[deliverable/linux.git] / drivers / macintosh / windfarm_lm75_sensor.c

/*
 * Windfarm PowerMac thermal control. LM75 sensor
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/pmac_low_i2c.h>

#include "windfarm.h"

#define VERSION "0.1"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

struct wf_lm75_sensor {
	int			ds1775 : 1;
	int			inited : 1;
	struct 	i2c_client	i2c;
	struct 	wf_sensor	sens;
};
#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
#define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c)

static int wf_lm75_attach(struct i2c_adapter *adapter);
static int wf_lm75_detach(struct i2c_client *client);

static struct i2c_driver wf_lm75_driver = {
	.driver = {
		.name	= "wf_lm75",
	},
	.attach_adapter	= wf_lm75_attach,
	.detach_client	= wf_lm75_detach,
};

static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
{
	struct wf_lm75_sensor *lm = wf_to_lm75(sr);
	s32 data;

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

	/* Init chip if necessary */
	if (!lm->inited) {
		u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);

		DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
		    sr->name, cfg);

		/* clear shutdown bit, keep other settings as left by
		 * the firmware for now
		 */
		cfg_new = cfg & ~0x01;
		i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
		lm->inited = 1;

		/* If we just powered it up, let's wait 200 ms */
		msleep(200);
	}

	/* Read temperature register */
	data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
	data <<= 8;
	*value = data;

	return 0;
}

static void wf_lm75_release(struct wf_sensor *sr)
{
	struct wf_lm75_sensor *lm = wf_to_lm75(sr);

	/* check if client is registered and detach from i2c */
	if (lm->i2c.adapter) {
		i2c_detach_client(&lm->i2c);
		lm->i2c.adapter = NULL;
	}

	kfree(lm);
}

static struct wf_sensor_ops wf_lm75_ops = {
	.get_value	= wf_lm75_get,
	.release	= wf_lm75_release,
	.owner		= THIS_MODULE,
};

static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
					     u8 addr, int ds1775,
					     const char *loc)
{
	struct wf_lm75_sensor *lm;

	DBG("wf_lm75: creating  %s device at address 0x%02x\n",
	    ds1775 ? "ds1775" : "lm75", addr);

	lm = kmalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
	if (lm == NULL)
		return NULL;
	memset(lm, 0, sizeof(struct wf_lm75_sensor));

	/* Usual rant about sensor names not beeing very consistent in
	 * the device-tree, oh well ...
	 * Add more entries below as you deal with more setups
	 */
	if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
		lm->sens.name = "hd-temp";
	else
		goto fail;

	lm->inited = 0;
	lm->sens.ops = &wf_lm75_ops;
	lm->ds1775 = ds1775;
	lm->i2c.addr = (addr >> 1) & 0x7f;
	lm->i2c.adapter = adapter;
	lm->i2c.driver = &wf_lm75_driver;
	strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);

	if (i2c_attach_client(&lm->i2c)) {
		printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
		       ds1775 ? "ds1775" : "lm75", lm->i2c.name);
		goto fail;
	}

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

	return lm;
 fail:
	kfree(lm);
	return NULL;
}

static int wf_lm75_attach(struct i2c_adapter *adapter)
{
	struct device_node *busnode, *dev;
	struct pmac_i2c_bus *bus;

	DBG("wf_lm75: adapter %s detected\n", adapter->name);

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

	DBG("wf_lm75: bus found, looking for device...\n");

	/* Now look for lm75(s) in there */
	for (dev = NULL;
	     (dev = of_get_next_child(busnode, dev)) != NULL;) {
		const char *loc =
			get_property(dev, "hwsensor-location", NULL);
		u32 *reg = (u32 *)get_property(dev, "reg", NULL);
		DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg);
		if (loc == NULL || reg == NULL)
			continue;
		/* real lm75 */
		if (device_is_compatible(dev, "lm75"))
			wf_lm75_create(adapter, *reg, 0, loc);
		/* ds1775 (compatible, better resolution */
		else if (device_is_compatible(dev, "ds1775"))
			wf_lm75_create(adapter, *reg, 1, loc);
	}
	return 0;
}

static int wf_lm75_detach(struct i2c_client *client)
{
	struct wf_lm75_sensor *lm = i2c_to_lm75(client);

	DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);

	/* Mark client detached */
	lm->i2c.adapter = NULL;

	/* release sensor */
	wf_unregister_sensor(&lm->sens);

	return 0;
}

static int __init wf_lm75_sensor_init(void)
{
	return i2c_add_driver(&wf_lm75_driver);
}

static void __exit wf_lm75_sensor_exit(void)
{
	i2c_del_driver(&wf_lm75_driver);
}


module_init(wf_lm75_sensor_init);
module_exit(wf_lm75_sensor_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");
Commit	Line	Data
75722d39 BH	1	/*
	2	* Windfarm PowerMac thermal control. LM75 sensor
	3	*
	4	* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
	5	* <benh@kernel.crashing.org>
	6	*
	7	* Released under the term of the GNU GPL v2.
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/errno.h>
	12	#include <linux/kernel.h>
	13	#include <linux/delay.h>
	14	#include <linux/slab.h>
	15	#include <linux/init.h>
	16	#include <linux/wait.h>
	17	#include <linux/i2c.h>
	18	#include <linux/i2c-dev.h>
	19	#include <asm/prom.h>
	20	#include <asm/machdep.h>
	21	#include <asm/io.h>
	22	#include <asm/system.h>
	23	#include <asm/sections.h>
a28d3af2	24	#include <asm/pmac_low_i2c.h>
75722d39 BH	25
	26	#include "windfarm.h"
	27
	28	#define VERSION "0.1"
	29
	30	#undef DEBUG
	31
	32	#ifdef DEBUG
	33	#define DBG(args...) printk(args)
	34	#else
	35	#define DBG(args...) do { } while(0)
	36	#endif
	37
	38	struct wf_lm75_sensor {
	39	int ds1775 : 1;
	40	int inited : 1;
	41	struct i2c_client i2c;
	42	struct wf_sensor sens;
	43	};
	44	#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
	45	#define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c)
	46
	47	static int wf_lm75_attach(struct i2c_adapter *adapter);
	48	static int wf_lm75_detach(struct i2c_client *client);
	49
	50	static struct i2c_driver wf_lm75_driver = {
a33ca232	51	.driver = {
a33ca232 LR	52	.name = "wf_lm75",
a33ca232 LR	53	},
75722d39 BH	54	.attach_adapter = wf_lm75_attach,
	55	.detach_client = wf_lm75_detach,
	56	};
	57
	58	static int wf_lm75_get(struct wf_sensor sr, s32 value)
	59	{
	60	struct wf_lm75_sensor *lm = wf_to_lm75(sr);
	61	s32 data;
	62
	63	if (lm->i2c.adapter == NULL)
	64	return -ENODEV;
	65
	66	/* Init chip if necessary */
	67	if (!lm->inited) {
	68	u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
	69
	70	DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
	71	sr->name, cfg);
	72
	73	/* clear shutdown bit, keep other settings as left by
	74	* the firmware for now
	75	*/
	76	cfg_new = cfg & ~0x01;
	77	i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
	78	lm->inited = 1;
	79
	80	/* If we just powered it up, let's wait 200 ms */
	81	msleep(200);
	82	}
	83
	84	/* Read temperature register */
	85	data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
	86	data <<= 8;
	87	*value = data;
	88
	89	return 0;
	90	}
	91
	92	static void wf_lm75_release(struct wf_sensor *sr)
	93	{
	94	struct wf_lm75_sensor *lm = wf_to_lm75(sr);
	95
	96	/* check if client is registered and detach from i2c */
	97	if (lm->i2c.adapter) {
	98	i2c_detach_client(&lm->i2c);
	99	lm->i2c.adapter = NULL;
	100	}
	101
	102	kfree(lm);
	103	}
	104
	105	static struct wf_sensor_ops wf_lm75_ops = {
	106	.get_value = wf_lm75_get,
	107	.release = wf_lm75_release,
	108	.owner = THIS_MODULE,
	109	};
	110
