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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | // SPDX-License-Identifier: GPL-2.0-only /* * Windfarm PowerMac thermal control. LM75 sensor * * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> */ #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/of.h> #include <asm/machdep.h> #include <asm/io.h> #include <asm/sections.h> #include <asm/pmac_low_i2c.h> #include "windfarm.h" #define VERSION "1.0" #undef DEBUG #ifdef DEBUG #define DBG(args...) printk(args) #else #define DBG(args...) do { } while(0) #endif struct wf_lm75_sensor { unsigned int ds1775 : 1; unsigned int inited : 1; struct i2c_client *i2c; struct wf_sensor sens; }; #define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens) 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 == 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); kfree(lm); } static const struct wf_sensor_ops wf_lm75_ops = { .get_value = wf_lm75_get, .release = wf_lm75_release, .owner = THIS_MODULE, }; static int wf_lm75_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct wf_lm75_sensor *lm; int rc, ds1775; const char *name, *loc; if (id) ds1775 = id->driver_data; else ds1775 = !!of_device_get_match_data(&client->dev); DBG("wf_lm75: creating %s device at address 0x%02x\n", ds1775 ? "ds1775" : "lm75", client->addr); loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL); if (!loc) { dev_warn(&client->dev, "Missing hwsensor-location property!\n"); return -ENXIO; } /* 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")) name = "hd-temp"; else if (!strcmp(loc, "Incoming Air Temp")) name = "incoming-air-temp"; else if (!strcmp(loc, "ODD Temp")) name = "optical-drive-temp"; else if (!strcmp(loc, "HD Temp")) name = "hard-drive-temp"; else if (!strcmp(loc, "PCI SLOTS")) name = "slots-temp"; else if (!strcmp(loc, "CPU A INLET")) name = "cpu-inlet-temp-0"; else if (!strcmp(loc, "CPU B INLET")) name = "cpu-inlet-temp-1"; else return -ENXIO; lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); if (lm == NULL) return -ENODEV; lm->inited = 0; lm->ds1775 = ds1775; lm->i2c = client; lm->sens.name = name; lm->sens.ops = &wf_lm75_ops; i2c_set_clientdata(client, lm); rc = wf_register_sensor(&lm->sens); if (rc) kfree(lm); return rc; } static void wf_lm75_remove(struct i2c_client *client) { struct wf_lm75_sensor *lm = i2c_get_clientdata(client); /* Mark client detached */ lm->i2c = NULL; /* release sensor */ wf_unregister_sensor(&lm->sens); } static const struct i2c_device_id wf_lm75_id[] = { { "MAC,lm75", 0 }, { "MAC,ds1775", 1 }, { } }; MODULE_DEVICE_TABLE(i2c, wf_lm75_id); static const struct of_device_id wf_lm75_of_id[] = { { .compatible = "lm75", .data = (void *)0}, { .compatible = "ds1775", .data = (void *)1 }, { } }; MODULE_DEVICE_TABLE(of, wf_lm75_of_id); static struct i2c_driver wf_lm75_driver = { .driver = { .name = "wf_lm75", .of_match_table = wf_lm75_of_id, }, .probe = wf_lm75_probe, .remove = wf_lm75_remove, .id_table = wf_lm75_id, }; module_i2c_driver(wf_lm75_driver); MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); MODULE_LICENSE("GPL"); |