[123/165] [media] DiBxxxx: get rid of DMA buffer on stack

From: Greg KH
Date: Wed Jun 01 2011 - 04:37:43 EST

2.6.39-stable review patch. If anyone has any objections, please let us know.

------------------
Content-Length: 37816
Lines: 1184

From: Olivier Grenie <olivier.grenie@xxxxxxxxx>

commit 5a0deeed5741117ee8625d6305d0034e219f102c upstream.

This patch removes the remaining on-stack buffer for USB DMA transfer.
This patch also reduces the stack memory usage.

Cc: Florian Mickler <florian@xxxxxxxxxxx>
Signed-off-by: Olivier Grenie <olivier.grenie@xxxxxxxxx>
Signed-off-by: Patrick Boettcher <patrick.boettcher@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/media/dvb/frontends/dib0070.c | 40 ++++--
drivers/media/dvb/frontends/dib0090.c | 71 ++++++++---
drivers/media/dvb/frontends/dib7000m.c | 47 ++++---
drivers/media/dvb/frontends/dib7000p.c | 72 ++++++++---
drivers/media/dvb/frontends/dib8000.c | 126 ++++++++++++++-----
drivers/media/dvb/frontends/dib9000.c | 172 +++++++++++++++++----------
drivers/media/dvb/frontends/dibx000_common.c | 113 ++++++++++-------
drivers/media/dvb/frontends/dibx000_common.h | 5
8 files changed, 444 insertions(+), 202 deletions(-)

--- a/drivers/media/dvb/frontends/dib0070.c
+++ b/drivers/media/dvb/frontends/dib0070.c
@@ -73,27 +73,47 @@ struct dib0070_state {

u8 wbd_gain_current;
u16 wbd_offset_3_3[2];
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[3];
+ u8 i2c_read_buffer[2];
};

static uint16_t dib0070_read_reg(struct dib0070_state *state, u8 reg)
{
- u8 b[2];
- struct i2c_msg msg[2] = {
- { .addr = state->cfg->i2c_address, .flags = 0, .buf = &reg, .len = 1 },
- { .addr = state->cfg->i2c_address, .flags = I2C_M_RD, .buf = b, .len = 2 },
- };
- if (i2c_transfer(state->i2c, msg, 2) != 2) {
+ state->i2c_write_buffer[0] = reg;
+
+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->cfg->i2c_address;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 1;
+ state->msg[1].addr = state->cfg->i2c_address;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = state->i2c_read_buffer;
+ state->msg[1].len = 2;
+
+ if (i2c_transfer(state->i2c, state->msg, 2) != 2) {
printk(KERN_WARNING "DiB0070 I2C read failed\n");
return 0;
}
- return (b[0] << 8) | b[1];
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static int dib0070_write_reg(struct dib0070_state *state, u8 reg, u16 val)
{
- u8 b[3] = { reg, val >> 8, val & 0xff };
- struct i2c_msg msg = { .addr = state->cfg->i2c_address, .flags = 0, .buf = b, .len = 3 };
- if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ state->i2c_write_buffer[0] = reg;
+ state->i2c_write_buffer[1] = val >> 8;
+ state->i2c_write_buffer[2] = val & 0xff;
+
+ memset(state->msg, 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->cfg->i2c_address;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 3;
+
+ if (i2c_transfer(state->i2c, state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0070 I2C write failed\n");
return -EREMOTEIO;
}
--- a/drivers/media/dvb/frontends/dib0090.c
+++ b/drivers/media/dvb/frontends/dib0090.c
@@ -191,6 +191,11 @@ struct dib0090_state {
u8 wbd_calibration_gain;
const struct dib0090_wbd_slope *current_wbd_table;
u16 wbdmux;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[3];
+ u8 i2c_read_buffer[2];
};

struct dib0090_fw_state {
@@ -198,27 +203,48 @@ struct dib0090_fw_state {
struct dvb_frontend *fe;
struct dib0090_identity identity;
const struct dib0090_config *config;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg;
+ u8 i2c_write_buffer[2];
+ u8 i2c_read_buffer[2];
};

static u16 dib0090_read_reg(struct dib0090_state *state, u8 reg)
{
- u8 b[2];
- struct i2c_msg msg[2] = {
- {.addr = state->config->i2c_address, .flags = 0, .buf = &reg, .len = 1},
- {.addr = state->config->i2c_address, .flags = I2C_M_RD, .buf = b, .len = 2},
- };
- if (i2c_transfer(state->i2c, msg, 2) != 2) {
+ state->i2c_write_buffer[0] = reg;
+
+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->config->i2c_address;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 1;
+ state->msg[1].addr = state->config->i2c_address;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = state->i2c_read_buffer;
+ state->msg[1].len = 2;
+
+ if (i2c_transfer(state->i2c, state->msg, 2) != 2) {
printk(KERN_WARNING "DiB0090 I2C read failed\n");
return 0;
}
- return (b[0] << 8) | b[1];
+
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static int dib0090_write_reg(struct dib0090_state *state, u32 reg, u16 val)
{
- u8 b[3] = { reg & 0xff, val >> 8, val & 0xff };
- struct i2c_msg msg = {.addr = state->config->i2c_address, .flags = 0, .buf = b, .len = 3 };
- if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ state->i2c_write_buffer[0] = reg & 0xff;
+ state->i2c_write_buffer[1] = val >> 8;
+ state->i2c_write_buffer[2] = val & 0xff;
+
+ memset(state->msg, 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->config->i2c_address;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 3;
+
+ if (i2c_transfer(state->i2c, state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C write failed\n");
return -EREMOTEIO;
}
@@ -227,20 +253,31 @@ static int dib0090_write_reg(struct dib0

