2 * wm8994-regulator.c -- Regulator driver for the WM8994
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/gpio.h>
22 #include <linux/slab.h>
24 #include <linux/mfd/wm8994/core.h>
25 #include <linux/mfd/wm8994/registers.h>
26 #include <linux/mfd/wm8994/pdata.h>
31 struct regulator_dev
*regulator
;
32 struct wm8994
*wm8994
;
35 #define WM8994_LDO1_MAX_SELECTOR 0x7
36 #define WM8994_LDO2_MAX_SELECTOR 0x3
38 static int wm8994_ldo_enable(struct regulator_dev
*rdev
)
40 struct wm8994_ldo
*ldo
= rdev_get_drvdata(rdev
);
42 /* If we have no soft control assume that the LDO is always enabled. */
46 gpio_set_value_cansleep(ldo
->enable
, 1);
47 ldo
->is_enabled
= true;
52 static int wm8994_ldo_disable(struct regulator_dev
*rdev
)
54 struct wm8994_ldo
*ldo
= rdev_get_drvdata(rdev
);
56 /* If we have no soft control assume that the LDO is always enabled. */
60 gpio_set_value_cansleep(ldo
->enable
, 0);
61 ldo
->is_enabled
= false;
66 static int wm8994_ldo_is_enabled(struct regulator_dev
*rdev
)
68 struct wm8994_ldo
*ldo
= rdev_get_drvdata(rdev
);
70 return ldo
->is_enabled
;
73 static int wm8994_ldo_enable_time(struct regulator_dev
*rdev
)
75 /* 3ms is fairly conservative but this shouldn't be too performance
76 * critical; can be tweaked per-system if required. */
80 static int wm8994_ldo1_list_voltage(struct regulator_dev
*rdev
,
81 unsigned int selector
)
83 if (selector
> WM8994_LDO1_MAX_SELECTOR
)
86 return (selector
* 100000) + 2400000;
89 static struct regulator_ops wm8994_ldo1_ops
= {
90 .enable
= wm8994_ldo_enable
,
91 .disable
= wm8994_ldo_disable
,
92 .is_enabled
= wm8994_ldo_is_enabled
,
93 .enable_time
= wm8994_ldo_enable_time
,
95 .list_voltage
= wm8994_ldo1_list_voltage
,
96 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
97 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
100 static int wm8994_ldo2_list_voltage(struct regulator_dev
*rdev
,
101 unsigned int selector
)
103 struct wm8994_ldo
*ldo
= rdev_get_drvdata(rdev
);
105 if (selector
> WM8994_LDO2_MAX_SELECTOR
)
108 switch (ldo
->wm8994
->type
) {
110 return (selector
* 100000) + 900000;
112 return (selector
* 100000) + 1000000;
118 return (selector
* 100000) + 950000;
126 static struct regulator_ops wm8994_ldo2_ops
= {
127 .enable
= wm8994_ldo_enable
,
128 .disable
= wm8994_ldo_disable
,
129 .is_enabled
= wm8994_ldo_is_enabled
,
130 .enable_time
= wm8994_ldo_enable_time
,
132 .list_voltage
= wm8994_ldo2_list_voltage
,
133 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
134 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
137 static const struct regulator_desc wm8994_ldo_desc
[] = {
141 .type
= REGULATOR_VOLTAGE
,
142 .n_voltages
= WM8994_LDO1_MAX_SELECTOR
+ 1,
143 .vsel_reg
= WM8994_LDO_1
,
144 .vsel_mask
= WM8994_LDO1_VSEL_MASK
,
145 .ops
= &wm8994_ldo1_ops
,
146 .owner
= THIS_MODULE
,
151 .type
= REGULATOR_VOLTAGE
,
152 .n_voltages
= WM8994_LDO2_MAX_SELECTOR
+ 1,
153 .vsel_reg
= WM8994_LDO_2
,
154 .vsel_mask
= WM8994_LDO2_VSEL_MASK
,
155 .ops
= &wm8994_ldo2_ops
,
156 .owner
= THIS_MODULE
,
160 static __devinit
int wm8994_ldo_probe(struct platform_device
*pdev
)
162 struct wm8994
*wm8994
= dev_get_drvdata(pdev
->dev
.parent
);
163 struct wm8994_pdata
*pdata
= wm8994
->dev
->platform_data
;
164 int id
= pdev
->id
% ARRAY_SIZE(pdata
->ldo
);
165 struct regulator_config config
= { };
166 struct wm8994_ldo
*ldo
;
169 dev_dbg(&pdev
->dev
, "Probing LDO%d\n", id
+ 1);
171 ldo
= devm_kzalloc(&pdev
->dev
, sizeof(struct wm8994_ldo
), GFP_KERNEL
);
173 dev_err(&pdev
->dev
, "Unable to allocate private data\n");
177 ldo
->wm8994
= wm8994
;
179 if (pdata
->ldo
[id
].enable
&& gpio_is_valid(pdata
->ldo
[id
].enable
)) {
180 ldo
->enable
= pdata
->ldo
[id
].enable
;
182 ret
= gpio_request_one(ldo
->enable
, 0, "WM8994 LDO enable");
184 dev_err(&pdev
->dev
, "Failed to get enable GPIO: %d\n",
189 ldo
->is_enabled
= true;
191 config
.dev
= wm8994
->dev
;
192 config
.driver_data
= ldo
;
193 config
.regmap
= wm8994
->regmap
;
195 config
.init_data
= pdata
->ldo
[id
].init_data
;
197 ldo
->regulator
= regulator_register(&wm8994_ldo_desc
[id
], &config
);
198 if (IS_ERR(ldo
->regulator
)) {
199 ret
= PTR_ERR(ldo
->regulator
);
200 dev_err(wm8994
->dev
, "Failed to register LDO%d: %d\n",
205 platform_set_drvdata(pdev
, ldo
);
210 if (gpio_is_valid(ldo
->enable
))
211 gpio_free(ldo
->enable
);
216 static __devexit
int wm8994_ldo_remove(struct platform_device
*pdev
)
218 struct wm8994_ldo
*ldo
= platform_get_drvdata(pdev
);
220 platform_set_drvdata(pdev
, NULL
);
222 regulator_unregister(ldo
->regulator
);
223 if (gpio_is_valid(ldo
->enable
))
224 gpio_free(ldo
->enable
);
229 static struct platform_driver wm8994_ldo_driver
= {
230 .probe
= wm8994_ldo_probe
,
231 .remove
= __devexit_p(wm8994_ldo_remove
),
233 .name
= "wm8994-ldo",
234 .owner
= THIS_MODULE
,
238 static int __init
wm8994_ldo_init(void)
242 ret
= platform_driver_register(&wm8994_ldo_driver
);
244 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret
);
248 subsys_initcall(wm8994_ldo_init
);
250 static void __exit
wm8994_ldo_exit(void)
252 platform_driver_unregister(&wm8994_ldo_driver
);
254 module_exit(wm8994_ldo_exit
);
256 /* Module information */
257 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
258 MODULE_DESCRIPTION("WM8994 LDO driver");
259 MODULE_LICENSE("GPL");
260 MODULE_ALIAS("platform:wm8994-ldo");