diff options
Diffstat (limited to 'drivers/gpu/drm/i2c/tda9950.c')
| -rw-r--r-- | drivers/gpu/drm/i2c/tda9950.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c deleted file mode 100644 index 82d618c40dce..000000000000 --- a/drivers/gpu/drm/i2c/tda9950.c +++ /dev/null @@ -1,507 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * TDA9950 Consumer Electronics Control driver - * - * The NXP TDA9950 implements the HDMI Consumer Electronics Control - * interface. The host interface is similar to a mailbox: the data - * registers starting at REG_CDR0 are written to send a command to the - * internal CPU, and replies are read from these registers. - * - * As the data registers represent a mailbox, they must be accessed - * as a single I2C transaction. See the TDA9950 data sheet for details. - */ -#include <linux/delay.h> -#include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/platform_data/tda9950.h> -#include <linux/slab.h> -#include <drm/drm_edid.h> -#include <media/cec.h> -#include <media/cec-notifier.h> - -enum { - REG_CSR = 0x00, - CSR_BUSY = BIT(7), - CSR_INT = BIT(6), - CSR_ERR = BIT(5), - - REG_CER = 0x01, - - REG_CVR = 0x02, - - REG_CCR = 0x03, - CCR_RESET = BIT(7), - CCR_ON = BIT(6), - - REG_ACKH = 0x04, - REG_ACKL = 0x05, - - REG_CCONR = 0x06, - CCONR_ENABLE_ERROR = BIT(4), - CCONR_RETRY_MASK = 7, - - REG_CDR0 = 0x07, - - CDR1_REQ = 0x00, - CDR1_CNF = 0x01, - CDR1_IND = 0x81, - CDR1_ERR = 0x82, - CDR1_IER = 0x83, - - CDR2_CNF_SUCCESS = 0x00, - CDR2_CNF_OFF_STATE = 0x80, - CDR2_CNF_BAD_REQ = 0x81, - CDR2_CNF_CEC_ACCESS = 0x82, - CDR2_CNF_ARB_ERROR = 0x83, - CDR2_CNF_BAD_TIMING = 0x84, - CDR2_CNF_NACK_ADDR = 0x85, - CDR2_CNF_NACK_DATA = 0x86, -}; - -struct tda9950_priv { - struct i2c_client *client; - struct device *hdmi; - struct cec_adapter *adap; - struct tda9950_glue *glue; - u16 addresses; - struct cec_msg rx_msg; - struct cec_notifier *notify; - bool open; -}; - -static int tda9950_write_range(struct i2c_client *client, u8 addr, u8 *p, int cnt) -{ - struct i2c_msg msg; - u8 buf[CEC_MAX_MSG_SIZE + 3]; - int ret; - - if (WARN_ON(cnt > sizeof(buf) - 1)) - return -EINVAL; - - buf[0] = addr; - memcpy(buf + 1, p, cnt); - - msg.addr = client->addr; - msg.flags = 0; - msg.len = cnt + 1; - msg.buf = buf; - - dev_dbg(&client->dev, "wr 0x%02x: %*ph\n", addr, cnt, p); - - ret = i2c_transfer(client->adapter, &msg, 1); - if (ret < 0) - dev_err(&client->dev, "Error %d writing to cec:0x%x\n", ret, addr); - return ret < 0 ? ret : 0; -} - -static void tda9950_write(struct i2c_client *client, u8 addr, u8 val) -{ - tda9950_write_range(client, addr, &val, 1); -} - -static int tda9950_read_range(struct i2c_client *client, u8 addr, u8 *p, int cnt) -{ - struct i2c_msg msg[2]; - int ret; - - msg[0].addr = client->addr; - msg[0].flags = 0; - msg[0].len = 1; - msg[0].buf = &addr; - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].len = cnt; - msg[1].buf = p; - - ret = i2c_transfer(client->adapter, msg, 2); - if (ret < 0) - dev_err(&client->dev, "Error %d reading from cec:0x%x\n", ret, addr); - - dev_dbg(&client->dev, "rd 0x%02x: %*ph\n", addr, cnt, p); - - return ret; -} - -static u8 tda9950_read(struct i2c_client *client, u8 addr) -{ - int ret; - u8 val; - - ret = tda9950_read_range(client, addr, &val, 1); - if (ret < 0) - val = 0; - - return val; -} - -static irqreturn_t tda9950_irq(int irq, void *data) -{ - struct tda9950_priv *priv = data; - unsigned int tx_status; - u8 csr, cconr, buf[19]; - u8 arb_lost_cnt, nack_cnt, err_cnt; - - if (!priv->open) - return IRQ_NONE; - - csr = tda9950_read(priv->client, REG_CSR); - if (!(csr & CSR_INT)) - return IRQ_NONE; - - cconr = tda9950_read(priv->client, REG_CCONR) & CCONR_RETRY_MASK; - - tda9950_read_range(priv->client, REG_CDR0, buf, sizeof(buf)); - - /* - * This should never happen: the data sheet says that there will - * always be a valid message if the interrupt line is asserted. - */ - if (buf[0] == 0) { - dev_warn(&priv->client->dev, "interrupt pending, but no message?