static u16 dib0090_fw_read_reg(struct dib0090_fw_state *state, u8 reg)
{
- u8 b[2];
- struct i2c_msg msg = {.addr = reg, .flags = I2C_M_RD, .buf = b, .len = 2 };
- if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ state->i2c_write_buffer[0] = reg;
+
+ memset(&state->msg, 0, sizeof(struct i2c_msg));
+ state->msg.addr = reg;
+ state->msg.flags = I2C_M_RD;
+ state->msg.buf = state->i2c_read_buffer;
+ state->msg.len = 2;
+ if (i2c_transfer(state->i2c, &state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C read failed\n");
return 0;
}
- return (b[0] << 8) | b[1];
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static int dib0090_fw_write_reg(struct dib0090_fw_state *state, u8 reg, u16 val)
{
- u8 b[2] = { val >> 8, val & 0xff };
- struct i2c_msg msg = {.addr = reg, .flags = 0, .buf = b, .len = 2 };
- if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ state->i2c_write_buffer[0] = val >> 8;
+ state->i2c_write_buffer[1] = val & 0xff;
+
+ memset(&state->msg, 0, sizeof(struct i2c_msg));
+ state->msg.addr = reg;
+ state->msg.flags = 0;
+ state->msg.buf = state->i2c_write_buffer;
+ state->msg.len = 2;
+ if (i2c_transfer(state->i2c, &state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C write failed\n");
return -EREMOTEIO;
}
--- a/drivers/media/dvb/frontends/dib7000m.c
+++ b/drivers/media/dvb/frontends/dib7000m.c
@@ -50,6 +50,11 @@ struct dib7000m_state {
u16 revision;

u8 agc_state;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[4];
+ u8 i2c_read_buffer[2];
};

enum dib7000m_power_mode {
@@ -64,29 +69,39 @@ enum dib7000m_power_mode {

static u16 dib7000m_read_word(struct dib7000m_state *state, u16 reg)
{
- u8 wb[2] = { (reg >> 8) | 0x80, reg & 0xff };
- u8 rb[2];
- struct i2c_msg msg[2] = {
- { .addr = state->i2c_addr >> 1, .flags = 0, .buf = wb, .len = 2 },
- { .addr = state->i2c_addr >> 1, .flags = I2C_M_RD, .buf = rb, .len = 2 },
- };
+ state->i2c_write_buffer[0] = (reg >> 8) | 0x80;
+ state->i2c_write_buffer[1] = reg & 0xff;
+
+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 2;
+ state->msg[1].addr = state->i2c_addr >> 1;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = state->i2c_read_buffer;
+ state->msg[1].len = 2;

- if (i2c_transfer(state->i2c_adap, msg, 2) != 2)
+ if (i2c_transfer(state->i2c_adap, state->msg, 2) != 2)
dprintk("i2c read error on %d",reg);

- return (rb[0] << 8) | rb[1];
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static int dib7000m_write_word(struct dib7000m_state *state, u16 reg, u16 val)
{
- u8 b[4] = {
- (reg >> 8) & 0xff, reg & 0xff,
- (val >> 8) & 0xff, val & 0xff,
- };
- struct i2c_msg msg = {
- .addr = state->i2c_addr >> 1, .flags = 0, .buf = b, .len = 4
- };
- return i2c_transfer(state->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ state->i2c_write_buffer[1] = reg & 0xff;
+ state->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ state->i2c_write_buffer[3] = val & 0xff;
+
+ memset(&state->msg[0], 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 4;
+
+ return i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
}
static void dib7000m_write_tab(struct dib7000m_state *state, u16 *buf)
{
--- a/drivers/media/dvb/frontends/dib7000p.c
+++ b/drivers/media/dvb/frontends/dib7000p.c
@@ -63,6 +63,11 @@ struct dib7000p_state {

u16 tuner_enable;
struct i2c_adapter dib7090_tuner_adap;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[4];
+ u8 i2c_read_buffer[2];
};

enum dib7000p_power_mode {
@@ -76,29 +81,39 @@ static int dib7090_set_diversity_in(stru

static u16 dib7000p_read_word(struct dib7000p_state *state, u16 reg)
{
- u8 wb[2] = { reg >> 8, reg & 0xff };
- u8 rb[2];
- struct i2c_msg msg[2] = {
- {.addr = state->i2c_addr >> 1, .flags = 0, .buf = wb, .len = 2},
- {.addr = state->i2c_addr >> 1, .flags = I2C_M_RD, .buf = rb, .len = 2},
- };
+ state->i2c_write_buffer[0] = reg >> 8;
+ state->i2c_write_buffer[1] = reg & 0xff;
+
+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 2;
+ state->msg[1].addr = state->i2c_addr >> 1;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = state->i2c_read_buffer;
+ state->msg[1].len = 2;

