1 files changed, 629 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/sp887x.c b/drivers/media/dvb-frontends/sp887x.c
new file mode 100644
index 000000000000..f4096ccb226e
--- /dev/null
+++ b/drivers/media/dvb-frontends/sp887x.c
@@ -0,0 +1,629 @@
+/*
+   Driver for the Spase sp887x demodulator
+*/
+
+/*
+ * This driver needs external firmware. Please use the command
+ * "<kerneldir>/Documentation/dvb/get_dvb_firmware sp887x" to
+ * download/extract it, and then copy it to /usr/lib/hotplug/firmware
+ * or /lib/firmware (depending on configuration of firmware hotplug).
+ */
+#define SP887X_DEFAULT_FIRMWARE "dvb-fe-sp887x.fw"
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include "dvb_frontend.h"
+#include "sp887x.h"
+
+
+struct sp887x_state {
+        struct i2c_adapter* i2c;
+        const struct sp887x_config* config;
+        struct dvb_frontend frontend;
+
+        /* demodulator private data */
+        u8 initialised:1;
+};
+
+static int debug;
+#define dprintk(args...) \
+        do { \
+                if (debug) printk(KERN_DEBUG "sp887x: " args); \
+        } while (0)
+
+static int i2c_writebytes (struct sp887x_state* state, u8 *buf, u8 len)
+{
+        struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = len };
+        int err;
+
+        if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
+                printk ("%s: i2c write error (addr %02x, err == %i)\n",
+                        __func__, state->config->demod_address, err);
+                return -EREMOTEIO;
+        }
+
+        return 0;
+}
+
+static int sp887x_writereg (struct sp887x_state* state, u16 reg, u16 data)
+{
+        u8 b0 [] = { reg >> 8 , reg & 0xff, data >> 8, data & 0xff };
+        struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 4 };
+        int ret;
+
+        if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) {
+                /**
+                 *  in case of soft reset we ignore ACK errors...
+                 */
+                if (!(reg == 0xf1a && data == 0x000 &&
+                        (ret == -EREMOTEIO || ret == -EFAULT)))
+                {
+                        printk("%s: writereg error "
+                               "(reg %03x, data %03x, ret == %i)\n",
+                               __func__, reg & 0xffff, data & 0xffff, ret);
+                        return ret;
+                }
+        }
+
+        return 0;
+}
+
+static int sp887x_readreg (struct sp887x_state* state, u16 reg)
+{
+        u8 b0 [] = { reg >> 8 , reg & 0xff };
+        u8 b1 [2];
+        int ret;
+        struct i2c_msg msg[] = {{ .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
+                         { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 }};
+
+        if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) {
+                printk("%s: readreg error (ret == %i)\n", __func__, ret);
+                return -1;
+        }
+
+        return (((b1[0] << 8) | b1[1]) & 0xfff);
+}
+
+static void sp887x_microcontroller_stop (struct sp887x_state* state)
+{
+        dprintk("%s\n", __func__);
+        sp887x_writereg(state, 0xf08, 0x000);
+        sp887x_writereg(state, 0xf09, 0x000);
+
+        /* microcontroller STOP */
+        sp887x_writereg(state, 0xf00, 0x000);
+}
+
+static void sp887x_microcontroller_start (struct sp887x_state* state)
+{
+        dprintk("%s\n", __func__);
+        sp887x_writereg(state, 0xf08, 0x000);
+        sp887x_writereg(state, 0xf09, 0x000);
+
+        /* microcontroller START */
+        sp887x_writereg(state, 0xf00, 0x001);
+}
+
+static void sp887x_setup_agc (struct sp887x_state* state)
+{
+        /* setup AGC parameters */
+        dprintk("%s\n", __func__);
+        sp887x_writereg(state, 0x33c, 0x054);
+        sp887x_writereg(state, 0x33b, 0x04c);
+        sp887x_writereg(state, 0x328, 0x000);
+        sp887x_writereg(state, 0x327, 0x005);
+        sp887x_writereg(state, 0x326, 0x001);
+        sp887x_writereg(state, 0x325, 0x001);
+        sp887x_writereg(state, 0x324, 0x001);
+        sp887x_writereg(state, 0x318, 0x050);
+        sp887x_writereg(state, 0x317, 0x3fe);
+        sp887x_writereg(state, 0x316, 0x001);
+        sp887x_writereg(state, 0x313, 0x005);
+        sp887x_writereg(state, 0x312, 0x002);
+        sp887x_writereg(state, 0x306, 0x000);
+        sp887x_writereg(state, 0x303, 0x000);
+}
+
+#define BLOCKSIZE 30
+#define FW_SIZE 0x4000
+/**
+ *  load firmware and setup MPEG interface...
