1162c7d8cSMarc Dietrich /* 2162c7d8cSMarc Dietrich * NVEC: NVIDIA compliant embedded controller interface 3162c7d8cSMarc Dietrich * 4162c7d8cSMarc Dietrich * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> 5162c7d8cSMarc Dietrich * 6162c7d8cSMarc Dietrich * Authors: Pierre-Hugues Husson <phhusson@free.fr> 7162c7d8cSMarc Dietrich * Ilya Petrov <ilya.muromec@gmail.com> 8162c7d8cSMarc Dietrich * Marc Dietrich <marvin24@gmx.de> 9791c4a64SJulian Andres Klode * Julian Andres Klode <jak@jak-linux.org> 10162c7d8cSMarc Dietrich * 11162c7d8cSMarc Dietrich * This file is subject to the terms and conditions of the GNU General Public 12162c7d8cSMarc Dietrich * License. See the file "COPYING" in the main directory of this archive 13162c7d8cSMarc Dietrich * for more details. 14162c7d8cSMarc Dietrich * 1532890b98SMarc Dietrich */ 1632890b98SMarc Dietrich 17162c7d8cSMarc Dietrich /* #define DEBUG */ 18162c7d8cSMarc Dietrich 1932890b98SMarc Dietrich #include <asm/irq.h> 20162c7d8cSMarc Dietrich 210b1076c4SJulian Andres Klode #include <linux/atomic.h> 2232890b98SMarc Dietrich #include <linux/completion.h> 2332890b98SMarc Dietrich #include <linux/interrupt.h> 24162c7d8cSMarc Dietrich #include <linux/io.h> 2532890b98SMarc Dietrich #include <linux/irq.h> 2632890b98SMarc Dietrich #include <linux/slab.h> 2732890b98SMarc Dietrich #include <linux/gpio.h> 2832890b98SMarc Dietrich #include <linux/serio.h> 2932890b98SMarc Dietrich #include <linux/delay.h> 3032890b98SMarc Dietrich #include <linux/input.h> 3132890b98SMarc Dietrich #include <linux/workqueue.h> 3232890b98SMarc Dietrich #include <linux/clk.h> 33162c7d8cSMarc Dietrich 3432890b98SMarc Dietrich #include <linux/semaphore.h> 3532890b98SMarc Dietrich #include <linux/list.h> 3632890b98SMarc Dietrich #include <linux/notifier.h> 3732890b98SMarc Dietrich #include <linux/platform_device.h> 38f686e9afSMarc Dietrich #include <linux/mfd/core.h> 39162c7d8cSMarc Dietrich 40162c7d8cSMarc Dietrich #include <mach/iomap.h> 41162c7d8cSMarc Dietrich #include <mach/clk.h> 42162c7d8cSMarc Dietrich 4332890b98SMarc Dietrich #include "nvec.h" 4432890b98SMarc Dietrich 45162c7d8cSMarc Dietrich static const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 46162c7d8cSMarc Dietrich static const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 47162c7d8cSMarc Dietrich static const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 4832890b98SMarc Dietrich 4932890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 5032890b98SMarc Dietrich 51f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 52f686e9afSMarc Dietrich { 53f686e9afSMarc Dietrich .name = "nvec-kbd", 54f686e9afSMarc Dietrich .id = 1, 55f686e9afSMarc Dietrich }, 56f686e9afSMarc Dietrich { 57f686e9afSMarc Dietrich .name = "nvec-mouse", 58f686e9afSMarc Dietrich .id = 1, 59f686e9afSMarc Dietrich }, 60f686e9afSMarc Dietrich { 61f686e9afSMarc Dietrich .name = "nvec-power", 62f686e9afSMarc Dietrich .id = 1, 63f686e9afSMarc Dietrich }, 64f686e9afSMarc Dietrich { 65f686e9afSMarc Dietrich .name = "nvec-power", 66f686e9afSMarc Dietrich .id = 2, 67f686e9afSMarc Dietrich }, 6897cc2657SIlya Petrov { 6997cc2657SIlya Petrov .name = "nvec-leds", 7097cc2657SIlya Petrov .id = 1, 7197cc2657SIlya Petrov }, 72f686e9afSMarc Dietrich }; 73f686e9afSMarc Dietrich 7432890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 7532890b98SMarc Dietrich unsigned int events) 7632890b98SMarc Dietrich { 7732890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 7832890b98SMarc Dietrich } 7932890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 8032890b98SMarc Dietrich 81162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 82162c7d8cSMarc Dietrich unsigned long event_type, void *data) 8332890b98SMarc Dietrich { 8432890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 8532890b98SMarc Dietrich 8632890b98SMarc Dietrich if (event_type != NVEC_CNTL) 8732890b98SMarc Dietrich return NOTIFY_DONE; 8832890b98SMarc Dietrich 89a3a9aa1aSMarc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 90a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 91a3a9aa1aSMarc Dietrich msg, msg[1] + 2, true); 9232890b98SMarc Dietrich 9332890b98SMarc Dietrich return NOTIFY_OK; 9432890b98SMarc Dietrich } 9532890b98SMarc Dietrich 960b1076c4SJulian Andres Klode static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec) 970b1076c4SJulian Andres Klode { 980b1076c4SJulian Andres Klode int i; 990b1076c4SJulian Andres Klode 1000b1076c4SJulian Andres Klode for (i = 0; i < NVEC_POOL_SIZE; i++) { 