Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * ChromeOS EC multi-function device (SPI) |
| 3 | * |
| 4 | * Copyright (C) 2012 Google, Inc |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/mfd/cros_ec.h> |
| 20 | #include <linux/mfd/cros_ec_commands.h> |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 21 | #include <linux/of.h> |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/spi/spi.h> |
| 25 | |
| 26 | |
| 27 | /* The header byte, which follows the preamble */ |
| 28 | #define EC_MSG_HEADER 0xec |
| 29 | |
| 30 | /* |
| 31 | * Number of EC preamble bytes we read at a time. Since it takes |
| 32 | * about 400-500us for the EC to respond there is not a lot of |
| 33 | * point in tuning this. If the EC could respond faster then |
| 34 | * we could increase this so that might expect the preamble and |
| 35 | * message to occur in a single transaction. However, the maximum |
| 36 | * SPI transfer size is 256 bytes, so at 5MHz we need a response |
| 37 | * time of perhaps <320us (200 bytes / 1600 bits). |
| 38 | */ |
| 39 | #define EC_MSG_PREAMBLE_COUNT 32 |
| 40 | |
| 41 | /* |
Doug Anderson | 9c0b54a | 2014-04-30 10:44:07 -0700 | [diff] [blame] | 42 | * Allow for a long time for the EC to respond. We support i2c |
| 43 | * tunneling and support fairly long messages for the tunnel (249 |
| 44 | * bytes long at the moment). If we're talking to a 100 kHz device |
| 45 | * on the other end and need to transfer ~256 bytes, then we need: |
| 46 | * 10 us/bit * ~10 bits/byte * ~256 bytes = ~25ms |
| 47 | * |
Doug Anderson | ca691f7 | 2017-03-01 12:58:32 +0100 | [diff] [blame] | 48 | * We'll wait 8 times that to handle clock stretching and other |
| 49 | * paranoia. Note that some battery gas gauge ICs claim to have a |
| 50 | * clock stretch of 144ms in rare situations. That's incentive for |
| 51 | * not directly passing i2c through, but it's too late for that for |
| 52 | * existing hardware. |
Doug Anderson | 9c0b54a | 2014-04-30 10:44:07 -0700 | [diff] [blame] | 53 | * |
| 54 | * It's pretty unlikely that we'll really see a 249 byte tunnel in |
| 55 | * anything other than testing. If this was more common we might |
| 56 | * consider having slow commands like this require a GET_STATUS |
| 57 | * wait loop. The 'flash write' command would be another candidate |
| 58 | * for this, clocking in at 2-3ms. |
| 59 | */ |
Doug Anderson | ca691f7 | 2017-03-01 12:58:32 +0100 | [diff] [blame] | 60 | #define EC_MSG_DEADLINE_MS 200 |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 61 | |
| 62 | /* |
| 63 | * Time between raising the SPI chip select (for the end of a |
| 64 | * transaction) and dropping it again (for the next transaction). |
Derek Basehore | 49f91ac | 2013-11-18 11:30:48 +0100 | [diff] [blame] | 65 | * If we go too fast, the EC will miss the transaction. We know that we |
| 66 | * need at least 70 us with the 16 MHz STM32 EC, so go with 200 us to be |
| 67 | * safe. |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 68 | */ |
Derek Basehore | 49f91ac | 2013-11-18 11:30:48 +0100 | [diff] [blame] | 69 | #define EC_SPI_RECOVERY_TIME_NS (200 * 1000) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 70 | |
| 71 | /** |
| 72 | * struct cros_ec_spi - information about a SPI-connected EC |
| 73 | * |
| 74 | * @spi: SPI device we are connected to |
Jon Hunter | d501ff9 | 2017-11-14 14:43:28 +0000 | [diff] [blame] | 75 | * @last_transfer_ns: time that we last finished a transfer. |
Alexandru M Stan | ff4378f | 2015-06-09 13:04:49 +0200 | [diff] [blame] | 76 | * @start_of_msg_delay: used to set the delay_usecs on the spi_transfer that |
| 77 | * is sent when we want to turn on CS at the start of a transaction. |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 78 | * @end_of_msg_delay: used to set the delay_usecs on the spi_transfer that |
| 79 | * is sent when we want to turn off CS at the end of a transaction. |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 80 | */ |
| 81 | struct cros_ec_spi { |
| 82 | struct spi_device *spi; |
| 83 | s64 last_transfer_ns; |
