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v6.13.7
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
  4 *             monitoring
  5 * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
  6 *                         Jean Delvare <jdelvare@suse.de>
  7 *
  8 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
  9 * It reports up to two temperatures (its own plus up to
 10 * one external one). Complete datasheet can be
 11 * obtained from Maxim's website at:
 12 *   http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 13 */
 14
 15#include <linux/err.h>
 16#include <linux/hwmon.h>
 17#include <linux/i2c.h>
 18#include <linux/init.h>
 19#include <linux/module.h>
 20#include <linux/regmap.h>
 21#include <linux/util_macros.h>
 
 
 
 
 
 
 
 22
 23static const unsigned short normal_i2c[] = {
 24	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 25
 26#define MAX1619_REG_LOCAL_TEMP		0x00
 27#define MAX1619_REG_REMOTE_TEMP		0x01
 28#define MAX1619_REG_STATUS		0x02
 29#define MAX1619_REG_CONFIG		0x03
 30#define MAX1619_REG_CONVRATE		0x04
 31#define MAX1619_REG_REMOTE_HIGH		0x07
 32#define MAX1619_REG_REMOTE_LOW		0x08
 33#define MAX1619_REG_REMOTE_CRIT		0x10
 34#define MAX1619_REG_REMOTE_CRIT_HYST	0x11
 35#define MAX1619_REG_MAN_ID		0xFE
 36#define MAX1619_REG_CHIP_ID		0xFF
 37
 38static int get_alarms(struct regmap *regmap)
 39{
 40	static u32 regs[2] = { MAX1619_REG_STATUS, MAX1619_REG_CONFIG };
 41	u8 regdata[2];
 42	int ret;
 43
 44	ret = regmap_multi_reg_read(regmap, regs, regdata, 2);
 45	if (ret)
 46		return ret;
 47
 48	/* OVERT status bit may be reversed */
 49	if (!(regdata[1] & 0x20))
 50		regdata[0] ^= 0x02;
 51
 52	return regdata[0] & 0x1e;
 53}
 54
 55static int max1619_temp_read(struct regmap *regmap, u32 attr, int channel, long *val)
 56{
 57	int reg = -1, alarm_bit = 0;
 58	u32 temp;
 59	int ret;
 60
 61	switch (attr) {
 62	case hwmon_temp_input:
 63		reg = channel ? MAX1619_REG_REMOTE_TEMP : MAX1619_REG_LOCAL_TEMP;
 64		break;
 65	case hwmon_temp_min:
 66		reg = MAX1619_REG_REMOTE_LOW;
 67		break;
 68	case hwmon_temp_max:
 69		reg = MAX1619_REG_REMOTE_HIGH;
 70		break;
 71	case hwmon_temp_crit:
 72		reg = MAX1619_REG_REMOTE_CRIT;
 73		break;
 74	case hwmon_temp_crit_hyst:
 75		reg = MAX1619_REG_REMOTE_CRIT_HYST;
 76		break;
 77	case hwmon_temp_min_alarm:
 78		alarm_bit = 3;
 79		break;
 80	case hwmon_temp_max_alarm:
 81		alarm_bit = 4;
 82		break;
 83	case hwmon_temp_crit_alarm:
 84		alarm_bit = 1;
 85		break;
 86	case hwmon_temp_fault:
 87		alarm_bit = 2;
 88		break;
 89	default:
 90		return -EOPNOTSUPP;
 91	}
 92	if (reg >= 0) {
 93		ret = regmap_read(regmap, reg, &temp);
 94		if (ret < 0)
 95			return ret;
 96		*val = sign_extend32(temp, 7) * 1000;
 97	} else {
 98		ret = get_alarms(regmap);
 99		if (ret < 0)
100			return ret;
101		*val = !!(ret & BIT(alarm_bit));
102	}
103	return 0;
104}
105
106static u16 update_intervals[] = { 16000, 8000, 4000, 2000, 1000, 500, 250, 125 };
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
107
108static int max1619_chip_read(struct regmap *regmap, u32 attr, long *val)
109{
110	int alarms, ret;
111	u32 regval;
112
113	switch (attr) {
114	case hwmon_chip_update_interval:
115		ret = regmap_read(regmap, MAX1619_REG_CONVRATE, &regval);
