diff options
Diffstat (limited to 'drivers/media/dvb-frontends/ix2505v.c')
| -rw-r--r-- | drivers/media/dvb-frontends/ix2505v.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/ix2505v.c b/drivers/media/dvb-frontends/ix2505v.c new file mode 100644 index 000000000..a30707b61 --- /dev/null +++ b/drivers/media/dvb-frontends/ix2505v.c @@ -0,0 +1,320 @@ +/* + * Driver for Sharp IX2505V (marked B0017) DVB-S silicon tuner + * + * Copyright (C) 2010 Malcolm Priestley + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License Version 2, as + * published by the Free Software Foundation. + * + * 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 <linux/module.h> +#include <linux/dvb/frontend.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include "ix2505v.h" + +static int ix2505v_debug; +#define dprintk(level, args...) do { \ + if (ix2505v_debug & level) \ + printk(KERN_DEBUG "ix2505v: " args); \ +} while (0) + +#define deb_info(args...) dprintk(0x01, args) +#define deb_i2c(args...) dprintk(0x02, args) + +struct ix2505v_state { + struct i2c_adapter *i2c; + const struct ix2505v_config *config; + u32 frequency; +}; + +/* + * Data read format of the Sharp IX2505V B0017 + * + * byte1: 1 | 1 | 0 | 0 | 0 | MA1 | MA0 | 1 + * byte2: POR | FL | RD2 | RD1 | RD0 | X | X | X + * + * byte1 = address + * byte2; + * POR = Power on Reset (VCC H=<2.2v L=>2.2v) + * FL = Phase Lock (H=lock L=unlock) + * RD0-2 = Reserved internal operations + * + * Only POR can be used to check the tuner is present + * + * Caution: after byte2 the I2C reverts to write mode continuing to read + * may corrupt tuning data. + * + */ + +static int ix2505v_read_status_reg(struct ix2505v_state *state) +{ + u8 addr = state->config->tuner_address; + u8 b2[] = {0}; + int ret; + + struct i2c_msg msg[1] = { + { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } + }; + + ret = i2c_transfer(state->i2c, msg, 1); + deb_i2c("Read %s ", __func__); + + return (ret == 1) ? (int) b2[0] : -1; +} + +static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count) +{ + struct i2c_msg msg[1] = { + { .addr = state->config->tuner_address, .flags = 0, + .buf = buf, .len = count }, + }; + + int ret; + + ret = i2c_transfer(state->i2c, msg, 1); + + if (ret != 1) { + deb_i2c("%s: i2c error, ret=%d\n", __func__, ret); + return -EIO; + } + + return 0; +} + +static void ix2505v_release(struct dvb_frontend *fe) +{ + struct ix2505v_state *state = fe->tuner_priv; + + fe->tuner_priv = NULL; + kfree(state); + +} + +/* + * Data write format of the Sharp IX2505V B0017 + * + * byte1: 1 | 1 | 0 | 0 | 0 | 0(MA1)| 0(MA0)| 0 + * byte2: 0 | BG1 | BG2 | N8 | N7 | N6 | N5 | N4 + * byte3: N3 | N2 | N1 | A5 | A4 | A3 | A2 | A1 + * byte4: 1 | 1(C1) | 1(C0) | PD5 | PD4 | TM | 0(RTS)| 1(REF) + * byte5: BA2 | BA1 | BA0 | PSC | PD3 |PD2/TS2|DIV/TS1|PD0/TS0 + * + * byte1 = address + * + * Write order + * 1) byte1 -> byte2 -> byte3 -> byte4 -> byte5 + * 2) byte1 -> byte4 -> byte5 -> byte2 -> byte3 + * 3) byte1 -> byte2 -> byte3 -> byte4 + * 4) byte1 -> byte4 -> byte5 -> byte2 + * 5) byte1 -> byte2 -> byte3 + * 6) byte1 -> byte4 -> byte5 + * 7) byte1 -> byte2 + * 8) byte1 -> byte4 + * + * Recommended Setup + * 1 -> 8 -> 6 + */ + +static int ix2505v_set_params(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct ix2505v_state *state = fe->tuner_priv; + u32 frequency = c->frequency; + u32 b_w = (c->symbol_rate * 27) / 32000; + u32 div_factor, N , A, x; + int ret = 0, len; + u8 gain, cc, ref, psc, local_osc, lpf; + u8 data[4] = {0}; + + if ((frequency < fe->ops.info.frequency_min_hz / kHz) + || (frequency > fe->ops.info.frequency_max_hz / kHz)) + return -EINVAL; + + if (state->config->tuner_gain) + gain = (state->config->tuner_gain < 4) + ? state->config->tuner_gain : 0; + else + gain = 0x0; + + if (state->config->tuner_chargepump) + cc = state->config->tuner_chargepump; + else + cc = 0x3; + + ref = 8; /* REF =1 */ + psc = 32; /* PSC = 0 */ + + div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */ + x = div_factor / psc; + N = x/100; + A = ((x - (N * 100)) * psc) / 100; + + data[0] = ((gain & 0x3) << 5) | (N >> 3); + data[1] = (N << 5) | (A & 0x1f); + data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/ + + deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A); + + if (frequency <= 1065000) + local_osc = (6 << 5) | 2; + else if (frequency <= 1170000) + local_osc = (7 << 5) | 2; + else if (frequency <= 1300000) + local_osc = (1 << 5); + else if (frequency <= 1445000) + local_osc = (2 << 5); + else if (frequency <= 1607000) + local_osc = (3 << 5); + else if (frequency <= 1778000) + local_osc = (4 << 5); + else if (frequency <= 1942000) + local_osc = (5 << 5); + else /*frequency up to 2150000*/ + local_osc = (6 << 5); + + data[3] = local_osc; /* all other bits set 0 */ + + if (b_w <= 10000) + lpf = 0xc; + else if (b_w <= 12000) + lpf = 0x2; + else if (b_w <= 14000) + lpf = 0xa; + else if (b_w <= 16000) + lpf = 0x6; + else if (b_w <= 18000) + lpf = 0xe; + else if (b_w <= 20000) + lpf = 0x1; + else if (b_w <= 22000) + lpf = 0x9; + else if (b_w <= 24000) + lpf = 0x5; + else if (b_w <= 26000) + lpf = 0xd; + else if (b_w <= 28000) + lpf = 0x3; + else + lpf = 0xb; + + deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf); + deb_info("Data 0=[%4phN]\n", data); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + len = sizeof(data); + ret |= ix2505v_write(state, data, len); + + data[2] |= 0x4; /* set TM = 1 other bits same */ + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + len = 1; + ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */ + + msleep(10); + + data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */ + data[3] |= (lpf & 0x3) << 2; + + deb_info("Data 2=[%x%x]\n", data[2], data[3]); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + len = 2; + ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */ + + if (state->config->min_delay_ms) + msleep(state->config->min_delay_ms); + + state->frequency = frequency; + + return ret; +} + +static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct ix2505v_state *state = fe->tuner_priv; + + *frequency = state->frequency; + + return 0; +} + +static const struct dvb_tuner_ops ix2505v_tuner_ops = { + .info = { + .name = "Sharp IX2505V (B0017)", + .frequency_min_hz = 950 * MHz, + .frequency_max_hz = 2175 * MHz + }, + .release = ix2505v_release, + .set_params = ix2505v_set_params, + .get_frequency = ix2505v_get_frequency, +}; + +struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe, + const struct ix2505v_config *config, + struct i2c_adapter *i2c) +{ + struct ix2505v_state *state = NULL; + int ret; + + if (NULL == config) { + deb_i2c("%s: no config ", __func__); + goto error; + } + + state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL); + if (NULL == state) + return NULL; + + state->config = config; + state->i2c = i2c; + + if (state->config->tuner_write_only) { + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + ret = ix2505v_read_status_reg(state); + + if (ret & 0x80) { + deb_i2c("%s: No IX2505V found\n", __func__); + goto error; + } + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + } + + fe->tuner_priv = state; + + memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops, + sizeof(struct dvb_tuner_ops)); + deb_i2c("%s: initialization (%s addr=0x%02x) ok\n", + __func__, fe->ops.tuner_ops.info.name, config->tuner_address); + + return fe; + +error: + kfree(state); + return NULL; +} +EXPORT_SYMBOL(ix2505v_attach); + +module_param_named(debug, ix2505v_debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); +MODULE_DESCRIPTION("DVB IX2505V tuner driver"); +MODULE_AUTHOR("Malcolm Priestley"); +MODULE_LICENSE("GPL"); |