Alexandru M Stan | ff4378f | 2015-06-09 13:04:49 +0200 | [diff] [blame] | 84 | unsigned int start_of_msg_delay; |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 85 | unsigned int end_of_msg_delay; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | static void debug_packet(struct device *dev, const char *name, u8 *ptr, |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 89 | int len) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 90 | { |
| 91 | #ifdef DEBUG |
| 92 | int i; |
| 93 | |
| 94 | dev_dbg(dev, "%s: ", name); |
| 95 | for (i = 0; i < len; i++) |
Thierry Reding | 9e146f4 | 2013-11-18 11:30:49 +0100 | [diff] [blame] | 96 | pr_cont(" %02x", ptr[i]); |
| 97 | |
| 98 | pr_cont("\n"); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 99 | #endif |
| 100 | } |
| 101 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 102 | static int terminate_request(struct cros_ec_device *ec_dev) |
| 103 | { |
| 104 | struct cros_ec_spi *ec_spi = ec_dev->priv; |
| 105 | struct spi_message msg; |
| 106 | struct spi_transfer trans; |
| 107 | int ret; |
| 108 | |
| 109 | /* |
| 110 | * Turn off CS, possibly adding a delay to ensure the rising edge |
| 111 | * doesn't come too soon after the end of the data. |
| 112 | */ |
| 113 | spi_message_init(&msg); |
| 114 | memset(&trans, 0, sizeof(trans)); |
| 115 | trans.delay_usecs = ec_spi->end_of_msg_delay; |
| 116 | spi_message_add_tail(&trans, &msg); |
| 117 | |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 118 | ret = spi_sync_locked(ec_spi->spi, &msg); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 119 | |
| 120 | /* Reset end-of-response timer */ |
| 121 | ec_spi->last_transfer_ns = ktime_get_ns(); |
| 122 | if (ret < 0) { |
| 123 | dev_err(ec_dev->dev, |
| 124 | "cs-deassert spi transfer failed: %d\n", |
| 125 | ret); |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * receive_n_bytes - receive n bytes from the EC. |
| 133 | * |
| 134 | * Assumes buf is a pointer into the ec_dev->din buffer |
| 135 | */ |
| 136 | static int receive_n_bytes(struct cros_ec_device *ec_dev, u8 *buf, int n) |
| 137 | { |
| 138 | struct cros_ec_spi *ec_spi = ec_dev->priv; |
| 139 | struct spi_transfer trans; |
| 140 | struct spi_message msg; |
| 141 | int ret; |
| 142 | |
| 143 | BUG_ON(buf - ec_dev->din + n > ec_dev->din_size); |
| 144 | |
| 145 | memset(&trans, 0, sizeof(trans)); |
| 146 | trans.cs_change = 1; |
| 147 | trans.rx_buf = buf; |
| 148 | trans.len = n; |
| 149 | |
| 150 | spi_message_init(&msg); |
| 151 | spi_message_add_tail(&trans, &msg); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 152 | ret = spi_sync_locked(ec_spi->spi, &msg); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 153 | if (ret < 0) |
| 154 | dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * cros_ec_spi_receive_packet - Receive a packet from the EC. |
| 161 | * |
| 162 | * This function has two phases: reading the preamble bytes (since if we read |
| 163 | * data from the EC before it is ready to send, we just get preamble) and |
| 164 | * reading the actual message. |
| 165 | * |
| 166 | * The received data is placed into ec_dev->din. |
| 167 | * |
| 168 | * @ec_dev: ChromeOS EC device |
| 169 | * @need_len: Number of message bytes we need to read |
| 170 | */ |
| 171 | static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev, |
| 172 | int need_len) |
| 173 | { |
| 174 | struct ec_host_response *response; |
| 175 | u8 *ptr, *end; |
| 176 | int ret; |
| 177 | unsigned long deadline; |
| 178 | int todo; |
| 179 | |
Lee Jones | 8827a64 | 2015-10-28 16:42:45 +0000 | [diff] [blame] | 180 | BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 181 | |
| 182 | /* Receive data until we see the header byte */ |
| 183 | deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS); |
| 184 | while (true) { |
| 185 | unsigned long start_jiffies = jiffies; |
| 186 | |
| 187 | ret = receive_n_bytes(ec_dev, |
| 188 | ec_dev->din, |
| 189 | EC_MSG_PREAMBLE_COUNT); |
| 190 | if (ret < 0) |
| 191 | return ret; |
| 192 | |
| 193 | ptr = ec_dev->din; |
| 194 | for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) { |
| 195 | if (*ptr == EC_SPI_FRAME_START) { |
| 196 | dev_dbg(ec_dev->dev, "msg found at %zd\n", |
| 197 | ptr - ec_dev->din); |
| 198 | break; |
| 199 | } |
| 200 | } |
| 201 | if (ptr != end) |
| 202 | break; |
| 203 | |
| 204 | /* |
| 205 | * Use the time at the start of the loop as a timeout. This |
| 206 | * gives us one last shot at getting the transfer and is useful |
