From: Hans Verkuil hansverk@cisco.com
Add CEC support to the adv7604 driver.
Signed-off-by: Hans Verkuil hansverk@cisco.com [k.debski@samsung.com: Merged changes from CEC Updates commit by Hans Verkuil] Signed-off-by: Kamil Debski k.debski@samsung.com --- drivers/media/i2c/adv7604.c | 182 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 182 insertions(+)
diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index aaab9c9..ce9d123 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -42,6 +42,7 @@ #include <media/v4l2-device.h> #include <media/v4l2-dv-timings.h> #include <media/v4l2-of.h> +#include <media/cec.h>
static int debug; module_param(debug, int, 0644); @@ -159,6 +160,10 @@ struct adv76xx_state { u16 spa_port_a[2]; struct v4l2_fract aspect_ratio; u32 rgb_quantization_range; + u8 cec_addr[3]; + u8 cec_valid_addrs; + bool cec_enabled_adap; + struct workqueue_struct *work_queues; struct delayed_work delayed_work_enable_hotplug; bool restart_stdi_once; @@ -1862,6 +1867,176 @@ static int adv76xx_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh, return 0; }
+static void adv7604_cec_tx_raw_status(struct v4l2_subdev *sd, u8 tx_raw_status) +{ + if ((cec_read(sd, 0x11) & 0x01) == 0) { + v4l2_dbg(1, debug, sd, "%s: tx raw: tx disabled\n", __func__); + return; + } + + if (tx_raw_status & 0x02) { + v4l2_dbg(1, debug, sd, "%s: tx raw: arbitration lost\n", __func__); + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_ARB_LOST); + return; + } + if (tx_raw_status & 0x04) { + v4l2_dbg(1, debug, sd, "%s: tx raw: retry failed\n", __func__); + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_RETRY_TIMEOUT); + return; + } + if (tx_raw_status & 0x01) { + v4l2_dbg(1, debug, sd, "%s: tx raw: ready ok\n", __func__); + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_OK); + return; + } +} + +static void adv7604_cec_isr(struct v4l2_subdev *sd, bool *handled) +{ + struct cec_msg msg; + u8 cec_irq; + + /* cec controller */ + cec_irq = io_read(sd, 0x4d) & 0x0f; + if (!cec_irq) + return; + + v4l2_dbg(1, debug, sd, "%s: cec: irq 0x%x\n", __func__, cec_irq); + adv7604_cec_tx_raw_status(sd, cec_irq); + if (cec_irq & 0x08) { + msg.len = cec_read(sd, 0x25) & 0x1f; + if (msg.len > 16) + msg.len = 16; + + if (msg.len) { + u8 i; + + for (i = 0; i < msg.len; i++) + msg.msg[i] = cec_read(sd, i + 0x15); + cec_write(sd, 0x26, 0x01); /* re-enable rx */ + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_RX_MSG, &msg); + } + } + + /* note: the bit order is swapped between 0x4d and 0x4e */ + cec_irq = ((cec_irq & 0x08) >> 3) | ((cec_irq & 0x04) >> 1) | + ((cec_irq & 0x02) << 1) | ((cec_irq & 0x01) << 3); + io_write(sd, 0x4e, cec_irq); + + if (handled) + *handled = true; +} + +static int adv7604_cec_enable(struct v4l2_subdev *sd, bool enable) +{ + struct adv7604_state *state = to_state(sd); + + if (!state->cec_enabled_adap && enable) { + cec_write_and_or(sd, 0x2a, 0xfe, 0x01); /* power up cec */ + cec_write(sd, 0x2c, 0x01); /* cec soft reset */ + cec_write_and_or(sd, 0x11, 0xfe, 0); /* initially disable tx */ + /* enabled irqs: */ + /* tx: ready */ + /* tx: arbitration lost */ + /* tx: retry timeout */ + /* rx: ready */ + io_write_and_or(sd, 0x50, 0xf0, 0x0f); + cec_write(sd, 0x26, 