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363 lines
8.2 KiB
363 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Windfarm PowerMac thermal control. SMU "satellite" controller sensors. |
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* |
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* Copyright (C) 2005 Paul Mackerras, IBM Corp. <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/wait.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <asm/prom.h> |
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#include <asm/smu.h> |
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#include <asm/pmac_low_i2c.h> |
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#include "windfarm.h" |
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#define VERSION "1.0" |
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/* If the cache is older than 800ms we'll refetch it */ |
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#define MAX_AGE msecs_to_jiffies(800) |
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struct wf_sat { |
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struct kref ref; |
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int nr; |
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struct mutex mutex; |
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unsigned long last_read; /* jiffies when cache last updated */ |
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u8 cache[16]; |
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struct list_head sensors; |
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struct i2c_client *i2c; |
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struct device_node *node; |
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}; |
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static struct wf_sat *sats[2]; |
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struct wf_sat_sensor { |
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struct list_head link; |
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int index; |
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int index2; /* used for power sensors */ |
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int shift; |
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struct wf_sat *sat; |
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struct wf_sensor sens; |
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}; |
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#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens) |
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struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id, |
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unsigned int *size) |
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{ |
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struct wf_sat *sat; |
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int err; |
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unsigned int i, len; |
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u8 *buf; |
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u8 data[4]; |
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/* TODO: Add the resulting partition to the device-tree */ |
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if (sat_id > 1 || (sat = sats[sat_id]) == NULL) |
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return NULL; |
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err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8); |
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if (err) { |
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printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err); |
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return NULL; |
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} |
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err = i2c_smbus_read_word_data(sat->i2c, 9); |
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if (err < 0) { |
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printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n"); |
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return NULL; |
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} |
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len = err; |
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if (len == 0) { |
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printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id); |
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return NULL; |
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} |
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len = le16_to_cpu(len); |
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len = (len + 3) & ~3; |
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buf = kmalloc(len, GFP_KERNEL); |
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if (buf == NULL) |
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return NULL; |
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for (i = 0; i < len; i += 4) { |
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err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data); |
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if (err < 0) { |
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printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n", |
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err); |
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goto fail; |
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} |
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buf[i] = data[1]; |
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buf[i+1] = data[0]; |
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buf[i+2] = data[3]; |
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buf[i+3] = data[2]; |
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} |
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printk(KERN_DEBUG "sat %d partition %x:", sat_id, id); |
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print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, |
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16, 1, buf, len, false); |
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if (size) |
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*size = len; |
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return (struct smu_sdbp_header *) buf; |
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fail: |
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kfree(buf); |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition); |
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/* refresh the cache */ |
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static int wf_sat_read_cache(struct wf_sat *sat) |
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{ |
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int err; |
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err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache); |
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if (err < 0) |
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return err; |
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sat->last_read = jiffies; |
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#ifdef LOTSA_DEBUG |
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{ |
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int i; |
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printk(KERN_DEBUG "wf_sat_get: data is"); |
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print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, |
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16, 1, sat->cache, 16, false); |
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} |
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#endif |
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return 0; |
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} |
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static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value) |
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{ |
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struct wf_sat_sensor *sens = wf_to_sat(sr); |
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struct wf_sat *sat = sens->sat; |
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int i, err; |
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s32 val; |
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if (sat->i2c == NULL) |
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return -ENODEV; |
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mutex_lock(&sat->mutex); |
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if (time_after(jiffies, (sat->last_read + MAX_AGE))) { |
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err = wf_sat_read_cache(sat); |
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if (err) |
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goto fail; |
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} |
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i = sens->index * 2; |
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val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift; |
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if (sens->index2 >= 0) { |
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i = sens->index2 * 2; |
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/* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */ |
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val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4; |
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} |
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*value = val; |
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err = 0; |
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fail: |
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mutex_unlock(&sat->mutex); |
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return err; |
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} |
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static void wf_sat_release(struct kref *ref) |
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{ |
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struct wf_sat *sat = container_of(ref, struct wf_sat, ref); |
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if (sat->nr >= 0) |
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sats[sat->nr] = NULL; |
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kfree(sat); |
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} |
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static void wf_sat_sensor_release(struct wf_sensor *sr) |
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{ |
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struct wf_sat_sensor *sens = wf_to_sat(sr); |
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struct wf_sat *sat = sens->sat; |
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kfree(sens); |
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kref_put(&sat->ref, wf_sat_release); |
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} |
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static const struct wf_sensor_ops wf_sat_ops = { |
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.get_value = wf_sat_sensor_get, |
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.release = wf_sat_sensor_release, |
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.owner = THIS_MODULE, |
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}; |
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static int wf_sat_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct device_node *dev = client->dev.of_node; |