| 207 | * in case we got context switched out for a while. |
| 208 | */ |
| 209 | if (time_after(start_jiffies, deadline)) { |
| 210 | dev_warn(ec_dev->dev, "EC failed to respond in time\n"); |
| 211 | return -ETIMEDOUT; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * ptr now points to the header byte. Copy any valid data to the |
| 217 | * start of our buffer |
| 218 | */ |
| 219 | todo = end - ++ptr; |
| 220 | BUG_ON(todo < 0 || todo > ec_dev->din_size); |
| 221 | todo = min(todo, need_len); |
| 222 | memmove(ec_dev->din, ptr, todo); |
| 223 | ptr = ec_dev->din + todo; |
| 224 | dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n", |
| 225 | need_len, todo); |
| 226 | need_len -= todo; |
| 227 | |
| 228 | /* If the entire response struct wasn't read, get the rest of it. */ |
| 229 | if (todo < sizeof(*response)) { |
| 230 | ret = receive_n_bytes(ec_dev, ptr, sizeof(*response) - todo); |
| 231 | if (ret < 0) |
| 232 | return -EBADMSG; |
| 233 | ptr += (sizeof(*response) - todo); |
| 234 | todo = sizeof(*response); |
| 235 | } |
| 236 | |
| 237 | response = (struct ec_host_response *)ec_dev->din; |
| 238 | |
| 239 | /* Abort if data_len is too large. */ |
| 240 | if (response->data_len > ec_dev->din_size) |
| 241 | return -EMSGSIZE; |
| 242 | |
| 243 | /* Receive data until we have it all */ |
| 244 | while (need_len > 0) { |
| 245 | /* |
| 246 | * We can't support transfers larger than the SPI FIFO size |
| 247 | * unless we have DMA. We don't have DMA on the ISP SPI ports |
| 248 | * for Exynos. We need a way of asking SPI driver for |
| 249 | * maximum-supported transfer size. |
| 250 | */ |
| 251 | todo = min(need_len, 256); |
| 252 | dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n", |
| 253 | todo, need_len, ptr - ec_dev->din); |
| 254 | |
| 255 | ret = receive_n_bytes(ec_dev, ptr, todo); |
| 256 | if (ret < 0) |
| 257 | return ret; |
| 258 | |
| 259 | ptr += todo; |
| 260 | need_len -= todo; |
| 261 | } |
| 262 | |
| 263 | dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din); |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 268 | /** |
| 269 | * cros_ec_spi_receive_response - Receive a response from the EC. |
| 270 | * |
| 271 | * This function has two phases: reading the preamble bytes (since if we read |
| 272 | * data from the EC before it is ready to send, we just get preamble) and |
| 273 | * reading the actual message. |
| 274 | * |
| 275 | * The received data is placed into ec_dev->din. |
| 276 | * |
| 277 | * @ec_dev: ChromeOS EC device |
| 278 | * @need_len: Number of message bytes we need to read |
| 279 | */ |
| 280 | static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev, |
| 281 | int need_len) |
| 282 | { |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 283 | u8 *ptr, *end; |
| 284 | int ret; |
| 285 | unsigned long deadline; |
| 286 | int todo; |
| 287 | |
Lee Jones | 8827a64 | 2015-10-28 16:42:45 +0000 | [diff] [blame] | 288 | BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 289 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 290 | /* Receive data until we see the header byte */ |
| 291 | deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS); |
Doug Anderson | c9a81d6 | 2014-04-30 10:44:06 -0700 | [diff] [blame] | 292 | while (true) { |
| 293 | unsigned long start_jiffies = jiffies; |
| 294 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 295 | ret = receive_n_bytes(ec_dev, |
| 296 | ec_dev->din, |
| 297 | EC_MSG_PREAMBLE_COUNT); |
| 298 | if (ret < 0) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 299 | return ret; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 300 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 301 | ptr = ec_dev->din; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 302 | for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) { |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 303 | if (*ptr == EC_SPI_FRAME_START) { |
Geert Uytterhoeven | c34924b | 2013-05-08 23:37:45 +0200 | [diff] [blame] | 304 | dev_dbg(ec_dev->dev, "msg found at %zd\n", |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 305 | ptr - ec_dev->din); |
| 306 | break; |
| 307 | } |
| 308 | } |
Doug Anderson | c9a81d6 | 2014-04-30 10:44:06 -0700 | [diff] [blame] | 309 | if (ptr != end) |
