[PATCH v2 06/16] hwmon: (mr75203) fix multi-channel voltage reading

Eliav Farber
2022-08-17T05:44:26Z

- Fix voltage reading to support number of channels in VM IP (CH_NUM).
- Configure the ip-polling register to enable polling for all channels.

Signed-off-by: Eliav Farber <farbere@amazon.com>
---
drivers/hwmon/mr75203.c | 40 +++++++++++++++++++++++++++++++---------
1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index bec63b611eb4..4419e481d47c 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -69,8 +69,9 @@

/* VM Individual Macro Register */
#define VM_COM_REG_SIZE 0x200
-#define VM_SDIF_DONE(n) (VM_COM_REG_SIZE + 0x34 + 0x200 * (n))
-#define VM_SDIF_DATA(n) (VM_COM_REG_SIZE + 0x40 + 0x200 * (n))
+#define VM_SDIF_DONE(vm) (VM_COM_REG_SIZE + 0x34 + 0x200 * (vm))
+#define VM_SDIF_DATA(vm, ch) \
+ (VM_COM_REG_SIZE + 0x40 + 0x200 * (vm) + 0x4 * (ch))

/* SDA Slave Register */
#define IP_CTRL 0x00
@@ -116,6 +117,7 @@ struct pvt_device {
u32 t_num;
u32 p_num;
u32 v_num;
+ u32 c_num;
u32 ip_freq;
u8 *vm_idx;
};
@@ -181,12 +183,14 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
struct regmap *v_map = pvt->v_map;
u32 n, stat;
u8 vm_idx;
+ u8 ch_idx;
int ret;

- if (channel >= pvt->v_num)
+ if (channel >= pvt->v_num * pvt->c_num)
return -EINVAL;

- vm_idx = pvt->vm_idx[channel];
+ vm_idx = pvt->vm_idx[channel / pvt->c_num];
+ ch_idx = channel % pvt->c_num;

switch (attr) {
case hwmon_in_input:
@@ -197,7 +201,7 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
if (ret)
return ret;

- ret = regmap_read(v_map, VM_SDIF_DATA(vm_idx), &n);
+ ret = regmap_read(v_map, VM_SDIF_DATA(vm_idx, ch_idx), &n);
if(ret < 0)
return ret;

@@ -386,6 +390,20 @@ static int pvt_init(struct pvt_device *pvt)
if (ret)
return ret;

+ val = GENMASK(pvt->c_num - 1, 0) | VM_CH_INIT |
+ IP_POLL << SDIF_ADDR_SFT |
+ SDIF_WRN_W | SDIF_PROG;
+ ret = regmap_write(v_map, SDIF_W, val);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
+ val, !(val & SDIF_BUSY),
+ PVT_POLL_DELAY_US,
+ PVT_POLL_TIMEOUT_US);
+ if (ret)
+ return ret;
+
val = CFG1_VOL_MEAS_MODE | CFG1_PARALLEL_OUT |
CFG1_14_BIT | IP_CFG << SDIF_ADDR_SFT |
SDIF_WRN_W | SDIF_PROG;
@@ -501,7 +519,7 @@ static int pvt_reset_control_deassert(struct device *dev, struct pvt_device *pvt
static int mr75203_probe(struct platform_device *pdev)
{
const struct hwmon_channel_info **pvt_info;
- u32 ts_num, vm_num, pd_num, val, index, i;
+ u32 ts_num, vm_num, pd_num, ch_num, val, index, i;
struct device *dev = &pdev->dev;
u32 *temp_config, *in_config;
struct device *hwmon_dev;
@@ -547,9 +565,11 @@ static int mr75203_probe(struct platform_device *pdev)
ts_num = (val & TS_NUM_MSK) >> TS_NUM_SFT;
pd_num = (val & PD_NUM_MSK) >> PD_NUM_SFT;
vm_num = (val & VM_NUM_MSK) >> VM_NUM_SFT;
+ ch_num = (val & CH_NUM_MSK) >> CH_NUM_SFT;
pvt->t_num = ts_num;
pvt->p_num = pd_num;
pvt->v_num = vm_num;
+ pvt->c_num = ch_num;
val = 0;
if (ts_num)
val++;
@@ -586,6 +606,8 @@ static int mr75203_probe(struct platform_device *pdev)
}

if (vm_num) {
+ u32 total_ch = ch_num * vm_num;
+
ret = pvt_get_regmap(pdev, "vm", pvt);
if (ret)
return ret;
@@ -614,13 +636,13 @@ static int mr75203_probe(struct platform_device *pdev)
pvt->v_num = i;
}

- in_config = devm_kcalloc(dev, vm_num + 1,
+ in_config = devm_kcalloc(dev, total_ch + 1,
sizeof(*in_config), GFP_KERNEL);
if (!in_config)
return -ENOMEM;

- memset32(in_config, HWMON_I_INPUT, vm_num);
- in_config[vm_num] = 0;
+ memset32(in_config, HWMON_I_INPUT, total_ch);
+ in_config[total_ch] = 0;
pvt_in.config = in_config;

pvt_info[index++] = &pvt_in;
--
2.37.1