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> 9162c7d8cSMarc Dietrich * 10162c7d8cSMarc Dietrich * This file is subject to the terms and conditions of the GNU General Public 11162c7d8cSMarc Dietrich * License. See the file "COPYING" in the main directory of this archive 12162c7d8cSMarc Dietrich * for more details. 13162c7d8cSMarc Dietrich * 1432890b98SMarc Dietrich */ 1532890b98SMarc Dietrich 16162c7d8cSMarc Dietrich /* #define DEBUG */ 17162c7d8cSMarc Dietrich 1832890b98SMarc Dietrich #include <asm/irq.h> 19162c7d8cSMarc Dietrich 200b1076c4SJulian Andres Klode #include <linux/atomic.h> 2132890b98SMarc Dietrich #include <linux/completion.h> 2232890b98SMarc Dietrich #include <linux/interrupt.h> 23162c7d8cSMarc Dietrich #include <linux/io.h> 2432890b98SMarc Dietrich #include <linux/irq.h> 2532890b98SMarc Dietrich #include <linux/slab.h> 2632890b98SMarc Dietrich #include <linux/gpio.h> 2732890b98SMarc Dietrich #include <linux/serio.h> 2832890b98SMarc Dietrich #include <linux/delay.h> 2932890b98SMarc Dietrich #include <linux/input.h> 3032890b98SMarc Dietrich #include <linux/workqueue.h> 3132890b98SMarc Dietrich #include <linux/clk.h> 32162c7d8cSMarc Dietrich 3332890b98SMarc Dietrich #include <linux/semaphore.h> 3432890b98SMarc Dietrich #include <linux/list.h> 3532890b98SMarc Dietrich #include <linux/notifier.h> 3632890b98SMarc Dietrich #include <linux/platform_device.h> 37f686e9afSMarc Dietrich #include <linux/mfd/core.h> 38162c7d8cSMarc Dietrich 39162c7d8cSMarc Dietrich #include <mach/iomap.h> 40162c7d8cSMarc Dietrich #include <mach/clk.h> 41162c7d8cSMarc Dietrich 4232890b98SMarc Dietrich #include "nvec.h" 4332890b98SMarc Dietrich 44162c7d8cSMarc Dietrich static const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 45162c7d8cSMarc Dietrich static const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 46162c7d8cSMarc Dietrich static const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 4732890b98SMarc Dietrich 4832890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 4932890b98SMarc Dietrich 50f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 51f686e9afSMarc Dietrich { 52f686e9afSMarc Dietrich .name = "nvec-kbd", 53f686e9afSMarc Dietrich .id = 1, 54f686e9afSMarc Dietrich }, 55f686e9afSMarc Dietrich { 56f686e9afSMarc Dietrich .name = "nvec-mouse", 57f686e9afSMarc Dietrich .id = 1, 58f686e9afSMarc Dietrich }, 59f686e9afSMarc Dietrich { 60f686e9afSMarc Dietrich .name = "nvec-power", 61f686e9afSMarc Dietrich .id = 1, 62f686e9afSMarc Dietrich }, 63f686e9afSMarc Dietrich { 64f686e9afSMarc Dietrich .name = "nvec-power", 65f686e9afSMarc Dietrich .id = 2, 66f686e9afSMarc Dietrich }, 6797cc2657SIlya Petrov { 6897cc2657SIlya Petrov .name = "nvec-leds", 6997cc2657SIlya Petrov .id = 1, 7097cc2657SIlya Petrov }, 71f686e9afSMarc Dietrich }; 72f686e9afSMarc Dietrich 7332890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 7432890b98SMarc Dietrich unsigned int events) 7532890b98SMarc Dietrich { 7632890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 7732890b98SMarc Dietrich } 7832890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 7932890b98SMarc Dietrich 80162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 81162c7d8cSMarc Dietrich unsigned long event_type, void *data) 8232890b98SMarc Dietrich { 8332890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 8432890b98SMarc Dietrich 8532890b98SMarc Dietrich if (event_type != NVEC_CNTL) 8632890b98SMarc Dietrich return NOTIFY_DONE; 8732890b98SMarc Dietrich 88a3a9aa1aSMarc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 89a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 90a3a9aa1aSMarc Dietrich msg, msg[1] + 2, true); 9132890b98SMarc Dietrich 9232890b98SMarc Dietrich return NOTIFY_OK; 9332890b98SMarc Dietrich } 9432890b98SMarc Dietrich 950b1076c4SJulian Andres Klode static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec) 960b1076c4SJulian Andres Klode { 970b1076c4SJulian Andres Klode int i; 980b1076c4SJulian Andres Klode 990b1076c4SJulian Andres Klode for (i = 0; i < NVEC_POOL_SIZE; i++) { 