Add CEC support to the adv7842 driver.
Signed-off-by: Hans Verkuil hans.verkuil@cisco.com --- drivers/media/i2c/Kconfig | 2 +- drivers/media/i2c/adv7842.c | 331 +++++++++++++++++++++++++++++++++++--------- 2 files changed, 270 insertions(+), 63 deletions(-)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index 3d01ffc..11ca81c 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -220,7 +220,7 @@ config VIDEO_ADV7604
config VIDEO_ADV7842 tristate "Analog Devices ADV7842 decoder" - depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API + depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && MEDIA_CEC select HDMI ---help--- Support for the Analog Devices ADV7842 video decoder. diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c index 7ccb85d..d12abe0 100644 --- a/drivers/media/i2c/adv7842.c +++ b/drivers/media/i2c/adv7842.c @@ -39,6 +39,7 @@ #include <linux/workqueue.h> #include <linux/v4l2-dv-timings.h> #include <linux/hdmi.h> +#include <media/cec.h> #include <media/v4l2-device.h> #include <media/v4l2-event.h> #include <media/v4l2-ctrls.h> @@ -79,6 +80,8 @@ MODULE_LICENSE("GPL");
#define ADV7842_OP_SWAP_CB_CR (1 << 0)
+#define ADV7842_MAX_ADDRS (3) + /* ********************************************************************** * @@ -142,6 +145,10 @@ struct adv7842_state { struct v4l2_ctrl *free_run_color_ctrl_manual; struct v4l2_ctrl *free_run_color_ctrl; struct v4l2_ctrl *rgb_quantization_range_ctrl; + + u8 cec_addr[ADV7842_MAX_ADDRS]; + u8 cec_valid_addrs; + bool cec_enabled_adap; };
/* Unsupported timings. This device cannot support 720p30. */ @@ -418,9 +425,9 @@ static inline int cec_write(struct v4l2_subdev *sd, u8 reg, u8 val) return adv_smbus_write_byte_data(state->i2c_cec, reg, val); }
-static inline int cec_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val) +static inline int cec_write_clr_set(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val) { - return cec_write(sd, reg, (cec_read(sd, reg) & mask) | val); + return cec_write(sd, reg, (cec_read(sd, reg) & ~mask) | val); }
static inline int infoframe_read(struct v4l2_subdev *sd, u8 reg) @@ -696,6 +703,18 @@ adv7842_get_dv_timings_cap(struct v4l2_subdev *sd)
/* ----------------------------------------------------------------------- */
+static u16 adv7842_read_cable_det(struct v4l2_subdev *sd) +{ + u8 reg = io_read(sd, 0x6f); + u16 val = 0; + + if (reg & 0x02) + val |= 1; /* port A */ + if (reg & 0x01) + val |= 2; /* port B */ + return val; +} + static void adv7842_delayed_work_enable_hotplug(struct work_struct *work) { struct delayed_work *dwork = to_delayed_work(work); @@ -703,8 +722,13 @@ static void adv7842_delayed_work_enable_hotplug(struct work_struct *work) struct adv7842_state, delayed_work_enable_hotplug); struct v4l2_subdev *sd = &state->sd; int present = state->hdmi_edid.present; + u16 connected_inputs; u8 mask = 0;
+ connected_inputs = present & adv7842_read_cable_det(sd); + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_CONN_INPUTS, + &connected_inputs); + v4l2_dbg(2, debug, sd, "%s: enable hotplug on ports: 0x%x\n", __func__, present);
@@ -762,50 +786,17 @@ static int edid_write_vga_segment(struct v4l2_subdev *sd) return 0; }