	111	static struct wf_lm75_sensor wf_lm75_create(struct i2c_adapter adapter,
	112	u8 addr, int ds1775,
	113	const char *loc)
	114	{
	115	struct wf_lm75_sensor *lm;
	116
	117	DBG("wf_lm75: creating %s device at address 0x%02x\n",
118	ds1775 ? "ds1775" : "lm75", addr);
119
120	lm = kmalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
121	if (lm == NULL)
122	return NULL;
123	memset(lm, 0, sizeof(struct wf_lm75_sensor));
124
125	/* Usual rant about sensor names not beeing very consistent in
126	* the device-tree, oh well ...
127	* Add more entries below as you deal with more setups
128	*/
129	if (!strcmp(loc, "Hard drive") \|\| !strcmp(loc, "DRIVE BAY"))
130	lm->sens.name = "hd-temp";
131	else
132	goto fail;
133
134	lm->inited = 0;
135	lm->sens.ops = &wf_lm75_ops;
136	lm->ds1775 = ds1775;
137	lm->i2c.addr = (addr >> 1) & 0x7f;
138	lm->i2c.adapter = adapter;
139	lm->i2c.driver = &wf_lm75_driver;
140	strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
141
142	if (i2c_attach_client(&lm->i2c)) {
143	printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
144	ds1775 ? "ds1775" : "lm75", lm->i2c.name);
145	goto fail;
146	}
147
148	if (wf_register_sensor(&lm->sens)) {
149	i2c_detach_client(&lm->i2c);
150	goto fail;
151	}
152
153	return lm;
154	fail:
155	kfree(lm);
156	return NULL;
157	}
158
159	static int wf_lm75_attach(struct i2c_adapter *adapter)
160	{
a28d3af2 BH	161	struct device_node busnode, dev;
a28d3af2 BH	162	struct pmac_i2c_bus *bus;
75722d39 BH	163
	164	DBG("wf_lm75: adapter %s detected\n", adapter->name);
	165
a28d3af2 BH	166	bus = pmac_i2c_adapter_to_bus(adapter);
	167	if (bus == NULL)
	168	return -ENODEV;
	169	busnode = pmac_i2c_get_bus_node(bus);
75722d39 BH	170
	171	DBG("wf_lm75: bus found, looking for device...\n");
	172
	173	/* Now look for lm75(s) in there */
	174	for (dev = NULL;
a28d3af2	175	(dev = of_get_next_child(busnode, dev)) != NULL;) {
75722d39 BH	176	const char *loc =
	177	get_property(dev, "hwsensor-location", NULL);
	178	u32 reg = (u32 )get_property(dev, "reg", NULL);
	179	DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg);
	180	if (loc == NULL \|\| reg == NULL)
	181	continue;
	182	/* real lm75 */
	183	if (device_is_compatible(dev, "lm75"))
	184	wf_lm75_create(adapter, *reg, 0, loc);
	185	/* ds1775 (compatible, better resolution */
	186	else if (device_is_compatible(dev, "ds1775"))
	187	wf_lm75_create(adapter, *reg, 1, loc);
	188	}
75722d39 BH	189	return 0;
	190	}
	191
	192	static int wf_lm75_detach(struct i2c_client *client)
	193	{
	194	struct wf_lm75_sensor *lm = i2c_to_lm75(client);
	195
	196	DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
	197
	198	/* Mark client detached */
	199	lm->i2c.adapter = NULL;
	200
	201	/* release sensor */
	202	wf_unregister_sensor(&lm->sens);
	203
	204	return 0;
	205	}
	206
	207	static int __init wf_lm75_sensor_init(void)
	208	{
c9662b4b	209	return i2c_add_driver(&wf_lm75_driver);
75722d39 BH	210	}
	211
	212	static void __exit wf_lm75_sensor_exit(void)
	213	{
	214	i2c_del_driver(&wf_lm75_driver);
	215	}
	216
	217
	218	module_init(wf_lm75_sensor_init);
	219	module_exit(wf_lm75_sensor_exit);
	220
	221	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	222	MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
	223	MODULE_LICENSE("GPL");
	224