| 310 | break; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 311 | |
Doug Anderson | c9a81d6 | 2014-04-30 10:44:06 -0700 | [diff] [blame] | 312 | /* |
| 313 | * Use the time at the start of the loop as a timeout. This |
| 314 | * gives us one last shot at getting the transfer and is useful |
| 315 | * in case we got context switched out for a while. |
| 316 | */ |
| 317 | if (time_after(start_jiffies, deadline)) { |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 318 | dev_warn(ec_dev->dev, "EC failed to respond in time\n"); |
| 319 | return -ETIMEDOUT; |
| 320 | } |
Doug Anderson | c9a81d6 | 2014-04-30 10:44:06 -0700 | [diff] [blame] | 321 | } |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 322 | |
| 323 | /* |
| 324 | * ptr now points to the header byte. Copy any valid data to the |
| 325 | * start of our buffer |
| 326 | */ |
| 327 | todo = end - ++ptr; |
| 328 | BUG_ON(todo < 0 || todo > ec_dev->din_size); |
| 329 | todo = min(todo, need_len); |
| 330 | memmove(ec_dev->din, ptr, todo); |
| 331 | ptr = ec_dev->din + todo; |
| 332 | dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n", |
| 333 | need_len, todo); |
| 334 | need_len -= todo; |
| 335 | |
| 336 | /* Receive data until we have it all */ |
| 337 | while (need_len > 0) { |
| 338 | /* |
| 339 | * We can't support transfers larger than the SPI FIFO size |
| 340 | * unless we have DMA. We don't have DMA on the ISP SPI ports |
| 341 | * for Exynos. We need a way of asking SPI driver for |
| 342 | * maximum-supported transfer size. |
| 343 | */ |
| 344 | todo = min(need_len, 256); |
Geert Uytterhoeven | c34924b | 2013-05-08 23:37:45 +0200 | [diff] [blame] | 345 | dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n", |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 346 | todo, need_len, ptr - ec_dev->din); |
| 347 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 348 | ret = receive_n_bytes(ec_dev, ptr, todo); |
| 349 | if (ret < 0) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 350 | return ret; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 351 | |
| 352 | debug_packet(ec_dev->dev, "interim", ptr, todo); |
| 353 | ptr += todo; |
| 354 | need_len -= todo; |
| 355 | } |
| 356 | |
Geert Uytterhoeven | c34924b | 2013-05-08 23:37:45 +0200 | [diff] [blame] | 357 | dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 358 | |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | /** |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 363 | * cros_ec_pkt_xfer_spi - Transfer a packet over SPI and receive the reply |
| 364 | * |
| 365 | * @ec_dev: ChromeOS EC device |
| 366 | * @ec_msg: Message to transfer |
| 367 | */ |
| 368 | static int cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev, |
| 369 | struct cros_ec_command *ec_msg) |
| 370 | { |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 371 | struct ec_host_response *response; |
| 372 | struct cros_ec_spi *ec_spi = ec_dev->priv; |
Alexandru M Stan | ff4378f | 2015-06-09 13:04:49 +0200 | [diff] [blame] | 373 | struct spi_transfer trans, trans_delay; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 374 | struct spi_message msg; |
| 375 | int i, len; |
| 376 | u8 *ptr; |
| 377 | u8 *rx_buf; |
| 378 | u8 sum; |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 379 | u8 rx_byte; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 380 | int ret = 0, final_ret; |
Jon Hunter | d501ff9 | 2017-11-14 14:43:28 +0000 | [diff] [blame] | 381 | unsigned long delay; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 382 | |
| 383 | len = cros_ec_prepare_tx(ec_dev, ec_msg); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 384 | dev_dbg(ec_dev->dev, "prepared, len=%d\n", len); |
| 385 | |
| 386 | /* If it's too soon to do another transaction, wait */ |
Jon Hunter | d501ff9 | 2017-11-14 14:43:28 +0000 | [diff] [blame] | 387 | delay = ktime_get_ns() - ec_spi->last_transfer_ns; |
| 388 | if (delay < EC_SPI_RECOVERY_TIME_NS) |
| 389 | ndelay(EC_SPI_RECOVERY_TIME_NS - delay); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 390 | |
| 391 | rx_buf = kzalloc(len, GFP_KERNEL); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 392 | if (!rx_buf) |
| 393 | return -ENOMEM; |
| 394 | |