-static int edid_spa_location(const u8 *edid) -{ - u8 d; - - /* - * TODO, improve and update for other CEA extensions - * currently only for 1 segment (256 bytes), - * i.e. 1 extension block and CEA revision 3. - */ - if ((edid[0x7e] != 1) || - (edid[0x80] != 0x02) || - (edid[0x81] != 0x03)) { - return -EINVAL; - } - /* - * search Vendor Specific Data Block (tag 3) - */ - d = edid[0x82] & 0x7f; - if (d > 4) { - int i = 0x84; - int end = 0x80 + d; - do { - u8 tag = edid[i]>>5; - u8 len = edid[i] & 0x1f; - - if ((tag == 3) && (len >= 5)) - return i + 4; - i += len + 1; - } while (i < end); - } - return -EINVAL; -} - static int edid_write_hdmi_segment(struct v4l2_subdev *sd, u8 port) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct adv7842_state *state = to_state(sd); - const u8 *val = state->hdmi_edid.edid; - int spa_loc = edid_spa_location(val); + const u8 *edid = state->hdmi_edid.edid; + int spa_loc; int err = 0; int i;
- v4l2_dbg(2, debug, sd, "%s: write EDID on port %c (spa at 0x%x)\n", - __func__, (port == ADV7842_EDID_PORT_A) ? 'A' : 'B', spa_loc); + v4l2_dbg(2, debug, sd, "%s: write EDID on port %c\n", + __func__, (port == ADV7842_EDID_PORT_A) ? 'A' : 'B');
/* HPA disable on port A and B */ io_write_and_or(sd, 0x20, 0xcf, 0x00); @@ -816,24 +807,30 @@ static int edid_write_hdmi_segment(struct v4l2_subdev *sd, u8 port) if (!state->hdmi_edid.present) return 0;
+ cec_get_edid_phys_addr(edid, 256, &spa_loc); + + /* + * Return an error if no location of the source physical address + * was found. + */ + if (spa_loc == 0) + return -EINVAL; + /* edid segment pointer '0' for HDMI ports */ rep_write_and_or(sd, 0x77, 0xef, 0x00);
for (i = 0; !err && i < 256; i += I2C_SMBUS_BLOCK_MAX) err = adv_smbus_write_i2c_block_data(state->i2c_edid, i, - I2C_SMBUS_BLOCK_MAX, val + i); + I2C_SMBUS_BLOCK_MAX, edid + i); if (err) return err;
- if (spa_loc < 0) - spa_loc = 0xc0; /* Default value [REF_02, p. 199] */ - if (port == ADV7842_EDID_PORT_A) { - rep_write(sd, 0x72, val[spa_loc]); - rep_write(sd, 0x73, val[spa_loc + 1]); + rep_write(sd, 0x72, edid[spa_loc]); + rep_write(sd, 0x73, edid[spa_loc + 1]); } else { - rep_write(sd, 0x74, val[spa_loc]); - rep_write(sd, 0x75, val[spa_loc + 1]); + rep_write(sd, 0x74, edid[spa_loc]); + rep_write(sd, 0x75, edid[spa_loc + 1]); } rep_write(sd, 0x76, spa_loc & 0xff); rep_write_and_or(sd, 0x77, 0xbf, (spa_loc >> 2) & 0x40); @@ -983,20 +980,16 @@ static int adv7842_s_register(struct v4l2_subdev *sd, static int adv7842_s_detect_tx_5v_ctrl(struct v4l2_subdev *sd) { struct adv7842_state *state = to_state(sd); - int prev = v4l2_ctrl_g_ctrl(state->detect_tx_5v_ctrl); - u8 reg_io_6f = io_read(sd, 0x6f); - int val = 0; + u16 cable_det = adv7842_read_cable_det(sd); + u16 connected_inputs;
- if (reg_io_6f & 0x02) - val |= 1; /* port A */ - if (reg_io_6f & 0x01) - val |= 2; /* port B */ + v4l2_dbg(1, debug, sd, "%s: 0x%x\n", __func__, cable_det);
- v4l2_dbg(1, debug, sd, "%s: 0x%x -> 0x%x\n", __func__, prev, val); + connected_inputs = state->hdmi_edid.present & cable_det; + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_CONN_INPUTS, + &connected_inputs);
- if (val != prev) - return v4l2_ctrl_s_ctrl(state->detect_tx_5v_ctrl, val); - return 0; + return v4l2_ctrl_s_ctrl(state->detect_tx_5v_ctrl, cable_det); }
static int find_and_set_predefined_video_timings(struct v4l2_subdev *sd, @@ -2170,6 +2163,196 @@ static void adv7842_irq_enable(struct v4l2_subdev *sd, bool enable) } }