+ */
+static int sp887x_initial_setup (struct dvb_frontend* fe, const struct firmware *fw)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+        u8 buf [BLOCKSIZE+2];
+        int i;
+        int fw_size = fw->size;
+        const unsigned char *mem = fw->data;
+
+        dprintk("%s\n", __func__);
+
+        /* ignore the first 10 bytes, then we expect 0x4000 bytes of firmware */
+        if (fw_size < FW_SIZE+10)
+                return -ENODEV;
+
+        mem = fw->data + 10;
+
+        /* soft reset */
+        sp887x_writereg(state, 0xf1a, 0x000);
+
+        sp887x_microcontroller_stop (state);
+
+        printk ("%s: firmware upload... ", __func__);
+
+        /* setup write pointer to -1 (end of memory) */
+        /* bit 0x8000 in address is set to enable 13bit mode */
+        sp887x_writereg(state, 0x8f08, 0x1fff);
+
+        /* dummy write (wrap around to start of memory) */
+        sp887x_writereg(state, 0x8f0a, 0x0000);
+
+        for (i = 0; i < FW_SIZE; i += BLOCKSIZE) {
+                int c = BLOCKSIZE;
+                int err;
+
+                if (i+c > FW_SIZE)
+                        c = FW_SIZE - i;
+
+                /* bit 0x8000 in address is set to enable 13bit mode */
+                /* bit 0x4000 enables multibyte read/write transfers */
+                /* write register is 0xf0a */
+                buf[0] = 0xcf;
+                buf[1] = 0x0a;
+
+                memcpy(&buf[2], mem + i, c);
+
+                if ((err = i2c_writebytes (state, buf, c+2)) < 0) {
+                        printk ("failed.\n");
+                        printk ("%s: i2c error (err == %i)\n", __func__, err);
+                        return err;
+                }
+        }
+
+        /* don't write RS bytes between packets */
+        sp887x_writereg(state, 0xc13, 0x001);
+
+        /* suppress clock if (!data_valid) */
+        sp887x_writereg(state, 0xc14, 0x000);
+
+        /* setup MPEG interface... */
+        sp887x_writereg(state, 0xc1a, 0x872);
+        sp887x_writereg(state, 0xc1b, 0x001);
+        sp887x_writereg(state, 0xc1c, 0x000); /* parallel mode (serial mode == 1) */
+        sp887x_writereg(state, 0xc1a, 0x871);
+
+        /* ADC mode, 2 for MT8872, 3 for SP8870/SP8871 */
+        sp887x_writereg(state, 0x301, 0x002);
+
+        sp887x_setup_agc(state);
+
+        /* bit 0x010: enable data valid signal */
+        sp887x_writereg(state, 0xd00, 0x010);
+        sp887x_writereg(state, 0x0d1, 0x000);
+        return 0;
+};
+
+static int configure_reg0xc05(struct dtv_frontend_properties *p, u16 *reg0xc05)
+{
+        int known_parameters = 1;
+
+        *reg0xc05 = 0x000;
+
+        switch (p->modulation) {
+        case QPSK:
+                break;
+        case QAM_16:
+                *reg0xc05 |= (1 << 10);
+                break;
+        case QAM_64:
+                *reg0xc05 |= (2 << 10);
+                break;
+        case QAM_AUTO:
+                known_parameters = 0;
+                break;
+        default:
+                return -EINVAL;
+        };
+
+        switch (p->hierarchy) {
+        case HIERARCHY_NONE:
+                break;
+        case HIERARCHY_1:
+                *reg0xc05 |= (1 << 7);
+                break;
+        case HIERARCHY_2:
+                *reg0xc05 |= (2 << 7);
+                break;
+        case HIERARCHY_4:
+                *reg0xc05 |= (3 << 7);
+                break;
+        case HIERARCHY_AUTO:
+                known_parameters = 0;
+                break;
+        default:
+                return -EINVAL;
+        };
+
+        switch (p->code_rate_HP) {
+        case FEC_1_2:
+                break;
+        case FEC_2_3:
+                *reg0xc05 |= (1 << 3);
