[net-next-2.6.git] / drivers / mfd / tc35892.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License, version 2
 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tc35892.h>

/**
 * tc35892_reg_read() - read a single TC35892 register
 * @tc35892:	Device to read from
 * @reg:	Register to read
 */
int tc35892_reg_read(struct tc35892 *tc35892, u8 reg)
{
	int ret;

	ret = i2c_smbus_read_byte_data(tc35892->i2c, reg);
	if (ret < 0)
		dev_err(tc35892->dev, "failed to read reg %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc35892_reg_read);

/**
 * tc35892_reg_read() - write a single TC35892 register
 * @tc35892:	Device to write to
 * @reg:	Register to read
 * @data:	Value to write
 */
int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data)
{
	int ret;

	ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data);
	if (ret < 0)
		dev_err(tc35892->dev, "failed to write reg %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc35892_reg_write);

/**
 * tc35892_block_read() - read multiple TC35892 registers
 * @tc35892:	Device to read from
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Buffer to write to
 */
int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length, u8 *values)
{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values);
	if (ret < 0)
		dev_err(tc35892->dev, "failed to read regs %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc35892_block_read);

/**
 * tc35892_block_write() - write multiple TC35892 registers
 * @tc35892:	Device to write to
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Values to write
 */
int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,
			const u8 *values)
{
	int ret;

	ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length,
					     values);
	if (ret < 0)
		dev_err(tc35892->dev, "failed to write regs %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc35892_block_write);

/**
 * tc35892_set_bits() - set the value of a bitfield in a TC35892 register
 * @tc35892:	Device to write to
 * @reg:	Register to write
 * @mask:	Mask of bits to set
 * @values:	Value to set
 */
int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val)
{
	int ret;

	mutex_lock(&tc35892->lock);

	ret = tc35892_reg_read(tc35892, reg);
	if (ret < 0)
		goto out;

	ret &= ~mask;
	ret |= val;

	ret = tc35892_reg_write(tc35892, reg, ret);

out:
	mutex_unlock(&tc35892->lock);
	return ret;
}
EXPORT_SYMBOL_GPL(tc35892_set_bits);

static struct resource gpio_resources[] = {
	{
		.start	= TC35892_INT_GPIIRQ,
		.end	= TC35892_INT_GPIIRQ,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell tc35892_devs[] = {
	{
		.name		= "tc35892-gpio",
		.num_resources	= ARRAY_SIZE(gpio_resources),
		.resources	= &gpio_resources[0],
	},
};

static irqreturn_t tc35892_irq(int irq, void *data)
{
	struct tc35892 *tc35892 = data;
	int status;

	status = tc35892_reg_read(tc35892, TC35892_IRQST);
	if (status < 0)
		return IRQ_NONE;

	while (status) {
		int bit = __ffs(status);

		handle_nested_irq(tc35892->irq_base + bit);
		status &= ~(1 << bit);
	}

	/*
	 * A dummy read or write (to any register) appears to be necessary to
	 * have the last interrupt clear (for example, GPIO IC write) take
	 * effect.
	 */
	tc35892_reg_read(tc35892, TC35892_IRQST);

	return IRQ_HANDLED;
}

static void tc35892_irq_dummy(unsigned int irq)
{
	/* No mask/unmask at this level */
}

static struct irq_chip tc35892_irq_chip = {
	.name	= "tc35892",
	.mask	= tc35892_irq_dummy,
	.unmask	= tc35892_irq_dummy,
};

static int tc35892_irq_init(struct tc35892 *tc35892)
{
	int base = tc35892->irq_base;
	int irq;

	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
		set_irq_chip_data(irq, tc35892);
		set_irq_chip_and_handler(irq, &tc35892_irq_chip,
					 handle_edge_irq);
		set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(irq, IRQF_VALID);
#else
		set_irq_noprobe(irq);
#endif
	}

	return 0;
}

static void tc35892_irq_remove(struct tc35892 *tc35892)
{
	int base = tc35892->irq_base;
	int irq;

	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
#ifdef CONFIG_ARM
		set_irq_flags(irq, 0);
#endif
		set_irq_chip_and_handler(irq, NULL, NULL);
		set_irq_chip_data(irq, NULL);
	}
}

static int tc35892_chip_init(struct tc35892 *tc35892)
{
	int manf, ver, ret;

	manf = tc35892_reg_read(tc35892, TC35892_MANFCODE);
	if (manf < 0)
		return manf;

	ver = tc35892_reg_read(tc35892, TC35892_VERSION);
	if (ver < 0)
		return ver;

	if (manf != TC35892_MANFCODE_MAGIC) {
		dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf);
		return -EINVAL;
	}

	dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver);