+static void adv7842_cec_tx_raw_status(struct v4l2_subdev *sd, u8 tx_raw_status) +{ + struct v4l2_subdev_cec_tx_done tx_done = {}; + + 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__); + tx_done.status = CEC_TX_STATUS_ARB_LOST; + tx_done.arb_lost_cnt = 1; + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, &tx_done); + return; + } + if (tx_raw_status & 0x04) { + v4l2_dbg(1, debug, sd, "%s: tx raw: retry failed\n", __func__); + /* + * We set this status bit since this hardware performs + * retransmissions. + */ + tx_done.status = CEC_TX_STATUS_MAX_RETRIES; + tx_done.nack_cnt = cec_read(sd, 0x14) & 0xf; + if (tx_done.nack_cnt) + tx_done.status |= CEC_TX_STATUS_NACK; + tx_done.low_drive_cnt = cec_read(sd, 0x14) >> 4; + if (tx_done.low_drive_cnt) + tx_done.status |= CEC_TX_STATUS_LOW_DRIVE; + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, &tx_done); + return; + } + if (tx_raw_status & 0x01) { + v4l2_dbg(1, debug, sd, "%s: tx raw: ready ok\n", __func__); + tx_done.status = CEC_TX_STATUS_OK; + v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, &tx_done); + return; + } +} + +static void adv7842_cec_isr(struct v4l2_subdev *sd, bool *handled) +{ + u8 cec_irq; + + /* cec controller */ + cec_irq = io_read(sd, 0x93) & 0x0f; + if (!cec_irq) + return; + + v4l2_dbg(1, debug, sd, "%s: cec: irq 0x%x\n", __func__, cec_irq); + adv7842_cec_tx_raw_status(sd, cec_irq); + if (cec_irq & 0x08) { + struct cec_msg msg; + + 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); + } + } + + io_write(sd, 0x94, cec_irq); + + if (handled) + *handled = true; +} + +static unsigned adv7842_cec_adap_available_log_addrs(struct v4l2_subdev *sd) +{ + return ADV7842_MAX_ADDRS; +} + +static int adv7842_cec_adap_enable(struct v4l2_subdev *sd, bool enable) +{ + struct adv7842_state *state = to_state(sd); + + if (!state->cec_enabled_adap && enable) { + cec_write_clr_set(sd, 0x2a, 0x01, 0x01); /* power up cec */ + cec_write(sd, 0x2c, 0x01); /* cec soft reset */ + cec_write_clr_set(sd, 0x11, 0x01, 0); /* initially disable tx */ + /* enabled irqs: */ + /* tx: ready */ + /* tx: arbitration lost */ + /* tx: retry timeout */ + /* rx: ready */ + io_write_clr_set(sd, 0x96, 0x0f, 0x0f); + cec_write(sd, 0x26, 0x01); /* enable rx */ + } else if (state->cec_enabled_adap && !enable) { + /* disable cec interrupts */ + io_write_clr_set(sd, 0x96, 0x0f, 0x00); + /* disable address mask 1-3 */ + cec_write_clr_set(sd, 0x27, 0x70, 0x00); + /* power down cec section */ + cec_write_clr_set(sd, 0x2a, 0x01, 0x00); + state->cec_valid_addrs = 0; + } + state->cec_enabled_adap = enable; + return 0; +} + +static int adv7842_cec_adap_log_addr(struct v4l2_subdev *sd, u8 addr) +{ + struct adv7842_state *state = to_state(sd); + unsigned i, free_idx = ADV7842_MAX_ADDRS; + + if (!state->cec_enabled_adap) + return -EIO; + + if (addr == CEC_LOG_ADDR_INVALID) { + cec_write_clr_set(sd, 0x27, 0x70, 0); + state->cec_valid_addrs = 0; + return 0; + } + + for (i = 0; i < ADV7842_MAX_ADDRS; i++) { + bool is_valid = state->cec_valid_addrs & (1 << i); + + if (free_idx == ADV7842_MAX_ADDRS && !is_valid) + free_idx = i; + if (is_valid && state->cec_addr[i] == addr) + return 0; + } + if (i == ADV7842_MAX_ADDRS) { + i = free_idx; + if (i == ADV7842_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_clr_set(sd, 0x27, 0x10, 0x10); + /* set address for mask 0 */ + cec_write_clr_set(sd, 0x28, 0x0f, addr); + break; + case 1: + /* enable address mask 1 */ + cec_write_clr_set(sd, 0x27, 0x20, 0x20); + /* set