1000b1076c4SJulian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1010b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1020b1076c4SJulian Andres Klode return &nvec->msg_pool[i]; 1030b1076c4SJulian Andres Klode } 1040b1076c4SJulian Andres Klode } 1050b1076c4SJulian Andres Klode 1060b1076c4SJulian Andres Klode dev_err(nvec->dev, "could not allocate buffer\n"); 1070b1076c4SJulian Andres Klode 1080b1076c4SJulian Andres Klode return NULL; 1090b1076c4SJulian Andres Klode } 1100b1076c4SJulian Andres Klode 1110b1076c4SJulian Andres Klode static void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1120b1076c4SJulian Andres Klode { 1130b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1140b1076c4SJulian Andres Klode atomic_set(&msg->used, 0); 1150b1076c4SJulian Andres Klode } 1160b1076c4SJulian Andres Klode 117e7c40851SJulian Andres Klode static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 118e7c40851SJulian Andres Klode { 119e7c40851SJulian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 120e7c40851SJulian Andres Klode gpio_get_value(nvec->gpio), value); 121e7c40851SJulian Andres Klode gpio_set_value(nvec->gpio, value); 122e7c40851SJulian Andres Klode } 123e7c40851SJulian Andres Klode 124162c7d8cSMarc Dietrich void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 125162c7d8cSMarc Dietrich short size) 12632890b98SMarc Dietrich { 12732890b98SMarc Dietrich struct nvec_msg *msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT); 12832890b98SMarc Dietrich 12932890b98SMarc Dietrich msg->data = kzalloc(size, GFP_NOWAIT); 13032890b98SMarc Dietrich msg->data[0] = size; 13132890b98SMarc Dietrich memcpy(msg->data + 1, data, size); 13232890b98SMarc Dietrich msg->size = size + 1; 13332890b98SMarc Dietrich msg->pos = 0; 13432890b98SMarc Dietrich INIT_LIST_HEAD(&msg->node); 13532890b98SMarc Dietrich 13632890b98SMarc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 13732890b98SMarc Dietrich 13832890b98SMarc Dietrich gpio_set_value(nvec->gpio, 0); 13932890b98SMarc Dietrich } 14032890b98SMarc Dietrich EXPORT_SYMBOL(nvec_write_async); 14132890b98SMarc Dietrich 14232890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 14332890b98SMarc Dietrich { 14432890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 14532890b98SMarc Dietrich 146162c7d8cSMarc Dietrich if (!list_empty(&nvec->tx_data)) 14732890b98SMarc Dietrich gpio_set_value(nvec->gpio, 0); 14832890b98SMarc Dietrich } 14932890b98SMarc Dietrich 15032890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 15132890b98SMarc Dietrich { 15232890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 153162c7d8cSMarc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 154162c7d8cSMarc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 15532890b98SMarc Dietrich return -EINVAL; 15632890b98SMarc Dietrich } 15732890b98SMarc Dietrich 158a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 159a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 160a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 161a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 16232890b98SMarc Dietrich 163162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 164162c7d8cSMarc Dietrich msg->data); 16532890b98SMarc Dietrich 16632890b98SMarc Dietrich return 0; 16732890b98SMarc Dietrich } 16832890b98SMarc Dietrich 169162c7d8cSMarc Dietrich static struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 170162c7d8cSMarc Dietrich const unsigned char *data, short size) 17132890b98SMarc Dietrich { 17232890b98SMarc Dietrich down(&nvec->sync_write_mutex); 17332890b98SMarc Dietrich 17432890b98SMarc Dietrich nvec->sync_write_pending = (data[1] << 8) + data[0]; 17532890b98SMarc Dietrich nvec_write_async(nvec, data, size); 17632890b98SMarc Dietrich 177162c7d8cSMarc Dietrich dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 178162c7d8cSMarc Dietrich nvec->sync_write_pending); 17932890b98SMarc Dietrich wait_for_completion(&nvec->sync_write); 18032890b98SMarc Dietrich dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 18132890b98SMarc Dietrich 18232890b98SMarc Dietrich up(&nvec->sync_write_mutex); 18332890b98SMarc Dietrich 18432890b98SMarc Dietrich return nvec->last_sync_msg; 