\n"); - return IRQ_NONE; - } - - switch (buf[1]) { - case CDR1_CNF: /* transmit result */ - arb_lost_cnt = nack_cnt = err_cnt = 0; - switch (buf[2]) { - case CDR2_CNF_SUCCESS: - tx_status = CEC_TX_STATUS_OK; - break; - - case CDR2_CNF_ARB_ERROR: - tx_status = CEC_TX_STATUS_ARB_LOST; - arb_lost_cnt = cconr; - break; - - case CDR2_CNF_NACK_ADDR: - tx_status = CEC_TX_STATUS_NACK; - nack_cnt = cconr; - break; - - default: /* some other error, refer to TDA9950 docs */ - dev_err(&priv->client->dev, "CNF reply error 0x%02x\n", - buf[2]); - tx_status = CEC_TX_STATUS_ERROR; - err_cnt = cconr; - break; - } - /* TDA9950 executes all retries for us */ - if (tx_status != CEC_TX_STATUS_OK) - tx_status |= CEC_TX_STATUS_MAX_RETRIES; - cec_transmit_done(priv->adap, tx_status, arb_lost_cnt, - nack_cnt, 0, err_cnt); - break; - - case CDR1_IND: - priv->rx_msg.len = buf[0] - 2; - if (priv->rx_msg.len > CEC_MAX_MSG_SIZE) - priv->rx_msg.len = CEC_MAX_MSG_SIZE; - - memcpy(priv->rx_msg.msg, buf + 2, priv->rx_msg.len); - cec_received_msg(priv->adap, &priv->rx_msg); - break; - - default: /* unknown */ - dev_err(&priv->client->dev, "unknown service id 0x%02x\n", - buf[1]); - break; - } - - return IRQ_HANDLED; -} - -static int tda9950_cec_transmit(struct cec_adapter *adap, u8 attempts, - u32 signal_free_time, struct cec_msg *msg) -{ - struct tda9950_priv *priv = adap->priv; - u8 buf[CEC_MAX_MSG_SIZE + 2]; - - buf[0] = 2 + msg->len; - buf[1] = CDR1_REQ; - memcpy(buf + 2, msg->msg, msg->len); - - if (attempts > 5) - attempts = 5; - - tda9950_write(priv->client, REG_CCONR, attempts); - - return tda9950_write_range(priv->client, REG_CDR0, buf, 2 + msg->len); -} - -static int tda9950_cec_adap_log_addr(struct cec_adapter *adap, u8 addr) -{ - struct tda9950_priv *priv = adap->priv; - u16 addresses; - u8 buf[2]; - - if (addr == CEC_LOG_ADDR_INVALID) - addresses = priv->addresses = 0; - else - addresses = priv->addresses |= BIT(addr); - - /* TDA9950 doesn't want address 15 set */ - addresses &= 0x7fff; - buf[0] = addresses >> 8; - buf[1] = addresses; - - return tda9950_write_range(priv->client, REG_ACKH, buf, 2); -} - -/* - * When operating as part of the TDA998x, we need additional handling - * to initialise and shut down the TDA9950 part of the device. These - * two hooks are provided to allow the TDA998x code to perform those - * activities. - */ -static int tda9950_glue_open(struct tda9950_priv *priv) -{ - int ret = 0; - - if (priv->glue && priv->glue->open) - ret = priv->glue->open(priv->glue->data); - - priv->open = true; - - return ret; -} - -static void tda9950_glue_release(struct tda9950_priv *priv) -{ - priv->open = false; - - if (priv->glue && priv->glue->release) - priv->glue->release(priv->glue->data); -} - -static int tda9950_open(struct tda9950_priv *priv) -{ - struct i2c_client *client = priv->client; - int ret; - - ret = tda9950_glue_open(priv); - if (ret) - return ret; - - /* Reset the TDA9950, and wait 250ms for it to recover */ - tda9950_write(client, REG_CCR, CCR_RESET); - msleep(250); - - tda9950_cec_adap_log_addr(priv->adap, CEC_LOG_ADDR_INVALID); - - /* Start the command processor */ - tda9950_write(client, REG_CCR, CCR_ON); - - return 0; -} - -static void tda9950_release(struct tda9950_priv *priv) -{ - struct i2c_client *client = priv->client; - int timeout = 50; - u8 csr; - - /* Stop the command processor */ - tda9950_write(client, REG_CCR, 0); - - /* Wait up to .5s for it to signal non-busy */ - do { - csr = tda9950_read(client, REG_CSR); - if (!(csr & CSR_BUSY) || !