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path: root/drivers/media/dvb-frontends/isl6423.c
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Diffstat (limited to 'drivers/media/dvb-frontends/isl6423.c')
-rw-r--r--drivers/media/dvb-frontends/isl6423.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/isl6423.c b/drivers/media/dvb-frontends/isl6423.c
new file mode 100644
index 000000000..a0d0a3834
--- /dev/null
+++ b/drivers/media/dvb-frontends/isl6423.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ Intersil ISL6423 SEC and LNB Power supply controller
+
+ Copyright (C) Manu Abraham <abraham.manu@gmail.com>
+
+*/
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <media/dvb_frontend.h>
+#include "isl6423.h"
+
+static unsigned int verbose;
+module_param(verbose, int, 0644);
+MODULE_PARM_DESC(verbose, "Set Verbosity level");
+
+#define FE_ERROR 0
+#define FE_NOTICE 1
+#define FE_INFO 2
+#define FE_DEBUG 3
+#define FE_DEBUGREG 4
+
+#define dprintk(__y, __z, format, arg...) do { \
+ if (__z) { \
+ if ((verbose > FE_ERROR) && (verbose > __y)) \
+ printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \
+ else if ((verbose > FE_NOTICE) && (verbose > __y)) \
+ printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \
+ else if ((verbose > FE_INFO) && (verbose > __y)) \
+ printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \
+ else if ((verbose > FE_DEBUG) && (verbose > __y)) \
+ printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \
+ } else { \
+ if (verbose > __y) \
+ printk(format, ##arg); \
+ } \
+} while (0)
+
+struct isl6423_dev {
+ const struct isl6423_config *config;
+ struct i2c_adapter *i2c;
+
+ u8 reg_3;
+ u8 reg_4;
+
+ unsigned int verbose;
+};
+
+static int isl6423_write(struct isl6423_dev *isl6423, u8 reg)
+{
+ struct i2c_adapter *i2c = isl6423->i2c;
+ u8 addr = isl6423->config->addr;
+ int err = 0;
+
+ struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = &reg, .len = 1 };
+
+ dprintk(FE_DEBUG, 1, "write reg %02X", reg);
+ err = i2c_transfer(i2c, &msg, 1);
+ if (err < 0)
+ goto exit;
+ return 0;
+
+exit:
+ dprintk(FE_ERROR, 1, "I/O error <%d>", err);
+ return err;
+}
+
+static int isl6423_set_modulation(struct dvb_frontend *fe)
+{
+ struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
+ const struct isl6423_config *config = isl6423->config;
+ int err = 0;
+ u8 reg_2 = 0;
+
+ reg_2 = 0x01 << 5;
+
+ if (config->mod_extern)
+ reg_2 |= (1 << 3);
+ else
+ reg_2 |= (1 << 4);
+
+ err = isl6423_write(isl6423, reg_2);
+ if (err < 0)
+ goto exit;
+ return 0;
+
+exit:
+ dprintk(FE_ERROR, 1, "I/O error <%d>", err);
+ return err;
+}
+
+static int isl6423_voltage_boost(struct dvb_frontend *fe, long arg)
+{
+ struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
+ u8 reg_3 = isl6423->reg_3;
+ u8 reg_4 = isl6423->reg_4;
+ int err = 0;
+
+ if (arg) {
+ /* EN = 1, VSPEN = 1, VBOT = 1 */
+ reg_4 |= (1 << 4);
+ reg_4 |= 0x1;
+ reg_3 |= (1 << 3);
+ } else {
+ /* EN = 1, VSPEN = 1, VBOT = 0 */
+ reg_4 |= (1 << 4);
+ reg_4 &= ~0x1;
+ reg_3 |= (1 << 3);
+ }
+ err = isl6423_write(isl6423, reg_3);
+ if (err < 0)
+ goto exit;
+
+ err = isl6423_write(isl6423, reg_4);
+ if (err < 0)
+ goto exit;
+
+ isl6423->reg_3 = reg_3;
+ isl6423->reg_4 = reg_4;
+
+ return 0;
+exit:
