balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Texas Instruments TMP105 temperature sensor. |
| 3 | * |
| 4 | * Copyright (C) 2008 Nokia Corporation |
| 5 | * Written by Andrzej Zaborowski <andrew@openedhand.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation; either version 2 or |
| 10 | * (at your option) version 3 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
aurel32 | fad6cb1 | 2009-01-04 22:05:52 +0000 | [diff] [blame] | 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 20 | */ |
| 21 | |
| 22 | #include "hw.h" |
| 23 | #include "i2c.h" |
| 24 | |
| 25 | struct tmp105_s { |
| 26 | i2c_slave i2c; |
| 27 | int len; |
| 28 | uint8_t buf[2]; |
| 29 | qemu_irq pin; |
| 30 | |
| 31 | uint8_t pointer; |
| 32 | uint8_t config; |
| 33 | int16_t temperature; |
| 34 | int16_t limit[2]; |
| 35 | int faults; |
| 36 | int alarm; |
| 37 | }; |
| 38 | |
| 39 | static void tmp105_interrupt_update(struct tmp105_s *s) |
| 40 | { |
| 41 | qemu_set_irq(s->pin, s->alarm ^ ((~s->config >> 2) & 1)); /* POL */ |
| 42 | } |
| 43 | |
| 44 | static void tmp105_alarm_update(struct tmp105_s *s) |
| 45 | { |
| 46 | if ((s->config >> 0) & 1) { /* SD */ |
| 47 | if ((s->config >> 7) & 1) /* OS */ |
| 48 | s->config &= ~(1 << 7); /* OS */ |
| 49 | else |
| 50 | return; |
| 51 | } |
| 52 | |
| 53 | if ((s->config >> 1) & 1) { /* TM */ |
| 54 | if (s->temperature >= s->limit[1]) |
| 55 | s->alarm = 1; |
| 56 | else if (s->temperature < s->limit[0]) |
| 57 | s->alarm = 1; |
| 58 | } else { |
| 59 | if (s->temperature >= s->limit[1]) |
| 60 | s->alarm = 1; |
| 61 | else if (s->temperature < s->limit[0]) |
| 62 | s->alarm = 0; |
| 63 | } |
| 64 | |
| 65 | tmp105_interrupt_update(s); |
| 66 | } |
| 67 | |
| 68 | /* Units are 0.001 centigrades relative to 0 C. */ |
| 69 | void tmp105_set(i2c_slave *i2c, int temp) |
| 70 | { |
| 71 | struct tmp105_s *s = (struct tmp105_s *) i2c; |
| 72 | |
| 73 | if (temp >= 128000 || temp < -128000) { |
| 74 | fprintf(stderr, "%s: values is out of range (%i.%03i C)\n", |
| 75 | __FUNCTION__, temp / 1000, temp % 1000); |
| 76 | exit(-1); |
| 77 | } |
| 78 | |
| 79 | s->temperature = ((int16_t) (temp * 0x800 / 128000)) << 4; |
| 80 | |
| 81 | tmp105_alarm_update(s); |
| 82 | } |
| 83 | |
| 84 | static const int tmp105_faultq[4] = { 1, 2, 4, 6 }; |
| 85 | |
| 86 | static void tmp105_read(struct tmp105_s *s) |
| 87 | { |
| 88 | s->len = 0; |
| 89 | |
| 90 | if ((s->config >> 1) & 1) { /* TM */ |
| 91 | s->alarm = 0; |
| 92 | tmp105_interrupt_update(s); |
| 93 | } |
| 94 | |
| 95 | switch (s->pointer & 3) { |
| 96 | case 0: /* Temperature */ |
| 97 | s->buf[s->len ++] = (((uint16_t) s->temperature) >> 8); |
| 98 | s->buf[s->len ++] = (((uint16_t) s->temperature) >> 0) & |
| 99 | (0xf0 << ((~s->config >> 5) & 3)); /* R */ |
| 100 | break; |
| 101 | |
| 102 | case 1: /* Configuration */ |
| 103 | s->buf[s->len ++] = s->config; |
| 104 | break; |
| 105 | |
| 106 | case 2: /* T_LOW */ |
| 107 | s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 8; |
| 108 | s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 0; |
| 109 | break; |
| 110 | |
| 111 | case 3: /* T_HIGH */ |
| 112 | s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 8; |
| 113 | s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 0; |
| 114 | break; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | static void tmp105_write(struct tmp105_s *s) |
| 119 | { |
| 120 | switch (s->pointer & 3) { |
| 121 | case 0: /* Temperature */ |
| 122 | break; |
| 123 | |
| 124 | case 1: /* Configuration */ |
| 125 | if (s->buf[0] & ~s->config & (1 << 0)) /* SD */ |
| 126 | printf("%s: TMP105 shutdown\n", __FUNCTION__); |
| 127 | s->config = s->buf[0]; |
| 128 | s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */ |
| 129 | tmp105_alarm_update(s); |
