V4L/DVB (3726): Fix TT budget-ci 1.1 CI slots

It turns out the firmware on the TT budget-ci 1.1 slots doesn't generate
interrupts. This patch adds support for this using polling mode on these
slots.

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 85 insertions, 20 deletions

diff --git a/drivers/media/dvb/ttpci/budget-ci.c b/drivers/media/dvb/ttpci/budget-ci.c
index 5f91036f5b87..e64a609cf4ff 100644
--- a/drivers/media/dvb/ttpci/budget-ci.c
+++ b/drivers/media/dvb/ttpci/budget-ci.c
@@ -71,6 +71,7 @@ struct budget_ci {
         struct tasklet_struct msp430_irq_tasklet;
         struct tasklet_struct ciintf_irq_tasklet;
         int slot_status;
+        int ci_irq;
         struct dvb_ca_en50221 ca;
         char ir_dev_name[50];
         u8 tuner_pll_address; /* used for philips_tdm1316l configs */
@@ -276,8 +277,10 @@ static int ciintf_slot_reset(struct dvb_ca_en50221 *ca, int slot)
         if (slot != 0)
                 return -EINVAL;
 
-        // trigger on RISING edge during reset so we know when READY is re-asserted
-        saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQHI);
+        if (budget_ci->ci_irq) {
+                // trigger on RISING edge during reset so we know when READY is re-asserted
+                saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQHI);
+        }
         budget_ci->slot_status = SLOTSTATUS_RESET;
         ttpci_budget_debiwrite(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1, 0, 1, 0);
         msleep(1);
@@ -370,11 +373,50 @@ static void ciintf_interrupt(unsigned long data)
         }
 }
 
+static int ciintf_poll_slot_status(struct dvb_ca_en50221 *ca, int slot, int open)
+{
+        struct budget_ci *budget_ci = (struct budget_ci *) ca->data;
+        unsigned int flags;
+
+        // ensure we don't get spurious IRQs during initialisation
+        if (!budget_ci->budget.ci_present)
+                return -EINVAL;
+
+        // read the CAM status
+        flags = ttpci_budget_debiread(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1, 1, 0);
+        if (flags & CICONTROL_CAMDETECT) {
+                // mark it as present if it wasn't before
+                if (budget_ci->slot_status & SLOTSTATUS_NONE) {
+                        budget_ci->slot_status = SLOTSTATUS_PRESENT;
+                }
+
+                // during a RESET, we check if we can read from IO memory to see when CAM is ready
+                if (budget_ci->slot_status & SLOTSTATUS_RESET) {
+                        if (ciintf_read_attribute_mem(ca, slot, 0) == 0x1d) {
+                                budget_ci->slot_status = SLOTSTATUS_READY;
+                        }
+                }
+        } else {
+                budget_ci->slot_status = SLOTSTATUS_NONE;
+        }
+
+        if (budget_ci->slot_status != SLOTSTATUS_NONE) {
+                if (budget_ci->slot_status & SLOTSTATUS_READY) {
+                        return DVB_CA_EN50221_POLL_CAM_PRESENT | DVB_CA_EN50221_POLL_CAM_READY;
+                }
+                return DVB_CA_EN50221_POLL_CAM_PRESENT;
+        }
+
+        return 0;
+}
+
 static int ciintf_init(struct budget_ci *budget_ci)
 {
         struct saa7146_dev *saa = budget_ci->budget.dev;
         int flags;
         int result;
+        int ci_version;
+        int ca_flags;
 
         memset(&budget_ci->ca, 0, sizeof(struct dvb_ca_en50221));
 
@@ -382,16 +424,29 @@ static int ciintf_init(struct budget_ci *budget_ci)
         saa7146_write(saa, MC1, saa7146_read(saa, MC1) | (0x800 << 16) | 0x800);
 
         // test if it is there
-        if ((ttpci_budget_debiread(&budget_ci->budget, DEBICICTL, DEBIADDR_CIVERSION, 1, 1, 0) & 0xa0) != 0xa0) {
+        ci_version = ttpci_budget_debiread(&budget_ci->budget, DEBICICTL, DEBIADDR_CIVERSION, 1, 1, 0);
+        if ((ci_version & 0xa0) != 0xa0) {
                 result = -ENODEV;
                 goto error;
         }
+
         // determine whether a CAM is present or not
         flags = ttpci_budget_debiread(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1, 1, 0);
         budget_ci->slot_status = SLOTSTATUS_NONE;
         if (flags & CICONTROL_CAMDETECT)
                 budget_ci->slot_status = SLOTSTATUS_PRESENT;
 