18532890b98SMarc Dietrich } 18632890b98SMarc Dietrich 18732890b98SMarc Dietrich /* RX worker */ 18832890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 18932890b98SMarc Dietrich { 19032890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 19132890b98SMarc Dietrich struct nvec_msg *msg; 19232890b98SMarc Dietrich 193162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 19432890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 19532890b98SMarc Dietrich list_del_init(&msg->node); 19632890b98SMarc Dietrich 197162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 198162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 19932890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 20032890b98SMarc Dietrich nvec->sync_write_pending = 0; 20132890b98SMarc Dietrich nvec->last_sync_msg = msg; 20232890b98SMarc Dietrich complete(&nvec->sync_write); 20332890b98SMarc Dietrich } else { 20432890b98SMarc Dietrich parse_msg(nvec, msg); 20532890b98SMarc Dietrich if ((!msg) || (!msg->data)) 206162c7d8cSMarc Dietrich dev_warn(nvec->dev, 207162c7d8cSMarc Dietrich "attempt access zero pointer\n"); 20832890b98SMarc Dietrich else { 20932890b98SMarc Dietrich kfree(msg->data); 21032890b98SMarc Dietrich kfree(msg); 21132890b98SMarc Dietrich } 21232890b98SMarc Dietrich } 21332890b98SMarc Dietrich } 21432890b98SMarc Dietrich } 21532890b98SMarc Dietrich 216f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 21732890b98SMarc Dietrich { 21832890b98SMarc Dietrich unsigned long status; 21932890b98SMarc Dietrich unsigned long received; 22032890b98SMarc Dietrich unsigned char to_send; 22132890b98SMarc Dietrich struct nvec_msg *msg; 22232890b98SMarc Dietrich struct nvec_chip *nvec = (struct nvec_chip *)dev; 223f686e9afSMarc Dietrich void __iomem *base = nvec->base; 22432890b98SMarc Dietrich 225f686e9afSMarc Dietrich status = readl(base + I2C_SL_STATUS); 22632890b98SMarc Dietrich 227162c7d8cSMarc Dietrich if (!(status & I2C_SL_IRQ)) { 22832890b98SMarc Dietrich dev_warn(nvec->dev, "nvec Spurious IRQ\n"); 22932890b98SMarc Dietrich goto handled; 23032890b98SMarc Dietrich } 231162c7d8cSMarc Dietrich if (status & END_TRANS && !(status & RCVD)) { 23232890b98SMarc Dietrich nvec->state = NVEC_WAIT; 233162c7d8cSMarc Dietrich if (nvec->rx->size > 1) { 23432890b98SMarc Dietrich list_add_tail(&nvec->rx->node, &nvec->rx_data); 23532890b98SMarc Dietrich schedule_work(&nvec->rx_work); 23632890b98SMarc Dietrich } else { 23732890b98SMarc Dietrich kfree(nvec->rx->data); 23832890b98SMarc Dietrich kfree(nvec->rx); 23932890b98SMarc Dietrich } 24032890b98SMarc Dietrich return IRQ_HANDLED; 241162c7d8cSMarc Dietrich } else if (status & RNW) { 24232890b98SMarc Dietrich if (status & RCVD) 24332890b98SMarc Dietrich udelay(3); 24432890b98SMarc Dietrich 24532890b98SMarc Dietrich if (status & RCVD) 24632890b98SMarc Dietrich nvec->state = NVEC_WRITE; 247162c7d8cSMarc Dietrich 248162c7d8cSMarc Dietrich if (list_empty(&nvec->tx_data)) { 24932890b98SMarc Dietrich dev_err(nvec->dev, "nvec empty tx - sending no-op\n"); 25032890b98SMarc Dietrich to_send = 0x8a; 25132890b98SMarc Dietrich nvec_write_async(nvec, "\x07\x02", 2); 25232890b98SMarc Dietrich } else { 253162c7d8cSMarc Dietrich msg = 254162c7d8cSMarc Dietrich list_first_entry(&nvec->tx_data, struct nvec_msg, 255162c7d8cSMarc Dietrich node); 25632890b98SMarc Dietrich if (msg->pos < msg->size) { 25732890b98SMarc Dietrich to_send = msg->data[msg->pos]; 25832890b98SMarc Dietrich msg->pos++; 25932890b98SMarc Dietrich } else { 260162c7d8cSMarc Dietrich dev_err(nvec->dev, "nvec crap! %d\n", 261162c7d8cSMarc Dietrich msg->size); 26232890b98SMarc Dietrich to_send = 0x01; 26332890b98SMarc Dietrich } 26432890b98SMarc Dietrich 265162c7d8cSMarc Dietrich if (msg->pos >= msg->size) { 26632890b98SMarc Dietrich list_del_init(&msg->node); 26732890b98SMarc Dietrich kfree(msg->data); 26832890b98SMarc Dietrich kfree(msg); 26932890b98SMarc Dietrich schedule_work(&nvec->tx_work); 27032890b98SMarc Dietrich nvec->state = NVEC_WAIT; 27132890b98SMarc Dietrich } 27232890b98SMarc Dietrich } 273f686e9afSMarc Dietrich writel(to_send, base + I2C_SL_RCVD); 27432890b98SMarc Dietrich 