	/* Put everything except the IRQ module into reset */
	ret = tc35892_reg_write(tc35892, TC35892_RSTCTRL,
				TC35892_RSTCTRL_TIMRST
				| TC35892_RSTCTRL_ROTRST
				| TC35892_RSTCTRL_KBDRST
				| TC35892_RSTCTRL_GPIRST);
	if (ret < 0)
		return ret;

	/* Clear the reset interrupt. */
	return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1);
}

static int __devinit tc35892_probe(struct i2c_client *i2c,
				   const struct i2c_device_id *id)
{
	struct tc35892_platform_data *pdata = i2c->dev.platform_data;
	struct tc35892 *tc35892;
	int ret;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
				     | I2C_FUNC_SMBUS_I2C_BLOCK))
		return -EIO;

	tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL);
	if (!tc35892)
		return -ENOMEM;

	mutex_init(&tc35892->lock);

	tc35892->dev = &i2c->dev;
	tc35892->i2c = i2c;
	tc35892->pdata = pdata;
	tc35892->irq_base = pdata->irq_base;
	tc35892->num_gpio = id->driver_data;

	i2c_set_clientdata(i2c, tc35892);

	ret = tc35892_chip_init(tc35892);
	if (ret)
		goto out_free;

	ret = tc35892_irq_init(tc35892);
	if (ret)
		goto out_free;

	ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq,
				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				   "tc35892", tc35892);
	if (ret) {
		dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret);
		goto out_removeirq;
	}

	ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs,
			      ARRAY_SIZE(tc35892_devs), NULL,
			      tc35892->irq_base);
	if (ret) {
		dev_err(tc35892->dev, "failed to add children\n");
		goto out_freeirq;
	}

	return 0;

out_freeirq:
	free_irq(tc35892->i2c->irq, tc35892);
out_removeirq:
	tc35892_irq_remove(tc35892);
out_free:
	kfree(tc35892);
	return ret;
}

static int __devexit tc35892_remove(struct i2c_client *client)
{
	struct tc35892 *tc35892 = i2c_get_clientdata(client);

	mfd_remove_devices(tc35892->dev);

	free_irq(tc35892->i2c->irq, tc35892);
	tc35892_irq_remove(tc35892);

	kfree(tc35892);

	return 0;
}

static const struct i2c_device_id tc35892_id[] = {
	{ "tc35892", 24 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tc35892_id);

static struct i2c_driver tc35892_driver = {
	.driver.name	= "tc35892",
	.driver.owner	= THIS_MODULE,
	.probe		= tc35892_probe,
	.remove		= __devexit_p(tc35892_remove),
	.id_table	= tc35892_id,
};

static int __init tc35892_init(void)
{
	return i2c_add_driver(&tc35892_driver);
}
subsys_initcall(tc35892_init);