- if (i2c_transfer(state->i2c_adap, msg, 2) != 2)
+ if (i2c_transfer(state->i2c_adap, state->msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (rb[0] << 8) | rb[1];
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static int dib7000p_write_word(struct dib7000p_state *state, u16 reg, u16 val)
{
- u8 b[4] = {
- (reg >> 8) & 0xff, reg & 0xff,
- (val >> 8) & 0xff, val & 0xff,
- };
- struct i2c_msg msg = {
- .addr = state->i2c_addr >> 1, .flags = 0, .buf = b, .len = 4
- };
- return i2c_transfer(state->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ state->i2c_write_buffer[1] = reg & 0xff;
+ state->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ state->i2c_write_buffer[3] = val & 0xff;
+
+ memset(&state->msg[0], 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 4;
+
+ return i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
}

static void dib7000p_write_tab(struct dib7000p_state *state, u16 * buf)
@@ -1550,11 +1565,24 @@ static void dib7000p_release(struct dvb_

int dib7000pc_detection(struct i2c_adapter *i2c_adap)
{
- u8 tx[2], rx[2];
+ u8 *tx, *rx;
struct i2c_msg msg[2] = {
- {.addr = 18 >> 1, .flags = 0, .buf = tx, .len = 2},
- {.addr = 18 >> 1, .flags = I2C_M_RD, .buf = rx, .len = 2},
+ {.addr = 18 >> 1, .flags = 0, .len = 2},
+ {.addr = 18 >> 1, .flags = I2C_M_RD, .len = 2},
};
+ int ret = 0;
+
+ tx = kzalloc(2*sizeof(u8), GFP_KERNEL);
+ if (!tx)
+ return -ENOMEM;
+ rx = kzalloc(2*sizeof(u8), GFP_KERNEL);
+ if (!rx) {
+ goto rx_memory_error;
+ ret = -ENOMEM;
+ }
+
+ msg[0].buf = tx;
+ msg[1].buf = rx;

tx[0] = 0x03;
tx[1] = 0x00;
@@ -1574,7 +1602,11 @@ int dib7000pc_detection(struct i2c_adapt
}

dprintk("-D- DiB7000PC not detected");
- return 0;
+
+ kfree(rx);
+rx_memory_error:
+ kfree(tx);
+ return ret;
}
EXPORT_SYMBOL(dib7000pc_detection);

--- a/drivers/media/dvb/frontends/dib8000.c
+++ b/drivers/media/dvb/frontends/dib8000.c
@@ -35,6 +35,8 @@ MODULE_PARM_DESC(debug, "turn on debuggi
struct i2c_device {
struct i2c_adapter *adap;
u8 addr;
+ u8 *i2c_write_buffer;
+ u8 *i2c_read_buffer;
};

struct dib8000_state {
@@ -70,6 +72,11 @@ struct dib8000_state {
u32 status;

struct dvb_frontend *fe[MAX_NUMBER_OF_FRONTENDS];
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[4];
+ u8 i2c_read_buffer[2];
};

enum dib8000_power_mode {
@@ -79,22 +86,41 @@ enum dib8000_power_mode {

static u16 dib8000_i2c_read16(struct i2c_device *i2c, u16 reg)
{
- u8 wb[2] = { reg >> 8, reg & 0xff };
- u8 rb[2];
struct i2c_msg msg[2] = {
- {.addr = i2c->addr >> 1,.flags = 0,.buf = wb,.len = 2},
- {.addr = i2c->addr >> 1,.flags = I2C_M_RD,.buf = rb,.len = 2},
+ {.addr = i2c->addr >> 1, .flags = 0,
+ .buf = i2c->i2c_write_buffer, .len = 2},
+ {.addr = i2c->addr >> 1, .flags = I2C_M_RD,
+ .buf = i2c->i2c_read_buffer, .len = 2},
};

+ msg[0].buf[0] = reg >> 8;
+ msg[0].buf[1] = reg & 0xff;
+
if (i2c_transfer(i2c->adap, msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (rb[0] << 8) | rb[1];
+ return (msg[1].buf[0] << 8) | msg[1].buf[1];
}

static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
{
- return dib8000_i2c_read16(&state->i2c, reg);
+ state->i2c_write_buffer[0] = reg >> 8;
+ state->i2c_write_buffer[1] = reg & 0xff;
+
+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c.addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 2;
+ state->msg[1].addr = state->i2c.addr >> 1;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = state->i2c_read_buffer;
+ state->msg[1].len = 2;
+
+ if (i2c_transfer(state->i2c.adap, state->msg, 2) != 2)
+ dprintk("i2c read error on %d", reg);
+
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static u32 dib8000_read32(struct dib8000_state *state, u16 reg)
@@ -109,19 +135,34 @@ static u32 dib8000_read32(struct dib8000

static int dib8000_i2c_write16(struct i2c_device *i2c, u16 reg, u16 val)
{
- u8 b[4] = {
- (reg >> 8) & 0xff, reg & 0xff,
- (val >> 8) & 0xff, val & 0xff,
- };
- struct i2c_msg msg = {
- .addr = i2c->addr >> 1,.flags = 0,.buf = b,.len = 4
- };
- return i2c_transfer(i2c->adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ struct i2c_msg msg = {.addr = i2c->addr >> 1, .flags = 0,
+ .buf = i2c->i2c_write_buffer, .len = 4};
+ int ret = 0;
+
+ msg.buf[0] = (reg >> 8) & 0xff;
+ msg.buf[1] = reg & 0xff;
+ msg.buf[2] = (val >> 8) & 0xff;
+ msg.buf[3] = val & 0xff;
+
+ ret = i2c_transfer(i2c->adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+
+ return ret;
}