27532890b98SMarc Dietrich gpio_set_value(nvec->gpio, 1); 27632890b98SMarc Dietrich 27732890b98SMarc Dietrich dev_dbg(nvec->dev, "nvec sent %x\n", to_send); 27832890b98SMarc Dietrich 27932890b98SMarc Dietrich goto handled; 28032890b98SMarc Dietrich } else { 281f686e9afSMarc Dietrich received = readl(base + I2C_SL_RCVD); 282162c7d8cSMarc Dietrich 28332890b98SMarc Dietrich if (status & RCVD) { 284f686e9afSMarc Dietrich writel(0, base + I2C_SL_RCVD); 28532890b98SMarc Dietrich goto handled; 28632890b98SMarc Dietrich } 28732890b98SMarc Dietrich 288162c7d8cSMarc Dietrich if (nvec->state == NVEC_WAIT) { 28932890b98SMarc Dietrich nvec->state = NVEC_READ; 29032890b98SMarc Dietrich msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT); 29132890b98SMarc Dietrich msg->data = kzalloc(32, GFP_NOWAIT); 29232890b98SMarc Dietrich INIT_LIST_HEAD(&msg->node); 29332890b98SMarc Dietrich nvec->rx = msg; 29432890b98SMarc Dietrich } else 29532890b98SMarc Dietrich msg = nvec->rx; 29632890b98SMarc Dietrich 29732890b98SMarc Dietrich BUG_ON(msg->pos > 32); 29832890b98SMarc Dietrich 29932890b98SMarc Dietrich msg->data[msg->pos] = received; 30032890b98SMarc Dietrich msg->pos++; 30132890b98SMarc Dietrich msg->size = msg->pos; 302162c7d8cSMarc Dietrich dev_dbg(nvec->dev, "Got %02lx from Master (pos: %d)!\n", 303162c7d8cSMarc Dietrich received, msg->pos); 30432890b98SMarc Dietrich } 30532890b98SMarc Dietrich handled: 30632890b98SMarc Dietrich return IRQ_HANDLED; 30732890b98SMarc Dietrich } 30832890b98SMarc Dietrich 309f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 31032890b98SMarc Dietrich { 31132890b98SMarc Dietrich u32 val; 31232890b98SMarc Dietrich 313f686e9afSMarc Dietrich clk_enable(nvec->i2c_clk); 314f686e9afSMarc Dietrich 315f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 31632890b98SMarc Dietrich udelay(2); 317f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 31832890b98SMarc Dietrich 31932890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 32032890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 321f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 32232890b98SMarc Dietrich 323ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 324ac810759SMarc Dietrich 325ac810759SMarc Dietrich writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 326ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 327ac810759SMarc Dietrich 328ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 329ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 330ac810759SMarc Dietrich 331ac810759SMarc Dietrich enable_irq(nvec->irq); 332ac810759SMarc Dietrich 333ac810759SMarc Dietrich clk_disable(nvec->i2c_clk); 334ac810759SMarc Dietrich } 335ac810759SMarc Dietrich 336ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 337ac810759SMarc Dietrich { 338ac810759SMarc Dietrich disable_irq(nvec->irq); 339ac810759SMarc Dietrich writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 340f686e9afSMarc Dietrich clk_disable(nvec->i2c_clk); 34132890b98SMarc Dietrich } 34232890b98SMarc Dietrich 34332890b98SMarc Dietrich static void nvec_power_off(void) 34432890b98SMarc Dietrich { 34532890b98SMarc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 34632890b98SMarc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 34732890b98SMarc Dietrich } 34832890b98SMarc Dietrich 34932890b98SMarc Dietrich static int __devinit tegra_nvec_probe(struct platform_device *pdev) 35032890b98SMarc Dietrich { 351f686e9afSMarc Dietrich int err, ret; 35232890b98SMarc Dietrich struct clk *i2c_clk; 35332890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 35432890b98SMarc Dietrich struct nvec_chip *nvec; 35532890b98SMarc Dietrich struct nvec_msg *msg; 356f686e9afSMarc Dietrich struct resource *res; 357f686e9afSMarc Dietrich struct resource *iomem; 358f686e9afSMarc Dietrich void __iomem *base; 35932890b98SMarc Dietrich 36032890b98SMarc Dietrich nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 36132890b98SMarc Dietrich if (nvec == NULL) { 36232890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 36332890b98SMarc Dietrich return -ENOMEM; 36432890b98SMarc Dietrich } 