116		if (ret < 0)
117			return ret;
118		*val = update_intervals[regval & 7];
119		break;
120	case hwmon_chip_alarms:
121		alarms = get_alarms(regmap);
122		if (alarms < 0)
123			return alarms;
124		*val = alarms;
125		break;
126	default:
127		return -EOPNOTSUPP;
128	}
129	return 0;
130}
131
132static int max1619_read(struct device *dev, enum hwmon_sensor_types type,
133			u32 attr, int channel, long *val)
134{
135	struct regmap *regmap = dev_get_drvdata(dev);
136
137	switch (type) {
138	case hwmon_chip:
139		return max1619_chip_read(regmap, attr, val);
140	case hwmon_temp:
141		return max1619_temp_read(regmap, attr, channel, val);
142	default:
143		return -EOPNOTSUPP;
144	}
145}
146
147static int max1619_chip_write(struct regmap *regmap, u32 attr, long val)
148{
149	switch (attr) {
150	case hwmon_chip_update_interval:
151		val = find_closest_descending(val, update_intervals, ARRAY_SIZE(update_intervals));
152		return regmap_write(regmap, MAX1619_REG_CONVRATE, val);
153	default:
154		return -EOPNOTSUPP;
155	}
156}
157
158static int max1619_temp_write(struct regmap *regmap,
159			      u32 attr, int channel, long val)
160{
161	int reg;
162
163	switch (attr) {
164	case hwmon_temp_min:
165		reg = MAX1619_REG_REMOTE_LOW;
166		break;
167	case hwmon_temp_max:
168		reg = MAX1619_REG_REMOTE_HIGH;
169		break;
170	case hwmon_temp_crit:
171		reg = MAX1619_REG_REMOTE_CRIT;
172		break;
173	case hwmon_temp_crit_hyst:
174		reg = MAX1619_REG_REMOTE_CRIT_HYST;
175		break;
176	default:
177		return -EOPNOTSUPP;
178	}
179	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
180	return regmap_write(regmap, reg, val);
181}
182
183static int max1619_write(struct device *dev, enum hwmon_sensor_types type,
184			 u32 attr, int channel, long val)
185{
186	struct regmap *regmap = dev_get_drvdata(dev);
187
188	switch (type) {
189	case hwmon_chip:
190		return max1619_chip_write(regmap, attr, val);
191	case hwmon_temp:
192		return max1619_temp_write(regmap, attr, channel, val);
193	default:
194		return -EOPNOTSUPP;
195	}
196}
197
198static umode_t max1619_is_visible(const void *_data, enum hwmon_sensor_types type,
199				  u32 attr, int channel)
200{
201	switch (type) {
202	case hwmon_chip:
203		switch (attr) {
204		case hwmon_chip_update_interval:
205			return 0644;
206		case hwmon_chip_alarms:
207			return 0444;
208		default:
209			break;
210		}
211		break;
212	case hwmon_temp:
213		switch (attr) {
214		case hwmon_temp_input:
215			return 0444;
216		case hwmon_temp_min:
217		case hwmon_temp_max:
218		case hwmon_temp_crit:
219		case hwmon_temp_crit_hyst:
220			return 0644;
221		case hwmon_temp_min_alarm:
222		case hwmon_temp_max_alarm:
223		case hwmon_temp_crit_alarm:
224		case hwmon_temp_fault:
225			return 0444;
226		default:
227			break;
228		}
229		break;
230	default:
231		break;
232	}
233	return 0;
234}
235
236static const struct hwmon_channel_info * const max1619_info[] = {
237	HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS | HWMON_C_UPDATE_INTERVAL),
238	HWMON_CHANNEL_INFO(temp,
239			   HWMON_T_INPUT,
240			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
241			   HWMON_T_CRIT | HWMON_T_CRIT_HYST |
242			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
243			   HWMON_T_CRIT_ALARM | HWMON_T_FAULT),
244	NULL
 
 
 
 
 
 
 
