[deliverable/linux.git] / drivers / mfd / aat2870-core.c

/*
 * linux/drivers/mfd/aat2870-core.c
 *
 * Copyright (c) 2011, NVIDIA Corporation.
 * Author: Jin Park <jinyoungp@nvidia.com>
 *
 * 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.
 *
 * 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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/mfd/aat2870.h>
#include <linux/regulator/machine.h>

static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
	/* readable, writeable, value */
	{ 0, 1, 0x00 },	/* 0x00 AAT2870_BL_CH_EN */
	{ 0, 1, 0x16 },	/* 0x01 AAT2870_BLM */
	{ 0, 1, 0x16 },	/* 0x02 AAT2870_BLS */
	{ 0, 1, 0x56 },	/* 0x03 AAT2870_BL1 */
	{ 0, 1, 0x56 },	/* 0x04 AAT2870_BL2 */
	{ 0, 1, 0x56 },	/* 0x05 AAT2870_BL3 */
	{ 0, 1, 0x56 },	/* 0x06 AAT2870_BL4 */
	{ 0, 1, 0x56 },	/* 0x07 AAT2870_BL5 */
	{ 0, 1, 0x56 },	/* 0x08 AAT2870_BL6 */
	{ 0, 1, 0x56 },	/* 0x09 AAT2870_BL7 */
	{ 0, 1, 0x56 },	/* 0x0A AAT2870_BL8 */
	{ 0, 1, 0x00 },	/* 0x0B AAT2870_FLR */
	{ 0, 1, 0x03 },	/* 0x0C AAT2870_FM */
	{ 0, 1, 0x03 },	/* 0x0D AAT2870_FS */
	{ 0, 1, 0x10 },	/* 0x0E AAT2870_ALS_CFG0 */
	{ 0, 1, 0x06 },	/* 0x0F AAT2870_ALS_CFG1 */
	{ 0, 1, 0x00 },	/* 0x10 AAT2870_ALS_CFG2 */
	{ 1, 0, 0x00 },	/* 0x11 AAT2870_AMB */
	{ 0, 1, 0x00 },	/* 0x12 AAT2870_ALS0 */
	{ 0, 1, 0x00 },	/* 0x13 AAT2870_ALS1 */
	{ 0, 1, 0x00 },	/* 0x14 AAT2870_ALS2 */
	{ 0, 1, 0x00 },	/* 0x15 AAT2870_ALS3 */
	{ 0, 1, 0x00 },	/* 0x16 AAT2870_ALS4 */
	{ 0, 1, 0x00 },	/* 0x17 AAT2870_ALS5 */
	{ 0, 1, 0x00 },	/* 0x18 AAT2870_ALS6 */
	{ 0, 1, 0x00 },	/* 0x19 AAT2870_ALS7 */
	{ 0, 1, 0x00 },	/* 0x1A AAT2870_ALS8 */
	{ 0, 1, 0x00 },	/* 0x1B AAT2870_ALS9 */
	{ 0, 1, 0x00 },	/* 0x1C AAT2870_ALSA */
	{ 0, 1, 0x00 },	/* 0x1D AAT2870_ALSB */
	{ 0, 1, 0x00 },	/* 0x1E AAT2870_ALSC */
	{ 0, 1, 0x00 },	/* 0x1F AAT2870_ALSD */
	{ 0, 1, 0x00 },	/* 0x20 AAT2870_ALSE */
	{ 0, 1, 0x00 },	/* 0x21 AAT2870_ALSF */
	{ 0, 1, 0x00 },	/* 0x22 AAT2870_SUB_SET */
	{ 0, 1, 0x00 },	/* 0x23 AAT2870_SUB_CTRL */
	{ 0, 1, 0x00 },	/* 0x24 AAT2870_LDO_AB */
	{ 0, 1, 0x00 },	/* 0x25 AAT2870_LDO_CD */
	{ 0, 1, 0x00 },	/* 0x26 AAT2870_LDO_EN */
};

static struct mfd_cell aat2870_devs[] = {
	{
		.name = "aat2870-backlight",
		.id = AAT2870_ID_BL,
		.pdata_size = sizeof(struct aat2870_bl_platform_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOA,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOB,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOC,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOD,
		.pdata_size = sizeof(struct regulator_init_data),
	},
};

static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
{
	int ret;