36532890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 36632890b98SMarc Dietrich nvec->dev = &pdev->dev; 36732890b98SMarc Dietrich nvec->gpio = pdata->gpio; 368f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 36932890b98SMarc Dietrich 370f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 371f686e9afSMarc Dietrich if (!res) { 372f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 373f686e9afSMarc Dietrich return -ENODEV; 37432890b98SMarc Dietrich } 37532890b98SMarc Dietrich 376f686e9afSMarc Dietrich iomem = request_mem_region(res->start, resource_size(res), pdev->name); 377f686e9afSMarc Dietrich if (!iomem) { 378f686e9afSMarc Dietrich dev_err(&pdev->dev, "I2C region already claimed\n"); 379f686e9afSMarc Dietrich return -EBUSY; 38032890b98SMarc Dietrich } 38132890b98SMarc Dietrich 382f686e9afSMarc Dietrich base = ioremap(iomem->start, resource_size(iomem)); 383f686e9afSMarc Dietrich if (!base) { 384f686e9afSMarc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 385f686e9afSMarc Dietrich return -ENOMEM; 386f686e9afSMarc Dietrich } 38732890b98SMarc Dietrich 388f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 389f686e9afSMarc Dietrich if (!res) { 390f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 391f686e9afSMarc Dietrich ret = -ENODEV; 392f686e9afSMarc Dietrich goto err_iounmap; 393f686e9afSMarc Dietrich } 394f686e9afSMarc Dietrich 395f686e9afSMarc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 396f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 397f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 398f686e9afSMarc Dietrich goto err_iounmap; 39932890b98SMarc Dietrich } 40032890b98SMarc Dietrich 401f686e9afSMarc Dietrich nvec->base = base; 402f686e9afSMarc Dietrich nvec->irq = res->start; 403f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 404f686e9afSMarc Dietrich 40532890b98SMarc Dietrich /* Set the gpio to low when we've got something to say */ 40632890b98SMarc Dietrich err = gpio_request(nvec->gpio, "nvec gpio"); 40732890b98SMarc Dietrich if (err < 0) 40832890b98SMarc Dietrich dev_err(nvec->dev, "couldn't request gpio\n"); 40932890b98SMarc Dietrich 41032890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 41132890b98SMarc Dietrich 41232890b98SMarc Dietrich init_completion(&nvec->sync_write); 41332890b98SMarc Dietrich sema_init(&nvec->sync_write_mutex, 1); 41432890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->tx_data); 41532890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 41632890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 41732890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 41832890b98SMarc Dietrich 419f686e9afSMarc Dietrich err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 420f686e9afSMarc Dietrich if (err) { 421f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 422f686e9afSMarc Dietrich goto failed; 423f686e9afSMarc Dietrich } 424ac810759SMarc Dietrich disable_irq(nvec->irq); 425f686e9afSMarc Dietrich 426f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 427f686e9afSMarc Dietrich 428ac810759SMarc Dietrich clk_enable(i2c_clk); 429ac810759SMarc Dietrich 430f686e9afSMarc Dietrich gpio_direction_output(nvec->gpio, 1); 431f686e9afSMarc Dietrich gpio_set_value(nvec->gpio, 1); 432f686e9afSMarc Dietrich 43332890b98SMarc Dietrich /* enable event reporting */ 43432890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 43532890b98SMarc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 43632890b98SMarc Dietrich 43732890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 43832890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 43932890b98SMarc Dietrich 44032890b98SMarc Dietrich nvec_power_handle = nvec; 44132890b98SMarc Dietrich pm_power_off = nvec_power_off; 44232890b98SMarc Dietrich 44332890b98SMarc Dietrich /* Get Firmware Version */ 44432890b98SMarc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 44532890b98SMarc Dietrich sizeof(EC_GET_FIRMWARE_VERSION)); 44632890b98SMarc Dietrich 44732890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 44832890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 44932890b98SMarc Dietrich 45032890b98SMarc