1/*
  2 * MFD core driver for Rockchip RK808
  3 *
  4 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
  5 *
  6 * Author: Chris Zhong <zyw@rock-chips.com>
  7 * Author: Zhang Qing <zhangqing@rock-chips.com>
  8 *
  9 * This program is free software; you can redistribute it and/or modify it
 10 * under the terms and conditions of the GNU General Public License,
 11 * version 2, as published by the Free Software Foundation.
 12 *
 13 * This program is distributed in the hope it will be useful, but WITHOUT
 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 15 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 16 * more details.
 17 */
 18
 19#include <linux/i2c.h>
 20#include <linux/interrupt.h>
 21#include <linux/mfd/rk808.h>
 22#include <linux/mfd/core.h>
 23#include <linux/module.h>
 24#include <linux/regmap.h>
 25
 26struct rk808_reg_data {
 27	int addr;
 28	int mask;
 29	int value;
 30};
 31
 32static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
 33{
 34	/*
 35	 * Notes:
 36	 * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
 37	 *   we don't use that feature.  It's better to cache.
 38	 * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
 39	 *   bits are cleared in case when we shutoff anyway, but better safe.
 40	 */
 41
 42	switch (reg) {
 43	case RK808_SECONDS_REG ... RK808_WEEKS_REG:
 44	case RK808_RTC_STATUS_REG:
 45	case RK808_VB_MON_REG:
 46	case RK808_THERMAL_REG:
 47	case RK808_DCDC_UV_STS_REG:
 48	case RK808_LDO_UV_STS_REG:
 49	case RK808_DCDC_PG_REG:
 50	case RK808_LDO_PG_REG:
 51	case RK808_DEVCTRL_REG:
 52	case RK808_INT_STS_REG1:
 53	case RK808_INT_STS_REG2:
 54		return true;
 55	}
 56
 57	return false;
 58}
 59
 60static const struct regmap_config rk808_regmap_config = {
 61	.reg_bits = 8,
 62	.val_bits = 8,
 63	.max_register = RK808_IO_POL_REG,
 64	.cache_type = REGCACHE_RBTREE,
 65	.volatile_reg = rk808_is_volatile_reg,
 66};
 67
 68static struct resource rtc_resources[] = {
 69	{
 70		.start  = RK808_IRQ_RTC_ALARM,
 71		.end    = RK808_IRQ_RTC_ALARM,
 72		.flags  = IORESOURCE_IRQ,
 73	}
 74};
 75
 76static const struct mfd_cell rk808s[] = {
 77	{ .name = "rk808-clkout", },
 78	{ .name = "rk808-regulator", },
 79	{
 80		.name = "rk808-rtc",
 81		.num_resources = ARRAY_SIZE(rtc_resources),
 82		.resources = &rtc_resources[0],
 83	},
 84};
 85
 86static const struct rk808_reg_data pre_init_reg[] = {
 87	{ RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_150MA },
 88	{ RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_200MA },
 89	{ RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
 90	{ RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK,  BUCK_ILMIN_200MA },
 91	{ RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_200MA },
 92	{ RK808_DCDC_UV_ACT_REG,  BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE},
 93	{ RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
 94						    VB_LO_SEL_3500MV },
 95};
 96
 97static const struct regmap_irq rk808_irqs[] = {
 98	/* INT_STS */
 99	[RK808_IRQ_VOUT_LO] = {
100		.mask = RK808_IRQ_VOUT_LO_MSK,
101		.reg_offset = 0,
102	},
103	[RK808_IRQ_VB_LO] = {
104		.mask = RK808_IRQ_VB_LO_MSK,
105		.reg_offset = 0,
106	},
107	[RK808_IRQ_PWRON] = {
108		.mask = RK808_IRQ_PWRON_MSK,
109		.reg_offset = 0,
110	},
111	[RK808_IRQ_PWRON_LP] = {
112		.mask = RK808_IRQ_PWRON_LP_MSK,
113		.reg_offset = 0,
114	},
115	[RK808_IRQ_HOTDIE] = {
116		.mask = RK808_IRQ_HOTDIE_MSK,
117		.reg_offset = 0,
118	},
119	[RK808_IRQ_RTC_ALARM] = {
120		.mask = RK808_IRQ_RTC_ALARM_MSK,
121		.reg_offset = 0,
122	},
123	[RK808_IRQ_RTC_PERIOD] = {
124		.mask = RK808_IRQ_RTC_PERIOD_MSK,
125		.reg_offset = 0,
126	},
127
128	/* INT_STS2 */
129	[RK808_IRQ_PLUG_IN_INT] = {
130		.mask = RK808_IRQ_PLUG_IN_INT_MSK,
131		.reg_offset = 1,
132	},
