2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the version 2 of the GNU General Public License as
9 * published by the Free Software Foundation
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/mfd/as3711.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/slab.h>
21 struct as3711_regulator_info {
22 struct regulator_desc desc;
26 struct as3711_regulator {
27 struct as3711_regulator_info *reg_info;
28 struct regulator_dev *rdev;
31 static int as3711_list_voltage_sd(struct regulator_dev *rdev,
32 unsigned int selector)
34 if (selector >= rdev->desc->n_voltages)
40 return 600000 + selector * 12500;
42 return 1400000 + (selector - 0x40) * 25000;
43 return 2600000 + (selector - 0x70) * 50000;
46 static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
47 unsigned int selector)
49 if (selector >= rdev->desc->n_voltages)
53 return 1200000 + selector * 50000;
54 return 1800000 + (selector - 0x10) * 100000;
57 static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
58 unsigned int selector)
60 if (selector >= rdev->desc->n_voltages ||
61 (selector > 0x10 && selector < 0x20))
65 return 900000 + selector * 50000;
66 return 1750000 + (selector - 0x20) * 50000;
69 static int as3711_bound_check(struct regulator_dev *rdev,
70 int *min_uV, int *max_uV)
72 struct as3711_regulator *reg = rdev_get_drvdata(rdev);
73 struct as3711_regulator_info *info = reg->reg_info;
75 dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
76 *min_uV, rdev->desc->min_uV, info->max_uV);
78 if (*max_uV < *min_uV ||
79 *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV)
82 if (rdev->desc->n_voltages == 1)
85 if (*max_uV > info->max_uV)
86 *max_uV = info->max_uV;
88 if (*min_uV < rdev->desc->min_uV)
89 *min_uV = rdev->desc->min_uV;
94 static int as3711_sel_check(int min, int max, int bottom, int step)
98 /* Round up min, when dividing: keeps us within the range */
99 ret = (min - bottom + step - 1) / step;
100 voltage = ret * step + bottom;
101 pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
102 min, max, bottom, step, ret);
105 * Try 1 down. It will take us below min, but as long we stay
106 * above bottom, we're fine.
109 voltage = ret * step + bottom;
110 if (voltage < bottom)
116 static int as3711_map_voltage_sd(struct regulator_dev *rdev,
117 int min_uV, int max_uV)
121 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
125 if (min_uV <= 1400000)
126 return as3711_sel_check(min_uV, max_uV, 600000, 12500);
128 if (min_uV <= 2600000)
129 return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;
131 return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
135 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
136 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
138 * NORMAL: low_noise=1
142 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
144 unsigned int fast_bit = rdev->desc->enable_mask,
145 low_noise_bit = fast_bit << 4;
149 case REGULATOR_MODE_FAST:
150 val = fast_bit | low_noise_bit;
152 case REGULATOR_MODE_NORMAL:
155 case REGULATOR_MODE_IDLE:
162 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
163 low_noise_bit | fast_bit, val);
166 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
168 unsigned int fast_bit = rdev->desc->enable_mask,
169 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
171 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
176 if ((val & mask) == mask)
177 return REGULATOR_MODE_FAST;
179 if ((val & mask) == low_noise_bit)
180 return REGULATOR_MODE_NORMAL;
183 return REGULATOR_MODE_IDLE;
188 static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
189 int min_uV, int max_uV)
193 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
197 if (min_uV <= 1800000)
198 return as3711_sel_check(min_uV, max_uV, 1200000, 50000);
200 return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
203 static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
204 int min_uV, int max_uV)
208 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
212 if (min_uV <= 1700000)
213 return as3711_sel_check(min_uV, max_uV, 900000, 50000);
215 return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
218 static struct regulator_ops as3711_sd_ops = {
219 .is_enabled = regulator_is_enabled_regmap,
220 .enable = regulator_enable_regmap,
221 .disable = regulator_disable_regmap,
222 .get_voltage_sel = regulator_get_voltage_sel_regmap,
