[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / anatop-regulator.c

/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

struct anatop_regulator {
	const char *name;
	u32 control_reg;
	struct regmap *anatop;
	int vol_bit_shift;
	int vol_bit_width;
	int min_bit_val;
	int min_voltage;
	int max_voltage;
	struct regulator_desc rdesc;
	struct regulator_init_data *initdata;
};

static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
					unsigned selector)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_set_voltage_sel_regmap(reg, selector);
}

static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	return regulator_get_voltage_sel_regmap(reg);
}

static struct regulator_ops anatop_rops = {
	.set_voltage_sel = anatop_regmap_set_voltage_sel,
	.get_voltage_sel = anatop_regmap_get_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
};

static int anatop_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct device_node *anatop_np;
	struct regulator_desc *rdesc;
	struct regulator_dev *rdev;
	struct anatop_regulator *sreg;
	struct regulator_init_data *initdata;
	struct regulator_config config = { };
	int ret = 0;

	initdata = of_get_regulator_init_data(dev, np);
	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
	if (!sreg)
		return -ENOMEM;
	sreg->initdata = initdata;
	sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
			     GFP_KERNEL);
	rdesc = &sreg->rdesc;
	memset(rdesc, 0, sizeof(*rdesc));
	rdesc->name = sreg->name;
	rdesc->ops = &anatop_rops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->owner = THIS_MODULE;

	anatop_np = of_get_parent(np);
	if (!anatop_np)
		return -ENODEV;
	sreg->anatop = syscon_node_to_regmap(anatop_np);
	of_node_put(anatop_np);
	if (IS_ERR(sreg->anatop))
		return PTR_ERR(sreg->anatop);

	ret = of_property_read_u32(np, "anatop-reg-offset",
				   &sreg->control_reg);
	if (ret) {
		dev_err(dev, "no anatop-reg-offset property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-width",
				   &sreg->vol_bit_width);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-width property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-shift",
				   &sreg->vol_bit_shift);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-shift property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-min-bit-val",
				   &sreg->min_bit_val);
	if (ret) {
		dev_err(dev, "no anatop-min-bit-val property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-min-voltage",
				   &sreg->min_voltage);
	if (ret) {
		dev_err(dev, "no anatop-min-voltage property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-max-voltage",
				   &sreg->max_voltage);
	if (ret) {
		dev_err(dev, "no anatop-max-voltage property set\n");
		goto anatop_probe_end;
	}

	rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
			    + sreg->min_bit_val;
	rdesc->min_uV = sreg->min_voltage;
	rdesc->uV_step = 25000;
	rdesc->linear_min_sel = sreg->min_bit_val;
	rdesc->vsel_reg = sreg->control_reg;
	rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
			   sreg->vol_bit_shift;

	config.dev = &pdev->dev;
	config.init_data = initdata;
	config.driver_data = sreg;
	config.of_node = pdev->dev.of_node;
	config.regmap = sreg->anatop;

	/* register regulator */
	rdev = regulator_register(rdesc, &config);
	if (IS_ERR(rdev)) {
		dev_err(dev, "failed to register %s\n",
			rdesc->name);
		ret = PTR_ERR(rdev);
		goto anatop_probe_end;
	}

	platform_set_drvdata(pdev, rdev);

anatop_probe_end:
	if (ret)
		kfree(sreg->name);

	return ret;
}

static int anatop_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
	const char *name = sreg->name;

	regulator_unregister(rdev);
	kfree(name);

	return 0;
}

static struct of_device_id of_anatop_regulator_match_tbl[] = {
	{ .compatible = "fsl,anatop-regulator", },
	{ /* end */ }
};

static struct platform_driver anatop_regulator_driver = {
	.driver = {
		.name	= "anatop_regulator",
		.owner  = THIS_MODULE,
		.of_match_table = of_anatop_regulator_match_tbl,
	},
	.probe	= anatop_regulator_probe,
	.remove	= anatop_regulator_remove,
};

static int __init anatop_regulator_init(void)
{
	return platform_driver_register(&anatop_regulator_driver);
}
postcore_initcall(anatop_regulator_init);

static void __exit anatop_regulator_exit(void)
{
	platform_driver_unregister(&anatop_regulator_driver);
}
module_exit(anatop_regulator_exit);

MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
	      "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
MODULE_DESCRIPTION("ANATOP Regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e3e5aff7 YCLP	1	/*
	2	* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
	3	*/
	4
	5	/*
	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.
	10
	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.
	15
	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.
	19	*/
	20
	21	#include <linux/slab.h>
	22	#include <linux/device.h>
	23	#include <linux/module.h>
baa64151	24	#include <linux/mfd/syscon.h>
e3e5aff7 YCLP	25	#include <linux/err.h>
	26	#include <linux/io.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/of.h>
	29	#include <linux/of_address.h>
baa64151	30	#include <linux/regmap.h>
e3e5aff7 YCLP	31	#include <linux/regulator/driver.h>
	32	#include <linux/regulator/of_regulator.h>
	33
	34	struct anatop_regulator {
	35	const char *name;
	36	u32 control_reg;
baa64151	37	struct regmap *anatop;
e3e5aff7 YCLP	38	int vol_bit_shift;
	39	int vol_bit_width;
	40	int min_bit_val;
	41	int min_voltage;
	42	int max_voltage;
	43	struct regulator_desc rdesc;
	44	struct regulator_init_data *initdata;
	45	};
	46
baa64151 DA	47	static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
baa64151 DA	48	unsigned selector)
e3e5aff7 YCLP	49	{
e3e5aff7 YCLP	50	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
e3e5aff7 YCLP	51
	52	if (!anatop_reg->control_reg)
	53	return -ENOTSUPP;
	54
e1b0144f	55	return regulator_set_voltage_sel_regmap(reg, selector);
e3e5aff7 YCLP	56	}
e3e5aff7 YCLP	57
baa64151	58	static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
e3e5aff7 YCLP	59	{
e3e5aff7 YCLP	60	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
e3e5aff7 YCLP	61
	62	if (!anatop_reg->control_reg)
	63	return -ENOTSUPP;
	64
e1b0144f	65	return regulator_get_voltage_sel_regmap(reg);
e3e5aff7 YCLP	66	}
e3e5aff7 YCLP	67
e3e5aff7	68	static struct regulator_ops anatop_rops = {
baa64151 DA	69	.set_voltage_sel = anatop_regmap_set_voltage_sel,
baa64151 DA	70	.get_voltage_sel = anatop_regmap_get_voltage_sel,
d01c3a1e AL	71	.list_voltage = regulator_list_voltage_linear,
d01c3a1e AL	72	.map_voltage = regulator_map_voltage_linear,
e3e5aff7 YCLP	73	};
e3e5aff7 YCLP	74
a5023574	75	static int anatop_regulator_probe(struct platform_device *pdev)
e3e5aff7 YCLP	76	{
	77	struct device *dev = &pdev->dev;
	78	struct device_node *np = dev->of_node;
baa64151	79	struct device_node *anatop_np;
e3e5aff7 YCLP	80	struct regulator_desc *rdesc;
	81	struct regulator_dev *rdev;
	82	struct anatop_regulator *sreg;
	83	struct regulator_init_data *initdata;
d914d81b	84	struct regulator_config config = { };
e3e5aff7 YCLP	85	int ret = 0;
	86
	87	initdata = of_get_regulator_init_data(dev, np);
	88	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
	89	if (!sreg)
	90	return -ENOMEM;
	91	sreg->initdata = initdata;
	92	sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
	93	GFP_KERNEL);
	94	rdesc = &sreg->rdesc;
	95	memset(rdesc, 0, sizeof(*rdesc));
	96	rdesc->name = sreg->name;
	97	rdesc->ops = &anatop_rops;
	98	rdesc->type = REGULATOR_VOLTAGE;
	99	rdesc->owner = THIS_MODULE;
baa64151 DA	100
	101	anatop_np = of_get_parent(np);
	102	if (!anatop_np)
	103	return -ENODEV;
	104	sreg->anatop = syscon_node_to_regmap(anatop_np);
	105	of_node_put(anatop_np);
	106	if (IS_ERR(sreg->anatop))
	107	return PTR_ERR(sreg->anatop);
	108
2f2cc27f YCLP	109	ret = of_property_read_u32(np, "anatop-reg-offset",
2f2cc27f YCLP	110	&sreg->control_reg);
e3e5aff7	111	if (ret) {