1010b1076c4SJulian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1020b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1030b1076c4SJulian Andres Klode return &nvec->msg_pool[i]; 1040b1076c4SJulian Andres Klode } 1050b1076c4SJulian Andres Klode } 1060b1076c4SJulian Andres Klode 1070b1076c4SJulian Andres Klode dev_err(nvec->dev, "could not allocate buffer\n"); 1080b1076c4SJulian Andres Klode 1090b1076c4SJulian Andres Klode return NULL; 1100b1076c4SJulian Andres Klode } 1110b1076c4SJulian Andres Klode 1120b1076c4SJulian Andres Klode static void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1130b1076c4SJulian Andres Klode { 1147b770657SJulian Andres Klode if (msg != &nvec->tx_scratch) 1150b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1160b1076c4SJulian Andres Klode atomic_set(&msg->used, 0); 1170b1076c4SJulian Andres Klode } 1180b1076c4SJulian Andres Klode 1198517e879SJulian Andres Klode /** 1208517e879SJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1218517e879SJulian Andres Klode * @msg: A message 1228517e879SJulian Andres Klode */ 1238517e879SJulian Andres Klode static bool nvec_msg_is_event(struct nvec_msg *msg) 1248517e879SJulian Andres Klode { 1258517e879SJulian Andres Klode return msg->data[0] >> 7; 1268517e879SJulian Andres Klode } 1278517e879SJulian Andres Klode 1288517e879SJulian Andres Klode /** 1298517e879SJulian Andres Klode * nvec_msg_size - Get the size of a message 1308517e879SJulian Andres Klode * @msg: The message to get the size for 1318517e879SJulian Andres Klode * 1328517e879SJulian Andres Klode * This only works for received messages, not for outgoing messages. 1338517e879SJulian Andres Klode */ 1348517e879SJulian Andres Klode static size_t nvec_msg_size(struct nvec_msg *msg) 1358517e879SJulian Andres Klode { 1368517e879SJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 1378517e879SJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 1388517e879SJulian Andres Klode 1398517e879SJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 1408517e879SJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 1418517e879SJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 1428517e879SJulian Andres Klode else if (event_length == NVEC_2BYTES) 1438517e879SJulian Andres Klode return 2; 1448517e879SJulian Andres Klode else if (event_length == NVEC_3BYTES) 1458517e879SJulian Andres Klode return 3; 1468517e879SJulian Andres Klode else 1478517e879SJulian Andres Klode return 0; 1488517e879SJulian Andres Klode } 1498517e879SJulian Andres Klode 150e7c40851SJulian Andres Klode static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 151e7c40851SJulian Andres Klode { 152e7c40851SJulian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 153e7c40851SJulian Andres Klode gpio_get_value(nvec->gpio), value); 154e7c40851SJulian Andres Klode gpio_set_value(nvec->gpio, value); 155e7c40851SJulian Andres Klode } 156e7c40851SJulian Andres Klode 157162c7d8cSMarc Dietrich void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 158162c7d8cSMarc Dietrich short size) 15932890b98SMarc Dietrich { 1600cab4cb8SJulian Andres Klode struct nvec_msg *msg; 1610cab4cb8SJulian Andres Klode unsigned long flags; 16232890b98SMarc Dietrich 1630cab4cb8SJulian Andres Klode msg = nvec_msg_alloc(nvec); 16432890b98SMarc Dietrich msg->data[0] = size; 16532890b98SMarc Dietrich memcpy(msg->data + 1, data, size); 16632890b98SMarc Dietrich msg->size = size + 1; 16732890b98SMarc Dietrich 1680cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 16932890b98SMarc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 1700cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 17132890b98SMarc Dietrich 1720cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->tx_work); 17332890b98SMarc Dietrich } 17432890b98SMarc Dietrich EXPORT_SYMBOL(nvec_write_async); 17532890b98SMarc Dietrich 1760cab4cb8SJulian Andres Klode struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 1770cab4cb8SJulian Andres Klode const unsigned char *data, short size) 1780cab4cb8SJulian Andres Klode { 1790cab4cb8SJulian Andres Klode struct nvec_msg *msg; 1800cab4cb8SJulian Andres Klode 1810cab4cb8SJulian Andres Klode mutex_lock(&nvec->sync_write_mutex); 1820cab4cb8SJulian Andres Klode 1830cab4cb8SJulian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 1840cab4cb8SJulian Andres Klode nvec_write_async(nvec, data, size); 1850cab4cb8SJulian Andres Klode 1860cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 1870cab4cb8SJulian Andres Klode nvec->sync_write_pending); 1880cab4cb8SJulian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 1890cab4cb8SJulian Andres