245};
246
247static const struct hwmon_ops max1619_hwmon_ops = {
248	.is_visible = max1619_is_visible,
249	.read = max1619_read,
250	.write = max1619_write,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
251};
252
253static const struct hwmon_chip_info max1619_chip_info = {
254	.ops = &max1619_hwmon_ops,
255	.info = max1619_info,
256};
257
 
 
 
 
258/* Return 0 if detection is successful, -ENODEV otherwise */
259static int max1619_detect(struct i2c_client *client,
260			  struct i2c_board_info *info)
261{
262	struct i2c_adapter *adapter = client->adapter;
263	int regval;
264
265	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
266		return -ENODEV;
267
268	regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG);
269	if (regval < 0 || (regval & 0x03))
270		return -ENODEV;
271	regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE);
272	if (regval < 0 || regval > 0x07)
273		return -ENODEV;
274	regval = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS);
275	if (regval < 0 || (regval & 0x61))
276		return -ENODEV;
 
277
278	regval = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID);
279	if (regval != 0x4d)
280		return -ENODEV;
281	regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID);
282	if (regval != 0x04)
 
 
283		return -ENODEV;
 
284
285	strscpy(info->type, "max1619", I2C_NAME_SIZE);
286
287	return 0;
288}
289
290static int max1619_init_chip(struct regmap *regmap)
 
291{
292	int ret;
293
294	ret = regmap_write(regmap, MAX1619_REG_CONVRATE, 5);	/* 2 Hz */
295	if (ret)
296		return ret;
297
298	/* Start conversions */
299	return regmap_clear_bits(regmap, MAX1619_REG_CONFIG, 0x40);
300}
301
302/* regmap */
303
304static int max1619_reg_read(void *context, unsigned int reg, unsigned int *val)
305{
306	int ret;
307
308	ret = i2c_smbus_read_byte_data(context, reg);
309	if (ret < 0)
310		return ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
311
312	*val = ret;
313	return 0;
314}
315
316static int max1619_reg_write(void *context, unsigned int reg, unsigned int val)
317{
318	int offset = reg < MAX1619_REG_REMOTE_CRIT ? 6 : 2;
319
320	return i2c_smbus_write_byte_data(context, reg + offset, val);
 
 
 
 
 
321}
322
323static bool max1619_regmap_is_volatile(struct device *dev, unsigned int reg)
324{
325	return reg <= MAX1619_REG_STATUS;
 
 
 
 
 
 
 
 
 
 
326}
327
328static bool max1619_regmap_is_writeable(struct device *dev, unsigned int reg)
329{
330	return reg > MAX1619_REG_STATUS && reg <= MAX1619_REG_REMOTE_CRIT_HYST;
331}
332
333static const struct regmap_config max1619_regmap_config = {
334	.reg_bits = 8,
335	.val_bits = 8,
336	.max_register = MAX1619_REG_REMOTE_CRIT_HYST,
337	.cache_type = REGCACHE_MAPLE,
338	.volatile_reg = max1619_regmap_is_volatile,
339	.writeable_reg = max1619_regmap_is_writeable,
340};
341
342static const struct regmap_bus max1619_regmap_bus = {
343	.reg_write = max1619_reg_write,
344	.reg_read = max1619_reg_read,
345};
346
347static int max1619_probe(struct i2c_client *client)
348{
349	struct device *dev = &client->dev;
350	struct device *hwmon_dev;
351	struct regmap *regmap;
352	int ret;
353
354	regmap = devm_regmap_init(dev, &max1619_regmap_bus, client,
355				  &max1619_regmap_config);
356	if (IS_ERR(regmap))
357		return PTR_ERR(regmap);
358
359	ret = max1619_init_chip(regmap);
360	if (ret)
361		return ret;
362
363	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
364							 regmap, &max1619_chip_info, NULL);
365	return PTR_ERR_OR_ZERO(hwmon_dev);
366}
367
368static const struct i2c_device_id max1619_id[] = {
369	{ "max1619" },
370	{ }
371};
372MODULE_DEVICE_TABLE(i2c, max1619_id);
 
 
 
 
 
 
 