+        // version 0xa2 of the CI firmware doesn't generate interrupts
+        if (ci_version == 0xa2) {
+                ca_flags = 0;
+                budget_ci->ci_irq = 0;
+        } else {
+                ca_flags = DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE |
+                                DVB_CA_EN50221_FLAG_IRQ_FR |
+                                DVB_CA_EN50221_FLAG_IRQ_DA;
+                budget_ci->ci_irq = 1;
+        }
+
         // register CI interface
         budget_ci->ca.owner = THIS_MODULE;
         budget_ci->ca.read_attribute_mem = ciintf_read_attribute_mem;
@@ -401,23 +456,27 @@ static int ciintf_init(struct budget_ci *budget_ci)
         budget_ci->ca.slot_reset = ciintf_slot_reset;
         budget_ci->ca.slot_shutdown = ciintf_slot_shutdown;
         budget_ci->ca.slot_ts_enable = ciintf_slot_ts_enable;
+        budget_ci->ca.poll_slot_status = ciintf_poll_slot_status;
         budget_ci->ca.data = budget_ci;
         if ((result = dvb_ca_en50221_init(&budget_ci->budget.dvb_adapter,
                                           &budget_ci->ca,
-                                          DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE |
-                                          DVB_CA_EN50221_FLAG_IRQ_FR |
-                                          DVB_CA_EN50221_FLAG_IRQ_DA, 1)) != 0) {
+                                          ca_flags, 1)) != 0) {
                 printk("budget_ci: CI interface detected, but initialisation failed.\n");
                 goto error;
         }
+
         // Setup CI slot IRQ
-        tasklet_init(&budget_ci->ciintf_irq_tasklet, ciintf_interrupt, (unsigned long) budget_ci);
-        if (budget_ci->slot_status != SLOTSTATUS_NONE) {
-                saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQLO);
-        } else {
-                saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQHI);
+        if (budget_ci->ci_irq) {
+                tasklet_init(&budget_ci->ciintf_irq_tasklet, ciintf_interrupt, (unsigned long) budget_ci);
+                if (budget_ci->slot_status != SLOTSTATUS_NONE) {
+                        saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQLO);
+                } else {
+                        saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQHI);
+                }
+                saa7146_write(saa, IER, saa7146_read(saa, IER) | MASK_03);
         }
-        saa7146_write(saa, IER, saa7146_read(saa, IER) | MASK_03);
+
+        // enable interface
         ttpci_budget_debiwrite(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1,
                                CICONTROL_RESET, 1, 0);
 
@@ -426,10 +485,12 @@ static int ciintf_init(struct budget_ci *budget_ci)
         budget_ci->budget.ci_present = 1;
 
         // forge a fake CI IRQ so the CAM state is setup correctly
-        flags = DVB_CA_EN50221_CAMCHANGE_REMOVED;
-        if (budget_ci->slot_status != SLOTSTATUS_NONE)
-                flags = DVB_CA_EN50221_CAMCHANGE_INSERTED;
-        dvb_ca_en50221_camchange_irq(&budget_ci->ca, 0, flags);
+        if (budget_ci->ci_irq) {
+                flags = DVB_CA_EN50221_CAMCHANGE_REMOVED;
+                if (budget_ci->slot_status != SLOTSTATUS_NONE)
+                        flags = DVB_CA_EN50221_CAMCHANGE_INSERTED;
+                dvb_ca_en50221_camchange_irq(&budget_ci->ca, 0, flags);
+        }
 
         return 0;
 
@@ -443,9 +504,13 @@ static void ciintf_deinit(struct budget_ci *budget_ci)
         struct saa7146_dev *saa = budget_ci->budget.dev;
 
         // disable CI interrupts
-        saa7146_write(saa, IER, saa7146_read(saa, IER) & ~MASK_03);
-        saa7146_setgpio(saa, 0, SAA7146_GPIO_INPUT);
-        tasklet_kill(&budget_ci->ciintf_irq_tasklet);
+        if (budget_ci->ci_irq) {
+                saa7146_write(saa, IER, saa7146_read(saa, IER) & ~MASK_03);
+                saa7146_setgpio(saa, 0, SAA7146_GPIO_INPUT);
+                tasklet_kill(&budget_ci->ciintf_irq_tasklet);
+        }
+
+        // reset interface
         ttpci_budget_debiwrite(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1, 0, 1, 0);
         msleep(1);
         ttpci_budget_debiwrite(&budget_ci->budget, DEBICICTL, DEBIADDR_CICONTROL, 1,
@@ -473,7 +538,7 @@ static void budget_ci_irq(struct saa7146_dev *dev, u32 * isr)
         if (*isr & MASK_10)
                 ttpci_budget_irq10_handler(dev, isr);
 
-        if ((*isr & MASK_03) && (budget_ci->budget.ci_present))
+        if ((*isr & MASK_03) && (budget_ci->budget.ci_present) && (budget_ci->ci_irq))
                 tasklet_schedule(&budget_ci->ciintf_irq_tasklet);
 }