| 395 | spi_bus_lock(ec_spi->spi->master); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 396 | |
Alexandru M Stan | ff4378f | 2015-06-09 13:04:49 +0200 | [diff] [blame] | 397 | /* |
| 398 | * Leave a gap between CS assertion and clocking of data to allow the |
| 399 | * EC time to wakeup. |
| 400 | */ |
| 401 | spi_message_init(&msg); |
| 402 | if (ec_spi->start_of_msg_delay) { |
| 403 | memset(&trans_delay, 0, sizeof(trans_delay)); |
| 404 | trans_delay.delay_usecs = ec_spi->start_of_msg_delay; |
| 405 | spi_message_add_tail(&trans_delay, &msg); |
| 406 | } |
| 407 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 408 | /* Transmit phase - send our message */ |
| 409 | memset(&trans, 0, sizeof(trans)); |
| 410 | trans.tx_buf = ec_dev->dout; |
| 411 | trans.rx_buf = rx_buf; |
| 412 | trans.len = len; |
| 413 | trans.cs_change = 1; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 414 | spi_message_add_tail(&trans, &msg); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 415 | ret = spi_sync_locked(ec_spi->spi, &msg); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 416 | |
| 417 | /* Get the response */ |
| 418 | if (!ret) { |
| 419 | /* Verify that EC can process command */ |
| 420 | for (i = 0; i < len; i++) { |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 421 | rx_byte = rx_buf[i]; |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 422 | /* |
| 423 | * Seeing the PAST_END, RX_BAD_DATA, or NOT_READY |
| 424 | * markers are all signs that the EC didn't fully |
| 425 | * receive our command. e.g., if the EC is flashing |
| 426 | * itself, it can't respond to any commands and instead |
| 427 | * clocks out EC_SPI_PAST_END from its SPI hardware |
| 428 | * buffer. Similar occurrences can happen if the AP is |
| 429 | * too slow to clock out data after asserting CS -- the |
| 430 | * EC will abort and fill its buffer with |
| 431 | * EC_SPI_RX_BAD_DATA. |
| 432 | * |
| 433 | * In all cases, these errors should be safe to retry. |
| 434 | * Report -EAGAIN and let the caller decide what to do |
| 435 | * about that. |
| 436 | */ |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 437 | if (rx_byte == EC_SPI_PAST_END || |
| 438 | rx_byte == EC_SPI_RX_BAD_DATA || |
| 439 | rx_byte == EC_SPI_NOT_READY) { |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 440 | ret = -EAGAIN; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 441 | break; |
| 442 | } |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 443 | } |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 444 | } |
| 445 | |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 446 | if (!ret) |
| 447 | ret = cros_ec_spi_receive_packet(ec_dev, |
| 448 | ec_msg->insize + sizeof(*response)); |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 449 | else if (ret != -EAGAIN) |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 450 | dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); |
| 451 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 452 | final_ret = terminate_request(ec_dev); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 453 | |
| 454 | spi_bus_unlock(ec_spi->spi->master); |
| 455 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 456 | if (!ret) |
| 457 | ret = final_ret; |
| 458 | if (ret < 0) |
| 459 | goto exit; |
| 460 | |
| 461 | ptr = ec_dev->din; |
| 462 | |
| 463 | /* check response error code */ |
| 464 | response = (struct ec_host_response *)ptr; |
| 465 | ec_msg->result = response->result; |
| 466 | |
| 467 | ret = cros_ec_check_result(ec_dev, ec_msg); |
| 468 | if (ret) |
| 469 | goto exit; |
| 470 | |
| 471 | len = response->data_len; |
| 472 | sum = 0; |
| 473 | if (len > ec_msg->insize) { |
| 474 | dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", |
| 475 | len, ec_msg->insize); |
| 476 | ret = -EMSGSIZE; |
| 477 | goto exit; |
| 478 | } |
| 479 | |
| 480 | for (i = 0; i < sizeof(*response); i++) |
| 481 | sum += ptr[i]; |
| 482 | |
| 483 | /* copy response packet payload and compute checksum */ |
| 484 | memcpy(ec_msg->data, ptr + sizeof(*response), len); |
| 485 | for (i = 0; i < len; i++) |
| 486 | sum += ec_msg->data[i]; |
| 487 | |
| 488 | if (sum) { |
| 489 | dev_err(ec_dev->dev, |
| 490 | "bad packet checksum, calculated %x\n", |
| 491 | sum); |
| 492 | ret = -EBADMSG; |
