[media] sp2: Add I2C driver for CIMaX SP2 common interface module

Driver for the CIMaX SP2 common interface chip. It is very much based on
the existing cimax2 driver for cx23885, but should be more reusable. The
product has been sold with name Atmel T90FJR as well and the data sheets
for that chip seem to be publicly available.

It seems that the USB device that I have and the cx23885 based devices will
need to interact differently with the chip for the CAM operations. Thus
there is one callback function that is passed on to the sp2 driver
(see function sp2_ci_op_cam for that one).

IRQ functionality is not included currently (not needed by USB devices
and I don't have a PCIe device for development).

Signed-off-by: Olli Salonen <olli.salonen@iki.fi>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 441 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/sp2.c b/drivers/media/dvb-frontends/sp2.c
new file mode 100644
index 000000000000..9b684d5c8f91
--- /dev/null
+++ b/drivers/media/dvb-frontends/sp2.c
@@ -0,0 +1,441 @@
+/*
+ * CIMaX SP2/SP2HF (Atmel T90FJR) CI driver
+ *
+ * Copyright (C) 2014 Olli Salonen <olli.salonen@iki.fi>
+ *
+ * Heavily based on CIMax2(R) SP2 driver in conjunction with NetUp Dual
+ * DVB-S2 CI card (cimax2) with following copyrights:
+ *
+ *  Copyright (C) 2009 NetUP Inc.
+ *  Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
+ *  Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ */
+
+#include "sp2_priv.h"
+
+static int sp2_read_i2c(struct sp2 *s, u8 reg, u8 *buf, int len)
+{
+        int ret;
+        struct i2c_client *client = s->client;
+        struct i2c_adapter *adap = client->adapter;
+        struct i2c_msg msg[] = {
+                {
+                        .addr = client->addr,
+                        .flags = 0,
+                        .buf = &reg,
+                        .len = 1
+                }, {
+                        .addr = client->addr,
+                        .flags  = I2C_M_RD,
+                        .buf = buf,
+                        .len = len
+                }
+        };
+
+        ret = i2c_transfer(adap, msg, 2);
+
+        if (ret != 2) {
+                dev_err(&client->dev, "i2c read error, reg = 0x%02x, status = %d\n",
+                                reg, ret);
+                if (ret < 0)
+                        return ret;
+                else
+                        return -EIO;
+        }
+
+        dev_dbg(&s->client->dev, "addr=0x%04x, reg = 0x%02x, data = %02x\n",
+                                client->addr, reg, buf[0]);
+
+        return 0;
+}
+
+static int sp2_write_i2c(struct sp2 *s, u8 reg, u8 *buf, int len)
+{
+        int ret;
+        u8 buffer[35];
+        struct i2c_client *client = s->client;
+        struct i2c_adapter *adap = client->adapter;
+        struct i2c_msg msg = {
+                .addr = client->addr,
+                .flags = 0,
+                .buf = &buffer[0],
+                .len = len + 1
+        };
+
+        if ((len + 1) > sizeof(buffer)) {
+                dev_err(&client->dev, "i2c wr reg=%02x: len=%d is too big!\n",
+                                reg, len);
+                return -EINVAL;
+        }
+
+        buffer[0] = reg;
+        memcpy(&buffer[1], buf, len);
+
+        ret = i2c_transfer(adap, &msg, 1);
+
+        if (ret != 1) {
+                dev_err(&client->dev, "i2c write error, reg = 0x%02x, status = %d\n",
+                                reg, ret);
+                if (ret < 0)
+                        return ret;
+                else
+                        return -EIO;
+        }
+
+        return 0;
+}
+
+static int sp2_ci_op_cam(struct dvb_ca_en50221 *en50221, int slot, u8 acs,
+                        u8 read, int addr, u8 data)
+{
+        struct sp2 *s = en50221->data;
+        u8 store;
+        int mem, ret;
+        int (*ci_op_cam)(void*, u8, int, u8, int*) = s->ci_control;
+