223 .set_voltage_sel = regulator_set_voltage_sel_regmap,
224 .list_voltage = as3711_list_voltage_sd,
225 .map_voltage = as3711_map_voltage_sd,
226 .get_mode = as3711_get_mode_sd,
227 .set_mode = as3711_set_mode_sd,
230 static struct regulator_ops as3711_aldo_ops = {
231 .is_enabled = regulator_is_enabled_regmap,
232 .enable = regulator_enable_regmap,
233 .disable = regulator_disable_regmap,
234 .get_voltage_sel = regulator_get_voltage_sel_regmap,
235 .set_voltage_sel = regulator_set_voltage_sel_regmap,
236 .list_voltage = as3711_list_voltage_aldo,
237 .map_voltage = as3711_map_voltage_aldo,
240 static struct regulator_ops as3711_dldo_ops = {
241 .is_enabled = regulator_is_enabled_regmap,
242 .enable = regulator_enable_regmap,
243 .disable = regulator_disable_regmap,
244 .get_voltage_sel = regulator_get_voltage_sel_regmap,
245 .set_voltage_sel = regulator_set_voltage_sel_regmap,
246 .list_voltage = as3711_list_voltage_dldo,
247 .map_voltage = as3711_map_voltage_dldo,
250 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \
251 [AS3711_REGULATOR_ ## _id] = { \
253 .name = "as3711-regulator-" # _id, \
254 .id = AS3711_REGULATOR_ ## _id, \
255 .n_voltages = (_vmask + 1), \
256 .ops = &as3711_ ## _sfx ## _ops, \
257 .type = REGULATOR_VOLTAGE, \
258 .owner = THIS_MODULE, \
259 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
260 .vsel_mask = _vmask << _vshift, \
261 .enable_reg = AS3711_ ## _en_reg, \
262 .enable_mask = BIT(_en_bit), \
268 static struct as3711_regulator_info as3711_reg_info[] = {
269 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
270 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
271 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
272 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
273 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
274 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
275 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
276 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
277 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
278 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
279 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
280 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
281 /* StepUp output voltage depends on supplying regulator */
284 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
286 static int as3711_regulator_probe(struct platform_device *pdev)
288 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
289 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
290 struct regulator_init_data *reg_data;
291 struct regulator_config config = {.dev = &pdev->dev,};
292 struct as3711_regulator *reg = NULL;
293 struct as3711_regulator *regs;
294 struct regulator_dev *rdev;
295 struct as3711_regulator_info *ri;
300 dev_dbg(&pdev->dev, "No platform data...\n");
302 regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
303 sizeof(struct as3711_regulator), GFP_KERNEL);
305 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
309 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
310 reg_data = pdata ? pdata->init_data[id] : NULL;
312 /* No need to register if there is no regulator data */
319 config.init_data = reg_data;
320 config.driver_data = reg;
321 config.regmap = as3711->regmap;
323 rdev = regulator_register(&ri->desc, &config);
325 dev_err(&pdev->dev, "Failed to register regulator %s\n",
332 platform_set_drvdata(pdev, regs);
337 regulator_unregister(regs[id].rdev);
342 static int as3711_regulator_remove(struct platform_device *pdev)
344 struct as3711_regulator *regs = platform_get_drvdata(pdev);
347 for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
348 regulator_unregister(regs[id].rdev);
352 static struct platform_driver as3711_regulator_driver = {
354 .name = "as3711-regulator",
355 .owner = THIS_MODULE,
357 .probe = as3711_regulator_probe,
358 .remove = as3711_regulator_remove,
361 static int __init as3711_regulator_init(void)
363 return platform_driver_register(&as3711_regulator_driver);
365 subsys_initcall(as3711_regulator_init);
367 static void __exit as3711_regulator_exit(void)
369 platform_driver_unregister(&as3711_regulator_driver);
371 module_exit(as3711_regulator_exit);
373 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
374 MODULE_DESCRIPTION("AS3711 regulator driver");
375 MODULE_ALIAS("platform:as3711-regulator");
376 MODULE_LICENSE("GPL v2");