[mirror_ubuntu-zesty-kernel.git] / drivers / i2c / chips / atxp1.c

/*
    atxp1.c - kernel module for setting CPU VID and general purpose
                     I/Os using the Attansic ATXP1 chip.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-sensor.h>
#include <linux/i2c-vid.h>

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
MODULE_VERSION("0.6.2");
MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");

#define ATXP1_VID	0x00
#define ATXP1_CVID	0x01
#define ATXP1_GPIO1	0x06
#define ATXP1_GPIO2	0x0a
#define ATXP1_VIDENA	0x20
#define ATXP1_VIDMASK	0x1f
#define ATXP1_GPIO1MASK	0x0f

static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };

SENSORS_INSMOD_1(atxp1);

static int atxp1_attach_adapter(struct i2c_adapter * adapter);
static int atxp1_detach_client(struct i2c_client * client);
static struct atxp1_data * atxp1_update_device(struct device *dev);
static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);

static struct i2c_driver atxp1_driver = {
	.owner		= THIS_MODULE,
	.name		= "atxp1",
	.flags		= I2C_DF_NOTIFY,
	.attach_adapter = atxp1_attach_adapter,
	.detach_client	= atxp1_detach_client,
};

struct atxp1_data {
	struct i2c_client client;
	struct semaphore update_lock;
	unsigned long last_updated;
	u8 valid;
	struct {
		u8 vid;		/* VID output register */
		u8 cpu_vid; /* VID input from CPU */
		u8 gpio1;   /* General purpose I/O register 1 */
		u8 gpio2;   /* General purpose I/O register 2 */
	} reg;
	u8 vrm;			/* Detected CPU VRM */
};

static struct atxp1_data * atxp1_update_device(struct device *dev)
{
	struct i2c_client *client;
	struct atxp1_data *data;

	client = to_i2c_client(dev);
	data = i2c_get_clientdata(client);

	down(&data->update_lock);

	if ((jiffies - data->last_updated > HZ) ||
	    (jiffies < data->last_updated) ||
	    !data->valid) {

		/* Update local register data */
		data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
		data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
		data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
		data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);

		data->valid = 1;
	}

	up(&data->update_lock);

	return(data);
}

/* sys file functions for cpu0_vid */
ssize_t atxp1_showvcore(struct device *dev, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));

	return size;
}

ssize_t atxp1_storevcore(struct device *dev, const char* buf, size_t count)
{
	struct atxp1_data *data;
	struct i2c_client *client;
	char vid;
	char cvid;
	unsigned int vcore;

	client = to_i2c_client(dev);
	data = atxp1_update_device(dev);

	vcore = simple_strtoul(buf, NULL, 10);
	vcore /= 25;
	vcore *= 25;

	/* Calculate VID */
	vid = vid_to_reg(vcore, data->vrm);

	if (vid < 0) {
		dev_err(dev, "VID calculation failed.\n");
		return -1;
	}

	/* If output enabled, use control register value. Otherwise original CPU VID */
	if (data->reg.vid & ATXP1_VIDENA)
		cvid = data->reg.vid & ATXP1_VIDMASK;
	else
		cvid = data->reg.cpu_vid;

	/* Nothing changed, aborting */
	if (vid == cvid)
		return count;

	dev_info(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);

	/* Write every 25 mV step to increase stability */
	if (cvid > vid) {
		for (; cvid >= vid; cvid--) {
        		i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
		}
	}
	else {
		for (; cvid <= vid; cvid++) {
        		i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
		}
	}

	data->valid = 0;

	return count;
}

/* CPU core reference voltage
    unit: millivolt
*/
static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);

/* sys file functions for GPIO1 */
ssize_t atxp1_showgpio1(struct device *dev, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);

	return size;
}

ssize_t atxp1_storegpio1(struct device *dev, const char* buf, size_t count)
{
	struct atxp1_data *data;
	struct i2c_client *client;
	unsigned int value;

	client = to_i2c_client(dev);
	data = atxp1_update_device(dev);

	value = simple_strtoul(buf, NULL, 16);

	value &= ATXP1_GPIO1MASK;

	if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
		dev_info(dev, "Writing 0x%x to GPIO1.\n", value);

		i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);

		data->valid = 0;
	}

	return count;
}

/* GPIO1 data register
    unit: Four bit as hex (e.g. 0x0f)
*/
static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);