| 493 | goto exit; |
| 494 | } |
| 495 | |
| 496 | ret = len; |
| 497 | exit: |
| 498 | kfree(rx_buf); |
| 499 | if (ec_msg->command == EC_CMD_REBOOT_EC) |
| 500 | msleep(EC_REBOOT_DELAY_MS); |
| 501 | |
| 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | /** |
Bill Richardson | 7e6cb5b | 2014-06-18 11:14:00 -0700 | [diff] [blame] | 506 | * cros_ec_cmd_xfer_spi - Transfer a message over SPI and receive the reply |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 507 | * |
| 508 | * @ec_dev: ChromeOS EC device |
| 509 | * @ec_msg: Message to transfer |
| 510 | */ |
Bill Richardson | 7e6cb5b | 2014-06-18 11:14:00 -0700 | [diff] [blame] | 511 | static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev, |
Bill Richardson | 5d4773e | 2014-06-18 11:14:02 -0700 | [diff] [blame] | 512 | struct cros_ec_command *ec_msg) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 513 | { |
| 514 | struct cros_ec_spi *ec_spi = ec_dev->priv; |
| 515 | struct spi_transfer trans; |
| 516 | struct spi_message msg; |
| 517 | int i, len; |
| 518 | u8 *ptr; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 519 | u8 *rx_buf; |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 520 | u8 rx_byte; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 521 | int sum; |
| 522 | int ret = 0, final_ret; |
Jon Hunter | d501ff9 | 2017-11-14 14:43:28 +0000 | [diff] [blame] | 523 | unsigned long delay; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 524 | |
| 525 | len = cros_ec_prepare_tx(ec_dev, ec_msg); |
| 526 | dev_dbg(ec_dev->dev, "prepared, len=%d\n", len); |
| 527 | |
| 528 | /* If it's too soon to do another transaction, wait */ |
Jon Hunter | d501ff9 | 2017-11-14 14:43:28 +0000 | [diff] [blame] | 529 | delay = ktime_get_ns() - ec_spi->last_transfer_ns; |
| 530 | if (delay < EC_SPI_RECOVERY_TIME_NS) |
| 531 | ndelay(EC_SPI_RECOVERY_TIME_NS - delay); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 532 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 533 | rx_buf = kzalloc(len, GFP_KERNEL); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 534 | if (!rx_buf) |
| 535 | return -ENOMEM; |
| 536 | |
| 537 | spi_bus_lock(ec_spi->spi->master); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 538 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 539 | /* Transmit phase - send our message */ |
| 540 | debug_packet(ec_dev->dev, "out", ec_dev->dout, len); |
Thierry Reding | daf93d2 | 2013-12-09 12:36:10 +0100 | [diff] [blame] | 541 | memset(&trans, 0, sizeof(trans)); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 542 | trans.tx_buf = ec_dev->dout; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 543 | trans.rx_buf = rx_buf; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 544 | trans.len = len; |
| 545 | trans.cs_change = 1; |
| 546 | spi_message_init(&msg); |
| 547 | spi_message_add_tail(&trans, &msg); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 548 | ret = spi_sync_locked(ec_spi->spi, &msg); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 549 | |
| 550 | /* Get the response */ |
| 551 | if (!ret) { |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 552 | /* Verify that EC can process command */ |
| 553 | for (i = 0; i < len; i++) { |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 554 | rx_byte = rx_buf[i]; |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 555 | /* See comments in cros_ec_pkt_xfer_spi() */ |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 556 | if (rx_byte == EC_SPI_PAST_END || |
| 557 | rx_byte == EC_SPI_RX_BAD_DATA || |
| 558 | rx_byte == EC_SPI_NOT_READY) { |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 559 | ret = -EAGAIN; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 560 | break; |
| 561 | } |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 562 | } |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 563 | } |
| 564 | |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 565 | if (!ret) |
| 566 | ret = cros_ec_spi_receive_response(ec_dev, |
| 567 | ec_msg->insize + EC_MSG_TX_PROTO_BYTES); |
Brian Norris | 1179956 | 2018-05-22 17:23:10 -0700 | [diff] [blame] | 568 | else if (ret != -EAGAIN) |
Shawn Nematbakhsh | 001dde9 | 2017-09-27 14:35:27 -0700 | [diff] [blame] | 569 | dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); |