Klode msecs_to_jiffies(2000)))) { 1900cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 1910cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 1920cab4cb8SJulian Andres Klode return NULL; 1930cab4cb8SJulian Andres Klode } 1940cab4cb8SJulian Andres Klode 1950cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 1960cab4cb8SJulian Andres Klode 1970cab4cb8SJulian Andres Klode msg = nvec->last_sync_msg; 1980cab4cb8SJulian Andres Klode 1990cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 2000cab4cb8SJulian Andres Klode 2010cab4cb8SJulian Andres Klode return msg; 2020cab4cb8SJulian Andres Klode } 2030cab4cb8SJulian Andres Klode EXPORT_SYMBOL(nvec_write_sync); 2040cab4cb8SJulian Andres Klode 2050cab4cb8SJulian Andres Klode /* TX worker */ 20632890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 20732890b98SMarc Dietrich { 20832890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 2090cab4cb8SJulian Andres Klode unsigned long flags; 2100cab4cb8SJulian Andres Klode long err; 2110cab4cb8SJulian Andres Klode struct nvec_msg *msg; 21232890b98SMarc Dietrich 2130cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 2140cab4cb8SJulian Andres Klode while (!list_empty(&nvec->tx_data)) { 2150cab4cb8SJulian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 2160cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 2170cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 2180cab4cb8SJulian Andres Klode err = wait_for_completion_interruptible_timeout( 2190cab4cb8SJulian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 2200cab4cb8SJulian Andres Klode 2210cab4cb8SJulian Andres Klode if (err == 0) { 2220cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 2230cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 2240cab4cb8SJulian Andres Klode msg->pos = 0; 2250cab4cb8SJulian Andres Klode } 2260cab4cb8SJulian Andres Klode 2270cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 2280cab4cb8SJulian Andres Klode 2290cab4cb8SJulian Andres Klode if (err > 0) { 2300cab4cb8SJulian Andres Klode list_del_init(&msg->node); 2310cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 2320cab4cb8SJulian Andres Klode } 2330cab4cb8SJulian Andres Klode } 2340cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 23532890b98SMarc Dietrich } 23632890b98SMarc Dietrich 23732890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 23832890b98SMarc Dietrich { 23932890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 240162c7d8cSMarc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 241162c7d8cSMarc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 24232890b98SMarc Dietrich return -EINVAL; 24332890b98SMarc Dietrich } 24432890b98SMarc Dietrich 245a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 246a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 247a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 248a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 24932890b98SMarc Dietrich 250162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 251162c7d8cSMarc Dietrich msg->data); 25232890b98SMarc Dietrich 25332890b98SMarc Dietrich return 0; 25432890b98SMarc Dietrich } 25532890b98SMarc Dietrich 25632890b98SMarc Dietrich /* RX worker */ 25732890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 25832890b98SMarc Dietrich { 25932890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 2600cab4cb8SJulian Andres Klode unsigned long flags; 26132890b98SMarc Dietrich struct nvec_msg *msg; 26232890b98SMarc Dietrich 2630cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 264162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 26532890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 26632890b98SMarc Dietrich list_del_init(&msg->node); 2670cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 26832890b98SMarc Dietrich 269162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 270162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 27132890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 27232890b98SMarc Dietrich nvec->sync_write_pending = 0; 27332890b98SMarc Dietrich nvec->last_sync_msg = msg; 27432890b98SMarc Dietrich complete(&nvec->sync_write); 27532890b98SMarc Dietrich } else { 27632890b98SMarc Dietrich parse_msg(nvec, msg); 2770cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 27832890b98SMarc Dietrich } 2790cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 28032890b98SMarc Dietrich } 2810cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 2820cab4cb8SJulian Andres Klode } 2830cab4cb8SJulian Andres Klode 2840cab4cb8SJulian Andres