static int dib8000_write_word(struct dib8000_state *state, u16 reg, u16 val)
{
- return dib8000_i2c_write16(&state->i2c, reg, val);
+ state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ state->i2c_write_buffer[1] = reg & 0xff;
+ state->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ state->i2c_write_buffer[3] = val & 0xff;
+
+ memset(&state->msg[0], 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c.addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 4;
+
+ return i2c_transfer(state->i2c.adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
}

static const s16 coeff_2k_sb_1seg_dqpsk[8] = {
@@ -980,30 +1021,31 @@ static void dib8000_update_timf(struct d
dprintk("Updated timing frequency: %d (default: %d)", state->timf, state->timf_default);
}

+static const u16 adc_target_16dB[11] = {
+ (1 << 13) - 825 - 117,
+ (1 << 13) - 837 - 117,
+ (1 << 13) - 811 - 117,
+ (1 << 13) - 766 - 117,
+ (1 << 13) - 737 - 117,
+ (1 << 13) - 693 - 117,
+ (1 << 13) - 648 - 117,
+ (1 << 13) - 619 - 117,
+ (1 << 13) - 575 - 117,
+ (1 << 13) - 531 - 117,
+ (1 << 13) - 501 - 117
+};
+static const u8 permu_seg[] = { 6, 5, 7, 4, 8, 3, 9, 2, 10, 1, 11, 0, 12 };
+
static void dib8000_set_channel(struct dib8000_state *state, u8 seq, u8 autosearching)
{
u16 mode, max_constellation, seg_diff_mask = 0, nbseg_diff = 0;
u8 guard, crate, constellation, timeI;
- u8 permu_seg[] = { 6, 5, 7, 4, 8, 3, 9, 2, 10, 1, 11, 0, 12 };
u16 i, coeff[4], P_cfr_left_edge = 0, P_cfr_right_edge = 0, seg_mask13 = 0x1fff; // All 13 segments enabled
const s16 *ncoeff = NULL, *ana_fe;
u16 tmcc_pow = 0;
u16 coff_pow = 0x2800;
u16 init_prbs = 0xfff;
u16 ana_gain = 0;
- u16 adc_target_16dB[11] = {
- (1 << 13) - 825 - 117,
- (1 << 13) - 837 - 117,
- (1 << 13) - 811 - 117,
- (1 << 13) - 766 - 117,
- (1 << 13) - 737 - 117,
- (1 << 13) - 693 - 117,
- (1 << 13) - 648 - 117,
- (1 << 13) - 619 - 117,
- (1 << 13) - 575 - 117,
- (1 << 13) - 531 - 117,
- (1 << 13) - 501 - 117
- };

if (state->ber_monitored_layer != LAYER_ALL)
dib8000_write_word(state, 285, (dib8000_read_word(state, 285) & 0x60) | state->ber_monitored_layer);
@@ -2379,10 +2421,22 @@ EXPORT_SYMBOL(dib8000_get_slave_frontend

int dib8000_i2c_enumeration(struct i2c_adapter *host, int no_of_demods, u8 default_addr, u8 first_addr)
{
- int k = 0;
+ int k = 0, ret = 0;
u8 new_addr = 0;
struct i2c_device client = {.adap = host };

+ client.i2c_write_buffer = kzalloc(4 * sizeof(u8), GFP_KERNEL);
+ if (!client.i2c_write_buffer) {
+ dprintk("%s: not enough memory", __func__);
+ return -ENOMEM;
+ }
+ client.i2c_read_buffer = kzalloc(4 * sizeof(u8), GFP_KERNEL);
+ if (!client.i2c_read_buffer) {
+ dprintk("%s: not enough memory", __func__);
+ ret = -ENOMEM;
+ goto error_memory;
+ }
+
for (k = no_of_demods - 1; k >= 0; k--) {
/* designated i2c address */
new_addr = first_addr + (k << 1);
@@ -2394,7 +2448,8 @@ int dib8000_i2c_enumeration(struct i2c_a
client.addr = default_addr;
if (dib8000_identify(&client) == 0) {
dprintk("#%d: not identified", k);
- return -EINVAL;
+ ret = -EINVAL;
+ goto error;
}
}

@@ -2420,7 +2475,12 @@ int dib8000_i2c_enumeration(struct i2c_a
dib8000_i2c_write16(&client, 1286, 0);
}

- return 0;
+error:
+ kfree(client.i2c_read_buffer);
+error_memory:
+ kfree(client.i2c_write_buffer);
+
+ return ret;
}

EXPORT_SYMBOL(dib8000_i2c_enumeration);
@@ -2519,6 +2579,8 @@ struct dvb_frontend *dib8000_attach(stru
memcpy(&state->cfg, cfg, sizeof(struct dib8000_config));
state->i2c.adap = i2c_adap;
state->i2c.addr = i2c_addr;
+ state->i2c.i2c_write_buffer = state->i2c_write_buffer;
+ state->i2c.i2c_read_buffer = state->i2c_read_buffer;
state->gpio_val = cfg->gpio_val;
state->gpio_dir = cfg->gpio_dir;

