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drivers/macintosh/windfarm_smu_sat.c
9.22 KB
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/* * Windfarm PowerMac thermal control. SMU "satellite" controller sensors. * * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org> * * Released under the terms of the GNU GPL v2. */ #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/wait.h> #include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <asm/prom.h> #include <asm/smu.h> #include <asm/pmac_low_i2c.h> #include "windfarm.h" #define VERSION "0.2" #define DEBUG #ifdef DEBUG #define DBG(args...) printk(args) #else #define DBG(args...) do { } while(0) #endif /* If the cache is older than 800ms we'll refetch it */ #define MAX_AGE msecs_to_jiffies(800) struct wf_sat { int nr; atomic_t refcnt; |
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struct mutex mutex; |
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unsigned long last_read; /* jiffies when cache last updated */ u8 cache[16]; |
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struct i2c_client *i2c; |
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struct device_node *node; }; static struct wf_sat *sats[2]; struct wf_sat_sensor { int index; int index2; /* used for power sensors */ int shift; struct wf_sat *sat; struct wf_sensor sens; }; #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, unsigned int *size) { struct wf_sat *sat; int err; unsigned int i, len; u8 *buf; u8 data[4]; /* TODO: Add the resulting partition to the device-tree */ if (sat_id > 1 || (sat = sats[sat_id]) == NULL) return NULL; |
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err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8); |
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if (err) { printk(KERN_ERR "smu_sat_get_sdb_part wr error %d ", err); return NULL; } |
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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 "); return NULL; } |
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len = err; |
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if (len == 0) { printk(KERN_ERR "smu_sat_get_sdb_part no partition %x ", id); return NULL; } len = le16_to_cpu(len); len = (len + 3) & ~3; buf = kmalloc(len, GFP_KERNEL); if (buf == NULL) return NULL; 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 ", err); goto fail; } buf[i] = data[1]; buf[i+1] = data[0]; buf[i+2] = data[3]; buf[i+3] = data[2]; } #ifdef DEBUG DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id); for (i = 0; i < len; ++i) DBG(" %x", buf[i]); DBG(" "); #endif if (size) *size = len; return (struct smu_sdbp_header *) buf; fail: kfree(buf); return NULL; } |
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EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition); |
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/* refresh the cache */ static int wf_sat_read_cache(struct wf_sat *sat) { 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; sat->last_read = jiffies; #ifdef LOTSA_DEBUG { int i; DBG(KERN_DEBUG "wf_sat_get: data is"); for (i = 0; i < 16; ++i) DBG(" %.2x", sat->cache[i]); DBG(" "); } #endif return 0; } static int wf_sat_get(struct wf_sensor *sr, s32 *value) { struct wf_sat_sensor *sens = wf_to_sat(sr); struct wf_sat *sat = sens->sat; int i, err; 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))) { err = wf_sat_read_cache(sat); if (err) goto fail; } i = sens->index * 2; val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift; if (sens->index2 >= 0) { i = sens->index2 * 2; /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */ val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4; } *value = val; err = 0; fail: |
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mutex_unlock(&sat->mutex); |
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return err; } static void wf_sat_release(struct wf_sensor *sr) { struct wf_sat_sensor *sens = wf_to_sat(sr); struct wf_sat *sat = sens->sat; if (atomic_dec_and_test(&sat->refcnt)) { |
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if (sat->nr >= 0) sats[sat->nr] = NULL; kfree(sat); } kfree(sens); } static struct wf_sensor_ops wf_sat_ops = { .get_value = wf_sat_get, .release = wf_sat_release, .owner = THIS_MODULE, }; |
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static struct i2c_driver wf_sat_driver; |
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static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev) { |
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struct i2c_board_info info; struct i2c_client *client; const u32 *reg; u8 addr; reg = of_get_property(dev, "reg", NULL); if (reg == NULL) return; addr = *reg; DBG(KERN_DEBUG "wf_sat: creating sat at address %x ", addr); memset(&info, 0, sizeof(struct i2c_board_info)); info.addr = (addr >> 1) & 0x7f; info.platform_data = dev; strlcpy(info.type, "wf_sat", I2C_NAME_SIZE); client = i2c_new_device(adapter, &info); if (client == NULL) { printk(KERN_ERR "windfarm: failed to attach smu-sat to i2c "); return; } /* * Let i2c-core delete that device on driver removal. * This is safe because i2c-core holds the core_lock mutex for us. */ |
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list_add_tail(&client->detected, &wf_sat_driver.clients); |
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} static int wf_sat_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device_node *dev = client->dev.platform_data; |