static void __exit tc35892_exit(void)
{
	i2c_del_driver(&tc35892_driver);
}
module_exit(tc35892_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TC35892 MFD core driver");
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
Commit	Line	Data
b4ecd326 RV	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	*
	4	* License Terms: GNU General Public License, version 2
	5	* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
	6	* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/irq.h>
	12	#include <linux/slab.h>
	13	#include <linux/i2c.h>
	14	#include <linux/mfd/core.h>
	15	#include <linux/mfd/tc35892.h>
	16
	17	/**
	18	* tc35892_reg_read() - read a single TC35892 register
	19	* @tc35892: Device to read from
	20	* @reg: Register to read
	21	*/
	22	int tc35892_reg_read(struct tc35892 *tc35892, u8 reg)
	23	{
	24	int ret;
	25
	26	ret = i2c_smbus_read_byte_data(tc35892->i2c, reg);
	27	if (ret < 0)
	28	dev_err(tc35892->dev, "failed to read reg %#x: %d\n",
	29	reg, ret);
	30
	31	return ret;
	32	}
	33	EXPORT_SYMBOL_GPL(tc35892_reg_read);
	34
	35	/**
	36	* tc35892_reg_read() - write a single TC35892 register
	37	* @tc35892: Device to write to
	38	* @reg: Register to read
	39	* @data: Value to write
	40	*/
	41	int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data)
	42	{
	43	int ret;
	44
	45	ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data);
	46	if (ret < 0)
	47	dev_err(tc35892->dev, "failed to write reg %#x: %d\n",
	48	reg, ret);
	49
	50	return ret;
	51	}
	52	EXPORT_SYMBOL_GPL(tc35892_reg_write);
	53
	54	/**
	55	* tc35892_block_read() - read multiple TC35892 registers
	56	* @tc35892: Device to read from
	57	* @reg: First register
	58	* @length: Number of registers
	59	* @values: Buffer to write to
	60	*/
	61	int tc35892_block_read(struct tc35892 tc35892, u8 reg, u8 length, u8 values)
	62	{
	63	int ret;
	64
65	ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values);
66	if (ret < 0)
67	dev_err(tc35892->dev, "failed to read regs %#x: %d\n",
68	reg, ret);
69
70	return ret;
71	}
72	EXPORT_SYMBOL_GPL(tc35892_block_read);
73
74	/**
75	* tc35892_block_write() - write multiple TC35892 registers
76	* @tc35892: Device to write to
77	* @reg: First register
78	* @length: Number of registers
79	* @values: Values to write
80	*/
81	int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,
82	const u8 *values)
83	{
84	int ret;
85
86	ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length,
87	values);
88	if (ret < 0)
89	dev_err(tc35892->dev, "failed to write regs %#x: %d\n",
90	reg, ret);
91
92	return ret;
93	}
94	EXPORT_SYMBOL_GPL(tc35892_block_write);
95
96	/**
97	* tc35892_set_bits() - set the value of a bitfield in a TC35892 register
98	* @tc35892: Device to write to
99	* @reg: Register to write
100	* @mask: Mask of bits to set
101	* @values: Value to set
102	*/
103	int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val)
104	{
105	int ret;
106
107	mutex_lock(&tc35892->lock);
108
109	ret = tc35892_reg_read(tc35892, reg);
110	if (ret < 0)
111	goto out;
112
113	ret &= ~mask;
114	ret \|= val;
115
116	ret = tc35892_reg_write(tc35892, reg, ret);
117
118	out:
119	mutex_unlock(&tc35892->lock);
120	return ret;
121	}
122	EXPORT_SYMBOL_GPL(tc35892_set_bits);
123
124	static struct resource gpio_resources[] = {
125	{
126	.start = TC35892_INT_GPIIRQ,
127	.end = TC35892_INT_GPIIRQ,
128	.flags = IORESOURCE_IRQ,
129	},
130	};
131
132	static struct mfd_cell tc35892_devs[] = {
133	{
134	.name = "tc35892-gpio",
135	.num_resources = ARRAY_SIZE(gpio_resources),
136	.resources = &gpio_resources[0],
137	},
138	};
139
140	static irqreturn_t tc35892_irq(int irq, void *data)
141	{
142	struct tc35892 *tc35892 = data;
143	int status;
144
145	status = tc35892_reg_read(tc35892, TC35892_IRQST);
146	if (status < 0)
147	return IRQ_NONE;
148
149	while (status) {
150	int bit = __ffs(status);
151
152	handle_nested_irq(tc35892->irq_base + bit);
153	status &= ~(1 << bit);
154	}
155
156	/*
157	* A dummy read or write (to any register) appears to be necessary to
158	* have the last interrupt clear (for example, GPIO IC write) take
159	* effect.
160	*/
161	tc35892_reg_read(tc35892, TC35892_IRQST);
162
163	return IRQ_HANDLED;
164	}
165
166	static void tc35892_irq_dummy(unsigned int irq)
167	{
168	/* No mask/unmask at this level */
169	}
170
171	static struct irq_chip tc35892_irq_chip = {
172	.name = "tc35892",
