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| #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: |
| <------><------>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: |
| <------><------><------>dev_err(&priv->client->dev, "CNF reply error 0x%02x\n", |
| <------><------><------><------>buf[2]); |
| <------><------><------>tx_status = CEC_TX_STATUS_ERROR; |
| <------><------><------>err_cnt = cconr; |
| <------><------><------>break; |
| <------><------>} |
| <------><------> |
| <------><------>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: |
| <------><------>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); |
| |
| <------> |
| <------>addresses &= 0x7fff; |
| <------>buf[0] = addresses >> 8; |
| <------>buf[1] = addresses; |
| |
| <------>return tda9950_write_range(priv->client, REG_ACKH, buf, 2); |
| } |
| |
| |
| |
| |
| |
| |
| |
| 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; |
| |
| <------> |
| <------>tda9950_write(client, REG_CCR, CCR_RESET); |
| <------>msleep(250); |
| |
| <------>tda9950_cec_adap_log_addr(priv->adap, CEC_LOG_ADDR_INVALID); |
| |
| <------> |
| <------>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; |
| |
| <------> |
| <------>tda9950_write(client, REG_CCR, 0); |
| |
| <------> |
| <------>do { |
| <------><------>csr = tda9950_read(client, REG_CSR); |
| <------><------>if (!(csr & CSR_BUSY) || !--timeout) |
| <------><------><------>break; |
| <------><------>msleep(10); |
| <------>} while (1); |
| |
| <------> |
| <------>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, |
| }; |
| |
| |
| |
| |
| |
| 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, |
| <------><------><------> const struct i2c_device_id *id) |
| { |
| <------>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; |
| <------>} |
| |
| <------> |
| <------>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 int 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); |
| |
| <------>return 0; |
| } |
| |
| 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"); |
| |