2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <linux/slab.h>
22 #include <linux/device.h>
23 #include <linux/module.h>
24 #include <linux/err.h>
26 #include <linux/platform_device.h>
28 #include <linux/of_address.h>
29 #include <linux/mfd/anatop.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/of_regulator.h>
33 struct anatop_regulator
{
42 struct regulator_desc rdesc
;
43 struct regulator_init_data
*initdata
;
46 static int anatop_set_voltage_sel(struct regulator_dev
*reg
, unsigned selector
)
48 struct anatop_regulator
*anatop_reg
= rdev_get_drvdata(reg
);
51 if (!anatop_reg
->control_reg
)
54 val
= anatop_reg
->min_bit_val
+ selector
;
55 dev_dbg(®
->dev
, "%s: calculated val %d\n", __func__
, val
);
56 mask
= ((1 << anatop_reg
->vol_bit_width
) - 1) <<
57 anatop_reg
->vol_bit_shift
;
58 val
<<= anatop_reg
->vol_bit_shift
;
59 anatop_write_reg(anatop_reg
->mfd
, anatop_reg
->control_reg
, val
, mask
);
64 static int anatop_get_voltage_sel(struct regulator_dev
*reg
)
66 struct anatop_regulator
*anatop_reg
= rdev_get_drvdata(reg
);
69 if (!anatop_reg
->control_reg
)
72 val
= anatop_read_reg(anatop_reg
->mfd
, anatop_reg
->control_reg
);
73 val
= (val
& ((1 << anatop_reg
->vol_bit_width
) - 1)) >>
74 anatop_reg
->vol_bit_shift
;
76 return val
- anatop_reg
->min_bit_val
;
79 static struct regulator_ops anatop_rops
= {
80 .set_voltage_sel
= anatop_set_voltage_sel
,
81 .get_voltage_sel
= anatop_get_voltage_sel
,
82 .list_voltage
= regulator_list_voltage_linear
,
83 .map_voltage
= regulator_map_voltage_linear
,
86 static int __devinit
anatop_regulator_probe(struct platform_device
*pdev
)
88 struct device
*dev
= &pdev
->dev
;
89 struct device_node
*np
= dev
->of_node
;
90 struct regulator_desc
*rdesc
;
91 struct regulator_dev
*rdev
;
92 struct anatop_regulator
*sreg
;
93 struct regulator_init_data
*initdata
;
94 struct anatop
*anatopmfd
= dev_get_drvdata(pdev
->dev
.parent
);
95 struct regulator_config config
= { };
98 initdata
= of_get_regulator_init_data(dev
, np
);
99 sreg
= devm_kzalloc(dev
, sizeof(*sreg
), GFP_KERNEL
);
102 sreg
->initdata
= initdata
;
103 sreg
->name
= kstrdup(of_get_property(np
, "regulator-name", NULL
),
105 rdesc
= &sreg
->rdesc
;
106 memset(rdesc
, 0, sizeof(*rdesc
));
107 rdesc
->name
= sreg
->name
;
108 rdesc
->ops
= &anatop_rops
;
109 rdesc
->type
= REGULATOR_VOLTAGE
;
110 rdesc
->owner
= THIS_MODULE
;
111 sreg
->mfd
= anatopmfd
;
112 ret
= of_property_read_u32(np
, "anatop-reg-offset",
115 dev_err(dev
, "no anatop-reg-offset property set\n");
116 goto anatop_probe_end
;
118 ret
= of_property_read_u32(np
, "anatop-vol-bit-width",
119 &sreg
->vol_bit_width
);
121 dev_err(dev
, "no anatop-vol-bit-width property set\n");
122 goto anatop_probe_end
;
124 ret
= of_property_read_u32(np
, "anatop-vol-bit-shift",
125 &sreg
->vol_bit_shift
);
127 dev_err(dev
, "no anatop-vol-bit-shift property set\n");
128 goto anatop_probe_end
;
130 ret
= of_property_read_u32(np
, "anatop-min-bit-val",
133 dev_err(dev
, "no anatop-min-bit-val property set\n");
134 goto anatop_probe_end
;
136 ret
= of_property_read_u32(np
, "anatop-min-voltage",
139 dev_err(dev
, "no anatop-min-voltage property set\n");
140 goto anatop_probe_end
;
142 ret
= of_property_read_u32(np
, "anatop-max-voltage",
145 dev_err(dev
, "no anatop-max-voltage property set\n");
146 goto anatop_probe_end
;
149 rdesc
->n_voltages
= (sreg
->max_voltage
- sreg
->min_voltage
)
151 rdesc
->min_uV
= sreg
->min_voltage
;
152 rdesc
->uV_step
= 25000;
154 config
.dev
= &pdev
->dev
;
155 config
.init_data
= initdata
;
156 config
.driver_data
= sreg
;
157 config
.of_node
= pdev
->dev
.of_node
;
159 /* register regulator */
160 rdev
= regulator_register(rdesc
, &config
);
162 dev_err(dev
, "failed to register %s\n",
165 goto anatop_probe_end
;
168 platform_set_drvdata(pdev
, rdev
);
177 static int __devexit
anatop_regulator_remove(struct platform_device
*pdev
)
179 struct regulator_dev
*rdev
= platform_get_drvdata(pdev
);
180 struct anatop_regulator
*sreg
= rdev_get_drvdata(rdev
);
181 const char *name
= sreg
->name
;
183 regulator_unregister(rdev
);
189 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl
[] = {
190 { .compatible
= "fsl,anatop-regulator", },
194 static struct platform_driver anatop_regulator_driver
= {
196 .name
= "anatop_regulator",
197 .owner
= THIS_MODULE
,
198 .of_match_table
= of_anatop_regulator_match_tbl
,
200 .probe
= anatop_regulator_probe
,
201 .remove
= __devexit_p(anatop_regulator_remove
),
204 static int __init
anatop_regulator_init(void)
206 return platform_driver_register(&anatop_regulator_driver
);
208 postcore_initcall(anatop_regulator_init
);
210 static void __exit
anatop_regulator_exit(void)
212 platform_driver_unregister(&anatop_regulator_driver
);
214 module_exit(anatop_regulator_exit
);
216 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
217 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
218 MODULE_DESCRIPTION("ANATOP Regulator driver");
219 MODULE_LICENSE("GPL v2");