--- a/drivers/media/dvb/frontends/dib9000.c
+++ b/drivers/media/dvb/frontends/dib9000.c
@@ -27,6 +27,8 @@ MODULE_PARM_DESC(debug, "turn on debuggi
struct i2c_device {
struct i2c_adapter *i2c_adap;
u8 i2c_addr;
+ u8 *i2c_read_buffer;
+ u8 *i2c_write_buffer;
};

/* lock */
@@ -92,11 +94,16 @@ struct dib9000_state {

struct dvb_frontend *fe[MAX_NUMBER_OF_FRONTENDS];
u16 component_bus_speed;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[2];
+ u8 i2c_write_buffer[255];
+ u8 i2c_read_buffer[255];
};

-u32 fe_info[44] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+static const u32 fe_info[44] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0
+ 0, 0, 0, 0, 0, 0, 0, 0
};

enum dib9000_power_mode {
@@ -217,25 +224,33 @@ static u16 dib9000_read16_attr(struct di
u32 chunk_size = 126;
u32 l;
int ret;
- u8 wb[2] = { reg >> 8, reg & 0xff };
- struct i2c_msg msg[2] = {
- {.addr = state->i2c.i2c_addr >> 1, .flags = 0, .buf = wb, .len = 2},
- {.addr = state->i2c.i2c_addr >> 1, .flags = I2C_M_RD, .buf = b, .len = len},
- };

if (state->platform.risc.fw_is_running && (reg < 1024))
return dib9000_risc_apb_access_read(state, reg, attribute, NULL, 0, b, len);

+ memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c.i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = 2;
+ state->msg[1].addr = state->i2c.i2c_addr >> 1;
+ state->msg[1].flags = I2C_M_RD;
+ state->msg[1].buf = b;
+ state->msg[1].len = len;
+
+ state->i2c_write_buffer[0] = reg >> 8;
+ state->i2c_write_buffer[1] = reg & 0xff;
+
if (attribute & DATA_BUS_ACCESS_MODE_8BIT)
- wb[0] |= (1 << 5);
+ state->i2c_write_buffer[0] |= (1 << 5);
if (attribute & DATA_BUS_ACCESS_MODE_NO_ADDRESS_INCREMENT)
- wb[0] |= (1 << 4);
+ state->i2c_write_buffer[0] |= (1 << 4);

do {
l = len < chunk_size ? len : chunk_size;
- msg[1].len = l;
- msg[1].buf = b;
- ret = i2c_transfer(state->i2c.i2c_adap, msg, 2) != 2 ? -EREMOTEIO : 0;
+ state->msg[1].len = l;
+ state->msg[1].buf = b;
+ ret = i2c_transfer(state->i2c.i2c_adap, state->msg, 2) != 2 ? -EREMOTEIO : 0;
if (ret != 0) {
dprintk("i2c read error on %d", reg);
return -EREMOTEIO;
@@ -253,50 +268,47 @@ static u16 dib9000_read16_attr(struct di

static u16 dib9000_i2c_read16(struct i2c_device *i2c, u16 reg)
{
- u8 b[2];
- u8 wb[2] = { reg >> 8, reg & 0xff };
struct i2c_msg msg[2] = {
- {.addr = i2c->i2c_addr >> 1, .flags = 0, .buf = wb, .len = 2},
- {.addr = i2c->i2c_addr >> 1, .flags = I2C_M_RD, .buf = b, .len = 2},
+ {.addr = i2c->i2c_addr >> 1, .flags = 0,
+ .buf = i2c->i2c_write_buffer, .len = 2},
+ {.addr = i2c->i2c_addr >> 1, .flags = I2C_M_RD,
+ .buf = i2c->i2c_read_buffer, .len = 2},
};

+ i2c->i2c_write_buffer[0] = reg >> 8;
+ i2c->i2c_write_buffer[1] = reg & 0xff;
+
if (i2c_transfer(i2c->i2c_adap, msg, 2) != 2) {
dprintk("read register %x error", reg);
return 0;
}

- return (b[0] << 8) | b[1];
+ return (i2c->i2c_read_buffer[0] << 8) | i2c->i2c_read_buffer[1];
}

static inline u16 dib9000_read_word(struct dib9000_state *state, u16 reg)
{
- u8 b[2];
- if (dib9000_read16_attr(state, reg, b, 2, 0) != 0)
+ if (dib9000_read16_attr(state, reg, state->i2c_read_buffer, 2, 0) != 0)
return 0;
- return (b[0] << 8 | b[1]);
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

static inline u16 dib9000_read_word_attr(struct dib9000_state *state, u16 reg, u16 attribute)
{
- u8 b[2];
- if (dib9000_read16_attr(state, reg, b, 2, attribute) != 0)
+ if (dib9000_read16_attr(state, reg, state->i2c_read_buffer, 2,
+ attribute) != 0)
return 0;
- return (b[0] << 8 | b[1]);
+ return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
}

#define dib9000_read16_noinc_attr(state, reg, b, len, attribute) dib9000_read16_attr(state, reg, b, len, (attribute) | DATA_BUS_ACCESS_MODE_NO_ADDRESS_INCREMENT)

static u16 dib9000_write16_attr(struct dib9000_state *state, u16 reg, const u8 * buf, u32 len, u16 attribute)
{
- u8 b[255];
u32 chunk_size = 126;
u32 l;
int ret;

