2 * max77686.c - Regulator driver for the Maxim 77686
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@smasung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This driver is based on max8997.c
25 #include <linux/kernel.h>
26 #include <linux/bug.h>
27 #include <linux/delay.h>
28 #include <linux/err.h>
29 #include <linux/gpio.h>
30 #include <linux/slab.h>
31 #include <linux/platform_device.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/regulator/of_regulator.h>
35 #include <linux/mfd/max77686.h>
36 #include <linux/mfd/max77686-private.h>
38 #define MAX77686_LDO_MINUV 800000
39 #define MAX77686_LDO_UVSTEP 50000
40 #define MAX77686_LDO_LOW_MINUV 800000
41 #define MAX77686_LDO_LOW_UVSTEP 25000
42 #define MAX77686_BUCK_MINUV 750000
43 #define MAX77686_BUCK_UVSTEP 50000
44 #define MAX77686_RAMP_DELAY 100000 /* uV/us */
45 #define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
46 #define MAX77686_DVS_MINUV 600000
47 #define MAX77686_DVS_UVSTEP 12500
49 #define MAX77686_OPMODE_SHIFT 6
50 #define MAX77686_OPMODE_BUCK234_SHIFT 4
51 #define MAX77686_OPMODE_MASK 0x3
53 #define MAX77686_VSEL_MASK 0x3F
54 #define MAX77686_DVS_VSEL_MASK 0xFF
56 #define MAX77686_RAMP_RATE_MASK 0xC0
58 #define MAX77686_REGULATORS MAX77686_REG_MAX
59 #define MAX77686_LDOS 26
61 enum max77686_ramp_rate
{
65 RAMP_RATE_NO_CTRL
, /* 100mV/us */
68 struct max77686_data
{
69 struct regulator_dev
**rdev
;
72 static int max77686_set_ramp_delay(struct regulator_dev
*rdev
, int ramp_delay
)
74 unsigned int ramp_value
= RAMP_RATE_NO_CTRL
;
78 ramp_value
= RAMP_RATE_13P75MV
;
81 ramp_value
= RAMP_RATE_27P5MV
;
84 ramp_value
= RAMP_RATE_55MV
;
86 case 55001 ... 100000:
89 pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
90 rdev
->desc
->name
, ramp_delay
);
93 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
94 MAX77686_RAMP_RATE_MASK
, ramp_value
<< 6);
97 static struct regulator_ops max77686_ops
= {
98 .list_voltage
= regulator_list_voltage_linear
,
99 .map_voltage
= regulator_map_voltage_linear
,
100 .is_enabled
= regulator_is_enabled_regmap
,
101 .enable
= regulator_enable_regmap
,
102 .disable
= regulator_disable_regmap
,
103 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
104 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
105 .set_voltage_time_sel
= regulator_set_voltage_time_sel
,
108 static struct regulator_ops max77686_buck_dvs_ops
= {
109 .list_voltage
= regulator_list_voltage_linear
,
110 .map_voltage
= regulator_map_voltage_linear
,
111 .is_enabled
= regulator_is_enabled_regmap
,
112 .enable
= regulator_enable_regmap
,
113 .disable
= regulator_disable_regmap
,
114 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
115 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
116 .set_voltage_time_sel
= regulator_set_voltage_time_sel
,
117 .set_ramp_delay
= max77686_set_ramp_delay
,
120 #define regulator_desc_ldo(num) { \
122 .id = MAX77686_LDO##num, \
123 .ops = &max77686_ops, \
124 .type = REGULATOR_VOLTAGE, \
125 .owner = THIS_MODULE, \
126 .min_uV = MAX77686_LDO_MINUV, \
127 .uV_step = MAX77686_LDO_UVSTEP, \
128 .ramp_delay = MAX77686_RAMP_DELAY, \
129 .n_voltages = MAX77686_VSEL_MASK + 1, \
130 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
131 .vsel_mask = MAX77686_VSEL_MASK, \
132 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
133 .enable_mask = MAX77686_OPMODE_MASK \
134 << MAX77686_OPMODE_SHIFT, \
136 #define regulator_desc_ldo_low(num) { \