| 130 | break; |
| 131 | |
| 132 | case 2: /* T_LOW */ |
| 133 | case 3: /* T_HIGH */ |
| 134 | if (s->len >= 3) |
| 135 | s->limit[s->pointer & 1] = (int16_t) |
| 136 | ((((uint16_t) s->buf[0]) << 8) | s->buf[1]); |
| 137 | tmp105_alarm_update(s); |
| 138 | break; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | static int tmp105_rx(i2c_slave *i2c) |
| 143 | { |
| 144 | struct tmp105_s *s = (struct tmp105_s *) i2c; |
| 145 | |
| 146 | if (s->len < 2) |
| 147 | return s->buf[s->len ++]; |
| 148 | else |
| 149 | return 0xff; |
| 150 | } |
| 151 | |
| 152 | static int tmp105_tx(i2c_slave *i2c, uint8_t data) |
| 153 | { |
| 154 | struct tmp105_s *s = (struct tmp105_s *) i2c; |
| 155 | |
| 156 | if (!s->len ++) |
| 157 | s->pointer = data; |
| 158 | else { |
| 159 | if (s->len <= 2) |
| 160 | s->buf[s->len - 1] = data; |
| 161 | tmp105_write(s); |
| 162 | } |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static void tmp105_event(i2c_slave *i2c, enum i2c_event event) |
| 168 | { |
| 169 | struct tmp105_s *s = (struct tmp105_s *) i2c; |
| 170 | |
| 171 | if (event == I2C_START_RECV) |
| 172 | tmp105_read(s); |
| 173 | |
| 174 | s->len = 0; |
| 175 | } |
| 176 | |
| 177 | static void tmp105_save(QEMUFile *f, void *opaque) |
| 178 | { |
| 179 | struct tmp105_s *s = (struct tmp105_s *) opaque; |
| 180 | |
| 181 | qemu_put_byte(f, s->len); |
| 182 | qemu_put_8s(f, &s->buf[0]); |
| 183 | qemu_put_8s(f, &s->buf[1]); |
| 184 | |
| 185 | qemu_put_8s(f, &s->pointer); |
| 186 | qemu_put_8s(f, &s->config); |
blueswir1 | b6c4f71 | 2008-10-02 19:14:17 +0000 | [diff] [blame] | 187 | qemu_put_sbe16s(f, &s->temperature); |
| 188 | qemu_put_sbe16s(f, &s->limit[0]); |
| 189 | qemu_put_sbe16s(f, &s->limit[1]); |
balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 190 | qemu_put_byte(f, s->alarm); |
| 191 | s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */ |
| 192 | |
| 193 | i2c_slave_save(f, &s->i2c); |
| 194 | } |
| 195 | |
| 196 | static int tmp105_load(QEMUFile *f, void *opaque, int version_id) |
| 197 | { |
| 198 | struct tmp105_s *s = (struct tmp105_s *) opaque; |
| 199 | |
| 200 | s->len = qemu_get_byte(f); |
| 201 | qemu_get_8s(f, &s->buf[0]); |
| 202 | qemu_get_8s(f, &s->buf[1]); |
| 203 | |
| 204 | qemu_get_8s(f, &s->pointer); |
| 205 | qemu_get_8s(f, &s->config); |
blueswir1 | b6c4f71 | 2008-10-02 19:14:17 +0000 | [diff] [blame] | 206 | qemu_get_sbe16s(f, &s->temperature); |
| 207 | qemu_get_sbe16s(f, &s->limit[0]); |
| 208 | qemu_get_sbe16s(f, &s->limit[1]); |
balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 209 | s->alarm = qemu_get_byte(f); |
| 210 | |
| 211 | tmp105_interrupt_update(s); |
| 212 | |
| 213 | i2c_slave_load(f, &s->i2c); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | void tmp105_reset(i2c_slave *i2c) |
| 218 | { |
| 219 | struct tmp105_s *s = (struct tmp105_s *) i2c; |
| 220 | |
| 221 | s->temperature = 0; |
| 222 | s->pointer = 0; |
| 223 | s->config = 0; |
| 224 | s->faults = tmp105_faultq[(s->config >> 3) & 3]; |
| 225 | s->alarm = 0; |
| 226 | |
| 227 | tmp105_interrupt_update(s); |
| 228 | } |
| 229 | |
balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 230 | struct i2c_slave *tmp105_init(i2c_bus *bus, qemu_irq alarm) |
| 231 | { |
| 232 | struct tmp105_s *s = (struct tmp105_s *) |
| 233 | i2c_slave_init(bus, 0, sizeof(struct tmp105_s)); |
| 234 | |
| 235 | s->i2c.event = tmp105_event; |
| 236 | s->i2c.recv = tmp105_rx; |
| 237 | s->i2c.send = tmp105_tx; |
| 238 | s->pin = alarm; |
| 239 | |
| 240 | tmp105_reset(&s->i2c); |
| 241 | |
pbrook | 18be518 | 2008-07-01 21:31:54 +0000 | [diff] [blame] | 242 | register_savevm("TMP105", -1, 0, tmp105_save, tmp105_load, s); |
balrog | 7e7c5e4 | 2008-04-14 21:57:44 +0000 | [diff] [blame] | 243 | |
| 244 | return &s->i2c; |
| 245 | } |