- struct i2c_msg msg = {
- .addr = state->i2c.i2c_addr >> 1, .flags = 0, .buf = b, .len = len + 2
- };
-
if (state->platform.risc.fw_is_running && (reg < 1024)) {
if (dib9000_risc_apb_access_write
(state, reg, DATA_BUS_ACCESS_MODE_16BIT | DATA_BUS_ACCESS_MODE_NO_ADDRESS_INCREMENT | attribute, buf, len) != 0)
@@ -304,20 +316,26 @@ static u16 dib9000_write16_attr(struct d
return 0;
}

- b[0] = (reg >> 8) & 0xff;
- b[1] = (reg) & 0xff;
+ memset(&state->msg[0], 0, sizeof(struct i2c_msg));
+ state->msg[0].addr = state->i2c.i2c_addr >> 1;
+ state->msg[0].flags = 0;
+ state->msg[0].buf = state->i2c_write_buffer;
+ state->msg[0].len = len + 2;
+
+ state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ state->i2c_write_buffer[1] = (reg) & 0xff;

if (attribute & DATA_BUS_ACCESS_MODE_8BIT)
- b[0] |= (1 << 5);
+ state->i2c_write_buffer[0] |= (1 << 5);
if (attribute & DATA_BUS_ACCESS_MODE_NO_ADDRESS_INCREMENT)
- b[0] |= (1 << 4);
+ state->i2c_write_buffer[0] |= (1 << 4);

do {
l = len < chunk_size ? len : chunk_size;
- msg.len = l + 2;
- memcpy(&b[2], buf, l);
+ state->msg[0].len = l + 2;
+ memcpy(&state->i2c_write_buffer[2], buf, l);

- ret = i2c_transfer(state->i2c.i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ ret = i2c_transfer(state->i2c.i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;

buf += l;
len -= l;
@@ -331,11 +349,16 @@ static u16 dib9000_write16_attr(struct d

static int dib9000_i2c_write16(struct i2c_device *i2c, u16 reg, u16 val)
{
- u8 b[4] = { (reg >> 8) & 0xff, reg & 0xff, (val >> 8) & 0xff, val & 0xff };
struct i2c_msg msg = {
- .addr = i2c->i2c_addr >> 1, .flags = 0, .buf = b, .len = 4
+ .addr = i2c->i2c_addr >> 1, .flags = 0,
+ .buf = i2c->i2c_write_buffer, .len = 4
};

+ i2c->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ i2c->i2c_write_buffer[1] = reg & 0xff;
+ i2c->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ i2c->i2c_write_buffer[3] = val & 0xff;
+
return i2c_transfer(i2c->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
}

@@ -1015,8 +1038,8 @@ static int dib9000_fw_memmbx_sync(struct
return 0;
dib9000_risc_mem_write(state, FE_MM_RW_SYNC, &i);
do {
- dib9000_risc_mem_read(state, FE_MM_RW_SYNC, &i, 1);
- } while (i && index_loop--);
+ dib9000_risc_mem_read(state, FE_MM_RW_SYNC, state->i2c_read_buffer, 1);
+ } while (state->i2c_read_buffer[0] && index_loop--);

if (index_loop > 0)
return 0;
@@ -1139,7 +1162,7 @@ static int dib9000_fw_get_channel(struct

s8 intlv_native;
};
- struct dibDVBTChannel ch;
+ struct dibDVBTChannel *ch;
int ret = 0;

DibAcquireLock(&state->platform.risc.mem_mbx_lock);
@@ -1148,9 +1171,12 @@ static int dib9000_fw_get_channel(struct
ret = -EIO;
}

- dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_UNION, (u8 *) &ch, sizeof(struct dibDVBTChannel));
+ dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_UNION,
+ state->i2c_read_buffer, sizeof(struct dibDVBTChannel));
+ ch = (struct dibDVBTChannel *)state->i2c_read_buffer;
+