Klode static void nvec_tx_completed(struct nvec_chip *nvec) 2850cab4cb8SJulian Andres Klode { 2860cab4cb8SJulian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 2870cab4cb8SJulian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 2880cab4cb8SJulian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 2890cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 2900cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 2910cab4cb8SJulian Andres Klode } else { 2920cab4cb8SJulian Andres Klode nvec->state = 0; 29332890b98SMarc Dietrich } 29432890b98SMarc Dietrich } 29532890b98SMarc Dietrich 2960cab4cb8SJulian Andres Klode static void nvec_rx_completed(struct nvec_chip *nvec) 2970cab4cb8SJulian Andres Klode { 2980cab4cb8SJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) 2990cab4cb8SJulian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 3000cab4cb8SJulian Andres Klode (uint) nvec_msg_size(nvec->rx), 3010cab4cb8SJulian Andres Klode (uint) nvec->rx->pos); 3020cab4cb8SJulian Andres Klode 3030cab4cb8SJulian Andres Klode spin_lock(&nvec->rx_lock); 3040cab4cb8SJulian Andres Klode 3050cab4cb8SJulian Andres Klode /* add the received data to the work list 3060cab4cb8SJulian Andres Klode and move the ring buffer pointer to the next entry */ 3070cab4cb8SJulian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 3080cab4cb8SJulian Andres Klode 3090cab4cb8SJulian Andres Klode spin_unlock(&nvec->rx_lock); 3100cab4cb8SJulian Andres Klode 3110cab4cb8SJulian Andres Klode nvec->state = 0; 3120cab4cb8SJulian Andres Klode 3130cab4cb8SJulian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 3140cab4cb8SJulian Andres Klode complete(&nvec->ec_transfer); 3150cab4cb8SJulian Andres Klode 3160cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->rx_work); 3170cab4cb8SJulian Andres Klode } 3180cab4cb8SJulian Andres Klode 3190cab4cb8SJulian Andres Klode /** 3200cab4cb8SJulian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 3210cab4cb8SJulian Andres Klode * @nvec: The nvec device 3220cab4cb8SJulian Andres Klode * @status: The status flags 3230cab4cb8SJulian Andres Klode * @reset: Whether we shall jump to state 0. 3240cab4cb8SJulian Andres Klode */ 3250cab4cb8SJulian Andres Klode static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 3260cab4cb8SJulian Andres Klode bool reset) 3270cab4cb8SJulian Andres Klode { 3280cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 3290cab4cb8SJulian Andres Klode status, nvec->state); 3300cab4cb8SJulian Andres Klode if (reset) 3310cab4cb8SJulian Andres Klode nvec->state = 0; 3320cab4cb8SJulian Andres Klode } 3330cab4cb8SJulian Andres Klode 3340cab4cb8SJulian Andres Klode /** 3350cab4cb8SJulian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 3360cab4cb8SJulian Andres Klode */ 3370cab4cb8SJulian Andres Klode static void nvec_tx_set(struct nvec_chip *nvec) 3380cab4cb8SJulian Andres Klode { 3390cab4cb8SJulian Andres Klode spin_lock(&nvec->tx_lock); 3400cab4cb8SJulian Andres Klode if (list_empty(&nvec->tx_data)) { 3410cab4cb8SJulian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 3420cab4cb8SJulian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 3430cab4cb8SJulian Andres Klode nvec->tx_scratch.size = 3; 3440cab4cb8SJulian Andres Klode nvec->tx_scratch.pos = 0; 3450cab4cb8SJulian Andres Klode nvec->tx = &nvec->tx_scratch; 3460cab4cb8SJulian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 3470cab4cb8SJulian Andres Klode } else { 3480cab4cb8SJulian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 3490cab4cb8SJulian Andres Klode node); 3500cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 3510cab4cb8SJulian Andres Klode } 3520cab4cb8SJulian Andres Klode spin_unlock(&nvec->tx_lock); 3530cab4cb8SJulian Andres Klode 3540cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 3550cab4cb8SJulian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 3560cab4cb8SJulian Andres Klode } 3570cab4cb8SJulian Andres Klode 3580cab4cb8SJulian Andres Klode /** 3590cab4cb8SJulian Andres Klode * nvec_interrupt - Interrupt handler 3600cab4cb8SJulian Andres Klode * @irq: The IRQ 3610cab4cb8SJulian Andres Klode * @dev: The nvec device 3620cab4cb8SJulian Andres Klode */ 363f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 36432890b98SMarc Dietrich { 36532890b98SMarc Dietrich unsigned long status; 3660cab4cb8SJulian Andres Klode unsigned int received = 0; 3670cab4cb8SJulian Andres Klode unsigned char to_send = 0xff; 3680cab4cb8SJulian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 3690cab4cb8SJulian Andres Klode struct nvec_chip *nvec = dev; 