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struct wf_sat *sat; struct wf_sat_sensor *sens; |
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const u32 *reg; const char *loc, *type; |
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u8 chip, core; |
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struct device_node *child; int shift, cpu, index; char *name; int vsens[2], isens[2]; |
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sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL); if (sat == NULL) |
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return -ENOMEM; |
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sat->nr = -1; sat->node = of_node_get(dev); atomic_set(&sat->refcnt, 0); |
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mutex_init(&sat->mutex); |
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sat->i2c = client; i2c_set_clientdata(client, sat); |
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vsens[0] = vsens[1] = -1; isens[0] = isens[1] = -1; child = NULL; while ((child = of_get_next_child(dev, child)) != NULL) { |
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reg = of_get_property(child, "reg", NULL); type = of_get_property(child, "device_type", NULL); loc = of_get_property(child, "location", NULL); |
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if (reg == NULL || loc == NULL) continue; /* the cooked sensors are between 0x30 and 0x37 */ if (*reg < 0x30 || *reg > 0x37) continue; index = *reg - 0x30; /* expect location to be CPU [AB][01] ... */ if (strncmp(loc, "CPU ", 4) != 0) continue; chip = loc[4] - 'A'; core = loc[5] - '0'; if (chip > 1 || core > 1) { printk(KERN_ERR "wf_sat_create: don't understand " "location %s for %s ", loc, child->full_name); continue; } cpu = 2 * chip + core; if (sat->nr < 0) sat->nr = chip; else if (sat->nr != chip) { printk(KERN_ERR "wf_sat_create: can't cope with " "multiple CPU chips on one SAT (%s) ", loc); continue; } if (strcmp(type, "voltage-sensor") == 0) { name = "cpu-voltage"; shift = 4; vsens[core] = index; } else if (strcmp(type, "current-sensor") == 0) { name = "cpu-current"; shift = 8; isens[core] = index; } else if (strcmp(type, "temp-sensor") == 0) { name = "cpu-temp"; shift = 10; } else continue; /* hmmm shouldn't happen */ /* the +16 is enough for "cpu-voltage-n" */ sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); if (sens == NULL) { printk(KERN_ERR "wf_sat_create: couldn't create " "%s sensor %d (no memory) ", name, cpu); continue; } sens->index = index; sens->index2 = -1; sens->shift = shift; sens->sat = sat; atomic_inc(&sat->refcnt); sens->sens.ops = &wf_sat_ops; sens->sens.name = (char *) (sens + 1); snprintf(sens->sens.name, 16, "%s-%d", name, cpu); if (wf_register_sensor(&sens->sens)) { atomic_dec(&sat->refcnt); kfree(sens); } } /* make the power sensors */ for (core = 0; core < 2; ++core) { if (vsens[core] < 0 || isens[core] < 0) continue; cpu = 2 * sat->nr + core; sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); if (sens == NULL) { printk(KERN_ERR "wf_sat_create: couldn't create power " "sensor %d (no memory) ", cpu); continue; } sens->index = vsens[core]; sens->index2 = isens[core]; sens->shift = 0; sens->sat = sat; atomic_inc(&sat->refcnt); sens->sens.ops = &wf_sat_ops; sens->sens.name = (char *) (sens + 1); snprintf(sens->sens.name, 16, "cpu-power-%d", cpu); if (wf_register_sensor(&sens->sens)) { atomic_dec(&sat->refcnt); kfree(sens); } } if (sat->nr >= 0) sats[sat->nr] = sat; |
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return 0; |
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} static int wf_sat_attach(struct i2c_adapter *adapter) { struct device_node *busnode, *dev = NULL; struct pmac_i2c_bus *bus; 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) |
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if (of_device_is_compatible(dev, "smu-sat")) |
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wf_sat_create(adapter, dev); return 0; } |
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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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/* XXX TODO */ |
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sat->i2c = NULL; |
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return 0; } |
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static const struct i2c_device_id wf_sat_id[] = { { "wf_sat", 0 }, { } }; static struct i2c_driver wf_sat_driver = { .driver = { .name = "wf_smu_sat", }, .attach_adapter = wf_sat_attach, .probe = wf_sat_probe, .remove = wf_sat_remove, .id_table = wf_sat_id, }; |
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static int __init sat_sensors_init(void) { |
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return i2c_add_driver(&wf_sat_driver); |
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} |
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#if 0 /* uncomment when module_exit() below is uncommented */ |
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static void __exit sat_sensors_exit(void) { i2c_del_driver(&wf_sat_driver); } |
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#endif |
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module_init(sat_sensors_init); /*module_exit(sat_sensors_exit); Uncomment when cleanup is implemented */ MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control"); MODULE_LICENSE("GPL"); |