--timeout) - break; - msleep(10); - } while (1); - - /* Warn the user that their IRQ may die if it's shared. */ - if (csr & CSR_BUSY) - dev_warn(&client->dev, "command processor failed to stop, irq%d may die (csr=0x%02x)\n", - client->irq, csr); - - tda9950_glue_release(priv); -} - -static int tda9950_cec_adap_enable(struct cec_adapter *adap, bool enable) -{ - struct tda9950_priv *priv = adap->priv; - - if (!enable) { - tda9950_release(priv); - return 0; - } else { - return tda9950_open(priv); - } -} - -static const struct cec_adap_ops tda9950_cec_ops = { - .adap_enable = tda9950_cec_adap_enable, - .adap_log_addr = tda9950_cec_adap_log_addr, - .adap_transmit = tda9950_cec_transmit, -}; - -/* - * When operating as part of the TDA998x, we need to claim additional - * resources. These two hooks permit the management of those resources. - */ -static void tda9950_devm_glue_exit(void *data) -{ - struct tda9950_glue *glue = data; - - if (glue && glue->exit) - glue->exit(glue->data); -} - -static int tda9950_devm_glue_init(struct device *dev, struct tda9950_glue *glue) -{ - int ret; - - if (glue && glue->init) { - ret = glue->init(glue->data); - if (ret) - return ret; - } - - ret = devm_add_action(dev, tda9950_devm_glue_exit, glue); - if (ret) - tda9950_devm_glue_exit(glue); - - return ret; -} - -static void tda9950_cec_del(void *data) -{ - struct tda9950_priv *priv = data; - - cec_delete_adapter(priv->adap); -} - -static int tda9950_probe(struct i2c_client *client) -{ - struct tda9950_glue *glue = client->dev.platform_data; - struct device *dev = &client->dev; - struct tda9950_priv *priv; - unsigned long irqflags; - int ret; - u8 cvr; - - /* - * We must have I2C functionality: our multi-byte accesses - * must be performed as a single contiguous transaction. - */ - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { - dev_err(&client->dev, - "adapter does not support I2C functionality\n"); - return -ENXIO; - } - - /* We must have an interrupt to be functional. */ - if (client->irq <= 0) { - dev_err(&client->dev, "driver requires an interrupt\n"); - return -ENXIO; - } - - priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - priv->client = client; - priv->glue = glue; - - i2c_set_clientdata(client, priv); - - /* - * If we're part of a TDA998x, we want the class devices to be - * associated with the HDMI Tx so we have a tight relationship - * between the HDMI interface and the CEC interface. - */ - priv->hdmi = dev; - if (glue && glue->parent) - priv->hdmi = glue->parent; - - priv->adap = cec_allocate_adapter(&tda9950_cec_ops, priv, "tda9950", - CEC_CAP_DEFAULTS | - CEC_CAP_CONNECTOR_INFO, - CEC_MAX_LOG_ADDRS); - if (IS_ERR(priv->adap)) - return PTR_ERR(priv->adap); - - ret = devm_add_action(dev, tda9950_cec_del, priv); - if (ret) { - cec_delete_adapter(priv->adap); - return ret; - } - - ret = tda9950_devm_glue_init(dev, glue); - if (ret) - return ret; - - ret = tda9950_glue_open(priv); - if (ret) - return ret; - - cvr = tda9950_read(client, REG_CVR); - - dev_info(&client->dev, - "TDA9950 CEC interface, hardware version %u.%u\n", - cvr >> 4, cvr & 15); - - tda9950_glue_release(priv); - - irqflags = IRQF_TRIGGER_FALLING; - if (glue) - irqflags = glue->irq_flags; - - ret = devm_request_threaded_irq(dev, client->irq, NULL, tda9950_irq, - irqflags | IRQF_SHARED | IRQF_ONESHOT, - dev_name(&client->dev), priv); - if (ret < 0) - return ret; - - priv->notify = cec_notifier_cec_adap_register(priv->hdmi, NULL, - priv->adap); - if (!priv->notify) - return -ENOMEM; - - ret = cec_register_adapter(priv->adap, priv->hdmi); - if (ret < 0) { - cec_notifier_cec_adap_unregister(priv->notify, priv->adap); - return ret; - } - - /* - * CEC documentation says we must not call cec_delete_adapter - * after a successful call to cec_register_adapter(). - */ - devm_remove_action(dev, tda9950_cec_del, priv); - - return 0; -} - -static void tda9950_remove(struct i2c_client *client) -{ - struct tda9950_priv *priv = i2c_get_clientdata(client); - - cec_notifier_cec_adap_unregister(priv->notify, priv->adap); - cec_unregister_adapter(priv->adap); -} - -static struct i2c_device_id tda9950_ids[] = { - { "tda9950", 0 }, - { }, -}; -MODULE_DEVICE_TABLE(i2c, tda9950_ids); - -static struct i2c_driver tda9950_driver = { - .probe = tda9950_probe, - .remove = tda9950_remove, - .driver = { - .name = "tda9950", - }, - .id_table = tda9950_ids, -}; - -module_i2c_driver(tda9950_driver); - -MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>"); -MODULE_DESCRIPTION("TDA9950/TDA998x Consumer Electronics Control Driver"); -MODULE_LICENSE("GPL v2"); |