 
 
 
 
373
374#ifdef CONFIG_OF
375static const struct of_device_id max1619_of_match[] = {
376	{ .compatible = "maxim,max1619", },
377	{},
378};
379
380MODULE_DEVICE_TABLE(of, max1619_of_match);
381#endif
382
383static struct i2c_driver max1619_driver = {
384	.class		= I2C_CLASS_HWMON,
385	.driver = {
386		.name	= "max1619",
387		.of_match_table = of_match_ptr(max1619_of_match),
388	},
389	.probe		= max1619_probe,
390	.id_table	= max1619_id,
391	.detect		= max1619_detect,
392	.address_list	= normal_i2c,
393};
394
395module_i2c_driver(max1619_driver);
 
 
 
396
397MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
 
 
 
 
 
 
398MODULE_DESCRIPTION("MAX1619 sensor driver");
399MODULE_LICENSE("GPL");
v3.1
 
  1/*
  2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
  3 *             monitoring
  4 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
  5 *                         Jean Delvare <khali@linux-fr.org>
  6 *
  7 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
  8 * It reports up to two temperatures (its own plus up to
  9 * one external one). Complete datasheet can be
 10 * obtained from Maxim's website at:
 11 *   http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
 12 *
 13 * This program is free software; you can redistribute it and/or modify
 14 * it under the terms of the GNU General Public License as published by
 15 * the Free Software Foundation; either version 2 of the License, or
 16 * (at your option) any later version.
 17 *
 18 * This program is distributed in the hope that it will be useful,
 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21 * GNU General Public License for more details.
 22 *
 23 * You should have received a copy of the GNU General Public License
 24 * along with this program; if not, write to the Free Software
 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 26 */
 27
 28
 
 
 
 29#include <linux/module.h>
 30#include <linux/init.h>
 31#include <linux/slab.h>
 32#include <linux/jiffies.h>
 33#include <linux/i2c.h>
 34#include <linux/hwmon.h>
 35#include <linux/hwmon-sysfs.h>
 36#include <linux/err.h>
 37#include <linux/mutex.h>
 38#include <linux/sysfs.h>
 39
 40static const unsigned short normal_i2c[] = {
 41	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 42
 43/*
 44 * The MAX1619 registers
 45 */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 46
 47#define MAX1619_REG_R_MAN_ID		0xFE
 48#define MAX1619_REG_R_CHIP_ID		0xFF
 49#define MAX1619_REG_R_CONFIG		0x03
 50#define MAX1619_REG_W_CONFIG		0x09
 51#define MAX1619_REG_R_CONVRATE		0x04
 52#define MAX1619_REG_W_CONVRATE		0x0A
 53#define MAX1619_REG_R_STATUS		0x02
 54#define MAX1619_REG_R_LOCAL_TEMP	0x00
 55#define MAX1619_REG_R_REMOTE_TEMP	0x01
 56#define MAX1619_REG_R_REMOTE_HIGH	0x07
 57#define MAX1619_REG_W_REMOTE_HIGH	0x0D
 58#define MAX1619_REG_R_REMOTE_LOW	0x08
 59#define MAX1619_REG_W_REMOTE_LOW	0x0E
 60#define MAX1619_REG_R_REMOTE_CRIT	0x10
 61#define MAX1619_REG_W_REMOTE_CRIT	0x12
 62#define MAX1619_REG_R_TCRIT_HYST	0x11
 63#define MAX1619_REG_W_TCRIT_HYST	0x13
 64
 65/*
 66 * Conversions
 67 */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 68
 69static int temp_from_reg(int val)
 
 70{
 71	return (val & 0x80 ? val-0x100 : val) * 1000;
 
 
 
 
 
 
 
 
 
 72}
 73
 74static int temp_to_reg(int val)
 75{
 76	return (val < 0 ? val+0x100*1000 : val) / 1000;
 
 
 
 
 
 
 77}
 78
 79/*
 80 * Functions declaration
 81 */
 
 82
 83static int max1619_probe(struct i2c_client *client,
 84			 const struct i2c_device_id *id);
 85static int max1619_detect(struct i2c_client *client,
 86			  struct i2c_board_info *info);
 87static void max1619_init_client(struct i2c_client *client);
 88static int max1619_remove(struct i2c_client *client);
 89static struct max1619_data *max1619_update_device(struct device *dev);
 