address for mask 1 */ + cec_write_clr_set(sd, 0x28, 0xf0, addr << 4); + break; + case 2: + /* enable address mask 2 */ + cec_write_clr_set(sd, 0x27, 0x40, 0x40); + /* set address for mask 1 */ + cec_write_clr_set(sd, 0x29, 0x0f, addr); + break; + } + return 0; +} + +static int adv7842_cec_adap_transmit(struct v4l2_subdev *sd, u8 attempts, + u32 signal_free_time, struct cec_msg *msg) +{ + u8 len = msg->len; + unsigned i; + + /* + * The number of retries is the number of attempts - 1, but retry + * at least once. It's not clear if a value of 0 is allowed, so + * let's do at least one retry. + */ + cec_write_clr_set(sd, 0x12, 0x70, max(1, attempts - 1) << 4); + + 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); + return 0; +} + static int adv7842_isr(struct v4l2_subdev *sd, u32 status, bool *handled) { struct adv7842_state *state = to_state(sd); @@ -2241,6 +2424,9 @@ static int adv7842_isr(struct v4l2_subdev *sd, u32 status, bool *handled) *handled = true; }
+ /* cec */ + adv7842_cec_isr(sd, handled); + /* tx 5v detect */ if (irq_status[2] & 0x3) { v4l2_dbg(1, debug, sd, "%s: irq tx_5v\n", __func__); @@ -2321,10 +2507,12 @@ static int adv7842_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *e) case ADV7842_EDID_PORT_A: case ADV7842_EDID_PORT_B: memset(&state->hdmi_edid.edid, 0, 256); - if (e->blocks) + if (e->blocks) { state->hdmi_edid.present |= 0x04 << e->pad; - else + } else { state->hdmi_edid.present &= ~(0x04 << e->pad); + adv7842_s_detect_tx_5v_ctrl(sd); + } memcpy(&state->hdmi_edid.edid, e->edid, 128 * e->blocks); err = edid_write_hdmi_segment(sd, e->pad); break; @@ -2509,8 +2697,19 @@ static int adv7842_cp_log_status(struct v4l2_subdev *sd) v4l2_info(sd, "HPD A %s, B %s\n", reg_io_0x21 & 0x02 ? "enabled" : "disabled", reg_io_0x21 & 0x01 ? "enabled" : "disabled"); - v4l2_info(sd, "CEC %s\n", !!(cec_read(sd, 0x2a) & 0x01) ? + v4l2_info(sd, "CEC: %s\n", state->cec_enabled_adap ? "enabled" : "disabled"); + if (state->cec_enabled_adap) { + int i; + + for (i = 0; i < ADV7842_MAX_ADDRS; i++) { + bool is_valid = state->cec_valid_addrs & (1 << i); + + if (is_valid) + v4l2_info(sd, "CEC Logical Address: 0x%x\n", + state->cec_addr[i]); + } + }
v4l2_info(sd, "-----Signal status-----\n"); if (state->hdmi_port_a) { @@ -3061,6 +3260,13 @@ static const struct v4l2_subdev_video_ops adv7842_video_ops = { .query_dv_timings = adv7842_query_dv_timings, };
+static const struct v4l2_subdev_cec_ops adv7842_cec_ops = { + .adap_available_log_addrs = adv7842_cec_adap_available_log_addrs, + .adap_enable = adv7842_cec_adap_enable, + .adap_log_addr = adv7842_cec_adap_log_addr, + .adap_transmit = adv7842_cec_adap_transmit, +}; + static const struct v4l2_subdev_pad_ops adv7842_pad_ops = { .enum_mbus_code = adv7842_enum_mbus_code, .get_fmt = adv7842_get_format, @@ -3075,6 +3281,7 @@ static const struct v4l2_subdev_ops adv7842_ops = { .core = &adv7842_core_ops, .video = &adv7842_video_ops, .pad = &adv7842_pad_ops, + .cec = &adv7842_cec_ops, };
/* -------------------------- custom ctrls ---------------------------------- */ @@ -3361,7 +3568,7 @@ static int adv7842_remove(struct i2c_client *client) struct adv7842_state *state = to_state(sd);
adv7842_irq_enable(sd, false); - + adv7842_cec_adap_enable(sd, false); cancel_delayed_work(&state->delayed_work_enable_hotplug); destroy_workqueue(state->work_queues); v4l2_device_unregister_subdev(sd);