3700cab4cb8SJulian Andres Klode unsigned int state = nvec->state; 37132890b98SMarc Dietrich 3720cab4cb8SJulian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 37332890b98SMarc Dietrich 3740cab4cb8SJulian Andres Klode /* Filter out some errors */ 3750cab4cb8SJulian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 3760cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 37732890b98SMarc Dietrich return IRQ_HANDLED; 3780cab4cb8SJulian Andres Klode } 3790cab4cb8SJulian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 3800cab4cb8SJulian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 3810cab4cb8SJulian Andres Klode return IRQ_HANDLED; 3820cab4cb8SJulian Andres Klode } 3830cab4cb8SJulian Andres Klode 3840cab4cb8SJulian Andres Klode /* The EC did not request a read, so it send us something, read it */ 3850cab4cb8SJulian Andres Klode if ((status & RNW) == 0) { 3860cab4cb8SJulian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 38732890b98SMarc Dietrich if (status & RCVD) 3880cab4cb8SJulian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 3890cab4cb8SJulian Andres Klode } 39032890b98SMarc Dietrich 3910cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 3920cab4cb8SJulian Andres Klode nvec->state = 0; 393162c7d8cSMarc Dietrich 3940cab4cb8SJulian Andres Klode switch (nvec->state) { 3950cab4cb8SJulian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 3960cab4cb8SJulian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 3970cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, false); 3980cab4cb8SJulian Andres Klode break; 3990cab4cb8SJulian Andres Klode case 1: /* command byte */ 4000cab4cb8SJulian Andres Klode if (status != I2C_SL_IRQ) { 4010cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 40232890b98SMarc Dietrich } else { 4030cab4cb8SJulian Andres Klode nvec->rx = nvec_msg_alloc(nvec); 4040cab4cb8SJulian Andres Klode nvec->rx->data[0] = received; 4050cab4cb8SJulian Andres Klode nvec->rx->pos = 1; 4060cab4cb8SJulian Andres Klode nvec->state = 2; 4070cab4cb8SJulian Andres Klode } 4080cab4cb8SJulian Andres Klode break; 4090cab4cb8SJulian Andres Klode case 2: /* first byte after command */ 4100cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 4110cab4cb8SJulian Andres Klode udelay(33); 4120cab4cb8SJulian Andres Klode if (nvec->rx->data[0] != 0x01) { 4130cab4cb8SJulian Andres Klode dev_err(nvec->dev, 4140cab4cb8SJulian Andres Klode "Read without prior read command\n"); 4150cab4cb8SJulian Andres Klode nvec->state = 0; 4160cab4cb8SJulian Andres Klode break; 4170cab4cb8SJulian Andres Klode } 4180cab4cb8SJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 4190cab4cb8SJulian Andres Klode nvec->state = 3; 4200cab4cb8SJulian Andres Klode nvec_tx_set(nvec); 4210cab4cb8SJulian Andres Klode BUG_ON(nvec->tx->size < 1); 4220cab4cb8SJulian Andres Klode to_send = nvec->tx->data[0]; 4230cab4cb8SJulian Andres Klode nvec->tx->pos = 1; 4240cab4cb8SJulian Andres Klode } else if (status == (I2C_SL_IRQ)) { 4250cab4cb8SJulian Andres Klode BUG_ON(nvec->rx == NULL); 4260cab4cb8SJulian Andres Klode nvec->rx->data[1] = received; 4270cab4cb8SJulian Andres Klode nvec->rx->pos = 2; 4280cab4cb8SJulian Andres Klode nvec->state = 4; 42932890b98SMarc Dietrich } else { 4300cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 43132890b98SMarc Dietrich } 4320cab4cb8SJulian Andres Klode break; 4330cab4cb8SJulian Andres Klode case 3: /* EC does a block read, we transmit data */ 4340cab4cb8SJulian Andres Klode if (status & END_TRANS) { 4350cab4cb8SJulian Andres Klode nvec_tx_completed(nvec); 4360cab4cb8SJulian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 4370cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 4380cab4cb8SJulian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 4390cab4cb8SJulian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 44032890b98SMarc Dietrich } else { 4410cab4cb8SJulian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 4420cab4cb8SJulian Andres Klode nvec->tx, 4430cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 4440cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 4450cab4cb8SJulian Andres Klode nvec->state = 0; 4460cab4cb8SJulian Andres Klode } 4470cab4cb8SJulian Andres Klode break; 4480cab4cb8SJulian Andres Klode case 4: /* EC does some write, we read the data */ 4490cab4cb8SJulian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 4500cab4cb8SJulian Andres Klode nvec_rx_completed(nvec); 4510cab4cb8SJulian Andres Klode else if (status & (RNW | RCVD)) 4520cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 