 
 
 
 
 
 
 
 
 
 
 
 90
 91/*
 92 * Driver data (common to all clients)
 93 */
 
 94
 95static const struct i2c_device_id max1619_id[] = {
 96	{ "max1619", 0 },
 97	{ }
 98};
 99MODULE_DEVICE_TABLE(i2c, max1619_id);
 
 
 
 
100
101static struct i2c_driver max1619_driver = {
102	.class		= I2C_CLASS_HWMON,
103	.driver = {
104		.name	= "max1619",
105	},
106	.probe		= max1619_probe,
107	.remove		= max1619_remove,
108	.id_table	= max1619_id,
109	.detect		= max1619_detect,
110	.address_list	= normal_i2c,
111};
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
112
113/*
114 * Client data (each client gets its own)
115 */
116
117struct max1619_data {
118	struct device *hwmon_dev;
119	struct mutex update_lock;
120	char valid; /* zero until following fields are valid */
121	unsigned long last_updated; /* in jiffies */
122
123	/* registers values */
124	u8 temp_input1; /* local */
125	u8 temp_input2, temp_low2, temp_high2; /* remote */
126	u8 temp_crit2;
127	u8 temp_hyst2;
128	u8 alarms; 
129};
130
131/*
132 * Sysfs stuff
133 */
134
135#define show_temp(value) \
136static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
137{ \
138	struct max1619_data *data = max1619_update_device(dev); \
139	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
140}
141show_temp(temp_input1);
142show_temp(temp_input2);
143show_temp(temp_low2);
144show_temp(temp_high2);
145show_temp(temp_crit2);
146show_temp(temp_hyst2);
147
148#define set_temp2(value, reg) \
149static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
150	size_t count) \
151{ \
152	struct i2c_client *client = to_i2c_client(dev); \
153	struct max1619_data *data = i2c_get_clientdata(client); \
154	long val = simple_strtol(buf, NULL, 10); \
155 \
156	mutex_lock(&data->update_lock); \
157	data->value = temp_to_reg(val); \
158	i2c_smbus_write_byte_data(client, reg, data->value); \
159	mutex_unlock(&data->update_lock); \
160	return count; \
161}
162
163set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
164set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
165set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
166set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
167
168static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
169{
170	struct max1619_data *data = max1619_update_device(dev);
171	return sprintf(buf, "%d\n", data->alarms);
172}
173
174static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
175			  char *buf)
176{
177	int bitnr = to_sensor_dev_attr(attr)->index;
178	struct max1619_data *data = max1619_update_device(dev);
179	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
180}
181
182static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
183static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
184static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
185	set_temp_low2);
186static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
187	set_temp_high2);
188static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
189	set_temp_crit2);
190static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
191	set_temp_hyst2);
192static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
193static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
194static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
195static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
196static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
197
198static struct attribute *max1619_attributes[] = {
199	&dev_attr_temp1_input.attr,
200	&dev_attr_temp2_input.attr,
201	&dev_attr_temp2_min.attr,
202	&dev_attr_temp2_max.attr,
203	&dev_attr_temp2_crit.attr,
204	&dev_attr_temp2_crit_hyst.attr,
205
206	&dev_attr_alarms.attr,
207	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
208	&sensor_dev_attr_temp2_fault.dev_attr.attr,
209	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
210	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
211	NULL
212};
213
214static const struct attribute_group max1619_group = {
215	.attrs = max1619_attributes,
 
