[linux.git] / drivers / mfd / tps65911-comparator.c

/*
 * tps65910.c  --  TI TPS6591x
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Jorge Eduardo Candelaria <[email protected]>
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65910.h>

#define COMP					0
#define COMP1					1
#define COMP2					2

/* Comparator 1 voltage selection table in millivolts */
static const u16 COMP_VSEL_TABLE[] = {
	0, 2500, 2500, 2500, 2500, 2550, 2600, 2650,
	2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050,
	3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450,
	3500,
};

struct comparator {
	const char *name;
	int reg;
	int uV_max;
	const u16 *vsel_table;
};

static struct comparator tps_comparators[] = {
	{
		.name = "COMP1",
		.reg = TPS65911_VMBCH,
		.uV_max = 3500,
		.vsel_table = COMP_VSEL_TABLE,
	},
	{
		.name = "COMP2",
		.reg = TPS65911_VMBCH2,
		.uV_max = 3500,
		.vsel_table = COMP_VSEL_TABLE,
	},
};

static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
{
	struct comparator tps_comp = tps_comparators[id];
	int curr_voltage = 0;
	int ret;
	u8 index = 0, val;

	if (id == COMP)
		return 0;

	while (curr_voltage < tps_comp.uV_max) {
		curr_voltage = tps_comp.vsel_table[index];
		if (curr_voltage >= voltage)
			break;
		else if (curr_voltage < voltage)
			index ++;
	}

	if (curr_voltage > tps_comp.uV_max)
		return -EINVAL;

	val = index << 1;
	ret = tps65910->write(tps65910, tps_comp.reg, 1, &val);

	return ret;
}

static int comp_threshold_get(struct tps65910 *tps65910, int id)
{
	struct comparator tps_comp = tps_comparators[id];
	int ret;
	u8 val;

	if (id == COMP)
		return 0;

	ret = tps65910->read(tps65910, tps_comp.reg, 1, &val);
	if (ret < 0)
		return ret;

	val >>= 1;
	return tps_comp.vsel_table[val];
}

static ssize_t comp_threshold_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct tps65910 *tps65910 = dev_get_drvdata(dev->parent);
	struct attribute comp_attr = attr->attr;
	int id, uVolt;

	if (!strcmp(comp_attr.name, "comp1_threshold"))
		id = COMP1;
	else if (!strcmp(comp_attr.name, "comp2_threshold"))
		id = COMP2;
	else
		return -EINVAL;

	uVolt = comp_threshold_get(tps65910, id);

	return sprintf(buf, "%d\n", uVolt);
}

static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL);
static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL);

static int tps65911_comparator_probe(struct platform_device *pdev)
{
	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
	int ret;

	ret = comp_threshold_set(tps65910, COMP1,  pdata->vmbch_threshold);
	if (ret < 0) {
		dev_err(&pdev->dev, "cannot set COMP1 threshold\n");
		return ret;
	}

	ret = comp_threshold_set(tps65910, COMP2, pdata->vmbch2_threshold);
	if (ret < 0) {
		dev_err(&pdev->dev, "cannot set COMP2 threshold\n");
		return ret;
	}

	/* Create sysfs entry */
	ret = device_create_file(&pdev->dev, &dev_attr_comp1_threshold);
	if (ret < 0)
		dev_err(&pdev->dev, "failed to add COMP1 sysfs file\n");

	ret = device_create_file(&pdev->dev, &dev_attr_comp2_threshold);
	if (ret < 0)
		dev_err(&pdev->dev, "failed to add COMP2 sysfs file\n");

	return ret;
}

static int tps65911_comparator_remove(struct platform_device *pdev)
{
	struct tps65910 *tps65910;

	tps65910 = dev_get_drvdata(pdev->dev.parent);
	device_remove_file(&pdev->dev, &dev_attr_comp2_threshold);
	device_remove_file(&pdev->dev, &dev_attr_comp1_threshold);

	return 0;
}

static struct platform_driver tps65911_comparator_driver = {
	.driver = {
		.name = "tps65911-comparator",
	},
	.probe = tps65911_comparator_probe,
	.remove = tps65911_comparator_remove,
};

static int __init tps65911_comparator_init(void)
{
	return platform_driver_register(&tps65911_comparator_driver);
}
subsys_initcall(tps65911_comparator_init);

static void __exit tps65911_comparator_exit(void)
{
	platform_driver_unregister(&tps65911_comparator_driver);
}
module_exit(tps65911_comparator_exit);