+        dev_dbg(&s->client->dev, "slot=%d, acs=0x%02x, addr=0x%04x, data = 0x%02x",
+                        slot, acs, addr, data);
+
+        if (slot != 0)
+                return -EINVAL;
+
+        /*
+         * change module access type between IO space and attribute memory
+         * when needed
+         */
+        if (s->module_access_type != acs) {
+                ret = sp2_read_i2c(s, 0x00, &store, 1);
+
+                if (ret)
+                        return ret;
+
+                store &= ~(SP2_MOD_CTL_ACS1 | SP2_MOD_CTL_ACS0);
+                store |= acs;
+
+                ret = sp2_write_i2c(s, 0x00, &store, 1);
+                if (ret)
+                        return ret;
+        }
+
+        s->module_access_type = acs;
+
+        /* implementation of ci_op_cam is device specific */
+        if (ci_op_cam) {
+                ret = ci_op_cam(s->priv, read, addr, data, &mem);
+        } else {
+                dev_err(&s->client->dev, "callback not defined");
+                return -EINVAL;
+        }
+
+        if (ret)
+                return ret;
+
+        if (read) {
+                dev_dbg(&s->client->dev, "cam read, addr=0x%04x, data = 0x%04x",
+                                addr, mem);
+                return mem;
+        } else {
+                return 0;
+        }
+}
+
+int sp2_ci_read_attribute_mem(struct dvb_ca_en50221 *en50221,
+                                int slot, int addr)
+{
+        return sp2_ci_op_cam(en50221, slot, SP2_CI_ATTR_ACS,
+                        SP2_CI_RD, addr, 0);
+}
+
+int sp2_ci_write_attribute_mem(struct dvb_ca_en50221 *en50221,
+                                int slot, int addr, u8 data)
+{
+        return sp2_ci_op_cam(en50221, slot, SP2_CI_ATTR_ACS,
+                        SP2_CI_WR, addr, data);
+}
+
+int sp2_ci_read_cam_control(struct dvb_ca_en50221 *en50221,
+                                int slot, u8 addr)
+{
+        return sp2_ci_op_cam(en50221, slot, SP2_CI_IO_ACS,
+                        SP2_CI_RD, addr, 0);
+}
+
+int sp2_ci_write_cam_control(struct dvb_ca_en50221 *en50221,
+                                int slot, u8 addr, u8 data)
+{
+        return sp2_ci_op_cam(en50221, slot, SP2_CI_IO_ACS,
+                        SP2_CI_WR, addr, data);
+}
+
+int sp2_ci_slot_reset(struct dvb_ca_en50221 *en50221, int slot)
+{
+        struct sp2 *s = en50221->data;
+        u8 buf;
+        int ret;
+
+        dev_dbg(&s->client->dev, "slot: %d\n", slot);
+
+        if (slot != 0)
+                return -EINVAL;
+
+        /* RST on */
+        buf = SP2_MOD_CTL_RST;
+        ret = sp2_write_i2c(s, 0x00, &buf, 1);
+
+        if (ret)
+                return ret;
+
+        usleep_range(500, 600);
+
+        /* RST off */
+        buf = 0x00;
+        ret = sp2_write_i2c(s, 0x00, &buf, 1);
+
+        if (ret)
+                return ret;
+
+        msleep(1000);
+
+        return 0;
+}
+
+int sp2_ci_slot_shutdown(struct dvb_ca_en50221 *en50221, int slot)
+{
+        struct sp2 *s = en50221->data;
+
+        dev_dbg(&s->client->dev, "slot:%d\n", slot);
+
+        /* not implemented */
+        return 0;
+}
+
+int sp2_ci_slot_ts_enable(struct dvb_ca_en50221 *en50221, int slot)
+{
+        struct sp2 *s = en50221->data;
+        u8 buf;
+
+        dev_dbg(&s->client->dev, "slot:%d\n", slot);
+
+        if (slot != 0)
+                return -EINVAL;
+
+        sp2_read_i2c(s, 0x00, &buf, 1);
+
+        /* disable bypass and enable TS */
+        buf |= (SP2_MOD_CTL_TSOEN | SP2_MOD_CTL_TSIEN);
+        return sp2_write_i2c(s, 0, &buf, 1);
+}
+
+int sp2_ci_poll_slot_status(struct dvb_ca_en50221 *en50221,
+                                int slot, int open)
+{
+        struct sp2 *s = en50221->data;
+        u8 buf[2];
+        int ret;
+
+        dev_dbg(&s->client->dev, "slot:%d open:%d\n", slot, open);
+
+        /*
+         * CAM module INSERT/REMOVE processing. Slow operation because of i2c
+         * transfers. Throttle read to one per sec.