216};
217
218/*
219 * Real code
220 */
221
222/* Return 0 if detection is successful, -ENODEV otherwise */
223static int max1619_detect(struct i2c_client *client,
224			  struct i2c_board_info *info)
225{
226	struct i2c_adapter *adapter = client->adapter;
227	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
228
229	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
230		return -ENODEV;
231
232	/* detection */
233	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
234	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
235	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
236	if ((reg_config & 0x03) != 0x00
237	 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
238		dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
239			client->addr);
240		return -ENODEV;
241	}
242
243	/* identification */
244	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
245	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
246	if (man_id != 0x4D || chip_id != 0x04) {
247		dev_info(&adapter->dev,
248			 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
249			 man_id, chip_id);
250		return -ENODEV;
251	}
252
253	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
254
255	return 0;
256}
257
258static int max1619_probe(struct i2c_client *new_client,
259			 const struct i2c_device_id *id)
260{
261	struct max1619_data *data;
262	int err;
 
 
 
 
 
 
 
263
264	data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
265	if (!data) {
266		err = -ENOMEM;
267		goto exit;
268	}
269
270	i2c_set_clientdata(new_client, data);
271	data->valid = 0;
272	mutex_init(&data->update_lock);
273
274	/* Initialize the MAX1619 chip */
275	max1619_init_client(new_client);
276
277	/* Register sysfs hooks */
278	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
279		goto exit_free;
280
281	data->hwmon_dev = hwmon_device_register(&new_client->dev);
282	if (IS_ERR(data->hwmon_dev)) {
283		err = PTR_ERR(data->hwmon_dev);
284		goto exit_remove_files;
285	}
286
 
287	return 0;
 
 
 
 
 
288
289exit_remove_files:
290	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
291exit_free:
292	kfree(data);
293exit:
294	return err;
295}
296
297static void max1619_init_client(struct i2c_client *client)
298{
299	u8 config;
300
301	/*
302	 * Start the conversions.
303	 */
304	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
305				  5); /* 2 Hz */
306	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
307	if (config & 0x40)
308		i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
309					  config & 0xBF); /* run */
310}
311
312static int max1619_remove(struct i2c_client *client)
313{
314	struct max1619_data *data = i2c_get_clientdata(client);
 
315
316	hwmon_device_unregister(data->hwmon_dev);
317	sysfs_remove_group(&client->dev.kobj, &max1619_group);
 
 
 
 
 
 
318
319	kfree(data);
320	return 0;
321}
 
322
323static struct max1619_data *max1619_update_device(struct device *dev)
324{
325	struct i2c_client *client = to_i2c_client(dev);
326	struct max1619_data *data = i2c_get_clientdata(client);
 
 
327
328	mutex_lock(&data->update_lock);
 
 
 
 
 
 
 
 
 
 
 
 
329
330	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
331		dev_dbg(&client->dev, "Updating max1619 data.\n");
332		data->temp_input1 = i2c_smbus_read_byte_data(client,
333					MAX1619_REG_R_LOCAL_TEMP);
334		data->temp_input2 = i2c_smbus_read_byte_data(client,
335					MAX1619_REG_R_REMOTE_TEMP);
336		data->temp_high2 = i2c_smbus_read_byte_data(client,
337					MAX1619_REG_R_REMOTE_HIGH);
338		data->temp_low2 = i2c_smbus_read_byte_data(client,
339					MAX1619_REG_R_REMOTE_LOW);
340		data->temp_crit2 = i2c_smbus_read_byte_data(client,
341					MAX1619_REG_R_REMOTE_CRIT);
342		data->temp_hyst2 = i2c_smbus_read_byte_data(client,
343					MAX1619_REG_R_TCRIT_HYST);
344		data->alarms = i2c_smbus_read_byte_data(client,
345					MAX1619_REG_R_STATUS);
346
347		data->last_updated = jiffies;
348		data->valid = 1;
349	}
 
 
350
351	mutex_unlock(&data->update_lock);
 
352
353	return data;
354}
 
 
 
 
 
 
 
 
 
355
356static int __init sensors_max1619_init(void)
357{
358	return i2c_add_driver(&max1619_driver);
359}
360
361static void __exit sensors_max1619_exit(void)
362{
363	i2c_del_driver(&max1619_driver);
364}
365
366MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
367	"Jean Delvare <khali@linux-fr.org>");
368MODULE_DESCRIPTION("MAX1619 sensor driver");
369MODULE_LICENSE("GPL");
370
371module_init(sensors_max1619_init);
372module_exit(sensors_max1619_exit);