+                break;
+        case FEC_3_4:
+                *reg0xc05 |= (2 << 3);
+                break;
+        case FEC_5_6:
+                *reg0xc05 |= (3 << 3);
+                break;
+        case FEC_7_8:
+                *reg0xc05 |= (4 << 3);
+                break;
+        case FEC_AUTO:
+                known_parameters = 0;
+                break;
+        default:
+                return -EINVAL;
+        };
+
+        if (known_parameters)
+                *reg0xc05 |= (2 << 1);  /* use specified parameters */
+        else
+                *reg0xc05 |= (1 << 1);  /* enable autoprobing */
+
+        return 0;
+}
+
+/**
+ *  estimates division of two 24bit numbers,
+ *  derived from the ves1820/stv0299 driver code
+ */
+static void divide (int n, int d, int *quotient_i, int *quotient_f)
+{
+        unsigned int q, r;
+
+        r = (n % d) << 8;
+        q = (r / d);
+
+        if (quotient_i)
+                *quotient_i = q;
+
+        if (quotient_f) {
+                r = (r % d) << 8;
+                q = (q << 8) | (r / d);
+                r = (r % d) << 8;
+                *quotient_f = (q << 8) | (r / d);
+        }
+}
+
+static void sp887x_correct_offsets (struct sp887x_state* state,
+                                    struct dtv_frontend_properties *p,
+                                    int actual_freq)
+{
+        static const u32 srate_correction [] = { 1879617, 4544878, 8098561 };
+        int bw_index;
+        int freq_offset = actual_freq - p->frequency;
+        int sysclock = 61003; //[kHz]
+        int ifreq = 36000000;
+        int freq;
+        int frequency_shift;
+
+        switch (p->bandwidth_hz) {
+        default:
+        case 8000000:
+                bw_index = 0;
+                break;
+        case 7000000:
+                bw_index = 1;
+                break;
+        case 6000000:
+                bw_index = 2;
+                break;
+        }
+
+        if (p->inversion == INVERSION_ON)
+                freq = ifreq - freq_offset;
+        else
+                freq = ifreq + freq_offset;
+
+        divide(freq / 333, sysclock, NULL, &frequency_shift);
+
+        if (p->inversion == INVERSION_ON)
+                frequency_shift = -frequency_shift;
+
+        /* sample rate correction */
+        sp887x_writereg(state, 0x319, srate_correction[bw_index] >> 12);
+        sp887x_writereg(state, 0x31a, srate_correction[bw_index] & 0xfff);
+
+        /* carrier offset correction */
+        sp887x_writereg(state, 0x309, frequency_shift >> 12);
+        sp887x_writereg(state, 0x30a, frequency_shift & 0xfff);
+}
+
+static int sp887x_setup_frontend_parameters(struct dvb_frontend *fe)
+{
+        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+        struct sp887x_state* state = fe->demodulator_priv;
+        unsigned actual_freq;
+        int err;
+        u16 val, reg0xc05;
+
+        if (p->bandwidth_hz != 8000000 &&
+            p->bandwidth_hz != 7000000 &&
+            p->bandwidth_hz != 6000000)
+                return -EINVAL;
+
+        if ((err = configure_reg0xc05(p, &reg0xc05)))
+                return err;
+
+        sp887x_microcontroller_stop(state);
+
+        /* setup the PLL */
+        if (fe->ops.tuner_ops.set_params) {
+                fe->ops.tuner_ops.set_params(fe);
+                if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
+        }
+        if (fe->ops.tuner_ops.get_frequency) {
+                fe->ops.tuner_ops.get_frequency(fe, &actual_freq);
+                if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
+        } else {
+                actual_freq = p->frequency;
+        }
+