	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
		return -EINVAL;
	}

	if (!aat2870->reg_cache[addr].readable) {
		*val = aat2870->reg_cache[addr].value;
		goto out;
	}

	ret = i2c_master_send(aat2870->client, &addr, 1);
	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;

	ret = i2c_master_recv(aat2870->client, val, 1);
	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;

out:
	dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
	return 0;
}

static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
{
	u8 msg[2];
	int ret;

	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
		return -EINVAL;
	}

	if (!aat2870->reg_cache[addr].writeable) {
		dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
			addr);
		return -EINVAL;
	}

	msg[0] = addr;
	msg[1] = val;
	ret = i2c_master_send(aat2870->client, msg, 2);
	if (ret < 0)
		return ret;
	if (ret != 2)
		return -EIO;

	aat2870->reg_cache[addr].value = val;

	dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
	return 0;
}

static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
{
	int ret;

	mutex_lock(&aat2870->io_lock);
	ret = __aat2870_read(aat2870, addr, val);
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
{
	int ret;

	mutex_lock(&aat2870->io_lock);
	ret = __aat2870_write(aat2870, addr, val);
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
			  u8 val)
{
	int change;
	u8 old_val, new_val;
	int ret;

	mutex_lock(&aat2870->io_lock);

	ret = __aat2870_read(aat2870, addr, &old_val);
	if (ret)
		goto out_unlock;

	new_val = (old_val & ~mask) | (val & mask);
	change = old_val != new_val;
	if (change)
		ret = __aat2870_write(aat2870, addr, new_val);

out_unlock:
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static inline void aat2870_enable(struct aat2870_data *aat2870)
{
	if (aat2870->en_pin >= 0)
		gpio_set_value(aat2870->en_pin, 1);

	aat2870->is_enable = 1;
}

static inline void aat2870_disable(struct aat2870_data *aat2870)
{
	if (aat2870->en_pin >= 0)
		gpio_set_value(aat2870->en_pin, 0);

	aat2870->is_enable = 0;
}

#ifdef CONFIG_DEBUG_FS
static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
{
	u8 addr, val;
	ssize_t count = 0;
	int ret;

	count += sprintf(buf, "aat2870 registers\n");
	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
		count += sprintf(buf + count, "0x%02x: ", addr);
		if (count >= PAGE_SIZE - 1)
			break;

		ret = aat2870->read(aat2870, addr, &val);
		if (ret == 0)
			count += snprintf(buf + count, PAGE_SIZE - count,
					  "0x%02x", val);
		else
			count += snprintf(buf + count, PAGE_SIZE - count,
					  "<read fail: %d>", ret);

		if (count >= PAGE_SIZE - 1)
			break;

		count += snprintf(buf + count, PAGE_SIZE - count, "\n");
		if (count >= PAGE_SIZE - 1)
			break;
	}

	/* Truncate count; min() would cause a warning */
	if (count >= PAGE_SIZE)
		count = PAGE_SIZE - 1;

	return count;
}

static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
				     size_t count, loff_t *ppos)
{
	struct aat2870_data *aat2870 = file->private_data;
	char *buf;
	ssize_t ret;