/* sys file functions for GPIO2 */
ssize_t atxp1_showgpio2(struct device *dev, char *buf)
{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);

	return size;
}

ssize_t atxp1_storegpio2(struct device *dev, const char* buf, size_t count)
{
	struct atxp1_data *data;
	struct i2c_client *client;
	unsigned int value;

	client = to_i2c_client(dev);
	data = atxp1_update_device(dev);

	value = simple_strtoul(buf, NULL, 16) & 0xff;

	if (value != data->reg.gpio2) {
		dev_info(dev, "Writing 0x%x to GPIO1.\n", value);

		i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);

		data->valid = 0;
	}

	return count;
}

/* GPIO2 data register
    unit: Eight bit as hex (e.g. 0xff)
*/
static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);


static int atxp1_attach_adapter(struct i2c_adapter *adapter)
{
	return i2c_detect(adapter, &addr_data, &atxp1_detect);
};

static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client * new_client;
	struct atxp1_data * data;
	int err = 0;
	u8 temp;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

	if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	memset(data, 0, sizeof(struct atxp1_data));
	new_client = &data->client;
	i2c_set_clientdata(new_client, data);

	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &atxp1_driver;
	new_client->flags = 0;

	/* Detect ATXP1, checking if vendor ID registers are all zero */
	if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
	     (i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {

		/* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
		 * showing the same as register 0x00 */
		temp = i2c_smbus_read_byte_data(new_client, 0x00);

		if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
			 (i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
			goto exit_free;
	}

	/* Get VRM */
	data->vrm = i2c_which_vrm();

	if ((data->vrm != 90) && (data->vrm != 91)) {
		dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
				data->vrm / 10, data->vrm % 10);
		goto exit_free;
	}

	strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);

	data->valid = 0;

	init_MUTEX(&data->update_lock);

	err = i2c_attach_client(new_client);

	if (err)
	{
		dev_err(&new_client->dev, "Attach client error.\n");
		goto exit_free;
	}

	device_create_file(&new_client->dev, &dev_attr_gpio1);
	device_create_file(&new_client->dev, &dev_attr_gpio2);
	device_create_file(&new_client->dev, &dev_attr_cpu0_vid);

	dev_info(&new_client->dev, "Using VRM: %d.%d\n",
			 data->vrm / 10, data->vrm % 10);

	return 0;

exit_free:
	kfree(data);
exit:
	return err;
};

static int atxp1_detach_client(struct i2c_client * client)
{
	int err;

	err = i2c_detach_client(client);

	if (err)
		dev_err(&client->dev, "Failed to detach client.\n");
	else
		kfree(i2c_get_clientdata(client));

	return err;
};

static int __init atxp1_init(void)
{
	return i2c_add_driver(&atxp1_driver);
};

static void __exit atxp1_exit(void)
{
	i2c_del_driver(&atxp1_driver);
};