- switch (ch.spectrum_inversion & 0x7) {
+ switch (ch->spectrum_inversion & 0x7) {
case 1:
state->fe[0]->dtv_property_cache.inversion = INVERSION_ON;
break;
@@ -1162,7 +1188,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.inversion = INVERSION_AUTO;
break;
}
- switch (ch.nfft) {
+ switch (ch->nfft) {
case 0:
state->fe[0]->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_2K;
break;
@@ -1177,7 +1203,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_AUTO;
break;
}
- switch (ch.guard) {
+ switch (ch->guard) {
case 0:
state->fe[0]->dtv_property_cache.guard_interval = GUARD_INTERVAL_1_32;
break;
@@ -1195,7 +1221,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.guard_interval = GUARD_INTERVAL_AUTO;
break;
}
- switch (ch.constellation) {
+ switch (ch->constellation) {
case 2:
state->fe[0]->dtv_property_cache.modulation = QAM_64;
break;
@@ -1210,7 +1236,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.modulation = QAM_AUTO;
break;
}
- switch (ch.hrch) {
+ switch (ch->hrch) {
case 0:
state->fe[0]->dtv_property_cache.hierarchy = HIERARCHY_NONE;
break;
@@ -1222,7 +1248,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.hierarchy = HIERARCHY_AUTO;
break;
}
- switch (ch.code_rate_hp) {
+ switch (ch->code_rate_hp) {
case 1:
state->fe[0]->dtv_property_cache.code_rate_HP = FEC_1_2;
break;
@@ -1243,7 +1269,7 @@ static int dib9000_fw_get_channel(struct
state->fe[0]->dtv_property_cache.code_rate_HP = FEC_AUTO;
break;
}
- switch (ch.code_rate_lp) {
+ switch (ch->code_rate_lp) {
case 1:
state->fe[0]->dtv_property_cache.code_rate_LP = FEC_1_2;
break;
@@ -1439,9 +1465,10 @@ static int dib9000_fw_tune(struct dvb_fr
break;
case CT_DEMOD_STEP_1:
if (search)
- dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_SEARCH_STATE, (u8 *) &i, 1);
+ dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_SEARCH_STATE, state->i2c_read_buffer, 1);
else
- dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_TUNE_STATE, (u8 *) &i, 1);
+ dib9000_risc_mem_read(state, FE_MM_R_CHANNEL_TUNE_STATE, state->i2c_read_buffer, 1);
+ i = (s8)state->i2c_read_buffer[0];
switch (i) { /* something happened */
case 0:
break;
@@ -2038,14 +2065,17 @@ static int dib9000_read_status(struct dv
static int dib9000_read_ber(struct dvb_frontend *fe, u32 * ber)
{
struct dib9000_state *state = fe->demodulator_priv;
- u16 c[16];
+ u16 *c;

DibAcquireLock(&state->platform.risc.mem_mbx_lock);
if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
return -EIO;
- dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, sizeof(c));
+ dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR,
+ state->i2c_read_buffer, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

+ c = (u16 *)state->i2c_read_buffer;
+
*ber = c[10] << 16 | c[11];
return 0;
}
@@ -2054,7 +2084,7 @@ static int dib9000_read_signal_strength(
{
struct dib9000_state *state = fe->demodulator_priv;
u8 index_frontend;
- u16 c[16];
+ u16 *c = (u16 *)state->i2c_read_buffer;
u16 val;

*strength = 0;
@@ -2069,7 +2099,7 @@ static int dib9000_read_signal_strength(
DibAcquireLock(&state->platform.risc.mem_mbx_lock);
if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
return -EIO;
- dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, sizeof(c));
+ dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

val = 65535 - c[4];
@@ -2083,14 +2113,14 @@ static int dib9000_read_signal_strength(
static u32 dib9000_get_snr(struct dvb_frontend *fe)
{
struct dib9000_state *state = fe->demodulator_priv;
- u16 c[16];
+ u16 *c = (u16 *)state->i2c_read_buffer;
u32 n, s, exp;
u16 val;

DibAcquireLock(&state->platform.risc.mem_mbx_lock);
if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
return -EIO;
- dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, sizeof(c));
+ dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

val = c[7];
@@ -2137,12 +2167,12 @@ static int dib9000_read_snr(struct dvb_f
static int dib9000_read_unc_blocks(struct dvb_frontend *fe, u32 * unc)
{
struct dib9000_state *state = fe->demodulator_priv;
- u16 c[16];
+ u16 *c = (u16 *)state->i2c_read_buffer;

DibAcquireLock(&state->platform.risc.mem_mbx_lock);
if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
return -EIO;
- dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, sizeof(c));
+ dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

*unc = c[12];
@@ -2151,10 +2181,22 @@ static int dib9000_read_unc_blocks(struc

int dib9000_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, u8 first_addr)
{
- int k = 0;
+ int k = 0, ret = 0;
u8 new_addr = 0;
struct i2c_device client = {.i2c_adap = i2c };

+ client.i2c_write_buffer = kzalloc(4 * sizeof(u8), GFP_KERNEL);
+ if (!client.i2c_write_buffer) {
+ dprintk("%s: not enough memory", __func__);
+ return -ENOMEM;
+ }
+ client.i2c_read_buffer = kzalloc(4 * sizeof(u8), GFP_KERNEL);
+ if (!client.i2c_read_buffer) {
+ dprintk("%s: not enough memory", __func__);
+ ret = -ENOMEM;
+ goto error_memory;
+ }
+
client.i2c_addr = default_addr + 16;
dib9000_i2c_write16(&client, 1796, 0x0);

@@ -2178,7 +2220,8 @@ int dib9000_i2c_enumeration(struct i2c_a
client.i2c_addr = default_addr;
if (dib9000_identify(&client) == 0) {
dprintk("DiB9000 #%d: not identified", k);
- return -EIO;
+ ret = -EIO;
+ goto error;
}
}

@@ -2196,7 +2239,12 @@ int dib9000_i2c_enumeration(struct i2c_a
dib9000_i2c_write16(&client, 1795, 0);
}

- return 0;
+error:
+ kfree(client.i2c_read_buffer);
+error_memory:
+ kfree(client.i2c_write_buffer);
+
+ return ret;
}
EXPORT_SYMBOL(dib9000_i2c_enumeration);