	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = aat2870_dump_reg(aat2870, buf);
	if (ret >= 0)
		ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

	kfree(buf);

	return ret;
}

static ssize_t aat2870_reg_write_file(struct file *file,
				      const char __user *user_buf, size_t count,
				      loff_t *ppos)
{
	struct aat2870_data *aat2870 = file->private_data;
	char buf[32];
	ssize_t buf_size;
	char *start = buf;
	unsigned long addr, val;
	int ret;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size)) {
		dev_err(aat2870->dev, "Failed to copy from user\n");
		return -EFAULT;
	}
	buf[buf_size] = 0;

	while (*start == ' ')
		start++;

	addr = simple_strtoul(start, &start, 16);
	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
		return -EINVAL;
	}

	while (*start == ' ')
		start++;

	ret = kstrtoul(start, 16, &val);
	if (ret)
		return ret;

	ret = aat2870->write(aat2870, (u8)addr, (u8)val);
	if (ret)
		return ret;

	return buf_size;
}

static const struct file_operations aat2870_reg_fops = {
	.open = simple_open,
	.read = aat2870_reg_read_file,
	.write = aat2870_reg_write_file,
};

static void aat2870_init_debugfs(struct aat2870_data *aat2870)
{
	aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
	if (!aat2870->dentry_root) {
		dev_warn(aat2870->dev,
			 "Failed to create debugfs root directory\n");
		return;
	}

	aat2870->dentry_reg = debugfs_create_file("regs", 0644,
						  aat2870->dentry_root,
						  aat2870, &aat2870_reg_fops);
	if (!aat2870->dentry_reg)
		dev_warn(aat2870->dev,
			 "Failed to create debugfs register file\n");
}

static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
{
	debugfs_remove_recursive(aat2870->dentry_root);
}
#else
static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
{
}

static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
{
}
#endif /* CONFIG_DEBUG_FS */

static int aat2870_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct aat2870_platform_data *pdata = client->dev.platform_data;
	struct aat2870_data *aat2870;
	int i, j;
	int ret = 0;

	aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
				GFP_KERNEL);
	if (!aat2870) {
		dev_err(&client->dev,
			"Failed to allocate memory for aat2870\n");
		return -ENOMEM;
	}

	aat2870->dev = &client->dev;
	dev_set_drvdata(aat2870->dev, aat2870);

	aat2870->client = client;
	i2c_set_clientdata(client, aat2870);

	aat2870->reg_cache = aat2870_regs;

	if (pdata->en_pin < 0)
		aat2870->en_pin = -1;
	else
		aat2870->en_pin = pdata->en_pin;

	aat2870->init = pdata->init;
	aat2870->uninit = pdata->uninit;
	aat2870->read = aat2870_read;
	aat2870->write = aat2870_write;
	aat2870->update = aat2870_update;

	mutex_init(&aat2870->io_lock);

	if (aat2870->init)
		aat2870->init(aat2870);

	if (aat2870->en_pin >= 0) {
		ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
					GPIOF_OUT_INIT_HIGH, "aat2870-en");
		if (ret < 0) {
			dev_err(&client->dev,
				"Failed to request GPIO %d\n", aat2870->en_pin);
			return ret;
		}
	}

	aat2870_enable(aat2870);

	for (i = 0; i < pdata->num_subdevs; i++) {
		for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
			if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
					!strcmp(pdata->subdevs[i].name,
						aat2870_devs[j].name)) {
				aat2870_devs[j].platform_data =
					pdata->subdevs[i].platform_data;
				break;
			}
		}
	}

	ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
			      ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
	if (ret != 0) {
		dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
		goto out_disable;
	}

	aat2870_init_debugfs(aat2870);

	return 0;

out_disable:
	aat2870_disable(aat2870);
	return ret;
}

static int aat2870_i2c_remove(struct i2c_client *client)
{
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);

	aat2870_uninit_debugfs(aat2870);

	mfd_remove_devices(aat2870->dev);
	aat2870_disable(aat2870);
	if (aat2870->uninit)
		aat2870->uninit(aat2870);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int aat2870_i2c_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);

	aat2870_disable(aat2870);

	return 0;
}

static int aat2870_i2c_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
	struct aat2870_register *reg = NULL;
	int i;

	aat2870_enable(aat2870);