Dietrich kfree(msg->data); 45132890b98SMarc Dietrich kfree(msg); 45232890b98SMarc Dietrich 453f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 454f686e9afSMarc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 455f686e9afSMarc Dietrich if (ret) 456f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 457f686e9afSMarc Dietrich 45832890b98SMarc Dietrich /* unmute speakers? */ 4596dca320cSMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 46032890b98SMarc Dietrich 46132890b98SMarc Dietrich /* enable lid switch event */ 46232890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 46332890b98SMarc Dietrich 46432890b98SMarc Dietrich /* enable power button event */ 46532890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 46632890b98SMarc Dietrich 46732890b98SMarc Dietrich return 0; 46832890b98SMarc Dietrich 469f686e9afSMarc Dietrich err_iounmap: 470f686e9afSMarc Dietrich iounmap(base); 47132890b98SMarc Dietrich failed: 47232890b98SMarc Dietrich kfree(nvec); 47332890b98SMarc Dietrich return -ENOMEM; 47432890b98SMarc Dietrich } 47532890b98SMarc Dietrich 47632890b98SMarc Dietrich static int __devexit tegra_nvec_remove(struct platform_device *pdev) 47732890b98SMarc Dietrich { 478f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 479f686e9afSMarc Dietrich 480f686e9afSMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 481f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 482f686e9afSMarc Dietrich free_irq(nvec->irq, &nvec_interrupt); 483f686e9afSMarc Dietrich iounmap(nvec->base); 484f686e9afSMarc Dietrich gpio_free(nvec->gpio); 485f686e9afSMarc Dietrich kfree(nvec); 486f686e9afSMarc Dietrich 48732890b98SMarc Dietrich return 0; 48832890b98SMarc Dietrich } 48932890b98SMarc Dietrich 49032890b98SMarc Dietrich #ifdef CONFIG_PM 49132890b98SMarc Dietrich 49232890b98SMarc Dietrich static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 49332890b98SMarc Dietrich { 49432890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 49532890b98SMarc Dietrich 49632890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 49732890b98SMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 49832890b98SMarc Dietrich nvec_write_async(nvec, "\x04\x02", 2); 499ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 50032890b98SMarc Dietrich 50132890b98SMarc Dietrich return 0; 50232890b98SMarc Dietrich } 50332890b98SMarc Dietrich 504162c7d8cSMarc Dietrich static int tegra_nvec_resume(struct platform_device *pdev) 505162c7d8cSMarc Dietrich { 50632890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 50732890b98SMarc Dietrich 50832890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 509f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 51032890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 51132890b98SMarc Dietrich 51232890b98SMarc Dietrich return 0; 51332890b98SMarc Dietrich } 51432890b98SMarc Dietrich 51532890b98SMarc Dietrich #else 51632890b98SMarc Dietrich #define tegra_nvec_suspend NULL 51732890b98SMarc Dietrich #define tegra_nvec_resume NULL 51832890b98SMarc Dietrich #endif 51932890b98SMarc Dietrich 520162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 52132890b98SMarc Dietrich .probe = tegra_nvec_probe, 52232890b98SMarc Dietrich .remove = __devexit_p(tegra_nvec_remove), 52332890b98SMarc Dietrich .suspend = tegra_nvec_suspend, 52432890b98SMarc Dietrich .resume = tegra_nvec_resume, 52532890b98SMarc Dietrich .driver = { 52632890b98SMarc Dietrich .name = "nvec", 52732890b98SMarc Dietrich .owner = THIS_MODULE, 52832890b98SMarc Dietrich } 52932890b98SMarc Dietrich }; 53032890b98SMarc Dietrich 53132890b98SMarc Dietrich static int __init tegra_nvec_init(void) 53232890b98SMarc Dietrich { 53332890b98SMarc Dietrich return platform_driver_register(&nvec_device_driver); 53432890b98SMarc Dietrich } 53532890b98SMarc Dietrich 53632890b98SMarc Dietrich module_init(tegra_nvec_init); 537162c7d8cSMarc Dietrich 53832890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 539162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 540162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 541162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 542