| 570 | |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 571 | final_ret = terminate_request(ec_dev); |
Nicolas Boichat | 6d6e44a | 2015-11-25 13:51:07 +0800 | [diff] [blame] | 572 | |
| 573 | spi_bus_unlock(ec_spi->spi->master); |
| 574 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 575 | if (!ret) |
| 576 | ret = final_ret; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 577 | if (ret < 0) |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 578 | goto exit; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 579 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 580 | ptr = ec_dev->din; |
Bill Richardson | 6db07b6 | 2014-06-18 11:14:05 -0700 | [diff] [blame] | 581 | |
| 582 | /* check response error code */ |
| 583 | ec_msg->result = ptr[0]; |
| 584 | ret = cros_ec_check_result(ec_dev, ec_msg); |
| 585 | if (ret) |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 586 | goto exit; |
Bill Richardson | 6db07b6 | 2014-06-18 11:14:05 -0700 | [diff] [blame] | 587 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 588 | len = ptr[1]; |
| 589 | sum = ptr[0] + ptr[1]; |
Bill Richardson | 5d4773e | 2014-06-18 11:14:02 -0700 | [diff] [blame] | 590 | if (len > ec_msg->insize) { |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 591 | dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", |
Bill Richardson | 5d4773e | 2014-06-18 11:14:02 -0700 | [diff] [blame] | 592 | len, ec_msg->insize); |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 593 | ret = -ENOSPC; |
| 594 | goto exit; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | /* copy response packet payload and compute checksum */ |
| 598 | for (i = 0; i < len; i++) { |
| 599 | sum += ptr[i + 2]; |
Bill Richardson | 5d4773e | 2014-06-18 11:14:02 -0700 | [diff] [blame] | 600 | if (ec_msg->insize) |
Javier Martinez Canillas | a841178 | 2015-06-09 13:04:42 +0200 | [diff] [blame] | 601 | ec_msg->data[i] = ptr[i + 2]; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 602 | } |
| 603 | sum &= 0xff; |
| 604 | |
| 605 | debug_packet(ec_dev->dev, "in", ptr, len + 3); |
| 606 | |
| 607 | if (sum != ptr[len + 2]) { |
| 608 | dev_err(ec_dev->dev, |
| 609 | "bad packet checksum, expected %02x, got %02x\n", |
| 610 | sum, ptr[len + 2]); |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 611 | ret = -EBADMSG; |
| 612 | goto exit; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 613 | } |
| 614 | |
Bill Richardson | 12ebc8a | 2014-06-18 11:14:06 -0700 | [diff] [blame] | 615 | ret = len; |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 616 | exit: |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 617 | kfree(rx_buf); |
Doug Anderson | 659e142 | 2014-09-18 17:18:54 +0200 | [diff] [blame] | 618 | if (ec_msg->command == EC_CMD_REBOOT_EC) |
| 619 | msleep(EC_REBOOT_DELAY_MS); |
| 620 | |
Doug Anderson | 362196e | 2014-04-30 10:44:05 -0700 | [diff] [blame] | 621 | return ret; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 624 | static void cros_ec_spi_dt_probe(struct cros_ec_spi *ec_spi, struct device *dev) |
| 625 | { |
| 626 | struct device_node *np = dev->of_node; |
| 627 | u32 val; |
| 628 | int ret; |
| 629 | |
Alexandru M Stan | ff4378f | 2015-06-09 13:04:49 +0200 | [diff] [blame] | 630 | ret = of_property_read_u32(np, "google,cros-ec-spi-pre-delay", &val); |
| 631 | if (!ret) |
| 632 | ec_spi->start_of_msg_delay = val; |
| 633 | |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 634 | ret = of_property_read_u32(np, "google,cros-ec-spi-msg-delay", &val); |
| 635 | if (!ret) |
| 636 | ec_spi->end_of_msg_delay = val; |
| 637 | } |
| 638 | |
Thierry Reding | 9922b41 | 2013-11-25 13:22:30 +0100 | [diff] [blame] | 639 | static int cros_ec_spi_probe(struct spi_device *spi) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 640 | { |
| 641 | struct device *dev = &spi->dev; |
| 642 | struct cros_ec_device *ec_dev; |
| 643 | struct cros_ec_spi *ec_spi; |
| 644 | int err; |
| 645 | |
| 646 | spi->bits_per_word = 8; |
| 647 | spi->mode = SPI_MODE_0; |
| 648 | err = spi_setup(spi); |
| 649 | if (err < 0) |
| 650 | return err; |
| 651 | |
| 652 | ec_spi = devm_kzalloc(dev, sizeof(*ec_spi), GFP_KERNEL); |
| 653 | if (ec_spi == NULL) |
| 654 | return -ENOMEM; |
| 655 | ec_spi->spi = spi; |