@@ -2261,6 +2309,8 @@ struct dvb_frontend *dib9000_attach(stru
memcpy(&st->chip.d9.cfg, cfg, sizeof(struct dib9000_config));
st->i2c.i2c_adap = i2c_adap;
st->i2c.i2c_addr = i2c_addr;
+ st->i2c.i2c_write_buffer = st->i2c_write_buffer;
+ st->i2c.i2c_read_buffer = st->i2c_read_buffer;

st->gpio_dir = DIB9000_GPIO_DEFAULT_DIRECTIONS;
st->gpio_val = DIB9000_GPIO_DEFAULT_VALUES;
--- a/drivers/media/dvb/frontends/dibx000_common.c
+++ b/drivers/media/dvb/frontends/dibx000_common.c
@@ -10,30 +10,39 @@ MODULE_PARM_DESC(debug, "turn on debuggi

static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
{
- u8 b[4] = {
- (reg >> 8) & 0xff, reg & 0xff,
- (val >> 8) & 0xff, val & 0xff,
- };
- struct i2c_msg msg = {
- .addr = mst->i2c_addr,.flags = 0,.buf = b,.len = 4
- };
+ mst->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ mst->i2c_write_buffer[1] = reg & 0xff;
+ mst->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ mst->i2c_write_buffer[3] = val & 0xff;
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg));
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 4;

- return i2c_transfer(mst->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ return i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0;
}

static u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg)
{
- u8 wb[2] = { reg >> 8, reg & 0xff };
- u8 rb[2];
- struct i2c_msg msg[2] = {
- {.addr = mst->i2c_addr, .flags = 0, .buf = wb, .len = 2},
- {.addr = mst->i2c_addr, .flags = I2C_M_RD, .buf = rb, .len = 2},
- };
+ mst->i2c_write_buffer[0] = reg >> 8;
+ mst->i2c_write_buffer[1] = reg & 0xff;

- if (i2c_transfer(mst->i2c_adap, msg, 2) != 2)
+ memset(mst->msg, 0, 2 * sizeof(struct i2c_msg));
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 2;
+ mst->msg[1].addr = mst->i2c_addr;
+ mst->msg[1].flags = I2C_M_RD;
+ mst->msg[1].buf = mst->i2c_read_buffer;
+ mst->msg[1].len = 2;
+
+ if (i2c_transfer(mst->i2c_adap, mst->msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (rb[0] << 8) | rb[1];
+ return (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1];
}

static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst)
@@ -248,26 +257,32 @@ static int dibx000_i2c_gated_gpio67_xfer
struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
- struct i2c_msg m[2 + num];
- u8 tx_open[4], tx_close[4];

- memset(m, 0, sizeof(struct i2c_msg) * (2 + num));
+ if (num > 32) {
+ dprintk("%s: too much I2C message to be transmitted (%i).\
+ Maximum is 32", __func__, num);
+ return -ENOMEM;
+ }
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));

dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_6_7);

- dibx000_i2c_gate_ctrl(mst, tx_open, msg[0].addr, 1);
- m[0].addr = mst->i2c_addr;
- m[0].buf = tx_open;
- m[0].len = 4;
-
- memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);
-
- dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
- m[num + 1].addr = mst->i2c_addr;
- m[num + 1].buf = tx_close;
- m[num + 1].len = 4;
+ /* open the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].buf = &mst->i2c_write_buffer[0];
+ mst->msg[0].len = 4;
+
+ memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
+
+ /* close the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
+ mst->msg[num + 1].addr = mst->i2c_addr;
+ mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
+ mst->msg[num + 1].len = 4;

- return i2c_transfer(mst->i2c_adap, m, 2 + num) == 2 + num ? num : -EIO;
+ return i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? num : -EIO;
}

static struct i2c_algorithm dibx000_i2c_gated_gpio67_algo = {
@@ -279,26 +294,32 @@ static int dibx000_i2c_gated_tuner_xfer(
struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
- struct i2c_msg m[2 + num];
- u8 tx_open[4], tx_close[4];

- memset(m, 0, sizeof(struct i2c_msg) * (2 + num));
+ if (num > 32) {
+ dprintk("%s: too much I2C message to be transmitted (%i).\
+ Maximum is 32", __func__, num);
+ return -ENOMEM;
+ }
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));

dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);

- dibx000_i2c_gate_ctrl(mst, tx_open, msg[0].addr, 1);
- m[0].addr = mst->i2c_addr;
- m[0].buf = tx_open;
- m[0].len = 4;
-
- memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);
-
- dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
- m[num + 1].addr = mst->i2c_addr;
- m[num + 1].buf = tx_close;
- m[num + 1].len = 4;
+ /* open the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].buf = &mst->i2c_write_buffer[0];
+ mst->msg[0].len = 4;
+
+ memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
+
+ /* close the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
+ mst->msg[num + 1].addr = mst->i2c_addr;
+ mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
+ mst->msg[num + 1].len = 4;

- return i2c_transfer(mst->i2c_adap, m, 2 + num) == 2 + num ? num : -EIO;
+ return i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? num : -EIO;
}

static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
--- a/drivers/media/dvb/frontends/dibx000_common.h
+++ b/drivers/media/dvb/frontends/dibx000_common.h
@@ -28,6 +28,11 @@ struct dibx000_i2c_master {
u8 i2c_addr;

u16 base_reg;
+
+ /* for the I2C transfer */
+ struct i2c_msg msg[34];
+ u8 i2c_write_buffer[8];
+ u8 i2c_read_buffer[2];
};

extern int dibx000_init_i2c_master(struct dibx000_i2c_master *mst,


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