+        /* read status reg in order to clear <pending irqs */
+        sp887x_readreg(state, 0x200);
+
+        sp887x_correct_offsets(state, p, actual_freq);
+
+        /* filter for 6/7/8 Mhz channel */
+        if (p->bandwidth_hz == 6000000)
+                val = 2;
+        else if (p->bandwidth_hz == 7000000)
+                val = 1;
+        else
+                val = 0;
+
+        sp887x_writereg(state, 0x311, val);
+
+        /* scan order: 2k first = 0, 8k first = 1 */
+        if (p->transmission_mode == TRANSMISSION_MODE_2K)
+                sp887x_writereg(state, 0x338, 0x000);
+        else
+                sp887x_writereg(state, 0x338, 0x001);
+
+        sp887x_writereg(state, 0xc05, reg0xc05);
+
+        if (p->bandwidth_hz == 6000000)
+                val = 2 << 3;
+        else if (p->bandwidth_hz == 7000000)
+                val = 3 << 3;
+        else
+                val = 0 << 3;
+
+        /* enable OFDM and SAW bits as lock indicators in sync register 0xf17,
+         * optimize algorithm for given bandwidth...
+         */
+        sp887x_writereg(state, 0xf14, 0x160 | val);
+        sp887x_writereg(state, 0xf15, 0x000);
+
+        sp887x_microcontroller_start(state);
+        return 0;
+}
+
+static int sp887x_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+        u16 snr12 = sp887x_readreg(state, 0xf16);
+        u16 sync0x200 = sp887x_readreg(state, 0x200);
+        u16 sync0xf17 = sp887x_readreg(state, 0xf17);
+
+        *status = 0;
+
+        if (snr12 > 0x00f)
+                *status |= FE_HAS_SIGNAL;
+
+        //if (sync0x200 & 0x004)
+        //      *status |= FE_HAS_SYNC | FE_HAS_CARRIER;
+
+        //if (sync0x200 & 0x008)
+        //      *status |= FE_HAS_VITERBI;
+
+        if ((sync0xf17 & 0x00f) == 0x002) {
+                *status |= FE_HAS_LOCK;
+                *status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_CARRIER;
+        }
+
+        if (sync0x200 & 0x001) {        /* tuner adjustment requested...*/
+                int steps = (sync0x200 >> 4) & 0x00f;
+                if (steps & 0x008)
+                        steps = -steps;
+                dprintk("sp887x: implement tuner adjustment (%+i steps)!!\n",
+                       steps);
+        }
+
+        return 0;
+}
+
+static int sp887x_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        *ber = (sp887x_readreg(state, 0xc08) & 0x3f) |
+               (sp887x_readreg(state, 0xc07) << 6);
+        sp887x_writereg(state, 0xc08, 0x000);
+        sp887x_writereg(state, 0xc07, 0x000);
+        if (*ber >= 0x3fff0)
+                *ber = ~0;
+
+        return 0;
+}
+
+static int sp887x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        u16 snr12 = sp887x_readreg(state, 0xf16);
+        u32 signal = 3 * (snr12 << 4);
+        *strength = (signal < 0xffff) ? signal : 0xffff;
+
+        return 0;
+}
+
+static int sp887x_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        u16 snr12 = sp887x_readreg(state, 0xf16);
+        *snr = (snr12 << 4) | (snr12 >> 8);
+
+        return 0;
+}
+
+static int sp887x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        *ucblocks = sp887x_readreg(state, 0xc0c);
+        if (*ucblocks == 0xfff)
+                *ucblocks = ~0;
+
+        return 0;
+}
+
+static int sp887x_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        if (enable) {
+                return sp887x_writereg(state, 0x206, 0x001);
+        } else {
+                return sp887x_writereg(state, 0x206, 0x000);
+        }
+}
+
+static int sp887x_sleep(struct dvb_frontend* fe)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+
+        /* tristate TS output and disable interface pins */
