i2c_add_driver(&max8660_driver); |
| 495 | } |
| 496 | subsys_initcall(max8660_init); |
| 497 | |
| 498 | static void __exit max8660_exit(void) |
| 499 | { |
| 500 | i2c_del_driver(&max8660_driver); |
| 501 | } |
| 502 | module_exit(max8660_exit); |
| 503 | |
| 504 | /* Module information */ |
| 505 | MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver"); |
| 506 | MODULE_AUTHOR("Wolfram Sang"); |
| 507 | MODULE_LICENSE("GPL v2"); |