4530cab4cb8SJulian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 4540cab4cb8SJulian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 4550cab4cb8SJulian Andres Klode else 4560cab4cb8SJulian Andres Klode dev_err(nvec->dev, 4570cab4cb8SJulian Andres Klode "RX buffer overflow on %p: " 4580cab4cb8SJulian Andres Klode "Trying to write byte %u of %u\n", 4590cab4cb8SJulian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 4600cab4cb8SJulian Andres Klode break; 4610cab4cb8SJulian Andres Klode default: 4620cab4cb8SJulian Andres Klode nvec->state = 0; 46332890b98SMarc Dietrich } 46432890b98SMarc Dietrich 4650cab4cb8SJulian Andres Klode /* If we are told that a new transfer starts, verify it */ 4660cab4cb8SJulian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 4670cab4cb8SJulian Andres Klode if (received != nvec->i2c_addr) 4680cab4cb8SJulian Andres Klode dev_err(nvec->dev, 4690cab4cb8SJulian Andres Klode "received address 0x%02x, expected 0x%02x\n", 4700cab4cb8SJulian Andres Klode received, nvec->i2c_addr); 4710cab4cb8SJulian Andres Klode nvec->state = 1; 47232890b98SMarc Dietrich } 4730cab4cb8SJulian Andres Klode 4740cab4cb8SJulian Andres Klode /* Send data if requested, but not on end of transmission */ 4750cab4cb8SJulian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 4760cab4cb8SJulian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 4770cab4cb8SJulian Andres Klode 4780cab4cb8SJulian Andres Klode /* If we have send the first byte */ 4790cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 4800cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 4810cab4cb8SJulian Andres Klode 4820cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, 4830cab4cb8SJulian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 4840cab4cb8SJulian Andres Klode (status & RNW) == 0 ? "received" : "R=", 4850cab4cb8SJulian Andres Klode received, 4860cab4cb8SJulian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 4870cab4cb8SJulian Andres Klode to_send, 4880cab4cb8SJulian Andres Klode state, 4890cab4cb8SJulian Andres Klode status & END_TRANS ? " END_TRANS" : "", 4900cab4cb8SJulian Andres Klode status & RCVD ? " RCVD" : "", 4910cab4cb8SJulian Andres Klode status & RNW ? " RNW" : ""); 4920cab4cb8SJulian Andres Klode 49332890b98SMarc Dietrich return IRQ_HANDLED; 49432890b98SMarc Dietrich } 49532890b98SMarc Dietrich 496f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 49732890b98SMarc Dietrich { 49832890b98SMarc Dietrich u32 val; 49932890b98SMarc Dietrich 500f686e9afSMarc Dietrich clk_enable(nvec->i2c_clk); 501f686e9afSMarc Dietrich 502f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 50332890b98SMarc Dietrich udelay(2); 504f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 50532890b98SMarc Dietrich 50632890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 50732890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 508f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 50932890b98SMarc Dietrich 510ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 511ac810759SMarc Dietrich 512ac810759SMarc Dietrich writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 513ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 514ac810759SMarc Dietrich 515ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 516ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 517ac810759SMarc Dietrich 518ac810759SMarc Dietrich enable_irq(nvec->irq); 519ac810759SMarc Dietrich 520ac810759SMarc Dietrich clk_disable(nvec->i2c_clk); 521ac810759SMarc Dietrich } 522ac810759SMarc Dietrich 523ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 524ac810759SMarc Dietrich { 525ac810759SMarc Dietrich disable_irq(nvec->irq); 526ac810759SMarc Dietrich writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 527f686e9afSMarc Dietrich clk_disable(nvec->i2c_clk); 52832890b98SMarc Dietrich } 52932890b98SMarc Dietrich 53032890b98SMarc Dietrich static void nvec_power_off(void) 53132890b98SMarc Dietrich { 53232890b98SMarc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 53332890b98SMarc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 53432890b98SMarc Dietrich } 53532890b98SMarc Dietrich 53632890b98SMarc Dietrich static int __devinit tegra_nvec_probe(struct platform_device *pdev) 53732890b98SMarc Dietrich { 538f686e9afSMarc Dietrich int err, ret; 53932890b98SMarc Dietrich struct clk *i2c_clk; 54032890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 54132890b98SMarc Dietrich struct nvec_chip *nvec; 54232890b98SMarc Dietrich struct nvec_msg *msg; 543f686e9afSMarc Dietrich struct resource *res; 