MODULE_AUTHOR("Jorge Eduardo Candelaria <[email protected]>");
MODULE_DESCRIPTION("TPS65911 comparator driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65911-comparator");
Commit	Line	Data
6851ad3a JEC	1	/*
	2	* tps65910.c -- TI TPS6591x
	3	*
	4	* Copyright 2010 Texas Instruments Inc.
	5	*
	6	* Author: Jorge Eduardo Candelaria <[email protected]>
	7	*
	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.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <linux/err.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/debugfs.h>
	22	#include <linux/gpio.h>
	23	#include <linux/mfd/tps65910.h>
	24
	25	#define COMP 0
	26	#define COMP1 1
	27	#define COMP2 2
	28
91fe4d50	29	/* Comparator 1 voltage selection table in millivolts */
6851ad3a JEC	30	static const u16 COMP_VSEL_TABLE[] = {
	31	0, 2500, 2500, 2500, 2500, 2550, 2600, 2650,
	32	2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050,
	33	3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450,
	34	3500,
	35	};
	36
	37	struct comparator {
	38	const char *name;
	39	int reg;
	40	int uV_max;
	41	const u16 *vsel_table;
	42	};
	43
	44	static struct comparator tps_comparators[] = {
	45	{
	46	.name = "COMP1",
	47	.reg = TPS65911_VMBCH,
	48	.uV_max = 3500,
	49	.vsel_table = COMP_VSEL_TABLE,
	50	},
	51	{
	52	.name = "COMP2",
	53	.reg = TPS65911_VMBCH2,
	54	.uV_max = 3500,
	55	.vsel_table = COMP_VSEL_TABLE,
	56	},
	57	};
	58
	59	static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
	60	{
	61	struct comparator tps_comp = tps_comparators[id];
	62	int curr_voltage = 0;
	63	int ret;
	64	u8 index = 0, val;
	65
	66	if (id == COMP)
	67	return 0;
	68
	69	while (curr_voltage < tps_comp.uV_max) {
	70	curr_voltage = tps_comp.vsel_table[index];
	71	if (curr_voltage >= voltage)
	72	break;
	73	else if (curr_voltage < voltage)
	74	index ++;
	75	}
	76
	77	if (curr_voltage > tps_comp.uV_max)
	78	return -EINVAL;
	79
	80	val = index << 1;
	81	ret = tps65910->write(tps65910, tps_comp.reg, 1, &val);
	82
	83	return ret;
	84	}
	85
	86	static int comp_threshold_get(struct tps65910 *tps65910, int id)
	87	{
	88	struct comparator tps_comp = tps_comparators[id];
	89	int ret;
	90	u8 val;
	91
	92	if (id == COMP)
	93	return 0;
94
95	ret = tps65910->read(tps65910, tps_comp.reg, 1, &val);
96	if (ret < 0)
97	return ret;
98
99	val >>= 1;
100	return tps_comp.vsel_table[val];
101	}
102
103	static ssize_t comp_threshold_show(struct device *dev,
104	struct device_attribute attr, char buf)
105	{
106	struct tps65910 *tps65910 = dev_get_drvdata(dev->parent);
107	struct attribute comp_attr = attr->attr;
108	int id, uVolt;
109
110	if (!strcmp(comp_attr.name, "comp1_threshold"))
111	id = COMP1;
112	else if (!strcmp(comp_attr.name, "comp2_threshold"))
113	id = COMP2;
114	else
115	return -EINVAL;
116
117	uVolt = comp_threshold_get(tps65910, id);
118
119	return sprintf(buf, "%d\n", uVolt);
120	}
121
122	static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL);
123	static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL);
124
f791be49	125	static int tps65911_comparator_probe(struct platform_device *pdev)
6851ad3a JEC	126	{
6851ad3a JEC	127	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
1e8ece5c	128	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
6851ad3a JEC	129	int ret;
	130
	131	ret = comp_threshold_set(tps65910, COMP1, pdata->vmbch_threshold);
	132	if (ret < 0) {
	133	dev_err(&pdev->dev, "cannot set COMP1 threshold\n");
	134	return ret;
	135	}
	136
	137	ret = comp_threshold_set(tps65910, COMP2, pdata->vmbch2_threshold);
	138	if (ret < 0) {
5a4432b9	139	dev_err(&pdev->dev, "cannot set COMP2 threshold\n");
6851ad3a JEC	140	return ret;
	141	}
	142
	143	/* Create sysfs entry */
	144	ret = device_create_file(&pdev->dev, &dev_attr_comp1_threshold);
	145	if (ret < 0)
	146	dev_err(&pdev->dev, "failed to add COMP1 sysfs file\n");
	147
	148	ret = device_create_file(&pdev->dev, &dev_attr_comp2_threshold);
	149	if (ret < 0)
	150	dev_err(&pdev->dev, "failed to add COMP2 sysfs file\n");
	151
	152	return ret;
	153	}
	154
4740f73f	155	static int tps65911_comparator_remove(struct platform_device *pdev)
6851ad3a JEC	156	{
	157	struct tps65910 *tps65910;
	158
	159	tps65910 = dev_get_drvdata(pdev->dev.parent);
2f223341 AL	160	device_remove_file(&pdev->dev, &dev_attr_comp2_threshold);
2f223341 AL	161	device_remove_file(&pdev->dev, &dev_attr_comp1_threshold);
6851ad3a JEC	162
	163	return 0;
	164	}
	165
	166	static struct platform_driver tps65911_comparator_driver = {
	167	.driver = {
	168	.name = "tps65911-comparator",
6851ad3a JEC	169	},
6851ad3a JEC	170	.probe = tps65911_comparator_probe,
84449216	171	.remove = tps65911_comparator_remove,
6851ad3a JEC	172	};
	173
	174	static int __init tps65911_comparator_init(void)
	175	{
	176	return platform_driver_register(&tps65911_comparator_driver);
	177	}
	178	subsys_initcall(tps65911_comparator_init);
	179
	180	static void __exit tps65911_comparator_exit(void)
	181	{
	182	platform_driver_unregister(&tps65911_comparator_driver);
	183	}
	184	module_exit(tps65911_comparator_exit);
	185
	186	MODULE_AUTHOR("Jorge Eduardo Candelaria <[email protected]>");
	187	MODULE_DESCRIPTION("TPS65911 comparator driver");
	188	MODULE_LICENSE("GPL v2");
	189	MODULE_ALIAS("platform:tps65911-comparator");