133	[RK808_IRQ_PLUG_OUT_INT] = {
134		.mask = RK808_IRQ_PLUG_OUT_INT_MSK,
135		.reg_offset = 1,
136	},
137};
138
139static struct regmap_irq_chip rk808_irq_chip = {
140	.name = "rk808",
141	.irqs = rk808_irqs,
142	.num_irqs = ARRAY_SIZE(rk808_irqs),
143	.num_regs = 2,
144	.irq_reg_stride = 2,
145	.status_base = RK808_INT_STS_REG1,
146	.mask_base = RK808_INT_STS_MSK_REG1,
147	.ack_base = RK808_INT_STS_REG1,
148	.init_ack_masked = true,
149};
150
151static struct i2c_client *rk808_i2c_client;
152static void rk808_device_shutdown(void)
153{
154	int ret;
155	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
156
157	if (!rk808) {
158		dev_warn(&rk808_i2c_client->dev,
159			 "have no rk808, so do nothing here\n");
160		return;
161	}
162
163	ret = regmap_update_bits(rk808->regmap,
164				 RK808_DEVCTRL_REG,
165				 DEV_OFF_RST, DEV_OFF_RST);
166	if (ret)
167		dev_err(&rk808_i2c_client->dev, "power off error!\n");
168}
169
170static int rk808_probe(struct i2c_client *client,
171		       const struct i2c_device_id *id)
172{
173	struct device_node *np = client->dev.of_node;
174	struct rk808 *rk808;
175	int pm_off = 0;
176	int ret;
177	int i;
178
179	if (!client->irq) {
180		dev_err(&client->dev, "No interrupt support, no core IRQ\n");
181		return -EINVAL;
182	}
183
184	rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
185	if (!rk808)
186		return -ENOMEM;
187
188	rk808->regmap = devm_regmap_init_i2c(client, &rk808_regmap_config);
189	if (IS_ERR(rk808->regmap)) {
190		dev_err(&client->dev, "regmap initialization failed\n");
191		return PTR_ERR(rk808->regmap);
192	}
193
194	for (i = 0; i < ARRAY_SIZE(pre_init_reg); i++) {
195		ret = regmap_update_bits(rk808->regmap, pre_init_reg[i].addr,
196					 pre_init_reg[i].mask,
197					 pre_init_reg[i].value);
198		if (ret) {
199			dev_err(&client->dev,
200				"0x%x write err\n", pre_init_reg[i].addr);
201			return ret;
202		}
203	}
204
205	ret = regmap_add_irq_chip(rk808->regmap, client->irq,
206				  IRQF_ONESHOT, -1,
207				  &rk808_irq_chip, &rk808->irq_data);
208	if (ret) {
209		dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
210		return ret;
211	}
212
213	rk808->i2c = client;
214	i2c_set_clientdata(client, rk808);
215
216	ret = mfd_add_devices(&client->dev, -1,
217			      rk808s, ARRAY_SIZE(rk808s),
218			      NULL, 0, regmap_irq_get_domain(rk808->irq_data));
219	if (ret) {
220		dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
221		goto err_irq;
222	}
223
224	pm_off = of_property_read_bool(np,
225				"rockchip,system-power-controller");
226	if (pm_off && !pm_power_off) {
227		rk808_i2c_client = client;
228		pm_power_off = rk808_device_shutdown;
229	}
230
231	return 0;
232
233err_irq:
234	regmap_del_irq_chip(client->irq, rk808->irq_data);
235	return ret;
236}
237
238static int rk808_remove(struct i2c_client *client)
239{
240	struct rk808 *rk808 = i2c_get_clientdata(client);
241
242	regmap_del_irq_chip(client->irq, rk808->irq_data);
243	mfd_remove_devices(&client->dev);
244	pm_power_off = NULL;
245
246	return 0;
247}
248
249static const struct of_device_id rk808_of_match[] = {
250	{ .compatible = "rockchip,rk808" },
251	{ },
252};
253MODULE_DEVICE_TABLE(of, rk808_of_match);
254
255static const struct i2c_device_id rk808_ids[] = {
256	{ "rk808" },
257	{ },
258};
259MODULE_DEVICE_TABLE(i2c, rk808_ids);
260
261static struct i2c_driver rk808_i2c_driver = {
262	.driver = {
263		.name = "rk808",
264		.of_match_table = rk808_of_match,
265	},
266	.probe    = rk808_probe,
267	.remove   = rk808_remove,
268	.id_table = rk808_ids,
269};
270
271module_i2c_driver(rk808_i2c_driver);
272
273MODULE_LICENSE("GPL");
274MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
275MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
276MODULE_DESCRIPTION("RK808 PMIC driver");