module_init(atxp1_init);
module_exit(atxp1_exit);
Commit	Line	Data
9cb7d184 SW	1	/*
	2	atxp1.c - kernel module for setting CPU VID and general purpose
	3	I/Os using the Attansic ATXP1 chip.
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; if not, write to the Free Software
	17	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/i2c.h>
	25	#include <linux/i2c-sensor.h>
	26	#include <linux/i2c-vid.h>
	27
	28	MODULE_LICENSE("GPL");
	29	MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
	30	MODULE_VERSION("0.6.2");
	31	MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
	32
	33	#define ATXP1_VID 0x00
	34	#define ATXP1_CVID 0x01
	35	#define ATXP1_GPIO1 0x06
	36	#define ATXP1_GPIO2 0x0a
	37	#define ATXP1_VIDENA 0x20
	38	#define ATXP1_VIDMASK 0x1f
	39	#define ATXP1_GPIO1MASK 0x0f
	40
	41	static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
	42	static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
	43
	44	SENSORS_INSMOD_1(atxp1);
	45
	46	static int atxp1_attach_adapter(struct i2c_adapter * adapter);
	47	static int atxp1_detach_client(struct i2c_client * client);
	48	static struct atxp1_data * atxp1_update_device(struct device *dev);
	49	static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);
	50
	51	static struct i2c_driver atxp1_driver = {
	52	.owner = THIS_MODULE,
	53	.name = "atxp1",
	54	.flags = I2C_DF_NOTIFY,
	55	.attach_adapter = atxp1_attach_adapter,
	56	.detach_client = atxp1_detach_client,
	57	};
	58
	59	struct atxp1_data {
	60	struct i2c_client client;
	61	struct semaphore update_lock;
	62	unsigned long last_updated;
	63	u8 valid;
	64	struct {
65	u8 vid; /* VID output register */
66	u8 cpu_vid; /* VID input from CPU */
67	u8 gpio1; /* General purpose I/O register 1 */
68	u8 gpio2; /* General purpose I/O register 2 */
69	} reg;
70	u8 vrm; /* Detected CPU VRM */
71	};
72
73	static struct atxp1_data * atxp1_update_device(struct device *dev)
74	{
75	struct i2c_client *client;
76	struct atxp1_data *data;
77
78	client = to_i2c_client(dev);
79	data = i2c_get_clientdata(client);
80
81	down(&data->update_lock);
82
83	if ((jiffies - data->last_updated > HZ) \|\|
84	(jiffies < data->last_updated) \|\|
85	!data->valid) {
86
87	/* Update local register data */
88	data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
89	data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
90	data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
91	data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
92
93	data->valid = 1;
94	}
95
96	up(&data->update_lock);
97
98	return(data);
99	}
100
101	/* sys file functions for cpu0_vid */
102	ssize_t atxp1_showvcore(struct device dev, char buf)
103	{
104	int size;
105	struct atxp1_data *data;
106
107	data = atxp1_update_device(dev);
108
109	size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
110
111	return size;
112	}
113
114	ssize_t atxp1_storevcore(struct device dev, const char buf, size_t count)
115	{
116	struct atxp1_data *data;
117	struct i2c_client *client;
118	char vid;
119	char cvid;
120	unsigned int vcore;
121
122	client = to_i2c_client(dev);
123	data = atxp1_update_device(dev);
124
125	vcore = simple_strtoul(buf, NULL, 10);
126	vcore /= 25;
127	vcore *= 25;
128
129	/* Calculate VID */
130	vid = vid_to_reg(vcore, data->vrm);
131
132	if (vid < 0) {
133	dev_err(dev, "VID calculation failed.\n");
134	return -1;
135	}
136
137	/* If output enabled, use control register value. Otherwise original CPU VID */
138	if (data->reg.vid & ATXP1_VIDENA)
139	cvid = data->reg.vid & ATXP1_VIDMASK;
140	else
141	cvid = data->reg.cpu_vid;
142
143	/* Nothing changed, aborting */
144	if (vid == cvid)
145	return count;
146
147	dev_info(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
148
149	/* Write every 25 mV step to increase stability */
150	if (cvid > vid) {
151	for (; cvid >= vid; cvid--) {
152	i2c_smbus_write_byte_data(client, ATXP1_VID, cvid \| ATXP1_VIDENA);
153	}
154	}
155	else {
156	for (; cvid <= vid; cvid++) {
157	i2c_smbus_write_byte_data(client, ATXP1_VID, cvid \| ATXP1_VIDENA);
158	}
159	}
160
161	data->valid = 0;
162
163	return count;
164	}
165
166	/* CPU core reference voltage
167	unit: millivolt
168	*/
169	static DEVICE_ATTR(cpu0_vid, S_IRUGO \| S_IWUSR, atxp1_showvcore, atxp1_storevcore);
170
171	/* sys file functions for GPIO1 */
172	ssize_t atxp1_showgpio1(struct device dev, char buf)
173	{
174	int size;
175	struct atxp1_data *data;
176
177	data = atxp1_update_device(dev);
178
179	size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
180
181	return size;