	/* restore registers */
	for (i = 0; i < AAT2870_REG_NUM; i++) {
		reg = &aat2870->reg_cache[i];
		if (reg->writeable)
			aat2870->write(aat2870, i, reg->value);
	}

	return 0;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
			 aat2870_i2c_resume);

static const struct i2c_device_id aat2870_i2c_id_table[] = {
	{ "aat2870", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);

static struct i2c_driver aat2870_i2c_driver = {
	.driver = {
		.name	= "aat2870",
		.owner	= THIS_MODULE,
		.pm	= &aat2870_pm_ops,
	},
	.probe		= aat2870_i2c_probe,
	.remove		= aat2870_i2c_remove,
	.id_table	= aat2870_i2c_id_table,
};

static int __init aat2870_init(void)
{
	return i2c_add_driver(&aat2870_i2c_driver);
}
subsys_initcall(aat2870_init);

static void __exit aat2870_exit(void)
{
	i2c_del_driver(&aat2870_i2c_driver);
}
module_exit(aat2870_exit);

MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
Commit	Line	Data
09d6292b JP	1	/*
	2	* linux/drivers/mfd/aat2870-core.c
	3	*
	4	* Copyright (c) 2011, NVIDIA Corporation.
	5	* Author: Jin Park <jinyoungp@nvidia.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/debugfs.h>
	26	#include <linux/slab.h>
	27	#include <linux/uaccess.h>
	28	#include <linux/i2c.h>
	29	#include <linux/delay.h>
	30	#include <linux/gpio.h>
	31	#include <linux/mfd/core.h>
	32	#include <linux/mfd/aat2870.h>
	33	#include <linux/regulator/machine.h>
	34
	35	static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
	36	/* readable, writeable, value */
	37	{ 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
	38	{ 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
	39	{ 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
	40	{ 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
	41	{ 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
	42	{ 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
	43	{ 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
	44	{ 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
	45	{ 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
	46	{ 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
	47	{ 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
	48	{ 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
	49	{ 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
	50	{ 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
	51	{ 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
	52	{ 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
	53	{ 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
	54	{ 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
	55	{ 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
	56	{ 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
	57	{ 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
	58	{ 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
	59	{ 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
	60	{ 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
	61	{ 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
	62	{ 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
	63	{ 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
	64	{ 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
65	{ 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
66	{ 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
67	{ 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
68	{ 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
69	{ 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
70	{ 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
71	{ 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
72	{ 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
73	{ 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
74	{ 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
75	{ 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