| 656 | ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); |
| 657 | if (!ec_dev) |
| 658 | return -ENOMEM; |
| 659 | |
Rhyland Klein | 01e73c8 | 2013-12-09 12:36:09 +0100 | [diff] [blame] | 660 | /* Check for any DT properties */ |
| 661 | cros_ec_spi_dt_probe(ec_spi, dev); |
| 662 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 663 | spi_set_drvdata(spi, ec_dev); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 664 | ec_dev->dev = dev; |
| 665 | ec_dev->priv = ec_spi; |
| 666 | ec_dev->irq = spi->irq; |
Bill Richardson | 7e6cb5b | 2014-06-18 11:14:00 -0700 | [diff] [blame] | 667 | ec_dev->cmd_xfer = cros_ec_cmd_xfer_spi; |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 668 | ec_dev->pkt_xfer = cros_ec_pkt_xfer_spi; |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 669 | ec_dev->phys_name = dev_name(&ec_spi->spi->dev); |
Stephen Barber | 2c7589a | 2015-06-09 13:04:45 +0200 | [diff] [blame] | 670 | ec_dev->din_size = EC_MSG_PREAMBLE_COUNT + |
| 671 | sizeof(struct ec_host_response) + |
| 672 | sizeof(struct ec_response_get_protocol_info); |
| 673 | ec_dev->dout_size = sizeof(struct ec_host_request); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 674 | |
Jon Hunter | 15d8374 | 2017-11-14 14:43:27 +0000 | [diff] [blame] | 675 | ec_spi->last_transfer_ns = ktime_get_ns(); |
Stephen Barber | d365407 | 2015-06-09 13:04:46 +0200 | [diff] [blame] | 676 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 677 | err = cros_ec_register(ec_dev); |
| 678 | if (err) { |
| 679 | dev_err(dev, "cannot register EC\n"); |
| 680 | return err; |
| 681 | } |
| 682 | |
Prathyush K | fb50497 | 2014-06-16 14:12:23 -0700 | [diff] [blame] | 683 | device_init_wakeup(&spi->dev, true); |
| 684 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 685 | return 0; |
| 686 | } |
| 687 | |
Thierry Reding | 9922b41 | 2013-11-25 13:22:30 +0100 | [diff] [blame] | 688 | static int cros_ec_spi_remove(struct spi_device *spi) |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 689 | { |
| 690 | struct cros_ec_device *ec_dev; |
| 691 | |
| 692 | ec_dev = spi_get_drvdata(spi); |
| 693 | cros_ec_remove(ec_dev); |
| 694 | |
| 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | #ifdef CONFIG_PM_SLEEP |
| 699 | static int cros_ec_spi_suspend(struct device *dev) |
| 700 | { |
| 701 | struct cros_ec_device *ec_dev = dev_get_drvdata(dev); |
| 702 | |
| 703 | return cros_ec_suspend(ec_dev); |
| 704 | } |
| 705 | |
| 706 | static int cros_ec_spi_resume(struct device *dev) |
| 707 | { |
| 708 | struct cros_ec_device *ec_dev = dev_get_drvdata(dev); |
| 709 | |
| 710 | return cros_ec_resume(ec_dev); |
| 711 | } |
| 712 | #endif |
| 713 | |
| 714 | static SIMPLE_DEV_PM_OPS(cros_ec_spi_pm_ops, cros_ec_spi_suspend, |
| 715 | cros_ec_spi_resume); |
| 716 | |
Javier Martinez Canillas | a78ea19 | 2015-08-20 09:07:22 +0200 | [diff] [blame] | 717 | static const struct of_device_id cros_ec_spi_of_match[] = { |
| 718 | { .compatible = "google,cros-ec-spi", }, |
| 719 | { /* sentinel */ }, |
| 720 | }; |
| 721 | MODULE_DEVICE_TABLE(of, cros_ec_spi_of_match); |
| 722 | |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 723 | static const struct spi_device_id cros_ec_spi_id[] = { |
| 724 | { "cros-ec-spi", 0 }, |
| 725 | { } |
| 726 | }; |
| 727 | MODULE_DEVICE_TABLE(spi, cros_ec_spi_id); |
| 728 | |
| 729 | static struct spi_driver cros_ec_driver_spi = { |
| 730 | .driver = { |
| 731 | .name = "cros-ec-spi", |
Javier Martinez Canillas | a78ea19 | 2015-08-20 09:07:22 +0200 | [diff] [blame] | 732 | .of_match_table = of_match_ptr(cros_ec_spi_of_match), |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 733 | .pm = &cros_ec_spi_pm_ops, |
| 734 | }, |
Thierry Reding | 9922b41 | 2013-11-25 13:22:30 +0100 | [diff] [blame] | 735 | .probe = cros_ec_spi_probe, |
| 736 | .remove = cros_ec_spi_remove, |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 737 | .id_table = cros_ec_spi_id, |
| 738 | }; |
| 739 | |
| 740 | module_spi_driver(cros_ec_driver_spi); |
| 741 | |
Thierry Reding | ea0f8b0 | 2013-12-09 11:05:38 +0100 | [diff] [blame] | 742 | MODULE_LICENSE("GPL v2"); |
Simon Glass | a17d94f | 2013-02-25 14:08:39 -0800 | [diff] [blame] | 743 | MODULE_DESCRIPTION("ChromeOS EC multi function device (SPI)"); |