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/mfd/syscon.h>
25 #include <linux/err.h>
27 #include <linux/platform_device.h>
29 #include <linux/of_address.h>
30 #include <linux/regmap.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/of_regulator.h>
34 struct anatop_regulator
{
37 struct regmap
*anatop
;
43 struct regulator_desc rdesc
;
44 struct regulator_init_data
*initdata
;
47 static int anatop_regmap_set_voltage_sel(struct regulator_dev
*reg
,
50 struct anatop_regulator
*anatop_reg
= rdev_get_drvdata(reg
);
53 if (!anatop_reg
->control_reg
)
56 val
= anatop_reg
->min_bit_val
+ selector
;
57 dev_dbg(®
->dev
, "%s: calculated val %d\n", __func__
, val
);
58 mask
= ((1 << anatop_reg
->vol_bit_width
) - 1) <<
59 anatop_reg
->vol_bit_shift
;
60 val
<<= anatop_reg
->vol_bit_shift
;
61 regmap_update_bits(anatop_reg
->anatop
, anatop_reg
->control_reg
,
67 static int anatop_regmap_get_voltage_sel(struct regulator_dev
*reg
)
69 struct anatop_regulator
*anatop_reg
= rdev_get_drvdata(reg
);
72 if (!anatop_reg
->control_reg
)
75 regmap_read(anatop_reg
->anatop
, anatop_reg
->control_reg
, &val
);
76 mask
= ((1 << anatop_reg
->vol_bit_width
) - 1) <<
77 anatop_reg
->vol_bit_shift
;
78 val
= (val
& mask
) >> anatop_reg
->vol_bit_shift
;
80 return val
- anatop_reg
->min_bit_val
;
83 static struct regulator_ops anatop_rops
= {
84 .set_voltage_sel
= anatop_regmap_set_voltage_sel
,
85 .get_voltage_sel
= anatop_regmap_get_voltage_sel
,
86 .list_voltage
= regulator_list_voltage_linear
,
87 .map_voltage
= regulator_map_voltage_linear
,
90 static int __devinit
anatop_regulator_probe(struct platform_device
*pdev
)
92 struct device
*dev
= &pdev
->dev
;
93 struct device_node
*np
= dev
->of_node
;
94 struct device_node
*anatop_np
;
95 struct regulator_desc
*rdesc
;
96 struct regulator_dev
*rdev
;
97 struct anatop_regulator
*sreg
;
98 struct regulator_init_data
*initdata
;
99 struct regulator_config config
= { };
102 initdata
= of_get_regulator_init_data(dev
, np
);
103 sreg
= devm_kzalloc(dev
, sizeof(*sreg
), GFP_KERNEL
);
106 sreg
->initdata
= initdata
;
107 sreg
->name
= kstrdup(of_get_property(np
, "regulator-name", NULL
),
109 rdesc
= &sreg
->rdesc
;
110 memset(rdesc
, 0, sizeof(*rdesc
));
111 rdesc
->name
= sreg
->name
;
112 rdesc
->ops
= &anatop_rops
;
113 rdesc
->type
= REGULATOR_VOLTAGE
;
114 rdesc
->owner
= THIS_MODULE
;
116 anatop_np
= of_get_parent(np
);
119 sreg
->anatop
= syscon_node_to_regmap(anatop_np
);
120 of_node_put(anatop_np
);
121 if (IS_ERR(sreg
->anatop
))
122 return PTR_ERR(sreg
->anatop
);
124 ret
= of_property_read_u32(np
, "anatop-reg-offset",
127 dev_err(dev
, "no anatop-reg-offset property set\n");
128 goto anatop_probe_end
;
130 ret
= of_property_read_u32(np
, "anatop-vol-bit-width",
131 &sreg
->vol_bit_width
);
133 dev_err(dev
, "no anatop-vol-bit-width property set\n");
134 goto anatop_probe_end
;
136 ret
= of_property_read_u32(np
, "anatop-vol-bit-shift",
137 &sreg
->vol_bit_shift
);
139 dev_err(dev
, "no anatop-vol-bit-shift property set\n");
140 goto anatop_probe_end
;
142 ret
= of_property_read_u32(np
, "anatop-min-bit-val",
145 dev_err(dev
, "no anatop-min-bit-val property set\n");
146 goto anatop_probe_end
;
148 ret
= of_property_read_u32(np
, "anatop-min-voltage",
151 dev_err(dev
, "no anatop-min-voltage property set\n");
152 goto anatop_probe_end
;
154 ret
= of_property_read_u32(np
, "anatop-max-voltage",
157 dev_err(dev
, "no anatop-max-voltage property set\n");
158 goto anatop_probe_end
;
161 rdesc
->n_voltages
= (sreg
->max_voltage
- sreg
->min_voltage
)
163 rdesc
->min_uV
= sreg
->min_voltage
;
164 rdesc
->uV_step
= 25000;
166 config
.dev
= &pdev
->dev
;
167 config
.init_data
= initdata
;
168 config
.driver_data
= sreg
;
169 config
.of_node
= pdev
->dev
.of_node
;
171 /* register regulator */
172 rdev
= regulator_register(rdesc
, &config
);
174 dev_err(dev
, "failed to register %s\n",
177 goto anatop_probe_end
;
180 platform_set_drvdata(pdev
, rdev
);
189 static int __devexit
anatop_regulator_remove(struct platform_device
*pdev
)
191 struct regulator_dev
*rdev
= platform_get_drvdata(pdev
);
192 struct anatop_regulator
*sreg
= rdev_get_drvdata(rdev
);
193 const char *name
= sreg
->name
;
195 regulator_unregister(rdev
);
201 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl
[] = {
202 { .compatible
= "fsl,anatop-regulator", },
206 static struct platform_driver anatop_regulator_driver
= {
208 .name
= "anatop_regulator",
209 .owner
= THIS_MODULE
,
210 .of_match_table
= of_anatop_regulator_match_tbl
,
212 .probe
= anatop_regulator_probe
,
213 .remove
= __devexit_p(anatop_regulator_remove
),
216 static int __init
anatop_regulator_init(void)
218 return platform_driver_register(&anatop_regulator_driver
);
220 postcore_initcall(anatop_regulator_init
);
222 static void __exit
anatop_regulator_exit(void)
224 platform_driver_unregister(&anatop_regulator_driver
);
226 module_exit(anatop_regulator_exit
);
228 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
229 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
230 MODULE_DESCRIPTION("ANATOP Regulator driver");
231 MODULE_LICENSE("GPL v2");