138 .id = MAX77686_LDO##num, \
139 .ops = &max77686_ops, \
140 .type = REGULATOR_VOLTAGE, \
141 .owner = THIS_MODULE, \
142 .min_uV = MAX77686_LDO_LOW_MINUV, \
143 .uV_step = MAX77686_LDO_LOW_UVSTEP, \
144 .ramp_delay = MAX77686_RAMP_DELAY, \
145 .n_voltages = MAX77686_VSEL_MASK + 1, \
146 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
147 .vsel_mask = MAX77686_VSEL_MASK, \
148 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
149 .enable_mask = MAX77686_OPMODE_MASK \
150 << MAX77686_OPMODE_SHIFT, \
152 #define regulator_desc_buck(num) { \
153 .name = "BUCK"#num, \
154 .id = MAX77686_BUCK##num, \
155 .ops = &max77686_ops, \
156 .type = REGULATOR_VOLTAGE, \
157 .owner = THIS_MODULE, \
158 .min_uV = MAX77686_BUCK_MINUV, \
159 .uV_step = MAX77686_BUCK_UVSTEP, \
160 .ramp_delay = MAX77686_RAMP_DELAY, \
161 .n_voltages = MAX77686_VSEL_MASK + 1, \
162 .vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
163 .vsel_mask = MAX77686_VSEL_MASK, \
164 .enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
165 .enable_mask = MAX77686_OPMODE_MASK, \
167 #define regulator_desc_buck1(num) { \
168 .name = "BUCK"#num, \
169 .id = MAX77686_BUCK##num, \
170 .ops = &max77686_ops, \
171 .type = REGULATOR_VOLTAGE, \
172 .owner = THIS_MODULE, \
173 .min_uV = MAX77686_BUCK_MINUV, \
174 .uV_step = MAX77686_BUCK_UVSTEP, \
175 .ramp_delay = MAX77686_RAMP_DELAY, \
176 .n_voltages = MAX77686_VSEL_MASK + 1, \
177 .vsel_reg = MAX77686_REG_BUCK1OUT, \
178 .vsel_mask = MAX77686_VSEL_MASK, \
179 .enable_reg = MAX77686_REG_BUCK1CTRL, \
180 .enable_mask = MAX77686_OPMODE_MASK, \
182 #define regulator_desc_buck_dvs(num) { \
183 .name = "BUCK"#num, \
184 .id = MAX77686_BUCK##num, \
185 .ops = &max77686_buck_dvs_ops, \
186 .type = REGULATOR_VOLTAGE, \
187 .owner = THIS_MODULE, \
188 .min_uV = MAX77686_DVS_MINUV, \
189 .uV_step = MAX77686_DVS_UVSTEP, \
190 .ramp_delay = MAX77686_DVS_RAMP_DELAY, \
191 .n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
192 .vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
193 .vsel_mask = MAX77686_DVS_VSEL_MASK, \
194 .enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
195 .enable_mask = MAX77686_OPMODE_MASK \
196 << MAX77686_OPMODE_BUCK234_SHIFT, \
199 static struct regulator_desc regulators
[] = {
200 regulator_desc_ldo_low(1),
201 regulator_desc_ldo_low(2),
202 regulator_desc_ldo(3),
203 regulator_desc_ldo(4),
204 regulator_desc_ldo(5),
205 regulator_desc_ldo_low(6),
206 regulator_desc_ldo_low(7),
207 regulator_desc_ldo_low(8),
208 regulator_desc_ldo(9),
209 regulator_desc_ldo(10),
210 regulator_desc_ldo(11),
211 regulator_desc_ldo(12),
212 regulator_desc_ldo(13),
213 regulator_desc_ldo(14),
214 regulator_desc_ldo_low(15),
215 regulator_desc_ldo(16),
216 regulator_desc_ldo(17),
217 regulator_desc_ldo(18),
218 regulator_desc_ldo(19),
219 regulator_desc_ldo(20),
220 regulator_desc_ldo(21),
221 regulator_desc_ldo(22),
222 regulator_desc_ldo(23),
223 regulator_desc_ldo(24),
224 regulator_desc_ldo(25),
225 regulator_desc_ldo(26),
226 regulator_desc_buck1(1),
227 regulator_desc_buck_dvs(2),
228 regulator_desc_buck_dvs(3),
229 regulator_desc_buck_dvs(4),
230 regulator_desc_buck(5),
231 regulator_desc_buck(6),
232 regulator_desc_buck(7),
233 regulator_desc_buck(8),
234 regulator_desc_buck(9),
238 static int max77686_pmic_dt_parse_pdata(struct max77686_dev
*iodev
,
239 struct max77686_platform_data
*pdata
)
