1/*
  2 * Regulator driver for RICOH RC5T583 power management chip.
  3 *
  4 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
  5 * Author: Laxman dewangan <ldewangan@nvidia.com>
  6 *
  7 * based on code
  8 *      Copyright (C) 2011 RICOH COMPANY,LTD
  9 *
 10 *
 11 * This program is free software; you can redistribute it and/or modify it
 12 * under the terms and conditions of the GNU General Public License,
 13 * version 2, as published by the Free Software Foundation.
 14 *
 15 * This program is distributed in the hope it will be useful, but WITHOUT
 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 17 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 18 * more details.
 19 *
 20 * You should have received a copy of the GNU General Public License
 21 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 22 *
 23 */
 24
 25#include <linux/module.h>
 26#include <linux/init.h>
 27#include <linux/slab.h>
 28#include <linux/err.h>
 29#include <linux/platform_device.h>
 30#include <linux/regulator/driver.h>
 31#include <linux/regulator/machine.h>
 32#include <linux/gpio.h>
 33#include <linux/mfd/rc5t583.h>
 34
 35struct rc5t583_regulator_info {
 36	int			deepsleep_id;
 37
 38	/* Regulator register address.*/
 39	uint8_t			reg_disc_reg;
 40	uint8_t			disc_bit;
 41	uint8_t			deepsleep_reg;
 42
 43	/* Regulator specific turn-on delay  and voltage settling time*/
 44	int			enable_uv_per_us;
 45	int			change_uv_per_us;
 46
 47	/* Used by regulator core */
 48	struct regulator_desc	desc;
 49};
 50
 51struct rc5t583_regulator {
 52	struct rc5t583_regulator_info *reg_info;
 53
 54	/* Devices */
 55	struct device		*dev;
 56	struct rc5t583		*mfd;
 57	struct regulator_dev	*rdev;
 58};
 59
 60static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
 61{
 62	struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
 63	int vsel = regulator_get_voltage_sel_regmap(rdev);
 64	int curr_uV = regulator_list_voltage_linear(rdev, vsel);
 65
 66	return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
 67}
 68
 69static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
 70		unsigned int old_selector, unsigned int new_selector)
 71{
 72	struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
 73	int old_uV, new_uV;
 74	old_uV = regulator_list_voltage_linear(rdev, old_selector);
 75
 76	if (old_uV < 0)
 77		return old_uV;
 78
 79	new_uV = regulator_list_voltage_linear(rdev, new_selector);
 80	if (new_uV < 0)
 81		return new_uV;
 82
 83	return DIV_ROUND_UP(abs(old_uV - new_uV),
 84				reg->reg_info->change_uv_per_us);
 85}
 86
 87
 88static struct regulator_ops rc5t583_ops = {
 89	.is_enabled		= regulator_is_enabled_regmap,
 90	.enable			= regulator_enable_regmap,
 91	.disable		= regulator_disable_regmap,
 92	.enable_time		= rc5t583_regulator_enable_time,
 93	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 94	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 95	.list_voltage		= regulator_list_voltage_linear,
 96	.map_voltage		= regulator_map_voltage_linear,
 97	.set_voltage_time_sel	= rc5t583_set_voltage_time_sel,
 98};
 99
100#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
101		_vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
102{								\
103	.reg_disc_reg	= RC5T583_REG_##_disc_reg,		\
104	.disc_bit	= _disc_bit,				\
105	.deepsleep_reg	= RC5T583_REG_##_id##DAC_DS,		\
106	.enable_uv_per_us = _enable_mv * 1000,			\
107	.change_uv_per_us = 40 * 1000,				\
108	.deepsleep_id	= RC5T583_DS_##_id,			\
109	.desc = {						\
110		.name = "rc5t583-regulator-"#_id,		\
111		.id = RC5T583_REGULATOR_##_id,			\
112		.n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
113		.ops = &rc5t583_ops,				\
114		.type = REGULATOR_VOLTAGE,			\
115		.owner = THIS_MODULE,				\
116		.vsel_reg = RC5T583_REG_##_id##DAC,		\
117		.vsel_mask = _vout_mask,			\
118		.enable_reg = RC5T583_REG_##_en_reg,		\
119		.enable_mask = BIT(_en_bit),			\
120		.min_uV	= _min_mv * 1000,			\
121		.uV_step = _step_uV,				\
122	},							\
123}
124
125static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