76	};
77
78	static struct mfd_cell aat2870_devs[] = {
79	{
80	.name = "aat2870-backlight",
81	.id = AAT2870_ID_BL,
82	.pdata_size = sizeof(struct aat2870_bl_platform_data),
83	},
84	{
85	.name = "aat2870-regulator",
86	.id = AAT2870_ID_LDOA,
87	.pdata_size = sizeof(struct regulator_init_data),
88	},
89	{
90	.name = "aat2870-regulator",
91	.id = AAT2870_ID_LDOB,
92	.pdata_size = sizeof(struct regulator_init_data),
93	},
94	{
95	.name = "aat2870-regulator",
96	.id = AAT2870_ID_LDOC,
97	.pdata_size = sizeof(struct regulator_init_data),
98	},
99	{
100	.name = "aat2870-regulator",
101	.id = AAT2870_ID_LDOD,
102	.pdata_size = sizeof(struct regulator_init_data),
103	},
104	};
105
106	static int __aat2870_read(struct aat2870_data aat2870, u8 addr, u8 val)
107	{
108	int ret;
109
110	if (addr >= AAT2870_REG_NUM) {
111	dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
112	return -EINVAL;
113	}
114
115	if (!aat2870->reg_cache[addr].readable) {
116	*val = aat2870->reg_cache[addr].value;
117	goto out;
118	}
119
120	ret = i2c_master_send(aat2870->client, &addr, 1);
121	if (ret < 0)
122	return ret;
123	if (ret != 1)
124	return -EIO;
125
126	ret = i2c_master_recv(aat2870->client, val, 1);
127	if (ret < 0)
128	return ret;
129	if (ret != 1)
130	return -EIO;
131
132	out:
133	dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
134	return 0;
135	}
136
137	static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
138	{
139	u8 msg[2];
140	int ret;
141
142	if (addr >= AAT2870_REG_NUM) {
143	dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
144	return -EINVAL;
145	}
146
147	if (!aat2870->reg_cache[addr].writeable) {
148	dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
149	addr);
150	return -EINVAL;
151	}
152
153	msg[0] = addr;
154	msg[1] = val;
155	ret = i2c_master_send(aat2870->client, msg, 2);
156	if (ret < 0)
157	return ret;
158	if (ret != 2)
159	return -EIO;
160
161	aat2870->reg_cache[addr].value = val;
162
163	dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
164	return 0;
165	}
166
167	static int aat2870_read(struct aat2870_data aat2870, u8 addr, u8 val)
168	{
169	int ret;
170
171	mutex_lock(&aat2870->io_lock);
172	ret = __aat2870_read(aat2870, addr, val);
173	mutex_unlock(&aat2870->io_lock);
174
175	return ret;
176	}
177
178	static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
179	{
180	int ret;
181
182	mutex_lock(&aat2870->io_lock);
183	ret = __aat2870_write(aat2870, addr, val);
184	mutex_unlock(&aat2870->io_lock);
185
186	return ret;
187	}
188
189	static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
190	u8 val)
191	{
192	int change;
193	u8 old_val, new_val;
194	int ret;
195
196	mutex_lock(&aat2870->io_lock);
197
198	ret = __aat2870_read(aat2870, addr, &old_val);
199	if (ret)
200	goto out_unlock;
201
202	new_val = (old_val & ~mask) \| (val & mask);
203	change = old_val != new_val;
204	if (change)
205	ret = __aat2870_write(aat2870, addr, new_val);
206
207	out_unlock:
208	mutex_unlock(&aat2870->io_lock);
209
210	return ret;
211	}
212
213	static inline void aat2870_enable(struct aat2870_data *aat2870)
214	{
215	if (aat2870->en_pin >= 0)
216	gpio_set_value(aat2870->en_pin, 1);
217
218	aat2870->is_enable = 1;
219	}
220
221	static inline void aat2870_disable(struct aat2870_data *aat2870)
222	{
223	if (aat2870->en_pin >= 0)
224	gpio_set_value(aat2870->en_pin, 0);
225
226	aat2870->is_enable = 0;
227	}
228
229	#ifdef CONFIG_DEBUG_FS
230	static ssize_t aat2870_dump_reg(struct aat2870_data aat2870, char buf)
231	{
232	u8 addr, val;
233	ssize_t count = 0;
234	int ret;
235
236	count += sprintf(buf, "aat2870 registers\n");
237	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
238	count += sprintf(buf + count, "0x%02x: ", addr);
239	if (count >= PAGE_SIZE - 1)
240	break;
241
242	ret = aat2870->read(aat2870, addr, &val);