241 struct device_node
*pmic_np
, *regulators_np
;
242 struct max77686_regulator_data
*rdata
;
243 struct of_regulator_match rmatch
;
246 pmic_np
= iodev
->dev
->of_node
;
247 regulators_np
= of_find_node_by_name(pmic_np
, "voltage-regulators");
248 if (!regulators_np
) {
249 dev_err(iodev
->dev
, "could not find regulators sub-node\n");
253 pdata
->num_regulators
= ARRAY_SIZE(regulators
);
254 rdata
= devm_kzalloc(iodev
->dev
, sizeof(*rdata
) *
255 pdata
->num_regulators
, GFP_KERNEL
);
258 "could not allocate memory for regulator data\n");
262 for (i
= 0; i
< pdata
->num_regulators
; i
++) {
263 rmatch
.name
= regulators
[i
].name
;
264 rmatch
.init_data
= NULL
;
265 rmatch
.of_node
= NULL
;
266 of_regulator_match(iodev
->dev
, regulators_np
, &rmatch
, 1);
267 rdata
[i
].initdata
= rmatch
.init_data
;
270 pdata
->regulators
= rdata
;
275 static int max77686_pmic_dt_parse_pdata(struct max77686_dev
*iodev
,
276 struct max77686_platform_data
*pdata
)
280 #endif /* CONFIG_OF */
282 static __devinit
int max77686_pmic_probe(struct platform_device
*pdev
)
284 struct max77686_dev
*iodev
= dev_get_drvdata(pdev
->dev
.parent
);
285 struct max77686_platform_data
*pdata
= dev_get_platdata(iodev
->dev
);
286 struct regulator_dev
**rdev
;
287 struct max77686_data
*max77686
;
290 struct regulator_config config
= { };
292 dev_dbg(&pdev
->dev
, "%s\n", __func__
);
295 dev_err(&pdev
->dev
, "no platform data found for regulator\n");
299 if (iodev
->dev
->of_node
) {
300 ret
= max77686_pmic_dt_parse_pdata(iodev
, pdata
);
305 if (pdata
->num_regulators
!= MAX77686_REGULATORS
) {
307 "Invalid initial data for regulator's initialiation\n");
311 max77686
= devm_kzalloc(&pdev
->dev
, sizeof(struct max77686_data
),
316 size
= sizeof(struct regulator_dev
*) * MAX77686_REGULATORS
;
317 max77686
->rdev
= devm_kzalloc(&pdev
->dev
, size
, GFP_KERNEL
);
321 rdev
= max77686
->rdev
;
322 config
.dev
= &pdev
->dev
;
323 config
.regmap
= iodev
->regmap
;
324 platform_set_drvdata(pdev
, max77686
);
326 for (i
= 0; i
< MAX77686_REGULATORS
; i
++) {
327 config
.init_data
= pdata
->regulators
[i
].initdata
;
329 rdev
[i
] = regulator_register(®ulators
[i
], &config
);
330 if (IS_ERR(rdev
[i
])) {
331 ret
= PTR_ERR(rdev
[i
]);
333 "regulator init failed for %d\n", i
);
342 regulator_unregister(rdev
[i
]);
346 static int __devexit
max77686_pmic_remove(struct platform_device
*pdev
)
348 struct max77686_data
*max77686
= platform_get_drvdata(pdev
);
349 struct regulator_dev
**rdev
= max77686
->rdev
;
352 for (i
= 0; i
< MAX77686_REGULATORS
; i
++)
354 regulator_unregister(rdev
[i
]);
359 static const struct platform_device_id max77686_pmic_id
[] = {
360 {"max77686-pmic", 0},
363 MODULE_DEVICE_TABLE(platform
, max77686_pmic_id
);
365 static struct platform_driver max77686_pmic_driver
= {
367 .name
= "max77686-pmic",
368 .owner
= THIS_MODULE
,
370 .probe
= max77686_pmic_probe
,
371 .remove
= __devexit_p(max77686_pmic_remove
),
372 .id_table
= max77686_pmic_id
,
375 static int __init
max77686_pmic_init(void)
377 return platform_driver_register(&max77686_pmic_driver
);
379 subsys_initcall(max77686_pmic_init
);
381 static void __exit
max77686_pmic_cleanup(void)
383 platform_driver_unregister(&max77686_pmic_driver
);
385 module_exit(max77686_pmic_cleanup
);
387 MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
388 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
389 MODULE_LICENSE("GPL");