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struct wf_sat *sat; |
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struct wf_sat_sensor *sens; |
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const u32 *reg; |
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const char *loc; |
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u8 chip, core; |
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struct device_node *child; |
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int shift, cpu, index; |
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char *name; |
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int vsens[2], isens[2]; |
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sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL); |
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if (sat == NULL) |
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return -ENOMEM; |
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sat->nr = -1; |
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sat->node = of_node_get(dev); |
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kref_init(&sat->ref); |
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mutex_init(&sat->mutex); |
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sat->i2c = client; |
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INIT_LIST_HEAD(&sat->sensors); |
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i2c_set_clientdata(client, sat); |
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vsens[0] = vsens[1] = -1; |
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isens[0] = isens[1] = -1; |
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for_each_child_of_node(dev, child) { |
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reg = of_get_property(child, "reg", NULL); |
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loc = of_get_property(child, "location", NULL); |
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if (reg == NULL || loc == NULL) |
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continue; |
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/* the cooked sensors are between 0x30 and 0x37 */ |
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if (*reg < 0x30 || *reg > 0x37) |
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continue; |
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index = *reg - 0x30; |
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/* expect location to be CPU [AB][01] ... */ |
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if (strncmp(loc, "CPU ", 4) != 0) |
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continue; |
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chip = loc[4] - 'A'; |
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core = loc[5] - '0'; |
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if (chip > 1 || core > 1) { |
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printk(KERN_ERR "wf_sat_create: don't understand " |
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"location %s for %pOF\n", loc, child); |
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continue; |
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} |
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cpu = 2 * chip + core; |
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if (sat->nr < 0) |
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sat->nr = chip; |
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else if (sat->nr != chip) { |
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printk(KERN_ERR "wf_sat_create: can't cope with " |
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"multiple CPU chips on one SAT (%s)\n", loc); |
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continue; |
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} |
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if (of_node_is_type(child, "voltage-sensor")) { |
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name = "cpu-voltage"; |
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shift = 4; |
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vsens[core] = index; |
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} else if (of_node_is_type(child, "current-sensor")) { |
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name = "cpu-current"; |
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shift = 8; |
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isens[core] = index; |
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} else if (of_node_is_type(child, "temp-sensor")) { |
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name = "cpu-temp"; |
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shift = 10; |
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} else |
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continue; /* hmmm shouldn't happen */ |
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/* the +16 is enough for "cpu-voltage-n" */ |
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sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); |
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if (sens == NULL) { |
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printk(KERN_ERR "wf_sat_create: couldn't create " |
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"%s sensor %d (no memory)\n", name, cpu); |
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continue; |
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} |
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sens->index = index; |
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sens->index2 = -1; |
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sens->shift = shift; |
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sens->sat = sat; |
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sens->sens.ops = &wf_sat_ops; |
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sens->sens.name = (char *) (sens + 1); |
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snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu); |
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if (wf_register_sensor(&sens->sens)) |
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kfree(sens); |
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else { |
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list_add(&sens->link, &sat->sensors); |
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kref_get(&sat->ref); |
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} |
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} |
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/* make the power sensors */ |
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for (core = 0; core < 2; ++core) { |
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if (vsens[core] < 0 || isens[core] < 0) |
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continue; |
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cpu = 2 * sat->nr + core; |
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sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); |
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if (sens == NULL) { |
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printk(KERN_ERR "wf_sat_create: couldn't create power " |
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"sensor %d (no memory)\n", cpu); |
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continue; |
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} |
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sens->index = vsens[core]; |
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sens->index2 = isens[core]; |
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sens->shift = 0; |
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sens->sat = sat; |
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sens->sens.ops = &wf_sat_ops; |
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sens->sens.name = (char *) (sens + 1); |
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snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu); |
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if (wf_register_sensor(&sens->sens)) |
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kfree(sens); |
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else { |
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list_add(&sens->link, &sat->sensors); |
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kref_get(&sat->ref); |
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} |
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} |
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if (sat->nr >= 0) |
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sats[sat->nr] = sat; |
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return 0; |
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} |
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static int wf_sat_remove(struct i2c_client *client) |
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{ |
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struct wf_sat *sat = i2c_get_clientdata(client); |
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struct wf_sat_sensor *sens; |
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/* release sensors */ |
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while(!list_empty(&sat->sensors)) { |
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sens = list_first_entry(&sat->sensors, |
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struct wf_sat_sensor, link); |
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list_del(&sens->link); |
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wf_unregister_sensor(&sens->sens); |
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} |
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sat->i2c = NULL; |
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kref_put(&sat->ref, wf_sat_release); |
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return 0; |
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} |
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static const struct i2c_device_id wf_sat_id[] = { |
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{ "MAC,smu-sat", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, wf_sat_id); |
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static const struct of_device_id wf_sat_of_id[] = { |
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{ .compatible = "smu-sat", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, wf_sat_of_id); |
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static struct i2c_driver wf_sat_driver = { |
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.driver = { |
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.name = "wf_smu_sat", |
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.of_match_table = wf_sat_of_id, |
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}, |
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.probe = wf_sat_probe, |
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.remove = wf_sat_remove, |
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.id_table = wf_sat_id, |
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}; |
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module_i2c_driver(wf_sat_driver); |
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MODULE_AUTHOR("Paul Mackerras <[email protected]>"); |
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MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control"); |
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MODULE_LICENSE("GPL");
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