243	if (ret == 0)
244	count += snprintf(buf + count, PAGE_SIZE - count,
245	"0x%02x", val);
246	else
247	count += snprintf(buf + count, PAGE_SIZE - count,
248	"<read fail: %d>", ret);
249
250	if (count >= PAGE_SIZE - 1)
251	break;
252
253	count += snprintf(buf + count, PAGE_SIZE - count, "\n");
254	if (count >= PAGE_SIZE - 1)
255	break;
256	}
257
258	/* Truncate count; min() would cause a warning */
259	if (count >= PAGE_SIZE)
260	count = PAGE_SIZE - 1;
261
262	return count;
263	}
264
09d6292b JP	265	static ssize_t aat2870_reg_read_file(struct file file, char __user user_buf,
	266	size_t count, loff_t *ppos)
	267	{
	268	struct aat2870_data *aat2870 = file->private_data;
	269	char *buf;
	270	ssize_t ret;
	271
	272	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	273	if (!buf)
	274	return -ENOMEM;
	275
	276	ret = aat2870_dump_reg(aat2870, buf);
	277	if (ret >= 0)
	278	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
	279
	280	kfree(buf);
	281
	282	return ret;
	283	}
	284
	285	static ssize_t aat2870_reg_write_file(struct file *file,
	286	const char __user *user_buf, size_t count,
	287	loff_t *ppos)
	288	{
	289	struct aat2870_data *aat2870 = file->private_data;
	290	char buf[32];
c38d66ac	291	ssize_t buf_size;
09d6292b JP	292	char *start = buf;
	293	unsigned long addr, val;
	294	int ret;
	295
	296	buf_size = min(count, (sizeof(buf)-1));
	297	if (copy_from_user(buf, user_buf, buf_size)) {
	298	dev_err(aat2870->dev, "Failed to copy from user\n");
	299	return -EFAULT;
	300	}
	301	buf[buf_size] = 0;
	302
	303	while (*start == ' ')
	304	start++;
	305
	306	addr = simple_strtoul(start, &start, 16);
	307	if (addr >= AAT2870_REG_NUM) {
	308	dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
	309	return -EINVAL;
	310	}
	311
	312	while (*start == ' ')
	313	start++;
	314
8420a241 JH	315	ret = kstrtoul(start, 16, &val);
	316	if (ret)
	317	return ret;
09d6292b JP	318
	319	ret = aat2870->write(aat2870, (u8)addr, (u8)val);
	320	if (ret)
	321	return ret;
	322
	323	return buf_size;
	324	}
	325
	326	static const struct file_operations aat2870_reg_fops = {
234e3405	327	.open = simple_open,
09d6292b JP	328	.read = aat2870_reg_read_file,
	329	.write = aat2870_reg_write_file,
	330	};
	331
	332	static void aat2870_init_debugfs(struct aat2870_data *aat2870)
	333	{
	334	aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
	335	if (!aat2870->dentry_root) {
	336	dev_warn(aat2870->dev,
	337	"Failed to create debugfs root directory\n");
	338	return;
	339	}
	340
	341	aat2870->dentry_reg = debugfs_create_file("regs", 0644,
	342	aat2870->dentry_root,
	343	aat2870, &aat2870_reg_fops);
	344	if (!aat2870->dentry_reg)
	345	dev_warn(aat2870->dev,
	346	"Failed to create debugfs register file\n");
	347	}
	348
	349	static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
	350	{
	351	debugfs_remove_recursive(aat2870->dentry_root);
	352	}
	353	#else
	354	static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
	355	{
	356	}
	357
	358	static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
	359	{
	360	}
	361	#endif /* CONFIG_DEBUG_FS */
	362
	363	static int aat2870_i2c_probe(struct i2c_client *client,
	364	const struct i2c_device_id *id)
	365	{
	366	struct aat2870_platform_data *pdata = client->dev.platform_data;
	367	struct aat2870_data *aat2870;
	368	int i, j;
	369	int ret = 0;
	370
0287714b JH	371	aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
0287714b JH	372	GFP_KERNEL);
09d6292b JP	373	if (!aat2870) {
	374	dev_err(&client->dev,
	375	"Failed to allocate memory for aat2870\n");
0287714b	376	return -ENOMEM;
09d6292b JP	377	}
	378
	379	aat2870->dev = &client->dev;
	380	dev_set_drvdata(aat2870->dev, aat2870);
	381
	382	aat2870->client = client;
	383	i2c_set_clientdata(client, aat2870);
	384
	385	aat2870->reg_cache = aat2870_regs;
	386