+ dprintk(FE_ERROR, 1, "I/O error <%d>", err);
+ return err;
+}
+
+
+static int isl6423_set_voltage(struct dvb_frontend *fe,
+ enum fe_sec_voltage voltage)
+{
+ struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
+ u8 reg_3 = isl6423->reg_3;
+ u8 reg_4 = isl6423->reg_4;
+ int err = 0;
+
+ switch (voltage) {
+ case SEC_VOLTAGE_OFF:
+ /* EN = 0 */
+ reg_4 &= ~(1 << 4);
+ break;
+
+ case SEC_VOLTAGE_13:
+ /* EN = 1, VSPEN = 1, VTOP = 0, VBOT = 0 */
+ reg_4 |= (1 << 4);
+ reg_4 &= ~0x3;
+ reg_3 |= (1 << 3);
+ break;
+
+ case SEC_VOLTAGE_18:
+ /* EN = 1, VSPEN = 1, VTOP = 1, VBOT = 0 */
+ reg_4 |= (1 << 4);
+ reg_4 |= 0x2;
+ reg_4 &= ~0x1;
+ reg_3 |= (1 << 3);
+ break;
+
+ default:
+ break;
+ }
+ err = isl6423_write(isl6423, reg_3);
+ if (err < 0)
+ goto exit;
+
+ err = isl6423_write(isl6423, reg_4);
+ if (err < 0)
+ goto exit;
+
+ isl6423->reg_3 = reg_3;
+ isl6423->reg_4 = reg_4;
+
+ return 0;
+exit:
+ dprintk(FE_ERROR, 1, "I/O error <%d>", err);
+ return err;
+}
+
+static int isl6423_set_current(struct dvb_frontend *fe)
+{
+ struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
+ u8 reg_3 = isl6423->reg_3;
+ const struct isl6423_config *config = isl6423->config;
+ int err = 0;
+
+ switch (config->current_max) {
+ case SEC_CURRENT_275m:
+ /* 275mA */
+ /* ISELH = 0, ISELL = 0 */
+ reg_3 &= ~0x3;
+ break;
+
+ case SEC_CURRENT_515m:
+ /* 515mA */
+ /* ISELH = 0, ISELL = 1 */
+ reg_3 &= ~0x2;
+ reg_3 |= 0x1;
+ break;
+
+ case SEC_CURRENT_635m:
+ /* 635mA */
+ /* ISELH = 1, ISELL = 0 */
+ reg_3 &= ~0x1;
+ reg_3 |= 0x2;
+ break;
+
+ case SEC_CURRENT_800m:
+ /* 800mA */
+ /* ISELH = 1, ISELL = 1 */
+ reg_3 |= 0x3;
+ break;
+ }
+
+ err = isl6423_write(isl6423, reg_3);
+ if (err < 0)
+ goto exit;
+
+ switch (config->curlim) {
+ case SEC_CURRENT_LIM_ON:
+ /* DCL = 0 */
+ reg_3 &= ~0x10;
+ break;
+
+ case SEC_CURRENT_LIM_OFF:
+ /* DCL = 1 */
+ reg_3 |= 0x10;
+ break;
+ }
+
+ err = isl6423_write(isl6423, reg_3);
+ if (err < 0)
+ goto exit;
+
+ isl6423->reg_3 = reg_3;
+
+ return 0;
+exit:
+ dprintk(FE_ERROR, 1, "I/O error <%d>", err);
+ return err;
+}
+
+static void isl6423_release(struct dvb_frontend *fe)
+{
+ isl6423_set_voltage(fe, SEC_VOLTAGE_OFF);
+
+ kfree(fe->sec_priv);
+ fe->sec_priv = NULL;
+}
+
+struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe,
+ struct i2c_adapter *i2c,
+ const struct isl6423_config *config)
+{
+ struct isl6423_dev *isl6423;
+
+ isl6423 = kzalloc(sizeof(struct isl6423_dev), GFP_KERNEL);
+ if (!isl6423)
+ return NULL;
+
+ isl6423->config = config;
+ isl6423->i2c = i2c;
+ fe->sec_priv = isl6423;
+
+ /* SR3H = 0, SR3M = 1, SR3L = 0 */
+ isl6423->reg_3 = 0x02 << 5;
+ /* SR4H = 0, SR4M = 1, SR4L = 1 */
+ isl6423->reg_4 = 0x03 << 5;
+
+ if (isl6423_set_current(fe))
+ goto exit;
+
+ if (isl6423_set_modulation(fe))
+ goto exit;
+
+ fe->ops.release_sec = isl6423_release;
+ fe->ops.set_voltage = isl6423_set_voltage;
+ fe->ops.enable_high_lnb_voltage = isl6423_voltage_boost;
+ isl6423->verbose = verbose;
+
+ return fe;
+
+exit:
+ kfree(isl6423);
+ fe->sec_priv = NULL;
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(isl6423_attach);
+
+MODULE_DESCRIPTION("ISL6423 SEC");
+MODULE_AUTHOR("Manu Abraham");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 06:07:45 +0000