[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / windfarm_max6690_sensor.c

/*
 * Windfarm PowerMac thermal control.  MAX6690 sensor.
 *
 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
 *
 * Use and redistribute under the terms of the GNU GPL v2.
 */
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <asm/prom.h>
#include <asm/pmac_low_i2c.h>

#include "windfarm.h"

#define VERSION "0.1"

/* This currently only exports the external temperature sensor,
   since that's all the control loops need. */

/* Some MAX6690 register numbers */
#define MAX6690_INTERNAL_TEMP	0
#define MAX6690_EXTERNAL_TEMP	1

struct wf_6690_sensor {
	struct i2c_client	i2c;
	struct wf_sensor	sens;
};

#define wf_to_6690(x)	container_of((x), struct wf_6690_sensor, sens)
#define i2c_to_6690(x)	container_of((x), struct wf_6690_sensor, i2c)

static int wf_max6690_attach(struct i2c_adapter *adapter);
static int wf_max6690_detach(struct i2c_client *client);

static struct i2c_driver wf_max6690_driver = {
	.driver = {
		.name		= "wf_max6690",
	},
	.attach_adapter	= wf_max6690_attach,
	.detach_client	= wf_max6690_detach,
};

static int wf_max6690_get(struct wf_sensor *sr, s32 *value)
{
	struct wf_6690_sensor *max = wf_to_6690(sr);
	s32 data;

	if (max->i2c.adapter == NULL)
		return -ENODEV;

	/* chip gets initialized by firmware */
	data = i2c_smbus_read_byte_data(&max->i2c, MAX6690_EXTERNAL_TEMP);
	if (data < 0)
		return data;
	*value = data << 16;
	return 0;
}

static void wf_max6690_release(struct wf_sensor *sr)
{
	struct wf_6690_sensor *max = wf_to_6690(sr);

	if (max->i2c.adapter) {
		i2c_detach_client(&max->i2c);
		max->i2c.adapter = NULL;
	}
	kfree(max);
}

static struct wf_sensor_ops wf_max6690_ops = {
	.get_value	= wf_max6690_get,
	.release	= wf_max6690_release,
	.owner		= THIS_MODULE,
};

static void wf_max6690_create(struct i2c_adapter *adapter, u8 addr)
{
	struct wf_6690_sensor *max;
	char *name = "u4-temp";

	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
	if (max == NULL) {
		printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor %s: "
		       "no memory\n", name);
		return;
	}

	max->sens.ops = &wf_max6690_ops;
	max->sens.name = name;
	max->i2c.addr = addr >> 1;
	max->i2c.adapter = adapter;
	max->i2c.driver = &wf_max6690_driver;
	strncpy(max->i2c.name, name, I2C_NAME_SIZE-1);

	if (i2c_attach_client(&max->i2c)) {
		printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
		goto fail;
	}

	if (wf_register_sensor(&max->sens)) {
		i2c_detach_client(&max->i2c);
		goto fail;
	}

	return;

 fail:
	kfree(max);
}

static int wf_max6690_attach(struct i2c_adapter *adapter)
{
	struct device_node *busnode, *dev = NULL;
	struct pmac_i2c_bus *bus;
	const char *loc;
	u32 *reg;

	bus = pmac_i2c_adapter_to_bus(adapter);
	if (bus == NULL)
		return -ENODEV;
	busnode = pmac_i2c_get_bus_node(bus);

	while ((dev = of_get_next_child(busnode, dev)) != NULL) {
		if (!device_is_compatible(dev, "max6690"))
			continue;
		loc = get_property(dev, "hwsensor-location", NULL);
		reg = (u32 *) get_property(dev, "reg", NULL);
		if (!loc || !reg)
			continue;
		printk("found max6690, loc=%s reg=%x\n", loc, *reg);
		if (strcmp(loc, "BACKSIDE"))
			continue;
		wf_max6690_create(adapter, *reg);
	}

	return 0;
}

static int wf_max6690_detach(struct i2c_client *client)
{
	struct wf_6690_sensor *max = i2c_to_6690(client);

	max->i2c.adapter = NULL;
	wf_unregister_sensor(&max->sens);

	return 0;
}

static int __init wf_max6690_sensor_init(void)
{
	return i2c_add_driver(&wf_max6690_driver);
}

static void __exit wf_max6690_sensor_exit(void)
{
	i2c_del_driver(&wf_max6690_driver);
}

module_init(wf_max6690_sensor_init);
module_exit(wf_max6690_sensor_exit);

MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
ac171c46 BH	1	/*
	2	* Windfarm PowerMac thermal control. MAX6690 sensor.
	3	*
	4	* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
	5	*
	6	* Use and redistribute under the terms of the GNU GPL v2.
	7	*/
	8	#include <linux/types.h>
	9	#include <linux/errno.h>
	10	#include <linux/kernel.h>
	11	#include <linux/init.h>
	12	#include <linux/slab.h>
	13	#include <linux/i2c.h>
	14	#include <linux/i2c-dev.h>
	15	#include <asm/prom.h>
	16	#include <asm/pmac_low_i2c.h>
	17
	18	#include "windfarm.h"
	19
	20	#define VERSION "0.1"
	21
	22	/* This currently only exports the external temperature sensor,
	23	since that's all the control loops need. */
	24
	25	/* Some MAX6690 register numbers */
	26	#define MAX6690_INTERNAL_TEMP 0
	27	#define MAX6690_EXTERNAL_TEMP 1
	28
	29	struct wf_6690_sensor {
	30	struct i2c_client i2c;
	31	struct wf_sensor sens;
	32	};
	33
	34	#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
	35	#define i2c_to_6690(x) container_of((x), struct wf_6690_sensor, i2c)
	36
	37	static int wf_max6690_attach(struct i2c_adapter *adapter);
	38	static int wf_max6690_detach(struct i2c_client *client);
	39
	40	static struct i2c_driver wf_max6690_driver = {
	41	.driver = {
	42	.name = "wf_max6690",
	43	},
	44	.attach_adapter = wf_max6690_attach,
	45	.detach_client = wf_max6690_detach,
	46	};
	47
	48	static int wf_max6690_get(struct wf_sensor sr, s32 value)
	49	{
	50	struct wf_6690_sensor *max = wf_to_6690(sr);
	51	s32 data;
	52
	53	if (max->i2c.adapter == NULL)
	54	return -ENODEV;
	55
	56	/* chip gets initialized by firmware */
	57	data = i2c_smbus_read_byte_data(&max->i2c, MAX6690_EXTERNAL_TEMP);
	58	if (data < 0)
	59	return data;
	60	*value = data << 16;
	61	return 0;
	62	}
	63
	64	static void wf_max6690_release(struct wf_sensor *sr)
65	{
66	struct wf_6690_sensor *max = wf_to_6690(sr);
67
68	if (max->i2c.adapter) {
69	i2c_detach_client(&max->i2c);
70	max->i2c.adapter = NULL;
71	}
72	kfree(max);
73	}
74
75	static struct wf_sensor_ops wf_max6690_ops = {
76	.get_value = wf_max6690_get,
77	.release = wf_max6690_release,
78	.owner = THIS_MODULE,
79	};
80
81	static void wf_max6690_create(struct i2c_adapter *adapter, u8 addr)
82	{
83	struct wf_6690_sensor *max;
84	char *name = "u4-temp";
85
86	max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
87	if (max == NULL) {
88	printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor %s: "
89	"no memory\n", name);
90	return;
91	}
92
93	max->sens.ops = &wf_max6690_ops;
94	max->sens.name = name;
95	max->i2c.addr = addr >> 1;
96	max->i2c.adapter = adapter;
97	max->i2c.driver = &wf_max6690_driver;
98	strncpy(max->i2c.name, name, I2C_NAME_SIZE-1);
99
100	if (i2c_attach_client(&max->i2c)) {
101	printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
102	goto fail;
103	}
104
105	if (wf_register_sensor(&max->sens)) {
106	i2c_detach_client(&max->i2c);
107	goto fail;
108	}
109
110	return;
111
112	fail:
113	kfree(max);
114	}
115
116	static int wf_max6690_attach(struct i2c_adapter *adapter)
117	{
118	struct device_node busnode, dev = NULL;
119	struct pmac_i2c_bus *bus;
120	const char *loc;
121	u32 *reg;
122
123	bus = pmac_i2c_adapter_to_bus(adapter);
124	if (bus == NULL)
125	return -ENODEV;
126	busnode = pmac_i2c_get_bus_node(bus);
127
128	while ((dev = of_get_next_child(busnode, dev)) != NULL) {
129	if (!device_is_compatible(dev, "max6690"))
130	continue;
131	loc = get_property(dev, "hwsensor-location", NULL);
132	reg = (u32 *) get_property(dev, "reg", NULL);
133	if (!loc \|\| !reg)
134	continue;
135	printk("found max6690, loc=%s reg=%x\n", loc, *reg);
136	if (strcmp(loc, "BACKSIDE"))
137	continue;
138	wf_max6690_create(adapter, *reg);
139	}
140
141	return 0;
142	}
143
144	static int wf_max6690_detach(struct i2c_client *client)
145	{
146	struct wf_6690_sensor *max = i2c_to_6690(client);
147
148	max->i2c.adapter = NULL;
149	wf_unregister_sensor(&max->sens);
150
151	return 0;
152	}
153
154	static int __init wf_max6690_sensor_init(void)
155	{
156	return i2c_add_driver(&wf_max6690_driver);
157	}
158
159	static void __exit wf_max6690_sensor_exit(void)
160	{
161	i2c_del_driver(&wf_max6690_driver);
162	}
163
164	module_init(wf_max6690_sensor_init);
165	module_exit(wf_max6690_sensor_exit);
166
167	MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
168	MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
169	MODULE_LICENSE("GPL");