0x01); /* enable rx */ + } else if (state->cec_enabled_adap && !enable) { + io_write_and_or(sd, 0x50, 0xf0, 0x00); /* disable cec interrupts */ + cec_write_and_or(sd, 0x27, 0x8f, 0x70); /* disable address mask 1-3 */ + cec_write_and_or(sd, 0x2a, 0xfe, 0x00); /* power down cec section */ + state->cec_valid_addrs = 0; + } + state->cec_enabled_adap = enable; + return 0; +} + +#define ADV7604_MAX_ADDRS (3) + +static int adv7604_cec_log_addr(struct v4l2_subdev *sd, u8 addr) +{ + struct adv7604_state *state = to_state(sd); + unsigned i, free_idx = ADV7604_MAX_ADDRS; + + if (!state->cec_enabled_adap) + return -EIO; + + for (i = 0; i < ADV7604_MAX_ADDRS; i++) { + bool is_valid = state->cec_valid_addrs & (1 << i); + + if (free_idx == ADV7604_MAX_ADDRS && !is_valid) + free_idx = i; + if (is_valid && state->cec_addr[i] == addr) + return 0; + } + if (i == ADV7604_MAX_ADDRS) { + i = free_idx; + if (i == ADV7604_MAX_ADDRS) + return -ENXIO; + } + state->cec_addr[i] = addr; + state->cec_valid_addrs |= 1 << i; + + switch (i) { + case 0: + /* enable address mask 0 */ + cec_write_and_or(sd, 0x27, 0xef, 0x10); + /* set address for mask 0 */ + cec_write_and_or(sd, 0x28, 0xf0, addr); + break; + case 1: + /* enable address mask 1 */ + cec_write_and_or(sd, 0x27, 0xdf, 0x20); + /* set address for mask 1 */ + cec_write_and_or(sd, 0x28, 0x0f, addr << 4); + break; + case 2: + /* enable address mask 2 */ + cec_write_and_or(sd, 0x27, 0xbf, 0x40); + /* set address for mask 1 */ + cec_write_and_or(sd, 0x29, 0xf0, addr); + break; + } + return 0; +} + +static int adv7604_cec_transmit(struct v4l2_subdev *sd, struct cec_msg *msg) +{ + u8 len = msg->len; + unsigned i; + + if (len == 1) + cec_write_and_or(sd, 0x12, 0xf8, 1); /* allow for one retry for polling */ + else + cec_write_and_or(sd, 0x12, 0xf8, 3); /* allow for three retries */ + + if (len > 16) { + v4l2_err(sd, "%s: len exceeded 16 (%d)\n", __func__, len); + return -EINVAL; + } + + /* write data */ + for (i = 0; i < len; i++) + cec_write(sd, i, msg->msg[i]); + + /* set length (data + header) */ + cec_write(sd, 0x10, len); + /* start transmit, enable tx */ + cec_write(sd, 0x11, 0x01); + /* For some reason sometimes the + * transmit won't start. + * Doing it twice seems to help ? + */ + cec_write(sd, 0x11, 0x01); + return 0; +} + +static void adv7604_cec_transmit_timed_out(struct v4l2_subdev *sd) +{ + cec_write_and_or(sd, 0x11, 0xfe, 0); /* disable tx */ +} + static int adv76xx_isr(struct v4l2_subdev *sd, u32 status, bool *handled) { struct adv76xx_state *state = to_state(sd); @@ -1907,6 +2082,9 @@ static int adv76xx_isr(struct v4l2_subdev *sd, u32 status, bool *handled) *handled = true; }
+ /* cec */ + adv7604_cec_isr(sd, handled); + /* tx 5v detect */ tx_5v = io_read(sd, 0x70) & info->cable_det_mask; if (tx_5v) { @@ -2301,6 +2479,10 @@ static const struct v4l2_subdev_video_ops adv76xx_video_ops = { .s_dv_timings = adv76xx_s_dv_timings, .g_dv_timings = adv76xx_g_dv_timings, .query_dv_timings = adv76xx_query_dv_timings, + .cec_enable = adv7604_cec_enable, + .cec_log_addr = adv7604_cec_log_addr, + .cec_transmit = adv7604_cec_transmit, + .cec_transmit_timed_out = adv7604_cec_transmit_timed_out, };
static const struct v4l2_subdev_pad_ops adv76xx_pad_ops = {