173	.mask = tc35892_irq_dummy,
174	.unmask = tc35892_irq_dummy,
175	};
176
177	static int tc35892_irq_init(struct tc35892 *tc35892)
178	{
179	int base = tc35892->irq_base;
180	int irq;
181
182	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
183	set_irq_chip_data(irq, tc35892);
184	set_irq_chip_and_handler(irq, &tc35892_irq_chip,
185	handle_edge_irq);
186	set_irq_nested_thread(irq, 1);
187	#ifdef CONFIG_ARM
188	set_irq_flags(irq, IRQF_VALID);
189	#else
190	set_irq_noprobe(irq);
191	#endif
192	}
193
194	return 0;
195	}
196
197	static void tc35892_irq_remove(struct tc35892 *tc35892)
198	{
199	int base = tc35892->irq_base;
200	int irq;
201
202	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
203	#ifdef CONFIG_ARM
204	set_irq_flags(irq, 0);
205	#endif
206	set_irq_chip_and_handler(irq, NULL, NULL);
207	set_irq_chip_data(irq, NULL);
208	}
209	}
210
211	static int tc35892_chip_init(struct tc35892 *tc35892)
212	{
213	int manf, ver, ret;
214
215	manf = tc35892_reg_read(tc35892, TC35892_MANFCODE);
216	if (manf < 0)
217	return manf;
218
219	ver = tc35892_reg_read(tc35892, TC35892_VERSION);
220	if (ver < 0)
221	return ver;
222
223	if (manf != TC35892_MANFCODE_MAGIC) {
224	dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf);
225	return -EINVAL;
226	}
227
228	dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
229
230	/* Put everything except the IRQ module into reset */
231	ret = tc35892_reg_write(tc35892, TC35892_RSTCTRL,
232	TC35892_RSTCTRL_TIMRST
233	\| TC35892_RSTCTRL_ROTRST
234	\| TC35892_RSTCTRL_KBDRST
235	\| TC35892_RSTCTRL_GPIRST);
236	if (ret < 0)
237	return ret;
238
239	/* Clear the reset interrupt. */
240	return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1);
241	}
242
243	static int __devinit tc35892_probe(struct i2c_client *i2c,
244	const struct i2c_device_id *id)
245	{
246	struct tc35892_platform_data *pdata = i2c->dev.platform_data;
247	struct tc35892 *tc35892;
248	int ret;
249
250	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
251	\| I2C_FUNC_SMBUS_I2C_BLOCK))
252	return -EIO;
253
254	tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL);
255	if (!tc35892)
256	return -ENOMEM;
257
258	mutex_init(&tc35892->lock);
259
260	tc35892->dev = &i2c->dev;
261	tc35892->i2c = i2c;
262	tc35892->pdata = pdata;
263	tc35892->irq_base = pdata->irq_base;
264	tc35892->num_gpio = id->driver_data;
265
266	i2c_set_clientdata(i2c, tc35892);
267
268	ret = tc35892_chip_init(tc35892);
269	if (ret)
270	goto out_free;
271
272	ret = tc35892_irq_init(tc35892);
273	if (ret)
274	goto out_free;
275
276	ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq,
277	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
278	"tc35892", tc35892);
279	if (ret) {
280	dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret);
281	goto out_removeirq;
282	}
283
284	ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs,
285	ARRAY_SIZE(tc35892_devs), NULL,
286	tc35892->irq_base);
287	if (ret) {
288	dev_err(tc35892->dev, "failed to add children\n");
289	goto out_freeirq;
290	}
291
292	return 0;
293
294	out_freeirq:
295	free_irq(tc35892->i2c->irq, tc35892);
296	out_removeirq:
297	tc35892_irq_remove(tc35892);
298	out_free:
b4ecd326 RV	299	kfree(tc35892);
	300	return ret;
	301	}
	302
	303	static int __devexit tc35892_remove(struct i2c_client *client)
	304	{
	305	struct tc35892 *tc35892 = i2c_get_clientdata(client);
	306
	307	mfd_remove_devices(tc35892->dev);
	308
	309	free_irq(tc35892->i2c->irq, tc35892);
	310	tc35892_irq_remove(tc35892);
	311
b4ecd326 RV	312	kfree(tc35892);
	313
	314	return 0;
	315	}
	316
	317	static const struct i2c_device_id tc35892_id[] = {
	318	{ "tc35892", 24 },
	319	{ }
	320	};
	321	MODULE_DEVICE_TABLE(i2c, tc35892_id);
	322
	323	static struct i2c_driver tc35892_driver = {
	324	.driver.name = "tc35892",
	325	.driver.owner = THIS_MODULE,
	326	.probe = tc35892_probe,
	327	.remove = __devexit_p(tc35892_remove),
	328	.id_table = tc35892_id,
	329	};
	330
	331	static int __init tc35892_init(void)
	332	{
	333	return i2c_add_driver(&tc35892_driver);
	334	}
	335	subsys_initcall(tc35892_init);
	336
	337	static void __exit tc35892_exit(void)
	338	{
	339	i2c_del_driver(&tc35892_driver);
	340	}
	341	module_exit(tc35892_exit);
	342
	343	MODULE_LICENSE("GPL v2");
	344	MODULE_DESCRIPTION("TC35892 MFD core driver");
	345	MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");