544f686e9afSMarc Dietrich struct resource *iomem; 545f686e9afSMarc Dietrich void __iomem *base; 54632890b98SMarc Dietrich 54732890b98SMarc Dietrich nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 54832890b98SMarc Dietrich if (nvec == NULL) { 54932890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 55032890b98SMarc Dietrich return -ENOMEM; 55132890b98SMarc Dietrich } 55232890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 55332890b98SMarc Dietrich nvec->dev = &pdev->dev; 55432890b98SMarc Dietrich nvec->gpio = pdata->gpio; 555f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 55632890b98SMarc Dietrich 557f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 558f686e9afSMarc Dietrich if (!res) { 559f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 560f686e9afSMarc Dietrich return -ENODEV; 56132890b98SMarc Dietrich } 56232890b98SMarc Dietrich 563f686e9afSMarc Dietrich iomem = request_mem_region(res->start, resource_size(res), pdev->name); 564f686e9afSMarc Dietrich if (!iomem) { 565f686e9afSMarc Dietrich dev_err(&pdev->dev, "I2C region already claimed\n"); 566f686e9afSMarc Dietrich return -EBUSY; 56732890b98SMarc Dietrich } 56832890b98SMarc Dietrich 569f686e9afSMarc Dietrich base = ioremap(iomem->start, resource_size(iomem)); 570f686e9afSMarc Dietrich if (!base) { 571f686e9afSMarc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 572f686e9afSMarc Dietrich return -ENOMEM; 573f686e9afSMarc Dietrich } 57432890b98SMarc Dietrich 575f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 576f686e9afSMarc Dietrich if (!res) { 577f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 578f686e9afSMarc Dietrich ret = -ENODEV; 579f686e9afSMarc Dietrich goto err_iounmap; 580f686e9afSMarc Dietrich } 581f686e9afSMarc Dietrich 582f686e9afSMarc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 583f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 584f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 585f686e9afSMarc Dietrich goto err_iounmap; 58632890b98SMarc Dietrich } 58732890b98SMarc Dietrich 588f686e9afSMarc Dietrich nvec->base = base; 589f686e9afSMarc Dietrich nvec->irq = res->start; 590f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 5910cab4cb8SJulian Andres Klode nvec->rx = &nvec->msg_pool[0]; 592f686e9afSMarc Dietrich 59332890b98SMarc Dietrich /* Set the gpio to low when we've got something to say */ 59432890b98SMarc Dietrich err = gpio_request(nvec->gpio, "nvec gpio"); 59532890b98SMarc Dietrich if (err < 0) 59632890b98SMarc Dietrich dev_err(nvec->dev, "couldn't request gpio\n"); 59732890b98SMarc Dietrich 59832890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 59932890b98SMarc Dietrich 60032890b98SMarc Dietrich init_completion(&nvec->sync_write); 6010cab4cb8SJulian Andres Klode init_completion(&nvec->ec_transfer); 6020cab4cb8SJulian Andres Klode mutex_init(&nvec->sync_write_mutex); 6030cab4cb8SJulian Andres Klode spin_lock_init(&nvec->tx_lock); 6040cab4cb8SJulian Andres Klode spin_lock_init(&nvec->rx_lock); 60532890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 6060cab4cb8SJulian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 60732890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 60832890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 6090cab4cb8SJulian Andres Klode nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2); 61032890b98SMarc Dietrich 611f686e9afSMarc Dietrich err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 612f686e9afSMarc Dietrich if (err) { 613f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 614f686e9afSMarc Dietrich goto failed; 615f686e9afSMarc Dietrich } 616ac810759SMarc Dietrich disable_irq(nvec->irq); 617f686e9afSMarc Dietrich 618f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 619f686e9afSMarc Dietrich 620ac810759SMarc Dietrich clk_enable(i2c_clk); 621ac810759SMarc Dietrich 622f686e9afSMarc Dietrich gpio_direction_output(nvec->gpio, 1); 623f686e9afSMarc Dietrich gpio_set_value(nvec->gpio, 1); 624f686e9afSMarc Dietrich 62532890b98SMarc Dietrich /* enable event reporting */ 62632890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 62732890b98SMarc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 62832890b98SMarc Dietrich 62932890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 63032890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 63132890b98SMarc Dietrich 63232890b98SMarc Dietrich nvec_power_handle = nvec; 63332890b98SMarc Dietrich pm_power_off = nvec_power_off; 63432890b98SMarc Dietrich 63532890b98SMarc Dietrich /* Get Firmware Version */ 