2f2cc27f	112	dev_err(dev, "no anatop-reg-offset property set\n");
e3e5aff7 YCLP	113	goto anatop_probe_end;
	114	}
	115	ret = of_property_read_u32(np, "anatop-vol-bit-width",
	116	&sreg->vol_bit_width);
	117	if (ret) {
	118	dev_err(dev, "no anatop-vol-bit-width property set\n");
	119	goto anatop_probe_end;
	120	}
	121	ret = of_property_read_u32(np, "anatop-vol-bit-shift",
	122	&sreg->vol_bit_shift);
	123	if (ret) {
	124	dev_err(dev, "no anatop-vol-bit-shift property set\n");
	125	goto anatop_probe_end;
	126	}
	127	ret = of_property_read_u32(np, "anatop-min-bit-val",
	128	&sreg->min_bit_val);
	129	if (ret) {
	130	dev_err(dev, "no anatop-min-bit-val property set\n");
	131	goto anatop_probe_end;
	132	}
	133	ret = of_property_read_u32(np, "anatop-min-voltage",
	134	&sreg->min_voltage);
	135	if (ret) {
	136	dev_err(dev, "no anatop-min-voltage property set\n");
	137	goto anatop_probe_end;
	138	}
	139	ret = of_property_read_u32(np, "anatop-max-voltage",
	140	&sreg->max_voltage);
	141	if (ret) {
	142	dev_err(dev, "no anatop-max-voltage property set\n");
	143	goto anatop_probe_end;
	144	}
	145
985884db AL	146	rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
985884db AL	147	+ sreg->min_bit_val;
0713e6ab AL	148	rdesc->min_uV = sreg->min_voltage;
0713e6ab AL	149	rdesc->uV_step = 25000;
985884db	150	rdesc->linear_min_sel = sreg->min_bit_val;
e1b0144f AL	151	rdesc->vsel_reg = sreg->control_reg;
	152	rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
	153	sreg->vol_bit_shift;
e3e5aff7	154
d914d81b AL	155	config.dev = &pdev->dev;
	156	config.init_data = initdata;
	157	config.driver_data = sreg;
	158	config.of_node = pdev->dev.of_node;
e1b0144f	159	config.regmap = sreg->anatop;
d914d81b	160
e3e5aff7	161	/* register regulator */
d914d81b	162	rdev = regulator_register(rdesc, &config);
e3e5aff7 YCLP	163	if (IS_ERR(rdev)) {
	164	dev_err(dev, "failed to register %s\n",
	165	rdesc->name);
	166	ret = PTR_ERR(rdev);
	167	goto anatop_probe_end;
	168	}
	169
	170	platform_set_drvdata(pdev, rdev);
	171
	172	anatop_probe_end:
	173	if (ret)
	174	kfree(sreg->name);
	175
	176	return ret;
	177	}
	178
8dc995f5	179	static int anatop_regulator_remove(struct platform_device *pdev)
e3e5aff7 YCLP	180	{
	181	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	182	struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
	183	const char *name = sreg->name;
	184
	185	regulator_unregister(rdev);
	186	kfree(name);
	187
	188	return 0;
	189	}
	190
3d68dfe3	191	static struct of_device_id of_anatop_regulator_match_tbl[] = {
e3e5aff7 YCLP	192	{ .compatible = "fsl,anatop-regulator", },
	193	{ /* end */ }
	194	};
	195
c0d78c23	196	static struct platform_driver anatop_regulator_driver = {
e3e5aff7 YCLP	197	.driver = {
	198	.name = "anatop_regulator",
	199	.owner = THIS_MODULE,
	200	.of_match_table = of_anatop_regulator_match_tbl,
	201	},
	202	.probe = anatop_regulator_probe,
5eb9f2b9	203	.remove = anatop_regulator_remove,
e3e5aff7 YCLP	204	};
	205
	206	static int __init anatop_regulator_init(void)
	207	{
c0d78c23	208	return platform_driver_register(&anatop_regulator_driver);
e3e5aff7 YCLP	209	}
	210	postcore_initcall(anatop_regulator_init);
	211
	212	static void __exit anatop_regulator_exit(void)
	213	{
c0d78c23	214	platform_driver_unregister(&anatop_regulator_driver);
e3e5aff7 YCLP	215	}
	216	module_exit(anatop_regulator_exit);
	217
	218	MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
	219	"Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
	220	MODULE_DESCRIPTION("ANATOP Regulator driver");
	221	MODULE_LICENSE("GPL v2");