	387	if (pdata->en_pin < 0)
	388	aat2870->en_pin = -1;
	389	else
	390	aat2870->en_pin = pdata->en_pin;
	391
	392	aat2870->init = pdata->init;
	393	aat2870->uninit = pdata->uninit;
	394	aat2870->read = aat2870_read;
	395	aat2870->write = aat2870_write;
	396	aat2870->update = aat2870_update;
	397
	398	mutex_init(&aat2870->io_lock);
	399
	400	if (aat2870->init)
	401	aat2870->init(aat2870);
	402
	403	if (aat2870->en_pin >= 0) {
0287714b JH	404	ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
0287714b JH	405	GPIOF_OUT_INIT_HIGH, "aat2870-en");
09d6292b JP	406	if (ret < 0) {
	407	dev_err(&client->dev,
	408	"Failed to request GPIO %d\n", aat2870->en_pin);
0287714b	409	return ret;
09d6292b	410	}
09d6292b JP	411	}
	412
	413	aat2870_enable(aat2870);
	414
	415	for (i = 0; i < pdata->num_subdevs; i++) {
	416	for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
	417	if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
	418	!strcmp(pdata->subdevs[i].name,
	419	aat2870_devs[j].name)) {
	420	aat2870_devs[j].platform_data =
	421	pdata->subdevs[i].platform_data;
	422	break;
	423	}
	424	}
	425	}
	426
	427	ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
0848c94f	428	ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
09d6292b JP	429	if (ret != 0) {
	430	dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
	431	goto out_disable;
	432	}
	433
	434	aat2870_init_debugfs(aat2870);
	435
	436	return 0;
	437
	438	out_disable:
	439	aat2870_disable(aat2870);
09d6292b JP	440	return ret;
	441	}
	442
	443	static int aat2870_i2c_remove(struct i2c_client *client)
	444	{
	445	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
	446
	447	aat2870_uninit_debugfs(aat2870);
	448
	449	mfd_remove_devices(aat2870->dev);
	450	aat2870_disable(aat2870);
09d6292b JP	451	if (aat2870->uninit)
09d6292b JP	452	aat2870->uninit(aat2870);
09d6292b JP	453
	454	return 0;
	455	}
	456
5214e565 MB	457	#ifdef CONFIG_PM_SLEEP
5214e565 MB	458	static int aat2870_i2c_suspend(struct device *dev)
09d6292b	459	{
5214e565	460	struct i2c_client *client = to_i2c_client(dev);
09d6292b JP	461	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
	462
	463	aat2870_disable(aat2870);
	464
	465	return 0;
	466	}
	467
5214e565	468	static int aat2870_i2c_resume(struct device *dev)
09d6292b	469	{
5214e565	470	struct i2c_client *client = to_i2c_client(dev);
09d6292b JP	471	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
	472	struct aat2870_register *reg = NULL;
	473	int i;
	474
	475	aat2870_enable(aat2870);
	476
	477	/* restore registers */
	478	for (i = 0; i < AAT2870_REG_NUM; i++) {
	479	reg = &aat2870->reg_cache[i];
	480	if (reg->writeable)
	481	aat2870->write(aat2870, i, reg->value);
	482	}
	483
	484	return 0;
	485	}
5214e565 MB	486	#endif /* CONFIG_PM_SLEEP */
	487
	488	static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
	489	aat2870_i2c_resume);
09d6292b	490
d4e94863	491	static const struct i2c_device_id aat2870_i2c_id_table[] = {
09d6292b JP	492	{ "aat2870", 0 },
	493	{ }
	494	};
	495	MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
	496
	497	static struct i2c_driver aat2870_i2c_driver = {
	498	.driver = {
	499	.name = "aat2870",
	500	.owner = THIS_MODULE,
5214e565	501	.pm = &aat2870_pm_ops,
09d6292b JP	502	},
	503	.probe = aat2870_i2c_probe,
	504	.remove = aat2870_i2c_remove,
09d6292b JP	505	.id_table = aat2870_i2c_id_table,
	506	};
	507
	508	static int __init aat2870_init(void)
	509	{
	510	return i2c_add_driver(&aat2870_i2c_driver);
	511	}
	512	subsys_initcall(aat2870_init);
	513
	514	static void __exit aat2870_exit(void)
	515	{
	516	i2c_del_driver(&aat2870_i2c_driver);
	517	}
	518	module_exit(aat2870_exit);
	519
	520	MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
	521	MODULE_LICENSE("GPL");
	522	MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");