63632890b98SMarc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 63732890b98SMarc Dietrich sizeof(EC_GET_FIRMWARE_VERSION)); 63832890b98SMarc Dietrich 6390cab4cb8SJulian Andres Klode if (msg) { 64032890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 64132890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 64232890b98SMarc Dietrich 6430cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 6440cab4cb8SJulian Andres Klode } 64532890b98SMarc Dietrich 646f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 647f686e9afSMarc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 648f686e9afSMarc Dietrich if (ret) 649f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 650f686e9afSMarc Dietrich 65132890b98SMarc Dietrich /* unmute speakers? */ 6526dca320cSMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 65332890b98SMarc Dietrich 65432890b98SMarc Dietrich /* enable lid switch event */ 65532890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 65632890b98SMarc Dietrich 65732890b98SMarc Dietrich /* enable power button event */ 65832890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 65932890b98SMarc Dietrich 66032890b98SMarc Dietrich return 0; 66132890b98SMarc Dietrich 662f686e9afSMarc Dietrich err_iounmap: 663f686e9afSMarc Dietrich iounmap(base); 66432890b98SMarc Dietrich failed: 66532890b98SMarc Dietrich kfree(nvec); 66632890b98SMarc Dietrich return -ENOMEM; 66732890b98SMarc Dietrich } 66832890b98SMarc Dietrich 66932890b98SMarc Dietrich static int __devexit tegra_nvec_remove(struct platform_device *pdev) 67032890b98SMarc Dietrich { 671f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 672f686e9afSMarc Dietrich 673f686e9afSMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 674f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 675f686e9afSMarc Dietrich free_irq(nvec->irq, &nvec_interrupt); 676f686e9afSMarc Dietrich iounmap(nvec->base); 677f686e9afSMarc Dietrich gpio_free(nvec->gpio); 6780cab4cb8SJulian Andres Klode destroy_workqueue(nvec->wq); 679f686e9afSMarc Dietrich kfree(nvec); 680f686e9afSMarc Dietrich 68132890b98SMarc Dietrich return 0; 68232890b98SMarc Dietrich } 68332890b98SMarc Dietrich 68432890b98SMarc Dietrich #ifdef CONFIG_PM 68532890b98SMarc Dietrich 68632890b98SMarc Dietrich static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 68732890b98SMarc Dietrich { 68832890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 68932890b98SMarc Dietrich 69032890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 69132890b98SMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 69232890b98SMarc Dietrich nvec_write_async(nvec, "\x04\x02", 2); 693ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 69432890b98SMarc Dietrich 69532890b98SMarc Dietrich return 0; 69632890b98SMarc Dietrich } 69732890b98SMarc Dietrich 698162c7d8cSMarc Dietrich static int tegra_nvec_resume(struct platform_device *pdev) 699162c7d8cSMarc Dietrich { 70032890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 70132890b98SMarc Dietrich 70232890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 703f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 70432890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 70532890b98SMarc Dietrich 70632890b98SMarc Dietrich return 0; 70732890b98SMarc Dietrich } 70832890b98SMarc Dietrich 70932890b98SMarc Dietrich #else 71032890b98SMarc Dietrich #define tegra_nvec_suspend NULL 71132890b98SMarc Dietrich #define tegra_nvec_resume NULL 71232890b98SMarc Dietrich #endif 71332890b98SMarc Dietrich 714162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 71532890b98SMarc Dietrich .probe = tegra_nvec_probe, 71632890b98SMarc Dietrich .remove = __devexit_p(tegra_nvec_remove), 71732890b98SMarc Dietrich .suspend = tegra_nvec_suspend, 71832890b98SMarc Dietrich .resume = tegra_nvec_resume, 71932890b98SMarc Dietrich .driver = { 72032890b98SMarc Dietrich .name = "nvec", 72132890b98SMarc Dietrich .owner = THIS_MODULE, 72232890b98SMarc Dietrich } 72332890b98SMarc Dietrich }; 72432890b98SMarc Dietrich 72532890b98SMarc Dietrich static int __init tegra_nvec_init(void) 72632890b98SMarc Dietrich { 72732890b98SMarc Dietrich return platform_driver_register(&nvec_device_driver); 72832890b98SMarc Dietrich } 72932890b98SMarc Dietrich 73032890b98SMarc Dietrich module_init(tegra_nvec_init); 731162c7d8cSMarc Dietrich 73232890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 733162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 734162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 735162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 736