+        sp887x_writereg(state, 0xc18, 0x000);
+
+        return 0;
+}
+
+static int sp887x_init(struct dvb_frontend* fe)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+        const struct firmware *fw = NULL;
+        int ret;
+
+        if (!state->initialised) {
+                /* request the firmware, this will block until someone uploads it */
+                printk("sp887x: waiting for firmware upload (%s)...\n", SP887X_DEFAULT_FIRMWARE);
+                ret = state->config->request_firmware(fe, &fw, SP887X_DEFAULT_FIRMWARE);
+                if (ret) {
+                        printk("sp887x: no firmware upload (timeout or file not found?)\n");
+                        return ret;
+                }
+
+                ret = sp887x_initial_setup(fe, fw);
+                release_firmware(fw);
+                if (ret) {
+                        printk("sp887x: writing firmware to device failed\n");
+                        return ret;
+                }
+                printk("sp887x: firmware upload complete\n");
+                state->initialised = 1;
+        }
+
+        /* enable TS output and interface pins */
+        sp887x_writereg(state, 0xc18, 0x00d);
+
+        return 0;
+}
+
+static int sp887x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
+{
+        fesettings->min_delay_ms = 350;
+        fesettings->step_size = 166666*2;
+        fesettings->max_drift = (166666*2)+1;
+        return 0;
+}
+
+static void sp887x_release(struct dvb_frontend* fe)
+{
+        struct sp887x_state* state = fe->demodulator_priv;
+        kfree(state);
+}
+
+static struct dvb_frontend_ops sp887x_ops;
+
+struct dvb_frontend* sp887x_attach(const struct sp887x_config* config,
+                                   struct i2c_adapter* i2c)
+{
+        struct sp887x_state* state = NULL;
+
+        /* allocate memory for the internal state */
+        state = kzalloc(sizeof(struct sp887x_state), GFP_KERNEL);
+        if (state == NULL) goto error;
+
+        /* setup the state */
+        state->config = config;
+        state->i2c = i2c;
+        state->initialised = 0;
+
+        /* check if the demod is there */
+        if (sp887x_readreg(state, 0x0200) < 0) goto error;
+
+        /* create dvb_frontend */
+        memcpy(&state->frontend.ops, &sp887x_ops, sizeof(struct dvb_frontend_ops));
+        state->frontend.demodulator_priv = state;
+        return &state->frontend;
+
+error:
+        kfree(state);
+        return NULL;
+}
+
+static struct dvb_frontend_ops sp887x_ops = {
+        .delsys = { SYS_DVBT },
+        .info = {
+                .name = "Spase SP887x DVB-T",
+                .frequency_min =  50500000,
+                .frequency_max = 858000000,
+                .frequency_stepsize = 166666,
+                .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+                        FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
+                        FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
+                        FE_CAN_RECOVER
+        },
+
+        .release = sp887x_release,
+
+        .init = sp887x_init,
+        .sleep = sp887x_sleep,
+        .i2c_gate_ctrl = sp887x_i2c_gate_ctrl,
+
+        .set_frontend = sp887x_setup_frontend_parameters,
+        .get_tune_settings = sp887x_get_tune_settings,
+
+        .read_status = sp887x_read_status,
+        .read_ber = sp887x_read_ber,
+        .read_signal_strength = sp887x_read_signal_strength,
+        .read_snr = sp887x_read_snr,
+        .read_ucblocks = sp887x_read_ucblocks,
+};
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Spase sp887x DVB-T demodulator driver");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(sp887x_attach);