182	}
183
184	ssize_t atxp1_storegpio1(struct device dev, const char buf, size_t count)
185	{
186	struct atxp1_data *data;
187	struct i2c_client *client;
188	unsigned int value;
189
190	client = to_i2c_client(dev);
191	data = atxp1_update_device(dev);
192
193	value = simple_strtoul(buf, NULL, 16);
194
195	value &= ATXP1_GPIO1MASK;
196
197	if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
198	dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
199
200	i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
201
202	data->valid = 0;
203	}
204
205	return count;
206	}
207
208	/* GPIO1 data register
209	unit: Four bit as hex (e.g. 0x0f)
210	*/
211	static DEVICE_ATTR(gpio1, S_IRUGO \| S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
212
213	/* sys file functions for GPIO2 */
214	ssize_t atxp1_showgpio2(struct device dev, char buf)
215	{
216	int size;
217	struct atxp1_data *data;
218
219	data = atxp1_update_device(dev);
220
221	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
222
223	return size;
224	}
225
226	ssize_t atxp1_storegpio2(struct device dev, const char buf, size_t count)
227	{
228	struct atxp1_data *data;
229	struct i2c_client *client;
230	unsigned int value;
231
232	client = to_i2c_client(dev);
233	data = atxp1_update_device(dev);
234
235	value = simple_strtoul(buf, NULL, 16) & 0xff;
236
237	if (value != data->reg.gpio2) {
238	dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
239
240	i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
241
242	data->valid = 0;
243	}
244
245	return count;
246	}
247
248	/* GPIO2 data register
249	unit: Eight bit as hex (e.g. 0xff)
250	*/
251	static DEVICE_ATTR(gpio2, S_IRUGO \| S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
252
253
254	static int atxp1_attach_adapter(struct i2c_adapter *adapter)
255	{
256	return i2c_detect(adapter, &addr_data, &atxp1_detect);
257	};
258
259	static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
260	{
261	struct i2c_client * new_client;
262	struct atxp1_data * data;
263	int err = 0;
264	u8 temp;
265
266	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
267	goto exit;
268
269	if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
270	err = -ENOMEM;
271	goto exit;
272	}
273
274	memset(data, 0, sizeof(struct atxp1_data));
275	new_client = &data->client;
276	i2c_set_clientdata(new_client, data);
277
278	new_client->addr = address;
279	new_client->adapter = adapter;
280	new_client->driver = &atxp1_driver;
281	new_client->flags = 0;
282
283	/* Detect ATXP1, checking if vendor ID registers are all zero */
284	if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
285	(i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
286	(i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
287	(i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {
288
289	/* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
290	* showing the same as register 0x00 */
291	temp = i2c_smbus_read_byte_data(new_client, 0x00);
292
293	if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
294	(i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
295	goto exit_free;
296	}
297
298	/* Get VRM */
299	data->vrm = i2c_which_vrm();
300
301	if ((data->vrm != 90) && (data->vrm != 91)) {
302	dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
303	data->vrm / 10, data->vrm % 10);
304	goto exit_free;
305	}
306
307	strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);
308
309	data->valid = 0;
310
311	init_MUTEX(&data->update_lock);
312
313	err = i2c_attach_client(new_client);
314
315	if (err)
316	{
317	dev_err(&new_client->dev, "Attach client error.\n");
318	goto exit_free;
319	}
320
321	device_create_file(&new_client->dev, &dev_attr_gpio1);
322	device_create_file(&new_client->dev, &dev_attr_gpio2);
323	device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
324
325	dev_info(&new_client->dev, "Using VRM: %d.%d\n",
326	data->vrm / 10, data->vrm % 10);
327
328	return 0;
329
330	exit_free:
331	kfree(data);
332	exit:
333	return err;
334	};
335
336	static int atxp1_detach_client(struct i2c_client * client)
337	{
338	int err;
339
340	err = i2c_detach_client(client);
341
342	if (err)
343	dev_err(&client->dev, "Failed to detach client.\n");
344	else
345	kfree(i2c_get_clientdata(client));
346
347	return err;
348	};
349
350	static int __init atxp1_init(void)
351	{
352	return i2c_add_driver(&atxp1_driver);
353	};
354
355	static void __exit atxp1_exit(void)
356	{
357	i2c_del_driver(&atxp1_driver);
358	};
359
360	module_init(atxp1_init);
361	module_exit(atxp1_exit);