[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / wm831x_backup.c

/*
 * Backup battery driver for Wolfson Microelectronics wm831x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/auxadc.h>
#include <linux/mfd/wm831x/pmu.h>
#include <linux/mfd/wm831x/pdata.h>

struct wm831x_backup {
	struct wm831x *wm831x;
	struct power_supply backup;
};

static int wm831x_backup_read_voltage(struct wm831x *wm831x,
				     enum wm831x_auxadc src,
				     union power_supply_propval *val)
{
	int ret;

	ret = wm831x_auxadc_read_uv(wm831x, src);
	if (ret >= 0)
		val->intval = ret;

	return ret;
}

/*********************************************************************
 *		Backup supply properties
 *********************************************************************/

static void wm831x_config_backup(struct wm831x *wm831x)
{
	struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
	struct wm831x_backup_pdata *pdata;
	int ret, reg;

	if (!wm831x_pdata || !wm831x_pdata->backup) {
		dev_warn(wm831x->dev,
			 "No backup battery charger configuration\n");
		return;
	}

	pdata = wm831x_pdata->backup;

	reg = 0;

	if (pdata->charger_enable)
		reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
	if (pdata->no_constant_voltage)
		reg |= WM831X_BKUP_CHG_MODE;

	switch (pdata->vlim) {
	case 2500:
		break;
	case 3100:
		reg |= WM831X_BKUP_CHG_VLIM;
		break;
	default:
		dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
			pdata->vlim);
	}

	switch (pdata->ilim) {
	case 100:
		break;
	case 200:
		reg |= 1;
		break;
	case 300:
		reg |= 2;
		break;
	case 400:
		reg |= 3;
		break;
	default:
		dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
			pdata->ilim);
	}

	ret = wm831x_reg_unlock(wm831x);
	if (ret != 0) {
		dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
		return;
	}

	ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
			      WM831X_BKUP_CHG_ENA_MASK |
			      WM831X_BKUP_CHG_MODE_MASK |
			      WM831X_BKUP_BATT_DET_ENA_MASK |
			      WM831X_BKUP_CHG_VLIM_MASK |
			      WM831X_BKUP_CHG_ILIM_MASK,
			      reg);
	if (ret != 0)
		dev_err(wm831x->dev,
			"Failed to set backup charger config: %d\n", ret);

	wm831x_reg_lock(wm831x);
}

static int wm831x_backup_get_prop(struct power_supply *psy,
				  enum power_supply_property psp,
				  union power_supply_propval *val)
{
	struct wm831x_backup *devdata = dev_get_drvdata(psy->dev->parent);
	struct wm831x *wm831x = devdata->wm831x;
	int ret = 0;

	ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
	if (ret < 0)
		return ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (ret & WM831X_BKUP_CHG_STS)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
						val);
		break;

	case POWER_SUPPLY_PROP_PRESENT:
		if (ret & WM831X_BKUP_CHG_STS)
			val->intval = 1;
		else
			val->intval = 0;
		break;

	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property wm831x_backup_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_PRESENT,
};

/*********************************************************************
 *		Initialisation
 *********************************************************************/

static __devinit int wm831x_backup_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_backup *devdata;
	struct power_supply *backup;
	int ret, irq, i;

	devdata = kzalloc(sizeof(struct wm831x_backup), GFP_KERNEL);
	if (devdata == NULL)
		return -ENOMEM;

	devdata->wm831x = wm831x;
	platform_set_drvdata(pdev, devdata);

	backup = &devdata->backup;

	/* We ignore configuration failures since we can still read
	 * back the status without enabling the charger (which may
	 * already be enabled anyway).
	 */
	wm831x_config_backup(wm831x);

	backup->name = "wm831x-backup";
	backup->type = POWER_SUPPLY_TYPE_BATTERY;
	backup->properties = wm831x_backup_props;
	backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
	backup->get_property = wm831x_backup_get_prop;
	ret = power_supply_register(&pdev->dev, backup);
	if (ret)
		goto err_kmalloc;

	return ret;

err_kmalloc:
	kfree(devdata);
	return ret;
}

static __devexit int wm831x_backup_remove(struct platform_device *pdev)
{
	struct wm831x_backup *devdata = platform_get_drvdata(pdev);

	power_supply_unregister(&devdata->backup);
	kfree(devdata);

	return 0;
}

static struct platform_driver wm831x_backup_driver = {
	.probe = wm831x_backup_probe,
	.remove = __devexit_p(wm831x_backup_remove),
	.driver = {
		.name = "wm831x-backup",
	},
};

static int __init wm831x_backup_init(void)
{
	return platform_driver_register(&wm831x_backup_driver);
}
module_init(wm831x_backup_init);

static void __exit wm831x_backup_exit(void)
{
	platform_driver_unregister(&wm831x_backup_driver);
}
module_exit(wm831x_backup_exit);

MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-backup");
Commit	Line	Data
c26964ea MB	1	/*
	2	* Backup battery driver for Wolfson Microelectronics wm831x PMICs
	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	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 version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/err.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/power_supply.h>
	15
	16	#include <linux/mfd/wm831x/core.h>
	17	#include <linux/mfd/wm831x/auxadc.h>
	18	#include <linux/mfd/wm831x/pmu.h>
	19	#include <linux/mfd/wm831x/pdata.h>
	20
	21	struct wm831x_backup {
	22	struct wm831x *wm831x;
	23	struct power_supply backup;
	24	};
	25
	26	static int wm831x_backup_read_voltage(struct wm831x *wm831x,
	27	enum wm831x_auxadc src,
	28	union power_supply_propval *val)
	29	{
	30	int ret;
	31
	32	ret = wm831x_auxadc_read_uv(wm831x, src);
	33	if (ret >= 0)
	34	val->intval = ret;
	35
	36	return ret;
	37	}
	38
	39	/*********************************************************************
	40	* Backup supply properties
	41	*********************************************************************/
	42
	43	static void wm831x_config_backup(struct wm831x *wm831x)
	44	{
	45	struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
	46	struct wm831x_backup_pdata *pdata;
	47	int ret, reg;
	48
	49	if (!wm831x_pdata \|\| !wm831x_pdata->backup) {
	50	dev_warn(wm831x->dev,
	51	"No backup battery charger configuration\n");
	52	return;
	53	}
	54
	55	pdata = wm831x_pdata->backup;
	56
	57	reg = 0;
	58
	59	if (pdata->charger_enable)
	60	reg \|= WM831X_BKUP_CHG_ENA \| WM831X_BKUP_BATT_DET_ENA;
	61	if (pdata->no_constant_voltage)
	62	reg \|= WM831X_BKUP_CHG_MODE;
	63
	64	switch (pdata->vlim) {
65	case 2500:
66	break;
67	case 3100:
68	reg \|= WM831X_BKUP_CHG_VLIM;
69	break;
70	default:
71	dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
72	pdata->vlim);
73	}
74
75	switch (pdata->ilim) {
76	case 100:
77	break;
78	case 200:
79	reg \|= 1;
80	break;
81	case 300:
82	reg \|= 2;
83	break;
84	case 400:
85	reg \|= 3;
86	break;
87	default:
88	dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
89	pdata->ilim);
90	}
91
92	ret = wm831x_reg_unlock(wm831x);
93	if (ret != 0) {
94	dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
95	return;
96	}
97
98	ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
99	WM831X_BKUP_CHG_ENA_MASK \|
100	WM831X_BKUP_CHG_MODE_MASK \|
101	WM831X_BKUP_BATT_DET_ENA_MASK \|
102	WM831X_BKUP_CHG_VLIM_MASK \|
103	WM831X_BKUP_CHG_ILIM_MASK,
104	reg);
105	if (ret != 0)
106	dev_err(wm831x->dev,
107	"Failed to set backup charger config: %d\n", ret);
108
109	wm831x_reg_lock(wm831x);
110	}
111
112	static int wm831x_backup_get_prop(struct power_supply *psy,
113	enum power_supply_property psp,
114	union power_supply_propval *val)
115	{
116	struct wm831x_backup *devdata = dev_get_drvdata(psy->dev->parent);
117	struct wm831x *wm831x = devdata->wm831x;
118	int ret = 0;
119
120	ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
121	if (ret < 0)
122	return ret;
123
124	switch (psp) {
125	case POWER_SUPPLY_PROP_STATUS:
126	if (ret & WM831X_BKUP_CHG_STS)
127	val->intval = POWER_SUPPLY_STATUS_CHARGING;
128	else
129	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
130	break;
131
132	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
133	ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
134	val);
135	break;
136
137	case POWER_SUPPLY_PROP_PRESENT:
138	if (ret & WM831X_BKUP_CHG_STS)
139	val->intval = 1;
140	else
141	val->intval = 0;
142	break;
143
144	default:
145	ret = -EINVAL;
146	break;
147	}
148
149	return ret;
150	}
151
152	static enum power_supply_property wm831x_backup_props[] = {
153	POWER_SUPPLY_PROP_STATUS,
154	POWER_SUPPLY_PROP_VOLTAGE_NOW,
155	POWER_SUPPLY_PROP_PRESENT,
156	};
157
158	/*********************************************************************
159	* Initialisation
160	*********************************************************************/
161
162	static __devinit int wm831x_backup_probe(struct platform_device *pdev)
163	{
164	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
165	struct wm831x_backup *devdata;
166	struct power_supply *backup;
167	int ret, irq, i;
168
169	devdata = kzalloc(sizeof(struct wm831x_backup), GFP_KERNEL);
170	if (devdata == NULL)
171	return -ENOMEM;
172
173	devdata->wm831x = wm831x;
174	platform_set_drvdata(pdev, devdata);
175
176	backup = &devdata->backup;
177
178	/* We ignore configuration failures since we can still read
179	* back the status without enabling the charger (which may
180	* already be enabled anyway).
181	*/
182	wm831x_config_backup(wm831x);
183
184	backup->name = "wm831x-backup";
185	backup->type = POWER_SUPPLY_TYPE_BATTERY;
186	backup->properties = wm831x_backup_props;
187	backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
188	backup->get_property = wm831x_backup_get_prop;
189	ret = power_supply_register(&pdev->dev, backup);
190	if (ret)
191	goto err_kmalloc;
192
193	return ret;
194
195	err_kmalloc:
196	kfree(devdata);
197	return ret;
198	}
199
200	static __devexit int wm831x_backup_remove(struct platform_device *pdev)
201	{
202	struct wm831x_backup *devdata = platform_get_drvdata(pdev);
203
204	power_supply_unregister(&devdata->backup);
205	kfree(devdata);
206
207	return 0;
208	}
209
210	static struct platform_driver wm831x_backup_driver = {
211	.probe = wm831x_backup_probe,
212	.remove = __devexit_p(wm831x_backup_remove),
213	.driver = {
214	.name = "wm831x-backup",
215	},
216	};
217
218	static int __init wm831x_backup_init(void)
219	{
220	return platform_driver_register(&wm831x_backup_driver);
221	}
222	module_init(wm831x_backup_init);
223
224	static void __exit wm831x_backup_exit(void)
225	{
226	platform_driver_unregister(&wm831x_backup_driver);
227	}
228	module_exit(wm831x_backup_exit);
229
230	MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
231	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
232	MODULE_LICENSE("GPL");
233	MODULE_ALIAS("platform:wm831x-backup");