126	RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
127	RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
128	RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
129	RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
130	RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
131	RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
132	RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
133	RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
134	RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
135	RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
136	RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
137	RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
138	RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
139	RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
140};
141
142static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
143{
144	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
145	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
146	struct regulator_init_data *reg_data;
147	struct regulator_config config = { };
148	struct rc5t583_regulator *reg = NULL;
149	struct rc5t583_regulator *regs;
150	struct regulator_dev *rdev;
151	struct rc5t583_regulator_info *ri;
152	int ret;
153	int id;
154
155	if (!pdata) {
156		dev_err(&pdev->dev, "No platform data, exiting...\n");
157		return -ENODEV;
158	}
159
160	regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
161			sizeof(struct rc5t583_regulator), GFP_KERNEL);
162	if (!regs) {
163		dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
164		return -ENOMEM;
165	}
166
167
168	for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
169		reg_data = pdata->reg_init_data[id];
170
171		/* No need to register if there is no regulator data */
172		if (!reg_data)
173			continue;
174
175		reg = &regs[id];
176		ri = &rc5t583_reg_info[id];
177		reg->reg_info = ri;
178		reg->mfd = rc5t583;
179		reg->dev = &pdev->dev;
180
181		if (ri->deepsleep_id == RC5T583_DS_NONE)
182			goto skip_ext_pwr_config;
183
184		ret = rc5t583_ext_power_req_config(rc5t583->dev,
185				ri->deepsleep_id,
186				pdata->regulator_ext_pwr_control[id],
187				pdata->regulator_deepsleep_slot[id]);
188		/*
189		 * Configuring external control is not a major issue,
190		 * just give warning.
191		 */
192		if (ret < 0)
193			dev_warn(&pdev->dev,
194				"Failed to configure ext control %d\n", id);
195
196skip_ext_pwr_config:
197		config.dev = &pdev->dev;
198		config.init_data = reg_data;
199		config.driver_data = reg;
200		config.regmap = rc5t583->regmap;
201
202		rdev = regulator_register(&ri->desc, &config);
203		if (IS_ERR(rdev)) {
204			dev_err(&pdev->dev, "Failed to register regulator %s\n",
205						ri->desc.name);
206			ret = PTR_ERR(rdev);
207			goto clean_exit;
208		}
209		reg->rdev = rdev;
210	}
211	platform_set_drvdata(pdev, regs);
212	return 0;
213
214clean_exit:
215	while (--id >= 0)
216		regulator_unregister(regs[id].rdev);
217
218	return ret;
219}
220
221static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
222{
223	struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
224	int id;
225
226	for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
227		regulator_unregister(regs[id].rdev);
228	return 0;
229}
230
231static struct platform_driver rc5t583_regulator_driver = {
232	.driver	= {
233		.name	= "rc5t583-regulator",
234		.owner	= THIS_MODULE,
235	},
236	.probe		= rc5t583_regulator_probe,
237	.remove		= __devexit_p(rc5t583_regulator_remove),
238};
239
240static int __init rc5t583_regulator_init(void)
241{
242	return platform_driver_register(&rc5t583_regulator_driver);
243}
244subsys_initcall(rc5t583_regulator_init);
245
246static void __exit rc5t583_regulator_exit(void)
247{
248	platform_driver_unregister(&rc5t583_regulator_driver);
249}
250module_exit(rc5t583_regulator_exit);
251
252MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
253MODULE_DESCRIPTION("RC5T583 regulator driver");
254MODULE_ALIAS("platform:rc5t583-regulator");
255MODULE_LICENSE("GPL v2");