+         */
+        if (time_after(jiffies, s->next_status_checked_time)) {
+                ret = sp2_read_i2c(s, 0x00, buf, 1);
+                s->next_status_checked_time = jiffies + msecs_to_jiffies(1000);
+
+                if (ret)
+                        return 0;
+
+                if (buf[0] & SP2_MOD_CTL_DET)
+                        s->status = DVB_CA_EN50221_POLL_CAM_PRESENT |
+                                        DVB_CA_EN50221_POLL_CAM_READY;
+                else
+                        s->status = 0;
+        }
+
+        return s->status;
+}
+
+int sp2_init(struct sp2 *s)
+{
+        int ret = 0;
+        u8 buf;
+        u8 cimax_init[34] = {
+                0x00, /* module A control*/
+                0x00, /* auto select mask high A */
+                0x00, /* auto select mask low A */
+                0x00, /* auto select pattern high A */
+                0x00, /* auto select pattern low A */
+                0x44, /* memory access time A, 600 ns */
+                0x00, /* invert input A */
+                0x00, /* RFU */
+                0x00, /* RFU */
+                0x00, /* module B control*/
+                0x00, /* auto select mask high B */
+                0x00, /* auto select mask low B */
+                0x00, /* auto select pattern high B */
+                0x00, /* auto select pattern low B */
+                0x44, /* memory access time B, 600 ns */
+                0x00, /* invert input B */
+                0x00, /* RFU */
+                0x00, /* RFU */
+                0x00, /* auto select mask high Ext */
+                0x00, /* auto select mask low Ext */
+                0x00, /* auto select pattern high Ext */
+                0x00, /* auto select pattern low Ext */
+                0x00, /* RFU */
+                0x02, /* destination - module A */
+                0x01, /* power control reg, VCC power on */
+                0x00, /* RFU */
+                0x00, /* int status read only */
+                0x00, /* Interrupt Mask Register */
+                0x05, /* EXTINT=active-high, INT=push-pull */
+                0x00, /* USCG1 */
+                0x04, /* ack active low */
+                0x00, /* LOCK = 0 */
+                0x22, /* unknown */
+                0x00, /* synchronization? */
+        };
+
+        dev_dbg(&s->client->dev, "\n");
+
+        s->ca.owner = THIS_MODULE;
+        s->ca.read_attribute_mem = sp2_ci_read_attribute_mem;
+        s->ca.write_attribute_mem = sp2_ci_write_attribute_mem;
+        s->ca.read_cam_control = sp2_ci_read_cam_control;
+        s->ca.write_cam_control = sp2_ci_write_cam_control;
+        s->ca.slot_reset = sp2_ci_slot_reset;
+        s->ca.slot_shutdown = sp2_ci_slot_shutdown;
+        s->ca.slot_ts_enable = sp2_ci_slot_ts_enable;
+        s->ca.poll_slot_status = sp2_ci_poll_slot_status;
+        s->ca.data = s;
+        s->module_access_type = 0;
+
+        /* initialize all regs */
+        ret = sp2_write_i2c(s, 0x00, &cimax_init[0], 34);
+        if (ret)
+                goto err;
+
+        /* lock registers */
+        buf = 1;
+        ret = sp2_write_i2c(s, 0x1f, &buf, 1);
+        if (ret)
+                goto err;
+
+        /* power on slots */
+        ret = sp2_write_i2c(s, 0x18, &buf, 1);
+        if (ret)
+                goto err;
+
+        ret = dvb_ca_en50221_init(s->dvb_adap, &s->ca, 0, 1);
+        if (ret)
+                goto err;
+
+        return 0;
+
+err:
+        dev_dbg(&s->client->dev, "init failed=%d\n", ret);
+        return ret;
+}
+
+int sp2_exit(struct i2c_client *client)
+{
+        struct sp2 *s;
+
+        dev_dbg(&client->dev, "\n");
+
+        if (client == NULL)
+                return 0;
+
+        s = i2c_get_clientdata(client);
+        if (s == NULL)
+                return 0;
+
+        if (s->ca.data == NULL)
+                return 0;
+
+        dvb_ca_en50221_release(&s->ca);
+
+        return 0;
+}
+
+static int sp2_probe(struct i2c_client *client,
+                const struct i2c_device_id *id)
+{
+        struct sp2_config *cfg = client->dev.platform_data;
+        struct sp2 *s;
+        int ret;
+
+        dev_dbg(&client->dev, "\n");
+
+        s = kzalloc(sizeof(struct sp2), GFP_KERNEL);
+        if (!s) {
+                ret = -ENOMEM;
+                dev_err(&client->dev, "kzalloc() failed\n");
+                goto err;
+        }
+
+        s->client = client;
+        s->dvb_adap = cfg->dvb_adap;
+        s->priv = cfg->priv;
+        s->ci_control = cfg->ci_control;
+
+        i2c_set_clientdata(client, s);
+
+        ret = sp2_init(s);
+        if (ret)
+                goto err;
+
+        dev_info(&s->client->dev, "CIMaX SP2 successfully attached\n");
+        return 0;
+err:
+        dev_dbg(&client->dev, "init failed=%d\n", ret);
+        kfree(s);
+
+        return ret;
+}
+
+static int sp2_remove(struct i2c_client *client)
+{
+        struct si2157 *s = i2c_get_clientdata(client);
+
+        dev_dbg(&client->dev, "\n");
+
+        sp2_exit(client);
+        if (s != NULL)
+                kfree(s);
+
+        return 0;
+}
+
+static const struct i2c_device_id sp2_id[] = {
+        {"sp2", 0},
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, sp2_id);
+
+static struct i2c_driver sp2_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "sp2",
+        },
+        .probe          = sp2_probe,
+        .remove         = sp2_remove,
+        .id_table       = sp2_id,
+};
+
+module_i2c_driver(sp2_driver);
+
+MODULE_DESCRIPTION("CIMaX SP2/HF CI driver");
+MODULE_AUTHOR("Olli Salonen <olli.salonen@iki.fi>");
+MODULE_LICENSE("GPL");